CN110686423A - Air conditioning unit with compressor cooling branch and compressor cooling control method - Google Patents
Air conditioning unit with compressor cooling branch and compressor cooling control method Download PDFInfo
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- CN110686423A CN110686423A CN201911007090.6A CN201911007090A CN110686423A CN 110686423 A CN110686423 A CN 110686423A CN 201911007090 A CN201911007090 A CN 201911007090A CN 110686423 A CN110686423 A CN 110686423A
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- 238000001816 cooling Methods 0.000 title claims abstract description 193
- 238000004378 air conditioning Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000003507 refrigerant Substances 0.000 claims abstract description 68
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 230000001502 supplementing effect Effects 0.000 claims abstract description 9
- 239000013589 supplement Substances 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 description 11
- 239000003921 oil Substances 0.000 description 6
- 239000010687 lubricating oil Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011144 upstream manufacturing 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioners, and particularly provides an air conditioning unit with a compressor cooling branch and a compressor cooling control method. The invention aims to solve the problem that the existing mode for reducing the exhaust temperature of the compressor is poor. Therefore, the air conditioning unit comprises a main circulation loop, and a compressor, an outdoor coil and an indoor coil which are arranged on the main circulation loop, wherein an air supplementing port is arranged on the compressor, and at least one part of a cooling branch of the compressor is attached to the compressor, so that a refrigerant in the cooling branch of the compressor can cool the compressor for the first time outside the compressor; one end of the compressor cooling branch is connected with the air supplementing port, and the other end of the compressor cooling branch is connected with the liquid pipe, so that a refrigerant in the compressor cooling branch can enter the compressor to carry out secondary cooling on the compressor; the invention realizes pre-cooling through primary cooling and further reduces the temperature of the compressor through secondary cooling so as to improve the cooling effect to the maximum extent and ensure the heat exchange efficiency of the air conditioning unit.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides an air conditioning unit with a compressor cooling branch and a compressor cooling control method.
Background
Along with the continuous improvement of living standard of people, people also put forward higher and higher requirements on living environment. In order to maintain a comfortable ambient temperature, air conditioning units have become an essential device in human life. Meanwhile, people also put higher and higher requirements on the heating efficiency of the air conditioning unit; generally, under the condition that the outdoor environment temperature is low, the heating efficiency of the heat pump air conditioning unit is generally low, so that the heat pump air conditioning unit is difficult to meet the heat exchange requirement of a user. Specifically, when the external ambient temperature is low, the evaporation pressure of the air conditioning unit is also low, which results in a large suction specific volume of the compressor, and thus a low output efficiency of the compressor. In order to solve the problems, an air-supplying enthalpy-increasing compressor is developed by an existing compressor manufacturer, and in the air-supplying enthalpy-increasing compression process, a refrigerant can be injected into the air-supplying enthalpy-increasing compressor through an air-supplying enthalpy-increasing port of the compressor so as to increase the refrigerant compression amount of the compressor and improve the heating capacity of the air-conditioning unit. Meanwhile, in the refrigeration process of the air conditioning unit, the air conditioning unit can effectively reduce the exhaust temperature of the compressor by injecting the refrigerant into the compressor through the air supplementing and enthalpy increasing port, so that the reliable operation of internal elements of the compressor is protected. However, under the conditions that the air conditioning unit is in a high-temperature refrigeration or maximum heating working condition and the air conditioning unit is in long-time operation, the problem that the exhaust temperature of the compressor is too high still occurs, and the maintenance of the condition easily causes the problem that components (such as enameled wires) inside the compressor are aged or even damaged, thereby causing the damage of the compressor.
Aiming at the problem of overhigh exhaust temperature of a compressor, the existing air conditioning unit generally adopts the following three solutions: 1. the rotating speed of the fan on the condensation side is increased, so that the heat exchange air quantity on the condensation side is increased, the exhaust temperature of the compressor is reduced in a mode of reducing the condensation temperature, but the increase of the rotating speed of the fan inevitably causes the increase of noise, and the user experience is seriously influenced; 2. the method is characterized in that a branch is arranged on a main pipeline on the liquid pipe side of the outdoor coil pipe, the refrigerant in the branch exchanges heat with the refrigerant in the main pipeline to change the refrigerant into a gas state, and then the gas-supplementing enthalpy-increasing port of the compressor is injected, so that the exhaust temperature is reduced by increasing the refrigerant circulation volume, but the method has limited cooling effect, and even has certain cooling effect only under the condition of insufficient refrigerant circulation volume; 3. the main path is provided with a branch path, and the refrigerant in the main path is directly injected into the compressor through the branch path so as to reduce the exhaust temperature by increasing the amount of the refrigerant sucked by the compressor. When the exhaust temperature of the compressor is not successfully reduced, the air conditioning unit can only control the compressor to operate in a frequency reduction mode, so that the exhaust temperature of the compressor can be reduced by reducing the output power of the compressor; however, this method will seriously affect the heat exchange amount of the air conditioning unit, so that the heat exchange requirement of the user cannot be met.
Accordingly, there is a need in the art for a new air conditioning unit having a compressor cooling branch and a compressor cooling control method to solve the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem of poor mode for reducing the exhaust temperature of the compressor in the prior art, the present invention provides an air conditioning unit with a compressor cooling branch, the air conditioning unit includes a main circulation loop, and a compressor, an outdoor coil and an indoor coil which are arranged on the main circulation loop, an air supplement port is arranged on the compressor, the main circulation loop includes a liquid pipe arranged between the outdoor coil and the indoor coil, at least one part of the compressor cooling branch is attached to the compressor, so that the refrigerant in the compressor cooling branch can perform primary cooling on the compressor outside the compressor, one end of the compressor cooling branch is connected with the air supplement port, and the other end of the compressor cooling branch is connected with the liquid pipe, so that the refrigerant in the compressor cooling branch can enter the compressor to perform secondary cooling on the compressor And (5) secondary cooling.
In the above-mentioned preferred embodiment of the air conditioning unit having the compressor cooling branch, at least a portion of the compressor cooling branch is attached to the compressor in a surrounding manner.
In a preferred embodiment of the air conditioning assembly with a compressor cooling branch, at least a portion of the compressor cooling branch is connected to a housing of the compressor in a fixed connection.
In the above preferred technical solution of the air conditioning unit with the compressor cooling branch, the compressor cooling branch is made of metal, and at least a part of the compressor cooling branch is connected with the shell of the compressor in a welding manner.
In the above preferred technical scheme of the air conditioning unit with the compressor cooling branch, the surrounding direction of the compressor cooling branch is set such that the compressor cooling branch surrounds from bottom to top under the condition that the compressor is installed in place, so that the refrigerant in the compressor cooling branch enters the compressor from bottom to top.
In a preferred embodiment of the air conditioning unit with the compressor cooling branch, the compressor cooling branch is provided with a throttling member.
The invention also provides a compressor cooling control method for an air conditioning unit, the air conditioning unit comprises a main circulation loop, a compressor, an outdoor coil and an indoor coil, the compressor, the outdoor coil and the indoor coil are arranged on the main circulation loop, an air supplement port is arranged on the compressor, the main circulation loop comprises a liquid pipe arranged between the outdoor coil and the indoor coil, at least one part of a compressor cooling branch is attached to the compressor so that the refrigerant in the compressor cooling branch can carry out primary cooling on the compressor outside the compressor, one end of the compressor cooling branch is connected with the air supplement port, the other end of the compressor cooling branch is connected with the liquid pipe so that the refrigerant in the compressor cooling branch can enter the compressor to carry out secondary cooling on the compressor, and a throttling component is arranged on the compressor cooling branch, the compressor cooling control method includes: acquiring the exhaust temperature of the compressor; the open/close state of the throttle member is controlled according to the discharge temperature of the compressor.
In a preferred embodiment of the above method for controlling cooling of a compressor for an air conditioning unit, the step of "controlling an open/close state of the throttle member according to a discharge temperature of the compressor" includes: and if the exhaust temperature of the compressor is greater than the preset exhaust temperature, controlling the throttle member to be opened at a preset initial opening.
In a preferable embodiment of the above method for controlling cooling of a compressor for an air conditioning unit, after the throttle member is opened at the preset initial opening, the method further includes: acquiring the temperature at the outlet of the throttling component and the temperature at the outlet of the cooling branch of the compressor; selectively adjusting an opening of the throttling member based on a temperature at an outlet of the throttling member and a temperature at an outlet of the compressor cooling branch.
In a preferred embodiment of the above method for controlling cooling of a compressor of an air conditioning unit, the step of "selectively adjusting the opening degree of the throttling member according to the temperature at the outlet of the throttling member and the temperature at the outlet of the cooling branch of the compressor" specifically includes: and if the difference between the temperature at the outlet of the cooling branch of the compressor and the temperature at the outlet of the throttling component is larger than the preset temperature difference, increasing the opening degree of the throttling component.
The technical scheme includes that the air conditioning unit comprises a main circulation loop, a compressor, an outdoor coil and an indoor coil, wherein the compressor, the outdoor coil and the indoor coil are arranged on the main circulation loop, an air supplement port is formed in the compressor, the main circulation loop comprises a liquid pipe arranged between the outdoor coil and the indoor coil, at least one part of a cooling branch of the compressor is attached to the compressor, so that a refrigerant in the cooling branch of the compressor can cool the compressor for one time outside the compressor, and the arrangement mode not only can pre-cool the compressor, but also can promote the refrigerant entering the compressor through the cooling branch of the compressor to be converted into a gaseous state so as to further reduce the risk of liquid carrying of the compressor in air suction; one end of the compressor cooling branch is connected with the air supplementing port, the other end of the compressor cooling branch is connected with the liquid pipe, so that the refrigerant in the compressor cooling branch can enter the compressor to carry out secondary cooling on the compressor, namely after the refrigerant in the compressor cooling branch is subjected to primary cooling on the compressor from the outside of the compressor, the refrigerant in the compressor cooling branch can also directly enter the compressor through the air supplementing port so as to carry out secondary cooling on the compressor, and further the cooling effect of the compressor is guaranteed to the maximum extent, so that the exhaust temperature of the compressor is effectively reduced, and the heat exchange efficiency of the air conditioning unit is guaranteed.
Further, in a preferred technical solution of the present invention, at least a portion of the compressor cooling branch in the present invention is attached to the compressor in a surrounding manner, so that the compressor cooling branch can have a larger contact area with the compressor, and thus the compressor cooling branch can perform better primary cooling on the compressor, thereby effectively improving the cooling effect thereof.
Further, in a preferred embodiment of the present invention, at least a portion of the cooling branch of the compressor is connected to the housing of the compressor in a fixed connection manner; it can be understood that, because of the impulse action of the fluid, the cooling branch of the compressor is easy to vibrate in the working process, and in order to effectively avoid the problem of pipeline damage caused by vibration, at least one part of the cooling branch of the compressor is fixedly connected with the shell of the compressor, so that the reliability of the cooling branch of the compressor is effectively ensured. Preferably, the compressor cooling branch is made of metal, and at least a portion of the compressor cooling branch is connected with the shell of the compressor in a welding manner, so that the vibration phenomenon of the compressor cooling branch is avoided to the maximum extent.
Further, in a preferred technical scheme of the present invention, a surrounding direction of a cooling branch of a compressor in the present invention is set such that, when the compressor is installed in place, the cooling branch of the compressor surrounds from bottom to top, so that a refrigerant in the cooling branch of the compressor enters the compressor from bottom to top; it can be understood that, because the refrigerant in the compressor cooling branch is in a gas-liquid mixed state, in order to effectively prevent the liquid refrigerant in the compressor cooling branch from flowing away under the condition that the compressor is not fully cooled, the invention sets the compressor cooling branch to be in a structure surrounding from bottom to top, so that the liquid refrigerant in the compressor cooling branch can flow out after fully exchanging heat with the compressor, thereby further effectively ensuring the pre-cooling effect of the compressor cooling branch.
Further, in a preferred technical scheme of the present invention, a throttling member is disposed on a cooling branch of the compressor, so that the air conditioning unit can control a flow rate of a refrigerant in the cooling branch of the compressor through the throttling member, thereby effectively adapting to different heating conditions of the compressor, and further effectively improving cooling efficiency of the cooling branch of the compressor.
Further, in a preferred embodiment of the present invention, the method for controlling cooling of a compressor according to the present invention can control the open/close state of the throttling member according to the discharge temperature of the compressor, so that the air conditioning unit can control the open/close state of the throttling member according to the heat generation condition of the compressor, thereby performing timely cooling when the compressor needs cooling, and effectively ensuring the amount of refrigerant in the main circulation circuit when the compressor does not need cooling.
Further, in a preferred embodiment of the present invention, if the discharge temperature of the compressor is greater than the preset discharge temperature, it indicates that the compressor has been overheated; at this time, in order to effectively reduce the exhaust temperature of the compressor, the air conditioning unit can control the throttle member to be opened at the preset initial opening degree, so that the exhaust temperature of the compressor is effectively reduced, and the heat exchange efficiency of the air conditioning unit is ensured.
Further, in a preferred technical solution of the present invention, after the throttling element is opened at the preset initial opening, the air conditioning unit may further selectively adjust the opening of the throttling element according to the temperature at the outlet of the throttling element and the temperature at the outlet of the cooling branch of the compressor, so as to effectively ensure that the cooling effect of the cooling branch of the compressor can adapt to the heating degree of the compressor. Preferably, if a difference between the temperature at the outlet of the cooling branch of the compressor and the temperature at the outlet of the throttling member is greater than the preset temperature difference, it indicates that the heating phenomenon of the compressor is relatively serious, and in order to effectively improve the cooling effect of the cooling branch of the compressor so that the cooling effect of the cooling branch of the compressor is adapted to the heating degree of the compressor, the air conditioning unit may increase the opening degree of the throttling member so that the flow rate of the refrigerant in the cooling branch of the compressor is larger, thereby effectively improving the cooling effect of the cooling branch of the compressor, and further effectively reducing the exhaust temperature of the compressor.
Drawings
FIG. 1 is a schematic diagram of the overall configuration of a preferred embodiment of the air conditioning assembly of the present invention having a compressor cooling branch;
fig. 2 is a flowchart illustrating the steps of a preferred embodiment of the cooling control method for a compressor according to the present invention.
Reference numerals: 1. a compressor; 11. an air suction port; 12. an exhaust port; 13. an air supplement port; 2. an oil separator; 3. a capillary tube; 4. a four-way valve; 5. an outdoor coil pipe; 6. a first throttle member; 7. a one-way valve; 8. a gas-liquid separator; 9. an indoor coil pipe; 101. a compressor cooling branch; 102. a second throttling member; 103. an intake air temperature sensor; 104. a gas supply temperature sensor; 105. an exhaust gas temperature sensor.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the steps of the method of the present invention are described herein in a particular order, these orders are not limiting, and one skilled in the art may perform the steps in a different order without departing from the underlying principles of the invention.
It should be noted that in the description of the present invention, unless otherwise explicitly specified or limited, the terms "upper", "lower", "left", "right", "inner", "outer", and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are for convenience of description only, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Also, the terms "coupled," "connected," and "communicating" are to be construed broadly, e.g., as meaning mechanical or electrical communication; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Reference is first made to fig. 1, which is a schematic diagram of the overall structure of a preferred embodiment of the air conditioning assembly with a compressor cooling branch according to the present invention. As shown in fig. 1, the air conditioning unit of the present invention includes a main circulation loop, and a compressor 1, a four-way valve 4, an outdoor coil 5 and an indoor coil 9 which are arranged on the main circulation loop, and the air conditioning unit changes the working condition of the air conditioning unit by controlling the four-way valve 4 to reverse; wherein, the compressor 1 is provided with an air suction port 11, an air exhaust port 12 and an air supplement port 13, a gas-liquid separator 8 is further arranged on a main circulation loop between the air suction port 11 of the compressor 1 and the four-way valve 4, an oil separator 2 is further arranged on the main circulation loop between the air exhaust port 12 of the compressor 1 and the four-way valve 4, and a capillary tube 3 is further arranged between the oil separator 2 and the air suction port 11 of the compressor 1, so that the lubricating oil separated from the oil separator 2 can directly flow back to the compressor 1 through the capillary tube 3. Since the main circulation circuit portion directly connected between the outdoor coil 5 and the indoor coil 9 is usually mainly filled with liquid refrigerant, it is called a liquid pipe, and the first throttling member 6 and the check valve 7 are also provided in parallel on the liquid pipe. It should be noted that, the present invention does not limit the specific structure of the main circulation loop and the elements disposed on the main circulation loop, and the technicians can set the configuration according to the actual use requirements; for example, although the air conditioning unit in the preferred embodiment includes a plurality of indoor units, it is obvious that the air conditioning unit of the present invention may include only one indoor unit, and such specific structural changes do not depart from the basic principle of the present invention and fall within the protection scope of the present invention.
Specifically, the air conditioning unit of the present invention further includes a compressor cooling branch 101, wherein a portion of the compressor cooling branch 101 is attached to the compressor 1, so that the refrigerant in the compressor cooling branch 101 can cool the compressor 1 at a time outside the compressor 1; and the left end of the compressor cooling branch 101 is connected with the air supplement port 13 of the compressor 1, and the right end of the compressor cooling branch 101 is connected with the liquid pipe, so that the refrigerant in the compressor cooling branch 101 can enter the compressor 1 after primary cooling is completed to perform secondary cooling on the compressor 1. In other words, the refrigerant in the compressor cooling branch 101 can cool the compressor 1 once through the pipe wall and the shell of the compressor 1; after the primary cooling is completed, the refrigerant in the compressor cooling branch 101 can also enter the compressor 1 through the air supplement port 13 to perform secondary cooling on the compressor 1. It should be noted that the present invention does not limit the installation position and the specific structure of the air supplement port 13, and the technician can set the air supplement port according to the actual use requirement. In the preferred embodiment, the compressor cooling branch 101 is attached to the surface of the compressor 1 in a uniformly surrounding manner, but this attachment is not limited, and the technician may set the attachment according to the actual use requirement, for example, the attachment may be attached to the surface of the compressor 1 in a back and forth bending manner.
Further, in the present preferred embodiment, the compressor cooling branch 101 is made of metal, and the portions of the compressor cooling branch 101 that contact the shell of the compressor 1 are all connected to the shell of the compressor 1 by welding. Those skilled in the art will understand that this connection is not restrictive, and the skilled person can set the contact connection between the compressor cooling branch 101 and the compressor 1 according to the actual use requirement; preferably, a fixed connection is used between the compressor cooling branch 101 and the compressor 1, however, it is obvious to the skilled person that the compressor cooling branch 101 can also be attached to the compressor 1 by means of, for example, an interference fit only, and such a specific connection may be changed without departing from the basic principle of the present invention, and falls within the protection scope of the present invention.
With continued reference to fig. 1, in the preferred embodiment, the surrounding direction of the compressor cooling branch 101 is set from bottom to top, that is, in the case that the compressor 1 is installed in place, the compressor cooling branch 101 is surrounded from bottom to top, so that the refrigerant in the compressor cooling branch 101 can enter the compressor 1 from bottom to top. It should be noted that the arrangement of the specific surrounding direction is not limited, and the technician may set the surrounding direction according to the actual use requirement. In addition, a second throttling member 102 is further disposed at an upstream portion of the compressor cooling branch 101, and the air conditioning unit can control a flow rate of the refrigerant in the compressor cooling branch 101 through the second throttling member 102 and can also throttle the refrigerant in the compressor cooling branch 101. It should be noted that the present invention does not limit the specific structure of the second throttling component 102, and the skilled person can select it according to the actual use requirement; for example, the second restriction member 102 may be an electronic expansion valve.
Based on the structure of the air conditioning unit in the preferred embodiment, the refrigerant flowing condition of the air conditioning unit under the operation refrigeration working condition is as follows: the compressor 1 discharges high-temperature and high-pressure gaseous refrigerant through the exhaust port 12 and enters the oil separator 2 along with a small amount of lubricating oil, at the moment, the lubricating oil flows through the capillary tube 3 and then flows back to the compressor 1 through the air suction port 11, the gaseous refrigerant enters the four-way valve 4 and then enters the outdoor coil 5 through the four-way valve 4, the gaseous refrigerant releases heat and is condensed into high-pressure and medium-temperature liquid refrigerant in the outdoor coil 5, the liquid refrigerant is divided into two paths after passing through the first throttling component 6 and the one-way valve 7, the main path is that most of the liquid refrigerant directly enters the indoor coil 9, the liquid refrigerant absorbs heat and is evaporated into the gaseous refrigerant in the indoor coil 9 and then enters the four-way valve 4 again, and then enters the gas-liquid separator 8 and then flows back to the compressor 1 through; the auxiliary path is a refrigerant in which a small part of liquid refrigerant is throttled and depressurized by the second throttling component 102 to become a gas-liquid two-phase state, and flows in the compressor cooling branch 101 to absorb heat in the compressor 1 to cool the compressor 1 for the first time and change the heat into a gas refrigerant with medium temperature and medium pressure, and finally enters the compressor 1 through the air supplementing port 13 to cool the compressor 1 for the second time.
Further, the refrigerant flowing condition of the air conditioning unit under the heating working condition is as follows: the compressor 1 discharges high-temperature and high-pressure gaseous refrigerant through the exhaust port 12 and enters the oil separator 2 along with a small amount of lubricating oil, at the moment, the lubricating oil flows through the capillary tube 3 and then flows back to the compressor 1 through the air suction port 11, the gaseous refrigerant enters the four-way valve 4 and then enters the indoor coil 9 through the four-way valve 4, the gaseous refrigerant releases heat and is condensed into high-pressure and medium-temperature liquid refrigerant in the indoor coil 9, the liquid refrigerant flowing out of the indoor coil 9 is divided into two paths, the main path is that most of the liquid refrigerant is throttled by the first throttling component 6 and enters the outdoor coil 5, and the liquid refrigerants absorb heat and are evaporated into the gaseous refrigerant and enter the four-way valve 4 again in the outdoor coil 5, then enter the gas-liquid separator 8 and then flow back to the compressor 1 through the air suction; the auxiliary path is a refrigerant in which a small part of liquid refrigerant is throttled and depressurized by the second throttling component 102 to become a gas-liquid two-phase state, and flows in the compressor cooling branch 101 to absorb heat in the compressor 1 to cool the compressor 1 for the first time and change the heat into a gas refrigerant with medium temperature and medium pressure, and finally enters the compressor 1 through the air supplementing port 13 to cool the compressor 1 for the second time.
Further, the air conditioning unit further comprises an air inlet temperature sensor 103, an air supply temperature sensor 104 and an air outlet temperature sensor 105; the intake air temperature sensor 103 is disposed near the second throttling component 102 to measure the intake air temperature of the compressor cooling branch 101, and is preferably disposed downstream of the second throttling component 102 and at a distance of no more than 50mm from the pipeline of the second throttling component 102, so that the temperature detected by the intake air temperature sensor 103 can be as close as possible to the temperature of the gas-liquid two-phase refrigerant, the supplement air temperature sensor 104 is disposed at a portion of the compressor cooling branch 101 not in contact with the compressor 1 to accurately measure the temperature of the refrigerant in the compressor cooling branch 101 after the compressor 1 completes primary cooling, and the exhaust air temperature sensor 105 is disposed near the exhaust port 12 of the compressor 1 to accurately measure the exhaust air temperature of the compressor 1. In addition, it should be noted that the arrangement modes of the sensors are not restrictive, and technicians can set the arrangement modes of the sensors according to actual use requirements; changes in this particular arrangement do not depart from the basic principles of the invention and are intended to be within the scope of the invention.
Further, the air conditioning unit further comprises a controller, wherein the controller can acquire detection data of the air inlet temperature sensor 103, the air supply temperature sensor 104 and the air outlet temperature sensor 105, and can also control the operation of the air conditioning unit; for example, the opening degree of the second throttle member 102, etc. In addition, as can be understood by those skilled in the art, the present invention does not limit the specific structure and type of the controller, and the controller may be an original controller of the air conditioning unit, or may be a controller separately provided for executing the compressor cooling control method of the present invention, and a technician may set the structure and type of the controller according to actual use requirements.
Referring now to fig. 2, a flow chart of the steps involved in a preferred embodiment of the compressor cooling control method of the present invention is shown. As shown in fig. 2, based on the air conditioning unit described in the above preferred embodiment, the preferred embodiment of the method for controlling cooling of a compressor of the present invention specifically includes the following steps:
s101: acquiring the exhaust temperature of a compressor;
s102: judging whether the exhaust temperature is greater than a preset exhaust temperature or not; if yes, executing step S104; if not, executing step S103;
s103: controlling the second throttling element to keep a closed state;
s104: controlling the second throttling component to be opened at a preset initial opening degree;
s105: acquiring the temperature at the outlet of the second throttling component and the temperature at the outlet of the cooling branch of the compressor;
s106: calculating the difference value between the temperature at the outlet of the cooling branch of the compressor and the temperature at the outlet of the second throttling component;
s107: judging whether the difference value is larger than a preset temperature difference or not; if yes, go to step S109; if not, executing step S108;
s108: maintaining the opening degree of the second throttle member at a preset initial opening degree;
s109: the opening degree of the second throttle member is increased.
Further, in step S101, the controller can detect the discharge temperature of the compressor 1 by the discharge temperature sensor 105; it should be noted that this way of acquiring the discharge temperature is not limiting, and a technician may set a specific way of acquiring the discharge temperature of the compressor 1 by the controller according to actual use requirements, as long as the controller can acquire the discharge temperature of the compressor 1. Next, in step S102, the controller can determine whether the discharge temperature is greater than the preset discharge temperature, so as to determine whether the overheating phenomenon of the compressor 1 has occurred; it should be noted that, a technician may set a specific value of the preset exhaust temperature according to specific situations of different air conditioning units, and preferably, the preset exhaust temperature may be set to 105 ℃. It can be understood by those skilled in the art that although the preferred embodiment determines whether the compressor 1 is overheated by comparing the discharge temperature with the preset discharge temperature, it is obvious that other methods, such as comparing the ratio of the discharge temperature with the preset ratio, may be adopted. In addition, based on the judgment result of step S102, if the controller judges that the discharge temperature is less than or equal to the preset discharge temperature, it indicates that the compressor 1 does not overheat; in this case, step S103 is executed, i.e., the controller may control the second throttling member 102 to maintain the closed state. Meanwhile, if the controller judges that the exhaust temperature is greater than the preset exhaust temperature, the overheating phenomenon of the compressor 1 is indicated; in this case, step S104 is performed, i.e., the controller controls the second throttling member 102 to be opened at the preset initial opening degree. It should be noted that, a technician can set the size of the preset initial opening according to the actual use requirement; preferably, the preset initial opening degree is three tenths of the maximum opening degree of the second throttle member 102, e.g., 500 steps, and then 150 steps.
Further, after the second throttling element 102 has been opened by the preset initial opening, step S104 is executed, i.e. the controller can obtain the temperature at the outlet of the second throttling element 102 through the intake air temperature sensor 103, and obtain the temperature at the outlet of the compressor cooling branch 101 through the make-up air temperature sensor 104; it should be noted that this manner of acquiring the temperature is not limiting, and a technician may set a specific manner in which the controller acquires the temperature at the outlet of the second throttling member 102 and the temperature at the outlet of the compressor cooling branch 101 according to actual use requirements, for example, by calculation or the like, as long as the controller can acquire the temperature at the outlet of the second throttling member 102 and the temperature at the outlet of the compressor cooling branch 101. Next, in step S106, the controller can calculate the difference between the temperature at the outlet of the compressor cooling branch 101 and the temperature at the outlet of the second throttling member 102. If the difference is calculated, step S107 is executed, that is, the controller can determine whether the difference is greater than the preset temperature difference; it should be further noted that, a technician may set the magnitude of the preset difference according to the actual use condition, and preferably, the preset difference is 3 ℃. Based on the judgment result of step S107, if the difference is smaller than or equal to the preset temperature difference, it indicates that the cooling capacity of the compressor cooling branch 101 at this time matches the heating condition of the compressor 1; in this case, step S108 is performed, i.e., the opening degree of the second throttling member 102 is maintained at the preset initial opening degree. If the difference is larger than the preset temperature difference, the cooling capacity of the compressor cooling branch 101 at the moment is not enough to match the heating degree of the compressor 1; in this case, step S109 is performed, that is, the controller can increase the opening degree of the second throttling member 102, and the technician can set the increase range of each time according to the actual use requirement. Furthermore, the controller may also detect the discharge temperature of the compressor 1 in real time through the discharge temperature sensor 105 after the second throttling member 102 has been opened at the preset initial opening degree, so as to judge the closing timing of the second throttling member 102 according to the discharge temperature of the compressor 1, and preferably, the controller controls the second throttling member 102 to be closed when the discharge temperature is less than 95 ℃. Of course, the manner of determining the closing timing is not limited, and the technician may set the manner of determining the closing timing according to the actual use requirement.
Finally, it should be noted that the above examples are all preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. When the present invention is actually used, a part of the steps may be added or deleted as needed or the order between the different steps may be changed by those skilled in the art. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
So far, the technical solutions of the present invention have been described with reference to the accompanying drawings, but it is obvious to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. An air conditioning unit with a compressor cooling branch is characterized in that the air conditioning unit comprises a main circulation loop, and a compressor, an outdoor coil and an indoor coil which are arranged on the main circulation loop, wherein an air supplementing port is arranged on the compressor, the main circulation loop comprises a liquid pipe arranged between the outdoor coil and the indoor coil,
at least one part of the compressor cooling branch is attached to the compressor so that the refrigerant in the compressor cooling branch can carry out primary cooling on the compressor outside the compressor,
one end of the compressor cooling branch is connected with the air supplementing port, and the other end of the compressor cooling branch is connected with the liquid pipe, so that the refrigerant in the compressor cooling branch can enter the compressor to carry out secondary cooling on the compressor.
2. Air conditioning assembly according to claim 1, wherein at least a part of the compressor cooling branch is attached to the compressor in a circumferential manner.
3. Air conditioning assembly according to claim 2, wherein at least a part of the compressor cooling branch is connected in a fixed connection with the housing of the compressor.
4. Air conditioning assembly according to claim 3, characterized in that the compressor cooling branch is made of metal,
at least a portion of the compressor cooling branch is connected to a shell of the compressor by welding.
5. The air conditioning unit according to claim 2, wherein the surrounding direction of the compressor cooling branch is set such that, when the compressor is installed in place, the compressor cooling branch surrounds from bottom to top, so that the refrigerant in the compressor cooling branch enters the compressor from bottom to top.
6. Air conditioning assembly according to any of claims 1 to 5, wherein a throttling member is provided on the compressor cooling branch.
7. A cooling control method for a compressor of an air conditioning unit is characterized in that the air conditioning unit comprises a main circulation loop, the compressor, an outdoor coil and an indoor coil which are arranged on the main circulation loop, an air supplement port is arranged on the compressor, the main circulation loop comprises a liquid pipe arranged between the outdoor coil and the indoor coil, at least one part of a cooling branch of the compressor is attached to the compressor so that a refrigerant in the cooling branch of the compressor can carry out primary cooling on the compressor outside the compressor, one end of the cooling branch of the compressor is connected with the air supplement port, the other end of the cooling branch of the compressor is connected with the liquid pipe so that the refrigerant in the cooling branch of the compressor can enter the compressor to carry out secondary cooling on the compressor, and a throttling component is arranged on the cooling branch of the compressor, the compressor cooling control method includes:
acquiring the exhaust temperature of the compressor;
the open/close state of the throttle member is controlled according to the discharge temperature of the compressor.
8. The compressor cooling control method according to claim 7, wherein the step of controlling the open-closed state of the throttle member in accordance with the discharge temperature of the compressor specifically includes:
and if the exhaust temperature of the compressor is greater than the preset exhaust temperature, controlling the throttle member to be opened at a preset initial opening.
9. The compressor cooling control method according to claim 8, further comprising, after the throttle member is opened at the preset initial opening degree:
acquiring the temperature at the outlet of the throttling component and the temperature at the outlet of the cooling branch of the compressor;
selectively adjusting an opening of the throttling member based on a temperature at an outlet of the throttling member and a temperature at an outlet of the compressor cooling branch.
10. The compressor cooling control method according to claim 9, wherein the step of selectively adjusting the opening degree of the throttle member according to the temperature at the outlet of the throttle member and the temperature at the outlet of the compressor cooling branch passage specifically includes:
and if the difference between the temperature at the outlet of the cooling branch of the compressor and the temperature at the outlet of the throttling component is larger than the preset temperature difference, increasing the opening degree of the throttling component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911007090.6A CN110686423A (en) | 2019-10-22 | 2019-10-22 | Air conditioning unit with compressor cooling branch and compressor cooling control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911007090.6A CN110686423A (en) | 2019-10-22 | 2019-10-22 | Air conditioning unit with compressor cooling branch and compressor cooling control method |
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| Publication Number | Publication Date |
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| CN110686423A true CN110686423A (en) | 2020-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911007090.6A Pending CN110686423A (en) | 2019-10-22 | 2019-10-22 | Air conditioning unit with compressor cooling branch and compressor cooling control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111609586A (en) * | 2020-04-24 | 2020-09-01 | 珠海格力电器股份有限公司 | Double-temperature air conditioning system, control method and air conditioner |
| CN116498555A (en) * | 2023-04-04 | 2023-07-28 | 麦克维尔空调制冷(苏州)有限公司 | Semi-closed refrigeration compressor |
-
2019
- 2019-10-22 CN CN201911007090.6A patent/CN110686423A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111609586A (en) * | 2020-04-24 | 2020-09-01 | 珠海格力电器股份有限公司 | Double-temperature air conditioning system, control method and air conditioner |
| CN116498555A (en) * | 2023-04-04 | 2023-07-28 | 麦克维尔空调制冷(苏州)有限公司 | Semi-closed refrigeration compressor |
| CN116498555B (en) * | 2023-04-04 | 2023-10-31 | 麦克维尔空调制冷(苏州)有限公司 | Semi-closed refrigeration compressor |
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