EP2300715A1 - A compressor with improved refrigerant flow performance - Google Patents
A compressor with improved refrigerant flow performanceInfo
- Publication number
- EP2300715A1 EP2300715A1 EP09737976A EP09737976A EP2300715A1 EP 2300715 A1 EP2300715 A1 EP 2300715A1 EP 09737976 A EP09737976 A EP 09737976A EP 09737976 A EP09737976 A EP 09737976A EP 2300715 A1 EP2300715 A1 EP 2300715A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- piston
- refrigerant
- compressor
- protrusion
- 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
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
-
- 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/18—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the effective cross-section of the working surface of the piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
Definitions
- the present invention relates to a compressor wherein the flow performance of the refrigerant left in the cylinder during the pumping of the refrigerant is improved.
- a piston is provided for suction of the refrigerant and a cylinder wherein the piston is disposed.
- a valve table is provided on the cylinder whereon the suction and discharge holes are arranged.
- the piston receives the refrigerant from the suction hole by reciprocating inside the cylinder and afterwards reciprocates for compressing and pumping the refrigerant through the discharge hole out of the cylinder.
- One of the criteria for efficient operation of the compressor is the rate of the refrigerant, received into the cylinder in one cycle, discharged out of the cylinder.
- the dead space is zero. As the amount of the dead space increases, the compressor efficiency decreases. The reason for this is that, despite consuming energy for discharging the entire refrigerant inside the cylinder by compressing the piston in the entire cylinder volume, the refrigerant equaling to the dead space cannot be discharged out of the cylinder.
- a boss arranged on one face of the piston that is seated in the delivery orifice occupies the greater part of the dead space during the compression of the refrigerant.
- the boss and the delivery orifice can be configured of matching cylindrical or frustoconical shapes. Since the cross section through which the refrigerant passes gets narrower as the boss is seated in the delivery orifice and since the boss closes the entire delivery orifice, as a result of formed turbulences, the discharge of the refrigerant gets difficult and losses increase. Some part of the gain by decreasing the dead space is lost by making the flow difficult.
- projections are provided on the piston that decrease the dead space without obstructing passage of the refrigerant until the piston reaches the top dead center and enter into the discharge port when the piston reaches the top dead center.
- the aim of the present invention is the realization of a compressor wherein the flow of the refrigerant through the cylinder to the discharge hole is improved.
- the compressor realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises at least one groove on the lateral surfaces of the protrusion arranged on the piston, extending from the piston surface towards the top end of the protrusion.
- the protrusion is partially seated in the discharge hole.
- the grooves formed on the protrusion the sudden narrowing of the flow path cross section is prevented and the refrigerant flow from the discharge hole is convenient, with a controllable discharge and without creating much dead space.
- the sudden increase of the refrigerant acceleration and the temperature and respectively the decrease in yield by the reducing of pressure is prevented.
- the groove guides the refrigerant towards the discharge hole and shapes the flow of the refrigerant.
- the groove is formed on the portion of the protrusion near the cylinder axis. Accordingly, refrigerant flow can be improved in the region wherein the refrigerant flow is intense.
- the sides of the groove extend parallel to each other.
- the groove sides can either be parallel to the protrusion axis or can be inclined with a certain angle therebetween.
- the groove has a cross section that gets narrower from the piston surface towards the top of the protrusion. Accordingly, the speed of flow that slows when the piston reaches the top dead center is accelerated.
- the groove has a depth that increases from the piston surface towards the top of the protrusion.
- the dead space is minimized by improving the refrigerant flow. This results in the increase of the compressor efficiency.
- Figure 1 - is the schematic view of a compressor.
- Figure 2 - is the perspective view of the protrusion in an embodiment of the present invention.
- Figure 3 - is the perspective view of the protrusion in another embodiment of the present invention.
- Figure 4 - is the perspective view of the protrusion in an alternative embodiment of the present invention.
- Figure 5 - is the perspective view of the protrusion in another alternative embodiment of the present invention.
- Figure 6 - is the perspective view of the protrusion in yet another alternative embodiment of the present invention.
- Figure 7 - is the perspective view of the protrusion in yet another alternative embodiment of the present invention.
- Figure 8 - is the cross sectional view when the protrusion is inside the hole.
- the circulation of the refrigerant fluid that is utilized for cooling is maintained by a hermetic compressor (1) having a piston.
- the compressor (1) comprises a cylinder (2) wherein the refrigerant is received, a cylinder head (3) disposed on the cylinder (2), a valve table (4) whereon the cylinder head (3) is emplaced, a discharge hole (5) on the valve table (4) wherefrom the refrigerant received into the cylinder (2) is discharged, a piston (6) disposed inside the cylinder (2) that activates the refrigerant by reciprocating inside the cylinder (2) ( Figure 1).
- the compressor (1) comprises a protrusion (7) arranged on the piston (6) that is seated in the discharge hole (5) when the piston (6) reaches the top dead center, and at least one groove (8) on the lateral surface of the protrusion (7).
- the groove (8) extends from the surface of the piston (6) towards the top of the protrusion (7).
- the grooves (8) formed on the protrusion (7) prevent the sudden decrease in the cross section wherein the flow takes place as the protrusion (7) enters into the discharge hole (5) and maintains the discharge of the refrigerant from the discharge hole (5) controllably ( Figure 8). Accordingly, the temperature rise of the refrigerant with sudden increase in acceleration and the decrease of pressure are prevented.
- the piston (6) reaches the top dead center, the discharge of the refrigerant from the discharge hole (5) continues by means of the grooves (8) and the dead space in the cylinder (2) is minimized.
- the flow of the refrigerant is controlled by means of the grooves (8) formed on the protrusion (7).
- the protrusion (7) is cylinder shaped.
- the protrusion (7) is configured frustoconically (Figure 2 to Figure 7).
- the protrusion (7) comprises a groove (8) formed on the region thereof near the cylinder (2) axis ( Figure 6 and Figure 7).
- both sides of the groove (8) extend parallel to each other ( Figure 3 and Figure 4).
- the sides of the groove (8) are inclined such that they remain parallel to each other ( Figure 5).
- the groove (8) has a cross section that gets narrower from the surface of the piston (6) towards the top of the protrusion (7) ( Figure 2).
- the groove (8) has a depth that increases from the surface of the piston (6) towards the top of the protrusion (7) ( Figure3).
- the protrusion (7) and the groove (8) are produced in one piece.
- the protrusion (7) is mounted on the piston (6) to be fully overlapping with the surface of the piston (6).
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI200931272T SI2300715T1 (en) | 2008-05-01 | 2009-04-07 | A compressor with improved refrigerant flow performance |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TR200803042 | 2008-05-01 | ||
PCT/EP2009/054140 WO2009132932A1 (en) | 2008-05-01 | 2009-04-07 | A compressor with improved refrigerant flow performance |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2300715A1 true EP2300715A1 (en) | 2011-03-30 |
EP2300715B1 EP2300715B1 (en) | 2015-07-01 |
Family
ID=40849290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09737976.2A Active EP2300715B1 (en) | 2008-05-01 | 2009-04-07 | A compressor with improved refrigerant flow performance |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2300715B1 (en) |
ES (1) | ES2547407T3 (en) |
SI (1) | SI2300715T1 (en) |
WO (1) | WO2009132932A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017034983A1 (en) * | 2015-08-26 | 2017-03-02 | Carrier Corporation | Reciprocating compressor vented piston |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3136477A (en) | 1961-03-28 | 1964-06-09 | Worthington Corp | Multi-stage compressor |
FR2617242A1 (en) | 1987-06-26 | 1988-12-30 | Unite Hermetique Sa | Compressor with improved yield |
US5816783A (en) | 1993-05-19 | 1998-10-06 | Hitachi, Ltd. | Electrically driven hermetic compressor |
DE50003277D1 (en) | 1999-05-25 | 2003-09-18 | Danfoss Compressors Gmbh | Axial piston REFRIGERANT COMPRESSOR |
US6540492B2 (en) * | 2001-04-09 | 2003-04-01 | Carrier Corporation | Compressor piston with reduced discharge clearance |
ES2351695T3 (en) | 2003-07-31 | 2011-02-09 | Arçelik Anonim Sirketi | COMPRESSOR. |
US6997148B1 (en) | 2004-10-15 | 2006-02-14 | Caterpillar Inc. | Engine valve actuator |
-
2009
- 2009-04-07 ES ES09737976.2T patent/ES2547407T3/en active Active
- 2009-04-07 EP EP09737976.2A patent/EP2300715B1/en active Active
- 2009-04-07 WO PCT/EP2009/054140 patent/WO2009132932A1/en active Application Filing
- 2009-04-07 SI SI200931272T patent/SI2300715T1/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2009132932A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017034983A1 (en) * | 2015-08-26 | 2017-03-02 | Carrier Corporation | Reciprocating compressor vented piston |
Also Published As
Publication number | Publication date |
---|---|
SI2300715T1 (en) | 2015-10-30 |
WO2009132932A1 (en) | 2009-11-05 |
ES2547407T3 (en) | 2015-10-06 |
EP2300715B1 (en) | 2015-07-01 |
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