EP4103839A1 - A flow guide for a reciprocating-type compressor of a cooling system and a reciprocating-type compressor for a cooling system comprising said flow guide - Google Patents
A flow guide for a reciprocating-type compressor of a cooling system and a reciprocating-type compressor for a cooling system comprising said flow guideInfo
- Publication number
- EP4103839A1 EP4103839A1 EP21705171.3A EP21705171A EP4103839A1 EP 4103839 A1 EP4103839 A1 EP 4103839A1 EP 21705171 A EP21705171 A EP 21705171A EP 4103839 A1 EP4103839 A1 EP 4103839A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder head
- chamber
- flow guide
- suction
- cylinder
- 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.)
- Withdrawn
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
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/123—Fluid connections
-
- 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
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/125—Cylinder heads
Definitions
- the present disclosure relates to a flow guide for a reciprocating-type compressor of a cooling system, the compressor comprising a pressure chamber, a suction chamber formed by a valve plate and a cylinder head, a cylinder chamber placed on a side of the valve plate opposite the cylinder head.
- the present disclosure also relates to a reciprocating-type compressor for a cooling system, the compressor comprising a pressure chamber, a suction chamber formed by a valve plate and a cylinder head, a cylinder chamber placed on a side of the valve plate opposite the cylinder head.
- the present disclosure further relates to use of a flow guide in a reciprocating- type compressor for optimizing performance of the compressor.
- the present disclosure finally relates to a method of optimizing a reciprocating-type compressor of a cooling system, the compressor comprising a pressure chamber, a suction chamber formed by a valve plate and a cylinder head, a cylinder chamber placed on a side of the valve plate opposite the cylinder head.
- compressors of a reciprocating-type used in cooling systems have a simple inflow arrangement, where intake refrigerant from an evaporator is led through an inlet opening of the compressor into a suction chamber and further through a suction opening in a valve plate into a cylinder chamber for compression of the refrigerant. The compressed refrigerant it then led back into the cooling circuit to the evaporator via a condenser.
- an economizer is placed in the cooling circuit between the condenser and the evaporator.
- the reciprocating compressor can be of a single stage type or a multiple stage type.
- US 2015/0361972 A1 discloses a refrigerant compressor system, comprising at least one low-pressure stage and at least one high-pressure stage, a suction duct leading from a suction connection for the refrigerant to the low-pressure stage, an intermediate-pressure duct leading from the low- pressure stage to the high-pressure stage, a high-pressure connection connected to the high-pressure stage, and a lubricant bath to which the intermediate pressure in the intermediate pressure duct is applied.
- the low-pressure stage and the high-pressure stage comprises a first cylinder bank to form the low-pressure stage and a second cylinder bank to form the high- pressure stage, thus allowing both the low-pressure stage and the high- pressure stage to be separated in a simple manner by the fact that they are formed by different cylinder banks of a compressor.
- Such compressors normally discloses a suction chamber formed as a hollow cylinder head showing a relatively large empty space or volume within the cylinder head as illustrated in Figure 1.
- a problem with the solutions of the prior art is that when operating the compressor, the refrigerant passing through the suction chamber and through one or more suction openings in the valve plate will swirl around in the suction chamber when entering a cylinder chamber through the one or more suction openings in the valve plate.
- suction openings in the valve plate are holes forming sharp edges, causing more flow resistance to the refrigerant when entering the cylinder chamber.
- a flow guide for a reciprocating- type compressor of a cooling system comprising a pressure chamber, a suction chamber formed by a valve plate and a cylinder head, a cylinder chamber placed on a side of the valve plate opposite the cylinder head, wherein the flow guide is formed directly in the cylinder head by drilling, milling or molding of the cylinder head, providing the cylinder head with one or more channels, guiding intake refrigerant from an inlet opening of the cylinder head to one or more suction openings leading from the suction chamber into the cylinder chamber.
- the reciprocating compressor in the cooling system can be of a single stage type or a multiple stage type.
- a first stage compresses refrigerant from an evaporator in the cooling system to a first compression level and a second stage compresses the refrigerant to a second compression level, the first and second stages being fluidly connected by piping or channels in a housing of the compressor, which piping or channels are separated from pressure chamber and cylinder chamber of the first and second stage by valves.
- a flow guide for a reciprocating- type compressor of a cooling system comprising a pressure chamber, a suction chamber formed by a valve plate and a cylinder head, a cylinder chamber placed on a side of the valve plate opposite the cylinder head, wherein the flow guide is formed in the cylinder head by an insert, which insert is provided with one or more channels, the insert guiding intake refrigerant from an inlet opening of the cylinder head to one or more suction openings leading from the suction chamber into the cylinder chamber.
- the flow guide easily can be changed without need to change the whole cylinder head. Also giving an opportunity to adapt the flow guide to different flow characteristics, for example for different refrigerants or mixtures of refrigerants.
- each channel is formed internally in the insert.
- each channel is formed as a groove on an outer side of the insert.
- each channel at an end abutting the inlet opening has an opening diameter corresponding to a diameter of the inlet opening.
- each channel at an end abutting a suction opening has an opening diameter corresponding to a diameter of the suction opening.
- a smooth flow through the suction opening is achieved.
- the number of channels is joined in a mutual inlet end and in the opposite end of the channels, abutting the one or more suction openings in the valve plate.
- the flow guide at least partly comprises a material having a thermal conductivity being lower than a thermal conductivity of a material of which a cylinder and/or a cylinder head is made of.
- the flow guide at least partly comprises a ceramic material and/or a plastic material and/or a composite material including carbon fibers.
- a reciprocating-type compressor for a cooling system comprising a pressure chamber, a suction chamber formed by a valve plate and a cylinder head, a cylinder chamber placed on a side of the valve plate opposite the cylinder head, wherein a flow guide is formed directly in the cylinder head by drilling, milling or molding of the cylinder head, providing the cylinder head with one or more channels, guiding intake refrigerant from an inlet opening of the cylinder head to one or more suction openings leading from the suction chamber into the cylinder chamber.
- a reciprocating-type compressor for a cooling system comprising a pressure chamber, a suction chamber formed by a valve plate and a cylinder head, a cylinder chamber placed on a side of the valve plate opposite the cylinder head, wherein a flow guide is formed in the cylinder head by an insert, which insert is provided with one or more channels, the insert guiding intake refrigerant from an inlet opening of the cylinder head to one or more suction openings leading from the suction chamber into the cylinder chamber.
- the compressor can be improved in that the flow guide easily can be changed without need to change the whole cylinder head. Also giving an opportunity to adapt the flow guide to different flow characteristics, for example for different refrigerants or mixtures of refrigerants.
- each channel is formed internally in the insert.
- each channel is formed as a groove on an outer side of the insert.
- each channel at an end abutting the inlet opening has an opening diameter corresponding to a diameter of the inlet opening.
- a smooth flow through the inlet opening is achieved.
- each channel at an end abutting a suction opening has an opening diameter corresponding to a diameter of the suction opening.
- the number of channels is joined in a mutual inlet end and in the opposite end of the channels, abutting the one or more suction openings in the valve plate.
- the flow guide at least partly comprises a material having a thermal conductivity being lower than a thermal conductivity of a material of which a cylinder and/or a cylinder head is made of.
- the flow guide at least partly comprises a ceramic material and/or a plastic material and/or a composite material including carbon fibers.
- a flow guide according to any of the embodiments of the first and second aspects in a reciprocating-type compressor for optimizing performance of the compressor.
- a method of optimizing a reciprocating-type compressor of a cooling system comprising a pressure chamber, a suction chamber formed by a valve plate and a cylinder head, a cylinder chamber placed on a side of the valve plate opposite the cylinder head, wherein the method comprises forming a flow guide in the cylinder head by drilling, milling or molding of the cylinder head, providing the cylinder head with one or more channels, guiding intake refrigerant from an inlet opening of the cylinder head to one or more suction openings leading from the suction chamber into the cylinder chamber.
- a method of optimizing a reciprocating-type compressor of a cooling system comprising a pressure chamber, a suction chamber formed by a valve plate and a cylinder head, a cylinder chamber placed on a side of the valve plate opposite the cylinder head, wherein the method comprises placing a flow guide, formed by an insert, in the suction chamber, which insert is provided with one or more channels, guiding intake refrigerant from an inlet opening of the cylinder head to one or more suction openings leading from the suction chamber into the cylinder chamber.
- the method comprises replacing the cylinder head with a cylinder head the method comprises one or more channels, guiding intake refrigerant from an inlet opening of the cylinder head to one or more suction openings leading from the suction chamber into the cylinder chamber.
- Figure 1 shows an example of a known cylinder head on top of a pair of cylinders (prior art);
- Figure 2 shows a 1st stage cylinder head, according to an embodiment of the present disclosure with a part of the cylinder head cut away, showing a suction channel
- Figure 3 shows an embodiment of a 1 st stage cylinder head, with another part of the cylinder head cut away, showing a different view of the suction channels;
- Figure 4 shows a cross section of an embodiment of a 2 nd stage cylinder head on top of a pair of cylinders
- Figure 5 shows a cross section of a 2nd stage cylinder head seen from the valve plate side
- Figure 6 shows a 2 nd stage cylinder head with an insert seen from the valve plate side
- FIG. 7 shows the insert
- Figure 8 shows the cylinder head of figure 6 without the insert. Detailed description
- FIG. 1 A cross section of a cylinder bank 13 where a prior art cylinder head 5 is placed on top of a pair of cylinder chambers 6 is shown in Figure 1.
- the cylinder head 5 is mounted to a cylinder body by screws or bolts through mounting holes 10 in the cylinder head 5.
- the cylinder banks 13 comprises one or more cylinders having a cylinder space or chamber 6 in which a piston can be moved to compress a refrigerant media, a cylinder head 5 and a valve plate 4.
- the cylinder head 5 forms a suction chamber 3 and a pressure chamber 2 (not shown in figure 1).
- the suction chamber 3 and the pressure chamber 2 is separated from each other by a separating wall in the cylinder head 5 and from the cylinder chamber 6 by the valve plate 4.
- the valve plate 4 is provided with a one way valve (not shown), which valve can be in a simple form, where valves are formed by resilient thin plate-shaped elements called valve tongues.
- Valve seats are formed by a plane valve plate 4 with inlet and/or outlet holes 9.
- the valve tongue is fastened in one end and can in its free end bend in relation to the valve plate 4.
- the valve tongue is placed on a pressure side of the valve plate 4.
- a piston (not shown) moves in the cylinder chamber 6 in an intake stroke
- the valve tongue will bend slightly and let in refrigerant through the suction opening 9 into the cylinder chamber 6.
- the valve tongue When the piston has moved into a bottom position and changes to move into an upward direction and into a compression stroke, the valve tongue will return to its unloaded position and will be pressed against the valve plate 4, closing the suction opening 9.
- the valve plate 4 is provided with more than one suction opening 9, a corresponding number of tongue valves are used.
- one or more tongue valves is configured to cover more than one suction opening 9.
- a similar valve arrangement can be placed.
- the tongue valve or valves are located on a side of the valve plate 4 opposite to the cylinder chamber 6. When the piston starts a compression stroke, the valve will open for exhausting refrigerant as long as the pressure in the cylinder chamber 6 is higher than the pressure in the pressure chamber 2 of the cylinder head 5.
- the suction chamber 3 is formed as a hollow cylinder head 5 showing a relatively large empty space or volume within the cylinder head 5.
- the purpose with the flow guide is to divide the flow with a minimum of changes of direction, and if possible having largest possible bending radiuses.
- the first aspect of this disclosure shows a flow guide 1 for a reciprocating-type compressor of a cooling system, the compressor comprising a pressure chamber 2 , a suction chamber 3 formed by a valve plate 4 and a cylinder head
- a cylinder chamber 6 placed on a side of the valve plate 4 opposite the cylinder head 5 wherein the flow guide 1 is formed directly in the cylinder head 5 by drilling, milling or molding of the cylinder head 5, providing the cylinder head 5 with one or more suction channels 7, guiding intake refrigerant from an inlet opening 8 of the cylinder head 5 to one or more suction openings 9 leading from the suction chamber 3 into the cylinder chamber 6.
- the suction chamber 3 is formed by the one or more channels 7.
- the second aspect of this disclosure shows a flow guide 1 for a reciprocating- type compressor of a cooling system, the compressor comprising a pressure chamber 2 , a suction chamber 3 formed by a valve plate 4 and a cylinder head
- a cylinder chamber 6 placed on a side of the valve plate 4 opposite the cylinder head 5, wherein the flow guide 1 is formed in the cylinder head 5 by an insert 11 , which insert 11 is provided with one or more channels 7, the insert 11 guiding intake refrigerant from an inlet opening 8 of the cylinder head 5 to one or more suction openings 9 leading from the suction chamber 3 into the cylinder chamber 6.
- suction chamber 3 is formed by channels 7 in the insert 11.
- the insert 11 is placed in a groove or space 12 formed in the cylinder head 5.
- Figures 5 to 8 shows the cylinder head 5 with the insert 11 and the cylinder head 5 with the insert 11 removed, showing the space 12 for the insert 11 , as well as the insert 11 alone.
- the cylinder head 5 is mounted to the compressor (not shown) by screws or bolts, through mounting holes 10 in the cylinder head 5.
- a gasket 14 or another kind of sealing means can be placed between the cylinder head 5 and the valve plate 4.
- a gasket can also be placed between the cylinders and the valve plate 4.
- each channel 7 is formed internally in the insert 11.
- each channel 7 is formed as a groove on an outer side of the insert 11.
- Providing the flow guide 1 as an insert 11, makes it possible to manufacture different configurations of the suction channels 7 in a cheap and easy way.
- the cylinder head 5 is configured in such a way that each channel 7, at an end abutting the inlet opening 8, has an opening diameter corresponding to a diameter of the inlet opening 8.
- the cylinder head 5 is configured in such a way that each channel 7 at an end abutting a suction opening 9 has an opening diameter corresponding to a diameter of the suction opening 9.
- the cylinder head 5 is configured in such a way that the number of channels 7 is joined with or in a mutual intake end or inlet opening 8 and at the opposite end of the channels 7, abutting the one or more suction openings 9 in the valve plate 4.
- the joining channels 7 can meet in a mutual spot, forming an intake or inlet 8 common for the channels 7 or the channels can all be connected to a space forming part of the suction chamber fluidly connected to the one or more suction openings 9 in the valve plate 4 through the channels 7.
- the flow guide 1 at least partly comprises a material having a thermal conductivity being lower than a thermal conductivity of a material of which a cylinder 13 and/or a cylinder head 5 is made of.
- the flow guide 1 at least partly comprises a ceramic material and/or a plastic material and/or a composite material including carbon fibers.
- the third aspect of this disclosure shows a reciprocating-type compressor for a cooling system, the compressor comprising a pressure chamber 2 , a suction chamber 3 formed by a valve plate 4 and a cylinder head 5, a cylinder chamber 6 placed on a side of the valve plate 4 opposite the cylinder head 5, wherein a flow guide 1 is formed directly in the cylinder head 5 by drilling, milling or molding of the cylinder head 5, providing the cylinder head 5 with one or more channels 7, guiding intake refrigerant from an inlet opening 8 of the cylinder head 5 to one or more suction openings 9 leading from the suction chamber 3 into the cylinder chamber 6.
- the fourth aspect of this disclosure shows a reciprocating-type compressor for a cooling system, the compressor comprising a pressure chamber 2, a suction chamber 3 formed by a valve plate 4 and a cylinder head 5, a cylinder chamber 6 placed on a side of the valve plate 4 opposite the cylinder head 5, wherein a flow guide 1 is formed in the cylinder head 5 by an insert 11 , which insert 11 is provided with one or more channels 7, the insert 11 guiding intake refrigerant from an inlet opening 8 of the cylinder head 5 to one or more suction openings 9 leading from the suction chamber 3 into the cylinder chamber 6.
- each channel 7 is formed internally in the insert 11.
- each channel 7 is formed as a groove on an outer side of the insert 11.
- each channel 7 at an end abutting the inlet opening 8 has an opening diameter corresponding to a diameter of the inlet opening 8.
- each channel 7 at an end abutting a suction opening 9 has an opening diameter corresponding to a diameter of the suction opening 9.
- the number of channels 7 is joined in a mutual inlet end 8 and in the opposite end of the channels 7, abutting the one or more suction openings 9 in the valve plate 4.
- the flow guide 1 at least partly comprises a material having a thermal conductivity being lower than a thermal conductivity of a material of which a cylinder 13 and/or a cylinder head 5 is made of.
- the flow guide 1 at least partly comprises a ceramic material and/or a plastic material and/or a composite material including carbon fibers.
- the fifth aspect of this disclosure shows use of a flow guide according to any of its embodiments in a reciprocating-type compressor for optimizing performance of the compressor.
- the sixth aspect of this disclosure shows a method of optimizing a reciprocating-type compressor of a cooling system, the compressor comprising a pressure chamber 2, a suction chamber 3 formed by a valve plate 4 and a cylinder head 5, a cylinder chamber 6 placed on a side of the valve plate 4 opposite the cylinder head 5, wherein the method comprises forming a flow guide 1 in the cylinder head 5 by drilling, milling or molding of the cylinder head 5, providing the cylinder head 5 with one or more channels 7, guiding intake refrigerant from an inlet opening 8 of the cylinder head 5 to one or more suction openings 9 leading from the suction chamber 3 into the cylinder chamber 6.
- the seventh aspect of this disclosure shows a method of optimizing a reciprocating-type compressor of a cooling system, the compressor comprising a valve plate 4, a cylinder head 5, a pressure chamber 2 and a suction chamber 3 formed by the valve plate 4 and the cylinder head 5, and a cylinder chamber 6 placed on a side of the valve plate 4, opposite the cylinder head 5, wherein the method comprises placing a flow guide 1 , formed by an insert 11, in the suction chamber 3, which insert 11 is provided with one or more channels 7, guiding intake refrigerant from an inlet opening 8 of the cylinder head 5 to one or more suction openings 9 leading from the suction chamber 3 into the cylinder chamber 6.
- the method comprises replacing the cylinder head 5 with a cylinder head 5 the method comprises one or more channels 7, guiding intake refrigerant from an inlet opening 8 of the cylinder head 5 to one or more suction openings 9 leading from the suction chamber 3 into the cylinder chamber 6.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA202070082A DK181078B1 (en) | 2020-02-12 | 2020-02-12 | FLOW CONDUCTOR FOR A PISTON COMPRESSOR IN A COOLING SYSTEM, PISTON COMPRESSOR FOR A COOLING SYSTEM AND CYLINDER HEAD FOR A PISTON COMPRESSOR FOR A COOLING SYSTEM |
PCT/EP2021/053448 WO2021160797A1 (en) | 2020-02-12 | 2021-02-12 | A flow guide for a reciprocating-type compressor of a cooling system and a reciprocating-type compressor for a cooling system comprising said flow guide |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4103839A1 true EP4103839A1 (en) | 2022-12-21 |
Family
ID=77292844
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21705171.3A Withdrawn EP4103839A1 (en) | 2020-02-12 | 2021-02-12 | A flow guide for a reciprocating-type compressor of a cooling system and a reciprocating-type compressor for a cooling system comprising said flow guide |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4103839A1 (en) |
DK (1) | DK181078B1 (en) |
WO (1) | WO2021160797A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH419755A (en) * | 1964-08-11 | 1966-08-31 | Burckhardt Ag Maschf | Concentric suction and pressure valve for high pressure compressors and pumps |
DE10341138A1 (en) * | 2003-09-06 | 2005-04-07 | Danfoss Compressors Gmbh | Refrigerant compressor has suction path extending as passage in channel element having direction change and which at least in region of direction change has at least one deflection element dividing suction path parallel to passage |
DE102008001540B4 (en) * | 2008-05-05 | 2011-11-17 | Neumann & Esser Maschinenfabrik Gmbh & Co. Kg | piston compressor |
CN104937268B (en) * | 2012-12-18 | 2017-03-22 | 艾默生环境优化技术有限公司 | Reciprocating compressor with vapor injection system |
DE102013203268A1 (en) | 2013-02-27 | 2014-08-28 | Bitzer Kühlmaschinenbau Gmbh | Refrigerant compressor |
CN107228061B (en) * | 2017-07-11 | 2020-04-21 | 江苏恒达动力科技发展股份有限公司 | Air compressor of body cooling integration |
-
2020
- 2020-02-12 DK DKPA202070082A patent/DK181078B1/en active IP Right Grant
-
2021
- 2021-02-12 EP EP21705171.3A patent/EP4103839A1/en not_active Withdrawn
- 2021-02-12 WO PCT/EP2021/053448 patent/WO2021160797A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
DK202070082A1 (en) | 2021-10-12 |
DK181078B1 (en) | 2022-11-25 |
WO2021160797A1 (en) | 2021-08-19 |
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