CN111102695B - Refrigerant pump control method and device and air conditioning unit - Google Patents
Refrigerant pump control method and device and air conditioning unit Download PDFInfo
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- CN111102695B CN111102695B CN201911313055.7A CN201911313055A CN111102695B CN 111102695 B CN111102695 B CN 111102695B CN 201911313055 A CN201911313055 A CN 201911313055A CN 111102695 B CN111102695 B CN 111102695B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F25B2600/00—Control issues
- F25B2600/05—Refrigerant levels
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Abstract
The invention discloses a refrigerant pump control method, a refrigerant pump control device and an air conditioning unit, wherein the method comprises the following steps: detecting the running state of the unit, wherein the running state of the unit at least comprises a running working condition and a running load; determining the optimal liquid supply flow of a refrigerant pump according to the running state of the unit; and controlling the opening degree of the refrigerant pump according to the optimal liquid supply flow. The invention solves the problem that the liquid supply flow of the refrigerant pump in the prior art can not be adjusted according to the running condition of the unit, can provide the optimal refrigerant flow for the compressor, obviously improves the comprehensive energy efficiency of the unit and enhances the running reliability of the unit.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling a refrigerant pump and an air conditioning unit.
Background
The bearing is a key element in the centrifugal compressor, and the bearing is used for bearing the weight of the rotor and the rotation of the rotor during operation. The lubricating agent in the bearing can reduce friction resistance and abrasion, and also has the functions of heat dissipation, temperature reduction, contact stress reduction, vibration absorption, corrosion prevention and the like.
The oil lubricating bearing is low in cost, simple in structure and high in reliability, and therefore is widely applied, but in the running process of a compressor, lubricating oil can be leaked into a refrigerating system to be mixed with a refrigerant, the heat exchange performance of the refrigerant is affected, and therefore an extra device needs to be installed to purify the refrigerant and recover the lubricating oil. Research shows that the liquid refrigerant has certain viscosity, which is one of the most important properties of lubricating oil, so that the refrigerant can replace lubricating oil to lubricate bearings. The refrigerant lubricating bearing belongs to an oilless bearing and has the advantages of low cost, simple structure, high reliability and the like.
However, the existing refrigerant liquid supply method has a serious disadvantage that the liquid supply flow of the refrigerant pump is usually fixed, and the liquid supply flow of the refrigerant pump cannot be timely and effectively adjusted under different operation conditions and different loads of the unit, so that the operation of the bearing is unstable, and the operation of the compressor and even the operation of the whole unit is affected.
Aiming at the problem that the liquid supply flow of a refrigerant pump in the related technology can not be adjusted according to the running condition of a unit, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a refrigerant pump control method and device and an air conditioning unit, and at least solves the problem that the liquid supply flow of a refrigerant pump in the prior art cannot be adjusted according to the unit operation condition.
In order to solve the above technical problem, according to an aspect of an embodiment of the present invention, there is provided a refrigerant pump control method, including: detecting the running state of the unit, wherein the running state of the unit at least comprises a running working condition and a running load; determining the optimal liquid supply flow of a refrigerant pump according to the running state of the unit; and controlling the opening degree of the refrigerant pump according to the optimal liquid supply flow.
Further, determining the optimal liquid supply flow of the refrigerant pump according to the running state of the unit comprises the following steps: determining the pressure ratio of the corresponding compressor according to the operation condition; determining the power of the corresponding unit according to the operation load; and determining the optimal liquid supply flow of the refrigerant pump according to the pressure ratio of the compressor and the power of the unit.
Further, the method for determining the optimal liquid supply flow rate of the refrigerant pump according to the pressure ratio of the compressor and the power of the unit comprises the following steps: calculating a pressure ratio percentage of a pressure ratio of the compressor relative to a reference pressure ratio; calculating the power percentage of the power of the unit relative to the reference power; obtaining a liquid supply flow calculation formula, wherein the calculation formula is used for calculating the optimal liquid supply flow of the refrigerant pump according to the pressure ratio percentage and the power percentage; and determining the optimal liquid supply flow of the refrigerant pump according to the pressure ratio percentage and the power percentage and the liquid supply flow calculation formula.
Further, before determining the optimal liquid supply flow rate of the refrigerant pump according to the operation state of the unit, the method further comprises the following steps: collecting the pressure ratio percentages corresponding to different operating conditions, the power percentages corresponding to different operating loads and the liquid supply flow of a refrigerant pump; and fitting a liquid supply flow calculation formula according to the pressure ratio percentages corresponding to different operating conditions, the power percentages corresponding to different operating loads and the liquid supply flow of the refrigerant pump.
Further, fitting a liquid supply flow calculation formula according to the pressure ratio percentages corresponding to different operating conditions, the power percentages corresponding to different operating loads and the liquid supply flow of the refrigerant pump, wherein the fitting calculation formula comprises the following steps: taking the pressure ratio percentages corresponding to different operating conditions and the power percentages corresponding to different operating loads as dependent variables, and taking the liquid supply flow of the refrigerant pump as a target variable; adjusting the liquid supply flow of the refrigerant pump to optimize the energy efficiency of the compressor, and obtaining the optimal liquid supply flow of the refrigerant pump corresponding to different pressure ratio percentages and different power percentages; and fitting a liquid supply flow calculation formula according to the optimal liquid supply flow of the refrigerant pump corresponding to different pressure ratio percentages and different power percentages.
Further, the liquid supply flow calculation formula is as follows: a is0+a1×X1+a2×X2+a3×X1 2+a4×X1×X2+a5×X2 2Wherein a0, a1, a2, a3, a4 and a5 are all empirical coefficients, X1 is the percentage of pressure ratio, and X2 is the percentage of power.
Further, the method for controlling the opening degree of the refrigerant pump according to the optimal liquid supply flow comprises the following steps: determining the opening degree of a refrigerant pump corresponding to the optimal liquid supply flow according to the optimal liquid supply flow; and the opening degree of the refrigerant pump is sent to a main board of the refrigerant pump so as to control the refrigerant pump to adjust the opening degree of the refrigerant pump according to the preset adjusting step and the preset adjusting period, and the optimal liquid supply flow is achieved.
According to another aspect of the embodiments of the present invention, there is provided a refrigerant pump control device, including: the detection module is used for detecting the running state of the unit, and the running state of the unit at least comprises a running working condition and a running load; the liquid supply flow determining module is used for determining the optimal liquid supply flow of the refrigerant pump according to the running state of the unit; and the opening degree determining module is used for controlling the opening degree of the refrigerant pump according to the optimal liquid supply flow.
According to another aspect of the embodiments of the present invention, an air conditioning unit is provided, which includes the refrigerant pump control device as described above.
According to another aspect of the present invention, there is provided a storage medium containing computer-executable instructions for performing the refrigerant pump control method as described above when executed by a computer processor.
The method comprises the steps of firstly detecting the running state of a detection unit, wherein the running state of the detection unit at least comprises a running working condition and a running load, and then determining the optimal liquid supply flow of a refrigerant pump according to the running state of the detection unit so as to control the opening of the refrigerant pump. The corresponding optimal liquid supply flow is adopted as a control target for different working conditions and different loads, the control method is accurate, stable and reliable, the comprehensive energy efficiency of the unit can be remarkably improved, and the reliability of the unit operation is enhanced.
Drawings
FIG. 1 is an alternative flow diagram of a refrigerant pump control method according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a refrigeration system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a refrigeration system incorporating a refrigerant pump according to an embodiment of the present invention;
FIG. 4 is a flow chart illustrating an alternative method of controlling a refrigerant pump according to an embodiment of the present invention; and
fig. 5 is a block diagram of an alternative configuration of a refrigerant pump control device according to an embodiment of the present invention.
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 invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example 1
In preferred embodiment 1 of the present invention, a refrigerant pump control method is provided, which can be directly applied to various refrigerant pumps, specifically, fig. 1 shows an alternative flow chart of the method, and as shown in fig. 1, the method includes the following steps S102 to S106:
s102: detecting the running state of the unit, wherein the running state of the unit at least comprises a running working condition and a running load;
s104: determining the optimal liquid supply flow of a refrigerant pump according to the running state of the unit;
s106: and controlling the opening degree of the refrigerant pump according to the optimal liquid supply flow.
In the above embodiment, the operation state of the unit is detected, where the operation state of the unit at least includes an operation condition and an operation load, and then the optimum liquid supply flow rate of the refrigerant pump is determined according to the operation state of the unit, so as to control the opening degree of the refrigerant pump. The corresponding optimal liquid supply flow is adopted as a control target for different working conditions and different loads, the control method is accurate, stable and reliable, the comprehensive energy efficiency of the unit can be remarkably improved, and the reliability of the unit operation is enhanced.
For a centrifugal chiller, fig. 2 shows a schematic of a refrigeration system, a typical refrigeration workflow is shown in fig. 2: the high-temperature and high-pressure refrigerant from the exhaust port of the compressor enters the condenser to release heat and condense, flows out of the condenser, passes through the primary throttling device to reduce pressure, enters the flash evaporator, is separated from the liquid refrigerant, enters the air supplementing port of the compressor, flows out of the flash evaporator, passes through the fifth-secondary throttling device to reduce pressure, enters the sixth-evaporator to absorb the heat of the chilled water to evaporate, and enters the compressor from the air outlet at the top of the evaporator to be compressed. In the entire refrigeration cycle, the compressor functions to compress and transport refrigerant vapor and maintain a low pressure in the evaporator and a high pressure in the condenser, and is the heart of the entire system.
Fig. 3 is a schematic diagram of a refrigeration system equipped with a refrigerant pump, as shown in fig. 2, in order to provide liquid refrigerant for a refrigerant lubrication bearing, a connecting pipe is installed between a compressor and a condenser, and the liquid refrigerant in the condenser is introduced into a compressor cavity to supply liquid to the bearing.
In a preferred embodiment of the present invention, determining an optimal liquid supply flow rate of the refrigerant pump according to an operation state of the unit includes: determining the pressure ratio of the corresponding compressor according to the operation condition; determining the power of the corresponding unit according to the operation load; and determining the optimal liquid supply flow of the refrigerant pump according to the pressure ratio of the compressor and the power of the unit.
The method for determining the optimal liquid supply flow of the refrigerant pump according to the pressure ratio of the compressor and the power of the unit comprises the following steps: calculating a pressure ratio percentage of a pressure ratio of the compressor relative to a reference pressure ratio; calculating the power percentage of the power of the unit relative to the reference power; obtaining a liquid supply flow calculation formula, wherein the calculation formula is used for calculating the optimal liquid supply flow of the refrigerant pump according to the pressure ratio percentage and the power percentage; and determining the optimal liquid supply flow of the refrigerant pump according to the pressure ratio percentage and the power percentage and the liquid supply flow calculation formula.
Preferably, before determining the optimal liquid supply flow rate of the refrigerant pump according to the operation state of the unit, the method further comprises: collecting the pressure ratio percentages corresponding to different operating conditions, the power percentages corresponding to different operating loads and the liquid supply flow of a refrigerant pump; and fitting a liquid supply flow calculation formula according to the pressure ratio percentages corresponding to different operating conditions, the power percentages corresponding to different operating loads and the liquid supply flow of the refrigerant pump.
Further, fitting a liquid supply flow calculation formula according to the pressure ratio percentages corresponding to different operating conditions, the power percentages corresponding to different operating loads and the liquid supply flow of the refrigerant pump, wherein the fitting calculation formula comprises the following steps: taking the pressure ratio percentages corresponding to different operating conditions and the power percentages corresponding to different operating loads as dependent variables, and taking the liquid supply flow of the refrigerant pump as a target variable; adjusting the liquid supply flow of the refrigerant pump to optimize the energy efficiency of the compressor, and obtaining the optimal liquid supply flow of the refrigerant pump corresponding to different pressure ratio percentages and different power percentages; and fitting a liquid supply flow calculation formula according to the optimal liquid supply flow of the refrigerant pump corresponding to different pressure ratio percentages and different power percentages.
Wherein, the calculation formula of the liquid supply flow is as follows: a is0+a1×X1+a2×X2+a3×X1 2+a4×X1×X2+a5×X2 2Wherein a0, a1, a2, a3, a4 and a5 are all empirical coefficients, X1 is the percentage of pressure ratio, and X2 is the percentage of power.
The opening degree of the refrigerant pump is controlled according to the optimal liquid supply flow, and the method comprises the following steps: determining the opening degree of a refrigerant pump corresponding to the optimal liquid supply flow according to the optimal liquid supply flow; and the opening degree of the refrigerant pump is sent to a main board of the refrigerant pump so as to control the refrigerant pump to adjust the opening degree of the refrigerant pump according to the preset adjusting step and the preset adjusting period, and the optimal liquid supply flow is achieved.
Optionally, the refrigerant pump is a variable frequency pump or a fixed frequency pump; when the refrigerant pump is a fixed-frequency pump, the opening degree of the refrigerant pump is controlled according to the optimal liquid supply flow, and the method comprises the following steps: and determining the opening of a throttle valve of the refrigerant pump according to the optimal liquid supply flow so as to adjust the liquid supply flow of the refrigerant pump.
The refrigerant pump preferentially adopts a variable frequency pump, a throttle valve is not required to be arranged on the same pipeline of the variable frequency pump, and the opening degree of the refrigerant pump is controlled by adjusting the rotating speed of the pump, so that the liquid supply flow of the bearing is controlled. When the refrigerant pump adopts a fixed-frequency pump, a throttle valve is required to be arranged on the same pipeline, the liquid supply flow of the bearing is controlled by adjusting the opening degree of the throttle valve, and the throttle valve is arranged at the upstream or the downstream of the fixed-frequency pump.
The method is suitable for a rotary mechanical system with liquid refrigerants, such as: the bearing may be a sliding bearing or a rolling bearing, and the rolling bearing is preferably used because the viscosity of the refrigerant is low.
In preferred embodiment 1 of the present invention, another alternative refrigerant pump control method is further provided, specifically, fig. 4 shows an alternative flowchart of the method, and as shown in fig. 4, the method includes the following steps S402 to S408:
s402: detecting real-time working conditions;
s404: calculating an optimal liquid supply flow proportion coefficient;
s406: calculating the optimal liquid supply flow;
s408: an optimal opening value is determined.
In the above embodiment, in order to find the theoretically optimal liquid supply flow rate under different load conditions and different loads, two corresponding relationships need to be determined: optimal liquid supply flow (proportionality coefficient relative to nominal condition) under different working conditions and different loads; and the target opening degree of the refrigerant pump corresponding to the optimal liquid supply flow.
In order to determine the optimal liquid supply flow under different working conditions and different loads, the pressure ratio and the power under the real-time working condition are taken as reference quantities (both are proportionality coefficients relative to the nominal working condition), namely independent variables (the working condition is limited by the pressure ratio value, and the load is limited by the power value), and the liquid supply flow under the real-time working condition (the flow capacity of a refrigerant pump) is taken as target variables, namely dependent variables. Based on experimental data of a large number of manually matched refrigerant pumps and around the basic theoretical relationship of pressure ratio-load-flow: the larger the pressure ratio, the smaller the flow; the greater the load, the greater the flow.
Setting data values (reference pressure ratio and reference power value) under reference working conditions (such as nominal refrigeration working conditions, nominal heating working conditions and the like) as reference values, taking the pressure ratio percentage X1 and the power percentage X2 under real-time working conditions as independent variables participating in calculation, taking the optimal liquid supply flow ratio coefficient Y under real-time working conditions as a dependent variable, and fitting a calculation formula:
Y＝a0+a1×X1+a2×X2+a3×X1 2+a4×X1×X2+a5×X2 2and a0-a5 is an empirical coefficient, an optimal liquid supply flow rate proportional coefficient of the refrigerant pump under the real-time working condition is obtained, corresponding flow rate is obtained through conversion, and then the optimal opening degree value of the electronic expansion valve under the real-time working condition is calculated, and the electronic expansion valve moves to the target opening degree.
The invention provides a refrigerant pump control scheme: the method comprises the steps of taking the liquid supply flow of a refrigerant pump as a control target, calculating the optimal liquid supply flow coefficient of the refrigerant pump under a real-time working condition through a large amount of matched experimental data, feeding the optimal liquid supply flow coefficient back to a unit main board for processing, directly sending a specific opening command to a small main board of the refrigerant pump, and enabling the opening of the real-time refrigerant pump to move to the target opening according to a motion step and a motion period. When the working condition or the load changes, the same scheme is adopted to gradually act to the real-time optimal opening value.
Example 2
Based on the refrigerant pump control method provided in the foregoing embodiment 1, in a preferred embodiment 2 of the present invention, a refrigerant pump control device is further provided, and specifically, fig. 5 shows an optional structural block diagram of the device, and as shown in fig. 5, the device includes:
the system comprises a detection module 502 for detecting the running state of the unit, wherein the running state of the unit at least comprises a running condition and a running load;
the liquid supply flow rate determining module 504 is connected with the detecting module 502 and is used for determining the optimal liquid supply flow rate of the refrigerant pump according to the running state of the unit;
and the opening degree determining module 506 is connected with the liquid supply flow rate determining module 504 and is used for controlling the opening degree of the refrigerant pump according to the optimal liquid supply flow rate.
In the above embodiment, the operation state of the unit is detected, where the operation state of the unit at least includes an operation condition and an operation load, and then the optimum liquid supply flow rate of the refrigerant pump is determined according to the operation state of the unit, so as to control the opening degree of the refrigerant pump. The corresponding optimal liquid supply flow is adopted as a control target for different working conditions and different loads, the control method is accurate, stable and reliable, the comprehensive energy efficiency of the unit can be remarkably improved, and the reliability of the unit operation is enhanced.
Further, the feed flow determination module 504 includes: the pressure ratio determining unit is used for determining the pressure ratio of the corresponding compressor according to the operation condition; the power determining unit is used for determining the power of the corresponding unit according to the operation load; and the optimal liquid supply flow determining unit is used for determining the optimal liquid supply flow of the refrigerant pump according to the pressure ratio of the compressor and the power of the unit.
Wherein the optimum liquid supply flow rate determining unit includes: a first calculating subunit for calculating a pressure ratio percentage of a pressure ratio of the compressor with respect to a reference pressure ratio; the second calculating subunit is used for calculating the power percentage of the power of the unit relative to the reference power; the acquisition unit is used for acquiring a liquid supply flow calculation formula, wherein the calculation formula is used for calculating the optimal liquid supply flow of the refrigerant pump according to the pressure ratio percentage and the power percentage; and the determining subunit is used for determining the optimal liquid supply flow of the refrigerant pump according to the pressure ratio percentage, the power percentage and the liquid supply flow calculation formula.
Further, the device also comprises: and the calculation formula determination module is used for acquiring the pressure ratio percentages corresponding to different operating conditions, the power percentages corresponding to different operating loads and the liquid supply flow of the refrigerant pump before determining the optimal liquid supply flow of the refrigerant pump according to the operating state of the unit, and fitting a liquid supply flow calculation formula according to the pressure ratio percentages corresponding to different operating conditions, the power percentages corresponding to different operating loads and the liquid supply flow of the refrigerant pump.
Wherein, the calculation formula determination module comprises: the variable determining unit is used for taking the pressure ratio percentages corresponding to different operating conditions and the power percentages corresponding to different operating loads as dependent variables and taking the liquid supply flow of the refrigerant pump as a target variable; the adjusting unit is used for adjusting the liquid supply flow of the refrigerant pump so as to optimize the energy efficiency of the compressor and obtain the optimal liquid supply flow of the refrigerant pump corresponding to different pressure ratio percentages and different power percentages; and the fitting unit is used for fitting a liquid supply flow calculation formula according to the optimal liquid supply flow of the refrigerant pump corresponding to different pressure ratio percentages and different power percentages.
Wherein, the calculation formula of the liquid supply flow is as follows: a is0+a1×X1+a2×X2+a3×X1 2+a4×X1×X2+a5×X2 2Wherein a0, a1, a2, a3, a4 and a5 are all empirical coefficients, X1 is the percentage of pressure ratio, and X2 is the percentage of power.
Further, the opening determining module 506 includes: the opening calculation unit is used for determining the opening of the refrigerant pump corresponding to the optimal liquid supply flow according to the optimal liquid supply flow; and the sending unit is used for sending the opening degree of the refrigerant pump to a main board of the refrigerant pump so as to control the refrigerant pump to adjust the opening degree of the refrigerant pump according to the preset adjusting step and the preset adjusting period, and the optimal liquid supply flow is achieved.
With regard to the apparatus in the above embodiments, the specific manner in which each unit and each module performs operations has been described in detail in the embodiments related to the method, and will not be described in detail herein.
Example 3
Based on the refrigerant pump control device provided in the above embodiment 2, in a preferred embodiment 3 of the present invention, an air conditioning unit is further provided, which includes the above refrigerant pump control device.
In the above embodiment, the operation state of the unit is detected, where the operation state of the unit at least includes an operation condition and an operation load, and then the optimum liquid supply flow rate of the refrigerant pump is determined according to the operation state of the unit, so as to control the opening degree of the refrigerant pump. The corresponding optimal liquid supply flow is adopted as a control target for different working conditions and different loads, the control method is accurate, stable and reliable, the comprehensive energy efficiency of the unit can be remarkably improved, and the reliability of the unit operation is enhanced.
Example 4
Based on the refrigerant pump control method provided in the above embodiment 1, in a preferred embodiment 4 of the present invention, a storage medium containing computer executable instructions is further provided, and the computer executable instructions are executed by a computer processor to perform the refrigerant pump control method as described above.
In the above embodiment, the operation state of the unit is detected, where the operation state of the unit at least includes an operation condition and an operation load, and then the optimum liquid supply flow rate of the refrigerant pump is determined according to the operation state of the unit, so as to control the opening degree of the refrigerant pump. The corresponding optimal liquid supply flow is adopted as a control target for different working conditions and different loads, the control method is accurate, stable and reliable, the comprehensive energy efficiency of the unit can be remarkably improved, and the reliability of the unit operation is enhanced.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (9)
1. A method of controlling a refrigerant pump for providing liquid refrigerant to a bearing of a compressor, the method comprising:
detecting the running state of a unit, wherein the running state of the unit at least comprises a running working condition and a running load;
determining the optimal liquid supply flow of a refrigerant pump according to the running state of the unit;
controlling the opening degree of the refrigerant pump according to the optimal liquid supply flow;
the method for determining the optimal liquid supply flow of the refrigerant pump according to the running state of the unit comprises the following steps of:
determining the pressure ratio of the corresponding compressor according to the operating condition;
determining the power of the corresponding unit according to the operation load;
and determining the optimal liquid supply flow of the refrigerant pump according to the pressure ratio of the compressor and the power of the unit.
2. The method of claim 1, wherein determining an optimal liquid feed flow rate of the refrigerant pump based on a pressure ratio of the compressor and a power of the unit comprises:
calculating a pressure ratio percentage of a pressure ratio of the compressor relative to a reference pressure ratio;
calculating the power percentage of the power of the unit relative to the reference power;
obtaining a liquid supply flow calculation formula, wherein the liquid supply flow calculation formula is used for calculating the optimal liquid supply flow of the refrigerant pump according to the pressure ratio percentage and the power percentage;
and determining the optimal liquid supply flow of the refrigerant pump according to the pressure ratio percentage, the power percentage and the liquid supply flow calculation formula.
3. The method of claim 2, further comprising, prior to determining the optimal feed flow rate of the refrigerant pump based on the operating condition of the unit:
collecting pressure ratio percentages corresponding to different operating conditions, power percentages corresponding to different operating loads and liquid supply flow of the refrigerant pump;
and fitting the liquid supply flow calculation formula according to the pressure ratio percentages corresponding to different operating conditions, the power percentages corresponding to different operating loads and the liquid supply flow of the refrigerant pump.
4. The method of claim 3, wherein fitting the feed flow calculation formula according to the pressure ratio percentages corresponding to the different operating conditions, the power percentages corresponding to the different operating loads, and the feed flow of the refrigerant pump comprises:
taking the pressure ratio percentages corresponding to different operating conditions and the power percentages corresponding to different operating loads as dependent variables, and taking the liquid supply flow of the refrigerant pump as a target variable;
adjusting the liquid supply flow of the refrigerant pump to optimize the energy efficiency of the compressor, and obtaining the optimal liquid supply flow of the refrigerant pump corresponding to different pressure ratio percentages and different power percentages;
and fitting the liquid supply flow calculation formula according to the optimal liquid supply flow of the refrigerant pump corresponding to the different pressure ratio percentages and the different power percentages.
5. The method of claim 4, wherein the feed flow calculation formula is:
Y＝a0+a1×X1+a2×X2+a3×X1 2+a4×X1×X2+a5×X2 2wherein a0, a1, a2, a3, a4, a5 is an empirical coefficient, Y is the feed liquid flow, X1 is the pressure ratio percentage, and X2 is the power percentage.
6. The method of claim 1, wherein controlling the opening of the refrigerant pump based on the optimal liquid feed flow comprises:
determining the opening degree of the refrigerant pump corresponding to the optimal liquid supply flow according to the optimal liquid supply flow;
and sending the opening degree of the refrigerant pump to a main board of the refrigerant pump so as to control the refrigerant pump to adjust the opening degree of the refrigerant pump according to a preset adjusting step and a preset adjusting period, thereby achieving the optimal liquid supply flow.
7. A refrigerant pump control apparatus, the refrigerant pump for providing liquid refrigerant to a bearing of a compressor, the apparatus comprising:
the system comprises a detection module, a control module and a control module, wherein the detection module is used for detecting the running state of a unit, and the running state of the unit at least comprises a running working condition and a running load;
the liquid supply flow determining module is used for determining the optimal liquid supply flow of the refrigerant pump according to the running state of the unit;
the opening determining module is used for controlling the opening of the refrigerant pump according to the optimal liquid supply flow;
wherein the liquid supply flow determination module comprises: the pressure ratio determining unit is used for determining the pressure ratio of the corresponding compressor according to the operation condition; the power determining unit is used for determining the power of the corresponding unit according to the operation load; and the optimal liquid supply flow determining unit is used for determining the optimal liquid supply flow of the refrigerant pump according to the pressure ratio of the compressor and the power of the unit.
8. An air conditioning unit comprising the refrigerant pump control device as recited in claim 7.
9. A storage medium containing computer-executable instructions for performing the refrigerant pump control method of any of claims 1 to 6 when executed by a computer processor.
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| CN201911313055.7A CN111102695B (en) | 2019-12-18 | 2019-12-18 | Refrigerant pump control method and device and air conditioning unit |
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| CN201911313055.7A CN111102695B (en) | 2019-12-18 | 2019-12-18 | Refrigerant pump control method and device and air conditioning unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5182919A (en) * | 1990-01-18 | 1993-02-02 | Ebara Corporation | Oil recovery system for closed type centrifugal refrigerating machine |
| IL109967A (en) * | 1993-06-15 | 1997-07-13 | Multistack Int Ltd | Compressor |
| US6176092B1 (en) * | 1998-10-09 | 2001-01-23 | American Standard Inc. | Oil-free liquid chiller |
| CN104807114B (en) * | 2015-03-19 | 2018-08-03 | 珠海格力电器股份有限公司 | Cooling system and air-conditioning system |
| CN106091188A (en) * | 2016-06-12 | 2016-11-09 | 重庆美的通用制冷设备有限公司 | Refrigeration unit |
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2019
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