CN110779242B - Injection oil return structure and water chilling unit - Google Patents
Injection oil return structure and water chilling unit Download PDFInfo
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- CN110779242B CN110779242B CN201911053489.8A CN201911053489A CN110779242B CN 110779242 B CN110779242 B CN 110779242B CN 201911053489 A CN201911053489 A CN 201911053489A CN 110779242 B CN110779242 B CN 110779242B
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- stabilizer
- oil return
- evaporator
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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
- 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
- F25B2500/00—Problems to be solved
- F25B2500/16—Lubrication
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention provides an injection oil return structure and a water chilling unit, relates to the technical field of air conditioner oil return devices, and solves the technical problems that in the prior art, when the unit is shut down, the liquid level fluctuation in an evaporator is large, so that the detection of a liquid level sensor is not accurate, and the occurrence probability of the condition that the injection oil return structure is empty and liquid cannot be taken is relatively high. The injection oil return structure comprises a liquid stabilizer, wherein a liquid taking port on the liquid stabilizer is connected with the injector, the liquid stabilizer is communicated with the evaporator, and liquid in the evaporator can flow to the liquid stabilizer after the fluctuation reduction treatment. The invention is used for extracting the lubricating oil on the upper layer of the liquid surface of the refrigerant in the evaporator.
Description
Technical Field
The invention relates to the technical field of air conditioner oil return devices, in particular to an injection oil return structure for an evaporator and a water chilling unit with the injection oil return structure.
Background
During the operation of the water chilling unit, a large amount of heat is generated by friction of bearings, speed-increasing gears and the like, and the heat needs to be lubricated by lubricating oil and taken away by circulating the lubricating oil; in this process, a small portion of the lubricant will leak into the refrigerant system due to the efficiency of the sealing device; in addition, when the centrifugal compressor works, the mechanical motion (such as oil pump liquid stirring, rotor motion, gear meshing motion and the like) and the high-pressure gas of the gas seal continuously increase the gas pressure in the compressor, and the high-pressure gas needs to be communicated with the inside and the outside of the compressor through structures such as a connecting pipe and the like so as to balance the internal gas pressure. However, when the internal refrigerant gas passes through the connecting pipe, the gas-state lubricating oil is carried, so that the lubricating oil flows to the outside of the compressor, namely, the phenomenon of oil leakage occurs. On one hand, the phenomenon of oil leakage causes the air suction and liquid carrying of the unit and damages the service life of the impeller; on the other hand, the liquid level of the lubricating oil is reduced, so that parts such as bearings and the like cannot be sufficiently lubricated, and the abrasion is accelerated. Therefore, it is necessary to recover the lubricant leaked into the refrigerant system.
Experiments show that most of leaked lubricating oil floats on the upper layer of the refrigerant liquid surface of the evaporator, so that the liquid surface (the upper layer of the refrigerant of the evaporator) with the highest oil content needs to be taken out for separation and purification and is led back to the oil tank to recycle the lubricating oil in a refrigerant system.
The conventional liquid taking mode is that a plurality of fixed liquid taking ports (shown in figure 1) are formed in an evaporator cylinder, and then an ejector is used for ejecting an oil return tank or ejecting the oil return tank after being purified by an ejector and returning to a compressor; in practice, however, the liquid level in the evaporator is not fixed and unchanged, the liquid level can be different according to the operating condition of unit and the height is different, and after the liquid level was less than and gets the liquid mouth, it will inhale empty to get liquid, and then can not get liquid, causes to draw and penetrates the oil return failure, for example, there are 3 different liquid mouths of getting in figure 1.
Another conventional liquid taking mode is that an oil return port A2, an oil return port B2 and an oil return port C2 are sequentially arranged on one side surface of a flooded evaporator tank from top to bottom, and the oil return port A2, the oil return port B2 and the oil return port C2 are connected to an ejector through electromagnetic valves respectively; a liquid level sensor is connected to one side, provided with an oil return port, outside the flooded evaporator, the bottom end of the liquid level sensor is communicated with the bottom of the flooded evaporator, and the top end of the liquid level sensor is communicated with a gas phase space at the top of the flooded evaporator; the liquid level signal collected by the liquid level sensor is sent to the unit controller to control the start and stop of the three solenoid valves, as shown in fig. 2. In fact, when the unit operates, the liquid level in the evaporator is boiling, and the fluctuation is severe, so that the detection of the liquid level sensor is inaccurate, and the detected liquid level is unstable; the workload of judging work of the unit controller is increased, and great challenges are brought to the service lives of the liquid level sensor and the unit controller; meanwhile, because the liquid surface is in a boiling state, when the liquid is taken out and boiling bubbles are taken, the air suction of the injection device is still caused, so that the liquid cannot be taken out, and the injection oil return failure is caused.
The applicant has found that the prior art has at least the following technical problems:
when the unit operates, the liquid level in the evaporimeter is the boiling form, and is undulant serious, leads to level sensor to detect inaccurate, when getting liquid and getting boiling bubble, exists and arouse that injection device inhales empty, lead to not getting the condition of liquid, causes to draw and penetrates the oil return failure.
Disclosure of Invention
The invention aims to provide an injection oil return structure and a water chilling unit, and solves the technical problems that in the prior art, when the unit runs, liquid level fluctuation in an evaporator is large, so that a liquid level sensor is not accurate in detection, and the injection oil return structure is empty in suction and has a relatively high probability of liquid failure. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an injection oil return structure which comprises a liquid stabilizer, wherein a liquid taking port on the liquid stabilizer is connected with an injector, the liquid stabilizer is communicated with an evaporator, and liquid in the evaporator can flow to the liquid stabilizer after fluctuation reduction treatment.
Further, the liquid stabilizer is communicated with the evaporator through a communicating pipe for reducing liquid fluctuation in the evaporator.
Furthermore, a necking structure is arranged on the communicating pipe, and the cross sectional area of the necking structure is smaller than that of other sections of the communicating pipe except the necking structure.
Furthermore, at least one necking structure is arranged on the same communicating pipe.
Furthermore, the number of the communicating pipes is multiple and the communicating pipes are distributed between the liquid stabilizer and the evaporator along the height direction of the liquid in the evaporator.
Further, a plurality of the communicating pipes are distributed between the liquid stabilizer and the evaporator at equal intervals.
Furthermore, the number of the liquid taking ports is at least two, and the liquid taking ports are distributed on the liquid stabilizer along the height direction of liquid in the liquid stabilizer.
Furthermore, the number of the liquid taking ports is three, and the liquid taking ports are uniformly distributed on the liquid stabilizer at intervals along the height direction of liquid in the liquid stabilizer.
Further, a liquid level sensor is arranged in the liquid stabilizer; each liquid taking port is connected with the ejector through a liquid outlet pipeline, and an electromagnetic valve is arranged on the liquid outlet pipeline; the electromagnetic valve and the liquid level sensor are connected with a controller; when a liquid level signal acquired by the liquid level sensor is transmitted to the controller, the controller at least controls the electromagnetic valve which is adjacent to the liquid level in the liquid stabilizer and is positioned below the liquid level in the liquid stabilizer to be in an open state.
A water chilling unit comprises the injection oil return structure.
According to the injection oil return structure, the liquid stabilizer is arranged between the injector and the evaporator, the liquid taking port is formed in the liquid stabilizer, liquid in the evaporator flows to the liquid stabilizer after vibration reduction and filtering, so that liquid level fluctuation in the liquid stabilizer is smaller than liquid level fluctuation in the evaporator, the liquid level in the liquid stabilizer tends to be stable as much as possible, the liquid level sensor can accurately detect the height of the liquid level in the liquid stabilizer, and the technical problems that when a unit operates in the prior art, the liquid level fluctuation in the evaporator is large, the liquid level sensor is not accurate in detection, and the occurrence probability of the situation that the injection oil return structure sucks air and cannot take liquid is relatively high are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an injection oil return structure in the prior art;
FIG. 2 is a schematic structural diagram of another injection oil return structure in the prior art;
fig. 3 is a schematic structural diagram of an injection oil return structure provided in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a communication pipe according to an embodiment of the present invention;
fig. 5 is a table showing the on-off state of the electromagnetic valve of the injection oil return structure according to the liquid level in the liquid stabilizer;
fig. 6 is another table of the injection oil return structure according to the different liquid levels in the liquid stabilizer, showing the on-off state of the electromagnetic valve;
fig. 7 is another table of the injection oil return structure according to the different liquid levels in the liquid stabilizer, showing the on-off state of the electromagnetic valve;
fig. 8 is another table showing the on-off state of the electromagnetic valve of the injection oil return structure according to the liquid level in the liquid stabilizer according to the embodiment of the invention.
FIG. 1-liquid stabilizer; 2-a liquid level sensor; 3-an ejector; 4-an evaporator; 5-communicating pipe; 51-a throat structure; 6-liquid outlet pipeline; 7-an electromagnetic valve; 71-a first solenoid valve; 72-a second solenoid valve; 73-third solenoid valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1-4, the invention provides an injection oil return structure, which comprises a liquid stabilizer 1, wherein a liquid taking port on the liquid stabilizer 1 is connected with an injector 3, the liquid stabilizer 1 is communicated with an evaporator 4, and liquid in the evaporator 4 can flow to the liquid stabilizer 1 after being subjected to fluctuation reduction treatment. When the unit operates, the liquid level in the evaporator is boiling, and the fluctuation is severe, so that the detection of the liquid level sensor is not accurate; according to the injection oil return structure provided by the invention, the liquid stabilizer 1 is arranged between the injector 3 and the evaporator 4, the liquid taking port is arranged on the liquid stabilizer 1, liquid in the evaporator 4 flows to the liquid stabilizer 1 after vibration reduction and filtering, so that the fluctuation of the liquid level in the liquid stabilizer 1 is smaller than the fluctuation of the liquid level in the evaporator, the liquid level in the liquid stabilizer 1 tends to be stable as much as possible, the liquid level sensor can accurately detect the height of the liquid level in the liquid stabilizer 1, and further, the condition that the liquid cannot be taken due to the fact that the injector is empty can be reduced as much as possible.
As an optional implementation manner of the embodiment of the present invention, referring to fig. 3 to 4, the liquid stabilizer 1 is communicated with the evaporator 4 through a communicating pipe 5 for reducing liquid fluctuation in the evaporator 4, and the liquid in the evaporator 4 flows to the liquid stabilizer 1 after being subjected to vibration reduction and filtering by the communicating pipe 5; specifically, communication pipe 5 may have a throat structure 51 thereon, and the cross-sectional area of throat structure 51 is smaller than the cross-sectional areas of the sections of communication pipe 5 other than throat structure 51; the diameter of the communicating pipe 5 can be about 20 mm-30 mm, the diameter of the reducing structure 51 can be about 10mm, and the fluctuation of the liquid flowing into the liquid stabilizer 1 can be reduced through the reducing structure 51; the communication pipe 5 may be a straight pipe, at least one necking structure 51 may be disposed along the length direction of the communication pipe 5, and the cross section of the communication pipe 5 may be circular, elliptical, square, or other shapes; the communicating pipe 5 is used for guiding the liquid in the evaporator 4 into the liquid stabilizer 1, and damping and filtering the liquid level, so that the liquid reaching the liquid stabilizer 1 is stable.
As an optional implementation manner of the embodiment of the present invention, referring to fig. 3, the number of the communicating pipes 5 is multiple and is distributed between the liquid stabilizer 1 and the evaporator 4 along the height direction of the liquid in the evaporator 4. A plurality of communicating pipes 5 can be distributed between the liquid stabilizer 1 and the evaporator 4 at equal intervals; a cavity is formed inside the liquid stabilizer 1, a plurality of communicating pipe orifices used for being connected with the communicating pipe 5 are arranged on the liquid stabilizer 1, and the communicating pipe orifices are distributed on the liquid stabilizer 1 at equal intervals.
As an optional implementation manner of the embodiment of the present invention, the number of the liquid taking ports is at least two, and the liquid taking ports are distributed on the liquid stabilizer 1 along the height direction of the liquid in the liquid stabilizer 1; the number of the liquid taking ports can be three (the number of the liquid taking ports can be other numbers), and the three liquid taking ports can be distributed on the liquid stabilizer 1 at equal intervals along the height direction of the liquid in the liquid stabilizer 1. Referring to fig. 3, three liquid taking ports are schematically shown, namely a liquid taking port a, a liquid taking port B and a liquid taking port C, through which liquid in the liquid stabilizer 1 can flow to the ejector 3.
As an optional implementation manner of the embodiment of the invention, a liquid level sensor 2 is arranged in the liquid stabilizer 1; each liquid taking port is respectively connected with the ejector 3 through a liquid outlet pipeline 6, and the liquid outlet pipeline 6 is provided with an electromagnetic valve 7; the electromagnetic valve 7 and the liquid level sensor 2 are both connected with the controller; when the liquid level signal collected by the liquid level sensor 2 is transmitted to the controller, the controller at least controls the electromagnetic valve 7 which is adjacent to the liquid level in the liquid stabilizer 1 and is positioned below the liquid level in the liquid stabilizer 1 to be in an open state.
The liquid level sensor 2 is an electronic component for detecting the liquid level height, the liquid level sensor 2 is inserted into the liquid stabilizer 1 to detect the liquid level height in the liquid stabilizer 1, and the acquired liquid level signal is sent to the unit controller to control the starting and stopping of the electromagnetic valve 7 on the liquid outlet pipeline 6; the electromagnetic valve is a component and can be controlled to be on and off through an electric signal, the inlet end of the electromagnetic valve 7 is communicated with a corresponding liquid taking port of the liquid stabilizer 1, the outlet end (after being converged) is communicated with the ejector 3, referring to fig. 3, three liquid taking ports on the liquid stabilizer 1 are shown, and the liquid outlet pipeline 6 communicated with each liquid taking port is respectively provided with the electromagnetic valve 7; the ejector is provided with 3 ports which are respectively an inlet end, an outlet end and an inlet end; the inlet end of the ejector is communicated with high-pressure air of the condenser to provide ejection power, the outlet end of the ejector is communicated with the low-pressure end of an oil tank or an air suction port of the compressor, and the leading-in end of the ejector is connected with the outlet end of the electromagnetic valve 7.
Example 1:
an injection oil return structure comprises a liquid stabilizer 1, wherein the liquid stabilizer 1 is communicated with an evaporator 4 through a communicating pipe 5, a necking structure 51 is arranged on the communicating pipe 5, and the communicating pipes 5 are distributed between the liquid stabilizer 1 and the evaporator 4 at equal intervals; the liquid taking ports on the liquid stabilizer 1 are connected with the ejector 3, the number of the liquid taking ports is three, and the liquid taking ports are distributed on the liquid stabilizer 1 at equal intervals along the height direction of liquid in the liquid stabilizer 1; each liquid taking port is respectively connected with the ejector 3 through a liquid outlet pipeline 6, and the liquid outlet pipeline 6 is provided with an electromagnetic valve 7; a liquid level sensor 2 is arranged in the liquid stabilizer 1; the electromagnetic valve 7 and the liquid level sensor 2 are both connected with the controller; when the liquid level signal collected by the liquid level sensor 2 is transmitted to the controller, the controller controls the on-off of the electromagnetic valve 7 according to the liquid level signal.
Example 2:
a chiller including the injection oil return structure described in embodiment 1.
Example 3:
when the unit is operated, the liquid level in the evaporator 4 is different according to different working conditions of the unit, and for the injection oil return structure in embodiment 1, the on-off condition of the unit controller controlling the electromagnetic valve 7 may be as follows:
referring to fig. 5, when the liquid level sensor 2 detects that the liquid level in the liquid stabilizer 1 is located between the liquid taking port a and the liquid taking port B, the first electromagnetic valve 71 is opened, the states of the second electromagnetic valve 72 and the third electromagnetic valve 73 are opposite to the state of the first electromagnetic valve 71, the ejector 3 takes liquid from the liquid taking port a, the liquid taking port a is closest to the oil-rich layer, and the liquid taking and oil returning effects from the liquid taking port a are the best;
when the liquid level sensor 2 detects that the liquid level in the liquid stabilizer 1 is positioned between the liquid taking port B and the liquid taking port C, the second electromagnetic valve 72 is opened, the states of the first electromagnetic valve 71, the third electromagnetic valve 73 and the second electromagnetic valve 72 are opposite, the ejector 3 takes liquid from the liquid taking port B, the liquid taking port B is closest to the oil-rich layer, and the liquid taking and oil returning effects from the liquid taking port B are the best;
when the liquid level sensor 2 detects that the liquid level in the liquid stabilizer 1 is above the liquid taking port C (including the position C), the third electromagnetic valve 73 is opened, the states of the first electromagnetic valve 71, the second electromagnetic valve 72 and the third electromagnetic valve 73 are opposite, the ejector 3 takes liquid from the liquid taking port C, the liquid taking port C is closest to the oil-rich layer, and the liquid taking and oil returning effects from the liquid taking port C are the best;
and when the liquid level in the liquid stabilizer 1 is below the liquid taking port A, the unit is abnormally alarmed and stopped.
Example 4:
when the unit is operated, the liquid level in the evaporator 4 is different according to different working conditions of the unit, and for the injection oil return structure in the embodiment 1, the on-off condition of the unit controller controlling the electromagnetic valve 7 may be as follows:
referring to fig. 6, when the liquid level sensor 2 detects that the liquid level in the liquid stabilizer 1 is located between the liquid taking port a and the liquid taking port B, the first electromagnetic valve 71 is opened, and the states of the second electromagnetic valve 72 and the third electromagnetic valve 73 are opposite to the state of the first electromagnetic valve 71;
when the liquid level sensor 2 detects that the liquid level in the liquid stabilizer 1 is positioned between the liquid taking port B and the liquid taking port C, the first electromagnetic valve 71 and the second electromagnetic valve 72 are opened, and the third electromagnetic valve 73 and the second electromagnetic valve 72 are in opposite states;
when the liquid level sensor 2 detects that the liquid level in the liquid stabilizer 1 is above the liquid taking port C (including the position C), the first electromagnetic valve 71, the second electromagnetic valve 72 and the third electromagnetic valve 73 are all opened;
and when the liquid level in the liquid stabilizer 1 is below the liquid taking port A, the unit is abnormally alarmed and stopped.
Example 5:
when the unit is operated, the liquid level in the evaporator 4 is different according to different working conditions of the unit, and for the injection oil return structure in the embodiment 1, the on-off condition of the unit controller controlling the electromagnetic valve 7 may be as follows:
referring to fig. 7, when the liquid level sensor 2 detects that the liquid level in the liquid stabilizer 1 is located between the liquid taking port a and the liquid taking port B, the first electromagnetic valve 71 is opened, and the states of the second electromagnetic valve 72 and the third electromagnetic valve 73 are opposite to the state of the first electromagnetic valve 71;
when the liquid level sensor 2 detects that the liquid level in the liquid stabilizer 1 is positioned between the liquid taking port B and the liquid taking port C, the first electromagnetic valve 71 and the second electromagnetic valve 72 are opened, and the third electromagnetic valve 73 and the second electromagnetic valve 72 are in opposite states;
when the liquid level sensor 2 detects that the liquid level in the liquid stabilizer 1 is higher than the liquid taking port C (including the position C), the first electromagnetic valve 71 and the third electromagnetic valve 73 are opened, and the state of the second electromagnetic valve 72 is opposite to that of the first electromagnetic valve 71;
and when the liquid level in the liquid stabilizer 1 is below the liquid taking port A, the unit is abnormally alarmed and stopped.
Example 6:
when the unit is operated, the liquid level in the evaporator 4 is different according to different working conditions of the unit, and for the injection oil return structure in the embodiment 1, the on-off condition of the unit controller controlling the electromagnetic valve 7 may be as follows:
referring to fig. 8, when the liquid level sensor 2 detects that the liquid level in the liquid stabilizer 1 is located between the liquid taking port a and the liquid taking port B, the first electromagnetic valve 71 is opened, and the states of the second electromagnetic valve 72 and the third electromagnetic valve 73 are opposite to the state of the first electromagnetic valve 71;
when the liquid level sensor 2 detects that the liquid level in the liquid stabilizer 1 is positioned between the liquid taking port B and the liquid taking port C, the first electromagnetic valve 71 and the second electromagnetic valve 72 are opened, and the third electromagnetic valve 73 and the second electromagnetic valve 72 are in opposite states;
when the liquid level sensor 2 detects that the liquid level in the liquid stabilizer 1 is higher than the liquid taking port C (including the position C), the second electromagnetic valve 72 and the third electromagnetic valve 73 are opened, and the states of the first electromagnetic valve 71 and the second electromagnetic valve 72 are opposite;
and when the liquid level in the liquid stabilizer 1 is below the liquid taking port A, the unit is abnormally alarmed and stopped.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. An injection oil return structure is characterized by comprising a liquid stabilizer (1), wherein,
the liquid taking port on the liquid stabilizer (1) is connected with the ejector (3), the liquid stabilizer (1) is communicated with the evaporator (4), and liquid in the evaporator (4) can flow to the liquid stabilizer (1) after the fluctuation reduction treatment.
2. The injection oil return structure according to claim 1, wherein the liquid stabilizer (1) is communicated with the evaporator (4) through a communicating pipe (5) for reducing liquid fluctuation in the evaporator (4).
3. The injection oil return structure according to claim 2, wherein a throat structure (51) is provided on the communication pipe (5), and a cross-sectional area of the throat structure (51) is smaller than cross-sectional areas of other sections of the communication pipe (5) except for the throat structure (51).
4. The injection oil return structure according to claim 3, wherein at least one of the necking structures (51) is provided on the same communication pipe (5).
5. The injection oil return structure according to any one of claims 2 to 4, wherein the number of the communicating pipes (5) is plural and is distributed between the liquid stabilizer (1) and the evaporator (4) along the height direction of the liquid in the evaporator (4).
6. The injection oil return structure according to claim 5, wherein a plurality of the communicating pipes (5) are distributed at equal intervals between the liquid stabilizer (1) and the evaporator (4).
7. The injection oil return structure according to any one of claims 1 to 4, wherein the number of the liquid taking ports is at least two, and the liquid taking ports are distributed on the liquid stabilizer (1) along the height direction of the liquid in the liquid stabilizer (1).
8. The injection oil return structure according to any one of claims 1 to 4, wherein the number of the liquid taking ports is three, and the liquid taking ports are evenly distributed on the liquid stabilizer (1) at intervals along the height direction of the liquid in the liquid stabilizer (1).
9. The injection oil return structure according to any one of claims 1 to 4, wherein a liquid level sensor (2) is arranged in the liquid stabilizer (1); each liquid taking port is connected with the ejector (3) through a liquid outlet pipeline (6), and an electromagnetic valve (7) is arranged on the liquid outlet pipeline (6); the electromagnetic valve (7) and the liquid level sensor (2) are connected with a controller; when a liquid level signal acquired by the liquid level sensor (2) is transmitted to the controller, the controller at least controls the electromagnetic valve (7) which is adjacent to the liquid level in the liquid stabilizer (1) and is positioned below the liquid level in the liquid stabilizer (1) to be in an open state.
10. A water chilling unit, characterized in that it comprises the injection oil return structure of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911053489.8A CN110779242B (en) | 2019-10-31 | 2019-10-31 | Injection oil return structure and water chilling unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911053489.8A CN110779242B (en) | 2019-10-31 | 2019-10-31 | Injection oil return structure and water chilling unit |
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| CN110779242B true CN110779242B (en) | 2020-09-22 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101633781B1 (en) * | 2010-03-05 | 2016-06-27 | 엘지전자 주식회사 | Chiller |
| JP5563336B2 (en) * | 2010-03-08 | 2014-07-30 | 荏原冷熱システム株式会社 | Lubricating oil recovery device |
| CN104976828A (en) * | 2014-04-01 | 2015-10-14 | 同方人工环境有限公司 | Sea ship flooded evaporator oil return device |
| CN106440538A (en) * | 2016-10-21 | 2017-02-22 | 珠海格力电器股份有限公司 | Flooded evaporator oil return system and water-cooled air conditioning unit adopting flooded evaporator oil return system |
| CN206222747U (en) * | 2016-11-02 | 2017-06-06 | 重庆美的通用制冷设备有限公司 | Handpiece Water Chilling Units |
| CN108286843B (en) * | 2018-04-03 | 2023-10-27 | 珠海格力电器股份有限公司 | Ejector, ejector reflux device and heat pump system |
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