EP1180214A1 - Axial piston refrigerant compressor - Google Patents
Axial piston refrigerant compressorInfo
- Publication number
- EP1180214A1 EP1180214A1 EP00929315A EP00929315A EP1180214A1 EP 1180214 A1 EP1180214 A1 EP 1180214A1 EP 00929315 A EP00929315 A EP 00929315A EP 00929315 A EP00929315 A EP 00929315A EP 1180214 A1 EP1180214 A1 EP 1180214A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- outlet opening
- projection
- sectional area
- cross
- 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.)
- Granted
Links
- 239000003507 refrigerant Substances 0.000 title claims abstract description 19
- 230000007423 decrease Effects 0.000 claims description 15
- 230000007704 transition Effects 0.000 claims description 14
- 238000013459 approach Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
Classifications
-
- 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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
Definitions
- the invention relates to an axial piston refrigerant compressor with at least one piston-cylinder unit, the cylinder of which is closed by a valve plate which has at least one pressure valve with an outlet opening, a projection of the piston protruding into the outlet opening when the piston is nearby its top dead center.
- an axial piston compressor is known with a recess in that part of the piston face which extends from the outlet opening of the pressure valve to the center of the piston face.
- a piston projection can be provided in the recess, which cooperates with the outlet opening.
- the piston projection should fill the outlet opening at top dead center as completely as possible in order to avoid its "harmful space", ie also to expel the gas contained therein and thereby increase the efficiency of the compressor.
- the actual (free) cross-sectional area of the outlet opening is reduced when the piston approaches its upper point, so that the flow resistance in the outlet opening increases.
- the flow conditions in the outlet opening and around the valve closure element can cause the compressed gas to form recirculation zones in part of the outlet opening.
- the piston projection can increase the problem in that the distance between the projection and the outlet opening has already decreased to a flow restriction before the projection has reached the outlet opening.
- the free cross-sectional area of the outlet opening can thus be considerably narrowed before the pressure valve opens.
- the invention has for its object to provide an axial piston refrigerant compressor of the type mentioned, which has an even higher efficiency.
- this object is achieved in that the outlet opening, the piston projection, the inside of the valve plate and the end face of the piston limit a flow channel with a continuous course of its axial cut edges over at least most of its circumference that the free cross-sectional area of the flow channel is so long through the smallest Cross-sectional area of the outlet opening is determined until the piston has reached a position during its pressure stroke which is below the top dead center by at least the height of the outlet opening, that during the further pressure stroke of the piston the relative decrease in the free cross-sectional area of the flow channel is less than the relative decrease of the volume of the pressure chamber and that at least 45% of the volume of the outlet opening in top dead center of the piston are filled by the projection.
- the cross-sectional area of the outlet opening decreases towards the outside of the valve plate, that the cross-sectional area of the projection decreases towards its free end and that the cross-sectional areas of the outlet opening and of the projection change in the axial direction in such a way that the free cross-sectional area changes of the flow channel changes relatively less during piston movement than the volume remaining in the cylinder. It is thereby achieved that the flow resistance of the flow channel remains at a low value, while the flow or mass flow decreases during the pressure stroke of the piston.
- the flow resistance of the flow channel can be determined by the smallest cross-sectional area of the outlet opening until the free end of the piston projection is aligned with the inside of the valve plate. This ensures an optimal gas outflow while the mass flow through the outlet opening is greatest.
- the flow resistance of the flow channel through the smallest cross-sectional area of the outlet opening must be determined until 50% of the height of the piston projection has penetrated into the outlet opening. This achieves an optimal gas outlet until the piston speed is significantly reduced and the gas flow has decreased.
- An advantageous embodiment consists in that an axial section through the outlet opening of the valve plate and the piston projection has curved cutting edges.
- the cutting edge of the outlet opening can be steeper than that of the projection.
- the compressor according to the invention can be designed such that the transitions between the valve plate surface and the outlet opening and the transition between the piston end face and the projection are continuous, the transition between the outlet opening and valve seat and the transition between the projection and the piston end face being rounded .
- the gas discharge during the emptying of the cylinder can take place with almost no eddy formation, the flow resistance being reduced.
- the outlet opening can be asymmetrical. This is advantageous if the outlet opening is offset from the center of the cylinder.
- the outlet opening can be made symmetrical. This is advantageous if the outlet opening is close to the center of the cylinder.
- the piston projection can also be designed asymmetrically. As a result, the projection can be adapted to an asymmetrical outlet opening. If the piston projection is symmetrical, it can be adapted to a symmetrical outlet opening.
- FIG. 2 shows an axial section corresponding to FIG. 1 of a further known axial piston refrigerant compressor with an end projection of the piston
- Fig. 3 is an axial section corresponding to Fig. 1 of a piston-cylinder unit of a first
- FIG. 4 shows an axial section through a piston-cylinder unit of an embodiment of a refrigerant compressor according to the invention, somewhat modified compared to the embodiment according to FIG. 3, 5 likewise shows an axial section, corresponding to the previous figures, of part of a piston-cylinder unit of a third exemplary embodiment of a refrigerant compressor according to the invention,
- FIG. 6 likewise shows an axial section, corresponding to the previous figures, of part of a piston-cylinder unit of a fourth exemplary embodiment of a refrigerant compressor according to the invention.
- 7 shows an axial section corresponding to FIG. 4 of a piston-cylinder unit to illustrate the determination of the free cross-sectional area of the flow channel.
- FIG. 8 shows an axial section corresponding to FIG. 3 of a piston-cylinder unit with two different piston positions.
- a piston 1 is guided in a cylinder, not shown, which is closed by a valve plate 2.
- the valve plate 2 is provided with a schematically represented pressure valve 3, which has a circular cylindrical outlet opening 4 in the valve plate 2 with a valve seat 5 formed on the outside of the valve plate 2 and a valve closure element 6 in the form of a plate.
- the valve closure element 6 is lifted under the internal pressure of the cylinder against the force of a spring, not shown, from the valve seat 5 to open the pressure valve 3, or is designed as a leaf spring clamped on one side on the valve plate 2.
- the volume of the outlet opening 4 acts as a "harmful space", which further reduces the efficiency of the compressor.
- the known refrigerant compressor according to FIG. 2 differs from that according to FIG. 1 only in that the end face 8 of the piston 1 is provided with an approximately frustoconical projection 9 which partially fills the outlet opening 4.
- the projection 9 can already restrict the flow before the projection 9 enters the outlet opening 4 and before the pressure valve 3 is opened.
- the pressure valve 3 is opened, the flow velocity of the gas as it is pushed out of the cylinder by the piston 1 is greatest, so that a reduction in the cross-sectional area of the flow channel considerably reduces the efficiency of the compressor.
- the end face 8 of the piston 1 is provided with a projection 10, which partially fills the outlet opening 11 of the pressure valve 3 at the top dead center of the piston 1, as indicated by the continuous boundary line of the piston 1 is shown.
- the dashed lines represent the piston 10 in various lower positions.
- the cross-sectional area or the diameter of the outlet opening 11 changes over its entire height H, i.e. the cross-sectional area or its diameter decreases continuously and non-linearly from the inside to the outside.
- the transition from the inside 7 of the valve plate 2 to the outlet opening 11 is also rounded.
- the projection 10 of the piston 1 also has a cross-sectional area that decreases continuously over its entire height and non-linearly towards its free end. The same also applies to the cross-sectional diameter of the projection 10. However, the rate of decrease in the cross-sectional area of the projection 10 is somewhat greater than that of the outlet opening 11. At the same time, the transition between the flat end face 8 of the piston 10 and the peripheral surface of the projection 10 is continuous or rounded .
- a flow channel 12 is formed between the projection 10 and the outlet opening 11, the axial section edges of which are continuously curved in each axial section plane and the free cross-sectional area of which depends on the position of the piston 1, i.e. decreases during its pressure stroke.
- the cross-sectional area of the flow channel 12 does not change abruptly, but continuously over the length of the flow channel.
- the piston 1 While the piston 1 is moving from the lower position shown in broken lines in FIG. 3 to the top dead center, ie during its pressure stroke, it reaches the middle position shown in dashed lines. In this position the cross-sectional area of the flow channel is reduced. However, as the piston 1 approaches top dead center, its speed and thus also the mass or volume flow of the expelled gas decrease. Therefore, the cross-sectional area of the flow passage 12 can be reduced without increasing the pressure loss. At the top dead center of the piston 1, represented by the solid line, the cross-sectional area of the flow channel 12 is reduced to a minimum, but at the same time the gas flow (mass or volume flow) has decreased.
- the efficiency of the compressor is increased by reducing the pressure loss during the evacuation of the cylinder and at the same time reducing the "harmful space".
- FIG. 4 differs from that of FIG. 3 only in that the transition 13 between the valve seat 5 and the outlet opening 11 and the transition 14 between the end face of the projection 10 and its peripheral surface are continuously rounded.
- the continuous transitions 13, 14 and the continuous transitions between the inside 7 of the valve plate 2 and the outlet opening 11 and between the end face 8 of the piston 1 and the circumferential surface of the projection 10 cause less eddies to occur in the gas flow, so that the recirculation zones and the flow noise can be reduced.
- the outlet opening 15 of the pressure valve 3 is asymmetrical.
- the projection 16 of the piston 1 is also correspondingly asymmetrical. That is, the slopes of the flanks of the outlet opening 15 and the protrusion 16 are different on opposite or opposite sides, left and right in the axial sectional view.
- this exemplary embodiment corresponds to the exemplary embodiment according to FIG. 4.
- the outlet opening 18 and the projection 19 are also asymmetrical, so that their axial section contours largely correspond to each other, and both are even closer than in the embodiment of FIG. 5 on the wall of the cylinder 17.
- the gas flows during the pressure stroke when the pressure valve 3 is open, mainly from the left, approximately central region of the end face 8 in FIG. 6 to the outlet opening 18, the surfaces facing each other near the inside of the cylinder 17 can -li ⁇
- outlet opening 18 and the projection 19 are provided with edges 20 and 21 which merge into partially cylindrical surfaces 22 and 23, respectively.
- the arrangement of the outlet opening 18 in the immediate vicinity of the inside of the cylinder 17 enables both the outlet opening 18 and the suction opening (not shown) to be formed in the valve plate 2 with a larger diameter.
- the projection 10, 16, 19 can fill at least approximately 45% of the volume of the outlet opening 11, 15, 18.
- FIG. 7 illustrates the determination of the free cross-sectional area of the flow channel for a given position of the piston 1 using the example of the rotationally symmetrical shape of the outlet opening 11 and piston projection 12 shown in FIG. 4.
- the free cross-sectional area generally contains that for the outflowing gas standing and the smallest geometric cross-sectional area determined by the "" clear width "" of the flow channel.
- the free cross-sectional area can be determined mathematically for different courses of the axial cut edges of the outlet opening 11 and the piston projection 12.
- a series of points 24 are defined on the axial cut edges of the outlet opening 11 over the entire height of the valve plate 2.
- a plurality of points 25 are defined on the axial cut edges of the projection 12.
- d eff 2 - ⁇ ja - d
- d eff can be thought of as the diameter of a circular opening that has the same cross-sectional area as the annular gap between the inside of the outlet opening and the piston projection.
- the point 24 on the axial cut edge of the outlet opening 11 is now connected in a corresponding manner to all points 25 of the projection, and values for d eff are determined. The smallest value found corresponds to the effective diameter of the flow channel for this point 24 in question.
- the free cross-sectional area A of the flow channel 12 for a given piston position is determined from the overall smallest value d effmm of the effective one
- A d e 2 ffmm - - results.
- the respective volume V of the pressure chamber comprises the free volume in the cylinder and the volume of the dead space up to the upper end surface of the valve plate 2.
- Pressure space decreases relatively faster than the free cross-sectional area A of the passage 12, whereby an increase in flow resistance and flow noise are avoided.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19923611 | 1999-05-25 | ||
DE19923611 | 1999-05-25 | ||
PCT/DK2000/000271 WO2000071896A1 (en) | 1999-05-25 | 2000-05-22 | Axial piston refrigerant compressor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1180214A1 true EP1180214A1 (en) | 2002-02-20 |
EP1180214B1 EP1180214B1 (en) | 2003-08-13 |
Family
ID=7908914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00929315A Expired - Lifetime EP1180214B1 (en) | 1999-05-25 | 2000-05-22 | Axial piston refrigerant compressor |
Country Status (5)
Country | Link |
---|---|
US (1) | US6623258B1 (en) |
EP (1) | EP1180214B1 (en) |
AU (1) | AU4744300A (en) |
DE (1) | DE50003277D1 (en) |
WO (1) | WO2000071896A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AUPQ489799A0 (en) * | 1999-12-24 | 2000-02-03 | Orbital Engine Company (Australia) Proprietary Limited | Improved fluid compressor |
KR100922213B1 (en) * | 2003-06-13 | 2009-10-20 | 엘지전자 주식회사 | Hermatic compressor |
ATE484678T1 (en) * | 2003-07-31 | 2010-10-15 | Arcelik As | COMPRESSOR |
US7654283B2 (en) * | 2003-10-21 | 2010-02-02 | Seiko Epson Corporation | Check valve and pump including check valve |
KR100774485B1 (en) * | 2005-08-26 | 2007-11-08 | 엘지전자 주식회사 | Compressor |
ES2547407T3 (en) | 2008-05-01 | 2015-10-06 | Arçelik Anonim Sirketi | Compressor with improved cooling flow performance |
DE102008036999B4 (en) * | 2008-08-07 | 2012-03-29 | Danfoss Household Compressors Gmbh | Refrigerant compressor, piston of a refrigerant compressor and piston assembly |
JP5533061B2 (en) * | 2009-06-12 | 2014-06-25 | パナソニック株式会社 | Hermetic compressor and refrigeration system |
KR101660537B1 (en) * | 2010-06-14 | 2016-09-27 | 한온시스템 주식회사 | Compressor |
KR101261136B1 (en) | 2010-12-16 | 2013-05-06 | 한라비스테온공조 주식회사 | compressor |
JP5828136B2 (en) * | 2011-08-08 | 2015-12-02 | パナソニックIpマネジメント株式会社 | Hermetic compressor |
GB2499336A (en) * | 2013-04-19 | 2013-08-14 | Vilis Ivars Lietuvietis | Interior heat exchanger for reciprocating gas compressor |
JP6876463B2 (en) * | 2017-02-24 | 2021-05-26 | 株式会社前川製作所 | Compressor piston, compressor and heat pump unit |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE527635C (en) | 1929-03-11 | 1931-06-20 | John Frederick Nevinson Craig | Cooling device for piston engines, especially air compressors |
US2190537A (en) * | 1937-05-03 | 1940-02-13 | Wiebicke Paul | Diesel motor |
DE1257578B (en) | 1961-03-17 | 1967-12-28 | Halbergerhuette G M B H | Liquid piston pump |
DE3032009A1 (en) * | 1980-08-25 | 1982-03-04 | Dienes Werke für Maschinenteile GmbH & Co KG, 5063 Overath | PISTON COMPRESSOR FOR SMALL REFRIGERATORS |
GB2165317B (en) * | 1984-07-27 | 1987-12-02 | Enfo Grundlagen Forschungs Ag | Improvements in or relating to piston compressors |
US5203857A (en) * | 1990-06-01 | 1993-04-20 | Bristol Compressors, Inc. | Gas compressor head and discharge valve construction |
US5149254A (en) | 1991-06-06 | 1992-09-22 | White Consolidated Industries, Inc. | Refrigeration compressor having a contoured piston |
US5816783A (en) * | 1993-05-19 | 1998-10-06 | Hitachi, Ltd. | Electrically driven hermetic compressor |
DE69316212T2 (en) * | 1993-09-28 | 1998-07-16 | Isuzu Ceramics Res Inst | Thermal insulation machine |
DE19515217C2 (en) * | 1995-04-28 | 1999-03-11 | Danfoss Compressors Gmbh | Refrigerant compressors |
-
2000
- 2000-05-22 WO PCT/DK2000/000271 patent/WO2000071896A1/en active IP Right Grant
- 2000-05-22 DE DE50003277T patent/DE50003277D1/en not_active Expired - Lifetime
- 2000-05-22 EP EP00929315A patent/EP1180214B1/en not_active Expired - Lifetime
- 2000-05-22 AU AU47443/00A patent/AU4744300A/en not_active Abandoned
- 2000-05-22 US US10/009,667 patent/US6623258B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0071896A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2000071896A1 (en) | 2000-11-30 |
DE50003277D1 (en) | 2003-09-18 |
AU4744300A (en) | 2000-12-12 |
US6623258B1 (en) | 2003-09-23 |
EP1180214B1 (en) | 2003-08-13 |
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