KR20050020821A - Device for filtering fluids that are conveyed under a high pressure - Google Patents

Abstract

The present invention relates to a device for filtering a fluid conveyed at a high pressure, and easy to maintain, and to a filtration device that is capable of withstanding a maximum pressure load with an enlarged filtration surface as opposed to a conventional high pressure filter. To this end, the filtration device comprises a metallic housing 2 comprising an inlet opening 21, an outlet opening 24, and a maintenance opening 3, 4 surrounding the filtration chamber 23. have. The maintenance openings 3 and 4 are sealed by the lids 14 and 15 made of metal. The cover is seated on the rim portions 5, 6 surrounding the maintenance openings 3, 4 so as to be in direct contact with the metal of the housing 2 under a pressing force, the rim portions 5, 6. The rim surfaces 7, 8 coupled to the lids 14, 15 at) are inner surfaces 9 and outer surfaces 11 adjacent to the rim surfaces 7, 8 at the rim portions 5, 6. ) And angles of less than 90 ° each, and the contact surface between the lids 14, 15 and the rim portions 5, 6 is limited in scope on the rim surfaces 7, 8. The rim surfaces 7, 8 preferably extend inclined between an inner boundary edge 10 and an outer boundary edge 12 coupled to the maintenance openings 3, 4, and the filtration chamber 23. Inside the filter element 26 is arranged, through which fluid flows through the fluid flow path from the inlet opening 21 to the outlet opening 24.

Description

Filtration device for fluids conveyed at high pressure {DEVICE FOR FILTERING FLUIDS THAT ARE CONVEYED UNDER A HIGH PRESSURE}

The present invention relates to an apparatus for filtering a fluid conveyed at high pressure. Such filtration devices are needed in the field of processing technology for purifying fluids to be handled at the time of manufacture, such as in the manufacture of plastics or biotechnology. In these applications, the filtration chamber must be kept airtight from the environment at all times during operation.

For example, conventional filtration devices, which are actually used for high pressure applications up to 4,300 bar, such as filtration devices available from Hochdrucktechnik HOTEC GmbH, are usually tubularly designed and coaxially coupled within a high pressure line. And a housing. The filter is equipped with a membrane filter element, which can filter only very small amounts of contaminants because of its small filtration surface. In addition, the filter element has the disadvantage of causing extremely high pressure loss when more fluid flows under high pressure. Filters that can absorb more contaminants while keeping pressure losses low can usually only be used at pressures up to 500 bar.

In the case of known filtration devices, at high pressures sufficient pressure resistance is provided only if the filtration surface is very small. In contrast, in an apparatus for medium pressures up to 500 bar, the pressure resistance is not sufficient when a sufficient filtration surface is provided. Another disadvantage of known devices used for high pressure is that they must be completely disconnected from the pipe connection for maintenance.

1 is a longitudinal sectional view showing an apparatus for filtering a fluid used in manufacturing in accordance with a processing technique.

FIG. 2 is a view of the device shown in FIG. 1 from the end. FIG.

3 is a schematic diagram showing another embodiment of the apparatus shown in FIG.

<Explanation of symbols for the main parts of the drawings>

1: filtration device 2: housing

3, 4: Maintenance opening 5, 6: Rim part

7,8: rim surface 9: inner surface of the housing (2)

10: inner rim edge of rim surface (7, 8)

11: outer surface of housing (2)

12: outer rim edges of rim surfaces 7 and 8

13: angle between inner surface and rim surface

14, 15: cover 16: cover surface

17: Rim part 18, 18a: screw hole

19: through hole 20: locking screw

21: inlet opening 22: connection

23: filtration chamber 24: outlet opening

25: connection part 26: filter body

27: sealing surface 28: spring

29: nut 30: fixing bolt

30a: shank portion of fixing bolt 30

30b, 30c: threaded portion of the fixing bolt 30

F: Flow direction L: Longitudinal axis of the filtration device 1

It is an object of the present invention to provide an apparatus which can withstand two weeks of high pressure and which is much easier to maintain than the conventional high pressure filter.

The object of the present invention is to provide a device for filtering a fluid conveyed at a high pressure, comprising an inlet opening, an outlet opening, and a metal housing surrounding the filtration chamber, wherein the housing is sealed by a cover made of metal. A service opening, wherein the cover is achieved by a filtration device seated on a rim portion surrounding the maintenance opening that is in direct contact with the metal of the housing in a state of adhesion. do. Furthermore, according to the filtration device, the rim surface of the rim portion coupled to the lid is at an angle of less than 90 ° with the inner and outer surfaces of the rim portion adjacent to the rim surface and between the lid and the rim. Is formed inclined between an inner boundary edge and an outer boundary edge coupled to the opening, such that the contact surface of the rim surface is limited to a portion of the rim surface, and within the filter chamber a filter element is arranged to allow fluid to flow from the inlet opening to the outlet opening. have.

The filtration device according to the invention comprises a housing having an opening for maintenance. The maintenance opening is arranged such that a filtration chamber surrounded by the housing is accessible through the maintenance opening. In this regard, in order to ensure the airtightness of the housing even at high pressures, the rim surface on which the cover is disposed is inclined such that a linear contact is made between the cover and the rim when the cover is placed. If the lid is then in close contact with the rim, the force is highly concentrated in the contact area. This results in deformation of the metal in the contact area, which causes the shape of the rim surface to conform to the shape of the lid surface in contact with the rim surface. In this way, a metal seal is provided that can reliably prevent fluid from leaking from the filter housing over long periods of time even under high pressure.

Particularly preferred for the sealing of the maintenance opening according to the invention is that there is no open gap in which contaminants may precipitate. In this way the filtration device according to the invention can meet very stringent hygiene requirements without requiring complicated structural measures.

Preferably the filter element is formed as a filter body seated on one of the walls defining the range of the filtration chamber, the filter body being also perfused by a fluid in the region of the circumferential surface of at least one of its circumferential surfaces. . In this way the filtration surface perfused by the fluid and thus the throughput by the filter is enlarged. Particularly preferably in this connection the sealing face of the filter element surrounds the outlet opening. In this arrangement, the filter body may protrude into the filtration chamber freely from the wall where the outlet opening is formed. In this way it is possible to use the largest filtration surface that can be perfused by the fluid. In addition the filter body may have a cylindrical shape as is known from conventional filter cartridges.

In assembling the filter main body, the assembling can be made easier as the elastic force acting on the sealing surface from the filtration chamber is applied to the filter element. In the elastic force generated by a spring, for example, the elastic force serves to fix the filter element until the sealing surface of the filter element is automatically brought into close contact with the corresponding wall of the housing by a pressurized fluid.

According to another preferred embodiment of the invention, the housing is characterized in that it is tubular. According to this variant of the invention, not only can the design of the filtration device according to the invention be particularly simple, but it can also be designed to have two maintenance openings in a similarly simple manner. In this regard, each maintenance opening may be closed by a lid which is in close contact with each of the rim portions while in direct contact with the metal of the housing, wherein each rim surface coupled to the lid at the rim portion is the rim portion. Each rim surface may be inclined to extend between an inner boundary edge and an outer boundary edge coupled to the opening such that the angle with the inner surface and outer surface adjacent to the rim surface is less than 90 °, respectively. In this regard, the adhesion required for hermetic seating of the cover is formed by fixing the cover to each other. To this end, it is possible to use a locking screw or fixing bolt that acts according to the type of expansion bolt and can reliably accommodate the peak load occurring for a short time based on its expandability. Therefore, by using the above-mentioned expandable locking screw or fixing bolt, the continuous sure tightness of the filtration device according to the present invention can be ensured over a long period of operation even in unfavorable conditions.

The construction of the filtration device according to the invention can be further simplified by the inlet opening being formed in the cover and the outlet opening in another cover.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

The filtration device 1 of the present disclosure comprises a tubular housing 2 made of a suitable material such as, for example, steel or other metals, composites or ceramics. The housing includes respective maintenance openings 3, 4 at both ends thereof. In this connection the diameters of the maintenance openings 3, 4 correspond to the diameters of the tubes of the housing 2. The rim portions 5, 6 of the housing 2 surrounding the maintenance openings 3, 4 respectively have a rim surface 7, 8 formed in the end face of the housing 2. Include. These rim surfaces 7, 8 are formed from the outer rim edge 12 coupled to the outer surface 11 of the housing 2 from the rim edge 10 coupled to the inner surface 9 of the housing 2. Inclined in the direction, a sharp angle 13 is formed between the rim surfaces 7, 8 and the inner surface 9 of the housing 2.

On each of the rim surfaces 7, 8 a lid 14 and a lid 15 are arranged, respectively. The cover surface 16 coupled to the rim surfaces 7, 8 is flat, thus covering the cover surface 16 and the rim surface 7 in the region of the inner rim edge 10 of the rim surfaces 7, 8. , 8) a real linear contact is made. In this connection the side rim portions 17 of the lids 14, 15 surround the outer surface 11 of the housing 2 in the region of the rim portions 5, 6, whereby the lids It is located in the center of the end face of the housing 2.

In the cover 14 which is first passed in the flow direction F, screw holes 18 are formed at regular angles about the longitudinal axis L of the filtering device 1, and the axis of the screw hole is the longitudinal axis L. It extends parallel to). The cover 15 disposed opposite the cover 14 is provided with through holes 19 which are aligned with the screw holes 18 and are identically arranged. The locking screws 20 are guided through these through holes 19. When the locking screws 20 pass through the through holes 19, the head portion of the locking screw is against the outer surface of the lid 15 facing in the opposite direction of the lid 14, and the threaded portion of the locking screw is Is screwed into the corresponding screw holes 18.

In this way, the covers 14, 15 are fixed to each other, thereby applying a high adhesion to the rim surfaces 7, 8. Since the contact surface between the lids 14, 15 and the rim surfaces 7, 8 is practically limited to a straight line, a force is highly concentrated within the contact area. This deforms the metal of the rim portions 5, 6 and the lids 14, 15 in the contact area, thereby providing a high pressure of up to 1,500 bar between the housing 2 and the lids 14, 15. The metal seal is formed to reliably withstand and maintain a hermetic seal.

The inlet opening 21 extending coaxially with respect to the longitudinal axis L is formed in the cover 14 which passes preferentially in the flow direction F. As shown in FIG. The inlet opening extends from the connecting portion 22 formed on the outer surface of the cover 14 into the cylindrical filtration chamber 23 surrounded by the housing 2. In the lid 15, which is located opposite the lid 14, an outlet opening 24 is formed which is aligned with the inlet opening 21 and extends coaxially with respect to the longitudinal axis L. The outflow opening 24 extends from the filtration chamber 23 to a connection 25 formed on the outer surface of the lid 15.

The cylindrical filter main body 26 is arrange | positioned similarly in the said cylindrical filtration chamber 23, The diameter of the said filter main body 26 is smaller than the diameter of the said filtration chamber 23. As shown in FIG. An end sealing surface 27 of the filter body 26 coupled to the lid 15 is sealably placed on the lid surface 16 of the lid 15 and surrounds the outlet opening 24, thus Outflow openings (not shown) of the filter main body 23 lead directly into the outflow opening 24 of the filtration device 1. The axial extension of the filter body 26 is sized such that the front wall of the filter body coupled to the cover 14 is spaced apart from the cover surface of the cover 14. In this connection, a spring 28 seated in a groove of the cover 14 applies an elastic force on the filter body 26, and by this elastic force the filter body 26 and its sealing surface 27 are It is in close contact with the lid surface 16 of the lid 15. The circumferential surface of the filter body 26 is formed as a filter membrane.

In the final assembled state, a pipe (not shown) is screwed into the connections 22, 25. As soon as the fluid to be filtered is introduced into the filtration chamber 23, the filter body 26 and its sealing surface 27 are brought into close contact with the cover surface 16 of the lid 15 by the fluid. The fluid then flows around the filter body 26 and passes through a filter membrane formed on the circumferential surface of the filter body 26 before exiting from the filtration device 1 through the outlet opening 24. .

If the filter main body 26 is to be maintained, the locking screw 20 may be loosened. The filtration device 1 can then be easily separated into individual parts for maintenance and reassembled in the same manner.

The filtration device 100 shown in FIG. 3 is only used in this filtration device 100 in that a fixing bolt 30 is used instead of the locking screw 20 used in the filtration device 1. Different from 1). In this regard, the fixing bolt 30 includes a shank portion 30a having a reduced cross section than other portions of the fixing bolt 30 to improve its expansion behavior. Each end of the fixing bolt 30 is provided with threaded portions 30b and 30c.

The threaded portion 30b coupled to the lid 14 is screwed into a screw hole 18a formed in the lid 14 as a blind hole, while the other threaded portion 30c is attached to the other lid 15. It protrudes at least partially from the face of the lid 15 which penetrates through holes 19 in the opposite direction of the lid 14. A nut 29 is screwed into the screw portion 30c protruding as described above, and the covers 14 and 15 are fixed to each other through the nut. The advantage of using a fixing bolt 30 that acts as an expansion bolt is that the pressing force thus formed reacts more flexibly to the load peak, resulting in a higher pressing force that can ensure higher stability of the seal. Can be.

Claims (10)

An apparatus for filtering a fluid conveyed at high pressure, An inlet opening (21), an outlet opening (24), and a metal housing (2) surrounding the filtration chamber (23), The housing includes maintenance openings 3 and 4 which are closed by lids 14 and 15 which are made of metal, and the lids 14 and 15 are in direct contact with the metal of the housing in the state where adhesion is applied. It is seated on the rim portion surrounding the maintenance opening, The rim surfaces 7, 8 of the rim portions 5, 6, which are coupled to the lids 14, 15, are the inner surfaces of the rim portions 5, 6 adjacent the rim surfaces 7, 8 ( 9) and at an angle of less than 90 ° with the outer surface 11 and the contact surface between the lid 14, 15 and the rim portions 5, 6 is limited to a part of the rim surface 7, 8, Is inclined between an inner boundary edge 10 and an outer boundary edge 12 coupled to the openings 3, 4, Filter element (26), characterized in that the filter element (26) is arranged in the filtration chamber (23) to allow fluid to flow from the inlet opening (21) to the outlet opening (24). The method of claim 1, The filter element is formed as a filter body 26, which is seated on a wall defining the range of the filtration chamber 23 and in the region of the circumferential surface of at least one of the circumferential surfaces thereof. A filtration device, characterized in that flow through the fluid. The method of claim 2, The sealing surface (27) of the filter element (26) is characterized in that it surrounds the outlet opening (24). The method according to claim 2 or 3, The filter element (26) is characterized in that it is loaded by an elastic force acting on the sealing surface (27) from the filtration chamber (23). The method according to any one of claims 2 to 4, Filtration device, characterized in that the filter element (26) has a cylindrical shape. The method of claim 5, The maintenance openings (3, 4) are formed in the end faces of the tubular housing (2). The method according to any one of claims 1 to 6, The housing (2) is filtration device, characterized in that formed in a tubular shape. The method according to any one of claims 1 to 7, Filtration device, characterized in that the cover (14, 15) is fixed to each other. The method of claim 8, The mutual fixing is a filtration device, characterized in that formed by a locking screw or fixing bolt (30) acting according to the type of expansion bolt. The method of claim 8, The inlet opening (21) is formed in one of the covers (14, 15) and the outlet opening (24) is formed in the other of the covers (14, 15).