JPS6323940Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a multi-layer filter cartridge, and particularly to a general-purpose liquid filter cartridge with high precision and performance. Conventionally, a cylindrical liquid filter cartridge is fixed to a container, and the liquid is supplied under pressure and passed through a filter for cleaning. In other words, the materials used for general-purpose cartridges with a total length of 250 mm, inner diameter of 30 mm, and outer diameter of around 65 mm (500 mm, 750 mm, etc. are also available for total length) are thick paper, wire mesh, sintered metal, foam, natural fiber, or synthetic fiber. Currently, the cheapest filter cartridge is one in which twisted yarn is wound around a cylindrical hard perforated core (hereinafter referred to as the all-wind type). This is because other cartridges are made of resin, sintered metal, or
While processes such as chemical treatment are required, the all-wind type can achieve practical strength only by winding tension during manufacturing. The all-wind type is usually made by winding thick twisted yarn around a hard perforated core, and from the outside of the overtube, which has a density gradient caused by various stitches (hereinafter referred to as the matrix) and the collapse of the internal material. It is wound so that liquid passes inside, coarse particles are removed on the outside, and fine particles are removed inside. However, in the all-wind type, the pores tend to be uneven due to uneven squeezing caused by uneven winding, uneven twisting of the yarn, etc., and it has been particularly difficult to control the maximum particle diameter discharged. In addition, all-wind type materials consist of pores between yarns and pores between fibers, and pores between yarns depend on the forming matrix, and pores between fibers depend on the number of twists, the fine shape of the fibers, and the compression density due to tension. Therefore, overaccuracy is controlled. Therefore, in order to increase overaccuracy, it is essential to use ultra-fine fibers to minimize the space between fibers and to wind them at high density. It is extremely difficult to create threads with a diameter of less than 10μ, and even if it were possible to twist them,
Due to the high density winding, the pores between the fibers become dead, resulting in an impractical cartridge filter with extremely high pressure loss. The present invention provides an all-wind type filter cartridge that solves the above-mentioned problems.The gist of the invention is to wrap a material around the outer periphery of a cylindrical hard perforated core, and fill the outer periphery of the material with non-woven fibers. The point is that an overlayer is provided in which thick twisted yarn is cross-wound through an ultra-thin overlayer consisting of. The present invention will be described in detail below with reference to the drawings. Figure 1 is a cross-sectional view of the tube of the present invention, Figure 2 is Figure 1A-
It is a view from arrow A. In the figure, a cylindrical hard perforated core 10 has holes 14 formed therein. An overlayer 12 (hereinafter referred to as a prefiter) and an overlayer 13 are provided on the outer periphery of the core 10, and an ultrathin overlayer 11 (hereinafter referred to as the main material) made of a filler of nonwoven fibers is interposed between the overlayers. be. That is, a thick twisted yarn is cross-wound around the hard perforated core until the volume of the prefilter section 12 (made of wound material) and the surface area of the main material section 11 (made of compressed and supported non-woven fibers) are balanced. do. For example, main material 1
The wire diameter of the prefilter material 12 is 3μ on average, the pores between the fibers after compression are 8μ on average, and the wire diameter of the prefilter material 12 is flat.
In the case of a limit tension of 20μ, the outer diameter of the material 13 is wound to about 50φ. It is recommended to use glass fiber, polyester fiber, or cotton fiber as the main material. The binder is not particularly limited, but
Experiments show that there is no need to use a binder. In addition, as shown in Figure 3, the average 1μ is applied to the 48φ section.
Main material 11-2 of wire diameter, average 7μ in 50φ part
Wire diameter main material 11-1, pre-filter 12
A combination of winding with an average wire diameter of 10μ and a medium tension is possible, but the present invention is not limited to this. In summary, the material 13 is a support for the main material 11, and the material 12 merely serves as a prefilter for the main material 11. Therefore, overaccuracy is determined by the main material 11, and the material 13 only needs to have the function of supporting the fine fiber layer of the main material 11. Therefore, unlike the conventional example, it is not necessary to increase the density and create a density gradient in order to improve overaccuracy. According to experiments, it is preferable that the density gradient is such that the density of the material 13 is less dense than that of the material 12. EXAMPLE The results of a comparative test of the multilayer tube of the present invention with a comparative example are shown below along with a life test and a flow rate test. Figure 4 shows the life test, and Figure 5 shows the flow rate test. The overtube had a total length of 250 mm, an outer diameter of 62 mm, and an inner diameter of 30 mm. The life comparison test was conducted in the following manner. Particle size distribution of silicon carbide dust 20μ or more 10%,
Raw water containing a certain amount of 24% of 11-19μ, 32% of 5-10μ, and 34% of 5μ or less was passed for 15 minutes and the change in pressure loss over time was recorded. In the flow rate test, dust-free water was passed through the sample, and the pressure drop at each flow rate was recorded. During the life comparison test, water was collected at regular times and the particle size of dust particles in the water was measured using a microscope. The accuracy test results are shown in Table 1.

[Table] (Maximum particle diameter discharged)
The overtube of this invention has an average wire diameter as the main material.
A nonwoven fabric made of 3μ glass fibers was used as a pre-material, and a polypropylene wire with an average diameter of 20μ was cross-wound at a tension limit. Comparative Example 1 is an all-wind type high-density product, and Comparative Example 3 is an all-wind product having almost the same flow characteristics as the present invention. As is clear from FIGS. 4 and 5, the pressure loss of the present invention is lower than that of Comparative Example 1. Also, comparative example 3
There is not much difference in the flow rate test, but as shown in Table 1, the present invention is extremely superior in terms of maximum particle size discharged in the accuracy test.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the present invention, Figure 2 is a cross-sectional view taken along the line A-A in Figure 1, Figure 3 is a cross-sectional view of another example of the present invention, and Figure 4 is pressure loss versus time. FIG. 5 is a graph of pressure loss and flow rate. 10: Hard perforated core, 11: Ultra-thin overlayer, 1
2, 13: superlayer, 14: pore.

Claims (1)

[Scope of utility model registration request] A filter medium is wound around the outer periphery of a cylindrical hard perforated core, and a filtration layer is provided around the outer periphery of the filter medium, in which thick twisted yarn is cross-wound through an ultra-thin filtration layer made of a filler of non-woven fibers. A multilayer filtration cylinder.