CN107288886B - Oil level control method for low-pressure cavity compressor system - Google Patents
Oil level control method for low-pressure cavity compressor system Download PDFInfo
- Publication number
- CN107288886B CN107288886B CN201710457386.2A CN201710457386A CN107288886B CN 107288886 B CN107288886 B CN 107288886B CN 201710457386 A CN201710457386 A CN 201710457386A CN 107288886 B CN107288886 B CN 107288886B
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- Prior art keywords
- oil
- temperature sensor
- low
- oil level
- compressor
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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
-
- 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
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
-
- 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
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/19—Temperature
Abstract
The application provides an oil level control method of a low-pressure cavity compressor system, wherein the low-pressure cavity compressor system comprises a low-pressure cavity compressor and a connecting pipeline thereof, a first temperature sensor, a second temperature sensor and an execution module electrically connected with the first temperature sensor and the second temperature sensor, an expansion valve is connected to the connecting pipeline of the low-pressure cavity compressor, and the first temperature sensor is arranged at the bottom of the low-pressure cavity compressor or the bottom of an oil groove; the second temperature sensor is arranged at the warning position of the oil level of the low-pressure cavity compressor; the judging unit of the execution module judges whether the system oil level is normal according to the oil temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor; and the execution unit of the execution module controls whether the system starts an oil return measure or not according to the judgment result of the judgment unit. The oil level control method can accurately judge the real condition of the oil level and avoid the problem of repeated oil return in the oil shortage process of the conventional system.
Description
Technical Field
The application belongs to the technical field of low-pressure cavity compressor systems, and particularly relates to an oil level control method of a low-pressure cavity compressor system.
Background
In the operation process of a refrigeration air-conditioning system, due to severe system load change, improper control, starting process or system defrosting action and the like, excessive refrigerant returns to a compressor, lubricating oil of the compressor is diluted, the viscosity of the lubricating oil is reduced, and poor lubrication of running parts of the compressor is caused, so that the compressor fails.
The existing low-pressure cavity oil groove compressor is not provided with corresponding oil level protection measures and oil viscosity protection schemes, and in product application, the problems that whether a large amount of liquid is carried by a unit or not and whether oil leakage exists or not are usually judged through a large amount of experimental verification. When the oil viscosity is insufficient due to the liquid carrying of the unit, the compressor is easy to wear and even has a liquid impact phenomenon after long-term operation; and the unit operates under the working condition of oil loss, so that the abrasion of the compressor is accelerated, and the use safety of the whole system is influenced.
Disclosure of Invention
In view of the above, the present application provides an oil level control method for a low pressure chamber compressor system.
According to a first aspect of the present application, there is provided an oil level control method for a low pressure chamber compressor system, the low pressure chamber compressor system includes a low pressure chamber compressor and a connecting pipeline thereof, a first temperature sensor, a second temperature sensor, and an execution module electrically connected to the first temperature sensor and the second temperature sensor, an expansion valve is connected to the connecting pipeline of the low pressure chamber compressor, and the first temperature sensor is disposed at the bottom of the low pressure chamber compressor or at the bottom of an oil sump; the second temperature sensor is arranged at a warning position of the oil level of the low-pressure cavity compressor; the oil level control method includes the steps of:
setting a suction superheat threshold value, and adjusting the opening degree of an expansion valve according to the superheat degree;
the first temperature sensor detects the oil temperature T
1；
The second temperature sensor detects the oil temperature or the suction temperature T
2；
The judging unit of the execution module detects the oil temperature T according to the first temperature sensor
1Temperature T detected by the second temperature sensor
2Judging whether the oil level of the system is normal or not;
the execution unit of the execution module controls whether the system starts oil return measures according to the judgment result of the judgment unit, wherein the oil return measures starting measures specifically comprise the following steps:
when T is
1=T
2Judging that the oil level of the system is normal, and not starting an oil return measure;
when T is
1＞T
2And lasts for t
1If the time is long, the oil level of the system is judged to be too low, and an oil return measure is started;
starting oil return measures continuously t
2Duration, detect T again
1=T
2Then, the oil return operation t is continued
2Ending oil return after 2 time periods; wherein the maximum rated deviation value of the first temperature sensor is delta t
1(ii) a The maximum rated deviation value of the second temperature sensor is delta t
2(ii) a Presetting a current | T in the system
1-T
2|≤Δt
1+Δt
2Considered as said T
1=T
2。
Further, the t is
1The preset time is 120 s.
Further, when the oil return measures are started for t
3After a long time, the detection still can not reach T
1=T
2When it is time, the machine is shut down for protection, t
3＞t
2(ii) a Said t is
3The preset time is 300 s.
The technical scheme provided by the embodiment of the application can have the following beneficial effects: this application sets up first temperature sensor through setting up on the bottom of low-pressure chamber compressor bottom or oil groove, sets up second temperature sensor on the alert position of low-pressure chamber compressor oil level, utilizes the oil temperature that first temperature sensor detected and the comparison of the oil temperature or the temperature of breathing in that second temperature sensor detected, judges whether the oil level is normal to whether according to judgement result control system starts the oil return measure in order to guarantee the oil level, make the system move under good operating mode.
Drawings
Fig. 1 is a schematic diagram of a low pressure chamber compressor system according to an exemplary embodiment of the present application.
Fig. 2 is a schematic view of a low pressure chamber compressor according to an exemplary embodiment of the present application.
Fig. 3 is a schematic diagram of an oil level control method according to an exemplary embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
FIG. 1 is a schematic diagram of a low pressure chamber compressor system according to an exemplary embodiment of the present application; FIG. 2 is a schematic diagram of a low pressure chamber compressor configuration shown in an exemplary embodiment of the present application; fig. 3 is a schematic diagram of an oil level control method according to an exemplary embodiment of the present application.
Referring to fig. 1 to 3, a low pressure chamber compressor system according to the present invention includes a low pressure chamber compressor 1, an execution module (not shown), and an expansion valve 4 and a four-way valve 5 connected to a compressor pipeline. The compressor 1 is provided with a first temperature sensor 2 and a second temperature sensor 3.
Specifically, in an embodiment, the first temperature sensor 2 is disposed at the bottom of the low pressure chamber compressor 1 or at the bottom of the oil tank, and is used for detecting the oil temperature T
1。
A second temperature sensor 3, arranged at a warning position of the oil level of the low-pressure chamber compressor 1, i.e. on a safety oil level line required by the compressor, for detecting the oil temperature T
2Or suction temperature T
2(ii) a When the oil level is above the safety line, the temperature T detected by the second temperature sensor 3 is now
2Is the oil temperature; when the oil level is below the safety line, the temperature T detected by the second temperature sensor 3 at this time
2Is the temperature of the suction gas.
The execution module is electrically connected with the first temperature sensor 2 and the second temperature sensor 3 and is used for judging the oil level according to the temperature parameters detected by the first temperature sensor 2 and the second temperature sensor 3 and controlling whether a system starts oil return measures or not.
The execution module comprises a judgment unit and an execution unit, wherein the judgment unit receives the first temperature
Temperature data detected by the sensor 2 and the second temperature sensor 3; and according to the oil temperature T detected by the first temperature sensor 2
1And the above-mentionedTemperature T detected by the second temperature sensor 3
2And (4) judging whether the oil level of the system is normal or not.
In the embodiment of the present application, the first temperature sensor 2 and the second temperature sensor 3 both have a deviation value Δ t during the actual temperature detection process, and the maximum rated deviation value of the first temperature sensor
Is Δ t
1(ii) a The maximum rated deviation value of the second temperature sensor is delta t
2. Presetting in the system
|T
1-T
2|≤Δt
1+Δt
2Are all regarded as the T
1=T
2. E.g. at
1And Δ t
2All at +/-1 ℃; when detecting the temperature T
1And T
2Satisfy | T
1- T
2When | < 2 ℃, according to the T
1= T
2. Admittedly, the said Δ t
1And Δ t
2Different value ranges can be selected according to different system designs; the embodiment of the present application does not limit the selection of the value.
The execution unit is electrically connected with the judgment unit and is used for controlling whether the system starts oil return measures or not according to the judgment result of the judgment unit.
When T is
1=T
2Judging that the oil level of the system is normal, and not starting an oil return measure;
when T is
1＞T
2And lasts for t
1And (4) time length, judging that the oil level of the system is below the safe oil level, and starting an oil return measure. Oil return starting measure t
2After a long time, T is detected again
1=T
2Then, the oil return operation is continued for 2 t
2And ending the oil return in the time length.
When oil return measures t are started
3After a long time, the detection still can not reach T
1=T
2And when the system is in use, the system is shut down for protection.
In the present embodiment, t is
1Preset to 120s, t
3Presetting to 300 s; of course t
1、t
3The preset time is set according to the different operation safety of the units, and the method is not particularly limited in this application.
In the use of compressor system, lubricating oil is gone up by the eccentric pump suction in the oil groove of low pressure chamber, supply with rotating part, bearing etc. for it is lubricated, also take away partly friction heat simultaneously, most lubricating oil can fall along with gravity, contact the motor again, further by overheated, fall into the bottom oil groove at last, under the operating mode of rated refrigeration, the oil temperature is about 15~30 ℃ higher than the temperature of breathing in, under the condition of big pressure ratio, this difference is big, under the condition of low pressure ratio, this difference is little, can reach about 5 ℃.
Under the condition that the superheat degree is not stably controlled, the suction air carries liquid, the superheat degree of the oil temperature is close to 0 ℃, and the warning is inconvenient at the moment. In order to avoid the influence of the occurrence of the situation on correct judgment, the method for controlling the superheat degree to be stable specifically comprises the following steps: setting a suction superheat threshold value, and adjusting the opening degree of the electronic expansion valve according to the superheat degree. If the suction superheat degree is larger than the target suction superheat degree, opening a large expansion valve; if the suction superheat is less than the target suction superheat, the expansion valve is closed. When the superheat degree is controlled stably, the air is sucked and the liquid is carried, T
1Is close to T
2The warning effect is not available, and actually, the air suction is carried with liquid, so that the oil level is higher, and the system operation environment is relatively better.
In this embodiment, the expansion valve may be an electronic expansion valve or a thermal expansion valve.
In this embodiment, the oil loss phenomenon occurs when the compressor operates at a low speed, because the flow rate is low, the oil carrying capacity of the air flow is reduced, and the lubricating oil cannot return to the compressor; through T
1And T
2Whether oil is lost or not is judged according to the temperature relationship, and when the oil is judged to be lost, oil return is ensured by increasing the rotating speed of the compressor. The end conditions of oil return are as follows: t is
1=T
2And from start-up oil return sequence to T
1=T
2Time of t
2Then continue to run 2 x t
2And ending oil return after the time. Namely, after the oil level reaches a safe position, the system continues to run for double time to ensure sufficient oil return, and frequent oil return of the system, particularly the multi-split system, is avoided.
Of course, the execution module may also record the unit operating condition corresponding to the oil level change, specifically including the rotation speed of the compressor, the ambient temperature, the indoor temperature, the operation mode, the state of the fan, and the like. In this embodiment, the unit adopts an improvement scheme when experiencing the same conditions next time by learning the low oil level occurrence conditions. The improvement scheme is specifically as follows: 1. when the suction gas and the liquid are detected or judged, reducing the rotating speed of the compressor or reducing the opening degree of the expansion valve; 2. if the system is in the occasion of defrosting switching, the four-way valve is powered off or on in advance, and liquid in the compressor is prevented from being carried due to unreasonable switching time of the four-way valve.
In this embodiment, the unit learns that data records are formed after the low oil level occurrence condition, and the current working condition and the working condition corresponding to the alarm are compared in the unit operation process, and if the current working condition and the working condition are close to each other, a corresponding improvement scheme is given: and increasing the rotating speed of the compressor, wherein the specific increasing value is 10% of the corresponding rotating speed of the compressor under the real-time working condition.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (5)
1. An oil level control method of a low-pressure chamber compressor system is characterized in that the low-pressure chamber compressor system is provided with an oil level control device
The system comprises a low-pressure cavity compressor and a connecting pipeline thereof, a first temperature sensor, a second temperature sensor and an execution module electrically connected with the first temperature sensor and the second temperature sensor, wherein the connecting pipeline of the low-pressure cavity compressor is connected with an expansion valve, and the first temperature sensor is arranged at the bottom of the low-pressure cavity compressor or the bottom of an oil groove; the second temperature sensor is arranged at a warning position of the oil level of the low-pressure cavity compressor; the oil level control method includes the steps of:
setting a suction superheat threshold value, and adjusting the opening degree of an expansion valve according to the superheat degree;
the first temperature sensor detects the oil temperature T
1；
The second temperature sensor detects the oil temperature or the suction temperature T
2；
The judging unit of the execution module detects the oil temperature T according to the first temperature sensor
1Temperature T detected by the second temperature sensor
2Judging whether the oil level of the system is normal or not;
the execution unit of the execution module controls whether the system starts oil return measures according to the judgment result of the judgment unit, wherein the oil return measures starting measures specifically comprise the following steps:
when T is
1=T
2Judging that the oil level of the system is normal, and not starting an oil return measure;
when T is
1＞T
2And lasts for t
1If the time is long, the oil level of the system is judged to be too low, and an oil return measure is started;
starting oil return measures continuously t
2Duration, detect T again
1=T
2Then, the oil return operation t is continued
2Ending oil return after 2 time periods; wherein the maximum rated deviation value of the first temperature sensor is delta t 1; the maximum rated deviation value of the second temperature sensor is delta t
2(ii) a Presetting a current | T in the system
1-T
2|≤Δt
1+Δt
2Considered as said T
1=T
2。
2. The oil level control method of a low pressure chamber compressor system of claim 1, wherein t is the value of
1The preset time is 120 s.
3. The oil level control method of a low pressure chamber compressor system of claim 1, wherein the oil level control method further comprises a step of controlling a pressure of the oil in the low pressure chamber compressor system
When the oil return measures are started for a period of time t
3After a long time, the detection still can not reach T
1=T
2When it is time, the machine is shut down for protection, t
3＞t
2(ii) a Said t is
3The preset time is 300 s.
4. The oil level control method of the low pressure chamber compressor system as claimed in claim 1, wherein the oil return starting measure is specifically to increase the rotation speed of the compressor.
5. The oil level control method according to claim 1, wherein if the suction superheat is greater than the target suction superheat, the expansion valve is opened large; if the suction superheat is less than the target suction superheat, the expansion valve is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710457386.2A CN107288886B (en) | 2017-06-16 | 2017-06-16 | Oil level control method for low-pressure cavity compressor system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710457386.2A CN107288886B (en) | 2017-06-16 | 2017-06-16 | Oil level control method for low-pressure cavity compressor system |
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| Publication Number | Publication Date |
|---|---|
| CN107288886A CN107288886A (en) | 2017-10-24 |
| CN107288886B true CN107288886B (en) | 2020-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710457386.2A Active CN107288886B (en) | 2017-06-16 | 2017-06-16 | Oil level control method for low-pressure cavity compressor system |
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| CN109000388A (en) * | 2018-06-15 | 2018-12-14 | 重庆美的通用制冷设备有限公司 | Water cooler and its oil pump control method, device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003097443A (en) * | 2001-09-25 | 2003-04-03 | Mitsubishi Heavy Ind Ltd | Compressor and refrigeration unit |
| CN1696506A (en) * | 2004-05-13 | 2005-11-16 | 松下电器产业株式会社 | Hermetic compressor and refrigeration unit |
| JP2009250223A (en) * | 2008-04-11 | 2009-10-29 | Panasonic Corp | Hermetic compressor and refrigerating unit |
| CN205876661U (en) * | 2016-07-21 | 2017-01-11 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor and air conditioner |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080065191A (en) * | 2007-01-08 | 2008-07-11 | 주식회사 대우일렉트로닉스 | Apparatus and method for recovering oil of compressor |
-
2017
- 2017-06-16 CN CN201710457386.2A patent/CN107288886B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003097443A (en) * | 2001-09-25 | 2003-04-03 | Mitsubishi Heavy Ind Ltd | Compressor and refrigeration unit |
| CN1696506A (en) * | 2004-05-13 | 2005-11-16 | 松下电器产业株式会社 | Hermetic compressor and refrigeration unit |
| JP2009250223A (en) * | 2008-04-11 | 2009-10-29 | Panasonic Corp | Hermetic compressor and refrigerating unit |
| CN205876661U (en) * | 2016-07-21 | 2017-01-11 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor and air conditioner |
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| CN107288886A (en) | 2017-10-24 |
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