CN1338968A - Oil filter assembly for industrial applications - Google Patents

Abstract

Disclosed are an oil filter assembly for industrial applications and its manufacturing method. The oil filter assembly is characterized in that a filter body has a circumferential protrusion portion (23a) projected circumferentially at a portion thereof, the circumferential protrusion portion (23a) being compressed when the oil filter assembly for industrial applications is inserted into the housing (1) and ensuring the complete sealing between the housing (1) and the filter body, thereby preventing the seeping of the unfiltered oil through a clearance (5d) between the housing (1) and the filter body and preventing foreign particulates collected near the circumferential end of the upper surface of the filter body inside of the housing (1) from flowing into the housing (1) along, and contaminating, the inner wall surface of the housing (1) when the oil filter assembly (10) is pulled out from the housing (1) for being replaced with a new one.

Description

Oil filter assemblies for industrial equipment

technical field

The present invention relates generally to oil filter assemblies for use on industrial equipment, and the present invention particularly relates to such filter assemblies that can effectively remove oil impurities such as moisture, solid particles from oil, and prevent oil from It is filtered and bypassed, so the filtration efficiency is obviously improved, and the service life of the oil filter assembly is extended, and the assembly is easy to update and maintain.

Background Art of the Invention

The Korean Utility Model No. 97-8238 publication on March 27, 1997 and the Korean Utility Model No. 95-20987 application submitted by the applicant on August 16, 1995 disclose an oil filter assembly as an existing Technology Winding drum shaped oil filter assembly, with reference to Figures 1 to 3b, such an oil filter assembly is briefly explained below. Referring first to Fig. 1, the oil filter assembly 10 includes: an inner pipe 12 and an outer pipe 11; an upper filter body 13 and a lower filter body 15 are firmly inserted between the inner pipe 12 and the outer pipe 11; the dehumidification filter layer 14 , 16 are interposed between the upper filter body 13 and the lower filter element 15 and attached to the bottom surface of the lower filter body 15 .

For example, the upper filter body 13 and the lower filter body 15 are formed from strips of natural pulp material wound around a drum. In particular, the dehumidification filter layers 14, 16 are made of woven or non-woven fabric, compressed cotton, etc., to remove moisture from the filtered oil. Also, the outer tube 11 and the inner tube 12 may be formed of a hard substance such as hardboard.

In FIG. 2, a prior art oil filter assembly 10 having the above-mentioned structure is inserted into a housing 1, and then, a cover 2 is engaged with the housing 1 in an oil-tight manner using a fixing rod 3 having oil passages 3a and 3b. open end. Therefore, the housing 1 is installed on the filter device or industrial equipment, and the inlet pipe 100 and the outlet pipe 200 of the filter device or industrial equipment are respectively connected to the oil inlet 3c and the discharge port 1b of the housing 1 in an oil-tight manner.

When the housing 1 in which the oil filter assembly 10 is inserted is installed in a filter device or industrial equipment, the oil is passed from the inlet pipe 100 through the oil passages 3a and 3b by means of the hydraulic pressure of a pressure source such as a pump (not shown) and located at The annular channel 5a between the inner tube 12 and the fixed rod 3 flows into the upper space 5b. The oil in the upper space 5b flows down through the filter media sequentially along the upper filter body 13, the dehumidification filter layer 14, the lower filter body 15, and the dehumidification filter layer 16, so impurities contained in the oil are eliminated. collect them. Especially when the oil passes through the dehumidification filter layers 14, 16, moisture is removed from the oil. Then, the filtered oil is collected in the lower space 5 c and flows out through the outlet pipe 200 .

In FIG. 2 , since the outer tube 11 is made of a hard material such as hardboard, it is very difficult to achieve a complete seal between the outer tube 11 and the inner wall surface of the housing 1 . Therefore, unfiltered oil leaks from the upper space 5b into the lower space 5c through the gap 5d between the outer tube 11 and the inner wall surface of the housing 1, so that the filtering efficiency is lowered. And, on the upper surface of the upper filter body 13, particles in the oil are collected from the circumference to the inside, because the area of the upper surface of the upper filter body 13 becomes smaller, thereby increasing the oil pressure in the upper space 5b. The increased pressure creates cracks 13a in the upper filter body 13 before the useful life of the filter body, as shown in Figure 3b. The cracks 13a grow larger along the grain of the upper filter body 13, and these particles pass through the cracks 13b, thereby suddenly reducing the filtration efficiency and shortening the service life of the oil filter assembly 10 and the oil.

In addition, the oil needs to be heated to raise the oil temperature during the colder winter months and cooled to lower the oil temperature during the hot summer months. The temperature difference between the interior and exterior of the lubrication system forms condensation, so that a large amount of moisture is contained in the oil by means of the internal condensation. In particular, the above-described oil filter assembly 10 having the upper filter body 13 and the lower filter body 15 formed of sheets of natural slurry material in a wound-on-drum manner is extremely resistant to moisture in terms of its structure and characteristics. Not durable, so the aforementioned problems are exacerbated in this construction.

In Fig. 3a and Fig. 3b, the upper filter body 13 and the lower filter body 15 are wound with the same density, and the oil passes through the dehumidification filter layer 14 from the upper filter body 13 toward the lower filter body 15, without Stay in the dehumidification filter layer 14 for a long time. Moisture cannot thus be sufficiently removed, and the service life of the oil filter assembly 10 and the oil is further shortened.

In addition, it is very inconvenient to renew the oil filter assembly 10 because the oil filter assembly 10 is firmly inserted into the housing 1, so the housing 1 has to be turned upside down to take out the oil filter assembly 10 therefrom.

And, in addition to the leakage of unfiltered oil through the gap 5d, when the oil filter assembly 10 is pulled out from the housing 1 to replace it with a new one, it collects near the upper surface circumferential end of the upper filter body 13 inside the outer tube 11 The impurity particles flow into the housing 1 along the inner wall surface of the housing 1 and pollute the inner wall surface of the housing 1 .

Summary of the invention

The present invention overcomes the above-mentioned problems of the prior art, and accordingly the main object of the present invention is to provide an oil filter assembly for industrial equipment, which can effectively remove oil impurities such as moisture, solid particles, and prevent the oil from bypassing without being filtered, and prevent the inner wall surface of the housing from being polluted, so the filtration efficiency is obviously improved, and the service life of the oil filter assembly is extended, and it is easy to update and maintain the assembly.

Furthermore, another object of the present invention is to provide a method of manufacturing such a new and improved oil filter assembly.

In order to achieve the above object, the present invention provides an oil filter assembly for industrial equipment, the filter assembly is inserted into the housing, and includes: an inner tube; an outer tube; a multi-layer filter body, these filter bodies are inserted into Between the inner pipe and the outer pipe, thereby filtering foreign substances from the oil by passing through the filter body; and at least one dehumidification filter layer, which is inserted between the multi-layer filter bodies, the improvement is characterized in that the filter bodies between which dehumidification filter layers are inserted, the density of the upper filter body located on the upstream side of the dehumidification filter layers is smaller than the density of the lower filter body located on the downstream side of the dehumidification filter layers, thereby The dehumidification filter layer stays longer and adequately removes water or moisture from the oil.

Furthermore, the present invention provides a method of manufacturing an oil filter assembly comprising: an outer tube; an upper filter body and a lower filter body inserted into the outer tube; a first inner tube; and The second upper inner pipe and the second lower inner pipe, while the first inner pipe is firmly inserted into them, and a filter medium such as a band of natural slurry material is wound around each of them, thereby each forming a drum-shaped upper A filter body and a lower filter body, the method comprising the steps of:

winding the filter media of the natural slurry band into the second upper inner tube and the second lower inner tube, thereby forming an upper filter body and a lower filter body, respectively; and

The upper filter body and the lower filter body are quasi-assembled by the first inner tube by inserting the second upper inner tube and the second lower inner tube firmly into the upper and lower parts of the first inner tube respectively, thereby forming Multilayer upper and lower filter bodies.

These and other objects, advantages and features will become apparent to those skilled in the art from the following description of the preferred embodiment of the present invention, especially when considered in conjunction with the accompanying drawings, in which , like numbers in these views denote like parts.

Brief description of the drawings

Figure 1 is a longitudinal sectional view of a prior art oil filter assembly;

Figure 2 is a longitudinal sectional view of a housing assembly in which the oil filter assembly of Figure 1 is installed;

Figure 3a is an enlarged partial cross-sectional view of the oil filter assembly of Figure 1 illustrating a problem in the filtration of moisture as it passes through the desiccant filter layer;

Fig. 3b is a plan view of the oil filter assembly of Fig. 1, which explains other problems of shortened service life;

4 is a longitudinal sectional view of an oil filter assembly according to an embodiment of the present invention;

Figure 5 is a longitudinal sectional view of a housing assembly in which the oil filter assembly of Figure 4 is installed;

Figure 6 is an enlarged partial cross-sectional view of the oil filter assembly of Figure 4 illustrating a feature of the present invention in the filtration of moisture as it passes through the desiccant filter layer; and

7-11 illustrate various steps in manufacturing the oil filter assembly of FIG. 4 .

Detailed description of the preferred embodiment

The invention will now be described by way of example with reference to the accompanying drawings.

Figure 4 illustrates an oil filter assembly 20 in accordance with one embodiment of the present invention. In Fig. 4, the oil filter assembly 20 includes an outer tube 21, a first inner tube 22, a second upper inner tube 22a, a second lower inner tube 22b, an upper filter body 23, a lower filter body 25, an intermediate dehumidification filter Filter layer 24 and lower dehumidification filter layer 26. The upper filter body 23 , the lower filter body 25 , the middle dehumidification filter layer 24 and the lower dehumidification filter layer 26 comprise multilayer filter elements formed of filter media such as natural slurry or the like.

As shown in FIG. 7, the upper filter body 23 is formed into a drum shape by winding a belt-shaped filter medium such as a natural slurry belt on the second upper inner pipe 22a at a relatively small density. In addition, the lower filter body 25 is formed into a drum shape by winding a filter medium of a belt-like structure such as a natural slurry belt on the second lower inner pipe 22b at a relatively large density. That is, when forming the lower filter body 25 , the tension of winding the tape is higher than that of forming the upper filter body 23 , so the lower filter body 25 is wound more times.

In FIG. 4 , the middle dehumidification filter layer 24 is interposed between the upper filter body 23 and the lower filter body 25 , and the lower dehumidification filter layer 26 is provided in contact with the lower surface of the lower filter body 25 . In particular, these dehumidification filter layers 24 and 26 are formed of filter media such as woven or non-woven fabrics, compressed cotton, etc., to remove moisture from oil, and are assembled by simply placing a circular sheet having holes Shaped filter media are inserted into the lower ends of the second upper and lower tubes 22a and 22b of each wound filter belt, as shown in FIG. 8 .

The upper filter body 23 has a circumferential protrusion 23 a protruding in the circumferential direction on the outer side of the upper circumferential wall portion of the outer diameter of the upper filter body 23 . When the oil filter assembly for industrial equipment is inserted into the housing 1, the circumferential protrusion 23a is compressed by the inner wall of the housing 1, and a complete seal between the housing 1 and the oil filter assembly 20 is ensured, as Figure 5 shows. Therefore, unfiltered oil can be prevented from leaking through the gap 5d between the housing 1 and the upper filter body 23 .

In addition, when the oil filter assembly 10 is pulled out from the housing 1 to replace it with a new one, foreign particles collected near the circumferential end of the upper surface inside the filter body of the housing 1 can be prevented from running along the inner wall of the housing 1. The surface flows into the housing 1 and the inner wall surface of the housing 1 is prevented from being polluted.

The circumferential protrusion 23a can be formed by means of the following method: the quasi-assembled upper and lower filter bodies are inserted into the outer tube 21, which is shorter than the entire height of the upper filter body 23 and the lower filter body 25 , as described later with respect to FIG. 11 .

In addition, the present invention includes a strap 27, which makes maintenance and replacement of the oil filter assembly easier, said strap 27 being firmly inserted between the first inner tube 22 and the second upper inner tube 22a and the second lower inner tube 22b. Between the outer pipe 21 and the upper filter body 23 and the lower filter body 25, as shown in FIG. 4 . The belt 27 can be covered by a belt-shaped covering 28 so that it can be prevented from dangling and getting dirty. Preferably, the strap 27 is inserted with a thin non-woven fabric 28a, so it can be held firmly. In addition, the thin non-woven fabric 28a maintains a more complete sealing condition between the first inner tube 22 and the second upper inner tube 22a and the second lower inner tube 22b.

Instead of the above stabilizing belt fixing structure, a belt 27 may be inserted between the first inner tube 22 and the second upper inner tube 22 a and between the outer tube 21 and the upper filter body 23 .

Referring to FIGS. 6 to 11 , a method of manufacturing an oil filter assembly according to an embodiment of the present invention is described below.

In FIG. 7, the filter medium of the natural slurry belt is wound around the second upper inner tube 22a and the second lower inner tube 22b, thereby forming a drum-shaped upper filter body 23 and a lower filter body 25, respectively. When forming the lower filter body 25, the pressure when winding the belt is higher than when forming the upper filter body 23, therefore, in the lower filter body 25, the number of winding turns and the density of the filter medium are greater.

In FIG. 8, just after the winding step, the dehumidification filter medium is inserted around the second upper inner tube 22a and the second lower inner tube 22b so as to be in contact with each of the upper filter body 23 and the lower filter body 25, respectively. The two bottom surfaces come into contact, thus forming the desiccant filter layers 24,26.

Then, as shown in FIG. 9, the maintenance belt 27 is inserted into the second upper inner tube 22a and the second lower inner tube 22b, and the first inner tube 22 is inserted into the second upper part in a press-fit manner through the nonwoven fabric 28a. In the inner tube 22 a and the second lower inner tube 22 b , thus the upper filter body 23 and the lower filter body 25 are quasi-assembled by means of the first inner tube 22 .

In FIG. 10, the strap 27 is secured to the outer edges of the upper filter body 23 and the lower filter body 25, preferably by means of staplers 29. In FIG.

Afterwards, a strip-shaped covering plate 28 larger than the inner diameter of the outer tube 21 is placed between the outer tube 21 and the quasi-assembled upper and lower filter bodies, as shown in FIG. 11 . Then, by means of lateral compression means 31 such as a plurality of clamping plates and a pneumatic cylinder or a hydraulic cylinder not shown, the upper and lower filter bodies of the quasi-assembly are compressed horizontally, thereby reducing the outer diameters of the upper and lower filter bodies of the quasi-assembly, So that the quasi-fitted upper and lower filter bodies can be inserted into the outer tube 21 . While maintaining the horizontal compression step, the quasi-assembled upper and lower filter bodies are inserted into the outer tube 21 with the band-shaped covering 28 by means of an upper compression tool 32 and a pneumatic or hydraulic cylinder not shown The ready-to-assemble upper and lower filter bodies are pressed vertically against the base 30 .

In the vertical compression and insertion step, the circumferential protrusion 23a is formed by means of the following method: the quasi-assembled upper and lower filter bodies are inserted into the outer tube 21, and the tube 21 is shorter than the upper filter body 23 and the lower filter body. The whole height of body 25. That is, the upper end portion of the upper filter body 23 located above the upper end of the outer tube 21 protrudes over the entire periphery.

Therefore, according to a method of the present invention, the oil filter assembly 20 can be simply manufactured and assembled.

Hereinafter, features of the above-described oil filter assembly 20 are described with reference to FIGS. 5 to 6 .

In FIG. 5, when the oil filter assembly 20 is inserted into the housing 1, there is no gap between the inner wall surface of the housing 1 and the improved circumferential protrusion 23a, thus ensuring a gap between the housing 1 and the filter body. completely sealed. Therefore, it is possible to prevent unfiltered oil from leaking between the inner wall surface of the housing 1 and the filter body, and all the oil is filtered through the entire cross-sectional area of the upper and lower filter bodies 23 and 25, while Only a few foreign particles are collected near the circumferential end of the upper surface inside the upper filter body 23 of the housing 1, so the filtration efficiency is improved. In addition, even a small amount of collected foreign particles will not contaminate the inner wall surface of the housing 1, because when the oil filter assembly 20 is taken out of the housing 1, the inner surface of the housing 1 is washed by means of the circumferential protrusion 23a. , so the collected impurity particles basically do not flow along the inner surface of the casing 1 .

In Fig. 6, since the density of the upper filter body 23 is smaller than that of the lower filter body 25, the oil filtered by the upper filter body 23 flows into the lower filter body 25 at a reduced flow rate, and along the radial direction And/or distributed on the dehumidification filter layer 24 in the circumferential direction, so that water or moisture can be completely removed from the oil, and the filtration efficiency is further improved. After passing through the dehumidification filter layer 24, even if the upper filter body 23 is damaged by moisture and the impurity particles pass through the upper filter body 23 to the lower filter body 25, the impurity particles pass through the high-density lower filter body 25 from the oil The medium is completely filtered out, so the time for the entire oil filter assembly 20 to be completely damaged or broken is prolonged, and the service life is greatly improved.

In addition, the oil filter assembly 20 has a belt 27 of less costly construction, thus facilitating maintenance and replacement of the oil filter assembly.

As described above, the two filter body layer oil filter assembly 20 of the present invention and its method of manufacture are disclosed by way of example only, but this does not limit the present invention.

Those of ordinary skill in the art clearly know that these solutions can be changed or applied within the scope of the spirit of the present invention, and are not limited to the above-mentioned aspects of the present invention.

Example.

Claims (4)

1. oil filter assembly that is used for industrial equipment, this filter assemblies is inserted in the housing, and comprises: interior pipe; Outer tube; Multiple filtration body, these filter bodies are inserted between interior pipe and the outer tube, thereby by means of by filter body foreign matter being filtered out from oil; And at least one dehumidifying filter layer, it is inserted between the multiple filtration body, the improved filter body that is characterised in that, between these filter bodies, inserted the dehumidifying filter layer, the density of top filter body of upstream side that is positioned at the dehumidifying filter layer is less than the density of lower filter body in the downstream that is positioned at the dehumidifying filter layer, thereby stop the longer time at the dehumidifying filter layer, and from oil, remove fully and anhydrate or moisture.

2. oil filter assembly as claimed in claim 1, wherein interior pipe comprises in first in the pipe and second top manages in the pipe and second bottom, pipe firmly is inserted in them in first, and twining filter media such as natural paste materials band, thereby the top filter body of each self-forming drum-shape and lower filter body around in them each;

The top filter body has the circumference protuberance, this protuberance is along the circumferential direction stretched in its part, when oil filter assembly is inserted into housing, the circumference protuberance is compressed and guarantees sealing fully between housing and the top filter body, therefore prevented that unfiltered oil from carrying out seepage by the gap between housing and the filter body, and pull out from housing when more renewing when oil filter assembly, near the impurity particle that has prevented to be collected in the upper surface circumferential end of filter body inside of housing flows in the housing and pollutes the inner wall surface of this housing along the inner wall surface of housing; And

Described oil filter assembly also comprises band, and this band is more prone to the maintenance of oil filter assembly and replacing, described band firmly be inserted into manage in the pipe and second top in first and second bottom between in the pipe at least one.

3. method of making oil filter assembly, this filter assemblies comprises: outer tube; Top filter body and lower filter body, these filter bodies insert in the outer tube; Pipe in first; And manage in pipe and second bottom in second top, and pipe stably inserts in them in first, and twining filter media such as natural paste materials band around in them each, thereby the top filter body of each self-forming drum-shape and lower filter body, described method comprises these steps:

The filter media of natural slurry band is wound in second top in the pipe and second bottom in the pipe, thus each self-forming top filter body and lower filter body; And

In first, manage standard assembling top filter body and lower filter body by means of following mode: pipe in the pipe and second bottom in second top stably is inserted in the upper and lower of the first interior pipe separately, thus the top filter body and the lower filter body of formation multilayer.

4. method as claimed in claim 3, it also comprises these steps:

Just after winding step, the dehumidifying filter media be inserted on second the top in pipe in the pipe and second bottom around, thereby contact with each basal surface formation of top filter body and lower filter body separately, thereby formed the dehumidifying filter layer;

Before accurate installation step, safeguarding that band is inserted in second top in the pipe and second bottom at least one in the pipe, thereby after accurate installation step, safeguarding that band is fixed in second top in the pipe and second bottom between at least one in the pipe and the first interior pipe;

Banded cladding plate greater than outer tube diameter is placed between outer tube and the accurate upper and lower filter body that assembles up, and this band shape cladding plate has prevented to safeguard that band dangles with dirty;

The accurate upper and lower filter body that assembles up of level compression, thereby the external diameter of the accurate upper and lower filter body that assembles up of minimizing;

When keeping horizontal compression step, the upper and lower filter body that standard assembles up is inserted in the outer tube by means of vertical compression; And

In the inserting step of the upper and lower filter body that standard assembles up, form the circumference protuberance by means of following method: the upper and lower filter body that standard is assembled up is inserted in the outer tube, and this pipe is shorter than the whole height of top filter body and lower filter body, and the upper end of top filter body is stretched out in the upper end of outer tube.

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