IL128289A - Compression or expansion device - Google Patents

Compression or expansion device

Info

Publication number
IL128289A
IL128289A IL12828999A IL12828999A IL128289A IL 128289 A IL128289 A IL 128289A IL 12828999 A IL12828999 A IL 12828999A IL 12828999 A IL12828999 A IL 12828999A IL 128289 A IL128289 A IL 128289A
Authority
IL
Israel
Prior art keywords
pair
hose
compressive fluid
ports
contact elements
Prior art date
Application number
IL12828999A
Other versions
IL128289A0 (en
Original Assignee
Peristal Tec Temed 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 Peristal Tec Temed Ltd filed Critical Peristal Tec Temed Ltd
Priority to IL12828999A priority Critical patent/IL128289A/en
Publication of IL128289A0 publication Critical patent/IL128289A0/en
Priority to JP2000596274A priority patent/JP2002535561A/en
Priority to PCT/IL2000/000050 priority patent/WO2000045053A1/en
Priority to DE60004476T priority patent/DE60004476D1/en
Priority to AU23163/00A priority patent/AU2316300A/en
Priority to AT00901870T priority patent/ATE247228T1/en
Priority to EP00901870A priority patent/EP1147312B1/en
Publication of IL128289A publication Critical patent/IL128289A/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B45/00Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
    • F04B45/08Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having peristaltic action
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/004Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being air

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Reciprocating Pumps (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Glass Compositions (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Compressor (AREA)

Abstract

A compressor or expansion device (1) for use with compressive fluid and comprising a flexible hose (8) connected between a pair of ports (5A, 5B) and against which a pair of spaced apart, adjacent contact elements bear whereby a portion of the hose is substantially occluded at both ends entrapping a quantity of compressive fluid therewithin. The pair of spaced apart, adjacent contact elements are displaced along the hose from an inlet port (5A) of the pair of ports to an outlet port (5B) thereof so as to provide a flow of compressive fluid therebetween. The hose tapers between the pair of ports such that the quantity of compressive fluid is respectively entrapped in a first volume V1 proximal the inlet port and a second volume V2 proximal the outlet port whereby a ratio of pressures P1/P2 at the pair of ports is proportional to a ratio of the volumes V2/V1 in accordance with general equation (I), where k is the adiabatic power for the compressive fluid.

Description

Compression or expansion device Peristal Tec Temed Ltd. t»Ji pv-iWUi C.115250.3 FIELD AND BACKGROUND OF THE INVENTION The invention is in the field of compressors and expansion devices in general and particularly for use in heat exchange systems for refrigeration, air conditioning and other purposes.
SUMMARY OF THE INVENTION In accordance with the present invention, there is provided a compressor or expansion device for use with compressive fluid and comprising a flexible hose connected between a pair of ports and against which a pair of spaced apart, adjacent contact elements bear whereby a portion of said hose is substantially occluded at both ends thereby entrapping a quantity of compressive fluid merewithin; said pair of contact elements being displaceable along said hose from an inlet port of said pair of ports to an outlet port thereof so as to provide a flow of compressive fluid therebetween; said hose substantially tapering between said pair of ports such that said quantity of compressive fluid is respectively entrapped in a first volume Vi proximal said inlet port and a second volume V2 proximal said outlet port whereby a ratio of pressures P1/P2 at said pair of ports is proportional to a ratio of said volumes V2 V 1 in accordance with the general equation: where k is the adiabatic power for the compressive fluid.
The compressor or expansion device of the present invention essentially makes use of the construction and operation of a peristaltic pump, for example, as described and illustrated in US Patent 4,540,350. However, in the device of the present invention, a hose tapers such that a pair of spaced apart, adjacent contact elements travelling therealong entraps a quantity of compressive fluid within a first volume Vi proximal an inlet port and a second volume V2 proximal an outlet port. As a consequence of such a change in volume, there is a proportional change in the pressures Pi and P2 of the same entrapped quantity of compressive fluid respectively at the inlet and outlet ports in accordance with the general equation: where the adiabatic power k «1.4_ for air. Thus, for compression purposes, a hose tapers from its inlet port to its outlet port i.e. it is converging in the direction of flow of compressive fluid whilst for expansion purposes, a hose tapers from its outlet port to its inlet port i.e. it is diverging in the direction of flow of compressive fluid.
The device of the present invention is preferably constructed to provide a high coefficient of performance. To this end, the device is preferably constructed as a sealed housing containing a rotatable carousel of rollers constituting contact elements and a pair of flexible hoses tapering in opposite senses and through which circulates a flow of lubricating liquid. In this arrangement, one of the flexible hoses tapers in the same sense as the direction of rotation of the carousel whilst the other tapers in the opposite sense whereby the expansion of the flow of compressive fluid through the latter hose partly offsets the work required for the compression of the flow of compressive fluid in the former hose.
In addition, a hose preferably has a normally flat construction adapted to be expanded to a substantially elliptical cross section in a transverse direction to its length so as to minimize energy losses due to its repeated deformation. A further advantage provided for by this construction resides in that a hose's walls subtend an angle of less than 90° therebetween when expanded which lends to a longer hose life due to reduced material stresses.
BRIEF DESCRIPTION OF THE DRAWINGS For a better understanding of the invention and to show how the same may be carried out in practice, by way of a non-limiting example, reference will now be made to the accompanying drawings, in which: Fig. 1 is an exploded view of a combined compressor cum expansion device of the present invention; Fig. 2 is a transverse cross section view of a hose of the device of Figure 1; Fig. 3 is a longitudinal cross section view of the device of Figure 1 along line ΠΙ-ΙΙΙ; Fig. 4 is a schematic view of a refrigeration heat exchange system including the combined compressor cum expansion device of Figure 1; and Figs. 5A-5C are transverse cross section views of an entrapped compression hose portion of the system of Figure 4 respectively along lines A-A, B-B and C-C in Figure 3, DETAILED DESCRIPTION OF DRAWINGS With reference now to Figures 1-3, there is provided a right cylindrical housing 1 having an interior surface 1A and a longitudinal axis 2. The housing 1 is sealed by front and rear cover plates 3 and 4, thereby defining a housing interior IB whose pressure is under the control of a pump (not shown).
The housing 1 is provided with two pairs of ports 5A and 5B and 6A and 6B between which are respectively connected flexible hoses 8 and 9 laid end-to-end so as to substantially circumscribe a full circle. The hose 8 tapers from port 5A to port 5B whilst the hose 9 tapers from the port 6B to the port 6A i.e. they taper in opposite senses.
The housing 1 is provided with a further pair of ports 7A and 7B via which a flow of lubricating liquid is circulated therethrough.
The hoses 8 and 9 have a normally flat construction and are adapted to be expanded to a substantially elliptical cross section (see Figure 2). As shown, the hoses 8 and 9 have a three-ply construction including an outer anti-friction hard rubber sleeve 10 to diminish friction loss and to prevent leakage of compressive fluid, an intermediate fabric sleeve 11 to provide strength and an inner soft rubber sleeve 12 to prevent leakage of compressive fluid from a hose portion delimited by a pair of adjacent rollers as described below.
A carousel 13 of equiangularly spaced five rollers 14A, 14B, 14C, 14D and 14E is driven about the longitudinal axis 2 by a motor (not shown) in a direction of rotation A. Each roller 14 is freely rotatable about an axis of rotation parallel to the longitudinal axis 2 and is adapted to bear against the hoses 8 and 9 so as to deform same against the housing's interior surface 1A whereby pair of rollers (14A, 14B), (14C,14D) and (14D,14E) respectively define therebetween hose portions 8 A, 9 A and 9B.
As described above, by virtue of its tapering in the same sense as the direction of rotation A, the ports 5A and 5B respectively constitute inlet and outlet ports for the hose 8 which acts as a compressor whilst by virtue of its tapering in an opposite sense to the direction of rotation A, the ports 6A and 6B respectively constitute inlet and outlet ports for the hose 9 which acts as an expansion device.
The operation of the peristaltic device is now described with reference to Figure 4 which schematically shows the housing 1 constituting part of a refrigeration heat exchange system 15 which includes a hot high pressure heat exchanger 16 connected between the ports 5B and 6A and a cold low pressure heat exchanger 17 connected between the ports 6B and 5 A. For operation of the system 15, the pressure in the housing interior IB is reduced so as to be less than the pressure of the mcorning flow of refrigerant through inlet port 5A and the carousel 13 is rotated in the direction of rotation A.
As the carousel 13 rotates, the volume of the hose portion 8 A entrapped by the rollers 14A and 14B monotonically decreases from a maximum volume Vi proximal the inlet port 5A i.e. at line A-A to a minimum volume V2 proximal the outlet port 5B i.e. at line C-C so the pressure P2 at the outlet port 5B increases relative to the pressure Pi at the inlet port 5A. For example, for k » 1.4 for air, the device can achieve a compression from Pi = 3 bar to P2 = 6.16 bar due to a decrease in volume from Vi=0.0001 m3 to V2=0.00006 m3. Against this, in a similar and opposite manner, the pressure at the outlet port 6B is less than that at the inlet port 6A.
While the invention has been described with respect to a limited number of embodiments, it will be appreciated that many variations, modifications and other applications of the invention may be made. For example, a compressor or expansion device of the present invention can be employed in air conditioning systems, commercial production of solar energy, and the like. In addition, a device installed in a sealed housing may be operated in an open cycle mode when the prevailing pressure within the housing is less than about 0.8 Atm in which case the device no longer requires a cold low pressure heat exchanger instead of which the ambient air acts as a refrigerant.

Claims (7)

128289/2 CLAIMS:
1. A compressor or expansion device (1) for use with compressive fluid and comprising a pair of flexible hoses (8, 9) each hose being connected between its associated pair of ports (5A, 5B or 6A, 6B) and having a pair of spaced apart, adjacent contact elements (14) bearing thereagainst, whereby a portion of said hose is substantially occluded at both ends entrapping a quantity of compressive fluid therewithin; said pair of spaced apart, adjacent contact elements being displaceable along said hose from the inlet port (5A or 6A) of said pair of ports to the outlet port (5B or 6B) associated with a corresponding hose so as to provide a flow of compressive fluid therebetween; said hoses substantially tapering in opposite directions between their associated ports such that said quantity of compressive fluid is respectively entrapped in a first volume Vi proximal said inlet port and a second volume V2 proximal said outlet port whereby a ratio of pressures Ρί/Ρ2 at said pair of ports is proportional to a ratio of said volumes V2/V i in accordance with the general equation: 1 _ v, where k is the adiabatic power for the compressive fluid.
2. The device according to Claim 1 wherein said pair of hoses are laid end to end so as to substantially circumscribe a full circle.
3. The device according to Claim 2 further comprising a carousel of 128289/2 7 contact elements (13) rotatable in a given direction and including the two pairs of spaced apart adjacent contact elements for bearing against said hoses.
4. The device according to any one of Claims 1 to 3 wherein the device is installed in a sealed housing having a prevailing pressure therewithin less than pressure of the incoming flow of the refrigerant.
5. The device according to any one of Claims 1 to 4 wherein said hose has a three-ply construction including an outer anti-friction hard rubber sleeve (10), an intermediate fabric sleeve (11) and an inner soft rubber sleeve (12).
6. The device according to Claim 5 wherein said hose has an essentially oval cross-sectional shape and said inner sleeve (12) formed with sharp corners at the ends of the long axis of the oval.
7. The device according to Claim 5 wherein said hose has an essentially oval cross-sectional shape and said outer sleeve has ends truncated perpendicularly to the long axis at the oval. For the Applicants, REINHOLD COHN AND PARTNERS
IL12828999A 1999-01-29 1999-01-29 Compression or expansion device IL128289A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
IL12828999A IL128289A (en) 1999-01-29 1999-01-29 Compression or expansion device
JP2000596274A JP2002535561A (en) 1999-01-29 2000-01-27 Compression and expansion device
PCT/IL2000/000050 WO2000045053A1 (en) 1999-01-29 2000-01-27 Compression or expansion device
DE60004476T DE60004476D1 (en) 1999-01-29 2000-01-27 COMPRESSION OR EXPANSION DEVICE
AU23163/00A AU2316300A (en) 1999-01-29 2000-01-27 Compression or expansion device
AT00901870T ATE247228T1 (en) 1999-01-29 2000-01-27 COMPRESSION OR EXPANSION DEVICE
EP00901870A EP1147312B1 (en) 1999-01-29 2000-01-27 Compression or expansion device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IL12828999A IL128289A (en) 1999-01-29 1999-01-29 Compression or expansion device

Publications (2)

Publication Number Publication Date
IL128289A0 IL128289A0 (en) 1999-11-30
IL128289A true IL128289A (en) 2001-08-08

Family

ID=11072434

Family Applications (1)

Application Number Title Priority Date Filing Date
IL12828999A IL128289A (en) 1999-01-29 1999-01-29 Compression or expansion device

Country Status (7)

Country Link
EP (1) EP1147312B1 (en)
JP (1) JP2002535561A (en)
AT (1) ATE247228T1 (en)
AU (1) AU2316300A (en)
DE (1) DE60004476D1 (en)
IL (1) IL128289A (en)
WO (1) WO2000045053A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7712319B2 (en) 2004-12-27 2010-05-11 Carrier Corporation Refrigerant charge adequacy gauge
US7472557B2 (en) 2004-12-27 2009-01-06 Carrier Corporation Automatic refrigerant charging apparatus
US7419192B2 (en) 2005-07-13 2008-09-02 Carrier Corporation Braze-free connector utilizing a sealant coated ferrule
US9568226B2 (en) 2006-12-20 2017-02-14 Carrier Corporation Refrigerant charge indication
FR2972030B1 (en) * 2011-02-25 2014-10-31 Sncf STIRLING ENGINE
DE202012102972U1 (en) * 2011-09-21 2013-01-08 Gunter Kauß refrigeration machine
US9759465B2 (en) 2011-12-27 2017-09-12 Carrier Corporation Air conditioner self-charging and charge monitoring system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL21604C (en) * 1900-01-01
US3886763A (en) * 1974-02-26 1975-06-03 Rovac Corp Self-driven refrigerator
US4175400A (en) * 1977-02-18 1979-11-27 The Rovac Corporation Air conditioning system employing non-condensing gas with accumulator for pressurization and storage of gas
DE3320091A1 (en) 1983-06-03 1984-12-06 Streicher, Irmgard, 7141 Beilstein HOSE PUMP
DE8605680U1 (en) * 1986-03-01 1986-07-03 Erdmann, Karl, 6900 Heidelberg pump
DE3703124A1 (en) * 1987-02-03 1988-08-11 Manfred Streicher HOSE PUMP
DE3837167A1 (en) * 1988-11-02 1989-06-22 Erdmann Karl Building heating and cooling system
AUPN695895A0 (en) * 1995-12-04 1996-01-04 J. Bertony Pty. Limited Continuous flow linear pump

Also Published As

Publication number Publication date
AU2316300A (en) 2000-08-18
DE60004476D1 (en) 2003-09-18
JP2002535561A (en) 2002-10-22
ATE247228T1 (en) 2003-08-15
EP1147312B1 (en) 2003-08-13
IL128289A0 (en) 1999-11-30
WO2000045053A1 (en) 2000-08-03
EP1147312A1 (en) 2001-10-24

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Legal Events

Date Code Title Description
FF Patent granted
KB Patent renewed
MM9K Patent not in force due to non-payment of renewal fees