JPS6372312A - Filter element - Google Patents

Abstract

PURPOSE:To increase filter efficiency, by bonding faces located on the inner sides of both ends of filter elements of crimps each other. CONSTITUTION:A number of crimps 4 are formed by folding a sheet-shaped filter paper, and sealing sections 5 are also formed by bonding faces each other located on the inner sides of elements 3 of crimps 4 at both ends of filter elements 3 formed by rolling the sheet-shaped filter paper in the form of a cylinder. As a result, fluid to be filtered flows in the axial direction from one edge face to the other edge face of the element 3 in a constant flow velocity, and in said flow in the axial direction, the fluid to be filtered flows through from the outer side into the inner side of the element 3 and filtered. By said process, the pressure loss less than that of conventional elements, in which fluid to be filtered flows from the outer edge side into the inner edge side, can be provided, and uniform filtration at each section of the filter element 3 can be carried out by the constant flow to increase filter efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a filter element, and particularly to a filter element used in an oil filter for an internal combustion engine or a line filter for hydraulic piping.

(Prior Art) Oil filters for internal combustion engines and line filters for hydraulic piping are used to remove dust mixed in circulating oil.

The filter usually has a structure in which a cartridge-shaped filter element formed by folding paper is housed in an airtight container made of metal.

As shown in FIG. 5, a conventional oil filter 20 is composed of a filter element 22 housed in an oil filter case 21, a bottom cover 24 that supports the filter element 22, and a reinforcing inner cylinder 25 for the element. ing.

The filter element 22 is shown in FIGS.
(The figure is a perspective view, and Figure 7 is a plan view.) As shown in Fig. 7, it is made of folded paper folded into a mountain shape or rolled into a cylindrical shape with a chrysanthemum-shaped cross section. The parts are sealed and bonded with iron plates 23a and 23b.

The above-mentioned plates 23a and 23b are formed into a plate shape by press working, and then an adhesive is applied to the internal joint portions, and the plates are joined to both ends of the filter element 22.

5, the overflow of the oil filter having the filter element constructed as described above is shown in FIG. The oil sucked in flows into the oil filter case 21 via the check valve 26 as shown by the arrow. Then, the oil flows from the outer end of the filter element 21 toward the inner end, passes through the filter element 22, and flows into the center of the oil filter case 21. At this time, clean oil from which dust has been removed by being filtered by the filter element 22 is sent to the lubrication process from the oil outlet 21 at the bottom of the oil filter.

(Problems to be Solved by the Invention) However, in the filter element which is formed in the shape of a chrysanthemum as described above and has plates attached to both ends thereof, as shown by the arrows in FIG. 5 and FIG. Since the filtered fluid can only flow in from the side of the element, as the filtered fluid enters from the outer end of the element to the inner end, it is gradually narrowed down and the flow path area decreases.
The flow rate of the Jtt filtration fluid is gradually increased, and conversely, the pressure of the fluid to be filtered continues to decrease, that is, the flow path resistance increases,
There is a problem in that the pressure loss of the fluid to be filtered increases.

Moreover, since the flow velocity in each part of the element is not uniform,
There is a problem in that the resistance of the flow path between the element and the paper is not uniform, and the flow velocity passing through the paper is different in some parts, making it impossible to achieve uniform filtration.

In addition, in the filter element formed in the chrysanthemum shape as described above, the chevron-shaped folds are formed radially from the center, as shown in the plan view in FIG.
The interval W between the pleats formed on the outer end side increases as the diameter of the outer cylinder of the filter element increases. Therefore, there is a problem that a large number of pleats cannot be formed and a large filtration area cannot be obtained. Also, if you try to increase the filtration area by reducing the diameter of the inner cylinder of the filter element, the folds formed on the inner end side will interfere with each other, making it impossible to increase the number of folds in the filter paper. It is not possible to increase the amount of

Furthermore, since both ends of the filter element are covered with plates, the fluid to be filtered that flows in from below the oil filter once collides with the plate, detours around, flows to the side of the element, and then flows outside the element. Since the fluid has a poor flow path in which it flows from the end side to the inner end side, there is a problem that the flow path is long and the fluid does not flow smoothly. Moreover, there is a problem that fJm of the filter element increases due to the plates at both ends.

The present invention was devised in view of the above circumstances, and its zero objectives are to prevent pressure loss of the fluid to be filtered, expand the filtration area, thereby achieving improvement in filtration performance and long service life. An object of the present invention is to provide a filter element that can continue to maintain good i-filtration performance over a period of time.

(Means for Solving the Problems) In order to solve the problems described in item 1, the present invention provides a filter element formed by winding a filter paper having a large number of pleats into a cylindrical shape. It is characterized in that the inner surfaces of both ends are joined to each other.

(Function) According to the above-mentioned means, the present invention allows the permeating fluid to flow at a uniform velocity in the axial direction from one end face to the other end face of the cylindrically wound element, and this axial flow During this time, the permeate fluid passes from the outer side of the element to the inner side and is filtered. Therefore, pressure loss can be reduced compared to conventional elements in which the n2 filtration fluid flows from the side of the element and flows from the outer end to the inner end, and because the flow rate is uniform in each part of the filter element. Uniform filtration is possible and filtration efficiency is improved.

(Example) Hereinafter, an example of a filter element according to the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 shows a sectional view of an oil filter, and the oil filter 1 includes an oil filter case 2, a filter element 3 housed in the oil filter case 2, and a bottom cover 8 that supports the filter element 3. and a reinforcing inner cylinder 9 of the element.

As shown in FIG. 2, the filter element 3 is made by folding a sheet of door paper to form a large number of pleats 4 and winding it into a cylindrical shape. and,
At both ends of the cylindrical filter element, each pleat 4
The sealed tube portion 5 is formed by joining the inner surfaces of the filter elements. This bonding is performed by superposing the opposing bonding surfaces of the pleats 4 and using ultrasonic waves, or by interposing an adhesive between the bonding surfaces.

Furthermore, each pleat 4 is formed radially.

The pair of pleat surfaces 4a, 4a are each subjected to wave processing, as shown in an enlarged cross-sectional view in FIG. The pitch p is set to be gradually larger toward the other end, and the pitch p is set to be constant. Note that the wave pitch p can also be increased from the inner end to the outer end of the element.

Thus, a pair of folds 1I4a in each pleat 4.

Since the outer surface of the door paper 4a has a protruding wave pattern, it is possible to prevent the inner surfaces of the door paper from coming into close contact with each other (even if each pleat 4 is joined at both ends of the element 3).

In the filter element 3 configured as above,
Small-diameter plates 6.degree. 6 are adhesively sealed to the inner ends of both ends of the element to fill the gaps inside the element.

Next, the operation of the filter element according to the present invention configured as described above will be explained.

1 and 2, oil sucked in from an oil intake port 81 formed in the bottom cover 8 of the oil filter flows into the oil filter case 2 via the check valve 10 as shown by the arrow. .

Then, as shown by the arrow in FIG. 1, the oil flows from below to above on the outside of the filter element 3, and during this flow from below to above, the oil passes through the filter element 3, flows into the inside of the

At this time, clean oil from which dust has been removed by being filtered by the filter element 31 is sent to the lubrication process from the oil outlet 2 at the bottom of the oil filter.

In the filter element 3 of this embodiment, the fluid to be filtered flows along the axial direction from the bottom to the top of the element, and during this axial flow, it passes through the element and is filtered to the inside of the element. flows into. Therefore, the inlet for the filtered fluid extends over the entire area of the annular end surface of the element 3, and its inlet area is extremely large, and the filtered fluid flowing from the lower end of the element 3 flows along the axial direction of the element. , the flow rate is uniform and there is no pressure loss.

Further, the inlet port 3□ formed at the lower end of the filter element 3 is shaped like a trumpet tube, that is, the inlet port 3□ is formed with approximately the same curvature as the natural streamline of the fluid. Contraction does not occur in the fluid flowing inward from the inflow port 31 into the filter element 3, making it possible to suppress water head loss to a minimum.

Further, each pleat surface 4a of the filter element 3 is subjected to wave processing, and the wave height h in the wave processing increases from the inner end to the outer end of the element, thereby increasing the filtration area. ing. In other words, in an element bent like a chrysanthemum, the distance between adjacent folds increases from the inside to the outside in the radial direction of the element. can be made larger. By applying corrugation to the folded surface 4a of the filter element 3, it is possible to prevent the paper from coming into close contact with the folded surface 4a due to the suction negative pressure of the pump. That is, when a highly viscous fluid or furnace material becomes clogged, the suction negative pressure of the pump causes the door paper to adhere tightly, reducing the flow path and causing an increase in pressure loss. In addition, in such cases, pressure concentrates in areas where the strength of the furnace material is weak, causing problems such as tearing of the ndosha, which may have a negative effect on the filtration effect. This can be prevented by doing this.

Further, due to the corrugation described above, the cross section of the filter element 3 becomes honeycomb-shaped as shown in FIG. The advantage of this private chamber 12 is that it prevents the dust attached to the surface of the paper from moving under the influence of the fluid. When dust moves, a cake layer formed by the dust itself is difficult to form and the life is shortened, but by preventing this, a longer life is possible.

〔Experimental result〕

Next, experimental results of the filter element according to this example will be explained in comparison with a conventional filter element.

The filter element is made of 70% chemical fibers, 25% valves, 5% inorganic fibers, and 0.80 m-thick paper with phenol resin as a solid diluent.

The oil filter used in the experiment has an outer diameter of φ65 and a size of 6
5 dragons. The outer diameter of the filter element installed inside this oil filter is φ62, the outer diameter of the reinforcing inner cylinder of the element is φ28, and the element height is 44 mm.

Under the above design conditions, a comparison experiment was conducted between a conventional filter element formed in a chrysanthemum-shaped cross section and a filter element according to the present invention.

The experimental conditions for this comparative experiment were as shown in JIS D3904, and the oil used at this time was an additive-free oil equivalent to SAE #30, the oil temperature was 80°C, and the test flow rate was 10I.
/mln.

According to the experimental results under the conditions described above, the pressure loss was 0.45 kg/c- for the conventional filter element, but 0.30 kg/c- for the filter element of this example, which is a dramatic increase in pressure loss. decreased significantly. The life of the filter element of the conventional filter element is 45 hours, whereas the filter element of this embodiment has a life of 60 hours, making it possible to extend the life of the filter element. The filtration efficiency of the conventional filter element was 78%, whereas the filter element of this example had a filtration efficiency of 83%, which was an improvement of about 5%.

〔Effect of the invention〕

As is clear from the description of the embodiments described above, the present invention provides a filter element formed by winding a sheet of paper with a large number of pleats into a cylindrical shape. Since the filter element is configured such that the surfaces that connect to each other, the F&T filtrate flows from one end face of the element to the other end face at h° in the axial direction at a uniform flow velocity, and the flow in the axial direction h In the meantime, the wave-filtered fluid passes through the element and is filtered. therefore,
Compared to conventional elements, where the filtration fluid flows from the side of the element and flows from the outer end to the inner end, pressure loss can be dramatically reduced, and the flow rate is uniform throughout each part of the filter element. Therefore, uniform t-filtration is possible and filtration efficiency is improved.

In addition, in the oil filter to which the filter element according to the present invention is applied, the fluid to be filtered (i) is introduced to the filtration surface of the filter element through a simple flow path, so that the flow of the fluid to be filtered is uniform, and as a result, the fluid to be filtered is Leads to improved performance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an oil filter equipped with a filter element according to the present invention, FIG. 2 is a perspective view of the filter element according to the present invention, FIG. 3 is a plan view of the filter element, and FIG. 4 is a view of the same filter. FIG. 5 is a sectional view of an oil filter equipped with a conventional filter element, FIG. 6 is a perspective view of the conventional filter element, and FIG. 7 is a plan view of the same filter element. . 1... Oil filter, 2... Oil filter case, 3... Filter element, 4... Crease, 4a
...Fold surface, 5...Sealing part, 8...Bottom cover,
9... Reinforced inner cylinder, 12... Private room. Applicant's representative: Sato - Figure 2 of Yutsuri No. 3, No. 6, Figure 2

Claims (1)

[Claims] 1. A filter element formed by winding a filter paper having a large number of pleats into a cylindrical shape, characterized in that surfaces of each pleat located on the inner side of both ends of the element are joined to each other.