CN101999064A - Compressor for a refrigeration cycle, refrigeration cycle and method for operating the same - Google Patents
Compressor for a refrigeration cycle, refrigeration cycle and method for operating the same Download PDFInfo
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- CN101999064A CN101999064A CN2008801286070A CN200880128607A CN101999064A CN 101999064 A CN101999064 A CN 101999064A CN 2008801286070 A CN2008801286070 A CN 2008801286070A CN 200880128607 A CN200880128607 A CN 200880128607A CN 101999064 A CN101999064 A CN 101999064A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
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- 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
- F04B39/02—Lubrication
- F04B39/0207—Lubrication with lubrication control systems
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- 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
- F04B39/02—Lubrication
- F04B39/0223—Lubrication characterised by the compressor type
- F04B39/023—Hermetic compressors
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- 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
- F04B39/02—Lubrication
- F04B39/0223—Lubrication characterised by the compressor type
- F04B39/023—Hermetic compressors
- F04B39/0269—Hermetic compressors with device for spraying lubricant or with mist lubrication
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Compressor (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
A compressor (2) for a refrigeration cycle according to the invention comprises an inlet port (6), a compression element (10), an outlet port (18), wherein in operation a refrigerant flow (20) of a gaseous refrigerant carrying an amount of oil circulates through the inlet port (6), the compression element (10) and the outlet port (18), and an oil sump (8) in which part of the oil carried by the gaseous refrigerant collects. An oil circulation rate enhancement feature (16) is provided being configured so as to direct oil from the oil sump (8) to the refrigerant flow (20), when the oil in the oil sump (8) exceeds a predetermined oil sump level (24).
Description
Technical field
The present invention relates to a kind of compressor, kind of refrigeration cycle and operation method thereof that is used for kind of refrigeration cycle.
Background technology
In existing kind of refrigeration cycle, use a plurality of compressors that form one or more groups compressor.For the wearing and tearing of the moving-member that reduces compressor, as piston in the reciprocating compressor or the scroll in the screw compressor, the cold-producing medium that circulates in such compressor carries a certain amount of lubricant, particularly machine oil.Usually, cold-producing medium these oily parts of carrying are collected in the oil sump of compressor.
Each compressor has certain oily discharge rate or oil recycle ratio, and this depends on its design and running condition.The oil mass that the oil recycle ratio of compressor defines interior compressed machine conveying of unit interval and discharges from compressor.When a plurality of compressor operating in the kind of refrigeration cycle, particularly when using the compressor of different sizes with different oil recycle ratios, can occur that compressor damages owing to lacking lubricant when very little oily of their receptions, or when their receive too much when oily, compressor damages owing to oil hits (oil stroke).When this situation especially occurs in the amount that the oil that receives when the compressor in the refrigeration system with low oil recycle ratio can discharge more than them, and when the oil of the reception of the compressor in the refrigeration system with high oil recycle ratio is less than their required amounts that is used to lubricate.If one or more in these compressors are with the running of variable speed and have oil recycle ratio different with other compressor and discharge capacity, it is bad more that so this situation becomes.
For the distribution of employed oil in a plurality of compressors of balance, can expect using initiatively oil distribution system.Yet such active oil distribution system costs an arm and a leg, and brings the risk that lost efficacy and broke down to refrigeration system.
Summary of the invention
Therefore, be provided in the refrigeration system that to use more reliable and trouble-free compressor be useful.In addition, it is useful that the reliable and trouble-free operation of refrigeration system is provided, and the compressor with speed variable of different sizes moves in this refrigeration system.
Exemplary embodiment of the present invention comprises the compressor that is used for kind of refrigeration cycle, it comprises import, compressing member, outlet, wherein, be in operation, the cold-producing medium that carries the gas refrigerant of certain gauging flows circular flow through import, compressing member and outlet, also comprises oil sump, the part of the oil that is carried by gas refrigerant is collected in the oil sump, comprise that further oil recycle ratio strengthens feature, it is configured to when the oil in the oil sump surpasses predetermined oil sump level, and guiding is oily flows from the oil sump to the cold-producing medium.
Exemplary embodiment of the present invention also comprises a kind of kind of refrigeration cycle, it is included on the flow direction, at least one compressor, heat release heat exchanger, the pipeline that circulates therein of collection container, at least one evaporimeter and cold-producing medium preferably, this at least one evaporimeter has the expansion gear that is connected its upstream.
Exemplary embodiment of the present invention also comprises a kind of kind of refrigeration cycle, it comprises at least one low suction pressure compressor, at least one higher suction pressure compressor, the heat release heat exchanger, collection container preferably, at least one low suction pressure evaporimeter, the pipeline that at least one higher suction pressure evaporimeter and cold-producing medium circulate therein, this at least one low suction pressure evaporimeter has the expansion gear that is connected its upstream, this at least one higher suction pressure evaporimeter has the expansion gear that is connected its upstream, and wherein said at least one low suction pressure compressor is according to aforementioned arbitrary claim configuration.
Exemplary embodiment of the present invention also comprises the method for the compressor that is used for the running refrigerating circulation, it comprises the operation compressing member, flow circular flow through inlet, compressing member and outlet so that carry the cold-producing medium of the gas refrigerant of certain gauging, and a part that makes the oil that is carried by gas refrigerant is collected in the oil sump, comprise the steps: that also guiding oil flows when the oil in the oil sump surpasses predetermined oil sump level from the oil sump to the cold-producing medium.
Exemplary embodiment of the present invention also comprises the method that is used for the running refrigerating circulation, it comprises provides at least one low suction pressure compressor and at least one higher suction pressure compressor, this at least one low suction pressure compressor and at least one higher suction pressure compressor are connected in series and are configured to, when the oil sump level of low suction pressure compressor is lower than its predetermined oil sump level, its oil recycle ratio always is lower than the oil recycle ratio of higher suction pressure compressor, and when the oil sump level of low suction pressure compressor is higher than its predetermined oil sump level, its oil recycle ratio always is higher than the oil recycle ratio of higher suction pressure compressor, the operation compressing member flows circular flow through inlet so that carry the cold-producing medium of the gas refrigerant of certain gauging, compressing member and outlet, and a part that makes the oil that is carried by gas refrigerant is collected in the oil sump, in low suction pressure compressor, when the oil in the oil sump surpasses predetermined oil sump level, thereby guiding oil stream from the oil sump to the cold-producing medium is realized the self-regulation balance of the oil between low suction pressure compressor and the higher suction pressure compressor thus also to the higher suction pressure compressor that is connected the downstream.
Description of drawings
With reference to the accompanying drawings embodiments of the invention are done to describe more specifically, in the accompanying drawing:
Fig. 1 shows the schematic diagram of any type compressor according to an embodiment of the invention;
Fig. 2 shows the schematic diagram of reciprocating compressor according to an embodiment of the invention;
Fig. 3 shows the schematic diagram of screw compressor according to an embodiment of the invention;
Fig. 4 shows the diagrammatic side view of reciprocating compressor according to an embodiment of the invention;
Fig. 5 shows the first oil recycle ratio balance chart;
Fig. 6 shows the schematic diagram of the first multi-compressor refrigeration system according to an embodiment of the invention;
Fig. 7 shows the schematic diagram of the second multi-compressor refrigeration system according to an embodiment of the invention;
Fig. 8 shows the schematic diagram of the 3rd multi-compressor refrigeration system according to an embodiment of the invention; And
Fig. 9 shows the second oil recycle ratio balance chart.
The specific embodiment
Fig. 1 shows the compressor 2 of any type that uses in the kind of refrigeration cycle.
When compressing member 10 runnings, the cold-producing medium that carries the gas refrigerant of certain gauging flows 20 (it is by shown in the arrow among Fig. 1) import 6 of flowing through, compressing members 10 and exports 18.The part of the oil that gas refrigerant is entrained is separated in the way that flows to compressing member 10 and is fallen into oil sump 8, and is collected in wherein.Gas refrigerant is inhaled into compressing member 10 with remaining oil, compresses therein, and leaves compressor 2 at outlet 18 places.Oil from oil sump 8 is used for lubricating bearings, piston etc., and finally also leaves compressor 2, arrives the heat release heat exchanger that is connected its downstream.If the oil that the oil ratio of separating gives off is many, the oil level in the oil sump 8 raises so.
In normal oil level, the oil recycle ratio of compressor 2 is specified.In certain predetermined oil sump level, oil recycle ratio strengthens feature 16 and enters operation, and improves the oil recycle ratio of compressor 2.When the oil in the oil sump 8 surpasses predetermined oil sump level 24, this oil recycle ratio strengthen feature Final 16 system oil carry also guiding oil from oil sump 8 to cold-producing medium stream 20.
Fig. 2 shows the reciprocating compressor 26 that uses in kind of refrigeration cycle.
The oil sump 8 of reciprocating compressor 26 is formed on the lower left-hand side part of housing 4.Import 6 is attached at the upside of right-hand side part.Compressing member suction line 40 is arranged to directly adjacent with outlet 18, and at least a portion of mist of oil stream 42 and cold-producing medium stream 20 flows through compressing member suction line 40.The compressing member of reciprocating compressor 26 is formed by horizontally extending bent axle 12, and bent axle 12 is rotatably driven and piston rod 30 by motor 14, and described piston rod 30 and then driven plunger 32 are also compressed the cold-producing medium that carries oil in discharge chambe.The oil content that separates at interval with the left-hand side of the sweep of bent axle 12 blade 28 that looses is fixed to bent axle 12, rotatably to be driven by motor 14.The diffusing blade 28 of oil content has the function of slinger (slinger).When the oil in the oil sump 8 reached predetermined oil sump level 24, the described oil content blade 28 that looses was immersed in the oil sump 8 and disperses a certain amount of oil to form cooled dose of stream 20 entrained oil mists in crankcase.This quilt is carried the mist of oil that enters in the refrigerant gas stream 20 secretly and is inhaled in the discharge chambe, the result, and more oil is transferred out from compressor 26, thus oil recycle ratio will be improved.
Crankshaft rotating is shown in Reference numeral 36, and the motion of piston rod is shown in Reference numeral 38, and the dispersion campaign of mist of oil is shown in Reference numeral 34.
The design of the diffusing blade 28 of oil content will influence the characteristic of oil recycle ratio.From the oil content of the shaft centerline measurement of bent axle the loose outer radius of blade 28 and the increase level that diameter will be controlled oil recycle ratio.Its shape will provide the parameter of the function of oil recycle ratio as oil level.Selectively, can use and be fixed together with bent axle and with oily dispersion impeller or another feature of rotation therewith.
Use bent axle 12 self can reach identical dispersion effect as the instrument that increases oil recycle ratio.When the oil in the oil sump 8 reaches predetermined oil sump level 24, bent axle self will immerse in the oil sump 8, and disperse a certain amount of oil to flow 20 entrained oil mists to form cooled dose, increase oil recycle ratio thus.
If necessary, the additional features part can place on the bent axle, looses to amplify oil content further.
In these embodiments, flowing of mist of oil must be enough strong in the crankcase, in suction place (suction) that oil is delivered to compressing member 10.This can be by suitably selecting crankcase and realizing from the size that crankcase leads to the passage of compressing member 10.
In Fig. 2, adopt oil content 28 balances that realize oil recycle ratio that fall apart.
Fig. 3 shows the screw compressor 44 that uses in kind of refrigeration cycle.
In Fig. 3, bent axle 12 in the vertical direction basically extends, and import 6 is attached to the wall of left-hand side, and exports 18 upsides that are attached to housing 4.Bypass line 46 extends between point of entrainment 48 and import 6, and described point of entrainment 48 is positioned at the wall place of the left-hand side of crankcase 4, is in the height place of predetermined oil sump level 24 basically, and described import 6 links to each other with the suction line that leads to compressing member 10.Bypass line 46 can form hole, pipeline or pump line, and can be in the inside of compressor housing or outside as shown in the figure.
When the level of oil in the oil sump 8 surpasses predetermined oil sump level 24, will there be the oil of net flow to leave oil sump 8, to be carried secretly in the inlet flow that enters compressing member 10, this will increase the oil recycle ratio of compressor 44, and described predetermined oil sump level 24 equals specified oil level.This effect can be carried (static pressure entrainment) by static pressure secretly and be realized, when point of entrainment 48 during as far as possible near the suction line of compressing member 10, static pressure is minimum there, and the effect that static pressure is carried secretly is best.This effect also can be carried (dynamic pressure entrainment) by dynamic pressure secretly and be realized, for example by injector is provided.
Because bypass line 46 is connected to the point in the import 6 with point of entrainment 48 or is connected to import 6 suction line outward, so differential static pressure will cause considerable oil to be directed into cold-producing medium stream 20 from oil sump 8.
Oily supply flow in the bypass line 46 is by shown in the arrow 50.When providing pump or injector extraly, can increase from oil sump 8 to compressing member the oily supply flow of 10 suction line further.
Fig. 4 shows the reciprocating compressor 52 that uses in the kind of refrigeration cycle.
The essential structure that can see reciprocating compressor 52 from the side view of Fig. 4 comprises bent axle 12, piston rod 30 and the piston 32 of rotation.Different with bypass line 46, the bypass line 54 of reciprocating compressor 52 extends between point of entrainment 56 and compressing member suction line 58, described point of entrainment 56 is at predetermined oil sump level 24 places, the cold-producing medium stream 20 that the comprises oil stream 62 described compressing member suction line 58 of flowing through.Oily supply flow in the bypass line 54 is as shown in arrow 60.
In Fig. 3 and Fig. 4, the mode of carrying secretly by suction gas realizes the oil recycle ratio balance.
According to embodiments of the invention, as indicated above, when the oil sump level in the compressor is higher than rated value, increase the oil recycle ratio of compressor artificially.When the oil sump level in the oil sump was high, oil recycle ratio increased, and the oil mass of leaving compressor has surpassed the net flow of the oil that enters compressor.Like this, the oil sump level in the oil sump will reduce, until dropping to predetermined oil sump level and nominal level separately once more.At this moment, oil recycle ratio will reduce, and the oil mass of leaving compressor will be less than the oil mass that enters compressor.
According to embodiments of the invention, as described here, can realize self-regulation mechanism, be used for controlling the oil mass of employed compressor, and can be implemented in oily balance between the compressor in the multi-compressor system with passive or half passive mode.Thus, when having reduced use cost, improved system reliability.
Fig. 5 shows first oil recycle ratio balance Figure 64.
Figure 64 shows the variation of the oil recycle ratio of the oil sump level that depends on increase, i.e. tapering function f1 and step function f2 by two example function.
When the oil in the oil sump 8 has surpassed predetermined oil sump level 24, strengthen feature 16,28,46,54 or other any oil recycle ratios by oil recycle ratio and strengthen feature oil recycle ratio is increased, the fresh oil that makes the oil ratio that transports out from compressor enter compression wants many.
By regulating the operation intensity (intensity) of oil recycle ratio enhancing feature, can realize the adjusting of the more gradual change of oil recycle ratio, shown in f1, or the more adjusting of sudden change, shown in step function f2.
Fig. 6 shows the first multi-compressor refrigeration system 66.
The first multi-compressor refrigeration system 66 is included in the evaporimeter 74 of a group of three compressors 68, heat release heat exchanger 70, collection container 72 and three parallel connections on the flow direction, and described evaporimeter 74 has corresponding connection expansion valve 76 at its upstream.
The suction line that is divided into three separation from the suction line of this group evaporimeter 74 is used for each compressor of this group compressor 68, from the pressure piping of three compressors of this group compressor 68 before heat release heat exchanger 70 in conjunction with forming single pressure piping.Similarly, the pipeline from collection container 72 to this group evaporimeter 74 is divided into the pipeline of three separation, comes the suction line of flash-pot 74 to be used for this group compressor 68 in conjunction with forming single suction line.
If too many oil is collected in the oil sump of one or more compressors 68, then have the compressor 68 that oil recycle ratio strengthens feature by providing, as mentioned before, its oil recycle ratio will be distinguished adjusted and increase.In addition, obtained the reliable balance of the oil in the compressor 68 by simple and low cost method.By avoiding too many oil to be collected in the compressor, can guarantee to return the oil mass abundance of other compressors, and guarantee that the oil that they receive can be not very little.
Fig. 7 shows the second multi-compressor refrigeration system 68.
The second multi-compressor refrigeration system 78 comprises two groups of compressors (i.e. one group three low suction pressure compressors 80 and one group three middle suction pressure compressors 82), heat release heat exchanger 70, collection container 72 and the two groups of evaporimeters that are connected in parallel (i.e. first group three middle suction pressure evaporimeters 88 and second group low suction pressure evaporimeter 84) that are connected in series, suction pressure evaporimeter 88 has 90, the second groups low suction pressure evaporimeters 84 of expansion valve separately that are positioned at its upstream and has the expansion valve separately 86 that is positioned at its upstream in the middle of first group three.
The discharge line of low suction pressure evaporimeter 84 is merged into a public suction line, is divided into the suction line of three separation then, is used for each low suction pressure compressor 80.The pressure piping of low suction pressure compressor 80 is merged into a public suction line, the suction line that it is divided into three separation, suction pressure compressor 82 in the middle of being used for.The pressure piping of middle suction pressure compressor 82 is merged into a public pressure piping, leads to heat release heat exchanger 70.The discharge line of middle suction pressure evaporimeter 88 is merged into a public suction line, enters in the suction line of suction pressure compressor 82 in the middle of leading to.
For refrigeration system,, must think over the oil recycle ratio between low suction pressure compressor and the higher suction pressure compressor as the embodiment of Fig. 7 with compressors in series.
According to a particular embodiment of the invention, higher suction pressure compressor 82 is selected to has specified oil recycle ratio, and wherein, low suction pressure compressor 80 comprises that oil recycle ratio strengthens feature, as mentioned before, so that self-regulating cycling rate is provided.
Desired is, select the changeability of the oil recycle ratio between the compressor and the service condition of higher suction pressure compressor and low suction pressure compressor, make when the oil sump level of low suction pressure compressor is lower than rated value, their oil recycle ratio always is lower than in the higher suction pressure compressor, and when the oil sump level of low suction pressure compressor was higher than rated value, their oil recycle ratio always was higher than in the higher suction pressure compressor.Like this, can realize the self-regulation balance of the oil between higher suction pressure compressor and the low suction pressure compressor.
If have other pipeline in discharge place (discharge) of higher suction pressure compressor 82 with between than suction place of hanging down suction pressure compressor 80, this pipeline changes the oil recycle ratio that enters low suction pressure compressor 80, then when the oil sump level of low suction pressure compressor 80 was higher than predetermined level 24, the oil recycle ratio of low suction pressure compressor 80 must be higher than the highest possible oil recycle ratio that enters low suction pressure compressor 80.When the oil sump level was lower than predeterminated level 24, then oily discharge rate should be lower than the minimum possible oil recycle ratio that enters compressor.
Fig. 8 shows the 3rd multi-compressor refrigeration system 92.
The 3rd multi-compressor refrigeration system 92 is corresponding to the second multi-compressor refrigeration system 78, and its difference is that two groups of compressors are that one group three low suction pressure compressors 94 and one group three higher suction pressure compressors 96 are not connected in series, but are connected in parallel.
For above-mentioned purpose, the discharge line of low suction pressure evaporimeter 84 is merged into a public suction line, be used for the low suction pressure compressor 94 of this group, the suction line that it is divided into three separation then is used for each than low suction pressure compressor 94.Similarly, the discharge line of middle suction pressure evaporimeter 88 is merged into a public suction line, is used for this and organizes higher suction pressure compressor 96, and the suction line that it is divided into three separation then is used for each of higher suction pressure compressor 96.The pressure piping of low suction pressure compressor 94 is merged into a public pressure piping, and the pressure piping of higher suction pressure compressor 96 is merged into a public pressure piping, and these two pressure pipings combined before heat release heat exchanger 70.
In multi-compressor refrigeration system 78 and 92 among both, one or more oil recycle ratios that can one-tenth arranged according to the present invention comprise in the compressor strengthen feature, as mentioned before, when the oil in the oil sump surpassed predetermined oil sump level, oil recycle ratio strengthened feature guiding oil and flows to cold-producing medium from separately oil sump.
The heat release heat exchanger 70 of all multi-compressor refrigeration systems 68,78,92 can all be a gas cooler when moving under striding critical conduction mode, can all be condenser when operation under sub-critical mode perhaps.
According to further embodiment of the present invention, also series connection and compressor bank in parallel can be combined.
All aforesaid embodiment require to exist a balance in oil is carried, stable and within the specific limits, promptly not too low or too high to allow oil level in all compressor bank.Have the one or more compressors that strengthen feature according to the oil recycle ratio of the embodiment of the invention and realize this balance by providing, as described here.
Fig. 9 shows second oil recycle ratio balance Figure 98, and its test data by particular compressor derives, as the example of desired effects.
This Figure 98 shows both oil recycle ratios of low suction pressure compressor 94 and higher suction pressure compressor 96, it is the function of the oily flow (with the unit of being upgraded to) of increase, wherein, low suction pressure compressor 94 has according to oil recycle ratio enhancing feature of the present invention, therefore allow oil recycle ratio to regulate, wherein, higher suction pressure compressor 96 has the specified oil recycle ratio of scope in 0.8%-1.6%, as shown in second oil recycle ratio balance Figure 98.
As can be seen, its oil recycle ratio is filled (oil fill) along with the oil that increases and is changed neatly from the curve of low suction pressure compressor 94, thereby allows the reliability service of kind of refrigeration cycle.
In Fig. 9, the test data of shown low suction pressure reciprocating compressor is the function of oil sump level.Self-regulation notion of the present invention can clearly be found out from this figure.
According to further embodiment of the present invention, specified oil recycle ratio by guaranteeing higher suction pressure compressor is with respect to the specified oil recycle ratio height of low suction pressure compressor, can use the low suction pressure compressor of all size, and the danger that can between low suction pressure compressor, not produce oily equilibrium problem.Each low suction pressure compressor can the oil mass of self-regulation in its oil sump to reach level of security.Multiple low suction pressure compressor size for parallel connection, can realize the more approaching balance between the capacity of required capacity and conveying, this will cause low variation the between less ON/OFF circulation and the desired and actual suction pressure, and this will play the reliability that increases refrigeration system and reduce the effect that its energy consumes.
According to exemplary embodiment of the present invention, as mentioned before, the oil recycle ratio of compressor rather than the oil mass that enters are regulated.No longer need miscellaneous part to realize initiatively oil supply pipe reason, for the required change that produces a desired effect is dog-cheap, the reliability of system will improve, and overflowing of oil sump obtained avoiding reliably.Oil recycle ratio strengthens feature even can work in the system of complexity, as CO
2One of can relatively hang down in the suction pressure compressor of pressure charging system, the oil recycle ratio of higher therein suction pressure compressor is high about 10 times, and wherein the service condition of refrigeration system is changing.Can avoid exhausting of overflowing of oil and oil safely by exemplary embodiment of the present invention.
According to exemplary embodiment of the present invention, compressor has and is used for self-regulating mechanism, when a large amount of oil in kind of refrigeration cycle circulation time it is effective especially.
In certain embodiments of the invention, in public suction line, use the compressor of all size, go up required capacity at dynamic basis (dynamic basis) with matching system better.
All embodiment and advantage about compressor or refrigeration system as described herein after doing necessary the change, also can be used for moving the method for compressor and the method for running refrigerating system.Therefore, for fear of tediously long, just no longer repeated about such embodiment of these methods and advantage.
Though described the present invention with reference to exemplary embodiment, those skilled in the art should make various distortion without departing from the present invention and element is wherein done to be equal to replacement.In addition, under instruction of the present invention, and under the situation that does not break away from its essential scope, can make many modifications to adapt to special situation or material.Therefore, will be understood that the present invention is not limited to described exemplary embodiment, but the present invention will comprise all embodiment in the scope that falls into claims.
Reference numerals list
2 compressors
4 housings
6 imports
8 oil sumps
10 compressing members
12 bent axles
14 motors
16 oil recycle ratio Enhanced feature spares
18 outlets
20 cold-producing mediums stream
22 oil separate
24 predetermined oil sump levels
26 reciprocating compressors
The 28 oil contents blade that looses
30 piston rods
32 pistons
34 disperse motion
The rotation of 36 bent axles
38 piston rod movements
40 compressing member suction lines
42 mist of oils stream
44 compressors
46 bypass lines
48 point of entrainment
50 oily supply flows
52 reciprocating compressors
54 bypass lines
56 point of entrainment
58 compressing member suction lines
60 oily supply flows
62 oil streams
64 first oil recycle ratio balance charts
66 first multi-compressor refrigeration systems
68 compressor bank
70 heat release heat exchangers
72 collection containers
74 evaporimeters in parallel
76 expansion valves
78 second multi-compressor refrigeration systems
80 low suction pressure compressor bank
82 higher suction pressure compressor bank
84 low suction pressure evaporimeters
86 expansion valves
88 higher suction pressure evaporimeters
90 expansion valves
92 the 3rd multi-compressor refrigeration systems
94 low suction pressure compressor bank
96 higher suction pressure compressor bank
98 second oil recycle ratio balance charts
Claims (20)
1. be used for the compressor (2,26,44,52,68) of kind of refrigeration cycle (66,78,92), comprise import (6);
Compressing member (10);
Outlet (18);
Wherein, be in operation, the cold-producing medium that carries the gas refrigerant of certain gauging flows (20) circular flow through described import (6), described compressing member (10) and described outlet (18); And
Oil sump (8), the part of the oil that is carried by described gas refrigerant is collected in the described oil sump (8);
It is characterized in that:
Oil recycle ratio strengthens feature (16), and it is arranged to when the oil in the described oil sump (8) surpasses predetermined oil sump level (24), and guiding is oily flows (20) from described oil sump (8) to described cold-producing medium.
2. according to the compressor (2,26) of claim 1, it is characterized in that:
Described oil recycle ratio strengthens feature and is formed by the bent axle (12) that is rotatably driven by motor (14), described bent axle (12) is arranged to when the oil in the described oil sump (8) reaches described predetermined oil sump level (24), immerses in the described oil sump (8) and disperses a certain amount of oil to form by described cold-producing medium stream (20) entrained oil mist.
3. according to the compressor (2,26) of claim 1 or 2, it is characterized in that:
Described oil recycle ratio strengthens feature and is formed by the diffusing element (28) of oil content that is fixed to bent axle (12) and rotatably driven by motor (14), described oil content loose element (28) blade or dish in particular, the described oil content element (28) that looses is arranged to when the oil in the described oil sump (8) reaches predetermined oil sump level (24), immerses in the described oil sump (8) and disperses a certain amount of oil to form by described cold-producing medium stream (20) entrained oil mist.
4. according to the compressor (44,52) of claim 1, it is characterized in that:
Described oil recycle ratio strengthens feature and is formed by bypass line (46,54), described bypass line (46,54) the height place of the described predetermined oil sump level of being positioned at substantially of described oil sump (8) (24) and described cold-producing medium stream (20) be positioned at compressor or extend between described compressing member (10) position before the outside.
5. according to the compressor (44,52) of claim 4, it is characterized in that:
Injector is set, is used for oil is sent to described cold-producing medium stream (20) from described oil sump (8).
6. according to the compressor (44,52) of claim 4, it is characterized in that:
Carry secretly by static pressure oil is sent to described cold-producing medium stream (20) from described oil sump (8).
7. according to each compressor (44) in the claim 4 to 6, it is characterized in that:
Described bypass line (46) extends between the height place of the described predetermined oil sump level of being in of described oil sump (8) (24) and described import (6).
8. according to each compressor (44) in the claim 4 to 6, it is characterized in that:
Described bypass line (46) is at the height place of the described predetermined oil sump level of being in of described oil sump (8) (24) and be connected between the suction line of described import (outside) and extend.
9. according to each compressor (52) in the claim 4 to 6, it is characterized in that:
Described bypass line (54) sucks between the part at the height place of the described predetermined oil sump level of being in of described oil sump (8) (24) and compressing member suction line (58) or compressing member and extends.
10. kind of refrigeration cycle (66) comprising:
On flow direction, at least one is according to each compressor (68), heat release heat exchanger (70), the pipeline of collection container (72), at least one evaporimeter (74) and cold-producing medium circular flow warp preferably in the aforementioned claim, and described at least one evaporimeter (74) has connection expansion gear (76) at its upstream.
11. kind of refrigeration cycle (78,92) is characterized in that:
At least one low suction pressure compressor (80,94), at least one higher suction pressure compressor (82,96), heat release heat exchanger (70), collection container (72) preferably, at least one low suction pressure evaporimeter (84), the pipeline of at least one higher suction pressure evaporimeter (88) and cold-producing medium circular flow warp, described at least one low suction pressure evaporimeter (84) has the expansion gear (86) that is connected to its upstream, described at least one higher suction pressure evaporimeter (88) has the expansion gear (90) that is connected to its upstream, wherein, described at least one low suction pressure compressor (80,92) according to each setting in the aforementioned claim.
12., comprise compressor (80,92) with different sizes according to the kind of refrigeration cycle (78,92) of claim 11.
13. according to the kind of refrigeration cycle (92) of claim 11 or 12, wherein, described at least one low suction pressure compressor (94) and described at least one higher suction pressure compressor (96) are connected in parallel.
14. according to the kind of refrigeration cycle (78) of claim 11 or 12, wherein, described at least one low suction pressure compressor (80) and described at least one higher suction pressure compressor (82) are connected in series.
15. kind of refrigeration cycle (78) according to claim 13 or 14, wherein, described low suction pressure compressor (80) and described higher suction pressure compressor (82) are arranged to when the oil sump level (8) of described low suction pressure compressor (80) is lower than its predetermined oil sump level (24), and its oil recycle ratio always is lower than the oil recycle ratio of described higher suction pressure compressor (82).
16. kind of refrigeration cycle (78) according to claim 15, wherein, described low suction pressure compressor (80) and described higher suction pressure compressor (82) are arranged to when the oil sump level (8) of described low suction pressure compressor (80) surpasses its predetermined oil sump level (24), and its oil recycle ratio always is higher than the oil recycle ratio of described higher suction pressure compressor (82).
17. according to each kind of refrigeration cycle (78) in the claim 11 to 16, wherein, described low suction pressure compressor (80) is arranged to described when the oil sump level (8) of hanging down suction pressure compressor (80) is lower than its predetermined oil sump level (24), and its oil recycle ratio always is lower than the oil recycle ratio that enters described low suction pressure compressor (80).
18. according to each kind of refrigeration cycle (78) in the claim 11 to 17, wherein, described low suction pressure compressor (80) is arranged to when the oil sump level (8) of described low suction pressure compressor (80) surpasses its predetermined oil sump level (24), and its oil recycle ratio always is higher than the oil recycle ratio that enters described low suction pressure compressor (80).
19. be used for the method for the compressor (2,26,44,52,68) of running refrigerating circulation (66,78,92), comprise:
Operation compressing member (10) flows (20) circular flow through import (6), described compressing member (10) and outlet (18) so that carry the cold-producing medium of the gas refrigerant of certain gauging, and a part that makes the oil that is carried by described gas refrigerant is collected in the described oil sump (8)
It is characterized in that following steps:
When the oil in the described oil sump (8) surpassed predetermined oil sump level (24), guiding oil flowed (20) from described oil sump (8) to described cold-producing medium.
20. be used for the method for running refrigerating circulation (78), comprise:
At least one low suction pressure compressor (80) and at least one higher suction pressure compressor (82) are provided, described at least one low suction pressure compressor (80) and at least one higher suction pressure compressor (82) are connected in series and are arranged so that, when the oil sump level of described low suction pressure compressor (80) is lower than its predetermined oil sump level (24), its oil recycle ratio always is lower than the oil recycle ratio of described higher suction pressure compressor (82), and when the oil sump level of described low suction pressure compressor (80) surpassed its predetermined oil sump level, its oil recycle ratio always was higher than the oil recycle ratio of described higher suction pressure compressor (82);
Operation compressing member (10) flows (20) circular flow through import (6), described compressing member (10) and outlet (18) so that carry the cold-producing medium of the gas refrigerant of certain gauging, and the part of the oil that is carried by described gas refrigerant is collected in the described oil sump (8);
In described low suction pressure compressor (80), when the oil in the described oil sump (8) surpasses predetermined oil sump level (24), guiding oil flows (20) thereby also to the described higher suction pressure compressor (82) that is connected the downstream, realizes the self-regulation balance of the oil between described low suction pressure compressor (80) and the described higher suction pressure compressor (82) thus from described oil sump (8) to described cold-producing medium.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2008/004734 WO2009149726A1 (en) | 2008-06-12 | 2008-06-12 | Compressor for a refrigeration cycle, refrigeration cycle and method for operating the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101999064A true CN101999064A (en) | 2011-03-30 |
Family
ID=40350024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008801286070A Pending CN101999064A (en) | 2008-06-12 | 2008-06-12 | Compressor for a refrigeration cycle, refrigeration cycle and method for operating the same |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20110081254A1 (en) |
| EP (1) | EP2283284B1 (en) |
| CN (1) | CN101999064A (en) |
| DK (1) | DK2283284T3 (en) |
| WO (1) | WO2009149726A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062052A (en) * | 2011-10-20 | 2013-04-24 | 丹佛斯商用压缩机有限公司 | Refrigeration compressor |
| CN104641116A (en) * | 2012-07-31 | 2015-05-20 | 比策尔制冷机械制造有限公司 | Suction header arrangement for oil management in multiple-compressor systems |
| CN104641117A (en) * | 2012-07-31 | 2015-05-20 | 比策尔制冷机械制造有限公司 | Method of active oil management for multiple scroll compressors |
| CN105518298A (en) * | 2013-08-08 | 2016-04-20 | 艾默生环境优化技术有限公司 | Variable capacity reciprocating compressor |
| CN104641117B (en) * | 2012-07-31 | 2016-11-30 | 比策尔制冷机械制造有限公司 | Active oil management method for multiple screw compressors |
| US10760831B2 (en) | 2016-01-22 | 2020-09-01 | Bitzer Kuehlmaschinenbau Gmbh | Oil distribution in multiple-compressor systems utilizing variable speed |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2663817B1 (en) * | 2011-01-14 | 2018-10-17 | Carrier Corporation | Refrigeration system and method for operating a refrigeration system |
| US10598416B2 (en) | 2013-11-04 | 2020-03-24 | Carrier Corporation | Refrigeration circuit with oil separation |
| US9939179B2 (en) | 2015-12-08 | 2018-04-10 | Bitzer Kuehlmaschinenbau Gmbh | Cascading oil distribution system |
| CN107747544B (en) * | 2017-11-07 | 2019-07-09 | 苏州英华特涡旋技术有限公司 | A kind of compressor with oil equalizing pipe, parallel compressor group and oily method |
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| DE3424450A1 (en) * | 1984-07-03 | 1986-01-09 | Siemens AG, 1000 Berlin und 8000 München | Enclosed motor compressor |
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- 2008-06-12 DK DK08773413.3T patent/DK2283284T3/en active
- 2008-06-12 US US12/937,501 patent/US20110081254A1/en not_active Abandoned
- 2008-06-12 CN CN2008801286070A patent/CN101999064A/en active Pending
- 2008-06-12 WO PCT/EP2008/004734 patent/WO2009149726A1/en active Application Filing
- 2008-06-12 EP EP08773413.3A patent/EP2283284B1/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062052A (en) * | 2011-10-20 | 2013-04-24 | 丹佛斯商用压缩机有限公司 | Refrigeration compressor |
| CN104641116A (en) * | 2012-07-31 | 2015-05-20 | 比策尔制冷机械制造有限公司 | Suction header arrangement for oil management in multiple-compressor systems |
| CN104641117A (en) * | 2012-07-31 | 2015-05-20 | 比策尔制冷机械制造有限公司 | Method of active oil management for multiple scroll compressors |
| CN104641117B (en) * | 2012-07-31 | 2016-11-30 | 比策尔制冷机械制造有限公司 | Active oil management method for multiple screw compressors |
| US9689386B2 (en) | 2012-07-31 | 2017-06-27 | Bitzer Kuehlmaschinenbau Gmbh | Method of active oil management for multiple scroll compressors |
| CN105518298A (en) * | 2013-08-08 | 2016-04-20 | 艾默生环境优化技术有限公司 | Variable capacity reciprocating compressor |
| CN105518298B (en) * | 2013-08-08 | 2017-10-27 | 艾默生环境优化技术有限公司 | Variable displacement reciprocating compressor |
| US10145372B2 (en) | 2013-08-08 | 2018-12-04 | Emerson Climate Technologies, Inc. | Variable capacity reciprocating compressor |
| US10760831B2 (en) | 2016-01-22 | 2020-09-01 | Bitzer Kuehlmaschinenbau Gmbh | Oil distribution in multiple-compressor systems utilizing variable speed |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009149726A1 (en) | 2009-12-17 |
| EP2283284A1 (en) | 2011-02-16 |
| EP2283284B1 (en) | 2018-09-12 |
| DK2283284T3 (en) | 2019-01-07 |
| US20110081254A1 (en) | 2011-04-07 |
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