Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D27/00—Cartridge filters of the throw-away type
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
  • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
  • G01N15/082—Investigating permeability by forcing a fluid through a sample
  • G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change

Definitions

• the present invention relates to a method for producing filter cartridges according to the preamble of claim 1 and a test device according to that of claim 7.
• filter cartridges and in particular oil filter cartridges by encapsulating the actual medium filter element in a filter housing, the base part of which has a threaded connection for the filter medium.
• the filter cartridge is screwed onto a system-side supply line for the medium to be filtered.
• a sealing area surrounding the threaded connection is provided on the base part, which is tightened against a line-side sealing area when the filter cartridge is screwed on.
• the object of the present invention to prepare a • manufacturing method or a test device of the type mentioned propose, by means of which it is ensured that the manufactured filter cartridge has been tested under appropriate practical conditions.
• the method according to the invention of the type mentioned at the outset is characterized in that, following the assembly of the filter housing and filter, a threaded head is automatically screwed into the threaded connection with forced rotation, and the filter cartridge with a screwed-in threaded head is inserted into a tightness test chamber, where through Creating a pressure difference across the filter housing wall and observing the pressure behavior in and / or outside the filter housing for leaks or non-leaks in the filter housing, and observing the screwing-in movement of the threaded head, concludes that the filter housing has met or failed to conform to shape specifications.
• the filter housing with the base part is placed on a transport plate, through which the threaded head is screwed into the threaded connection, and then the Threaded head the sealing section on the base part of the filter housing clamped against the transport plate.
• the transport plate is moved relatively against a test chamber with which the transport plate forms the pressure test chamber.
• the interior of the filter housing is further pressurized by the threaded head and / or by regions immediately adjacent to it on the transport plate.
• the screwing-in movement of the threaded head, the possibly provided sealing area bracing against the transport plate and the possibly simultaneous relative movement of the transport plate and test chamber bell are realized by means of a single linear drive.
• the transport plate is mounted on a carrier part and the threaded head - which is also displaceable with respect to the carrier plate in order to carry out its screwing-in or unscrewing movement - is linearly spring-mounted in this regard and the position of the threaded head with respect to the Carrier part is detected. If, for example, the threaded head does not reach a TARGET position during the intended screwing-in movement, it can be concluded that the connection thread provided on the filter cartridge housing is not properly present, for example is too narrow.
• the sealing part is tensioned against the carrier plate at the base of the housing filter by pulling back the threaded head. If the thread provided on the filter housing is now too wide or not at all, the preferred position detection of the threaded head when retracting or tightening, as mentioned, detects that the threaded head is being pulled out of the threaded connection to an impermissible extent.
• the test device has on a frame at least one support plate, aligned with the support plate, usually above it, a test chamber bell, the plate and bell being linearly movable relative to one another in such a way that they together form a test chamber which can be sealed.
• a threaded head which is rotatably and linearly movable relative to the plate is now provided, which is movable through an opening in the carrier plate, essentially perpendicular to the surface of the carrier plate.
• the single figure schematically shows the essential components of the test device according to the invention to explain the manufacturing method according to the invention.
• a test chamber bell 3 is mounted on a frame 1, which together with a carrier plate 5 forms an open and closable, tight test chamber.
• a receiving chamber 7, opposite the bell 3, is mounted on the carrier plate 5 and can be moved linearly with the carrier plate 5 with respect to the frame 1 and as shown at 9.
• a cylinder 11 is mounted in the chamber 7 so as to be linearly displaceable in the direction of the device axis A. He rides at the end on a transmission anchor 13.
• a threaded head 15 is mounted in a rotationally fixed linear manner in the direction of the device axis A such that it is resiliently movable with the spring element 17.
• the transmission anchor 13 leaves the chamber 17, linearly movable in the direction of the device axis A, through an opening 19.
• a slide 21 is also mounted, movable in the direction of the device axis A.
• the transmission anchor 13 enters a chamber of the slide 21, is rotatably mounted therein and resiliently and linearly supported in the frame of the suspension 25 in the direction of the device axis A. .
• the chamber 7 connected to the plate 5 and the chamber of the
• Carriage 21 are coupled in motion via a two-armed lever 27.
• One arm 27a of the lever 27 is - as shown at 28a - pivoted on the chamber 7 and pivoted on the central bearing 28b with the second lever 27b.
• the second lever 27b for its part - as shown at 28c - is pivotally mounted on the slide 21.
• the center joint 28b of the two-armed lever 27 is guided in a guide curve 31 which is stationary with respect to the frame 1. This defines a movement path for the central joint 28b, with a transverse component y, transverse to the direction of the arrangement axis A.
• a conversion gear 33 rides on the transmission anchor 13.
• the conversion gear 33 has a linear movement pickup, as shown, preferably a pick-up wheel 35, preferably a gearwheel, which picks up the linear movement of the transfer anchor 13 with respect to the frame 1 along a predetermined section, such as represented by meshing the gear 35 with a rack section 37 on the frame 1.
• the gear 33 converts the relative linear movement detected on the input side - basically the linear relative movement of bell 3 and plate 5 - depending on their direction, into the rotary movement ⁇ of the armature 31, which is transferred to the screw head 15.
• a compressed air line 39 opens into the chamber 7.
• a pressure curve evaluation unit 43 is connected to the bell 3, optionally connected to an evacuation line 41.
• a linear drive 45 such as a pneumatic piston-cylinder arrangement, is preferably provided as the only active drive for the test device between frame 1 and carrier plate 5 or chamber 7, the test device explained in terms of its structure with reference to the figure works as follows in the context of the manufacturing method according to the invention :
• a previously assembled filter cartridge 50 is with its overall • threaded opening 52 on the housing base 54 coaxially over the threaded Dekopf 15 or the designated opening in the plate 5. There it is held by a holding device, for example by means of a suction device (not shown) or, and preferably, by magnets 46, permanent and / or electro-magnet. This with the bell 3 and carrier plate 5 moved apart relatively maximally.
• the drive 45 is activated.
• the carrier plate 5 with the filter cartridge 50 to be tested and the test chamber bell 3 are moved linearly along the frame 1.
• the carriage 21 follows this movement via the two-armed lever 27, coupled in motion.
• the gear 33 comes into operation, with the transmission anchor 13 the threaded head 15 is set in rotation. It automatically screws into the threaded connection 52 of the filter cartridge 50, overcoming the force of the spring 25.
• the center joint 28b runs away laterally in the guide 31, which means the distance between the slide and Plate 5 is shortened, which further enables the screwing movement of the threaded head 15.
• the carrier plate 5 is placed close to the bell 3, and by pressurizing the line 39, and if necessary evacuating through the line 41, a leakage test pressure difference is applied across the wall of the filter cartridge 50.
• the leakage test is carried out in a known manner from tracking the pressure curve outside and / or inside the filter cartridge 50.
• the carrier plate 5 is retrieved via the drive 45, and the threaded head 15 is unscrewed from the threaded connection due to the reversal of direction via the gear 33.
• An essential aspect of the method according to the invention and the test device according to the invention is that it also determines whether the connection thread of the filter cartridge 50 has been created in accordance with the regulations or not. If the thread mentioned is too small or missing, such that when attempting to screw in the thread head 15 when the plate 5 is raised, the thread head 15 strikes essentially at the level of the base 54, this causes the thread head 15 and thus also the transmission anchor 13 during the movement of the plate 5 against the bell 3, an upper TARGET position SHOULD not be reached at all, but is pushed in against the force of the spring 17.
• the threaded connection on the cartridge 50 is designed in such a way that the threaded head can be inserted or pulled out into an opening provided without gripping a thread, this results when the distance between the carrier plate 5 and the slide 21 is achieved via the movement guide 31 is enlarged again, ie in the phase in which the cartridge 50 should actually be clamped against the plate 5, that against the force of the spring 25, the threaded head 15 is pulled out of the opening not in accordance with the regulations and also does not reach the TARGET position TARGET with the transfer anchor 27.
• simple detection of the position of the transmission anchor 13 with respect to the frame 1 can be used to determine whether the connection conditions on the filter cartridge to be tested have been established as for practical use or not.
• a dirty screw connection is shown as a gross leak under leakage test conditions.
• a position detector 57 is connected to the frame 1, which, as shown schematically by the pointer 59, monitors the position of the transmission anchor 13.
• Linear drive 45 for complex motion sequences, namely test chamber closing, screw connection, sealing check also of the outer parts of the seal, which in practice only ensure the seal,

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Dispersion Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Examining Or Testing Airtightness (AREA)

Applications Claiming Priority (1)

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• 1999
  • 1999-08-24 WO PCT/CH1999/000391 patent/WO2000002432A2/de not_active Application Discontinuation
  • 1999-08-24 AU AU52763/99A patent/AU5276399A/en not_active Abandoned
  • 1999-08-24 JP JP2000558706A patent/JP2002542917A/ja not_active Withdrawn
  • 1999-08-24 EP EP99938119A patent/EP1216086A2/de not_active Withdrawn

Non-Patent Citations (1)

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