CN112460865A - Refrigeration oil self-circulation heating device, control method thereof and water chilling unit - Google Patents
Refrigeration oil self-circulation heating device, control method thereof and water chilling unit Download PDFInfo
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- CN112460865A CN112460865A CN202011418977.7A CN202011418977A CN112460865A CN 112460865 A CN112460865 A CN 112460865A CN 202011418977 A CN202011418977 A CN 202011418977A CN 112460865 A CN112460865 A CN 112460865A
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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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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- 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
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Abstract
The invention discloses a refrigeration oil self-circulation heating device, a control method thereof and a water chilling unit. Wherein, the device includes: the oil separator is arranged between a compressor and a condenser of the unit; the temperature sensor is arranged on the oil separator and used for detecting the temperature of the refrigeration oil in the oil separator; the electric heating element is arranged on the oil separator and used for heating the refrigeration oil in the oil separator; the oil separator is provided with an inlet and an outlet of the self-circulation loop, and an oil pump and a first valve are arranged between the inlet and the outlet of the self-circulation loop and used for realizing self-circulation of the refrigeration oil in the oil separator. By the invention, the self-circulation and uniform heating of the refrigeration oil can be realized, the precise control of the electric heating element can be realized, the optimal refrigeration oil viscosity required by starting the compressor is ensured, and the operation reliability of the unit is improved. Meanwhile, the refrigeration oil can be started after the temperature of the refrigeration oil reaches the preset temperature, and the waste of time cost and electric energy cost is avoided.
Description
Technical Field
The invention relates to the technical field of water chilling units, in particular to a refrigeration oil self-circulation heating device, a control method thereof and a water chilling unit.
Background
The large water-cooled screw type water chilling unit is commonly used for centralized cooling/heating in places such as large public buildings, national defense and military industry, data machine rooms, rail transit and the like. The compressor is used as a core component, a bearing of the compressor needs refrigeration oil for lubrication, and a meshing gap needs an oil film for sealing, so that the refrigeration oil with proper viscosity is very important for the reliable operation of the compressor.
Under the condition of long-term shutdown of the unit, due to the change of the external environment temperature, the refrigerant can migrate into the refrigeration oil and is mutually soluble with the refrigeration oil. The unit needs to preheat the refrigeration oil before starting up, so that the refrigerant is separated from the refrigeration oil, the viscosity of the refrigeration oil is improved, and oil leakage of the unit during starting up is prevented.
In the prior art, the unit preheating is mainly realized by heating the refrigeration oil through an electric heating element in an oil separator (also called an oil drum), but the conventional operation is that the unit starts preheating after being electrified, the preheating time is completely controlled manually, the electric heating element can only partially heat due to the fact that the refrigeration oil has no fluidity, and the preheating effect is judged by experience, so that the unit is easy to have the phenomena of poor preheating or excessive preheating and electric energy waste and the like.
Aiming at the problems that the preheating effect on the refrigeration oil is poor and the resource waste is easily caused before the unit is started in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a refrigeration oil self-circulation heating device, a control method thereof and a water chilling unit, and aims to solve the problems that the pre-heating effect of the unit before starting up is poor and resource waste is easily caused in the prior art.
In order to solve the technical problem, the invention provides a refrigeration oil self-circulation heating device, wherein the device comprises: the oil separator is arranged between a compressor and a condenser of the unit; the temperature sensor is arranged on the oil separator and used for detecting the temperature of the refrigeration oil in the oil separator; the electric heating element is arranged on the oil separator and used for heating the refrigeration oil in the oil separator; the oil separator is provided with an inlet and an outlet of a self-circulation loop, and an oil pump and a first valve are arranged between the inlet and the outlet of the self-circulation loop and used for realizing self-circulation of the refrigeration oil in the oil separator.
Further, the apparatus further comprises: the second valve is arranged on an oil return pipeline between the compressor and an outlet of the self-circulation loop; and one end of the oil pump, which is far away from the oil separator, is connected into the oil return pipeline, and the oil pump is positioned between the oil separator and the second valve.
Further, the temperature sensor is disposed at a lower side of the oil separator; the electric heating element is disposed at a lower side of the oil separator.
Further, the first valve and the second valve are solenoid valves.
The invention also provides a refrigeration oil self-circulation heating control method, which is applied to the refrigeration oil self-circulation heating device, wherein the method comprises the following steps: after the unit receives a starting command, detecting the temperature of the refrigeration oil in the oil separator; and if the temperature of the refrigeration oil does not reach the preset temperature, heating the refrigeration oil, and realizing the self-circulation of the refrigeration oil in the oil separator in the heating process.
Further, detecting the temperature of the refrigeration oil in the oil separator includes: periodically detecting the temperature of the refrigeration oil in the oil separator for preset times; and calculating the average value of the detection results of the preset times as the finally determined temperature of the refrigeration oil.
Further, after the unit receives the boot command, the method includes: and controlling the opening of an oil pump on a self-circulation loop of the oil separator.
Further, heating the refrigeration oil, and effecting self-circulation of the refrigeration oil in the oil separator during heating, comprises: controlling an electric heating element to be started so as to heat the refrigeration oil; and controlling a first valve on a self-circulation loop of the oil separator to be opened and controlling a second valve to be closed so as to realize self-circulation of the frozen oil in the oil separator.
Further, after heating the refrigeration oil and achieving self-circulation of the refrigeration oil in the oil separator during heating, the method further comprises: detecting a change in temperature of the refrigeration oil; stopping heating the frozen oil and stopping self-circulation of the frozen oil in the oil separator after the temperature of the frozen oil reaches a preset temperature; and controlling the unit to execute the starting action.
Further, stopping heating of the frozen oil, and stopping self-circulation of the frozen oil in the oil separator, comprises: controlling an electric heating element to be closed so as to stop heating the refrigeration oil; and controlling an oil pump and a first valve on a self-circulation loop of the oil separator to be closed, and controlling a second valve on an oil return pipeline to be opened so as to stop self-circulation of the frozen oil in the oil separator.
Further, after the temperature of the refrigeration oil in the oil separator is detected, if the temperature of the refrigeration oil reaches a preset temperature, an oil pump and a first valve on a self-circulation loop of the oil separator are controlled to be closed, and a second valve on an oil return pipeline is controlled to be opened; and controlling the unit to execute the starting action.
The invention also provides a water chilling unit, wherein the water chilling unit comprises the frozen oil self-circulation heating device.
The invention also provides a computer-readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the method as described above.
By applying the technical scheme of the invention, the self-circulation and uniform heating of the refrigeration oil can be realized, the accurate control of the electric heating element can be realized, the optimal refrigeration oil viscosity required by starting the compressor is ensured, and the operation reliability of the unit is improved. Meanwhile, the refrigeration oil can be started after the temperature of the refrigeration oil reaches the preset temperature, and the waste of time cost and electric energy cost is avoided.
Drawings
FIG. 1 is a block diagram of an embodiment of the invention;
FIG. 2 is a flow chart of a method of chilled oil self-circulation heating control according to an embodiment of the present invention;
fig. 3 is a control flow diagram of the self-circulation heating of the refrigeration oil according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention 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, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe the first valve, second valve, etc. in embodiments of the present invention, these first valve, second valve should not be limited to these terms. These terms are only used to distinguish the valves. For example, a first valve may also be referred to as a second valve, and similarly, a second valve may also be referred to as a first valve, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The embodiment provides a refrigeration oil self-circulation heating device, which is applied to a unit, and particularly can be a water-cooling screw type water chilling unit. Fig. 1 is a schematic diagram of an assembly architecture according to an embodiment of the present invention, and as shown in fig. 1, a refrigerant oil self-circulation heating device includes:
the oil separator 1 is arranged between a compressor 2 and a condenser 3 of the water chilling unit; a temperature sensor 4 provided in the oil separator 1 and detecting a temperature of the refrigerant oil in the oil separator 1; and the electric heating element 5 is arranged on the oil separator 1 and used for heating the refrigeration oil in the oil separator 1.
In order to achieve uniform heating of the refrigeration oil of the oil separator, a self-circulation loop of the refrigeration oil is provided, specifically, an inlet 6 and an outlet 7 of the self-circulation loop are provided on the oil separator 1 and are generally arranged at two sides of the oil separator 1, and the inlet 6 and the outlet 7 of the self-circulation loop are preferably arranged at the lower half part of the oil separator 1 because the refrigeration oil generally sinks after the refrigerant and the refrigeration oil are separated. An oil pump 8 and a first valve 9 are arranged between the inlet 6 and the outlet 7 of the self-circulation circuit for realizing self-circulation of the refrigeration oil in the oil separator 1. After the electric heating element 5 starts heating, the refrigerant oil and the refrigerant are separated, and the refrigerant oil sinks to the bottom of the oil separation. Therefore, the temperature sensor 4 is generally disposed below the oil separator 1, and the electric heating element 5 is also generally disposed below the oil separator 1. Specifically, it may be at or near the bottom of the oil separator 1, for example, at a position below the middle of the oil separator 1. The accuracy of temperature detection can be guaranteed, and the heating effect of the refrigeration oil can also be guaranteed. In fig. 1 of the present embodiment, the temperature sensor 4 is disposed below an inlet 6 of the self-circulation circuit, and the electric heating element 5 is disposed below an outlet 7 of the self-circulation circuit. In addition, in order to ensure that the refrigeration oil can smoothly enter the self-circulation loop, the height of the inlet 6 is required to be higher than that of the outlet 7.
The above-mentioned device still includes: a second valve 10 is arranged in the return line between the compressor 2 and the outlet 7 of the self-circulation circuit. After the temperature of the refrigeration oil is heated to the preset temperature, the oil pump 8 and the first valve 9 are controlled to be closed, namely, the self-circulation loop is cut off. And controlling the second valve 10 to be opened, so that the unit can be started normally, and the refrigeration oil can return to the compressor 2 from the oil separator 1, thereby realizing the normal operation of the unit.
In addition, in order to avoid the situation that the oil return is difficult due to small pressure difference during the oil return twisting, the oil pump 8 is arranged in the embodiment, one end of the oil pump 8, which is far away from the oil separator 1, is connected into the oil return pipeline, and the oil pump 8 is positioned between the oil separator 1 and the second valve 10. Therefore, when oil return is difficult (for example, when the pressure difference of the oil return pipeline is detected to be lower than a preset threshold value), the oil pump 8 is controlled to be opened, so that smooth oil return is ensured.
It should be noted that fig. 1 further includes an evaporator 12 and an electronic expansion valve 13, which constitute a conventional structure of the unit. The first valve 9 and the second valve 10 mentioned in this embodiment may be solenoid valves, so that signal control may be implemented to control the opening and closing of the two valves according to the temperature of the frozen oil in the oil separator.
The embodiment also provides a water chilling unit, which comprises the refrigeration oil self-circulation heating device introduced above.
Example 2
Fig. 2 is a flowchart of a method for controlling self-circulation heating of refrigeration oil according to an embodiment of the present invention, which is applied to the refrigeration oil self-circulation heating apparatus described in the above embodiment, and as shown in fig. 2, the method includes the following steps:
step S201, after the unit receives a starting command, detecting the temperature of the refrigeration oil in the oil separator;
and S202, if the temperature of the frozen oil does not reach the preset temperature, heating the frozen oil, and realizing self-circulation of the frozen oil in the oil separator in the heating process.
Step S203, if the temperature of the refrigeration oil reaches the preset temperature, controlling an oil pump and a first valve on a self-circulation loop of the oil separator to be closed, and controlling a second valve on an oil return pipeline to be opened; and then the unit is controlled to execute the starting action, and the unit can normally start and run.
Through this embodiment, can realize self-loopa, the even heating of refrigeration oil, can realize electric heating element's accurate control simultaneously, guarantee the required best refrigeration oil viscosity of compressor start, promote unit operational reliability. Meanwhile, the refrigeration oil can be started after the temperature of the refrigeration oil reaches the preset temperature, and the waste of time cost and electric energy cost is avoided.
When the temperature of the refrigeration oil in the oil separator is detected, the temperature can be detected by a temperature sensor arranged on the oil separator, specifically, the primary detection result of the temperature sensor can be used as the finally determined temperature of the refrigeration oil, or the temperature of the refrigeration oil in the oil separator can be periodically detected for the preset times, and the average value of the detection results of the preset times is obtained to be used as the finally determined temperature of the refrigeration oil. Multiple detections can improve the accuracy of the detection. In specific implementation, the detection may be performed for a predetermined number of times, for example, five times, or for a predetermined period of time, for example, for a period of 3 minutes. In any way, the accuracy of the detection result can be ensured.
After the temperature of the refrigeration oil is detected, when the temperature of the refrigeration oil is compared with the preset temperature, the temperature of the refrigeration oil of one detection result can be compared with the preset temperature, the temperature of the refrigeration oil of a plurality of detection results can also be compared with the preset temperature, and in the plurality of detection results, if the temperature of the refrigeration oil exceeding three times (preset time threshold value) reaches the preset temperature, the temperature of the refrigeration oil is indicated to reach the preset temperature. Based on this, the accuracy of the temperature determination result can be improved.
If the refrigeration oil temperature does not reach preset temperature, the refrigerant and the refrigeration oil are mutually soluble, and at the moment, if the unit is directly started, oil leakage is easily caused, so that the refrigeration oil is required to be heated to the preset temperature. Specifically, the electric heating element is controlled to be started to heat the refrigeration oil; and controlling a first valve on a self-circulation loop of the oil separator to be opened and controlling a second valve to be closed so as to realize self-circulation of the frozen oil in the oil separator. That is, while heating the refrigeration oil, the refrigeration oil circulates in the self-circulation loop, thereby realizing uniform heating and improving heating efficiency and effect. It should be noted that, after the unit receives a start-up command, the oil pump on the self-circulation loop of the oil separator is powered on and opened, so as to prepare for subsequent self-circulation or oil return of the refrigeration oil.
The control electric heating element is opened, the oil pump and the first valve on the self-circulation loop of the oil separator are controlled to be opened, and the second valve is controlled to be closed. It does not represent a transition of the operating state (e.g., on or off) of the above-described components, and it is also possible to continue to maintain the previous operating state. For example, if the unit was previously in a long standby state, then the second valve should be energized, which is an open state. But if the unit was previously in a power-off shutdown state, then the second valve should be in a closed state.
Detecting a change in the temperature of the refrigeration oil after the refrigeration oil is heated and self-circulation of the refrigeration oil in the oil separator is achieved during the heating; and stopping heating the frozen oil after the temperature of the frozen oil reaches the preset temperature, and stopping self-circulation of the frozen oil in the oil separator. Specifically, the electric heating element is controlled to be turned off to stop heating the refrigeration oil; and the oil pump and the first valve on the self-circulation loop of the oil separator are controlled to be closed, the second valve on the oil return pipeline is controlled to be opened, so that the self-circulation of the refrigeration oil in the oil separator is stopped, and the refrigeration oil can be returned to the compressor for use through the oil return pipeline, so that the normal operation of the unit is facilitated. And then, the control unit executes the starting action. On the basis, the refrigerant and the refrigeration oil in the oil separator are smoothly separated, the temperature of the refrigeration oil is proper, and the unit can be normally started to operate.
Example 3
Fig. 3 is a control flow chart of the self-circulation heating of the refrigeration oil according to the embodiment of the present invention, as shown in fig. 3, the flow chart includes the following steps:
step S301, the unit receives a starting command.
In step S302, the oil pump is controlled to be turned on (energized), and the temperature of the refrigeration oil is detected.
Specifically, the temperature sensor is every taAnd detecting a group of data in seconds (for example, 5 seconds), and averaging every time N groups (for example, 5 groups) of data are collected, wherein if the average value of 3 times of continuous times is greater than the preset temperature Ta, the refrigerating oil temperature is greater than Ta, and otherwise, the refrigerating oil temperature is less than or equal to Ta.
Step S303, the temperature of the refrigerating oil is greater than Ta.
And step S304, controlling the oil pump to be closed, the first valve to be closed and the second valve to be opened.
In step S305, the unit executes a boot operation.
And S306, the temperature of the refrigerating oil is less than or equal to Ta.
In step S307, the electric heating element is controlled to be opened, the first valve is opened, and the second valve is closed. At this time, the refrigerant oil in the oil separator (oil drum) starts to perform self-circulation, the temperature of the refrigerant oil rises, and the refrigerant in the refrigerant oil continuously volatilizes.
Step S308, the temperature of the refrigeration oil is continuously detected. Specifically, after the electric heating element is electrified for t1 time, the temperature sensor detects a group of data at intervals of Ta, an average value is obtained every time N groups of data are collected, if the average value for 3 times is still less than or equal to Ta, all the electric elements and the oil pump continue to operate according to the previous state.
In step S309, it is judged whether the temperature of the refrigeration oil is greater than Ta. If yes, step S310 is performed, and if no, step S308 is continuously performed.
And step S310, controlling the electric heating element to be closed, closing the oil pump, closing the first valve and opening the second valve. Then, step S305 is performed.
Therefore, the present embodiment can realize self-circulation of the refrigeration oil and uniformly heat the refrigeration oil. The precise control of the temperature of the refrigeration oil and the on/off of the electric heating element is realized. The refrigeration cycle can be started after the temperature of the refrigeration oil reaches the preset temperature, so that the waste of time cost and electric energy cost is avoided. Effectively guarantee the viscosity of refrigeration oil, promote unit operational reliability.
Example 4
The embodiment of the present invention provides software for implementing the technical solutions described in the above embodiments and preferred embodiments.
Embodiments of the present invention provide a non-volatile computer storage medium, where computer-executable instructions are stored, and the computer-executable instructions may execute the method for controlling self-circulation heating of refrigeration oil in any of the above method embodiments.
The storage medium stores the software, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
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: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. A self-circulating refrigeration oil heating apparatus, said apparatus comprising:
the oil separator is arranged between a compressor and a condenser of the unit;
the temperature sensor is arranged on the oil separator and used for detecting the temperature of the refrigeration oil in the oil separator;
the electric heating element is arranged on the oil separator and used for heating the refrigeration oil in the oil separator;
the oil separator is provided with an inlet and an outlet of a self-circulation loop, and an oil pump and a first valve are arranged between the inlet and the outlet of the self-circulation loop and used for realizing self-circulation of the refrigeration oil in the oil separator.
2. The apparatus of claim 1, further comprising:
the second valve is arranged on an oil return pipeline between the compressor and an outlet of the self-circulation loop;
and one end of the oil pump, which is far away from the oil separator, is connected into the oil return pipeline, and the oil pump is positioned between the oil separator and the second valve.
3. The apparatus of claim 1,
the temperature sensor is arranged at the lower side of the oil separator; the electric heating element is disposed at a lower side of the oil separator.
4. The device according to any one of claims 1 to 3,
the first valve and the second valve are solenoid valves.
5. A self-circulation heating control method for refrigeration oil, which is applied to the self-circulation heating device for refrigeration oil according to any one of claims 1 to 4, and is characterized by comprising the following steps:
after the unit receives a starting command, detecting the temperature of the refrigeration oil in the oil separator;
and if the temperature of the refrigeration oil does not reach the preset temperature, heating the refrigeration oil, and realizing the self-circulation of the refrigeration oil in the oil separator in the heating process.
6. The method of claim 5, wherein sensing a temperature of the refrigeration oil in the oil separator comprises:
periodically detecting the temperature of the refrigeration oil in the oil separator for preset times;
and calculating the average value of the detection results of the preset times as the finally determined temperature of the refrigeration oil.
7. The method of claim 5, wherein after the unit receives the power-on command, the method comprises:
and controlling the opening of an oil pump on a self-circulation loop of the oil separator.
8. The method of claim 5, wherein heating the refrigeration oil and effecting self-circulation of the refrigeration oil in the oil separator during heating comprises:
controlling an electric heating element to be started so as to heat the refrigeration oil;
and controlling a first valve on a self-circulation loop of the oil separator to be opened and controlling a second valve to be closed so as to realize self-circulation of the frozen oil in the oil separator.
9. The method of claim 5, wherein the frozen oil is heated, and after self-circulation of the frozen oil in the oil separator is achieved during heating, the method further comprises:
detecting a change in temperature of the refrigeration oil;
stopping heating the frozen oil and stopping self-circulation of the frozen oil in the oil separator after the temperature of the frozen oil reaches a preset temperature;
and controlling the unit to execute the starting action.
10. The method of claim 9, wherein stopping heating of the frozen oil and stopping self-circulation of the frozen oil in the oil separator comprises:
controlling an electric heating element to be closed so as to stop heating the refrigeration oil;
and controlling an oil pump and a first valve on a self-circulation loop of the oil separator to be closed, and controlling a second valve on an oil return pipeline to be opened so as to stop self-circulation of the frozen oil in the oil separator.
11. The method of claim 5, wherein after detecting the temperature of the refrigeration oil in the oil separator, the method further comprises:
if the temperature of the refrigeration oil reaches a preset temperature, controlling an oil pump and a first valve on a self-circulation loop of the oil separator to be closed, and controlling a second valve on an oil return pipeline to be opened;
and controlling the unit to execute the starting action.
12. A water chilling unit, characterized in that it comprises the chilled oil self-circulation heating device of any one of claims 1 to 4.
13. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 5 to 11.
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| CN106969562A (en) * | 2016-01-13 | 2017-07-21 | 珠海格力电器股份有限公司 | Oil eliminator and the air-conditioning system with it |
| CN107269538A (en) * | 2017-08-14 | 2017-10-20 | 珠海格力电器股份有限公司 | Oil groove system, compressor assembly and air-conditioning |
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2020
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| DD257470A1 (en) * | 1987-02-02 | 1988-06-15 | Halle Maschf Veb | METHOD AND DEVICE FOR ADJUSTING THE VISCOSITY OF THE OIL CASE AGGREGATE IN THE OIL CIRCUIT OF A SCREW COMPRESSOR |
| CN101514854A (en) * | 2009-01-13 | 2009-08-26 | 浙江盾安机电科技有限公司 | Energy-saving type high-temperature water chilling unit |
| CN103867449A (en) * | 2012-12-18 | 2014-06-18 | 珠海格力电器股份有限公司 | Compressor oil supply system and control method |
| CN106969562A (en) * | 2016-01-13 | 2017-07-21 | 珠海格力电器股份有限公司 | Oil eliminator and the air-conditioning system with it |
| CN107269538A (en) * | 2017-08-14 | 2017-10-20 | 珠海格力电器股份有限公司 | Oil groove system, compressor assembly and air-conditioning |
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Application publication date: 20210309 |