CN1008692B

CN1008692B - Filter element and its production method

Info

Publication number: CN1008692B
Application number: CN 87106807
Authority: CN
Inventors: 雷天觉; 杨彦国; 杨锦华
Original assignee: Beijing Mechanical Industrial Automation Inst State Commission Of Machine-Buil
Current assignee: Beijing Mechanical Industrial Automation Inst State Commission Of Machine-Buil
Priority date: 1987-10-13
Filing date: 1987-10-13
Publication date: 1990-07-11
Also published as: CN1032492A

Abstract

The present invention relates to a filter element of a filter and a production method thereof. The present invention is characterized in that an element made of porous material is used as a supporting basal body of the filter element; fiber filtering material is deposited on the surface of the supporting basal body by a technological mode of pumping vacuum for forming a fiber filtering layer. The supporting basal body can be repeatedly used; the fiber filtering layer can be regenerated. Because the present invention has a complete fiber structure of the filter element and the close combination with the supporting basal body, the present invention has the advantages of elimination in bypass leakage, high intensity of the filter element, high filtering accuracy and large pressure difference resisting capability. The filter element is especially suitable for a hydraulic system.

Description

Filter element and its production method

The present invention relates to a kind of filter element and manufacture method thereof.This filter core is used for the mechanical admixture of separation of the fluid, is specially adapted to hydraulic system.

The technology of existing manufacturing filter core is that filter disc (using micropore filter paper to make usually) is wound on the iron sheet cylinder that is drilled with some apertures as support framework, and the junction with filter disc engages again, and adds upper end cover at the two ends of cylinder.U.S. Pat 4,071,394 methods in filter disc joint employing stitching; U.S. Pat 4,521,309 with the plastic end cover local melting, is bonded in the two ends of cylinder, though improved the sealing of end cap, complex process, and fail to eliminate the bypass leakage of filter disc joint, influence filtering accuracy.Simultaneously,, very easily break, can not bear the high workload pressure and the High Pressure Difference of hydraulic system because papery filter disc intensity is very low.In addition, existing filter core can't clean after obstruction, and cylinder and end cap can not be reused, and filter core can not be regenerated.

The objective of the invention is to provide a kind of novel filter, filter core and manufacture method thereof.This manufacture method and filter cartridge construction can improve the shortcoming of prior art, can eliminate bypass leakage.Improve filter core resistance to compression difference ability and filtering accuracy.And filter core can be regenerated, and supporting can be reused.

Characteristics of the present invention are: the element made from mushy material is deposited on support base surface with the method that vacuumizes with fibrous filter as the support base of filter core, forms the fiber filtering layer.The structure of filtering layer that makes like this is complete, does not have seam, can effectively eliminate bypass leakage and can improve resistance to compression difference ability and filtering accuracy.It is redeposited again and filter core is regenerated to remove original fiber filtering layer after filter core stops up.

Describe the manufacture method and the structure of filter core in detail below in conjunction with accompanying drawing.

Fig. 1 is the structure and the manufacture method schematic diagram of filter core.

Fig. 2 is the profile of filter core.

As shown in Figure 1: end cap (3) is pressed on the metal dish (8) with screw, metal dish (8) is sintered into one with support base (5), sealing ring (2) and (4) are placed in the groove of end cap (3), and pipe (1) inserts in the hole of end cap (3), and link to each other with vavuum pump. Whole filter core is immersed in the interior fibre pulp (7) of container (6).

Manufacturing step is as follows:

1. use to have mushy material-for example be made as the element of support base with powdered metallurgical material, element one end is metal dish (8), and it and support base (5) are sintered into one.

2. end cap (3) and metal dish (8) are used screw in compression, all be immersed in the fibre pulp (7) in the container (6) together with support base (5), vacuumize by pipe (1), fibrous filter in the fibre pulp is aspirated, be deposited on the surface of support base (8), form fiber filtering layer (9) (see figure 2).The thickness of filtering layer can be by concentration that changes paper pulp and the volume control of extracting plain boiled water out, and fibre concentration is by weight preferably being no more than 1.5%.

3. after filter core takes out from paper pulp, vacuumize dehydration again, the vacuum of vavuum pump should be not less than 700mmHg.

4. filter core is dried.

Employed supporting substrate material among the present invention is to have mushy agglomerated material, and preferably powdered metallurgical material also can be a ceramic material.The pore diameter of agglomerated material should be according to filtering accuracy, the pressure loss and the requirement selection of supporting the intensity of fiber filtering layer.It is 10 μ m to 300 μ m that rational range of choice can be decided pore diameter.

The shape of support base, available bus are the revolving body of broken line or straight line or cylinder or the cone that the bottom surface gabarit is broken line.

The composition of fibre pulp is that fibrous filter adds water among the present invention.Through test, fibrous filter concentration is by weight preferably being no more than 1.5%.Said fibrous filter can be cotton, hair, wood, fiber crops, asbestos, glass fibre or synthetic fibers, also can be the mixture of several fibers.

Fibre diameter can by several microns of zero points to tens of microns, length can be selected according to filtering accuracy from a few tenths of a mm to several millimeters, the diameter thin filtering accuracy of healing is higher.

The fiber filtering layer can be the single or multiple lift structure.When adopting sandwich construction, the thinner fiber manufacturing of the internal layer of filtering layer.

After filter core stops up, can remove the fiber filtering layer, clean support base, redeposited again fiber filtering layer and obtain regeneration.

The present invention has the following advantages and effect: by the filter core that the present invention makes, the fiber structure of filtering layer is complete, does not have seam, has effectively prevented bypass leakage, and existing technology all fails to address the leakage concern.Simultaneously, the fiber filtering layer of filter core engages with support base closely, and the intensity of fiber filtering layer increases, and has improved resistance to compression difference ability, and through test, the resistance to compression difference ability of filter core of the present invention is not less than 30Kgf/Cm ²And the filter core of existing tape wrapping formula filter disc has only 7Kgf/Cm ²Again, therefore the aperture of the support base of filter core of the present invention can be used more than the thin fibrous filter of latter's diameter and make filter core, and obtain high filtering accuracy much smaller than the aperture in order to the copper wire cloth of making filter disc.The filtering accuracy of filter core of the present invention is 3 μ m, if adopt thinner fibrous filter, can also improve precision, and the filtering accuracy of the filter core of tape wrapping formula filter disc 10 μ m only.

Most preferred embodiment of the present invention:

This example adopts the bronze powder of 40～60 orders (pore diameter 100 μ m) as supporting substrate material, and the geometry of support base is identical with accompanying drawing.The composition of fibre pulp is: weight ratio is 33% wood-fibred, and its average diameter is 30 μ m; Weight ratio is 17% cotton fiber, and its average diameter is 15 μ m; More than the average length of two kinds of fibers be 1.26mm; Other has 50% alkali-free glass fibre, and its average diameter is 0.36 μ m, and average length is 0.42mm; With above fiber mixing and water adding, fibre concentration is 1%.Implementation step: 1. with the method that vacuumizes with fiber laydown on support base, 2. vacuum dehydration is 3 minutes, 3. oven dry is 40 minutes, bake out temperature is 90 ℃～100 ℃.Obtain the thick fiber filtering layer of 1mm and make filter core by above process deposition.Through experiment test, this filter core performance is as follows: for the solid particle greater than 3 μ m, filter efficiency is not less than 99%, and resistance to compression difference ability is not less than 30Kgf/Cm ², be 35.7m/KgfS 20 ℃ through-current capability to Number 10 aviation hydraulic oil.

Claims

1, a kind of filter element, has support base, be surrounded by filtering layer outside support base, it is characterized in that: support base is to make with mushy material, and the outer filtering layer of support base is with the method that vacuumizes fibrous filter to be deposited on the fiber filtering layer that the support base surface forms.

2, filter element according to claim 1 is characterized in that: in order to make mushy material of support base, can be powdered metallurgical material or ceramic material.

3, filter element according to claim 2 is characterized in that: in order to make the powdered metallurgical material or the ceramic material of support base, its pore diameter can be from 10 μ m to 300 μ m.

4, filter element according to claim 1 is characterized in that: being deposited on the fiber filtering layer on support base surface, can be the single or multiple lift structure.

5, filter element according to claim 1 is characterized in that: its fibrous filter can be cotton, hair, wood, fiber crops, asbestos, glass fibre or synthetic fibers, also can be the mixture of several fibers.

6, a kind of in order to make method as the described filter element of claim 1 to 5, it is characterized in that:

A, make mixed uniformly fibre pulp;

The method that b, usefulness vacuumize is deposited on the support base fibrous filter in the fibre pulp, forms the fiber filtering layer;

C, vacuumize dehydration;

D, oven dry.

7, the method for manufacturing filter element according to claim 6 is characterized in that: the composition of making the fibre pulp of fiber filtering layer is that fibrous filter adds water.

8, the method for manufacturing filter element according to claim 6 is characterized in that: the concentration of fibre pulp is no more than 1.5% by weight.