GB2624944A - Lubricant sealed pump, removable filter and compartment for retaining filter - Google Patents

Lubricant sealed pump, removable filter and compartment for retaining filter Download PDF

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Publication number
GB2624944A
GB2624944A GB2304060.3A GB202304060A GB2624944A GB 2624944 A GB2624944 A GB 2624944A GB 202304060 A GB202304060 A GB 202304060A GB 2624944 A GB2624944 A GB 2624944A
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GB
United Kingdom
Prior art keywords
filter
inlet
inner compartment
retaining
lubricant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
GB2304060.3A
Inventor
Serayet Mickael
Despesse Christophe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leybold France SAS
Original Assignee
Leybold France SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Leybold France SAS filed Critical Leybold France SAS
Publication of GB2624944A publication Critical patent/GB2624944A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/026—Lubricant separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D27/00—Cartridge filters of the throw-away type
    • B01D27/08—Construction of the casing
    • 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
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/001—Filters in combination with devices for the removal of gas, air purge systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002—Casings; Housings; Frame constructions
    • B01D46/0005—Mounting of filtering elements within casings, housings or frames
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/20—Filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/005—Removing contaminants, deposits or scale from the pump; Cleaning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0092—Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
    • F16N39/06—Arrangements for conditioning of lubricants in the lubricating system by filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/24—Tools used for the removal of filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/40—Special measures for connecting different parts of the filter
    • B01D2201/4023—Means for connecting filter housings to supports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0088—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N13/00—Lubricating-pumps

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

A lubricant sealed pump system comprises a lubricant sealed pump and a lubricant reservoir. The reservoir comprises an inner compartment with a filter 10 for filtering lubricant from fluid exhaust from the pump. A filter retaining means 30 is movable between a retaining position where it retains the filter in position and an open position where the filter is not retained within the inner compartment. The retaining means comprises a handle 32 for engagement by an operator to move the retaining means between the retaining position and the open position. The filter comprises protrusions extending from opposing side surfaces between the inlet and the filter material to engage corresponding protrusions 34 on the filter retaining means. The filter retaining means may be pivotably mounted to pivot between the retaining and open positions. Alternatively, the filter retaining means is part of the filter and comprises retaining protrusions for retaining the filter within the inner compartment.

Description

LUBRICANT SEALED PUMP, REMOVABLE FILTER AND COMPARTMENT FOR RETAINING FILTER
FIELD OF THE INVENTION
The field of the invention relates to lubricant or oil sealed pumps and in particular embodiments to the internal components of lubricant reservoirs for such lubricant sealed pumps.
BACKGROUND
io Pumps and in particular rotary vane pumps may operate with a lubricant such as oil providing both lubrication and sealing between the rotor and the stator of the pump.
A lubricant reservoir is associated with the pump as the source of lubricant and lubricant flows from the reservoir to the pump and fluid from the pump is exhausted through the reservoir via a mist filter within the reservoir that acts to remove small droplets of lubricant from the gas to be exhausted. Such lubricant reservoirs are conventionally formed in a single piece from aluminium and there is generally a compartment to retain the mist filter.
Inserting and removing the filters in such pumps can be difficult as it is important that there is a good seal between the filter inlet and the inlet for exhaust fluid to the compartment and it may be difficult to mount the filter such that the seal is effective and once mounted the seal can stick to the receiving area after several months of use making it hard to remove. Furthermore, the space that the filter is retained in may be restricted making it hard to access.
It would be desirable to provide a means for simplifying at least one of inserting, retaining and removing a filter in a lubricant sealed pump.
SUMMARY -2 -
An aspect provides a lubricant sealed pump system comprising: a lubricant sealed pump configured to pump fluid from an inlet to an exhaust; and a lubricant reservoir for retaining lubricant and for supplying lubricant to and receiving fluid to be exhausted from said lubricant sealed pump during operation of said lubricant sealed pump; said lubricant reservoir comprising an inner compartment configured to mount a filter for filtering lubricant from said fluid to be exhausted by said pump, said inner compartment comprising an inlet for receiving said fluid; and a filter mounted in said inner compartment, said filter comprising an inlet providing fluid communication with an internal channel, an outer perimeter of said internal channel being surrounded by filter material; wherein said lubricant sealed pump comprises filter retaining means configured to be movable being a retaining position in which said retaining means retains said filter in a position where an inlet of said filter is aligned and seals with said inner compartment inlet and an open position where said filter is not retained within said inner compartment; said retaining means comprising a handle for engagement by an operator and for causing said retaining means to move between said retaining position and said open position.
It was recognised that the insertion and removal of a filter within a lubricant sealed pump may be difficult in a compact environment with restricted space and that it might be facilitated by the provision of a retaining means with a handle, movement of which causes the retaining means to move from a retaining to an open position. A retaining means is advantageous to keep the filter in position such that seals between the filter and the inner compartment are maintained during use of the pump. Insertion and removal of the filter is facilitated as the handle provides easy access for an operator to change the retaining means to a retaining position on insertion of the filter and later when removal is required from the retaining position to an open position allowing removal of the filter.
In some embodiments the retaining means may be part of the inner compartment, while in others it may be on the filter. In some embodiments the retaining means comprises protrusions that engage with protrusions on the -3 -corresponding element, where the retaining means is mounted on the filter then the protrusions on the filter will move and mate with the protrusions on the inner compartment when the retaining means is moved to the retaining position.
One aspect provides an inner compartment for a lubricant reservoir of a lubricant sealed pump, said lubricant reservoir being configured to mount a filter for filtering lubricant from fluid to be exhausted by said pump; said inner compartment comprising filter retaining means and an inlet for receiving said fluid; said filter retaining means being configured to comprise a retaining position in which said retaining means retains said filter in a position where an inlet of said filter is aligned and seals with said inner compartment inlet and an open position where said filter is not retained within said inner compartment; said retaining means comprising a handle for engagement by an operator and for causing said retaining means to move between said retaining position and said open position.
In some embodiments, said filter retaining means is configured on moving from said open to said retaining position to push said filter inlet towards said sealing position with said inner compartment inlet.
It may be advantageous if on moving from the open to the retaining position the retaining means moves in a direction towards the inner compartment inlet such that it provides a pushing force in this direction on the filter. This eases insertion of the filter as the retaining means will help ensure that the final movement into position is correctly performed and will provide some additional leverage.
In some embodiments, said filter retaining means is configured to bias an inlet of said filter towards said inner compartment inlet when in said retaining position.
By configuring the handle to provide a biasing force when in the retaining position a filter may be mounted within an inner compartment and provided with a known and reproducible biasing force that continuously biases the filter inlet towards the -4 -compartment inlet. Furthermore, as this biasing force is maintained while the retaining means remains in the retaining position during operation of the pump an effective seal is maintained.
In some embodiments, said filter retaining means comprises filter engaging protrusions configured to engage corresponding protrusions on said filter when said retaining means moves from said open to said retaining position.
In some embodiments, said handle of said filter retaining means comprises side io arms mounted to extend on either side of said inner compartment inlet, said filter engaging protrusions extending from an inner surface of each of said side arms.
Having engaging protrusions on either side of the inlet helps to ensure a substantially symmetric force is applied to the filter that helps maintains its 15 alignment.
In some embodiments, said filter retaining means is pivotably mounted to pivot between said retaining position and said open position.
The filter retaining means may be mounted such that it moves in a number of different ways. In some embodiments, it may have a translational linear movement, where it slides to engage the filter protrusions. Where the movement is a vertical movement then the engaging protrusions on the retaining means may comprise sloped surfaces, such that a force in the direction of the inlet is applied as the retaining means slides to the retaining position.
In other embodiments the retaining means may be pivotably mounted, and this may provide for a compact system, where some biasing and pushing forces may be generated on moving to the retaining position.
In some embodiments, said retaining means is configured to pivot about an inlet end of said filter. -5 -
In some embodiments, said filter engaging protrusions comprise curved surfaces facing towards said inlet and configured to engage with correspondingly curved surfaces facing away from said inlet on said corresponding filter protrusions.
Where the retaining means is pivotably mounted curved surfaces may provide effective cooperating surfaces for the protrusions on the retaining means and the filter.
In some embodiments, said filter retaining means further comprises filter ejecting protrusions configured to push said inlet of said filter away from said inlet of said compartment on said filter retaining means moving from said retaining position to said open position.
Where a filter has been in use for a while and needs to be replaced there may be some difficulty in removing the filter where the sealing means has stuck to the receiving area making it hard to remove the filter. Having filter ejecting protrusions on the retaining means provides an effective way of applying force in the desired direction to the filter. The handle is easy to access and may provide some leverage and in conjunction with the ejecting means applies the force in the appropriate direction and position.
In some embodiments, a surface of said filter ejecting protrusions facing away from said inlet is configured to engage with a surface of said filter protrusions facing said inlet on opening of said retaining means.
In some embodiments, an upper face of said inner compartment comprises an opening for receiving said filter said handle of said filter retaining means extending beyond said opening in said open position and not extending beyond said opening in said retaining position. -6 -
Having a handle that is configured when open to extend beyond the opening of the inner compartment allows the cover not to be inadvertently closed when the retaining means is not in the retaining position.
In some embodiments, said retaining means comprising a biasing means configured to bias said retaining means towards said open position when said filter is not within said inner compartment, said biasing means being configured to be retained in a compressed position when said filter is inserted within said inner compartment.
Having a biasing means to bias the retaining means towards the open position when there is not a filter in place again helps avoid the cover being placed on the reservoir when no filter is present.
In some embodiments, said filter retaining means is mounted adjacent to said inner compartment inlet. That is substantially, more than ten times, closer to the inlet than to the other end of the filter.
In some embodiments, said inner compartment comprises guide means adjacent 20 to said inlet configured to cooperate with corresponding guide means on said filter to guide an inlet end of said filter towards said compartment inlet when mounting said filter within said inner compartment.
Insertion of the filter into the inner compartment may be further facilitated by corresponding guide means on the filter and inner compartment. These may be on the lower surface of the inner compartment and filter and they may be in the form of one or more channels on the inner compartment and one or more protrusions on the filter.
In some embodiments, a surface surrounding and adjacent to said compartment inlet is configured to correspond to a surface surrounding and adjacent to said -7 -inlet of said filter, at least one of said corresponding surfaces comprises a region for retaining a sealing means.
The filter inlet should seal with the inlet to the inner compartment such that the exhaust fluid flows into the fluid inlet. Corresponding surfaces one of which comprises a seal may help this. The seal may be retained in an area on the surface, the area may be a groove.
In some embodiments, at least a portion of said corresponding surfaces comprise conical surfaces or portions of conical surfaces.
Cooperating conical surfaces may form effective sealing surfaces that are easier to pull apart when the filter is to be removed. The seal may be particularly effective where the retaining means also provides a biasing force to push the two conical surfaces together.
In other embodiments, at least a portion of said corresponding surfaces comprising cylindrical surfaces Cylindrical surface provide an effective seal without the same requirements for biasing and alignment that conical surfaces have, however, they may be more difficult to separate on removal of the filter.
In some embodiments, said inlet of said compartment is in a side wall of said compartment, in others it may be in a lower surface and there may be an angled channel between the filter inlet and the inlet of the compartment.
A further aspect provides a lubricant sealed pump system comprising: a lubricant sealed pump configured to pump fluid from an inlet to an exhaust; and a lubricant reservoir for retaining lubricant and for supplying lubricant to and receiving fluid to be exhausted from said lubricant sealed pump during operation -8 -of said lubricant sealed pump; said lubricant reservoir comprising an inner compartment according to the one aspect.
In some embodiments, said inner compartment is integral with said reservoir.
In other embodiments, said inner compartment is mounted within said reservoir.
In some embodiments, said inner compartment is plastic. Where the inner compartment is mounted within the reservoir it may be formed of a different material, thus, the reservoir may be cast metal while the inner compartment may be formed of plastic.
In some embodiments, said lubricant reservoir comprises a cover configured to cover said opening of said inner compartment, said cover being configured to push said handle towards said retained position when mounted to said reservoir Having a cover that pushes the handle of the retaining means towards the retained position, helps maintain it in a fully retained state and also provides for a compact system A yet further aspect provides a filter for a lubricant sealed pump for filtering lubricant from fluid exhausted by said pump, said filter comprising an inlet providing fluid communication with an internal channel, an outer perimeter of said internal channel being surrounded by filter material, said filter further comprising protrusions extending from opposing side surfaces of said filter between said inlet and said filter material, said protrusions being configured to engage corresponding protrusions on a filter retaining means within said lubricant sealed pump.
In some embodiments, said protrusions comprise curved surfaces facing away from said inlet. -9 -
In some embodiments, said protrusions extend from a cylindrical surface between said filter inlet and said filter material.
In some embodiments, said filter comprises at least one guide protrusion extending in an axial direction of said channel, said at least one guide protrusion being for engaging with at least one corresponding guide means on a lower surface of an inner compartment of said lubricant sealed pump.
In some embodiments, said filter further comprises a sealing surface surrounding and adjacent to said inlet for sealing with an inlet of an inner compartment of a lubricant reservoir of said lubricant sealed pump, said sealing surface comprising an area for retaining a seal, In some embodiments, at least a portion of said sealing surface forms at least a portion of a cone.
In some embodiments, at least a portion of said sealing surface forms at least a portion of a cylinder.
The sealing surface may be conical or cylindrical. In some embodiments the cross section of the filter adjacent to the inlet may not be circular such that the filter can only be mounted in one orientation, where that is the case, then a portion of the sealing surface may form a portion of a cylinder or cone.
An aspect provides a lubricant sealed pump system according to a further aspect and said filter according to a yet further aspect.
In some embodiments, said lubricant sealed pump system comprises a vacuum pump, in some embodiments a lubricant sealed rotary vane vacuum pump.
An aspect provides an inner compartment according to one aspect and said filter according to a yet further aspect.
-10 -Another aspect provides a filter for a lubricant sealed pump for filtering lubricant from fluid exhausted by said pump, said filter comprising an inlet providing fluid communication with an internal channel an outer perimeter of said internal channel being surrounded by filter material, said inlet being configured when mounted within an inner compartment of a lubricant reservoir of said lubricant sealed pump to align and seal with an inlet aperture in said inner compartment; and filter retaining means said filter retaining means comprising retaining protrusions for retaining said filter within said inner compartment, said filter retaining means being configured to be movable between a retaining position in which said protrusions cooperate with protrusions extending from said inner compartment such that said filter is retained in position and an open position where said filter is not retained within said inner compartment.
In some embodiments the retaining means may be on the filter and cooperate with protrusions on the inner compartment.
In some embodiments said filter retaining means comprises two side walls and a handle, said retaining protrusions extending from an outer surface of each of said two side walls.
In some embodiments, said filter retaining means is mounted to pivot about an inlet end of said filter.
In some embodiments said retaining protrusions comprise curved surfaces, the outer circumference of which is configured to engage with an inner circumference of correspondingly curved surfaces of protrusions extending from inner walls of said inner compartment, such that movement of said retaining means from said open to said retaining position exerts a force on said filter via said inner compartment protrusions towards an inlet aperture of said inner compartment.
Further particular and preferred aspects are set out in the accompanying independent and dependent claims. Features of the dependent claims may be combined with features of the independent claims as appropriate, and in combinations other than those explicitly set out in the claims.
Where an apparatus feature is described as being operable to provide a function, it will be appreciated that this includes an apparatus feature which provides that function or which is adapted or configured to provide that function.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the present invention will now be described further, with reference to the accompanying drawings, in which: Figure 1 shows a filter assembly according to an embodiment; Figure 2 shows a filter assembly within an inner compartment according to an embodiment; and Figure 3 shows a side view of the filter assembly within the inner compartment according to an embodiment; Figure 4 shows a handle with retaining means according to an embodiment; and Figure 5 shows a handle with retaining and ejecting means according to an embodiment.
DESCRIPTION OF THE EMBODIMENTS
Before discussing the embodiments in any more detail, first an overview will be provided.
Inserting and removing filters from lubricant sealed pumps can be hard and tedious. The sealing after multiple months of use can stick to the receiving area making the removing hard by hand. This is mostly due to the piston fitting of the filter. Also the arrangement does not provide much space for placing hands during changing operation. Having a temporary or permanent mean to remove the filter would be helpful to simplify the maintenance.
-12 -A solution is proposed to simplify service and increase accessibility of oil filter during maintenance.
In summary embodiments provide an oil filter retaining means with a handle. In 5 some embodiments there are provided: A conical sealing surface between the filter and oil reservoir to reduce sticking of the seal; Handle and guide to insert and retain the filter in position; Handle to facilitate removal of the filter from the retained position; In some cases the handle can be integrated to the filter; In other cases the handle is integrated to an inner compartment of the lubricant reservoir; Orientation of the inlet of the filter can be different, that is it may be horizontal or it may be angled.
Figure 1 shows a filter 10 having a handle 17 at one end and an inlet 13 at the other. Inlet 13 provides access to an interior channel 11 that runs substantially along the length of the filter and is surrounded by filtering material 18. Gas to be exhausted enters the interior channel 11 and passes out by the filtering material 18. The filtering material retains at least some of the lubricant and the gases pass through for exhaust from the pump.
There are protrusions 19 configured to engage with retaining means within the inner compartment of the lubricant reservoir of the pump and together they retain the filter 10 in position adjacent to the inlet of the inner compartment. The inlet 13 is not a circular inlet but has an asymmetric portion to help align the inlet with the correspondingly shaped inlet of the inner compartment such that it is mounted in a particular orientation. There are sealing means 12, between the inlet 13 and the engaging protrusions 19, that seal to a corresponding surface around the inlet aperture in the inner compartment. Seal 12 is located within a groove on surface 16. Surface 16 is configured to cooperate with a correspondingly shaped surface of the inlet of the inner compartment. The corresponding surfaces may be -13 -conical or they may be cylindrical. In some cases they may form a portion of a cone or a cylinder where the cross section of the inlet channel is not circular adjacent to the inlet, but forms for example a truncated circular cross section with a portion, in this case the upper portion, of the circumference being straight. In such a case the shape of the corresponding inlet surfaces act as keying surfaces only allowing the filter to be mounted in a particular orientation.
Figure 2 shows a filter assembly 10 retained within an inner compartment 20 by retaining means 30. Retaining means 30 comprises a handle 32 that enables a io user to move the retaining means between the open and retaining positions.
There are filter engaging protrusions 34 that extend from the inner surfaces of the side arms of the handle 32 and that engage with the protrusions 19 on the filter and hold it in position against the inlet of the inner compartment. In this embodiment, the retaining means 30 is configured to pivot about the inlet of the inner compartment and a surface of the engaging protrusions 34 is curved and the outer surface of the protrusion 19 on the filter 10 are correspondingly curved and in this way movement of the retaining means from the open to retaining position provides a pushing force on the filter towards the inlet aperture of the inner compartment and when in the retaining position biases the filter against this inlet.
As can be seen the handle 32 when closed is just below the upper surface of inner compartment 20. Thus, when the cover is placed on this inner compartment the handle and retaining means are held in the retaining position.
When the retaining means is in the open position the handle extends above the upper surface and in this way the cover cannot be placed upon the lubricant reservoir unless the retaining means is in the retained position. In some embodiments, the filter engaging protrusions 34 has a biasing means that biases it to the open position unless the filter is in place. In this way the cover cannot be placed on the lubricant reservoir unless the filter is within the inner compartment and the retaining means is in the retained position.
-14 -Although, in this embodiment the retaining means is shown to pivot, in other embodiments it may move laterally and the engaging protrusions may have sloped surfaces to provide the force towards the inlet.
Figure 3 shows a side view of the filter assembly 10 within the inner compartment 20. Compartment 20 has an inlet 28 that the inlet of the filter is pushed against by retaining means 30. In this embodiment, the cover 40 of the lubricant reservoir is shown to be in place pushing the handle 32 of the retaining means 30 into its retaining position. This side view shows the cooperating surfaces of the inlet of the filter assembly and the inlet 28 of the inner compartment. In this embodiment the surface of the inner compartment 27 has a conical portion and cooperates with a conical portion of the surface around the inlet of the filter assembly. Seal 19 is also shown.
In this embodiment, there are alignment features or guide protrusions 24, 25 on the lower surface of the filter assembly 10 that may cooperate with grooves in the base of the inner compartment 20. Inner compartment 20 is sloped such that oil that drips from the draining surface 14 of the filter will go down the slope and exit via the exhaust exit of the inner compartment to be collected in the lubricant reservoir. The exhaust gasses will exit via an exhaust port 23 that at this exhaust outlet connects with.
Figure 4 shows the retaining means 30 of an embodiment. Retaining Means 30, comprises a handle 32 and side arms 36a and 36b. From the inner surface of the side arms filter engaging protrusions 34 extend. These are curved and when the handle moves from the open to the retaining position the protrusions engage with the corresponding protrusions 19 on the filter and bias the inlet of the filter towards the inlet aperture of the inner compartment and hold it biased in position.
Figure 5 shows a further embodiment of retaining means 30, where both filter engaging protrusions 34 and filter ejecting protrusions 35 are provided on the inner surfaces of the two side arms 36a and 36b of the retaining means 30. The -15 -retaining means is mounted to pivot about an axis towards the bottom of the side arms and as it pivots from the retaining to the open position, ejecting protrusions 35 engage with protrusion 19 on the filter and push the filter away from the inlet aperture on the inner compartment. This may help loosen the filter if it has become bonded in position by ageing sealant. The filter can then be removed.
Although examples of the retaining means are shown mounted on the inner compartment of the lubricant reservoir, it would be clear to a skilled person that similar retaining means to those shown in Figures 4 and 5 could be mounted to the filter and engage with protrusions on the inner compartment. In such a case the retaining means would protrude from the outer surface of the side arms and it would be the outer circumference of the protrusions that would cooperate with similarly shaped protrusions extending from the inner side walls of the inner compartment. In this case the protrusions on the retaining means would be closer to the inlet aperture of the inner compartment than the protrusions on the inner side walls when the filter was mounted in the inner compartment, such that the force exerted on the filter by the retaining means pivoting and interacting with the inner compartment protrusions would be towards the inlet aperture of the inner compartment.
In summary different embodiments may provide:
A filter interface sealing surface that is at least partially conical of sloped for simplifying the insertion and reducing the retaining force.
Guides and corresponding protrusions on the inner compartment walls and filter to allow the filter to slot into place.
The filter is mounted and retained in position by a handle on retaining means. The handle is rotatable as a cam to insert and retain the filter in position The filter can also be removed by the handle in certain embodiments.
Advantages of the arrangements include: Plug and play solution easy fitting of the filer.
-16 -Low force of insertion thanks to the handle and in some embodiments the conical fit Reduced risk of having the filter sticking to the socket thanks to the conical connection.
Only one orientation possible on insertion.
Reduced price thanks to plastic parts.
Although illustrative embodiments of the invention have been disclosed in detail herein, with reference to the accompanying drawings, it is understood that the io invention is not limited to the precise embodiment and that various changes and modifications can be effected therein by one skilled in the art without departing from the scope of the invention as defined by the appended claims and their equivalents.
-17 -
REFERENCE SIGNS
filter 11 interior channel 12 seal 13 filter inlet 14 draining surface 17 handle 18 filter material 19 protrusion io 20' inner compartment 23 exhaust outlet 24 alignment feature alignment feature 27 conical surface 28 inner compartment inlet retaining means 32 handle 34 filter engaging protrusions filter ejecting protrusions 36a, b side arms 40 cover

Claims (25)

  1. -18 -CLAIMS1. A lubricant sealed pump system comprising: a lubricant sealed pump configured to pump fluid from an inlet to an exhaust. and a lubricant reservoir for retaining lubricant and for supplying lubricant to and receiving fluid to be exhausted from said lubricant sealed pump during operation of said lubricant sealed pump; said lubricant reservoir comprising an inner compartment configured to io mount a filter for filtering lubricant from said fluid to be exhausted by said pump, said inner compartment comprising an inlet for receiving said fluid; and a filter mounted in said inner compartment, said filter comprising an inlet providing fluid communication with an internal channel, an outer perimeter of said internal channel being surrounded by filter material; wherein said lubricant sealed pump comprises filter retaining means configured to be movable being a retaining position in which said retaining means retains said filter in a position where an inlet of said filter is aligned and seals with said inner compartment inlet and an open position where said filter is not retained within said inner compartment; said retaining means comprising a handle for engagement by an operator and for causing said retaining means to move between said retaining position and said open position.
  2. 2. An inner compartment for a lubricant reservoir of a lubricant sealed pump, said lubricant reservoir being configured to mount a filter for filtering lubricant from fluid to be exhausted by said pump; said inner compartment comprising filter retaining means and an inlet for receiving said fluid; said filter retaining means being configured to be movable between a retaining position in which said retaining means retains said filter in a position where an inlet of said filter is aligned and seals with said inner compartment inlet -19 -and an open position where said filter is not retained within said inner compartment; said retaining means comprising a handle for engagement by an operator and for causing said retaining means to move between said retaining position and said open position.
  3. 3. An inner compartment according to claim 2, wherein said filter retaining means is configured on moving from said open to said retaining position to push said filter inlet towards said sealing position with said inner compartment inlet.
  4. 4. An inner compartment according to claim 2 or 3, wherein said filter retaining means is configured to bias an inlet of said filter towards said inner compartment inlet when in said retaining position.
  5. 5. An inner compartment according to any one of claims 2 to 4, wherein said filter retaining means comprises filter engaging protrusions configured to engage corresponding protrusions on said filter when said retaining means moves from said open to said retaining position.
  6. 6. An inner compartment according to claim 5, wherein said handle of said filter retaining means comprises side arms mounted to extend on either side of said inner compartment inlet, said filter engaging protrusions extending from an inner surface of each of said side arms.
  7. 7. An inner compartment according to any one of claims 2 to 6, wherein said filter retaining means is pivotably mounted to pivot between said retaining position and said open position.
  8. 8. An inner compartment according to claim 7 when dependent on any one of claims 5 or 6, wherein said filter engaging protrusions comprise curved surfaces facing towards said inlet and configured to engage with correspondingly curved surfaces facing away from said inlet on said corresponding filter protrusions.
  9. -20 - 9. An inner compartment according to any one of claims 5 to 8, wherein said filter retaining means further comprises filter ejecting protrusions configured to push said inlet of said filter away from said inlet of said compartment on said filter retaining means moving from said retaining position to said open position.
  10. 10. An inner compartment according to claim 9, wherein a surface of said filter ejecting protrusions facing away from said inlet is configured to engage with a surface of said filter protrusions facing said inlet on opening of said retaining 10 means.
  11. 11. An inner compartment according to any preceding claim, wherein an upper face of said inner compartment comprises an opening for receiving said filter said handle of said filter retaining means extending beyond said opening in said open position and not extending beyond said opening in said retaining position.
  12. 12. An inner compartment according to claim 11, said retaining means comprising a biasing means configured to bias said retaining means towards said open position when said filter is not within said inner compartment, said biasing means being configured to be retained in a compressed position when said filter is inserted within said inner compartment.
  13. 13. An inner compartment according to any one of claims 2 to 12, wherein said inner compartment comprises guide means on a lower surface of said inner compartment adjacent to said inlet configured to cooperate with corresponding guide means on said filter to guide an inlet end of said filter towards said compartment inlet when mounting said filter within said inner compartment.
  14. 14. An inner compartment according to any one of claims 2 to 13, wherein a surface surrounding and adjacent to said compartment inlet is configured to correspond to a surface surrounding and adjacent to said inlet of said filter, at -21 -least one of said corresponding surfaces comprises a region for retaining a sealing means.
  15. 15. An inner compartment according to claim 14, wherein at least a portion of said corresponding surfaces comprise one of portions of conical surfaces or portions of cylindrical surfaces.
  16. 16. A lubricant sealed pump system comprising: a lubricant sealed pump configured to pump fluid from an inlet to an io exhaust; and a lubricant reservoir for retaining lubricant and for supplying lubricant to and receiving fluid to be exhausted from said lubricant sealed pump during operation of said lubricant sealed pump; said lubricant reservoir comprising an inner compartment according to any one of claims 2 to 15.
  17. 17. A lubricant sealed pump system according to claim 16, comprising an inner compartment according to claim 11 or 12, wherein said lubricant reservoir comprises a cover configured to cover said opening of said inner compartment, said cover being configured to push said handle towards said retained position when mounted to said reservoir
  18. 18. A filter for a lubricant sealed pump for filtering lubricant from fluid exhausted by said pump, said filter comprising an inlet providing fluid communication with an internal channel, an outer perimeter of said internal channel being surrounded by filter material, said filter further comprising protrusions extending from opposing side surfaces of said filter between said inlet and said filter material, said protrusions being configured to engage corresponding protrusions on a filter retaining means within said lubricant sealed pump.-22 -
  19. 19. A filter according to claim 18, wherein said protrusions comprise curved surfaces facing away from said inlet.
  20. 20. A filter according to claim 18 or 19, wherein said protrusions extend from a cylindrical surface between said filter inlet and said filter material.
  21. 21. A filter according to any one of claims 18 to 20, wherein said filter comprises at least one guide protrusion extending in an axial direction of said channel, said at least one guide protrusion being for engaging with at least one corresponding guide means on a lower surface of an inner compartment of said lubricant sealed pump.
  22. 22. A filter according to any one of claims 18 to 21, said filter further comprising a sealing surface surrounding and adjacent to said inlet for sealing with an inlet of an inner compartment of a lubricant reservoir of said lubricant sealed pump, said sealing surface comprising an area for retaining a seal,
  23. 23. A filter according to claim 22, wherein at least a portion of said sealing surface is conical or cylindrical.
  24. 24. A filter for a lubricant sealed pump for filtering lubricant from fluid exhausted by said pump, said filter comprising: an inlet providing fluid communication with an internal channel, an outer perimeter of said internal channel being surrounded by filter material, said inlet being configured when mounted within an inner compartment of a lubricant reservoir of said lubricant sealed pump to align and seal with an inlet aperture in said inner compartment; and filter retaining means, said filter retaining means comprising retaining protrusions for retaining said filter within said inner compartment, said filter retaining means being configured to be movable between a retaining position in which said protrusions cooperate with protrusions extending from said inner -23 -compartment such that said filter is retained in position and an open position where said filter is not retained within said inner compartment.
  25. 25. A lubricant sealed pump system according to any one of claims 16 to 17 and comprising said filter of any one of claims 18 to 23.
GB2304060.3A 2022-11-30 2023-03-21 Lubricant sealed pump, removable filter and compartment for retaining filter Pending GB2624944A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22306765 2022-11-30

Publications (1)

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GB (1) GB2624944A (en)
WO (1) WO2024115590A1 (en)

Citations (2)

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Publication number Priority date Publication date Assignee Title
WO2018197614A1 (en) * 2017-04-28 2018-11-01 Leybold Gmbh Filter system
US20220099093A1 (en) * 2019-03-06 2022-03-31 Gebr. Becker Gmbh Oil-lubricated rotary vane vacuum pump

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Publication number Priority date Publication date Assignee Title
US7160447B2 (en) * 2002-12-23 2007-01-09 Purolator Filters Na Llc Fluid filtration system including replaceable filter module
BRPI0610315A2 (en) * 2005-05-16 2010-06-15 3M Innovative Properties Co spool valve pipe interconnect to a filter system
US9757670B2 (en) * 2013-10-31 2017-09-12 Pall Corporation Methods for moving a filter along a manifold assembly; filter arrangements including a filter and a manifold assembly; and filters
EP4178705A4 (en) * 2020-07-10 2024-05-22 Entegris, Inc. Connection assembly and filter assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018197614A1 (en) * 2017-04-28 2018-11-01 Leybold Gmbh Filter system
US20220099093A1 (en) * 2019-03-06 2022-03-31 Gebr. Becker Gmbh Oil-lubricated rotary vane vacuum pump

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