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WO2008062189A2 - Improvements in fluid pumping systems - Google Patents

Improvements in fluid pumping systems Download PDF

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Publication number
WO2008062189A2
WO2008062189A2 PCT/GB2007/004456 GB2007004456W WO2008062189A2 WO 2008062189 A2 WO2008062189 A2 WO 2008062189A2 GB 2007004456 W GB2007004456 W GB 2007004456W WO 2008062189 A2 WO2008062189 A2 WO 2008062189A2
Authority
WO
WIPO (PCT)
Prior art keywords
pump
manifold
pump assembly
fluid
impeller
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.)
Ceased
Application number
PCT/GB2007/004456
Other languages
French (fr)
Other versions
WO2008062189A3 (en
Inventor
Alan Rodney Henderson
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.)
Salamander Pumped Shower Systems Ltd
Original Assignee
Salamander Pumped Shower Systems Ltd
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 Salamander Pumped Shower Systems Ltd filed Critical Salamander Pumped Shower Systems Ltd
Publication of WO2008062189A2 publication Critical patent/WO2008062189A2/en
Publication of WO2008062189A3 publication Critical patent/WO2008062189A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/60—Pump mixers, i.e. mixing within a pump
    • B01F25/64—Pump mixers, i.e. mixing within a pump of the centrifugal-pump type, i.e. turbo-mixers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/60—Pump mixers, i.e. mixing within a pump
    • B01F25/64—Pump mixers, i.e. mixing within a pump of the centrifugal-pump type, i.e. turbo-mixers
    • B01F25/641—Multi-staged turbo-mixers
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B5/00—Use of pumping plants or installations; Layouts thereof
    • E03B5/02—Use of pumping plants or installations; Layouts thereof arranged in buildings
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • 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
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F04B13/02—Pumps specially modified to deliver fixed or variable measured quantities of two or more fluids at the same time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/12—Combinations of two or more pumps
    • F04D13/14—Combinations of two or more pumps the pumps being all of centrifugal type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4273—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps suction eyes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/105—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system pumps combined with multiple way valves

Definitions

  • This invention relates to fluid pumping systems and in particular, though not exclusively, to systems for the supply of water for domestic use.
  • the present invention provides a pump assembly comprising a first pumping device having a manifold with an impeller drivable therein to pump fluid from a first supply source to an outlet of the manifold, the manifold further comprising an inlet for receiving fluid from a second supply source for combining with the fluid from the first supply source, the action of the impeller serving to enhance mixing together of the fluids in the manifold.
  • Figure 1 is a schematic illustration of a pump assembly according to the invention.
  • the pump assembly seen in Figure 1 comprises two pumps 10 and 11, one of which is connected to a cold water supply and the other of which is connected to a hot water supply via respective inlets 12 and 13. It is not important which way round the hot and cold supplies are connected. It will be seen that pump 11 has an outlet 15 which is connected to the manifold 16 of pump 10. Pump 11 thus acts as a feed to pump 10 and pump 10 acts to combine and mix together the two water supplies, as will be described.
  • the mixer pump 10 is of an impeller-driven type, such as the centrifugal pump shown in Figure 1, ie it has a rotary impeller 14.
  • Other kinds of impeller-driven pump could be used instead, for example a regenerative (turbine) pump, albeit with a somewhat differently configured feeder stream to that seen in Figure 1.
  • the feeder pump 11 is also of the impeller-driven variety. It would be possible, however, for the feeder pump to be of a different variety, or even for the feed water to the mixer pump not to be supplied by a pump at all, but from a header tank or from the mains, for example.
  • the impeller 14 contributes to the mixing process in that it helps to break up what might otherwise be discrete laminar streams of unmixed hot and cold water. Control of the mixing process is enhanced if the two flows are arranged to be at substantially equal pressure when they are combined.
  • outlet 15 from the feeder pump 11 is arranged here to enter the manifold 16 of the mixer pump 10 tangentially with respect to the impeller 14. It will also be seen that the outlet 12 from the feeder pump 11 here is arranged to be in line with the outlet 18 from the mixer pump 10 (which is also arranged tangentially with respect to the impeller 14). These configurations are not essential, although they have been found to produce a satisfactory mixing process. Also, the arrangement is convenient in terms of design, because it enables the manifolds of both pumps to be produced as part of a single unit, indicated in Figure 1 by the dotted outline 17.
  • the outlet 18 from the manifold 16 of the mixer pump 10 is of a larger bore than the outlet 15 from the feeder pump 11. This is to allow for the greater flow which results from the combination of the flows from the two sources.
  • a sensor 19 situated in the outlet 18 of the mixer pump 10 measures the temperature of the mixed water downstream of the manifold 16.
  • the sensor 19 is connected to a control device 20, which can be set to adjust the temperature of the mixed water. Adjustment of the water temperature is achieved by varying the speeds of one or other or both of the two pumps 10 and 11 (shown diagrammatically by control lines 21 and 22). If a pump is not used for the supply feed to the mixer pump 10, then some other means of adjusting this feed may be used.
  • the pump assembly could be used to provide a controlled supply of water to an underfioor heating system.
  • the pump assembly would be arranged to mix a supply of hot water from a boiler with cooler water extracted conveniently from the return flow from the heating system.
  • the supply of hot water from the boiler could be controlled by a modulating valve, ie an infinitely variable valve, such as a motorised valve, a proportional solenoid valve or a thermostatically controlled valve.
  • the modulating valve would be controlled by the control device 20 to regulate the flow of hot water to the mixer pump 10.
  • the control device 20 would at the same time control the speed of the mixer pump 10, in response to the temperature detected downstream by sensor 19 in outlet 18, whereby to regulate the temperature of the mixed water that is supplied to the heating system. It will be appreciated that the systems described may be used to mix other fluids apart from hot and cold water and be used in applications other than for domestic use.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Structural Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)

Abstract

A pump assembly comprises a first pump (10) having a manifold (16) with an impeller (14) for pumping fluid from a first source (12), eg a cold water supply, to an outlet (18) of the manifold. Fluid from a second source (13), eg a hot water supply, is fed by a second pump (11) to the manifold (16) of the first pump via outlet (15). The two fluids mix together in the manifold (16) of the first pump (10), the mixing being enhanced by the action of the impeller (14). A control device (20) adjusts the speeds of the two pumps to vary the fluid mixture in response to signals from a downstream sensor (19).

Description

Improvements in fluid pumping systems
This invention relates to fluid pumping systems and in particular, though not exclusively, to systems for the supply of water for domestic use.
In domestic water supply systems, for example for supplying water to appliances such as showers or underfloor heating systems, there is a need to be able to control the water temperature. There are various ways of achieving this, typically comprising mixing together separately pumped hot and cold water streams. Such conventional arrangements can tend not to provide very accurate control and/or can suffer from loss of pressure and/or flow rate.
The present invention provides a pump assembly comprising a first pumping device having a manifold with an impeller drivable therein to pump fluid from a first supply source to an outlet of the manifold, the manifold further comprising an inlet for receiving fluid from a second supply source for combining with the fluid from the first supply source, the action of the impeller serving to enhance mixing together of the fluids in the manifold.
By way of example, embodiments of the present invention will now be described with reference to the accompanying drawing, in which:
Figure 1 is a schematic illustration of a pump assembly according to the invention.
The pump assembly seen in Figure 1 comprises two pumps 10 and 11, one of which is connected to a cold water supply and the other of which is connected to a hot water supply via respective inlets 12 and 13. It is not important which way round the hot and cold supplies are connected. It will be seen that pump 11 has an outlet 15 which is connected to the manifold 16 of pump 10. Pump 11 thus acts as a feed to pump 10 and pump 10 acts to combine and mix together the two water supplies, as will be described.
The mixer pump 10 is of an impeller-driven type, such as the centrifugal pump shown in Figure 1, ie it has a rotary impeller 14. Other kinds of impeller-driven pump could be used instead, for example a regenerative (turbine) pump, albeit with a somewhat differently configured feeder stream to that seen in Figure 1.
In this embodiment, the feeder pump 11 is also of the impeller-driven variety. It would be possible, however, for the feeder pump to be of a different variety, or even for the feed water to the mixer pump not to be supplied by a pump at all, but from a header tank or from the mains, for example.
By arranging to combine the flows of hot and cold water in the manifold 16 of the mixer pump 11, it has been found that a relatively thorough mixing of the hot and cold water streams can be achieved. It is understood that the impeller 14 contributes to the mixing process in that it helps to break up what might otherwise be discrete laminar streams of unmixed hot and cold water. Control of the mixing process is enhanced if the two flows are arranged to be at substantially equal pressure when they are combined.
It will be seen that the outlet 15 from the feeder pump 11 is arranged here to enter the manifold 16 of the mixer pump 10 tangentially with respect to the impeller 14. It will also be seen that the outlet 12 from the feeder pump 11 here is arranged to be in line with the outlet 18 from the mixer pump 10 (which is also arranged tangentially with respect to the impeller 14). These configurations are not essential, although they have been found to produce a satisfactory mixing process. Also, the arrangement is convenient in terms of design, because it enables the manifolds of both pumps to be produced as part of a single unit, indicated in Figure 1 by the dotted outline 17.
The outlet 18 from the manifold 16 of the mixer pump 10 is of a larger bore than the outlet 15 from the feeder pump 11. This is to allow for the greater flow which results from the combination of the flows from the two sources.
A sensor 19 situated in the outlet 18 of the mixer pump 10 measures the temperature of the mixed water downstream of the manifold 16. The sensor 19 is connected to a control device 20, which can be set to adjust the temperature of the mixed water. Adjustment of the water temperature is achieved by varying the speeds of one or other or both of the two pumps 10 and 11 (shown diagrammatically by control lines 21 and 22). If a pump is not used for the supply feed to the mixer pump 10, then some other means of adjusting this feed may be used.
It has been found with the arrangement shown that mixing of the hot and cold water occurs effectively in the manifold 16 of the mixer pump 10. The sensor 18 can therefore be positioned only a relatively short distance downstream of the manifold 16 and yet still give a relatively accurate indication of the temperature of the mixed water. In conventional systems, where mixing of the water is not so effective, temperature sensing at such an early stage is not so accurate, because the flow tends to consist more of discrete streams of hot and cold water.
Mixing in conventional systems can of course be improved by using baffles or other such means to help break up the flow. However, this tends to have the disadvantage of reducing the pressure of the resulting stream, and possibly also its flow rate. By using a special mixing pump and combining the flows in the manner described above, the system shown in Figure 1 can achieve a satisfactory mixing of the two water supplies within a relatively short distance. It can also provide an effective means of controlling the temperature of the mixed flow without significantly disrupting either its pressure or its flow rate. The system is particularly effective if two pumps are used, as shown.
In an alternative embodiment, the pump assembly could be used to provide a controlled supply of water to an underfioor heating system. The pump assembly would be arranged to mix a supply of hot water from a boiler with cooler water extracted conveniently from the return flow from the heating system. In this case, there may be a need for only one pump in the assembly, namely the mixer pump 10. The supply of hot water from the boiler could be controlled by a modulating valve, ie an infinitely variable valve, such as a motorised valve, a proportional solenoid valve or a thermostatically controlled valve. The modulating valve would be controlled by the control device 20 to regulate the flow of hot water to the mixer pump 10. The control device 20 would at the same time control the speed of the mixer pump 10, in response to the temperature detected downstream by sensor 19 in outlet 18, whereby to regulate the temperature of the mixed water that is supplied to the heating system. It will be appreciated that the systems described may be used to mix other fluids apart from hot and cold water and be used in applications other than for domestic use.

Claims

1. A pump assembly comprising a first pumping device having a manifold with an impeller drivable therein to pump fluid from a first supply source to an outlet of the manifold, the manifold further comprising an inlet for receiving fluid from a second supply source for combining with the fluid from the first supply source, the action of the impeller serving to enhance mixing together of the fluids in the manifold.
2. A pump assembly as claimed in claim 1 wherein the inlet for feeding fluid from the second supply source into the manifold is arranged generally tangentially with respect to the impeller.
3. A pump assembly as claimed in claim 1 or claim 2 wherein the outlet from the manifold is arranged generally tangentially with respect to the impeller.
4. A pump assembly as claimed in claim 3 wherein said inlet and said outlet are arranged generally in alignment with each other.
5. A pump assembly as claimed in any preceding claim wherein said outlet from the manifold has a larger bore than said inlet into the manifold.
6. A pump assembly as claimed in any preceding claim wherein fluid from the second supply source is delivered to said inlet by means of a second pump.
7. A pump assembly as claimed in claim 6 wherein said first and second pumps are arranged side by side with their respective manifolds being formed as part of a single unit.
8. A pump assembly as claimed in claim 7 wherein said second pump is an impeller-driven pump.
9. A pump assembly as claimed in any preceding claim and further comprising means for adjusting the presume and/or flow rate of the fluid from at least one of the first and second supply sources whereby to vary the resulting fluid mixture.
10. A pump assembly as claimed in claim 9 wherein said adjusting means comprises means for controlling the speed of the or one of the or both pumps.
11. A pump assembly as claimed in any preceding claim and further comprising a sensor in the outlet from the manifold of the first pump for detecting the temperature of the mixed fluid.
12. A pump assembly as claimed in claim 11 and further comprising means for controlling the fluid mixture in response to signals from the sensor.
13. A pump assembly substantially as herein described with reference to the accompanying drawings.
14. A fluid supply system comprising a pump assembly as claimed in any preceding claim.
PCT/GB2007/004456 2006-11-21 2007-11-21 Improvements in fluid pumping systems Ceased WO2008062189A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0623213A GB2447860B (en) 2006-11-21 2006-11-21 Improvements in fluid pumping systems
GB0623213.6 2006-11-21

Publications (2)

Publication Number Publication Date
WO2008062189A2 true WO2008062189A2 (en) 2008-05-29
WO2008062189A3 WO2008062189A3 (en) 2008-08-21

Family

ID=37636257

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/004456 Ceased WO2008062189A2 (en) 2006-11-21 2007-11-21 Improvements in fluid pumping systems

Country Status (2)

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GB (1) GB2447860B (en)
WO (1) WO2008062189A2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101984295A (en) * 2010-09-01 2011-03-09 魏强 Make-up water pressurization system using circulation and make-up water difunctional integrated pump
US20140271123A1 (en) * 2013-03-13 2014-09-18 Ghsp, Inc. Two pump design with coplanar interface surface
CN104791878A (en) * 2015-03-31 2015-07-22 仪征祥源动力供应有限公司 Constant-pressure water supplement system controlled by electromagnetic valve
JPWO2013129179A1 (en) * 2012-02-28 2015-07-30 三菱レイヨン株式会社 Enzyme storage method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2507029B (en) * 2012-07-11 2019-04-17 Quantex Patents Ltd Pump fittings and methods for their manufacture
CN103933891A (en) * 2014-04-30 2014-07-23 江苏新美星包装机械股份有限公司 High-speed mixing delivery system
WO2021123155A2 (en) * 2019-12-19 2021-06-24 Rift Ip Limited An improved pump

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US3450051A (en) * 1967-03-22 1969-06-17 American Optical Corp Rotary pump
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101984295A (en) * 2010-09-01 2011-03-09 魏强 Make-up water pressurization system using circulation and make-up water difunctional integrated pump
JPWO2013129179A1 (en) * 2012-02-28 2015-07-30 三菱レイヨン株式会社 Enzyme storage method
US20140271123A1 (en) * 2013-03-13 2014-09-18 Ghsp, Inc. Two pump design with coplanar interface surface
US9752590B2 (en) * 2013-03-13 2017-09-05 Ghsp, Inc. Two pump design with coplanar interface surface
CN104791878A (en) * 2015-03-31 2015-07-22 仪征祥源动力供应有限公司 Constant-pressure water supplement system controlled by electromagnetic valve

Also Published As

Publication number Publication date
GB2447860A (en) 2008-10-01
GB2447860B (en) 2011-08-03
GB0623213D0 (en) 2007-01-03
WO2008062189A3 (en) 2008-08-21

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