CN112629076B - Oil return system, air conditioner and control method of oil return system - Google Patents
Oil return system, air conditioner and control method of oil return system Download PDFInfo
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- CN112629076B CN112629076B CN202011555128.6A CN202011555128A CN112629076B CN 112629076 B CN112629076 B CN 112629076B CN 202011555128 A CN202011555128 A CN 202011555128A CN 112629076 B CN112629076 B CN 112629076B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005057 refrigeration Methods 0.000 claims abstract description 28
- 239000003507 refrigerant Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims description 28
- 238000001514 detection method Methods 0.000 claims description 9
- 239000003921 oil Substances 0.000 description 259
- 238000004590 computer program Methods 0.000 description 11
- 239000010726 refrigerant oil Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000003068 static effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000010721 machine oil Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
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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
- 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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Abstract
The invention provides an oil return system, an air conditioner and a control method of the oil return system, wherein the oil return system comprises: the oil separator is used for separating the refrigeration oil and the refrigerant; and one end of the oil return pipeline is connected to the oil separator, and the other end of the oil return pipeline is connected to a high-speed flow passage of a high-pressure cavity of the compressor and is used for enabling the refrigeration oil to flow into the high-pressure cavity from the oil separator by utilizing the pressure difference between an exhaust passage in the high-pressure cavity and the oil separator. The invention solves the technical problem of low volumetric efficiency of the compressor in the related technology, realizes the independence of the oil return port and the air suction port, improves the effective air suction volume of the compressor, increases the volumetric efficiency and further improves the operation energy efficiency of the whole machine.
Description
Technical Field
The invention relates to the field of automatic control, in particular to an oil return system, an air conditioner and a control method of the oil return system.
Background
In the related art, a compressor is a fluid machine for lifting low-pressure gas into high-pressure gas, and is a heart of a refrigeration system.
In the related art, one part of oil return of the compressor is brought back to the compressor by the rapid flow of the refrigerant in the pipe, and the other part of the oil return is separated by the oil separator and then returned to the suction port of the compressor by the throttling device. The refrigerant entering the scroll plate contains the refrigeration oil through the oil return of the low-pressure air pipe, the effective air suction volume of the compressor is reduced, the volume efficiency of the compressor is reduced, and the operation energy efficiency of the whole machine is reduced.
In view of the above problems in the related art, no effective solution has been found at present.
Disclosure of Invention
The embodiment of the invention provides an oil return system, an air conditioner and a control method of the oil return system, and aims to solve the technical problem that the volume efficiency of a compressor is low in the related art.
According to an embodiment of the present invention, there is provided an oil return system including: the oil separator is used for separating the refrigeration oil and the refrigerant; and one end of the oil return pipeline is connected to the oil separator, and the other end of the oil return pipeline is connected to a high-speed flow passage of a high-pressure cavity of the compressor and is used for enabling the refrigeration oil to flow into the high-pressure cavity from the oil separator by utilizing the pressure difference between an exhaust passage in the high-pressure cavity and the oil separator.
Optionally, the oil return system further includes: and the one-way valve is connected to the first outlet of the oil return pipeline and used for limiting the one-way flow of the refrigeration oil from the oil separator into the high-pressure cavity.
Optionally, the oil return system further includes: and the oil return valve is connected to a second outlet of the oil return pipeline and is used for enabling the refrigeration oil to flow into the air suction pipeline from the oil separator.
Optionally, the oil return system further includes: the first detection module is used for detecting the liquid level height of a refrigerating oil pool at the bottom of the compressor according to a period; and the first control module is used for controlling the opening of the oil return valve based on the liquid level height.
Optionally, the first control module is specifically configured to: if the liquid level height is larger than or equal to a first threshold value, reducing the current opening degree of the oil return valve; if the liquid level height is smaller than a first threshold value and larger than or equal to a second threshold value, maintaining the current opening degree of the oil return valve; and if the liquid level height is smaller than a second threshold value, increasing the current opening degree of the oil return valve, wherein the first threshold value is larger than the second threshold value.
Optionally, the oil return system further includes: the second detection module is used for periodically detecting the pressure difference between the exhaust passage and the oil separator; and the second control module is used for controlling the opening of the oil return valve based on the pressure difference.
Optionally, the second control module is specifically configured to: if the differential pressure is greater than or equal to a third threshold value, adjusting the current opening of the oil return valve to 0; if the differential pressure is smaller than a third threshold value and larger than or equal to a fourth threshold value, adjusting the current opening of the oil return valve to be a first opening; if the differential pressure is smaller than a fourth threshold value and larger than or equal to a fifth threshold value, adjusting the current opening of the oil return valve to be a second opening; and if the pressure difference is smaller than a fifth threshold, adjusting the current opening of the oil return valve to be the maximum opening, wherein the third threshold is larger than the fourth threshold, the fourth threshold is larger than the fifth threshold, and the second opening is larger than the first opening.
Optionally, the oil return system further includes: the third detection module is used for detecting the frequency of the compressor according to a period; and the third control module is used for controlling the opening of the oil return valve based on the frequency.
Optionally, the third control module is specifically configured to: if the frequency is greater than or equal to a sixth threshold value, adjusting the current opening of the oil return valve to 0; if the frequency is smaller than a sixth threshold and larger than or equal to a seventh threshold, adjusting the current opening of the oil return valve to a third opening; if the frequency is smaller than a seventh threshold value and larger than or equal to an eighth threshold value, adjusting the current opening of the oil return valve to be a fourth opening; if the frequency is smaller than an eighth threshold value, the current opening degree of the oil return valve is adjusted to be the maximum opening degree, wherein the sixth threshold value is larger than the seventh threshold value, the seventh threshold value is larger than the eighth threshold value, and the fourth opening degree is larger than the third opening degree.
Optionally, the second outlet is at a flow rear end of the first outlet.
According to another embodiment of the present invention, there is also provided an air conditioner including: an oil return system as described in the previous embodiments.
According to another embodiment of the present invention, there is also provided a control method of an oil return system, including: detecting an operating parameter of the compressor according to a period; and controlling the opening of the oil return valve based on the operation parameters, wherein the oil return valve is connected to an outlet of an oil return pipeline and is used for enabling the refrigeration oil to flow into an air suction pipeline from the oil separator.
Optionally, the operation parameter is a liquid level of a refrigerant oil pool at the bottom of the compressor, and controlling the opening of the oil return valve based on the operation parameter includes: if the liquid level height is larger than or equal to a first threshold value, reducing the current opening degree of the oil return valve; if the liquid level height is smaller than a first threshold value and larger than or equal to a second threshold value, maintaining the current opening degree of the oil return valve; and if the liquid level height is smaller than a second threshold value, increasing the current opening degree of the oil return valve, wherein the first threshold value is larger than the second threshold value.
Optionally, the operating parameter is a pressure difference between the exhaust passage and the oil separator, and controlling the opening degree of the oil return valve based on the operating parameter includes: if the differential pressure is greater than or equal to a third threshold value, adjusting the current opening of the oil return valve to 0; if the differential pressure is smaller than a third threshold value and larger than or equal to a fourth threshold value, adjusting the current opening of the oil return valve to be a first opening; if the differential pressure is smaller than a fourth threshold value and larger than or equal to a fifth threshold value, adjusting the current opening of the oil return valve to be a second opening; and if the pressure difference is smaller than a fifth threshold, adjusting the current opening of the oil return valve to be the maximum opening, wherein the third threshold is larger than the fourth threshold, the fourth threshold is larger than the fifth threshold, and the second opening is larger than the first opening.
Optionally, the operating parameter is a frequency of the compressor, and controlling the opening of the oil return valve based on the operating parameter includes: if the frequency is greater than or equal to a sixth threshold value, adjusting the current opening of the oil return valve to 0; if the frequency is smaller than a sixth threshold and larger than or equal to a seventh threshold, adjusting the current opening of the oil return valve to a third opening; if the frequency is smaller than a seventh threshold value and larger than or equal to an eighth threshold value, adjusting the current opening of the oil return valve to be a fourth opening; if the frequency is smaller than an eighth threshold value, the current opening degree of the oil return valve is adjusted to be the maximum opening degree, wherein the sixth threshold value is larger than the seventh threshold value, the seventh threshold value is larger than the eighth threshold value, and the fourth opening degree is larger than the third opening degree.
According to a further embodiment of the present invention, there is also provided a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the above embodiments when executed.
According to yet another embodiment of the present invention, there is also provided an electronic device, including a memory and a processor, the memory having a computer program stored therein, the processor being configured to execute the computer program to perform the steps in any of the above embodiments.
By adopting the oil return system, the oil separator separates the refrigeration oil and the refrigerant, one end of the oil return pipeline is connected with the oil separator, the other end of the oil return pipeline is connected with the high-speed flow passage of the high-pressure cavity of the compressor, for flowing the frozen oil from the oil separator into the high-pressure chamber by a pressure difference between an exhaust passage in the high-pressure chamber and the oil separator, in the oil separator, the refrigerant realizes the separation of the refrigerant oil and the refrigerant, the refrigerant is discharged from an exhaust pipeline of the oil separator, the refrigerant oil flows into a high-pressure cavity of the compressor from an oil return pipeline by utilizing the pressure difference formed by the low static pressure of an exhaust passage and the pressure of the oil separator, the oil return is realized, the technical problem of low volumetric efficiency of the compressor in the related technology is solved, the independence of an oil return port and an air suction port is realized, the effective air suction volume of the compressor is improved, the volumetric efficiency is increased, and the operation efficiency of the whole machine is further improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a block diagram of an oil return system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a high pressure oil supply circuit according to an embodiment of the present invention;
FIG. 3 is a schematic view of another high-pressure oil supply passage according to the embodiment of the present invention;
FIG. 4 is a schematic view of another high-pressure oil supply passage according to the embodiment of the present invention;
FIG. 5 is a schematic flow chart of example one of the present invention;
FIG. 6 is a schematic flow chart of example two of the present invention;
FIG. 7 is a schematic flow diagram of example three of the present invention;
fig. 8 is a flowchart of a control method of an oil return system according to an embodiment of the invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
In this embodiment, an oil return system is provided, and fig. 1 is a structural diagram of an oil return system according to an embodiment of the present invention, and as shown in fig. 1, the structure of the oil return system includes:
an oil separator 10 for separating refrigerant oil and refrigerant;
and the oil return pipeline 12 is connected to the oil separator at one end and connected to a high-speed flow passage of a high-pressure cavity of the compressor at one end, and is used for utilizing the pressure difference between an exhaust passage in the high-pressure cavity and the oil separator to enable the refrigeration oil to flow into the high-pressure cavity from the oil separator.
The compressor of this embodiment includes oil return pipeline, exhaust pipe way, suction line, and oil return pipeline connects in the high-speed runner in compressor high pressure chamber.
One side of the oil return pipeline is connected to the oil separator, and the other side of the oil return pipeline is connected to the vicinity of a high-speed flow passage of a high-pressure cavity of the compressor. The refrigerant enters the scroll from the air suction pipeline of the compressor, enters the high-pressure cavity from the air outlet of the scroll after being compressed, and then enters the oil separator from the air exhaust pipeline of the compressor.
By adopting the oil return system, the oil separator separates the refrigeration oil and the refrigerant, one end of the oil return pipeline is connected with the oil separator, the other end of the oil return pipeline is connected with the high-speed flow passage of the high-pressure cavity of the compressor, for flowing the frozen oil from the oil separator into the high-pressure chamber by a pressure difference between an exhaust passage in the high-pressure chamber and the oil separator, in the oil separator, the refrigerant realizes the separation of the refrigerant oil and the refrigerant, the refrigerant is discharged from an exhaust pipeline of the oil separator, the refrigerant oil flows into a high-pressure cavity of the compressor from an oil return pipeline by utilizing the pressure difference formed by the low static pressure of an exhaust passage and the pressure of the oil separator, the oil return is realized, the technical problem of low volumetric efficiency of the compressor in the related technology is solved, the independence of an oil return port and an air suction port is realized, the effective air suction volume of the compressor is improved, the volumetric efficiency is increased, and the operation efficiency of the whole machine is further improved.
Fig. 2 is a schematic diagram of a high-pressure oil supply path according to an embodiment of the present invention, including: an air intake line 1; a scroll 2; a compressor discharge line 3; an oil separator exhaust line 4; an oil separator 5; an oil return line 6; a motor 7; an exhaust passage 8.
Optionally, the oil return system of the oil return system further includes: and the one-way valve is connected to the first outlet of the oil return pipeline and used for limiting the one-way flow of the refrigeration oil from the oil separator into the high-pressure cavity.
Through increasing the check valve at the oil return pipeline, the refrigerant that the refrigerant can't form the negative pressure when the exhaust passage velocity of flow is low and lead to can effectively prevent to increase gets into oil separator by the check valve.
Fig. 3 is a schematic diagram of another high-pressure oil supply path according to an embodiment of the present invention, including: an air intake line 1; a scroll 2; a compressor discharge line 3; an oil separator exhaust line 4; an oil separator 5; an oil return line 6; a motor 7; an exhaust passage 8; a one-way valve 9.
Optionally, the oil return system further includes: and the oil return valve is connected to a second outlet of the oil return pipeline and is used for enabling the refrigeration oil to flow into the air suction pipeline from the oil separator. In one example, the second outlet is at the rear end of the first outlet, and the separated refrigerant oil flows through the first outlet in the oil return line, the discharge portion is connected to the high-speed flow passage, and then flows through the second outlet to discharge the refrigerant oil to the suction line.
On the basis of the above embodiment, the oil return pipeline is additionally provided with a parallel branch, one end of the parallel branch is connected to the oil return pipeline, and the other end of the parallel branch is connected to the air suction pipeline. The added parallel branch and the oil quantity controllable oil return valve can enable the refrigeration oil to enter the air suction pipeline, and the flow is adjustable, so that the insufficient supply of the refrigeration oil quantity caused by the fact that the oil separator and the exhaust passage cannot form effective pressure difference can be effectively prevented.
Fig. 4 is a schematic diagram of another high-pressure oil supply path according to an embodiment of the present invention, including: an air intake line 1; a scroll 2; a compressor discharge line 3; an oil separator exhaust line 4; an oil separator 5; an oil return line 6; a motor 7; an exhaust passage 8; a check valve 9; the oil quantity can be controlled and the oil return valve 10 can be used.
The oil return valve in this embodiment is an oil return valve that controls the amount of oil (flow or flow rate) by controlling the opening degree, and can be controlled based on various operating parameters of the compressor, and the following examples are given by way of example:
example one: the oil return system further comprises: the first detection module is used for detecting the liquid level height of a refrigerating oil pool at the bottom of the compressor according to a period; and the first control module is used for controlling the opening of the oil return valve based on the liquid level height.
In an example of this example, the first control module is specifically configured to: if the liquid level height is larger than or equal to a first threshold value, reducing the current opening degree of the oil return valve; if the liquid level height is smaller than a first threshold value and larger than or equal to a second threshold value, maintaining the current opening degree of the oil return valve; and if the liquid level height is smaller than a second threshold value, increasing the current opening degree of the oil return valve, wherein the first threshold value is larger than the second threshold value.
FIG. 5 is a schematic flow chart of example one of the present invention, including:
step S51, detecting the liquid level height h of the bottom refrigerating oil pool of the compressor at intervals of t seconds;
step S52, detecting the current opening x of the oil return valve with controllable oil quantity0pls；
Step S53, when h is larger than or equal to f1In time, the opening x of the oil quantity-controllable oil return valve0＝x0-xppls；
Step S54, when f1>h≥f2When the opening degree of the oil quantity controllable oil return valve is maintained, the current opening degree is maintained;
step S55, when f2>h time, the opening x of the oil return valve with controllable oil quantity0＝x0+xppls。
Wherein f is1>f2。
In one implementation scenario, when the controllable oil volume return valve is an electronic expansion valve of 480pls, xp may be 10pls, 20pls, or 50 pls; when the controllable oil amount return valve is an electronic expansion valve of 3000pls, xp can be 60pls, 120pls, 300 pls.
Example two: the oil return system further comprises: the second detection module is used for periodically detecting the pressure difference between the exhaust passage and the oil separator; and the second control module is used for controlling the opening of the oil return valve based on the pressure difference.
In an example of this example, the second control module is specifically configured to: if the differential pressure is greater than or equal to a third threshold value, adjusting the current opening of the oil return valve to 0; if the differential pressure is smaller than a third threshold value and larger than or equal to a fourth threshold value, adjusting the current opening of the oil return valve to be a first opening; if the differential pressure is smaller than a fourth threshold value and larger than or equal to a fifth threshold value, adjusting the current opening of the oil return valve to be a second opening; and if the pressure difference is smaller than a fifth threshold, adjusting the current opening of the oil return valve to be the maximum opening, wherein the third threshold is larger than the fourth threshold, the fourth threshold is larger than the fifth threshold, and the second opening is larger than the first opening.
FIG. 6 is a schematic flow chart of example two of the present invention, including:
step S61, detecting the compressor exhaust passage pressure p at intervals of t secondslPressure p in the oil separatorh；
Step S62, when p ish–pl≥f1Meanwhile, the opening of the oil quantity return valve can be controlled to be 0 pls;
step S63, when f1>ph–pl≥f2In time, the opening x of the oil quantity-controllable oil return valve1pls；
Step S64, when f2>ph–pl≥f3Time, controllable oil quantity oil return valveOpening x2pls；
Step S65, when f3>ph–plIn time, the maximum x of the opening degree of the oil return valve with controllable oil quantitymaxpls。
Wherein f is1>f2>f3，xmax>x2>x1。
In one implementation scenario, f1Is 1000kpa, f2600kPa, f3Is 400 kPa. When the oil quantity controllable oil return valve is a 480pls electronic expansion valve, x1Is 150pls, x2250 pls; when the oil return valve with controllable oil quantity is 3000pls electronic expansion valve, x1Is 900pls, x2Is 1500 pls.
Example three: the oil return system further comprises: the third detection module is used for detecting the frequency of the compressor according to a period; and the third control module is used for controlling the opening of the oil return valve based on the frequency.
In an example of this example, the third control module is specifically configured to: if the frequency is greater than or equal to a sixth threshold value, adjusting the current opening of the oil return valve to 0; if the frequency is smaller than a sixth threshold and larger than or equal to a seventh threshold, adjusting the current opening of the oil return valve to a third opening; if the frequency is smaller than a seventh threshold value and larger than or equal to an eighth threshold value, adjusting the current opening of the oil return valve to be a fourth opening; if the frequency is smaller than an eighth threshold value, the current opening degree of the oil return valve is adjusted to be the maximum opening degree, wherein the sixth threshold value is larger than the seventh threshold value, the seventh threshold value is larger than the eighth threshold value, and the fourth opening degree is larger than the third opening degree.
FIG. 7 is a schematic flow diagram of example three of the present invention, including:
step S71, detecting the frequency F of the compressor at intervals of t seconds;
step S72, when F is larger than or equal to F1Meanwhile, the opening of the oil quantity return valve can be controlled to be 0 pls;
step S73, when f1>F≥f2In time, the opening x of the oil quantity-controllable oil return valve1pls；
Step S74, whenf2>F≥f3In time, the opening x of the oil quantity-controllable oil return valve2pls；
Step S75, when f3>F, the maximum opening x of the oil return valve with controllable oil quantitymaxpls。
Wherein f is1>f2>f3，xmax>x2>x1。
In this embodiment, an air conditioner or other equipment using a compressor for cooling is provided, which includes: an oil return system as described in the previous embodiments.
In this embodiment, a method for controlling an oil return system is provided, and fig. 8 is a flowchart of a method for controlling an oil return system according to an embodiment of the present invention, as shown in fig. 8, including:
s802, detecting the operation parameters of the compressor according to the period;
and S804, controlling the opening of an oil return valve based on the operation parameters, wherein the oil return valve is connected to the outlet of the oil return pipeline and is used for enabling the refrigeration oil to flow into the suction pipeline from the oil separator.
The specific control mode is as shown in the above examples one to three, and the opening degree of the oil return valve can be controlled according to the operation parameters such as the liquid level height of the refrigeration oil pool at the bottom of the compressor, the pressure difference between the exhaust passage and the oil separator, the frequency of the compressor and the like. Here, an example is given:
in an embodiment of this embodiment, the operating parameter is a liquid level of a refrigerant oil pool at the bottom of the compressor, and controlling the opening degree of the oil return valve based on the operating parameter includes: if the liquid level height is larger than or equal to a first threshold value, reducing the current opening degree of the oil return valve; if the liquid level height is smaller than a first threshold value and larger than or equal to a second threshold value, maintaining the current opening degree of the oil return valve; and if the liquid level height is smaller than a second threshold value, increasing the current opening degree of the oil return valve, wherein the first threshold value is larger than the second threshold value.
In one embodiment of this embodiment, the operating parameter is a pressure difference between an exhaust passage and the oil separator, and the controlling the opening degree of the oil return valve based on the operating parameter includes: if the differential pressure is greater than or equal to a third threshold value, adjusting the current opening of the oil return valve to 0; if the differential pressure is smaller than a third threshold value and larger than or equal to a fourth threshold value, adjusting the current opening of the oil return valve to be a first opening; if the differential pressure is smaller than a fourth threshold value and larger than or equal to a fifth threshold value, adjusting the current opening of the oil return valve to be a second opening; and if the pressure difference is smaller than a fifth threshold, adjusting the current opening of the oil return valve to be the maximum opening, wherein the third threshold is larger than the fourth threshold, the fourth threshold is larger than the fifth threshold, and the second opening is larger than the first opening.
In an embodiment of this embodiment, the operating parameter is a frequency of the compressor, and controlling the opening degree of the oil return valve based on the operating parameter includes: if the frequency is greater than or equal to a sixth threshold value, adjusting the current opening of the oil return valve to 0; if the frequency is smaller than a sixth threshold and larger than or equal to a seventh threshold, adjusting the current opening of the oil return valve to a third opening; if the frequency is smaller than a seventh threshold value and larger than or equal to an eighth threshold value, adjusting the current opening of the oil return valve to be a fourth opening; if the frequency is smaller than an eighth threshold value, the current opening degree of the oil return valve is adjusted to be the maximum opening degree, wherein the sixth threshold value is larger than the seventh threshold value, the seventh threshold value is larger than the eighth threshold value, and the fourth opening degree is larger than the third opening degree.
The embodiment provides an oil path and a control mode for directly utilizing high-pressure oil supply and a compressor, and refrigerating machine oil separated by an oil separator directly returns to a high-pressure cavity of the compressor. The outlet of the oil return pipeline is connected to a high-speed flow passage in the compressor, and the circulation of the refrigerating machine oil is realized by utilizing the low static pressure formed by the high-speed flow of the fluid at the high-speed flow passage. Furthermore, the oil return pipeline is additionally provided with a one-way valve, the flow direction is that the oil separator flows towards the inside of the compressor, and the phenomenon that oil flows backwards due to the fact that negative pressure cannot be formed when the flow speed at the high-speed flow port is low is avoided. And furthermore, a controllable oil quantity oil return valve is additionally arranged, one end of the oil return valve is connected with an oil return pipeline, the other end of the oil return valve is connected to a low-pressure air suction pipe of the compressor, and when the system detects that the efficiency or the reliability of the compressor is ensured by returning oil from a low-pressure air suction port, the oil return valve is opened and the flow is adjusted as required. The refrigerant entering the scroll plate contains the refrigeration oil through the oil return of the low-pressure air pipe, the effective air suction volume of the compressor is reduced, and the volume efficiency is reduced. The independence of the oil return port and the air suction port is realized, the effective air suction volume of the compressor is improved, and the volume efficiency is increased.
Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
Example 2
Embodiments of the present invention also provide a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.
Alternatively, in an aspect of the present embodiment, the storage medium may be configured to store a computer program for executing the steps of:
s1, detecting the operation parameters of the compressor according to the period;
and S2, controlling the opening of the oil return valve based on the operation parameters, wherein the oil return valve is connected to the outlet of the oil return pipeline and is used for enabling the refrigeration oil to flow into the air suction pipeline from the oil separator.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Embodiments of the present invention also provide an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the steps of any of the above method embodiments.
Optionally, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.
Optionally, in an aspect of this embodiment, the processor may be configured to execute the following steps by a computer program:
s1, detecting the operation parameters of the compressor according to the period;
and S2, controlling the opening of the oil return valve based on the operation parameters, wherein the oil return valve is connected to the outlet of the oil return pipeline and is used for enabling the refrigeration oil to flow into the air suction pipeline from the oil separator.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. An oil return system, comprising:
the oil separator is used for separating the refrigeration oil and the refrigerant;
the oil return pipeline is connected with the oil separator at one end and connected with a high-speed flow passage of a high-pressure cavity of the compressor at one end, and is used for utilizing the pressure difference between an exhaust passage in the high-pressure cavity and the oil separator to enable the refrigeration oil to flow into the high-pressure cavity from the oil separator;
and the one-way valve is connected to the first outlet of the oil return pipeline and used for limiting the one-way flow of the refrigeration oil from the oil separator into the high-pressure cavity.
2. The oil return system of claim 1, further comprising:
and the oil return valve is connected to a second outlet of the oil return pipeline and is used for enabling the refrigeration oil to flow into the air suction pipeline from the oil separator.
3. The oil return system of claim 2, further comprising:
the first detection module is used for detecting the liquid level height of a refrigerating oil pool at the bottom of the compressor according to a period;
and the first control module is used for controlling the opening of the oil return valve based on the liquid level height.
4. The oil return system of claim 3, wherein the first control module is specifically configured to: if the liquid level height is larger than or equal to a first threshold value, reducing the current opening degree of the oil return valve; if the liquid level height is smaller than a first threshold value and larger than or equal to a second threshold value, maintaining the current opening degree of the oil return valve; and if the liquid level height is smaller than a second threshold value, increasing the current opening degree of the oil return valve, wherein the first threshold value is larger than the second threshold value.
5. The oil return system of claim 2, further comprising:
the second detection module is used for periodically detecting the pressure difference between the exhaust passage and the oil separator;
and the second control module is used for controlling the opening of the oil return valve based on the pressure difference.
6. The oil return system of claim 5, wherein the second control module is specifically configured to: if the differential pressure is greater than or equal to a third threshold value, adjusting the current opening of the oil return valve to 0; if the differential pressure is smaller than a third threshold value and larger than or equal to a fourth threshold value, adjusting the current opening of the oil return valve to be a first opening; if the differential pressure is smaller than a fourth threshold value and larger than or equal to a fifth threshold value, adjusting the current opening of the oil return valve to be a second opening; and if the pressure difference is smaller than a fifth threshold, adjusting the current opening of the oil return valve to be the maximum opening, wherein the third threshold is larger than the fourth threshold, the fourth threshold is larger than the fifth threshold, and the second opening is larger than the first opening.
7. The oil return system of claim 2, further comprising:
the third detection module is used for detecting the frequency of the compressor according to a period;
and the third control module is used for controlling the opening of the oil return valve based on the frequency.
8. The oil return system of claim 7, wherein the third control module is specifically configured to: if the frequency is greater than or equal to a sixth threshold value, adjusting the current opening of the oil return valve to 0; if the frequency is smaller than a sixth threshold and larger than or equal to a seventh threshold, adjusting the current opening of the oil return valve to a third opening; if the frequency is smaller than a seventh threshold value and larger than or equal to an eighth threshold value, adjusting the current opening of the oil return valve to be a fourth opening; if the frequency is smaller than an eighth threshold value, the current opening degree of the oil return valve is adjusted to be the maximum opening degree, wherein the sixth threshold value is larger than the seventh threshold value, the seventh threshold value is larger than the eighth threshold value, and the fourth opening degree is larger than the third opening degree.
9. The oil return system of any one of claims 2 to 8 wherein the second outlet is at a flow-back end of the first outlet.
10. An air conditioner, comprising: the oil return system of any one of claims 1 to 9.
11. A control method of an oil return system is characterized by comprising the following steps:
detecting an operating parameter of the compressor according to a period;
controlling the opening of an oil return valve based on the operation parameters, wherein the oil return valve is connected to a second outlet of an oil return pipeline and is used for enabling the refrigeration oil to flow into an air suction pipeline from the oil separator; one end of the oil return pipeline is connected to the oil separator, and the other end of the oil return pipeline is connected to a high-speed flow passage of a high-pressure cavity of the compressor and used for enabling the refrigeration oil to flow into the high-pressure cavity from the oil separator by utilizing the pressure difference between an exhaust passage in the high-pressure cavity and the oil separator; and a first outlet of the oil return pipeline is connected with a one-way valve and is used for limiting the one-way flow of the refrigeration oil from the oil separator into the high-pressure cavity.
12. The method of claim 11, wherein the operating parameter is a level of a refrigerant sump at a bottom of the compressor, and wherein controlling the opening of the oil return valve based on the operating parameter comprises:
if the liquid level height is larger than or equal to a first threshold value, reducing the current opening degree of the oil return valve; if the liquid level height is smaller than a first threshold value and larger than or equal to a second threshold value, maintaining the current opening degree of the oil return valve; and if the liquid level height is smaller than a second threshold value, increasing the current opening degree of the oil return valve, wherein the first threshold value is larger than the second threshold value.
13. The method of claim 11, wherein the operating parameter is a pressure differential of a vent passage and the oil separator, and controlling the opening of the oil return valve based on the operating parameter comprises:
if the differential pressure is greater than or equal to a third threshold value, adjusting the current opening of the oil return valve to 0; if the differential pressure is smaller than a third threshold value and larger than or equal to a fourth threshold value, adjusting the current opening of the oil return valve to be a first opening; if the differential pressure is smaller than a fourth threshold value and larger than or equal to a fifth threshold value, adjusting the current opening of the oil return valve to be a second opening; and if the pressure difference is smaller than a fifth threshold, adjusting the current opening of the oil return valve to be the maximum opening, wherein the third threshold is larger than the fourth threshold, the fourth threshold is larger than the fifth threshold, and the second opening is larger than the first opening.
14. The method of claim 11, wherein the operating parameter is a frequency of the compressor, and wherein controlling the opening of the oil return valve based on the operating parameter comprises:
if the frequency is greater than or equal to a sixth threshold value, adjusting the current opening of the oil return valve to 0; if the frequency is smaller than a sixth threshold and larger than or equal to a seventh threshold, adjusting the current opening of the oil return valve to a third opening; if the frequency is smaller than a seventh threshold value and larger than or equal to an eighth threshold value, adjusting the current opening of the oil return valve to be a fourth opening; if the frequency is smaller than an eighth threshold value, the current opening degree of the oil return valve is adjusted to be the maximum opening degree, wherein the sixth threshold value is larger than the seventh threshold value, the seventh threshold value is larger than the eighth threshold value, and the fourth opening degree is larger than the third opening degree.
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| CN112629076A (en) | 2021-04-09 |
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