JPH0747203A - Filter - Google Patents

Abstract

PURPOSE:To provide a filter wherein multistage filtration can be performed by arranging a plurality of filter elements with mutually different degree of filtering accuracy in a housing and exchanging of the filter elements can easily be performed. CONSTITUTION:In a filter wherein filter elements 7 are equipped in a filter case 1, an inlet pipe 5 for a liq. to be filtered and a discharging pipe 6 for a filtered liq. are formed respectively on one end and another end of the filter case 1 in such a way that the inlet pipe 5 and the discharging pipe 6 for these liq. are a connecting means between filters each other and two or more filters can be stored in one filter housing. In addition, it is possible to exchange the filter elements without possibility of contamination by providing a check valve in the inlet pipe 5 and/or the discharging pipe 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter suitable for filtering water, liquid such as paint, and gas.

[0002]

2. Description of the Related Art As a filter element for filtering a fluid, there is a cylindrical filter body disclosed in JP-B-56-43139 or JP-B-56-49605.
The size of the filter element is 60-70m outside diameter
m, inner diameter around 30 mm, length 250 mm are standard,
It is used by mounting it in the housing. The finer the filtering accuracy of these filters, the more easily they become clogged and the higher the unit price. As a means to reduce the clogging of the filter with fine filtration accuracy, the coarse to
A multi-stage filtration method in which a medium to fine precision filter is provided for filtration is used. Since multiple filter elements with different filtration accuracy are used in the multi-stage filtration method,
It requires the same number of housings as the number of filter element types, which is excellent for extending the filter life, but it has the problem of significantly increasing the installation space.Therefore, when replacing the filter elements, you must open multiple housings before starting work. There is the complexity of having to do it.

Further, when the naked filter element is directly attached to the housing and used, there is a problem that when the filter element is replaced, the operator is contaminated by the collected and accumulated precipitates or the inside of the housing is contaminated. . In Japanese Utility Model Publication No. 1-37690, a filter cartridge is housed in a filter case, and a check valve urged by a spring is provided at at least one of a liquid inlet and a liquid outlet formed in the filter case. A filtering device is disclosed. According to this device, the above-mentioned problem of contamination can be solved, but in the case of performing multi-stage filtration, a plurality of filter housings must be installed in series, and again there is a problem that a large installation space is required. Remain.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a filter in which a plurality of filter elements having different filtration accuracy are installed in one housing for multi-stage filtration and the filter elements can be easily replaced. Especially.

[0005]

In a filter in which a filter element is installed in a filter case, an inlet pipe for a liquid to be filtered is provided at one end of the filter case, and an outlet pipe for the filtered liquid is provided at the other end. The intended purpose can be achieved by forming the exhaust pipe and the discharge pipe as a connecting means between the filters, and by using a filter in which two or more filters can be housed in one filter housing. It was In addition, the introduction pipe and /
Alternatively, by installing a check valve in the discharge pipe, the filter element can be replaced without risk of contamination. The present invention will be described more specifically with reference to the drawings.

[0006]

[Figure 1]

FIG. 1 is a sectional view showing one embodiment of the filter of the present invention. The filter case (1) comprises an upper lid (2), a body (3) and a lower lid (4), and the upper lid (2)
The lower pipe (4) is provided with an inlet pipe (5) and the lower pipe (4) is provided with a discharge pipe (6). The filter element (7) mounted in the filter case (1) is fitted with a cap (8) at the upper end so that the fluid can flow through the filter element (7).
The inside of the filter element (7) is prevented from directly entering the inside (9), and the lower end is fitted to the inside of the lower lid (4) so that the fluid enters the inside (9) directly from the lower end of the filter element (7). Is preventing things. Therefore, the fluid introduced from the introduction pipe passes through the filter element (7) from the flow path (10) constituted by the gap between the filter case (1) and the filter element (7), and the fluid of the filter element (7) is discharged. It is discharged from the discharge pipe (6) through the inside (9). In order to prevent the fluid from directly entering the inside (9) from the upper and lower end surfaces of the filter element (7), an adhesive is used for the filter element (7) and the cap (8) or the lower lid (4) or heat is applied. Seal by fusion.

The discharge pipe (6) is provided so as to project from the lower lid toward the inside of the filter, and its outer diameter is substantially equal to the inner diameter of the filter element (7). The introduction pipe (5) is provided so as to project upward from the upper lid (2), and its outer diameter is substantially equal to the inner diameter of the discharge pipe (6). Here, “substantially equal” means that the outer diameter of the introduction pipe can be inserted into the discharge pipe, and the boundary surface between the two is in close contact with the fluid so that the fluid does not pass therethrough. If the material that makes up each member is rich in elasticity, it is possible to insert even an introduction pipe with an outer diameter larger than the inner diameter of the discharge pipe, and when installing rubber packing on the boundary surface, it is better than the inner diameter of the discharge pipe. It is also possible to use a small outside diameter inlet tube.

[0009]

[Fig. 2]

FIG. 2 is a sectional view showing a state in which the two filters shown in FIG. 1 are housed in one housing. The housing comprises an upper lid (11) and a body (12). The upper lid (11) is provided with a liquid guide pipe (13), and the body (12) is provided with a drainage pipe (14). Normally, a valve (not shown) is provided in each of the liquid guide pipe (13) and the drain pipe (14). The introduction pipe (5) of the filter is in close contact with the inner surface of the liquid guiding pipe (13) of the housing, and the drain pipe (14) of the housing is in close contact with the inner surface of the discharge pipe (6) of the filter. The filter is housed in close contact with the inner surface of the housing so that the filter is not destroyed by the pressure of the liquid to be filtered. The liquid to be filtered permeates from the outside to the inside of the filter element (A ′) of the upstream filter (A) according to the path indicated by the arrow, and then flows into the filter element (B ′) of the downstream filter (B). Permeates from the outside to the inside and is discharged. In FIG. 2, the upstream filter (A) and the downstream filter (B) are joined in a sleeve type.
Here, by using a filter element (A ') of the upstream side filter (A), which has a coarser filtration accuracy than the filter element (B') of the downstream side filter (B), in one housing Multistage filtration can be performed.

[0011]

[Figure 3]

FIG. 3 is a cross-sectional view showing an embodiment in which the check valve (15, 16) is provided in the introduction pipe (5) and the discharge pipe (6) in the filter of the present invention.

[0013]

[Figure 4]

FIG. 4 is a sectional view showing a state in which the two filters shown in FIG. 3 are housed in one housing. In FIG. 3, the check valve (15) provided inside the introducing pipe (5) of the filter closes the introducing pipe by the rigidity of the material itself or an appropriate spring material. In FIG. 4, the check valve (15) is unblocked by the inflow pressure of the liquid to be filtered, but returns to the original closed state when the inflow of the liquid is stopped. Due to such an action, it is possible to prevent the housing and the working environment from being contaminated by the mud-like substances collected in the filter case. The check valve (16) provided inside the discharge pipe (6) in FIG. 3 closes the introduction pipe by the rigidity of the material itself or an appropriate spring material, but in FIG. (5) and the projections (17, 17 ') provided on the discharge pipe (14) of the housing release the blockage. When the filtering operation is completed and the filters are taken out of the housing, or when the filters are cut off from each other, the original closed state is restored. By such an action, it is possible to prevent the housing and the working environment from being contaminated by the liquid remaining in the filter when the filter is replaced.

[0015]

EXAMPLES The present invention will be described in more detail by way of examples. The filtration performance test used in the examples was based on the following method. [Filtration Accuracy] Circulating water is passed through the filter from a 30-liter water tank at a flow rate of 30 liters per minute. 0.5 g of cakes (7 types of JIS Z8901 test dust: Kanto loam, average particle size 29 μm) are put into a water tank, and the filtrate after 1 minute is collected. The particle size of the particles flowing out into the filtrate is measured with a particle size distribution measuring device, and the maximum particle size is taken as the filtration accuracy. [Filtration Life] Circulating water is passed through the filter from a 30-liter water tank at a flow rate of 30 liters per minute. 0.5 g of cake (7 types of JIS Z8901 test dust: Kanto loam, average particle size 29 μm) was added into the water tank at a rate of 0.5 g / min, and the time until the pressure difference between the inlet and the outlet of the filter reached 3 kg / cm ² was filtered. Let life.

Example 1 A composite fiber web of polyethylene having a sheath component and polypropylene having a core component and having a fiber diameter of 50 μm was wound up while being heated to about 140 ° C. to form a cylindrical shape having an outer diameter of 65 mm, an inner diameter of 30 mm and a length of 240 mm. A filter element (A) was obtained. A polyethylene cap having a diameter of 65 mm and a thickness of 1 mm was heat-welded to the upper end of the filter element (A) and then stored in a filter case having an outer diameter of 80 mm and a length of 270 mm. The lower end of the filter element (A) was heat-welded to the lower lid of the filter case. An introduction pipe having an outer diameter of 21 mm and a length of 20 mm projects from the center of the upper lid of the filter case, and a rubber check valve is provided inside the upper lid.
A discharge pipe having an inner diameter of 25 mm and a length of 20 mm projects toward the inside of the filter case at the center of the lower lid of the filter case. Thus, the filter (A) was obtained.
A cylindrical filter element (B) having an outer diameter of 65 mm, an inner diameter of 30 mm, and a length of 240 mm is obtained by winding a composite fiber web of polyethylene having a sheath component and polypropylene having a core component and having a fiber diameter of 20 μm while heating at about 140 ° C. Got This filter element (B) is stored in the filter case like the filter element (A),
A filter (B) was obtained.

One filter was installed with the filter (B) on the downstream side and the filter (A) on the upstream side in one housing capable of accommodating two standard size filters. Liquid leaks were prevented by using rubber O-rings at the connecting portions between the housing and the filter and between the filter and the filter. The filter thus assembled has a filtration accuracy of 20 μm and a filtration life of 110.
It was a minute. At this time, the housing installation space is about 8.
It was 5 liters, there was no environmental pollution due to the cake collected when the housing was opened and the filter was replaced, and the replacement time could be shortened to about 1/3 that of the conventional multistage filtration method.

Example 2 A composite fiber web having a sheath component of polyethylene and a core component of polypropylene and having a fiber diameter of 50 μm is wound up while being heated to about 140 ° C. to form a cylindrical shape having an outer diameter of 65 mm, an inner diameter of 30 mm and a length of 140 mm. The filter element (C) was obtained. A polyethylene cap having a diameter of 65 mm and a thickness of 1 mm was heat-welded to the upper end of the filter element (C) and then stored in a filter case having an outer diameter of 80 mm and a length of 170 mm. The lower end of the filter element (C) was heat-welded to the lower lid of the filter case. A screw was cut on the outside of the introduction tube having an outer diameter of 21 mm and a length of 20 mm protruding in the center of the upper lid of the filter case. A rubber check valve is provided inside the upper lid. Inner diameter of 25m protruding toward the inside of the filter case at the center of the lower lid of the filter case
The inside of the discharge pipe having a length of m and a length of 20 mm was cut with a screw suitable for the introduction pipe. Thus, the filter (C) was obtained.

A cylindrical filter element having an outer diameter of 65 mm, an inner diameter of 30 mm and a length of 340 mm is obtained by winding a composite fiber web having a sheath diameter of polyethylene and a core component of polypropylene and having a fiber diameter of 20 μm while heating at about 140 ° C. (D) was obtained. This filter element (D) was stored in the same manner as the filter element (C) except that the filter element (D) was housed in a filter case having a length of 370 mm and a rubber check valve provided in the discharge pipe to obtain a filter (D). After connecting the introduction pipe of the filter (D) to the discharge pipe of the filter (C) with a screw, it was attached to a housing capable of storing two standard size filters. A rubber O-ring was used at each of the connecting portions between the housing and the filter to prevent liquid leakage. The filter thus assembled had a filtration accuracy of 21 μm and a filtration life of 123 minutes.
The installation space of the housing at this time is about 8.5 liters, there is no environmental pollution due to the collected cake or filtrate when the housing is opened and the filter is replaced, and the replacement time is about 1/3 that of the conventional multistage filtration method. I was able to shorten it.

Example 3 A composite fiber web having a sheath component of polyethylene and a core component of polypropylene and having a fiber diameter of 75 μm is wound up while being heated to about 140 ° C. to form a cylindrical shape having an outer diameter of 65 mm, an inner diameter of 30 mm and a length of 90 mm. A filter element (E) was obtained. This is the same as in Example 1, except that the length is 120 m.
The filter (E) was obtained by storing in a filter case of m. A composite fiber web with a sheath diameter of polyethylene and polypropylene as the core component and a fiber diameter of 50 μm is about 140 ° C.
Rolled while heating to 65mm outer diameter, 30m inner diameter
A cylindrical filter element (F) having a length of m and a length of 140 mm was obtained. This was carried out in the same manner as in Example 1, except that the filter (F) was obtained by storing it in a filter case having a length of 170 mm.

A composite fiber web having a sheath diameter of polyethylene and a core component of polypropylene and having a fiber diameter of 20 μm is wound up while being heated to about 140 ° C., and is a cylindrical filter element having an outer diameter of 65 mm, an inner diameter of 30 mm and a length of 240 mm. (G) was obtained. This was carried out in the same manner as in Example 1, except that the filter was stored in a filter case having a length of 270 mm to obtain a filter (G). The filter (E), the filter (F), and the filter (G) were connected in this order from the upstream side, and attached to a housing capable of accommodating two standard size filters. Liquid leaks were prevented by using rubber O-rings at the connecting portions between the filters and between the housing and the filter. The filter thus assembled had a filtration accuracy of 21 μm and a filtration life of 125 minutes. The installation space of the housing at this time is about 8.5.
Since it is a liter, there is no environmental pollution due to the collected cake when the housing is opened and the filter is replaced, and the replacement time can be shortened to about 1/3 that of the conventional multistage filtration method.

Comparative Example 1 Housing 1 that can store two standard size filters
Two filter elements (B) made in Example 1 were mounted in the base. The filter thus assembled had a filtration accuracy of 20 μm and a filtration life of 70 minutes. The installation space of the housing at this time was about 8.5 liters, but when the housing was opened and the filter was replaced, environmental pollution was caused by the cake collected, and the replacement time including the cleaning operation was the same as in Example 1. It took twice as much.

Comparative Example 2 One filter element (A) and one filter element (B) made in Example 1 were mounted in a housing capable of accommodating one standard size filter. With the housing containing the filter element (A) on the upstream side, these two housings were connected to perform multistage filtration. As a result, the filtration accuracy was 21 μm and the filtration life was 111 minutes. The installation space of the housing at this time was about 12 liters, which was about 1.4 times that in the case of Example 1. Further, when the housing is opened and the filter is replaced, environmental pollution due to the collected cake occurs, and since two housings are handled, the replacement time was three times that of Example 1.

[0024]

According to the filter of the present invention, the liquid introduction pipe and the discharge pipe provided in the filter case having the filter element incorporated therein are formed so as to connect the filters to each other, and one filter housing is provided. It is short enough to hold more than one filter inside. Therefore, multi-stage filtration is possible within one filter housing, and the installation area of the filter is small. Further, since the filter element is housed in the filter case, environmental pollution at the time of filter replacement can be prevented.

[0025]

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a filter of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the two filters of FIG. 1 are stored in a standard size housing.

FIG. 3 is a sectional view showing another embodiment of the filter of the present invention having a check valve in the filter case.

FIG. 4 is a cross-sectional view showing a state in which two filters of FIG. 3 are stored in a standard size housing.

[Explanation of symbols]

 1: Filter Case 2: Upper Lid 3: Body 4: Lower Lid 5: Inlet Pipe 6: Discharge Pipe 7: Filter Element 8: Cap 9: Inside 10: Flow Path 11: Housing Upper Lid 12: Housing Body 13: Liquid Transfer Pipe 14: Drainage pipe 16: Check valve 17, 17 ': Protrusion

Claims (5)

[Claims] 1. A filter in which a filter element is provided in a filter case having an inlet pipe for liquid to be filtered at one end and an outlet pipe for filtered liquid at the other end, the inlet pipe and the outlet pipe for these liquids. Is formed so as to serve as a connecting means between filters, and two or more filters can be stored in one filter housing. 2. The filter according to claim 1, wherein the introduction pipe and / or the discharge pipe is provided with a check valve. 3. The filter according to claim 1, wherein a connecting portion between the introduction pipe and the discharge pipe is provided in a sleeve type. 4. The filter according to claim 1, wherein the connection portion between the introduction pipe and the discharge pipe is provided in a screwed type. 5. The filter according to claim 1, wherein the connection portion between the introduction pipe and the discharge pipe is provided so as to be sealed with an O-ring.