CN108131295B - Oil return control method and circulating system - Google Patents
Oil return control method and circulating system Download PDFInfo
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- CN108131295B CN108131295B CN201711392021.2A CN201711392021A CN108131295B CN 108131295 B CN108131295 B CN 108131295B CN 201711392021 A CN201711392021 A CN 201711392021A CN 108131295 B CN108131295 B CN 108131295B
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- oil
- frequency
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- working frequency
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/021—Control systems for the circulation of the lubricant
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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
- F25B31/004—Lubrication oil recirculating arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses an oil return control method and a circulating system, relates to the field of compressors, and aims to ensure the performance of a variable frequency compressor. The oil return control method comprises the following steps: acquiring the working frequency of a variable frequency compressor in a circulating system; and controlling the oil liquid circulation in an oil return pipeline for returning oil to the variable-frequency compressor by adopting the working frequency according to the relation between the preset working frequency and the oil liquid circulation. According to the technical scheme, the oil circulation in the oil return pipeline for returning oil to the variable frequency compressor is actively adjusted according to the working frequency of the compressor, so that the overall performance of the compressor cannot be reduced due to too much or too little lubricating oil in the compressor.
Description
Technical Field
The invention relates to the field of compressors, in particular to an oil return control method and a circulating system.
Background
At present, the oil return amount of a fixed-frequency screw compressor is a fixed value, and the oil return amount of the variable-frequency screw compressor is also a fixed value at present.
The inventor finds that at least the following problems exist in the prior art: in the operation process of the variable frequency screw compressor, the operation frequency of the compressor is adjusted according to different working conditions, but the oil return amount is a fixed value, so that the overall performance of the compressor is not favorably exerted.
Disclosure of Invention
The invention provides an oil return control method and a circulating system, which are used for enabling oil liquid in a variable frequency compressor to be always in a relatively proper amount so as to ensure the performance of the variable frequency compressor.
The invention provides an oil return control method, which comprises the following steps:
acquiring the working frequency of a variable frequency compressor in a circulating system;
and controlling the oil liquid circulation in an oil return pipeline for returning oil to the variable frequency compressor by adopting the working frequency according to the relation between the preset working frequency and the oil liquid circulation.
In one or some embodiments, the preset working frequency and the oil liquid flow rate relation satisfy the following conditions: the operating frequency is inversely related to the oil flow rate.
In one or some embodiments, the step of controlling the oil flow rate in the oil return line returning oil to the inverter compressor according to the working frequency comprises: and controlling the opening of a control valve in the oil return pipeline to adjust the oil liquid circulation in the oil return pipeline.
In one or some embodiments, when the operating frequency is less than a first preset frequency and when the operating frequency is greater than a second preset frequency, the trend of the decrease of the oil flow rate with the increase of the operating frequency is gentler than that with the increase of the operating frequency between the first preset frequency and the second preset frequency.
In one or some embodiments, the control valve comprises a solenoid valve.
In one or some embodiments, the inverter compressor comprises an inverter screw compressor.
In one or some embodiments, the step of controlling the oil flow rate in the oil return line returning oil to the inverter compressor according to the working frequency comprises:
presetting an oil liquid circulation curve corresponding to each working frequency of the variable frequency compressor according to experimental data;
obtaining the preset oil liquid circulation of the variable frequency compressor at the working frequency according to the oil liquid circulation curve and the obtained working frequency;
and controlling the oil liquid circulation in an oil return pipeline of the oil returned by the variable frequency compressor, so that the oil liquid circulation of the variable frequency compressor is equal to the preset oil liquid circulation.
Another embodiment of the present invention provides a circulation system, including a variable frequency compressor, a controller, a circulation adjusting component and an oil return line, wherein the circulation adjusting component is disposed in the oil return line, the controller is connected to the circulation adjusting component, and the controller is configured to control an oil flow rate in the oil return line through the circulation adjusting component according to a preset relationship between a working frequency and the oil flow rate by using the working frequency of the variable frequency compressor.
In one or some embodiments, the circulation system comprises an air conditioning circulation system.
In one or some embodiments, the flow regulating component comprises a control valve electrically connected to the controller.
In one or some embodiments, the inverter compressor comprises an inverter screw compressor.
According to the technical scheme, the oil liquid circulation quantity in the oil return pipeline for returning oil to the variable frequency compressor is actively adjusted according to the working frequency of the compressor, so that the overall performance of the compressor cannot be reduced due to too much or too little lubricating oil in the compressor. When the system returns oil, the oil circulation under different frequencies is controlled to ensure sufficient lubrication, and meanwhile, the oil circulation is not too large, so that the power consumption is not increased, and the volume efficiency can be ensured to be in a better state.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic flow chart of an oil return control method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a preset oil return curve according to an embodiment of the present invention;
fig. 3 is a schematic partial schematic view of a circulation system according to an embodiment of the present invention.
Detailed Description
The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 3.
Referring to fig. 1, an embodiment of the present invention provides an oil return control method, including the following steps:
and step S10, acquiring the working frequency of the variable frequency compressor in the circulating system.
And step S20, controlling the oil liquid circulation in the oil return pipeline returning oil to the variable frequency compressor by adopting the working frequency according to the relation between the preset working frequency and the oil liquid circulation. Specifically, the relationship between the preset working frequency and the oil liquid circulation satisfies the following conditions: the operating frequency is inversely related to the oil flow rate. Namely, the higher the working frequency is, the smaller the oil flow is, and the less the oil returns to the compressor; the lower the working frequency, the larger the oil flow, and the larger the oil amount returned to the compressor.
In the above step S20, the oil flow rate is actively controlled according to the working frequency of the inverter compressor 1 to ensure that the amount of the inverter compressor 1 is appropriate, and the inverter compressor 1 can be lubricated and ensure that the volumetric efficiency is in a better state.
Referring to fig. 3, in the above step S20, the oil flow rate may be controlled using the control valve 2, specifically: the opening of the control valve 2 in the oil return pipeline is controlled to adjust the oil liquid circulation in the oil return pipeline.
In the present example, see fig. 2, where the operating frequency is inversely related to the oil flow, the following adjustments are satisfied: when the working frequency is less than the first preset frequency a and is greater than the second preset frequency b, the trend of the decrease of the oil liquid circulation along with the increase of the working frequency is gentler than the trend of the decrease of the oil liquid circulation along with the increase of the working frequency when the working frequency is between the first preset frequency a and the second preset frequency b.
The working frequency is less than the first preset frequency a, and when the working frequency is greater than the second preset frequency b, the oil liquid circulation and the working frequency are in an approximately inverse relation.
The step S20 may specifically include the following steps:
firstly, presetting an oil liquid circulation curve corresponding to each working frequency of the variable frequency compressor according to experimental data. This step may not be in the order of step S10 described above. In this embodiment, step S10 is taken as an example. It is understood that the oil flow rate curve may also be obtained first.
And secondly, obtaining the preset oil liquid circulation of the variable frequency compressor under the working frequency according to the oil liquid circulation curve and the obtained working frequency. According to the oil liquid circulation curve and the actual working frequency of the variable frequency compressor, the preset oil liquid circulation under the working frequency can be searched and obtained.
And thirdly, controlling the oil liquid circulation in an oil return pipeline of the oil returned by the variable frequency compressor, so that the oil liquid circulation of the variable frequency compressor is equal to the preset oil liquid circulation.
Referring to fig. 2, an optimal oil flow characteristic curve of the inverter compressor 1 is preset, when the compressor operates at a low frequency, a large oil flow is required to ensure the performance of the compressor, and as the compressor operates at an increased frequency, the oil flow required by the compressor in a high-speed operation is gradually reduced. When the working frequency is higher than the second preset frequency b, the curve tends to be gentle and gradually parallel to the X axis, and the distance between the curve and the horizontal axis of the coordinate axis tends to be constant.
In order to achieve an automatic control of the oil flow of the inverter compressor 1, in particular, the control valve 2 comprises a solenoid valve.
In this embodiment, the inverter compressor 1 includes an inverter screw compressor.
The above-described circulation system having the inverter compressor 1 includes a circulation system of an air conditioner.
According to the technical scheme, the characteristic curve of the optimal oil liquid circulation of the compressor under different frequencies is preset, the oil liquid circulation is automatically controlled through the electromagnetic valve, the performance of the compressor is improved, the power consumption of the variable frequency compressor 1 is reduced, and the gas transmission capacity of the compressor is improved.
Referring to fig. 2 and fig. 3, another embodiment of the present invention provides a circulation system, which can implement the oil return control method provided in any of the above technical solutions. The circulating system comprises a variable frequency compressor 1, a controller, a flow regulating component and an oil return pipeline. The circulation regulating component is arranged in the oil return pipeline, the controller is connected with the circulation regulating component and is used for controlling the oil liquid circulation in the oil return pipeline by adopting the working frequency of the variable frequency compressor 1 according to the preset relation between the working frequency and the oil liquid circulation.
Specifically, the relationship between the preset working frequency and the oil liquid circulation satisfies the following conditions: the operating frequency is inversely related to the oil throughput. Namely, the higher the working frequency is, the smaller the oil liquid circulation is, and the less the oil liquid circulation is; the lower the working frequency, the greater the oil flow, and the greater the oil flow.
The flow regulating component can adopt various structures, for example, the combination of various pipe fittings is adopted, and when the required flow is large, more pipes are connected into the flow path; otherwise, the number is small. Referring to fig. 3, in the present embodiment, the flow rate adjustment component includes a control valve 2, and the control valve 2 may be specifically a solenoid valve, and the solenoid valve is electrically connected to the controller.
Above-mentioned technical scheme can guarantee the best fluid circulation all the time because of inverter compressor 1 moves under different frequency, so can guarantee abundant lubrication, can guarantee best volumetric efficiency again.
In order to obtain the optimal performance of the compressor under any frequency, namely the improvement of the gas transmission quantity of the compressor and the reduction of the power, the oil liquid circulation quantity of the down-conversion compressor 1 under different frequencies needs to be determined, the scheme obtains the characteristic curve of the optimal oil liquid circulation quantity under different frequencies, and controls the oil liquid circulation quantity through the control valve 2 in a mode of arranging an oil storage device 3, so as to ensure the performance of the compressor. When applied to a sub-air conditioning system, the oil reservoir 3 may be an oil separator of the system.
According to the technical scheme, the control valve 2 is installed in a pipeline between the variable frequency compressor 1 and the oil reservoir 3, and an automatic control program of the control valve 2 is set according to oil liquid circulation characteristic curves under different preset frequencies. When the inverter compressor 1 does not operate under the optimal working condition, the control valve 2 can automatically adjust the oil flow according to the operating frequency of the inverter compressor 1, so that the internal oil quantity of the inverter compressor 1 is ensured, and the optimal performance is obtained.
In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. An oil return control method is characterized by comprising the following steps:
acquiring the working frequency of a variable frequency compressor in a circulating system; wherein the operating frequency is greater than 0;
controlling oil liquid circulation in an oil return pipeline for returning oil to the variable frequency compressor by adopting the working frequency according to a preset relation between the working frequency and the oil liquid circulation;
wherein, the preset relation between the working frequency and the oil liquid circulation satisfies the following requirements: the operating frequency is inversely related to the oil flow rate; when the working frequency is smaller than a first preset frequency and when the working frequency is larger than a second preset frequency, the trend of the decrease of the oil liquid circulation along with the increase of the working frequency is gentler than the trend of the decrease of the oil liquid circulation along with the increase of the working frequency when the working frequency is between the first preset frequency and the second preset frequency.
2. The oil return control method of claim 1, wherein the step of controlling oil flow through an oil return line returning oil to the inverter compressor using the operating frequency comprises: and controlling the opening of a control valve in the oil return pipeline to adjust the oil liquid circulation in the oil return pipeline.
3. The oil return control method of claim 2, wherein the control valve comprises a solenoid valve.
4. The oil return control method of claim 1, wherein the inverter compressor comprises an inverter screw compressor.
5. The oil return control method of claim 1, wherein the step of controlling oil flow through an oil return line returning oil to the inverter compressor using the operating frequency comprises:
presetting an oil liquid circulation curve corresponding to each working frequency of the variable frequency compressor according to experimental data;
obtaining the preset oil liquid circulation of the variable frequency compressor at the working frequency according to the oil liquid circulation curve and the obtained working frequency;
and controlling the oil liquid circulation in an oil return pipeline of the oil returned by the variable frequency compressor, so that the oil liquid circulation of the variable frequency compressor is equal to the preset oil liquid circulation.
6. A circulating system is characterized by comprising a variable frequency compressor (1), a controller, a circulation regulating component and an oil return pipeline, wherein the circulation regulating component is arranged in the oil return pipeline and connected with the circulation regulating component, and the controller is used for controlling the oil circulation in the oil return pipeline through the circulation regulating component according to the relation between the preset working frequency and the oil circulation and by adopting the working frequency of the variable frequency compressor (1); wherein, the relation of preset operating frequency and fluid circulation satisfies: the operating frequency is inversely related to the oil flow rate; when the working frequency is less than a first preset frequency and when the working frequency is greater than a second preset frequency, the trend of the decrease of the oil liquid circulation along with the increase of the working frequency is smoother than the trend of the decrease of the oil liquid circulation along with the increase of the working frequency when the working frequency is between the first preset frequency and the second preset frequency; wherein the operating frequency is greater than 0.
7. The circulation system of claim 6, wherein the circulation system comprises an air conditioning circulation system.
8. A circulation system according to claim 6, characterized in that the flow regulating means comprises a control valve (2), the control valve (2) being electrically connected with the controller.
9. A circulation system according to claim 6, characterized in that the inverter compressor (1) comprises an inverter screw compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711392021.2A CN108131295B (en) | 2017-12-21 | 2017-12-21 | Oil return control method and circulating system |
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| CN201711392021.2A CN108131295B (en) | 2017-12-21 | 2017-12-21 | Oil return control method and circulating system |
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| CN108131295A CN108131295A (en) | 2018-06-08 |
| CN108131295B true CN108131295B (en) | 2021-06-04 |
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| DE102019125070B4 (en) * | 2019-09-18 | 2022-10-06 | Ford Global Technologies, Llc | Method for controlling a refrigeration circuit, refrigeration circuit, thermal management system and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0282057A (en) * | 1988-09-19 | 1990-03-22 | Matsushita Refrig Co Ltd | Heat pump type air conditioner |
| JP5223873B2 (en) * | 2010-01-25 | 2013-06-26 | ダイキン工業株式会社 | Air conditioner |
| CN102650485B (en) * | 2012-04-18 | 2015-04-22 | Tcl空调器(中山)有限公司 | Frequency-conversion multi-online system and control method of lubricating oil of compressor thereof |
| CN107339836B (en) * | 2017-06-13 | 2019-09-24 | 珠海格力电器股份有限公司 | Frequency converter sets and its method for controlling oil return, device |
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