JPS6363013B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a filter element used in an oil separator.

[Prior art]

The gas discharged from a compressor contains a large amount of oil mist, and a mist separation device as shown in FIG. 1 has conventionally been used to separate and remove this oil mist. The mist separation device has a structure in which a filter element 2 is housed in a container 1 having an inlet 3 and an outlet 4, and the filter element 2 is formed in a hollow cylindrical shape with a filled layer 6 of fibers, such as ceramic wool. There is. The bottom 7 of the cylindrical portion is closed with a disk 5, and the upper end of the hollow cylindrical portion is fixed to the upper end inside the container 1 so as to communicate with the gas outlet 4.

The gas that has now flown in from the inlet 3 flows from the outer circumference to the inner circumference of the fiber-filled layer 6 as shown by the arrows.
While flowing through the fiber-filled layer 6, the oil mist in the gas aggregates and grows into large oil droplets, which are separated from the gas and accumulate at the bottom 7 of the hollow cylindrical portion of the filter element 2. This accumulated oil is removed via an oil drain pipe 8 and a throttle 9.

In the above structure, the fiber-filled layer 6 is clogged with foreign matter contained in the gas, which may cause a pressure loss. This pressure loss causes irregular gas flow, which prevents the device from functioning normally and has the disadvantage of shortening its lifespan.

Further, the ceramic wool forming the fiber-filled layer 6 has good adsorption power and its initial separation performance is superior to that of glass wool, so that the apparatus can be made smaller. However, since they are short fibers and the material itself is fragile, it is easily affected by pressure loss, which poses a problem in terms of lifespan.

[Purpose of the invention]

In view of the above, an object of the present invention is to provide a filter element that has good separation performance and has a long life.

[Summary of the invention]

The present invention provides a first element layer consisting of a perforated plate, a woven fabric, and a mesh with a mesh coarser than the woven fabric, a second element layer consisting of a perforated plate and the above-mentioned mesh, and a gap between the first and second element layers. The device is characterized by comprising a third element layer in which ceramic fiber layers and the network are alternately arranged.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, 10 is a cylindrical perforated plate 11,
An inner element layer (first element layer). Reference numeral 14 denotes an outer element layer (second element layer) consisting of a cylindrical mesh 13b made of glass fiber or metal and a perforated plate 15 wound around the outer periphery of the cylindrical mesh 13b.
Between this outer element layer 14 and the inner element 10, a multiple intermediate element layer 16 (third element layer) is formed by alternately providing ceramic fiber layers 17 and meshes 13a made of glass fiber or metal. is mediated.

The inner and outer element layers 10, 14 and the intermediate element layer 16 interposed between the inner and outer element layers 10, 14 are formed as shown in FIG. That is, about 1 layer of woven fabric 12 is placed around the outer periphery of the cylindrical perforated plate 11.
The woven fabric 12 is wound half a time, and the net 13 and the ceramic fiber layer 17 are superimposed on the outer periphery of the woven fabric 12, and the woven fabric 12 is wound several times around the outer periphery with the net 13 inside. Since the net 13 is longer than the ceramic fiber layer 17, only the long portion 13b is further wrapped around the outer periphery of the ceramic fiber layer 17, and then the perforated plate 15 is wrapped around the outer periphery.

18 is a wire mesh layer provided inside the inner element layer 10 with an air layer 19 in between; 20 is a circular plate with an open center; its inner peripheral edge 21 and outer peripheral edge 22 are bent inward; It is fitted and fixed into the inner wire mesh 18 and the outer element layer 14.

The filter element having the above structure is used in the same way as the filter element 2 shown in FIG. Therefore, when the gas passes through the multiple layers of the ceramic fiber layer 17 and the nets 13, 13a, and 13b, the oil mist in the gas condenses with each other.
It grows into large oil droplets. When these oil droplets exit into the air layer 19, most of them are separated from the gas, accumulate in the lower part of the air layer 19, and are discharged into the hollow portion 23 through the wire mesh 18. The wire mesh 18 serves to prevent oil mist that has turned into large oil droplets from scattering again.

〔Effect of the invention〕

Next, the operation and effects of this embodiment having the above-described configuration will be explained.

The perforated plate 15 generally has a porosity of about 20 to 30%, and the effective portions through which gas passes are the portions of the perforated plate 15 corresponding to the holes. For this reason, if a woven cloth is used for close contact as in the past, since the woven cloth has a very fine mesh, the ceramic fiber layer will be pushed downstream by the wind pressure of the gas.
As a result, the ceramic fiber is gradually biased toward the weaker portion, and the element filling layer becomes denser, resulting in an extremely poor oil mist separation performance.

However, in the present invention, the inside of the perforated plate 15, that is, the outer periphery of the glass fiber layer 17, is made of glass fiber or metal having a certain thickness, and the perforated plate 15 is formed by wrapping the mesh 13b, which is coarser than the woven fabric, about twice. Since the gas is prevented from coming into close contact with the porous plate 15, the gas can effectively flow through the non-porous portion of the porous plate 15, so that the gas flow can be made uniform. Also net 13
Since b and 13a are coarser than the woven fabric, the force of pressing the ceramic fiber layer 17 toward the downstream side due to the wind pressure of the gas is reduced, so that it is possible to prevent the filled layer from becoming dense.

Furthermore, the intermediate element layer 16 of the present invention includes a ceramic fiber layer 17 of a constant thickness and nets 13a, 13.
Since it is formed by overlapping the fibers (b), the strength is improved compared to a structure made only of glass fibers, and the fibers do not become visible even when clogging occurs. Therefore, the oil mist separation performance is stable even during long-term operation, and the service life can be extended.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an oil separator equipped with a conventional filter element, Fig. 2 is a sectional view showing an embodiment of the filter element of the present invention, and Fig. 3 is an explanatory diagram of the structure of the element layer of the same embodiment. be. 10... Inner element layer, 11, 15... Perforated plate, 12... Woven fabric, 13, 13a, 13b...
Net, 14... Outer element layer, 16... Middle element layer, 17... Ceramic fiber layer.

Claims (1)

[Scope of Claims] 1. In a device that separates oil mist contained in gas by passing gas through a filter element, the filter element is composed of three element layers, the first element layer consists of a perforated plate, a woven fabric, and a mesh coarser than the woven fabric, the second element layer consists of a mesh and a perforated plate, and the third element layer has ceramic fiber layers and a mesh arranged alternately, Moreover, the filter element is arranged between the first element layer and the second element layer, and the gas flows through each of the second, third, and first element layers in this order. 2. The third element layer has ceramic fiber layers on both sides, and meshes and ceramic fiber layers are arranged alternately between the two ceramic fiber layers, and the ceramic fiber layers on both sides of the third element layer have ceramic fiber layers on both sides. 2. A filter element as claimed in claim 1 in contact with the mesh of the first and second element layers.