CN112747391A - Air conditioning unit and compressor cooling control method thereof - Google Patents
Air conditioning unit and compressor cooling control method thereof Download PDFInfo
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- CN112747391A CN112747391A CN201911038355.9A CN201911038355A CN112747391A CN 112747391 A CN112747391 A CN 112747391A CN 201911038355 A CN201911038355 A CN 201911038355A CN 112747391 A CN112747391 A CN 112747391A
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- 238000001816 cooling Methods 0.000 title claims abstract description 336
- 238000004378 air conditioning Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000003507 refrigerant Substances 0.000 claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 239000007921 spray Substances 0.000 claims abstract description 24
- 230000001276 controlling effect Effects 0.000 claims description 29
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 230000005494 condensation Effects 0.000 claims 1
- 238000009833 condensation Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 17
- 239000002826 coolant Substances 0.000 description 7
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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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
- 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
-
- 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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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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
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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
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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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- 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
本发明属于空调技术领域，具体涉及一种空调机组及其压缩机冷却控制方法。本发明旨在解决现有空调机组的压缩机冷却控制方式不佳的问题。为此，本发明的空调机组包括冷却支路和主循环回路，冷却支路包括第一冷却支路和第二冷却支路，第一冷却支路的一端与冷凝器相连，第一冷却支路的另一端与压缩机的冷却口相连，第一冷却支路设置为能够利用压差将冷凝器中的液态冷媒导入压缩机中以实现喷淋冷却，第二冷却支路的一端也与冷凝器相连，第二冷却支路的另一端也与冷却口相连，第二冷却支路上设置有冷却泵，第二冷却支路设置为能够利用冷却泵将冷凝器中的液态冷媒导入压缩机中以实现喷淋冷却，以便在保证节能效果的同时，还能够始终保证其冷却效果。
The invention belongs to the technical field of air conditioners, and in particular relates to an air conditioner unit and a cooling control method for a compressor thereof. The invention aims to solve the problem that the compressor cooling control mode of the existing air conditioning unit is not good. To this end, the air conditioning unit of the present invention includes a cooling branch and a main circulation circuit, the cooling branch includes a first cooling branch and a second cooling branch, one end of the first cooling branch is connected to the condenser, and the first cooling branch is connected to the condenser. The other end of the cooling branch is connected to the cooling port of the compressor, the first cooling branch is set to be able to use the pressure difference to introduce the liquid refrigerant in the condenser into the compressor to achieve spray cooling, and one end of the second cooling branch is also connected to the condenser. The other end of the second cooling branch is also connected to the cooling port, a cooling pump is arranged on the second cooling branch, and the second cooling branch is set to be able to use the cooling pump to introduce the liquid refrigerant in the condenser into the compressor to achieve Spray cooling in order to ensure the cooling effect at all times while ensuring the energy saving effect.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioning unit and a compressor cooling control method thereof.
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. Although various designs of the air conditioning unit are more and more mature in recent years, the existing air conditioning unit still has some problems; for example, the compressor is an essential element of each air conditioning unit, and the compressor can change the state of the refrigerant through its own compression action, so that the compressor is easy to generate heat during operation. Particularly, for the inverter compressor, the inverter compressor is easy to generate an overheating phenomenon in the speed increasing process, so that the temperature of the compressor is overhigh; meanwhile, if the temperature of the compressor cannot be timely reduced, the compressor is easily burnt out, and the whole air conditioning unit cannot continue to work normally. Therefore, the operation of spray cooling the compressor is not negligible, and the existing air conditioning unit generally achieves the effect of cooling the compressor by arranging a liquid spray pipeline, namely, the cooling effect is achieved by directly introducing the refrigerant cooled by the condenser into the compressor.
Furthermore, a cooling port is usually arranged on the existing compressor, the liquid injection pipeline is connected with the cooling port, so that a refrigerant in the liquid injection pipeline can enter the compressor through the cooling port, a liquid refrigerant entering the compressor can realize a heat absorption effect through evaporation to reduce the temperature of the compressor, and an electromagnetic valve is further arranged at the cooling port to control the on-off of the liquid injection pipeline. Because the condenser belongs to a high-pressure environment, the existing air conditioning units only press the refrigerant into the compressor under the action of the high pressure; however, for the situation that the air conditioning unit is just started or the load of the air conditioning unit is suddenly increased, the compressor usually needs to be greatly increased in rotation speed, at this time, the compressor generates a large amount of heat, although there is a pressure difference between the condenser and the liquid injection pipeline, the pressure difference is not enough to provide enough refrigerant for cooling the compressor at all, so that the problem of insufficient cooling of the compressor is easily caused, and the normal use of the unit is even affected in severe cases. In order to avoid the problem of unstable refrigerant supply, the existing part of air conditioning units ensure that the liquid injection pipeline can normally supply the refrigerant all the time by additionally arranging a refrigerant pump on the liquid injection pipeline; however, more electric power is consumed to convey the refrigerant by the refrigerant pump, which is not beneficial to reducing the energy consumption of the air conditioning unit. Meanwhile, the coolant can easily cause cavitation erosion to the internal structure of the coolant pump, so that if the coolant pump works for a long time, the coolant can quickly cause great damage to the internal structure of the coolant pump, and the reliability and the service life of the coolant pump are greatly reduced. Therefore, the cooling methods have certain defects, and good cooling effect is difficult to ensure.
Accordingly, there is a need in the art for a new air conditioning unit and a method for controlling cooling of a compressor thereof 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 cooling control manner of the compressor of the existing air conditioning unit, the present invention provides an air conditioning unit, which includes a cooling branch and a main circulation loop, wherein the main circulation loop is provided with a compressor and a condenser, the compressor is provided with a cooling port, the cooling branch includes a first cooling branch and a second cooling branch, one end of the first cooling branch is connected with the condenser, the other end of the first cooling branch is connected with the cooling port, the first cooling branch is configured to be capable of guiding a liquid refrigerant in the condenser into the compressor by using pressure difference to realize spray cooling, one end of the second cooling branch is also connected with the condenser, and the other end of the second cooling branch is also connected with the cooling port, and the second cooling branch is provided with a cooling pump, and the second cooling branch is set to be capable of utilizing the cooling pump to guide the liquid refrigerant in the condenser into the compressor so as to realize spray cooling.
In a preferred embodiment of the air conditioning unit, the first cooling branch and/or the second cooling branch are further provided with a check valve.
In the preferable technical scheme of the air conditioning unit, the air conditioning unit further comprises a connecting branch, the first cooling branch and the second cooling branch are connected with the condenser through the connecting branch, and a switch valve is arranged on the connecting branch.
In the preferable technical scheme of the air conditioning unit, the air conditioning unit further comprises a pressure relief branch, one end of the pressure relief branch is connected to the downstream of the condenser, the other end of the pressure relief branch is connected to the downstream of the cooling pump, and a flow regulating valve is arranged on the pressure relief branch.
In addition, the invention also provides a compressor cooling control method for an air conditioning unit, the air conditioning unit comprises a cooling branch and a main circulation loop, the main circulation loop is provided with a compressor and a condenser, the compressor is provided with a cooling port, the cooling branch comprises a first cooling branch and a second cooling branch, one end of the first cooling branch is connected with the condenser, the other end of the first cooling branch is connected with the cooling port, the first cooling branch is set to be capable of guiding liquid refrigerant in the condenser into the compressor by utilizing pressure difference to realize spray cooling, one end of the second cooling branch is also connected with the condenser, the other end of the second cooling branch is also connected with the cooling port, the second cooling branch is provided with a cooling pump, and the second cooling branch is set to be capable of guiding liquid refrigerant in the condenser into the compressor by utilizing the cooling pump to realize the spray cooling Spraying and cooling on site; the compressor cooling control method includes: acquiring the temperature and the pressure ratio of the compressor; selectively controlling the cooling pump to turn on based on the temperature and pressure ratio of the compressor.
In a preferred embodiment of the above method for controlling cooling of a compressor of an air conditioning unit, the step of selectively controlling the cooling pump to be turned on according to the temperature and pressure ratio of the compressor includes: and if the time that the pressure ratio of the compressor is continuously less than or equal to a first preset pressure ratio reaches a first preset time and the temperature of the compressor is continuously greater than or equal to a first preset temperature in the first preset time, controlling the cooling pump to be started.
In a preferred embodiment of the above method for controlling cooling of a compressor of an air conditioning unit, the step of selectively controlling the cooling pump to be turned on according to the temperature and pressure ratio of the compressor further includes: if the time that the pressure ratio of the compressor is continuously greater than the first preset pressure ratio reaches a second preset time and the temperature of the compressor is continuously greater than or equal to a second preset temperature in the second preset time, controlling the cooling pump to be started; wherein the second preset temperature is greater than the first preset temperature.
In a preferred embodiment of the above method for controlling cooling of a compressor for an air conditioning unit, when the cooling pump is already turned on, the method further includes: obtaining the temperature and the pressure ratio of the compressor again; selectively controlling the cooling pump to shut down based on the temperature and pressure ratio of the compressor.
In a preferred embodiment of the above method for controlling cooling of a compressor of an air conditioning unit, the step of "selectively controlling the cooling pump to be turned off according to the temperature and pressure ratio of the compressor" specifically includes: if the time that the pressure ratio of the compressor is continuously greater than the second preset pressure ratio reaches a third preset time and the temperature of the compressor is continuously less than or equal to a third preset temperature in the third preset time, controlling the cooling pump to be closed; the second preset pressure ratio is greater than the first preset pressure ratio, and the third preset temperature is less than the first preset temperature.
In the preferable technical scheme of the method for controlling the cooling of the compressor of the air conditioning unit, the air conditioning unit further comprises a pressure relief branch, one end of the pressure relief branch is connected to the downstream of the condenser, the other end of the pressure relief branch is connected to the downstream of the cooling pump, a flow regulating valve is arranged on the pressure relief branch, and an electromagnetic valve is arranged at the cooling port of the compressor; the compressor cooling control method further includes: acquiring the opening and closing state of the electromagnetic valve under the condition that the cooling pump is in an opening state; if the electromagnetic valve is in an open state, controlling the flow regulating valve to be closed; and if the electromagnetic valve is in a closed state, controlling the flow regulating valve to be opened.
The technical scheme includes that the air conditioning unit comprises a cooling branch and a main circulation loop, a compressor and a condenser are arranged on the main circulation loop, a cooling port is formed in the compressor, the cooling branch comprises a first cooling branch and a second cooling branch, one end of the first cooling branch is connected with the condenser, the other end of the first cooling branch is connected with the cooling port, the first cooling branch is arranged to guide liquid refrigerant in the condenser into the compressor by using pressure difference to achieve spray cooling, one end of the second cooling branch is also connected with the condenser, the other end of the second cooling branch is also connected with the cooling port, a cooling pump is arranged on the second cooling branch, and the second cooling branch is arranged to guide liquid refrigerant in the condenser into the compressor by using the cooling pump to achieve spray cooling. The air conditioning unit effectively ensures good cooling effect by simultaneously arranging the first cooling branch and the second cooling branch, and when the pressure difference between the condenser and the compressor is enough to ensure the supply of the refrigerant in the cooling branches, the air conditioning unit realizes spray cooling through the first cooling branch so as to effectively reduce the loss of electric energy and simultaneously reduce the use of the cooling pump as much as possible, thereby prolonging the service life of the cooling pump to the greatest extent; when the pressure difference between the condenser and the compressor is too small to ensure the supply of the refrigerant, the air conditioning unit realizes spray cooling through the second cooling branch, namely, the normal supply of the refrigerant is effectively ensured by means of the power provided by the cooling pump, so that the spray cooling effect is effectively ensured, and the compressor can always obtain a good cooling effect. The invention can realize cooling by using different cooling branches under different conditions, so that the energy consumption of the air conditioning unit can be saved to the greatest extent under the condition of ensuring good cooling effect, and the service life of the cooling pump is prolonged.
Further, in a preferred technical scheme of the present invention, the first cooling branch and the second cooling branch of the present invention are both provided with a check valve, so as to effectively ensure that the refrigerant in the cooling branch only flows in a designated direction, further effectively ensure the cooling effect, and simultaneously effectively ensure the reliability of the air conditioning unit.
Further, in a preferred technical scheme of the present invention, the first cooling branch and the second cooling branch of the present invention are both connected to the condenser through a connecting branch, and the connecting branch is provided with a switch valve, when the first cooling branch and/or the second cooling branch are/is in failure, a maintenance worker can directly maintain the corresponding cooling branch by only closing the switch valve, so that the maintenance process of the cooling branch is simplified to the greatest extent.
Further, in a preferred technical scheme of the present invention, the air conditioning unit further ensures a cooling effect by providing a pressure relief branch, since the refrigerant delivered by the cooling pump does not go when the cooling port is closed, and in order to ensure a good cooling effect, the open/close state of the cooling port and the open/close state of the cooling pump are not strictly kept consistent; therefore, the cooling pump has the advantages that the refrigerant conveyed by the cooling pump can enter the downstream of the condenser through the pressure relief branch, so that the problem that the cooling pump needs to be repeatedly opened and closed in a short time under partial working conditions is effectively solved, and the service life of the cooling pump is effectively prolonged; meanwhile, the cooling pump can be effectively ensured to be changed in opening and closing states strictly according to use requirements, and the compressor can be effectively ensured to obtain a good cooling effect all the time.
Further, in a preferred embodiment of the present invention, the compressor cooling control method of the present invention can selectively control the cooling pump to be turned on according to a temperature and a pressure ratio of the compressor; specifically, the invention can determine whether the compressor has a cooling demand and the demand degree thereof according to the temperature of the compressor, and also can determine whether a good cooling effect can be ensured under the condition of not using the cooling pump according to the pressure ratio of the compressor, so that the air conditioning unit can selectively start the cooling pump according to different working conditions, and further effectively ensure that the cooling branch can always supply sufficient refrigerant to realize the cooling of the compressor.
Further, in a preferred technical solution of the present invention, if the time that the pressure ratio of the compressor continues to be less than or equal to the first preset pressure ratio reaches the first preset time and the temperature of the compressor continues to be greater than or equal to the first preset temperature within the first preset time, it indicates that the compressor has an overheating phenomenon and the pressure difference between the condenser and the compressor is insufficient; in this case, the air conditioning unit controls the cooling pump to be turned on, so as to effectively ensure that the second cooling branch can supply sufficient refrigerant to the compressor through the cooling pump to ensure the cooling effect.
Further, in a preferred embodiment of the present invention, if the time that the pressure ratio of the compressor is continuously greater than the first preset pressure ratio reaches the second preset time and the temperature of the compressor is continuously greater than or equal to the second preset temperature within the second preset time, it indicates that although there is a sufficient pressure difference between the condenser and the compressor, the temperature of the compressor is already high, and in order to effectively ensure the safety of the compressor, the temperature needs to be reduced quickly in time; under the condition, the air conditioning unit controls the cooling pump to be started so as to effectively ensure that the first cooling branch and the second cooling branch can simultaneously supply liquid refrigerants to the compressor, and further effectively ensure that the cooling branches can provide enough refrigerant supply quantity to realize timely and rapid cooling.
Further, in a preferred technical solution of the present invention, if the time that the pressure ratio of the compressor is continuously greater than the second preset pressure ratio reaches the third preset time and the temperature of the compressor is continuously less than or equal to a third preset temperature within the third preset time, it indicates that the compressor is difficult to overheat again within a short time, and at this time, the air conditioning unit controls the cooling pump to be turned off, so as to effectively save energy.
Further, in a preferred technical solution of the present invention, under the condition that the cooling pump is in an open state, if the electromagnetic valve is in an open state, it indicates that the compressor requires cooling, and at this time, the air conditioning unit controls the flow regulating valve to close, so that the cooling pump can send a refrigerant into the compressor to realize spray cooling; and if the electromagnetic valve is in a closed state, the compressor does not need to be cooled at the moment, and under the condition, the air conditioning unit controls the opening of the flow regulating valve, so that the refrigerant conveyed by the cooling pump can enter the main circulation loop through the pressure relief branch.
Drawings
Fig. 1 is a schematic overall structure of a preferred embodiment of the air conditioning assembly of the present invention;
fig. 2 is a flowchart of the steps of a preferred embodiment of the compressor cooling control method of the present invention.
Reference numerals: 11. a compressor; 111. a cooling port; 12. a condenser; 13. a throttle valve; 14. an evaporator; 15. a first cooling branch; 151. a first check valve; 16. a second cooling branch; 161. a second one-way valve; 162. a cooling pump; 17. connecting the branch circuits; 171. a first shut-off valve; 18. a pressure relief branch; 181. a flow regulating valve; 19. a filter; 20. a second stop valve; 21. a third stop valve.
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 preferred embodiment of the present invention, the terms "left", "right", "upper", "inner", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. It should also be noted that, unless otherwise expressly specified or limited in this description of preferred embodiments of the invention, the terms "connected," "connected," and the like are to be construed broadly and can include, for example, direct connection, indirect connection through an intermediary, and 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.
Referring first to fig. 1, the overall structure of the air conditioning unit of the present invention is schematically shown. As shown in fig. 1, the air conditioning unit of the present invention includes a main circulation loop, and a compressor 11, a condenser 12, a throttle valve 13, and an evaporator 14 sequentially disposed on the main circulation loop, wherein a refrigerant in the air conditioning unit circulates through the main circulation loop to achieve heat exchange; it should be noted that the present invention does not limit any particular type of the compressor 11, the condenser 12, the throttle valve 13 and the evaporator 14, and the skilled person can select them according to the actual use requirement. Of course, for convenience of description, only the main elements of the air conditioning unit are shown in fig. 1, and a technician may set the specific structure of the air conditioning unit according to the actual use requirement, and the present invention does not set any limitation on the specific structure of the main circulation loop of the air conditioning unit, and the change of the specific structure does not depart from the basic principle of the present invention, and belongs to the protection scope of the present invention. Meanwhile, a second stop valve 20 and a filter 19 are arranged between the condenser 12 and the throttle valve 13, and a third stop valve 21 is arranged between the throttle valve 13 and the evaporator 14; of course, these structural arrangements are not restrictive, and the technician can adjust the arrangement according to the actual use requirement. Further, the compressor 11 is provided with a cooling port 111, and the cooling port 111 is provided with an electromagnetic valve (not shown in the figure) capable of controlling an opening and closing state of the cooling port 111. In addition, as can be understood by those skilled in the art, the present invention does not set any limitation to the specific structure and the arrangement position of the cooling port 111, and the skilled person can set the configuration according to the actual use requirement as long as the compressor 11 can realize the function of spray cooling through the cooling port 111; meanwhile, the cooling port 111 may be provided with an electromagnetic valve to change the open/close state, or may be directly set to a normally open state.
Further, the air conditioning unit further comprises a cooling branch and a connecting branch 17, wherein the cooling branch comprises a first cooling branch 15 and a second cooling branch 16; referring to the orientation shown in fig. 1, the upper left end of the connecting branch 17 is connected to the condenser 12, the lower end of the first cooling branch 15 is connected to the right end of the connecting branch 17, the upper end of the first cooling branch 15 is connected to the cooling port 111, and the first cooling branch 15 is configured to guide the liquid refrigerant in the condenser 12 into the compressor 11 by using a pressure difference to realize spray cooling; the lower end of the second cooling branch 16 is also connected with the right end of the connecting branch 17, the upper end of the second cooling branch 16 is merged with the upper end of the first cooling branch 15 and is connected with the cooling port 111, a cooling pump 162 is arranged on the second cooling branch 16, and the second cooling branch 16 is set to be capable of guiding the liquid refrigerant in the condenser 12 into the compressor 11 by using the cooling pump 162 to realize spray cooling.
It should be noted that, as a preferred embodiment, the first cooling branch 15 and the second cooling branch 16 are both hard pipes connected between the connecting branch 17 and the cooling port 111; of course, the first cooling branch 15 and the second cooling branch 16 may have other structures that can circulate the cooling medium, such as rubber hoses. When the electromagnetic valve disposed at the cooling port 111 is opened, if the pressure difference between the compressor 11 and the condenser 12 is sufficient, the refrigerant in the condenser 12 enters the compressor 11 through the first cooling branch 15 under the action of the pressure difference, and at this time, the refrigerant cannot pass through the second cooling branch 16 because the cooling pump 162 disposed on the second cooling branch 16 is not opened; if the pressure difference between the compressor 11 and the condenser 12 is insufficient, the refrigerant in the condenser 12 is difficult to enter the compressor 11 through the first cooling branch 15 due to the pressure difference, and at this time, the cooling pump 162 is turned on, so that the refrigerant in the condenser 12 can enter the compressor 11 with the aid of the cooling pump 162.
Furthermore, it will be understood by those skilled in the art that, although the first cooling branch 15 and the second cooling branch 16 are described in the preferred embodiment as being connected to the condenser 12 by the connecting branch 17, the first cooling branch 15 and the second cooling branch 16 may obviously also be connected directly to the condenser 12; meanwhile, this specific connection manner is not limited, and the first cooling branch 15 and the second cooling branch 16 may be connected to a pipe connected to an outlet of the condenser 12, as long as the connection manner can introduce the liquid refrigerant in the condenser 12 into the connection branch 17, for example, a through hole is formed in the condenser 12, and the connection branch 17 is connected to the through hole, so that the refrigerant in the condenser 12 is introduced into the connection branch 17.
Further, in the preferred embodiment, for convenience of maintenance, the first stop valve 171 is disposed on the connecting branch 17, and the air conditioning unit can control the on-off state of the connecting branch 17 by controlling the open-close state of the first stop valve 171. It should be noted that although the first cut-off valve 171 is provided in the connecting branch 17 in the preferred embodiment, the connecting branch 17 may not be provided with a cut-off valve and is always in a communicating state; meanwhile, although the switch valve described in the preferred embodiment is a stop valve, it is obvious to a skilled person that the type of the switch valve may be selected according to actual use requirements, as long as the air conditioning unit can control the on-off state of the connecting branch 17 by controlling the switch valve.
With reference to fig. 1, in the preferred embodiment, the first cooling branch 15 is further provided with a first check valve 151, and the first check valve 151 can further prevent the refrigerant in the first cooling branch 15 from flowing backwards; when the compressor 11 needs cooling and the pressure difference between the compressor 11 and the condenser 12 is sufficient, the refrigerant in the condenser 12 can enter the compressor 11 through the first cooling branch 15 to achieve spray cooling. Meanwhile, the second cooling branch 16 is also provided with a second one-way valve 161, the second one-way valve 161 is arranged at the downstream of the cooling pump 162, and the second one-way valve 161 can further prevent the refrigerant in the second cooling branch 16 from flowing backwards; when the compressor 11 needs cooling and the pressure difference between the compressor 11 and the condenser 12 is insufficient, the cooling pump 162 is turned on, and the refrigerant in the condenser 12 can sequentially enter the compressor 11 through the cooling pump 162 and the second check valve 161 arranged on the second cooling branch 16 to achieve spray cooling. It should be noted that the present invention does not limit any specific types of the check valve and the cooling pump, which is preferably a magnetic pump, and the skilled person can set the type according to the actual use requirement.
Furthermore, the air conditioning unit further comprises a pressure relief branch 18, a left end of the pressure relief branch 18 is connected to a downstream of the condenser 12, a right end of the pressure relief branch 18 is connected between the cooling pump 162 and the second check valve 161, and a flow regulating valve 181 is arranged on the pressure relief branch 18. When the solenoid valve provided at the cooling port 111 is closed and the cooling pump 162 is opened, the refrigerant passing through the cooling pump 162 may be returned to the downstream of the condenser 12 through the pressure relief branch 18, so that the pressure balance is effectively ensured. It should be noted that, the present invention does not limit any specific connection position of the two ends of the pressure relief branch 18, as long as the refrigerant passing through the cooling pump 162 can flow back into the main circulation loop through the pressure relief branch 18, for example, the left end of the pressure relief branch 18 can also be directly connected to the condenser 12, and the right end of the pressure relief branch 18 can also be connected to the downstream of the second check valve 161, and the change of these specific connection positions does not deviate from the basic principle of the present invention, and belongs to the protection scope of the present invention. In addition, the present invention does not limit the specific type of the flow regulating valve 181, and the skilled person can select the type according to the actual use requirement.
Further, the air conditioning unit further includes a temperature sensor capable of measuring the temperature of the compressor 1, and a controller capable of acquiring measurement data of the temperature sensor, and also capable of controlling the operation of the air conditioning unit, for example, controlling the on/off state of the cooling pump 162, and the like. It should be noted that, the present invention does not limit the specific structure and model of the controller, as long as the controller can achieve the above functions, and the controller may be the original controller of the air conditioning unit, or may be a controller separately configured to execute the compressor cooling control method of the present invention, and a technician may set the structure and model of the controller according to actual use requirements. In addition, it should be noted that, a technician can set an application object of the compressor cooling control method according to actual use requirements; since the inverter compressor is easily over-heated, the compressor cooling control method of the present invention is preferably applied to the magnetic levitation inverter centrifugal type air conditioning unit, and of course, such specific application objects may be changed without departing from the basic principle of the present invention, and shall fall within the protection scope of the present invention.
Referring now to fig. 2, a flow chart of the steps of 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 foregoing embodiment, a preferred embodiment of the method for controlling cooling of a compressor of the present invention specifically includes the following steps:
s101: acquiring the temperature and the pressure ratio of a compressor;
s102: if the time that the pressure ratio of the compressor is continuously less than or equal to the first preset pressure ratio reaches the first preset time and the temperature of the compressor is continuously greater than or equal to the first preset temperature in the first preset time, controlling the cooling pump to be started;
s103: if the time that the pressure ratio of the compressor is continuously greater than the first preset pressure ratio reaches a second preset time and the temperature of the compressor is continuously greater than or equal to the second preset temperature in the second preset time, controlling the cooling pump to be started;
s104: obtaining the temperature and the pressure ratio of the compressor again;
s105: and if the time that the pressure ratio of the compressor is continuously greater than the second preset pressure ratio reaches a third preset time and the temperature of the compressor is continuously less than or equal to a third preset temperature in the third preset time, controlling the cooling pump to be closed.
Further, in step S101, the controller obtains the temperature of the compressor 11 through the temperature sensor; as a preferred embodiment, when the compressor 11 is an inverter compressor, the temperature sensor is disposed near an inverter of the compressor 11 so as to acquire the temperature of the inverter as the temperature of the compressor 11. In addition, it should be noted that the present invention does not limit the specific way in which the controller obtains the temperature of the compressor 11, as long as the controller can obtain the temperature of the compressor 11. Meanwhile, the controller can also obtain the absolute pressure of the exhaust port and the absolute pressure of the suction port of the compressor 11, then calculate the ratio of the absolute pressure of the exhaust port to the absolute pressure of the suction port, and record the ratio as the pressure ratio of the compressor 11; it should be noted that, the present invention does not limit the manner in which the controller obtains the absolute pressure of the exhaust port and the absolute pressure of the suction port of the compressor 11, and the skilled person can set the absolute pressure according to the actual use requirement as long as the controller can finally obtain the pressure ratio of the compressor 11.
Further, in step S102, if the controller determines that the time that the pressure ratio of the compressor 11 is continuously less than or equal to the first preset pressure ratio reaches the first preset time and the temperature of the compressor 11 is continuously greater than or equal to the first preset temperature within the first preset time, it indicates that the compressor 11 has the overheating phenomenon and the pressure difference between the condenser 12 and the compressor 11 is insufficient; in this case, the controller controls the cooling pump 162 to be turned on, so that the second cooling branch 16 can supply a sufficient amount of refrigerant into the compressor 11 through the cooling pump 162 to secure a cooling effect. It should be noted that, the present invention does not limit the specific values of the first preset pressure ratio, the first preset time and the first preset temperature, and a technician may set the first preset pressure ratio according to actual use requirements, as long as the pressure ratio of the compressor 11 is less than or equal to the first preset pressure ratio, the pressure difference between the compressor 11 and the condenser 12 can be determined to be insufficient, and preferably, the first preset pressure ratio is 1.5; a technician can also set the first preset temperature according to actual use requirements, as long as the temperature of the compressor 11 is greater than or equal to the first preset temperature, the compressor 11 can be judged to need to be cooled, and preferably, the first preset temperature is 47 ℃; and the technician can set the first preset time according to the actual use requirement, as long as the time is long enough to eliminate accidental errors, and preferably, the first preset time is 30 seconds.
Further, in step S103, if the controller determines that the time that the pressure ratio of the compressor 11 is continuously greater than the first preset pressure ratio reaches a second preset time and the temperature of the compressor 11 is continuously greater than or equal to the second preset temperature within the second preset time, it indicates that although there is a sufficient pressure difference between the condenser 12 and the compressor 11, the temperature of the compressor 11 is already high, so as to rapidly decrease the temperature; in this case, the controller controls the cooling pump 162 to be turned on, so as to effectively ensure that the first cooling branch 15 and the second cooling branch 16 can simultaneously supply the liquid refrigerant to the compressor 11. It should be noted that, the present invention does not limit the specific values of the second preset time and the second preset temperature, and a technician may set the second preset temperature according to actual use requirements, so long as the temperature of the compressor 11 is greater than or equal to the second preset temperature, it is determined that the compressor 11 needs to be rapidly cooled, and preferably, the second preset temperature is 48 ℃; and the technician can set the second preset time according to the actual use requirement, as long as the time is long enough to eliminate accidental errors, and preferably, the second preset time is 3 seconds.
It can be understood by those skilled in the art that the present invention does not limit the situations other than the above two situations, and the skilled person can set the on/off state of the cooling pump 162 corresponding to other situations; as a preferred embodiment, the cooling pump 162 is turned on only in the above two cases, and is not turned on in the remaining cases, i.e., remains off.
Further, in the case where the cooling pump 162 has been turned on, step S104 is performed, i.e., the controller can acquire the temperature and the pressure ratio of the compressor 11 again according to the above-described acquisition method. Next, in step S105, if the controller determines that the time during which the pressure ratio of the compressor 11 is continuously greater than the second preset pressure ratio reaches a third preset time and the temperature of the compressor 11 is continuously less than or equal to the third preset temperature during the third preset time, the controller controls the cooling pump 162 to be turned off. It should be noted that, the specific values of the second preset pressure ratio, the third preset time and the third preset temperature are not limited in the present invention, and a technician may set the second preset pressure ratio according to actual use requirements, as long as the pressure ratio of the compressor 11 is greater than the second preset pressure ratio, the pressure difference between the compressor 11 and the condenser 12 can be determined to be sufficient, and preferably, the second preset pressure ratio is 1.6; a technician can also set the third preset temperature according to actual use requirements, and as long as the temperature of the compressor 11 is less than or equal to the third preset temperature, the compressor 11 can be judged not to need to be cooled in a short time, and preferably, the third preset temperature is 46 ℃; the technician can set the third preset time according to the actual use requirement, as long as the time is long enough to eliminate accidental errors, and preferably, the third preset time is 10 seconds.
Further, the compressor cooling control method of the present invention further includes: in the case where the cooling pump 162 is already in the open state, the open-close state of the electromagnetic valve provided at the cooling port 111 is acquired so that the controller can control the open-close state of the flow rate adjustment valve 181 provided on the pressure relief branch passage 18 according to the open-close state of the electromagnetic valve. Specifically, if the electromagnetic valve is in an open state, the controller controls the flow regulating valve 181 to close, so that the refrigerant conveyed by the cooling pump 162 can completely enter the compressor 11 through the second cooling branch 16 to realize spray cooling; if the electromagnetic valve is in a closed state, the controller controls the flow regulating valve 181 to be opened, so that the refrigerant conveyed by the cooling pump 162 can enter the main circulation circuit through the pressure relief branch 18 to ensure pressure balance. It should be noted that, the specific opening and closing modes of the flow regulating valve 181 are not limited in the present invention, for example, the opening may be gradually increased to the maximum opening, or the opening may be directly increased to the preset opening without changing, and the technician may set the opening 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 preferred embodiments of the present invention have been described in conjunction with the accompanying drawings, but it is apparent 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)
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| CN201911038355.9A CN112747391A (en) | 2019-10-29 | 2019-10-29 | Air conditioning unit and compressor cooling control method thereof |
| PCT/CN2019/127935 WO2021082240A1 (en) | 2019-10-29 | 2019-12-24 | Air conditioning unit and compressor cooling control method therefor |
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