CN103363724A - Oil balance device for oil balance between compressors - Google Patents
Oil balance device for oil balance between compressors Download PDFInfo
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- CN103363724A CN103363724A CN2012101024451A CN201210102445A CN103363724A CN 103363724 A CN103363724 A CN 103363724A CN 2012101024451 A CN2012101024451 A CN 2012101024451A CN 201210102445 A CN201210102445 A CN 201210102445A CN 103363724 A CN103363724 A CN 103363724A
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- 239000007924 injection Substances 0.000 claims description 32
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- 230000005484 gravity Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 301
- 239000010687 lubricating oil Substances 0.000 abstract description 8
- 238000005057 refrigeration Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000010725 compressor oil Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
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Abstract
The invention discloses an oil balance device for oil balance between compressors. The compressors comprise a first compressor and a second compressor. An air suction pipeline of the first compressor and an air suction pipeline of the second compressor are connected together in parallel, and an air exhaust pipeline of the first compressor and an air exhaust pipeline of the second compressor are also connected together in parallel. The oil balance device comprises an ejecting oil path and an air supply pipeline, wherein the ejecting oil path is connected with the first compressor and the second compressor, an ejector is arranged in the ejecting oil path, the air supply pipeline is used for supplying driving gas for the ejector, and the ejector supplies oil in an oil-rich compressor in the first compressor and the second compressor for an oil-short compressor in the first compressor and the second compressor under the driving of the driving gas. Oil-short compressors in a multi-compressor system or compressors with possible oil-short risks are supplied with lubricating oil actively, and accordingly the oil balance in the multi-compressor system is ensured.
Description
Technical Field
The invention relates to the field of compressors, in particular to an oil balancing device for oil balance among compressors.
Background
In refrigeration systems it is sometimes necessary to use multiple compressors simultaneously. For example, the parallel compressor technology is increasingly used in the air conditioning and refrigeration industry. The parallel compressors have the advantages of convenient energy adjustment, convenient shutdown and maintenance of a single compressor, low cost and the like. Lubricating oil is indispensable in the operation of the compressor. However, due to different displacement among compressors, different pipeline designs and the like, a certain compressor may be burnt out due to lack of lubricating oil, especially a scroll compressor with a low-pressure cavity. Therefore, it is necessary to manage the oil levels of the plurality of compressors. In the current oil level management, an active oil return device widely applied in the refrigeration industry can be adopted, but the cost is high, the system structure is complex, and the method is not suitable for the fields of commercial and light commercial air conditioners. The use of a through-line design is also possible, but these approaches do not provide very reliable control of compressor oil level safety. Therefore, the existing oil level management cannot satisfy both low cost and high reliability.
Disclosure of Invention
An object of the present invention is to provide an oil balancing device capable of accurately and effectively controlling oil supply balance between compressors to ensure coordinated operation of a plurality of compressors.
The invention also aims to provide an oil balancing device which is simple and light in structure, low in cost and suitable for multiple compressors, particularly parallel compressors.
In order to achieve the above object, the technical solution of the present invention is achieved by:
according to an aspect of the present invention, there is provided an oil balancing apparatus for oil balancing between compressors, the compressors including a first compressor and a second compressor, suction lines of the first compressor and the second compressor being connected in parallel, discharge lines of the first compressor and the second compressor being also connected in parallel, the oil balancing apparatus comprising:
the injection oil way is connected with the first compressor and the second compressor, and an injector is arranged in the injection oil way; and
a gas supply line for supplying a driving gas to the ejector,
the ejector is driven by driving gas to supply oil in an oil-rich compressor of the first compressor and the second compressor to an oil-deficient compressor of the first compressor and the second compressor through the ejector oil way.
Further, the ejector may be a venturi.
Further, an ejector control valve may be provided in the gas supply line for controlling opening and closing of supply of the driving gas to the ejector.
Still further, the driving gas may be a gas discharged from the first compressor or the second compressor.
Further, the oil balancing device can further comprise an oil level monitor, the oil level monitor is used for monitoring the oil level of the oil-deficient compressor, and the injection control valve is opened under the condition that the monitored oil level is lower than a threshold value, so that the injector supplies oil in the oil-rich compressor to the oil-deficient compressor through the injection oil way.
Further, the ejector can directly supply oil to an oil pool in the oil-deficient compressor through an ejection oil path; alternatively, the ejector may supply oil to the suction inlet of the oil-starved compressor via an ejector oil path.
Specifically, the oil balancing device may further include an oil balancing pipe that communicates the oil sump in the first compressor and the oil sump in the second compressor, so that oil in the oil-rich compressor of the first compressor and the second compressor is replenished to the oil-poor compressor of the first compressor and the second compressor through the oil balancing pipe under the action of gravity.
Specifically, an oil port of the rich oil compressor connected with the injection oil path may be located at a standard oil level height.
According to another aspect of the present invention, there is provided an oil balancing apparatus for oil balancing between compressors including a first compressor and a second compressor, the oil balancing apparatus comprising:
the first injection oil way and the second injection oil way are used for connecting the first compressor and the second compressor, a first injector is arranged in the first injection oil way, and a second injector is arranged in the second injection oil way; and
a first gas supply line for supplying a first driving gas to the first ejector and a second gas supply line for supplying a second driving gas to the second ejector,
the first ejector supplies oil in the second compressor to the first compressor through the first ejector oil path under the drive of first driving gas, and the second ejector supplies oil in the first compressor to the second compressor through the second ejector oil path under the drive of second driving gas.
Further, both the first ejector and the second ejector may be venturis.
Furthermore, a first injection control valve may be disposed in the first gas supply line, and is configured to control opening and closing of supply of the first driving gas to the first injector; the second gas supply line may be provided therein with a second ejector control valve for controlling opening and closing of supply of a second driving gas to the second ejector, the first driving gas being a gas discharged from any one of the first compressor and the second compressor, the second driving gas being a gas discharged from any one of the first compressor and the second compressor.
Specifically, the first ejector can directly supply oil to an oil pool in the first compressor through a first ejector oil path, and the second ejector can directly supply oil to an oil pool in the second compressor through a second ejector oil path; or,
the first ejector may supply oil to the suction inlet of the first compressor via a first ejector oil passage, and the second ejector may supply oil to the suction inlet of the second compressor via a second ejector oil passage.
Specifically, the oil supply to the first compressor via the first pilot oil passage and the oil supply to the second compressor via the second pilot oil passage may be performed alternately, and the discharge lines of the first compressor and the second compressor are connected in parallel, and the suction line is also connected in parallel.
Specifically, the first injection oil path may sequentially include a first branch, a common line and a second branch along the flow direction of oil, the second injection oil path sequentially includes a third branch, the common line and a fourth branch along the flow direction of oil, a first end of the first branch is connected to an oil port of a second compressor, a second end of the first branch and a first end of the fourth branch are connected to a first node with a first end of the common line, a first end of the second branch and a second end of the third branch are connected to a second node with a second end of the common line, a second end of the second branch is connected to an air suction inlet of the first compressor, a first end of the third branch is connected to the oil port of the first compressor, a second end of the fourth branch is connected to the air suction inlet of the second compressor, a first injector and a first check valve are sequentially disposed in the first branch along the flow direction of oil, the second branch is provided with a second branch control valve for controlling the on-off of the second branch, the third branch is sequentially provided with a second ejector and a second one-way valve along the flow direction of oil, the fourth branch is provided with a fourth branch control valve for controlling the on-off of the fourth branch, the first one-way valve only allows the oil to flow from the first end of the first branch to the second end of the first branch, and the second one-way valve only allows the oil to flow from the first end of the third branch to the second end of the third branch.
More specifically, the second and fourth bypass control valves may be configured to: the fourth branch control valve is turned off when the second branch control valve is opened, and the second branch control valve is turned off when the fourth branch control valve is opened.
More specifically, the oil balancing device may further include an oil return branch connected between the discharge outlet and the suction inlet of the first compressor and/or between the discharge outlet and the suction inlet of the second compressor, the oil return branch including an oil-gas separation element, an oil return branch control valve, and a capillary tube in order in a direction in which oil flows, gas discharged from the first compressor and/or the second compressor being supplied as the first and/or second driving gas to the second air supply line and/or the first air supply line after passing through the oil-gas separation element.
More specifically, the oil port of the first compressor connected to the second injection oil path and the oil port of the second compressor connected to the first injection oil path may be located at a standard oil level of the first compressor and at a standard oil level of the second compressor, respectively.
At least one aspect of the technical scheme of the present invention can actively supply lubricating oil to the oil-deficient compressors or the compressors which may have an oil-deficient risk in the multi-compressor system by providing the injection oil line provided with the ejector and the corresponding air supply line, so as to ensure oil balance in the multi-compressor system, and prevent the fault of the whole system caused by the oil shortage of the single compressor in the plurality of compressors. The oil balancing device is particularly suitable for parallel low-pressure cavity vortex compressors.
Drawings
FIG. 1 shows a schematic view of an oil balancing device for oil balancing between compressors according to an embodiment of the present invention;
FIG. 2 shows a schematic view of an oil balancing device for oil balancing between compressors according to an embodiment of the present invention;
FIG. 3 shows a schematic view of an oil balancing device for oil balancing between compressors according to an embodiment of the present invention; and
fig. 4 shows a schematic view of an oil balancing device for oil balancing between compressors according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the invention.
The embodiment of the invention provides an oil balancing device which is applied to a multi-compressor system and can quickly and reliably ensure the oil balance among compressors.
Fig. 1 schematically shows an oil balancing apparatus 100 for oil balancing between compressors according to an embodiment of the present invention. The illustrated compressors include a first compressor C12 and a second compressor C22. In the embodiment shown in fig. 1, the first compressor C12 and the second compressor C22 are connected in parallel with each other, i.e., the suction lines 104 of the first compressor C12 and the second compressor C22 are connected in parallel, and the discharge lines 105 of the first compressor C12 and the second compressor C22 are also connected in parallel. The oil balancing device 100 includes an injection oil passage 101 and an air supply passage 103. The injection oil path 101 connects the first compressor C12 and the second compressor C22. An ejector 102 is provided in the ejector oil passage 101, and a gas supply passage 103 supplies driving gas to the ejector 102. The ejector 102 may supply the oil in the second compressor C22 to the first compressor C12 via the ejector oil passage 101 under the drive of the drive gas. In the embodiment shown in fig. 1, the first compressor C12 is an oil-starved compressor and the second compressor C22 is an oil-rich compressor.
By an oil starvation compressor is meant a compressor in which the amount of oil is less than the standard amount of oil at which the compressor operates, or relatively small compared to other associated compressors. By a rich compressor, in contrast, is meant a compressor in which the amount of oil is greater than the standard amount of oil at which the compressor operates, or is relatively large compared to other associated compressors. In an actual multi-compressor system, the oil-deficient compressor and the oil-rich compressor may be caused by actual use conditions, or may be intentionally designed by a designer, for example, oil in one or some compressors in the system may be consumed to be lower than a standard oil amount level before other compressors by various ways such as oil level difference, oil supply sequence, oil consumption, and the like, so as to form the oil-deficient compressor, or otherwise, the oil-rich compressor may be formed. In the present application, "oil" refers to lubricating oil required for the operation of the compressor.
In one example, the eductor 102 may be a venturi. In one example, a bleed control valve 110 is provided in the gas supply line 103. The injector control valve 110 is used to control the supply of the driving gas to the injector 102. For example, when the amount of oil in the first compressor C12 is below a standard oil level, the eductor control valve 110 is opened to supply drive gas to the eductor 102 to supply oil from the second compressor C22 to the first compressor C12; conversely, if the amount of oil in the first compressor C12 is not below the standard oil level, the bleed control valve 110 may be closed.
As an example, the driving gas may be a gas having a certain pressure, and for convenience of use and avoidance of addition of additional structures, a gas discharged from the first compressor C12 or the second compressor C22 may be used as the driving gas. Since the compressor mainly converts the sucked low-pressure gas into high-pressure gas to be discharged, the discharged gas can be used as the driving gas of the ejector 102, so that the gas source of the driving gas can be omitted to simplify the structure. Of course, this is not required and one skilled in the art may also use additional drive gas to drive the eductor 102, such as providing additional drive gas supply means.
As an example, both ends of the injection oil passage 101 may be directly connected to an oil sump in the rich compressor and an oil sump in the lean compressor, respectively. That is, the eductor 102 may supply oil directly to an oil sump in the under oil compressor via the eductor oil passage 101. In yet another example, the bleed oil passage 101 may be connected to the suction inlet 107 of the under oil compressor, rather than directly to the oil sump of the under oil compressor. That is, the ejector 102 supplies oil to the suction inlet 107 of the oil-starved compressor via the ejector oil passage 101. In the latter case, the oil supplied to the oil-deficient compressor is mixed with the working gas sucked by the oil-deficient compressor, and the working gas can play a certain buffering role on the oil supplied to the oil-deficient compressor to inhibit the fluctuation caused by the temperature or the flow rate of the lubricating oil, so that the lubricating oil can enter the oil-deficient compressor more uniformly and stably.
In an example, the oil balancing apparatus 100 may further include an oil balancing tube 106. The oil balance pipe 106 connects the oil sump in the first compressor C12 and the oil sump in the second compressor C22, so that the oil in the oil-rich compressors in the first compressor C12 and the second compressor C22 is supplemented to the oil-deficient compressors in the first compressor C12 and the second compressor C22 via the oil balance pipe 106 under the action of gravity. This can maintain the balance of the oil amounts of the first and second compressors C12 and C22 to some extent, especially in the case where the oil amounts of the first and second compressors C12 and C22 are changed slowly. However, the oil balancing pipe 106 is not essential to the oil balancing device 100.
According to an embodiment of the present invention, the oil balancing device 100 may further include an oil level monitor 111, such as the oil balancing device 100' shown in fig. 2. The oil level monitor 111 is used to monitor the oil level of the under oil compressor in order to determine whether the under oil compressor should be supplied with oil. In the event that the monitored oil level is below a threshold (e.g., a standard oil level), the eductor control valve 110 may be opened to cause the eductor 102 to supply oil from the rich compressor to the lean compressor via the eductor oil passage 101. The oil level monitor 111 may be, for example, an oil level switch, or other such liquid level sensor. However, the oil level monitor 111 is not essential to the oil balancing device 100, and an operator may determine whether or not oil needs to be replenished for the oil-deficient compressor by observation or experience, for example.
In any of the embodiments and examples thereof described previously, the oil port 109 connecting the rich compressor to the bleed oil passage 101 may be provided at a standard oil level height. In general, the standard oil level is set at the time of shipment of the compressor, and may be set near the center line of the oil scope.
In this way, when the oil level of the rich compressor drops below the standard oil level, the ejector 102 will not extract oil from the rich compressor any more, so that the formation of an under-oil compressor due to the rich compressor being in an under-oil state due to excessive extraction of oil from the rich compressor can be avoided.
Fig. 3 illustrates an oil balancing apparatus 300 for oil balancing between compressors, which also includes a first compressor C13 and a second compressor C23, according to an embodiment of the present invention. The oil balancing device 300 includes: the first injection oil way 3011, the second injection oil way 3012, the first air supply line 3031 and the second air supply line 3032. The first pilot oil path 3011 and the second pilot oil path 3012 both connect the first compressor C13 and the second compressor C23. A first ejector 3021 is arranged in the first ejector oil path 3011, and a second ejector 3022 is arranged in the second ejector oil path 3012. The first gas supply line 3031 is used to supply the first driving gas to the first ejector 3021, and the second gas supply line 3032 is used to supply the second driving gas to the second ejector 3022. The first ejector 3021 supplies the oil in the second compressor C23 to the first compressor C13 through the first ejection oil path 3011 under the drive of the first driving gas, and the second ejector 3022 supplies the oil in the first compressor C13 to the second compressor C23 through the second ejection oil path 3012 under the drive of the second driving gas.
Unlike the previous embodiment, in this embodiment, the oil in the first and second compressors C13 and C23 may be supplemented with each other. That is, in such an embodiment, there is no need to deliberately distinguish between an oil-starved compressor and an oil-rich compressor, but oil balancing may be achieved by complementary oil charging of the two compressor phases.
In one example, both the first eductor 3021 and the second eductor 3022 may be venturis. In one example, the first air supply line 3031 may be provided with a first injection control valve 3101 for controlling the opening and closing of the supply of the first driving gas to the first injector 3021. The second gas supply line 3032 may be provided with a second ejector control valve 3102 for controlling the opening and closing of the supply of the second driving gas to the second ejector 3022.
Similar to the previous embodiment, the first and second bleed control valves 3101 and 3102 may be controlled by monitoring the amount of oil in the first and second compressors C13 and C23 to regulate the supply of oil to the first and second compressors C13 and C23 via the first and second bleed oil lines 3011 and 3012, respectively, to ensure that the oil in both the first and second compressors C13 and C23 is not below a standard oil level. On the other hand, an alternate oil supply form may be adopted, in which the oil supply to the first compressor C13 via the first pilot oil passage 3011 and the oil supply to the second compressor C23 via the second pilot oil passage 3012 are alternately performed. In one example, the alternate supply of oil may be accomplished by first opening one of the first and second bleed control valves 3101 and 3102 and closing the other, and after a period of time, closing the previously opened bleed control valve and opening the previously closed bleed control valve, and so on.
Similar to the previous embodiment, the first driving gas may be a gas discharged from the second compressor C23 or the first compressor C13, and the second driving gas may also be a gas discharged from the second compressor C23 or the first compressor C13. Of course, this is not required and those skilled in the art may also use additional drive gas to drive the first eductor 3021 and the second eductor 3022, for example to provide additional drive gas supply means.
As an example, both ends of the first pilot oil passage 3011 may be directly connected to an oil sump in the first compressor C13 and an oil sump in the second compressor C23, respectively, similarly to the previous embodiment. That is, the first eductor 3021 may directly supply oil to the oil sump in the first compressor C13 via the first eductor oil path 3011. In yet another example, the first pilot oil path 3011 may be connected to the suction inlet 3071 of the first compressor C13 instead of being directly connected to the oil sump of the first compressor C13. That is, the first ejector 3021 may supply oil to the suction inlet 3071 of the first compressor C13 via the first ejector oil path 3011. Similarly, the second pilot oil path 3012 may be connected to the suction inlet 3072 of the second compressor C23, or may be directly connected to an oil sump of the second compressor C23. That is, the second ejector 3022 may supply the oil directly to the oil sump of the second compressor C23 through the second ejector oil passage 3012, or may supply the oil to the suction inlet 3072 of the second compressor C23 through the second ejector oil passage 3012.
As an example, similar to the previous embodiment, the first and second compressors C13 and C23 may be connected in parallel, i.e., their discharge lines are connected in parallel, and their suction lines are also connected in parallel.
The above embodiments are directed to compressors in parallel, in particular to compressors arranged in parallel in a modular unit. However, the invention is also applicable to achieving oil balance between compressors in different modular units.
Fig. 4 shows a schematic view of an oil balancing device 400 for oil balancing between compressors in different modular units according to an embodiment of the present invention. Wherein the first compressor C14 and the second compressor C24 are located in two different modular units, respectively. Similar to the embodiment shown in fig. 3, the oil balancing device 400 includes first and second pilot oil passages 4011 and 4012, and first and second air supply passages 4031 and 4032. The first ejector oil way 4011 and the second ejector oil way 4012 connect the first compressor C14 and the second compressor C24, a first ejector 4021 is arranged in the first ejector oil way 4011, and a second ejector 4022 is arranged in the second ejector oil way 4012. The first gas supply line 4031 is used to supply a first drive gas to the first eductor 4021 and the second gas supply line 4032 is used to supply a second drive gas to the second eductor 4022. The first ejector 4021 supplies oil in the second compressor C24 to the first compressor C14 through the first ejector oil path 4011 under the drive of the first drive gas, and the second ejector 4022 supplies oil in the second compressor C24 to the first compressor C14 through the second ejector oil path 4012 under the drive of the second drive gas. As an example, both the first eductor 4021 and the second eductor 4022 may be venturis.
In one example, a first injection control valve 4101 is provided in the first gas supply line 4031 to control the supply of the first driving gas to the first injector 4021 to be opened and closed; the second air supply line 4032 is provided with a second ejector control valve 4102 for controlling the opening and closing of the supply of a second drive gas to the second ejector 4022, the first drive gas being a gas discharged from the second compressor C24, and the second drive gas being a gas discharged from the first compressor C14.
Specifically, as shown in fig. 4, the first pilot oil path 4011 is sequentially formed by a first branch B1, a common line B12 and a second branch B2 along the flow direction of oil, the second pilot oil path 4012 is sequentially formed by a third branch B3, a common line B12 and a fourth branch B4 along the flow direction of oil, a first end of the first branch B1 is connected to an oil port of the second compressor C24, a second end of the first branch B1 and a first end of the fourth branch B4 are connected to a first node 4001 of the common line B12, a first end of the second branch B2 and a second end of the third branch B3 are connected to a second node 4002 of the common line B12, a second end of the second branch B2 is connected to an air suction inlet 4071 of the first compressor C14, a first end of the third branch B3 is connected to an oil port of the first compressor C14, a second end of the fourth branch B2 is connected to an air suction inlet 4071 of the second compressor C14, and a one-way air suction valve 4672 and a one-way inlet 4121 are sequentially connected to the first compressor C40221, a second branch control valve 4041 for controlling the opening and closing of the second branch B2 is provided in the second branch B2, a second ejector 4022 and a second check valve 4122 are sequentially provided in the third branch B3 in the flow direction of the oil, and a fourth branch control valve 4042 for controlling the opening and closing of the fourth branch B4 is provided in the fourth branch B4.
Since the first compressor C14 and the second compressor C24 are located in two different module groups, the first pilot oil passage 4011 and the second pilot oil passage 4012 need to include a coupling portion between the two module groups. For convenience of connection, as described above, the common line B12 is provided, and the common line B12 may be implemented by an oil balance pipe or a communicating vessel.
In the first branch B1 described above, the first check valve 4121 allows oil to flow only from the first end (the oil port of the second compressor C24) of the first branch B1 to the second end (the first node 4001) of the first branch B1. And in the third branch B3, the second check valve 4122 allows oil to flow only from the first end (the oil port of the first compressor C14) of the third branch B3 to the second end (the second node 4002) of the third branch B3. Thus, when both the first injection control valve 4101 and the second branch control valve 4041 are opened, the first injector 4021 can supply oil from the second compressor C24 to the first compressor C14. In contrast, when both the second injection control valve 4102 and the fourth branch control valve 4042 are open, the second injector 4022 can supply oil from the first compressor C14 to the second compressor C24. Therefore, in order to prevent a collision between the first pilot oil passage 4011 and the second pilot oil passage 4012, the second branch control valve 4041 and the fourth branch control valve 4042 may be provided: the fourth branch control valve 4042 is turned off with the second branch control valve 4041 open, and the second branch control valve 4041 is turned off with the fourth branch control valve 4042 open.
Similar to the previous embodiments, in the embodiments shown in fig. 3 and 4, the oil ports connecting the first compressors C13 and C14 with the first pilot oil passages 3011 and 4011 and the oil ports connecting the second compressors C23 and C24 with the second pilot oil passages 3012 and 4012 may be respectively located at the standard oil level of the first compressors C13 and C14 and the standard oil level of the second compressors C23 and C24, so as to avoid excessive oil extraction from the compressors.
In addition, in the case where the compressors are respectively located in different modular units, as shown by branches in a dotted line frame in fig. 4, an oil return branch connected between the discharge outlet and the suction inlet of the compressor may be optionally further included, which in turn includes oil-gas separation elements (oil) 4611, 4621, oil return branch control valves 4612, 4622, and capillaries 4613, 4623 in the direction of oil flow. The gas discharged from the first compressor C14 or the second compressor C24 is supplied to the second gas supply line 4032 or the first gas supply line 4031 as the driving gas after passing through the oil-gas separation elements 4611, 4621. The oil return branch can filter oil mixed in gas discharged from the compressor on one hand to prevent the oil from generating adverse effect along with the gas reaching the drainage control valve, and on the other hand, the oil return branch can feed the filtered oil back to the suction inlet to improve the utilization rate of lubricating oil.
Although in the above described embodiment two compressors are described for clarity, it will be understood by those skilled in the art that the present invention is not limited to two compressors, but may be applied to more compressors, such as 3, 4, 5, 6 or more compressors.
In the above-described specific embodiment of the present invention, the first compressor and the second compressor may be low pressure chamber scroll compressors. The invention is not limited thereto and may be used for oil balancing between other types of compressors.
Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of preferred embodiments of the present invention and should not be construed as limiting the invention.
Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.
Claims (17)
1. An oil balancing device for oil balancing between compressors, the compressors including a first compressor and a second compressor, suction lines of the first compressor and the second compressor being connected in parallel, discharge lines of the first compressor and the second compressor being also connected in parallel, the oil balancing device comprising:
the injection oil way is connected with the first compressor and the second compressor, and an injector is arranged in the injection oil way; and
a gas supply line for supplying a driving gas to the ejector,
the ejector is driven by driving gas to supply oil in an oil-rich compressor of the first compressor and the second compressor to an oil-deficient compressor of the first compressor and the second compressor through the ejector oil way.
2. The oil balancing device of claim 1, wherein the eductor is a venturi.
3. The oil balancing device of claim 1, wherein the gas supply line includes an eductor control valve for controlling the opening and closing of the supply of drive gas to the eductor.
4. The oil balancing device of claim 3, wherein the driving gas is a gas discharged from the first compressor or the second compressor.
5. The oil balancing device of claim 3, further comprising an oil level monitor for monitoring an oil level of the under-oil compressor, wherein the ejector control valve is opened to cause the ejector to supply oil in the rich compressor to the under-oil compressor via the ejector oil passage if the monitored oil level is below a threshold value.
6. The oil balancing device of claim 3, wherein the eductor supplies oil directly to an oil sump in the under oil compressor via an eductor oil passage; or the ejector supplies oil to the suction inlet of the oil-starved compressor through an ejection oil path.
7. The oil balancing device of any one of claims 1 to 6, further comprising an oil balancing pipe that communicates the oil sump in the first compressor and the oil sump in the second compressor such that oil in the oil-rich compressor of the first and second compressors is replenished under gravity to the oil-poor compressor of the first and second compressors via the oil balancing pipe.
8. The oil balancing device of any one of claims 1 to 6, wherein the oil port of the rich oil compressor connected to the injection oil path is located at a standard oil level.
9. An oil balancing device for oil balancing between compressors, the compressors including a first compressor and a second compressor, the oil balancing device comprising:
the first injection oil way and the second injection oil way are used for connecting the first compressor and the second compressor, a first injector is arranged in the first injection oil way, and a second injector is arranged in the second injection oil way; and
a first gas supply line for supplying a first driving gas to the first ejector and a second gas supply line for supplying a second driving gas to the second ejector,
the first ejector supplies oil in the second compressor to the first compressor through the first ejector oil path under the drive of first driving gas, and the second ejector supplies oil in the first compressor to the second compressor through the second ejector oil path under the drive of second driving gas.
10. The oil balancing apparatus of claim 9, wherein the first eductor and the second eductor are each venturis.
11. The oil balancing device of claim 9, wherein the first gas supply line is provided with a first eductor control valve for controlling the supply of the first driving gas to the first eductor; the second air supply pipeline is provided with a second injection control valve for controlling the opening and closing of the supply of second driving air to the second injector, the first driving air is air discharged from any one of the first compressor and the second compressor, and the second driving air is air discharged from any one of the first compressor and the second compressor.
12. The oil balancing device of claim 11, wherein the first eductor supplies oil directly to the oil sump in the first compressor via a first eductor oil passage and the second eductor supplies oil directly to the oil sump in the second compressor via a second eductor oil passage; or,
the first ejector supplies oil to the suction inlet of the first compressor through the first ejector oil path, and the second ejector supplies oil to the suction inlet of the second compressor through the second ejector oil path.
13. The oil balancing device according to any one of claims 9 to 12, wherein the oil supply to the first compressor via the first bleed oil passage and the oil supply to the second compressor via the second bleed oil passage are alternated, and wherein the discharge lines of the first and second compressors are connected in parallel and the suction line is also connected in parallel.
14. The oil balancing device of claim 11, wherein the first pilot oil path is sequentially composed of a first branch, a common line and a second branch along a flow direction of oil, the second pilot oil path is sequentially composed of a third branch, the common line and a fourth branch along the flow direction of oil, a first end of the first branch is connected to an oil port of a second compressor, a second end of the first branch and a first end of the fourth branch and a first end of the common line are connected to a first node, a first end of the second branch and a second end of the third branch and a second end of the common line are connected to a second node, a second end of the second branch is connected to a suction inlet of the first compressor, a first end of the third branch is connected to the oil port of the first compressor, and a second end of the fourth branch is connected to a suction inlet of the second compressor, the oil-water separator is characterized in that a first ejector and a first one-way valve are sequentially arranged in the first branch along the flowing direction of oil, a second branch control valve for controlling the on-off of the second branch is arranged in the second branch, a second ejector and a second one-way valve are sequentially arranged in the third branch along the flowing direction of the oil, a fourth branch control valve for controlling the on-off of the fourth branch is arranged in the fourth branch, the first one-way valve only allows the oil to flow from the first end of the first branch to the second end of the first branch, and the second one-way valve only allows the oil to flow from the first end of the third branch to the second end of the third branch.
15. The oil balancing device of claim 14, wherein the second and fourth branch control valves are arranged to: the fourth branch control valve is turned off when the second branch control valve is opened, and the second branch control valve is turned off when the fourth branch control valve is opened.
16. The oil balancing device of claim 15, further comprising an oil return branch connected between the discharge outlet and the suction inlet of the first compressor and/or between the discharge outlet and the suction inlet of the second compressor, the oil return branch including an oil-gas separation element, an oil return branch control valve, and a capillary tube in order in a direction of oil flow, gas discharged by the first compressor and/or the second compressor being supplied as the first and/or second driving gas to the second air supply line and/or the first air supply line after passing through the oil-gas separation element.
17. The oil balancing device of any one of claims 9 to 12 and 14 to 16, wherein the oil port of the first compressor connected to the second pilot oil passage and the oil port of the second compressor connected to the first pilot oil passage are located at a standard oil level of the first compressor and at a standard oil level of the second compressor, respectively.
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| CN201210102445.1A CN103363724B (en) | 2012-04-10 | 2012-04-10 | For the oil balancing unit of compressor chamber oil balance |
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| CN201210102445.1A CN103363724B (en) | 2012-04-10 | 2012-04-10 | For the oil balancing unit of compressor chamber oil balance |
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