CA2011129A1 - Adapter assembly for a filter arrangement - Google Patents
Adapter assembly for a filter arrangementInfo
- Publication number
- CA2011129A1 CA2011129A1 CA 2011129 CA2011129A CA2011129A1 CA 2011129 A1 CA2011129 A1 CA 2011129A1 CA 2011129 CA2011129 CA 2011129 CA 2011129 A CA2011129 A CA 2011129A CA 2011129 A1 CA2011129 A1 CA 2011129A1
- Authority
- CA
- Canada
- Prior art keywords
- adapter plate
- filter
- fluid
- hub
- filter unit
- 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.)
- Abandoned
Links
Landscapes
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
ABSTRACT
ADAPTER ASSEMBLY FOR A FILTER ARRANGEMENT
A filter unit is mounted on a filter pad by means of an adapter assembly. The adapter assembly has an adapter plate and a threaded hub which engages with a threaded nipple of the filter pad. The filter unit engages with threads formed on the hub which have the same pitch as the threads of the nipple. The adapter plate has an orifice into which a differential pressure sensor can be housed for measuring the difference between the pressure of inflowing and outflowing oil. Individual sampling ports are provided in the adapter plate for allowing inflowing and outflowing oil to be separately sampled.
ADAPTER ASSEMBLY FOR A FILTER ARRANGEMENT
A filter unit is mounted on a filter pad by means of an adapter assembly. The adapter assembly has an adapter plate and a threaded hub which engages with a threaded nipple of the filter pad. The filter unit engages with threads formed on the hub which have the same pitch as the threads of the nipple. The adapter plate has an orifice into which a differential pressure sensor can be housed for measuring the difference between the pressure of inflowing and outflowing oil. Individual sampling ports are provided in the adapter plate for allowing inflowing and outflowing oil to be separately sampled.
Description
`` 20~1~29 ADAPTER ~SSEMBLY FOR A FILTER AR~ANGEMENT
The present invention relates to the measurement of pressure differentials across filters in fluid systems. More particularly, it relates to the measurement of the pressure differential across the filter element of a spin-on type filter mounted on a filter pad, such as frequently is utilized in fuel supply, hydraulic, and lubrication systems of an engine or transmission.
Engine oil lubrication systems, which are typical of many fluid systems, frequently utilize a spin-on type filter unit which is mounted on a filter pad and which includes a filter element to remove potentially damaging particles from the oil. Mechanical wear within the engine, the outside environment, and contaminants introduced accidentally during normal servicing are sources of particles which may plug lubricating nozzles, severely damage parts, and create excessive wear on any surfaces relying on a thin film of lubricating oil for protection.
These systems typically utilize a pump to force oil to circulate through the filter pad and spin-on filter unit assembly and then to the moving parts of the engine for lubrication. Oil is forced through the filter element due to a difference in oil pressure, i.e., a pressure differential, between the upstream and downstream sides of the filter element, the pressure on the upstream side being greater than the pressure on the downstream side.
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The present invention relates to the measurement of pressure differentials across filters in fluid systems. More particularly, it relates to the measurement of the pressure differential across the filter element of a spin-on type filter mounted on a filter pad, such as frequently is utilized in fuel supply, hydraulic, and lubrication systems of an engine or transmission.
Engine oil lubrication systems, which are typical of many fluid systems, frequently utilize a spin-on type filter unit which is mounted on a filter pad and which includes a filter element to remove potentially damaging particles from the oil. Mechanical wear within the engine, the outside environment, and contaminants introduced accidentally during normal servicing are sources of particles which may plug lubricating nozzles, severely damage parts, and create excessive wear on any surfaces relying on a thin film of lubricating oil for protection.
These systems typically utilize a pump to force oil to circulate through the filter pad and spin-on filter unit assembly and then to the moving parts of the engine for lubrication. Oil is forced through the filter element due to a difference in oil pressure, i.e., a pressure differential, between the upstream and downstream sides of the filter element, the pressure on the upstream side being greater than the pressure on the downstream side.
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function, the filter element of the spin-on filter unit becomes plugged by particles removed from the lubricating oil. As the amount of material filtered from the lubricating oil and retained by the filter element increases, a greater pressure dif~erential across the filter element is required to pump sufficient fluid through the filter element. The amount of lubricating oil which will pass through the filter element at the maximum pumping pressure will decrease until flow is insufficient to maintain proper lubrication of the engine. To prevent tha-t occurrence, many lubrication systems include a pressure-sensitive bypass valve which will open when the pressure differential across the filter element approaches that corresponding to the maximum pumping pressure, allowing oil to bypass the filter element. This assures that lubricating oil will continue to reach the moving parts of the engine but eliminates, at least in part, the filtering function.
Thus, to assure that sufficient filtered oil continues to reach the moving parts of the engine, filter units must be replaced before they become so clogged as to cause the bypass valve to open. As few lubrication systems are equipped to monitor the pressure differential across the filter element to determine when the filter unit should be replaced, the spin-on filter units are replaced at regular intervals of operation. Although the rate at which a filter element becomes blocked will vary greatly depending upon operating conditions for the engine, the filter unit replacement interval must be selected to be the shortest : .~
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probable time in which excessive blockage may occur to assure continuous prop~r lubrication system function. This results in the frequent disposal of filter units before thPir filtering capacity has been fully utilized, resu:Lting in higher operational costs.
Some lubrication systems utilizing spin-on filter units include a pressure detector which senses the pressure only on the high pressure side, i.e., the upstream side, of the filter. The detector may be used to operate a filter blockage warning light when the upstream pressure becomes greater than a predetermined amount, e.g., approaches maximum pumping pressure. However, the pressure on the upstream side of the filter element is dependent on the overall lubrication system pressure and cumulative pressure drop through the system and is not necessarily indicative of the filter condition. Thus, such a detector may result in a false indication of the need to replaca a filter element if the system becomes blocked downstream of the filter unit.
Few new engines have lubrication systems equipped with a pressure differential monitor because of the expense of providing instrumentation to measure pressure on both the upstream and downstream sides of the filter element and determine the difference between the two. The difficulty of accommodating such a monitoring system within the confines of the lubrication systems is also an important factor. Retrofit of existing engines to provide for monitoring of the differential pressure across the filter element of the lubrication system is particularly difficult 29737 -3~
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if pressure-sensing devices must be installed within the crankcase together with leads for app~ priate instrumentation~
u.s. Patent No. 4,783,~256, which is assigned to the assignee of the present invention, discloses an adapter assembly for a lubrication system which overcomes the above-described problems and permits convenient measurement of the pressure differential across an oil filter during use. The adapter assembly has an adapter plate which is mounted on an engine between a filter pad of an engine and an oil filter. The adapter plate is secured to the filter pad by a cylindrical threaded hub which extends through the center of the adapter. One end of the hub screws into the filter pad, and the oil filter screws onto threads formed on the other end of the hub. The adapter plate has an orifice which connects between the inlet side and the outlet side of the oil filter. A differential pressure sensor can be inserted into the orifice in order to measure the pressure differential between the inlet and outlet sides of the oil filter. Based on the pressure differential which is measured by the sensor, it can be determined when the oil filter has become plugged.
The filter pad of a conventional lubrication system is generally equipped with a threaded nipple on which an oil filter can be mounted. In order to retrofit an existing engine with the adapter assembly disclosed in U.S. Patent No. 4,783,256, it is necessary to first remove the nipple of the filter pad and replace it with the threaded hub of the adapter assemblyO The necessity of removing the nipple makes installation of the adapter assembly 29737 ~4~
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on an existing lubrication system somewhat troublesome.
~urthermore, there is little standardization of the pitch of the threads of the hole in the Eilter pad into which the hub of the adapter assembly is screwed, so in order for the adapter assembly to be applicable to a large number of different types of lubrication systems, it is necessary to manufacture many different hu~s having thread pitches corresponding to the various thread pitches of the filter pads. In addition, the above-described adapter plate has no provision for sampling oil from individual oil passages, such as from an oil inlet passage or an oil outlet passage. Therefore, it is impossible to sample oil flowing through the filter during the operation of an engine or to test the differential pressure sensor without removing it from the adapter plate.
Accordingly, the present invention provides an adapter assembly for a fluid system having a spin-on filter unit which has a base with a fluid inlet and a fluid outlet and a filter element disposed in a fluid flow path between the inlet and the outlet and which is attachable to a filter pad having an inlet chamber and an outlet chamber and a nipple on which the filter unit can be mounted, the adapter assembly comprising an adapter plate having a first side, a second side, and an aperture to allow fluid to flow from the inlet chamber of the filter pad to the inlet of the filter unit; a hub detachably mounted on the adapter plate and having a first end and a second end and including means for detachably connecting the first end of the hub to the nipple of -`,' `' ` `
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the filter pad, means Eor detachably connecting the second end o~
the hub to the filter unit, means for retaining the first side of the adapter plate in sealed engagement with the filter pad, means for retaining the base of the filter unit in sealed engagement with the second side of the adapter plate, and a fluid channel to allow fluid to flow from the outlet of the filter unit to the outlet chamber of the filter pad; connecting means for connecting a differential pressure detector to the adapter plate, the connecting means including a detector orifice; a firs~ passage communicating between the aperture in the adapter plate and the detector orifice; and a second passage communicating between the channel in the hub and the detector orifice, the adapter plate having at least one sampling port formed therein which communicates between an outer surface of the adapter plate and an inner portion of the adapter plate through which fluid can flow.
The present invention further provides an adapter assembly for a fluid system having a spin-on filter unit which has a base with a fluid inlet and a fluid outlet and a filter element disposed in a fluid flow path between the inlet and the outlet and which is attachable to a filter pad having an inlet chamber and an outlet chamber and a nipple on which the filter unit can be m~unted, the adapter assembly comprising an adapter plate including a ring-shaped outer portion, a ring-shaped inner portion which is coaxial with the outer portion, at least one spoke which extends between the inner and outer portions, a first side and a second side, a central aperture, and an outer aperture to allow i:
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fluid to flow from the inlet chamber of the filter pad to the inlet of the filter unit; a hub detachably mounted inside the central aperture of the adapter plate and having a first end and a second end and including means for detachably connecting the first end of the hub to the nipple of the filter pad, means for detachably connecting the second end of the hub to the filter unit, means for retaining the first side of the adapter plate in sealed engagement with the filter pad, means for retaining the base of the filter unit in sealed engagement with the second side of the adapter plate, and a fluid channel to allow fluid to flow from the outlet of the filter unit to the outlet chamber of the filter pad; connecting means for connecting a differential pressure detector to the adapter plate, the connecting means including a detector orifice which extends into the adapter plate from a peripheral edge thereof and having an axis extending radially inward toward the center of the adapter plate; a first passage communicating between the aperture in the adapter plate and the detector orifice; a second passage communicating between the channel in the hub and the detector orifice and extending radially through the spoke coaxially with respect to the detector orifice; a first sampling port formed in the adapter plate which communicates between the aperture in the adapter plate and an outer surface of the adapter plate; and a second sampling port formed in the adapter plate which communicates between the channel in the hub and the outer surface of the adapter plate.
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The present invention thus provides a convenient, effective and economical way to allow monitoring of the pressure differential across the filter element of either a new or existing system utilizin~ a spin-on filter mounted on a ~ilter pad. For example, the present invention may provide input for an indicator to be used to warn of clogged filter elements 50 that operation of an engine with the bypass valve open may be avoided yet filters may be used to their full capacity for greatest economy.
Other objects, advantages, and aspects of the present invention will become apparent upon reading the following detailed description and appended claims and upon reference to the accompany drawings.
Figure 1 is a longitudinal cross-sectional view of an exemplary adapter assembly embodying the present invention as shown mounted between a spin-on filter unit and a filter pad.
Figure 2 is a plan view of the adapter plate of the exemplary adapter assembly of Figure 1.
As shown in Figure 1, a filter arrangement 10 according to the present invention has a filter pad 12 which is equipped with a hollow, threaded nipple 13. The nipple 13 has external threads formed on both ends thereof. The external threads 25 on the left end of the nipple 13 in Figure 1 screw into corresponding internal threads formed in the filter pad 12. The filter pad 12 defines separate inlet and outlet chambers 23, 24 which are respectively coupled to inlet and outlet lines or ports (not shown) of a fluid system such as a hydraulic or lubrication oil system. A flat ,~ 'y ~รง
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seating surface 30 is formed on an end surface of the filter pad 12 for the adapter assembly to seat against.
The adapter assembly 100 generally comprises a hollow, threaded hub lol and an adapter plate 102. The hub 101, which may be fashioned from any suitable rigid impervious material compatible with the fluid being filtered, has a generally tubular body 103 defining a central channel 104. A first end 105 of the hub 101 has internal threads which engage the external threads of right end of the nipple 13 in Figure 1. A flange 107 extends radially outwardly from the tubular body 103 at a position near the second end 106 of the hub 101. Flats are preferably formed along the periphery of the flange 107, allowing engagement by a wrench to tighten the hub 101 onto the nipple 13 to an appropriate degree of torque. A fluid passage 108 extends through the tubular body 103 at a position between the first end 105 of the hub 101 and the flange 107.
The adapter plate 102, which also may be fashioned from any suitable rigid impervious material compatible with the fluid being filtered, preferably has a circular form, as shown in Figure 2, generally comprising first and second sides 109, llO and a peripheral edge 111. The adapter plate 102 includes a ring-shaped inner portion 112 held in fixed coaxial relation with a ring-shaped outer portion 113 by several spokes 114. The inner portion 112 defines a central aperture 115 on the inner periphery of which is formed a circumferentially-extending groove 116. The outer portion 113 includes first and second end faces 117 and 118.
29737 _9_ , - 2 ~ 2 9 The first end face 117, which has mounted on it a circular seal 120, such as the groove and 0-ring arrangement illustrated in Figure 1, has a diameter similar to that of the seating surface 30 of the filter pad 12. The spokes 114 define several apertures 121 between the inner and outer portions l:L2, 113 of the adapter plate 102.
A conventional filter unit 11 is mounted on the second end face 118 of the adapter plate 102. The filter unit 11 typically includes a housing 14 which is sealed to the periphery of an attachment plate or base 15 and which contains a hollow, cylindrical filter element 16. The filter element 16 is mounted concentrically on one side of the base 15 while a seal 20 is mounted concentrically on the opposite side of the base 15. The base 15 includes a central outlet hole 21 and several inlet holes 22 positioned between the outlet hole 21 and the seal 20. The base 15 has internal threads formed thereon which engage with the external threads formed on the second end 106 of the hub 101.
To allow detection of the differential pressure across the filter element 16, the adapter plate 102 further includes a fitting 122 to which a differential pressure detector ~not shown) may be mounted. In the exemplary adapter assembly 100, the fitting 122 generally comprises an orifice 123 which is formed in the peripheral edge 111 of the adapter plate 102 and extends radially inwardly through the ring-shaped outer portion 113 into a spoke 114. The detector, which may comprise any suitable conventional device, such as those available from Pall Corporation . . . ~. .,. , , ~ , ,, :
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under the trademarks DELTAMYND or DELTADYNE, may be mounted within the orifice 123, by bolts (not shown), for example, which cooperate with tapped holes 12~ in the outer portion 113.
Alternatively, the detector may be mou:nted by means of a retaining ring or threaded fitting. A first fluid passage 125 communicates between an outer section of the detector orifice 123 and the space 126 between the inner and outer portio:ns 112, 113 of the adapter plate 102, which space 126 includes thle apertures 121. A second fluid passage 127 communicates between the circumferential groove 116 of the central aperture 115 and an inner section of the detector orifice 123. However, the locations at which the first and second passages 125, 127 intersect the detector orifice 1~3 as well as the shape of the detector orifice 123 may vary depending on the particular differential pressure detector being used.
As shown in Figure 2, the adapter plate 102 is further equipped with a first sampling port 130 and a second sampling port 131 which enable independent sampling of oil flowing into the filter unit 11 and oil leaving the filter unit 11. The first sampling port 130 is a countersunk orifice which extends through the outer portion 113 of the adapter plate 102. Its outer end opens onto the peripheral edge 111 and its inner end opens onto one of the apertures 121. The second sampling port 131 is a countersunk orifice which is formed in the outer portion 113 and extends radially through one of the spokes 114. Its outer end opens onto the peripheral edge 111 of the adapter plate 102 while its inner end opens onto the circumferential groove 116. The 29737 ~
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second sampling port 131 communicates with the central channel 10 of the hub 101 via the circumferential groove 116 and ~luid passage 108 of the hub 101. Each sampling port is shaped so as to receive a corresponding pressure sensox or other measurement device. When not in use, the sampling ports can be sealed by suitable, unillustrated plugs.
The sampling ports and the orifice 123 are suitably spaced around the circumference of the adapter plate 102 so as not to interfere with one another. For example, in Figure 2, the first sampling port 130 is disposed 45 on one side of the axis of the detector orifice 123 and the second sampling port 131 is disposed 120 on the opposite side of the axis of the detector orifice 123.
Although Figure 2 illustrates two sampling ports, it is also possible to employ a single sampling port which communicates with either the circumferential groove 116 or with one of the apertures 121.
In a conventional filter arrangement, the filter unit 11 would be mounted directly on the threaded nipple 13. The exemplary adapter assembly 100 can be easily installed on such a conventional filter arrangement in the following manner. First, the spin-on filter unit 11 is removed from the filter pad 12 by unscrewing it from the threaded nipple 13.
Next, the adapter assembly 100 with the differential pressure detector installed in the fitting 122 is mounted on the filter pad 12. For example, the first end 105 of the hub 101 may be passed through the central aperture 115 of the adapter plate 102 until ' : ' , .
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the flange 107 engages the ring-shaped inner portion 112 of the adap-ter plate 102. In this position, the fluid passac~e 10~ of the hub lO1 communicates between the central channel 104 and the circumferential groova 116 of the central aperture 115 of the adapter plate 102, the circumferential groove 116 providing positive relief from the hub 101 along its axial span. The internal threads of the first end 105 of the hub 101 can then be loosely engaged in with the external threads of the right end of the nipple 13, and the adapter plate 102 can be rotated about the hub lO1 to locate the fitting 122 in any desired position. With the adapter plate 102 held in position, the hub 101 can then be tightened to the nipple 13 by means of the flats on the flange 107. By the action of the flange 107 against the inner ring-shaped portion 112 of the adapter plate 102, the first side 109 of the adapter plate 102 may be drawn to and retained against the filter pad 12 with the seal 120 on the adapter plate 102 sufficiently sealed against the seating surface 30 of the filter pad 12.
In the illustrated embodiment, the adapter plate 102 is shaped such that it can be reversibly mounted on the filter pad 12. Namely, in Figure 1, the first side 109 of the adapter plate 102 contacts the seating surface 30 of the filter pad 12 and the second side 110 contacts the base 15 of the filter unit 11.
However, if a circular seal 120 or the like is provided on the second side 110, the orientation of the adapter plate 102 can be reversed so that the first side 109 confronts the base 15 of the ~, :, , , : :. :: . :
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filter unit 11 and the second side llO contacts the seating surface 30. The ability to reverse the orientation o~ the adapter plate 102 makes it easier to install on a filter pad 12.
Although an adapter assembly according to the present invention may have a one-piece structure, the two-piece arrangement comprising the hub 101 and adapter plate 102 of the first exemplary assembly 100 is particularly advantageous.
Because the circumferential groove 116 of the central aperture 115 enables the fluid passage 108 in the hub 101 to communicate with the second fluid passage 127 in the adapter plate 102 regardless of their relative angular orientation, the adapter plate 102 may be positioned in any desired angular (i.e., universal) orientation about the hub 101 independent of the angular orientation of the hub 101 required to sufficiently tighten the hub 101 to the filter pad 12. This is important when the available space is limited or when the differential pressure detector is visible only at a particular orientation.
Once the exemplary adapter assembly 100 is mounted on the filter pad 12, the spin-on filter unit 11 may be mounted on the second side 110 of the adapter plate 102 by engaging the threads 26 on the base 15 of the filter unit ll with the external threads on the second end 106 of the hub 101. The filter unit 11 is then tightened onto the hub 101 until the seal 20 on the base 15 of the filter unit is sufficiently sealed against the second end face 118 of the ring-shaped outer portion 113 of the adapter plate 102.
Replacement of the filter unit 11 simply requires unscrewing the 2 ~
old filter unit 11 from the hub 101 of the adapter assembly 100 and then screwing a new filter unit 11 onto the hub 101.
In the preferred mode of operation, fluid at a pressure P1 may be forced into the inlet chamber 23 oE the filter pad 12.
From the inlet chamber ~3, fluid flows through the space 126 between the inner and outer ring-shaped portions 112, 113. Seals 130, such as the groove and 0-ring arrangements, between the hub 101 and the adapter plate 102 on both sides of the circumferential groove 116 of the central aperture 115 prevent the fluid from flowing directly into the hub 101 and bypassing the filter element 16. From the space 126, the fluid flows through the inlet holes 22 in the base 15 of the filter unit 11, into the space between the housing 14 and the filter element 16, and radially inwardly through the filter element 16 where any harmful particles are filtered from the fluid and the pressure of the fluid drops from Pl to P2. Filtrate at pressure P2 then flows from the interior of the filter element 11 through the central channel 104 of the hub 101 into the outlet chamber 24 of the filter pad 12.
The differential pressure across the filter element 16 may be detected by the differential pressure detector (not shown) by means of the adapter assembly 100. The upstream high pressure fluid is channeled to the differential pressure detector via the first fluid passage 125, communicating the pressure Pl to the differential pressure detector. The downstream low pressure fluid is channeled to the differential pressure detector via the fluid passage 108 in the hub 101, the circumferential groove 116 of the , . .. . ... .
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central aperture 115, and the second fluid passage 126 in the adapier plate 102, communicating the pressure P2 to the differential pressure detector. Thus, the seals 130 further isolate the fluid communication between the central channel 104 of the hub 101 and the detector orifice 123.
The sampling ports 130 and 131 can be advantageously employed for a variety of purposes. For example, the first sampling port 130 can be used to sample fluid from the upstream side of the filter unit 11 to determine whether the engine or other device on which the filter pad 12 is mounted is discharging solid particles, which are an indication of engine wear. Also, the pressure between the first sampling port 130 on the upstream side of the filter unit 11 and the second sampling port 131 on the downstream side can be measured to determine whether the differential pressure detector which is installed in the detector orifice 123 is functioning properly. If the sampling p~rts were not provided, the differential pressure detector could only be inspected after being removed from the orifice 123. The sampling ports also make it possible to investigate the viscosity, the temperature, or other characteristics of the fluid being filtered on either the upstream or downstream sides of the filter unit 11 during operation of an engine.
The pitch of the internal threads of the filter pad 12 which engage with the external threads 25 of the nipple 13 will vary considerably among fluid systems. However, the adapter plate 102 may be fairly standard for various filter manufacturers.
201 1 ~29 Accordingly, only one type of adapter plate may be necessary to enable the present invention to be employed with a large number of different fluid systems. Furthermore, since it is not necessary to remove the nipple 13 fxom the filter pad 12, the adapter assembly 100 can be installed on an existing fluid system extremely easily.
While an exemplary adapter assemb:Ly embodying the present invention have been shown, it will be understood, of course, that the present invention is not limited to those embodiments.
Modification may be made by those skil:Led in the art, particularly in light of the foregoing teaching. It is, thereforQ, contemplated by the appended claims to cover any such modification which incorporates the essential features of this invention or encompasses the true spirit and scope of the present invention.
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function, the filter element of the spin-on filter unit becomes plugged by particles removed from the lubricating oil. As the amount of material filtered from the lubricating oil and retained by the filter element increases, a greater pressure dif~erential across the filter element is required to pump sufficient fluid through the filter element. The amount of lubricating oil which will pass through the filter element at the maximum pumping pressure will decrease until flow is insufficient to maintain proper lubrication of the engine. To prevent tha-t occurrence, many lubrication systems include a pressure-sensitive bypass valve which will open when the pressure differential across the filter element approaches that corresponding to the maximum pumping pressure, allowing oil to bypass the filter element. This assures that lubricating oil will continue to reach the moving parts of the engine but eliminates, at least in part, the filtering function.
Thus, to assure that sufficient filtered oil continues to reach the moving parts of the engine, filter units must be replaced before they become so clogged as to cause the bypass valve to open. As few lubrication systems are equipped to monitor the pressure differential across the filter element to determine when the filter unit should be replaced, the spin-on filter units are replaced at regular intervals of operation. Although the rate at which a filter element becomes blocked will vary greatly depending upon operating conditions for the engine, the filter unit replacement interval must be selected to be the shortest : .~
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probable time in which excessive blockage may occur to assure continuous prop~r lubrication system function. This results in the frequent disposal of filter units before thPir filtering capacity has been fully utilized, resu:Lting in higher operational costs.
Some lubrication systems utilizing spin-on filter units include a pressure detector which senses the pressure only on the high pressure side, i.e., the upstream side, of the filter. The detector may be used to operate a filter blockage warning light when the upstream pressure becomes greater than a predetermined amount, e.g., approaches maximum pumping pressure. However, the pressure on the upstream side of the filter element is dependent on the overall lubrication system pressure and cumulative pressure drop through the system and is not necessarily indicative of the filter condition. Thus, such a detector may result in a false indication of the need to replaca a filter element if the system becomes blocked downstream of the filter unit.
Few new engines have lubrication systems equipped with a pressure differential monitor because of the expense of providing instrumentation to measure pressure on both the upstream and downstream sides of the filter element and determine the difference between the two. The difficulty of accommodating such a monitoring system within the confines of the lubrication systems is also an important factor. Retrofit of existing engines to provide for monitoring of the differential pressure across the filter element of the lubrication system is particularly difficult 29737 -3~
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if pressure-sensing devices must be installed within the crankcase together with leads for app~ priate instrumentation~
u.s. Patent No. 4,783,~256, which is assigned to the assignee of the present invention, discloses an adapter assembly for a lubrication system which overcomes the above-described problems and permits convenient measurement of the pressure differential across an oil filter during use. The adapter assembly has an adapter plate which is mounted on an engine between a filter pad of an engine and an oil filter. The adapter plate is secured to the filter pad by a cylindrical threaded hub which extends through the center of the adapter. One end of the hub screws into the filter pad, and the oil filter screws onto threads formed on the other end of the hub. The adapter plate has an orifice which connects between the inlet side and the outlet side of the oil filter. A differential pressure sensor can be inserted into the orifice in order to measure the pressure differential between the inlet and outlet sides of the oil filter. Based on the pressure differential which is measured by the sensor, it can be determined when the oil filter has become plugged.
The filter pad of a conventional lubrication system is generally equipped with a threaded nipple on which an oil filter can be mounted. In order to retrofit an existing engine with the adapter assembly disclosed in U.S. Patent No. 4,783,256, it is necessary to first remove the nipple of the filter pad and replace it with the threaded hub of the adapter assemblyO The necessity of removing the nipple makes installation of the adapter assembly 29737 ~4~
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on an existing lubrication system somewhat troublesome.
~urthermore, there is little standardization of the pitch of the threads of the hole in the Eilter pad into which the hub of the adapter assembly is screwed, so in order for the adapter assembly to be applicable to a large number of different types of lubrication systems, it is necessary to manufacture many different hu~s having thread pitches corresponding to the various thread pitches of the filter pads. In addition, the above-described adapter plate has no provision for sampling oil from individual oil passages, such as from an oil inlet passage or an oil outlet passage. Therefore, it is impossible to sample oil flowing through the filter during the operation of an engine or to test the differential pressure sensor without removing it from the adapter plate.
Accordingly, the present invention provides an adapter assembly for a fluid system having a spin-on filter unit which has a base with a fluid inlet and a fluid outlet and a filter element disposed in a fluid flow path between the inlet and the outlet and which is attachable to a filter pad having an inlet chamber and an outlet chamber and a nipple on which the filter unit can be mounted, the adapter assembly comprising an adapter plate having a first side, a second side, and an aperture to allow fluid to flow from the inlet chamber of the filter pad to the inlet of the filter unit; a hub detachably mounted on the adapter plate and having a first end and a second end and including means for detachably connecting the first end of the hub to the nipple of -`,' `' ` `
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the filter pad, means Eor detachably connecting the second end o~
the hub to the filter unit, means for retaining the first side of the adapter plate in sealed engagement with the filter pad, means for retaining the base of the filter unit in sealed engagement with the second side of the adapter plate, and a fluid channel to allow fluid to flow from the outlet of the filter unit to the outlet chamber of the filter pad; connecting means for connecting a differential pressure detector to the adapter plate, the connecting means including a detector orifice; a firs~ passage communicating between the aperture in the adapter plate and the detector orifice; and a second passage communicating between the channel in the hub and the detector orifice, the adapter plate having at least one sampling port formed therein which communicates between an outer surface of the adapter plate and an inner portion of the adapter plate through which fluid can flow.
The present invention further provides an adapter assembly for a fluid system having a spin-on filter unit which has a base with a fluid inlet and a fluid outlet and a filter element disposed in a fluid flow path between the inlet and the outlet and which is attachable to a filter pad having an inlet chamber and an outlet chamber and a nipple on which the filter unit can be m~unted, the adapter assembly comprising an adapter plate including a ring-shaped outer portion, a ring-shaped inner portion which is coaxial with the outer portion, at least one spoke which extends between the inner and outer portions, a first side and a second side, a central aperture, and an outer aperture to allow i:
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fluid to flow from the inlet chamber of the filter pad to the inlet of the filter unit; a hub detachably mounted inside the central aperture of the adapter plate and having a first end and a second end and including means for detachably connecting the first end of the hub to the nipple of the filter pad, means for detachably connecting the second end of the hub to the filter unit, means for retaining the first side of the adapter plate in sealed engagement with the filter pad, means for retaining the base of the filter unit in sealed engagement with the second side of the adapter plate, and a fluid channel to allow fluid to flow from the outlet of the filter unit to the outlet chamber of the filter pad; connecting means for connecting a differential pressure detector to the adapter plate, the connecting means including a detector orifice which extends into the adapter plate from a peripheral edge thereof and having an axis extending radially inward toward the center of the adapter plate; a first passage communicating between the aperture in the adapter plate and the detector orifice; a second passage communicating between the channel in the hub and the detector orifice and extending radially through the spoke coaxially with respect to the detector orifice; a first sampling port formed in the adapter plate which communicates between the aperture in the adapter plate and an outer surface of the adapter plate; and a second sampling port formed in the adapter plate which communicates between the channel in the hub and the outer surface of the adapter plate.
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The present invention thus provides a convenient, effective and economical way to allow monitoring of the pressure differential across the filter element of either a new or existing system utilizin~ a spin-on filter mounted on a ~ilter pad. For example, the present invention may provide input for an indicator to be used to warn of clogged filter elements 50 that operation of an engine with the bypass valve open may be avoided yet filters may be used to their full capacity for greatest economy.
Other objects, advantages, and aspects of the present invention will become apparent upon reading the following detailed description and appended claims and upon reference to the accompany drawings.
Figure 1 is a longitudinal cross-sectional view of an exemplary adapter assembly embodying the present invention as shown mounted between a spin-on filter unit and a filter pad.
Figure 2 is a plan view of the adapter plate of the exemplary adapter assembly of Figure 1.
As shown in Figure 1, a filter arrangement 10 according to the present invention has a filter pad 12 which is equipped with a hollow, threaded nipple 13. The nipple 13 has external threads formed on both ends thereof. The external threads 25 on the left end of the nipple 13 in Figure 1 screw into corresponding internal threads formed in the filter pad 12. The filter pad 12 defines separate inlet and outlet chambers 23, 24 which are respectively coupled to inlet and outlet lines or ports (not shown) of a fluid system such as a hydraulic or lubrication oil system. A flat ,~ 'y ~รง
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seating surface 30 is formed on an end surface of the filter pad 12 for the adapter assembly to seat against.
The adapter assembly 100 generally comprises a hollow, threaded hub lol and an adapter plate 102. The hub 101, which may be fashioned from any suitable rigid impervious material compatible with the fluid being filtered, has a generally tubular body 103 defining a central channel 104. A first end 105 of the hub 101 has internal threads which engage the external threads of right end of the nipple 13 in Figure 1. A flange 107 extends radially outwardly from the tubular body 103 at a position near the second end 106 of the hub 101. Flats are preferably formed along the periphery of the flange 107, allowing engagement by a wrench to tighten the hub 101 onto the nipple 13 to an appropriate degree of torque. A fluid passage 108 extends through the tubular body 103 at a position between the first end 105 of the hub 101 and the flange 107.
The adapter plate 102, which also may be fashioned from any suitable rigid impervious material compatible with the fluid being filtered, preferably has a circular form, as shown in Figure 2, generally comprising first and second sides 109, llO and a peripheral edge 111. The adapter plate 102 includes a ring-shaped inner portion 112 held in fixed coaxial relation with a ring-shaped outer portion 113 by several spokes 114. The inner portion 112 defines a central aperture 115 on the inner periphery of which is formed a circumferentially-extending groove 116. The outer portion 113 includes first and second end faces 117 and 118.
29737 _9_ , - 2 ~ 2 9 The first end face 117, which has mounted on it a circular seal 120, such as the groove and 0-ring arrangement illustrated in Figure 1, has a diameter similar to that of the seating surface 30 of the filter pad 12. The spokes 114 define several apertures 121 between the inner and outer portions l:L2, 113 of the adapter plate 102.
A conventional filter unit 11 is mounted on the second end face 118 of the adapter plate 102. The filter unit 11 typically includes a housing 14 which is sealed to the periphery of an attachment plate or base 15 and which contains a hollow, cylindrical filter element 16. The filter element 16 is mounted concentrically on one side of the base 15 while a seal 20 is mounted concentrically on the opposite side of the base 15. The base 15 includes a central outlet hole 21 and several inlet holes 22 positioned between the outlet hole 21 and the seal 20. The base 15 has internal threads formed thereon which engage with the external threads formed on the second end 106 of the hub 101.
To allow detection of the differential pressure across the filter element 16, the adapter plate 102 further includes a fitting 122 to which a differential pressure detector ~not shown) may be mounted. In the exemplary adapter assembly 100, the fitting 122 generally comprises an orifice 123 which is formed in the peripheral edge 111 of the adapter plate 102 and extends radially inwardly through the ring-shaped outer portion 113 into a spoke 114. The detector, which may comprise any suitable conventional device, such as those available from Pall Corporation . . . ~. .,. , , ~ , ,, :
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under the trademarks DELTAMYND or DELTADYNE, may be mounted within the orifice 123, by bolts (not shown), for example, which cooperate with tapped holes 12~ in the outer portion 113.
Alternatively, the detector may be mou:nted by means of a retaining ring or threaded fitting. A first fluid passage 125 communicates between an outer section of the detector orifice 123 and the space 126 between the inner and outer portio:ns 112, 113 of the adapter plate 102, which space 126 includes thle apertures 121. A second fluid passage 127 communicates between the circumferential groove 116 of the central aperture 115 and an inner section of the detector orifice 123. However, the locations at which the first and second passages 125, 127 intersect the detector orifice 1~3 as well as the shape of the detector orifice 123 may vary depending on the particular differential pressure detector being used.
As shown in Figure 2, the adapter plate 102 is further equipped with a first sampling port 130 and a second sampling port 131 which enable independent sampling of oil flowing into the filter unit 11 and oil leaving the filter unit 11. The first sampling port 130 is a countersunk orifice which extends through the outer portion 113 of the adapter plate 102. Its outer end opens onto the peripheral edge 111 and its inner end opens onto one of the apertures 121. The second sampling port 131 is a countersunk orifice which is formed in the outer portion 113 and extends radially through one of the spokes 114. Its outer end opens onto the peripheral edge 111 of the adapter plate 102 while its inner end opens onto the circumferential groove 116. The 29737 ~
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second sampling port 131 communicates with the central channel 10 of the hub 101 via the circumferential groove 116 and ~luid passage 108 of the hub 101. Each sampling port is shaped so as to receive a corresponding pressure sensox or other measurement device. When not in use, the sampling ports can be sealed by suitable, unillustrated plugs.
The sampling ports and the orifice 123 are suitably spaced around the circumference of the adapter plate 102 so as not to interfere with one another. For example, in Figure 2, the first sampling port 130 is disposed 45 on one side of the axis of the detector orifice 123 and the second sampling port 131 is disposed 120 on the opposite side of the axis of the detector orifice 123.
Although Figure 2 illustrates two sampling ports, it is also possible to employ a single sampling port which communicates with either the circumferential groove 116 or with one of the apertures 121.
In a conventional filter arrangement, the filter unit 11 would be mounted directly on the threaded nipple 13. The exemplary adapter assembly 100 can be easily installed on such a conventional filter arrangement in the following manner. First, the spin-on filter unit 11 is removed from the filter pad 12 by unscrewing it from the threaded nipple 13.
Next, the adapter assembly 100 with the differential pressure detector installed in the fitting 122 is mounted on the filter pad 12. For example, the first end 105 of the hub 101 may be passed through the central aperture 115 of the adapter plate 102 until ' : ' , .
.
.
~112~
the flange 107 engages the ring-shaped inner portion 112 of the adap-ter plate 102. In this position, the fluid passac~e 10~ of the hub lO1 communicates between the central channel 104 and the circumferential groova 116 of the central aperture 115 of the adapter plate 102, the circumferential groove 116 providing positive relief from the hub 101 along its axial span. The internal threads of the first end 105 of the hub 101 can then be loosely engaged in with the external threads of the right end of the nipple 13, and the adapter plate 102 can be rotated about the hub lO1 to locate the fitting 122 in any desired position. With the adapter plate 102 held in position, the hub 101 can then be tightened to the nipple 13 by means of the flats on the flange 107. By the action of the flange 107 against the inner ring-shaped portion 112 of the adapter plate 102, the first side 109 of the adapter plate 102 may be drawn to and retained against the filter pad 12 with the seal 120 on the adapter plate 102 sufficiently sealed against the seating surface 30 of the filter pad 12.
In the illustrated embodiment, the adapter plate 102 is shaped such that it can be reversibly mounted on the filter pad 12. Namely, in Figure 1, the first side 109 of the adapter plate 102 contacts the seating surface 30 of the filter pad 12 and the second side 110 contacts the base 15 of the filter unit 11.
However, if a circular seal 120 or the like is provided on the second side 110, the orientation of the adapter plate 102 can be reversed so that the first side 109 confronts the base 15 of the ~, :, , , : :. :: . :
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filter unit 11 and the second side llO contacts the seating surface 30. The ability to reverse the orientation o~ the adapter plate 102 makes it easier to install on a filter pad 12.
Although an adapter assembly according to the present invention may have a one-piece structure, the two-piece arrangement comprising the hub 101 and adapter plate 102 of the first exemplary assembly 100 is particularly advantageous.
Because the circumferential groove 116 of the central aperture 115 enables the fluid passage 108 in the hub 101 to communicate with the second fluid passage 127 in the adapter plate 102 regardless of their relative angular orientation, the adapter plate 102 may be positioned in any desired angular (i.e., universal) orientation about the hub 101 independent of the angular orientation of the hub 101 required to sufficiently tighten the hub 101 to the filter pad 12. This is important when the available space is limited or when the differential pressure detector is visible only at a particular orientation.
Once the exemplary adapter assembly 100 is mounted on the filter pad 12, the spin-on filter unit 11 may be mounted on the second side 110 of the adapter plate 102 by engaging the threads 26 on the base 15 of the filter unit ll with the external threads on the second end 106 of the hub 101. The filter unit 11 is then tightened onto the hub 101 until the seal 20 on the base 15 of the filter unit is sufficiently sealed against the second end face 118 of the ring-shaped outer portion 113 of the adapter plate 102.
Replacement of the filter unit 11 simply requires unscrewing the 2 ~
old filter unit 11 from the hub 101 of the adapter assembly 100 and then screwing a new filter unit 11 onto the hub 101.
In the preferred mode of operation, fluid at a pressure P1 may be forced into the inlet chamber 23 oE the filter pad 12.
From the inlet chamber ~3, fluid flows through the space 126 between the inner and outer ring-shaped portions 112, 113. Seals 130, such as the groove and 0-ring arrangements, between the hub 101 and the adapter plate 102 on both sides of the circumferential groove 116 of the central aperture 115 prevent the fluid from flowing directly into the hub 101 and bypassing the filter element 16. From the space 126, the fluid flows through the inlet holes 22 in the base 15 of the filter unit 11, into the space between the housing 14 and the filter element 16, and radially inwardly through the filter element 16 where any harmful particles are filtered from the fluid and the pressure of the fluid drops from Pl to P2. Filtrate at pressure P2 then flows from the interior of the filter element 11 through the central channel 104 of the hub 101 into the outlet chamber 24 of the filter pad 12.
The differential pressure across the filter element 16 may be detected by the differential pressure detector (not shown) by means of the adapter assembly 100. The upstream high pressure fluid is channeled to the differential pressure detector via the first fluid passage 125, communicating the pressure Pl to the differential pressure detector. The downstream low pressure fluid is channeled to the differential pressure detector via the fluid passage 108 in the hub 101, the circumferential groove 116 of the , . .. . ... .
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central aperture 115, and the second fluid passage 126 in the adapier plate 102, communicating the pressure P2 to the differential pressure detector. Thus, the seals 130 further isolate the fluid communication between the central channel 104 of the hub 101 and the detector orifice 123.
The sampling ports 130 and 131 can be advantageously employed for a variety of purposes. For example, the first sampling port 130 can be used to sample fluid from the upstream side of the filter unit 11 to determine whether the engine or other device on which the filter pad 12 is mounted is discharging solid particles, which are an indication of engine wear. Also, the pressure between the first sampling port 130 on the upstream side of the filter unit 11 and the second sampling port 131 on the downstream side can be measured to determine whether the differential pressure detector which is installed in the detector orifice 123 is functioning properly. If the sampling p~rts were not provided, the differential pressure detector could only be inspected after being removed from the orifice 123. The sampling ports also make it possible to investigate the viscosity, the temperature, or other characteristics of the fluid being filtered on either the upstream or downstream sides of the filter unit 11 during operation of an engine.
The pitch of the internal threads of the filter pad 12 which engage with the external threads 25 of the nipple 13 will vary considerably among fluid systems. However, the adapter plate 102 may be fairly standard for various filter manufacturers.
201 1 ~29 Accordingly, only one type of adapter plate may be necessary to enable the present invention to be employed with a large number of different fluid systems. Furthermore, since it is not necessary to remove the nipple 13 fxom the filter pad 12, the adapter assembly 100 can be installed on an existing fluid system extremely easily.
While an exemplary adapter assemb:Ly embodying the present invention have been shown, it will be understood, of course, that the present invention is not limited to those embodiments.
Modification may be made by those skil:Led in the art, particularly in light of the foregoing teaching. It is, thereforQ, contemplated by the appended claims to cover any such modification which incorporates the essential features of this invention or encompasses the true spirit and scope of the present invention.
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Claims (6)
1. An adapter assembly for a fluid system having a spin-on filter unit which has a base with a fluid inlet and a fluid outlet and a filter element disposed in a fluid flow path between the inlet and the outlet and which is attachable to a filter pad having an inlet chamber and an outlet chamber and a nipple on which the filter unit can be mounted, the adapter assembly comprising;
an adapter plate having a first side, a second side, and an aperture to allow fluid to flow from the inlet chamber of the filter pad to the inlet of the filter unit;
a hub detachably mounted on the adapter plate and having a first end and a second end and including means for detachably connecting the first end of the hub to the nipple of the filter pad, means for detachably connecting the second end of the hub to the filter unit, means for retaining the first side of the adapter plate in sealed engagement with the filter pad, means for retaining the base of the filter unit in sealed engagement with the second side of the adapter plate, and a fluid channel to allow fluid to flow from the outlet of the filter unit to the outlet chamber of the filter pad;
connecting means for connecting a differential pressure detector to the adapter plate, the connecting means including a detector orifice;
a first passage communicating between the aperture in the adapter plate and the detector orifice; and a second passage communicating between the channel in the hub and the detector orifice, the adapter plate having at least one sampling port formed therein which communicates between an outer surface of the adapter plate and an inner portion of the adapter plate through which fluid can flow.
an adapter plate having a first side, a second side, and an aperture to allow fluid to flow from the inlet chamber of the filter pad to the inlet of the filter unit;
a hub detachably mounted on the adapter plate and having a first end and a second end and including means for detachably connecting the first end of the hub to the nipple of the filter pad, means for detachably connecting the second end of the hub to the filter unit, means for retaining the first side of the adapter plate in sealed engagement with the filter pad, means for retaining the base of the filter unit in sealed engagement with the second side of the adapter plate, and a fluid channel to allow fluid to flow from the outlet of the filter unit to the outlet chamber of the filter pad;
connecting means for connecting a differential pressure detector to the adapter plate, the connecting means including a detector orifice;
a first passage communicating between the aperture in the adapter plate and the detector orifice; and a second passage communicating between the channel in the hub and the detector orifice, the adapter plate having at least one sampling port formed therein which communicates between an outer surface of the adapter plate and an inner portion of the adapter plate through which fluid can flow.
2. An adapter assembly as claimed in claim 1 wherein:
the adapter plate comprises a ring-shaped outer portion, a ring-shaped inner portion which is coaxial with the outer portion, and at least one spoke which extends between the inner and outer portions, the aperture being disposed between the inner and outer portions; and the sampling port extends through the outer portion between an outer peripheral surface and an inner peripheral surface of the outer portion which adjoins the aperture.
the adapter plate comprises a ring-shaped outer portion, a ring-shaped inner portion which is coaxial with the outer portion, and at least one spoke which extends between the inner and outer portions, the aperture being disposed between the inner and outer portions; and the sampling port extends through the outer portion between an outer peripheral surface and an inner peripheral surface of the outer portion which adjoins the aperture.
3. An adapter assembly as claimed in claim 1 wherein:
the adapter plate comprises a ring-shaped outer portion, a ring-shaped inner portion which is coaxial with the outer portion, and at least one spoke which extends between the inner and outer portions, the aperture being disposed between the inner and outer portions; and the sampling port extends through the spoke between an outer peripheral surface of the ring-shaped outer portion and an inner peripheral surface of the inner portion.
the adapter plate comprises a ring-shaped outer portion, a ring-shaped inner portion which is coaxial with the outer portion, and at least one spoke which extends between the inner and outer portions, the aperture being disposed between the inner and outer portions; and the sampling port extends through the spoke between an outer peripheral surface of the ring-shaped outer portion and an inner peripheral surface of the inner portion.
4. An adapter assembly as claimed in claim 3 wherein:
the ring-shaped inner portion has a circumferentially-extending groove formed in an inner peripheral surface thereof;
the hub has a fluid passage formed therein which extends between the fluid channel and a portion of an outer surface of the hub which communicates with the groove;
the second passage extends between the groove and the detector orifice; and the sampling port extends between the groove and an outer peripheral surface of the ring-shaped outer portion.
the ring-shaped inner portion has a circumferentially-extending groove formed in an inner peripheral surface thereof;
the hub has a fluid passage formed therein which extends between the fluid channel and a portion of an outer surface of the hub which communicates with the groove;
the second passage extends between the groove and the detector orifice; and the sampling port extends between the groove and an outer peripheral surface of the ring-shaped outer portion.
5. An adapter assembly as claimed in claim 1 wherein the first and second sides of the adapter plate are similarly formed so that either may sealingly engage the filter pad, sealingly engage the base of the filter unit, and cooperate with the retaining means so that the adapter plate is reversible.
6. An adapter assembly for a fluid system having a spin-on filter unit which has a base with a fluid inlet and a fluid outlet and a filter element disposed in a fluid flow path between the inlet and the outlet and which is attachable to a filter pad having an inlet chamber and an outlet chamber and a nipple on which the filter unit can be mounted, the adapter assembly comprising:
an adapter plate including a ring-shaped outer portion, a ring-shaped inner portion which is coaxial with the outer portion, at least one spoke which extends between the inner and outer portions, a first side and a second side, a central aperture, and an outer aperture to allow fluid to flow from the inlet chamber of the filter pad to the inlet of the filter unit;
a hub detachably mounted inside the central aperture of the adapter plate and having a first end and a second end and including means for detachably connecting the first end of the hub to the nipple of the filter pad, means for detachably connecting the second end of the hub to the filter unit, means for retaining the first side of the adapter plate in sealed engagement with the filter pad, means for retaining the base of the filter unit in sealed engagement with the second side of the adapter plate, and a fluid channel to allow fluid to flow from the outlet of the filter unit to the outlet chamber of the filter pad;
connecting means for connecting a differential pressure detector to the adapter plate, the connecting means including a detector orifice which extends into the adapter plate from a peripheral edge thereof and having an axis extending radially inward toward the center of the adapter plate;
a first passage communicating between the aperture in the adapter plate and the detector orifice;
a second passage communicating between the channel in the hub and the detector orifice and extending radially through the spoke coaxially with respect to the detector orifice;
a first sampling port formed in the adapter plate which communicates between the aperture in the adapter plate and an outer surface of the adapter plate: and a second sampling port formed in the adapter plate which communicates between the channel in the hub and the outer surface of the adapter plate.
an adapter plate including a ring-shaped outer portion, a ring-shaped inner portion which is coaxial with the outer portion, at least one spoke which extends between the inner and outer portions, a first side and a second side, a central aperture, and an outer aperture to allow fluid to flow from the inlet chamber of the filter pad to the inlet of the filter unit;
a hub detachably mounted inside the central aperture of the adapter plate and having a first end and a second end and including means for detachably connecting the first end of the hub to the nipple of the filter pad, means for detachably connecting the second end of the hub to the filter unit, means for retaining the first side of the adapter plate in sealed engagement with the filter pad, means for retaining the base of the filter unit in sealed engagement with the second side of the adapter plate, and a fluid channel to allow fluid to flow from the outlet of the filter unit to the outlet chamber of the filter pad;
connecting means for connecting a differential pressure detector to the adapter plate, the connecting means including a detector orifice which extends into the adapter plate from a peripheral edge thereof and having an axis extending radially inward toward the center of the adapter plate;
a first passage communicating between the aperture in the adapter plate and the detector orifice;
a second passage communicating between the channel in the hub and the detector orifice and extending radially through the spoke coaxially with respect to the detector orifice;
a first sampling port formed in the adapter plate which communicates between the aperture in the adapter plate and an outer surface of the adapter plate: and a second sampling port formed in the adapter plate which communicates between the channel in the hub and the outer surface of the adapter plate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB898904556A GB8904556D0 (en) | 1989-02-28 | 1989-02-28 | Adapter assembly for a filter arrangement |
| GB8904556.1 | 1989-02-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2011129A1 true CA2011129A1 (en) | 1990-08-31 |
Family
ID=10652458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2011129 Abandoned CA2011129A1 (en) | 1989-02-28 | 1990-02-28 | Adapter assembly for a filter arrangement |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2011129A1 (en) |
| GB (1) | GB8904556D0 (en) |
-
1989
- 1989-02-28 GB GB898904556A patent/GB8904556D0/en active Pending
-
1990
- 1990-02-28 CA CA 2011129 patent/CA2011129A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| GB8904556D0 (en) | 1989-04-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |