CN114459178B - Heat exchange unit and air conditioning equipment - Google Patents
Heat exchange unit and air conditioning equipment Download PDFInfo
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- CN114459178B CN114459178B CN202210315894.8A CN202210315894A CN114459178B CN 114459178 B CN114459178 B CN 114459178B CN 202210315894 A CN202210315894 A CN 202210315894A CN 114459178 B CN114459178 B CN 114459178B
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- heat exchanger
- pressure
- heat exchange
- exchange unit
- controller
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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
- F25B45/00—Arrangements for charging or discharging refrigerant
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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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/001—Charging refrigerant to a 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
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/003—Control issues for charging or collecting refrigerant to or from a cycle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The embodiment of the application provides a heat exchange unit and air conditioning equipment, wherein the heat exchange unit comprises: a first heat exchanger; the second heat exchanger is connected with the first heat exchanger through a pipeline; the electromagnetic valve is arranged on the pipeline; the pressure sensor is arranged on the second heat exchanger and is used for detecting the pressure value of the refrigerant in the second heat exchanger; the controller is electrically connected with the pressure sensor and the electromagnetic valve; the refrigerant flows to the second heat exchanger through the first heat exchanger, and the controller controls the electromagnetic valve to be opened until the pressure value is larger than the first pressure threshold value. According to the technical scheme, by arranging the pressure sensor, low-pressure balance can be realized in the pipeline under the action of the controller, the possibility of starting the liquid-carrying device caused by excessive coolant flowing to the second side flow can be reduced, and the use experience of a user in the use process is greatly improved.
Description
Technical Field
The application relates to the technical field of air conditioning, in particular to a heat exchange unit and air conditioning equipment.
Background
At present, most air conditioners need the action of a refrigerant when in use, and when the equipment is flushed, the refrigerant can be flushed into an evaporator or a compressor under the influence of the flushing position and pressure due to the fluidity of the refrigerant, so that the situation of liquid carrying starting, oil running starting and even direct liquid compression can be generated during starting.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art or related art.
In view of the foregoing, embodiments of the present application provide a heat exchange unit.
Another embodiment of the present application provides an air conditioning apparatus.
To achieve the above object, an embodiment of the present application provides a heat exchange unit including: a first heat exchanger; the second heat exchanger is connected with the first heat exchanger through a pipeline; the electromagnetic valve is arranged on the pipeline; the pressure sensor is arranged on the second heat exchanger and is used for detecting the pressure value of the refrigerant in the second heat exchanger; the controller is electrically connected with the pressure sensor and the electromagnetic valve; the refrigerant flows to the second heat exchanger through the first heat exchanger, and the controller controls the electromagnetic valve to be opened until the pressure value is larger than the first pressure threshold value.
The heat exchange unit mainly comprises a first heat exchanger, a second heat exchanger, an electromagnetic valve and a pressure sensor, and particularly the first heat exchanger and the second heat exchanger respectively play roles of condensation and evaporation. In addition, because the flow direction of the refrigerant flows from the first heat exchanger to the second heat exchanger, the refrigerant pressure in the first heat exchanger is high, the refrigerant pressure in the second heat exchanger is low, and the pressure sensor is arranged on the second heat exchanger on the low pressure side, so that the low pressure of the refrigerant is detected, the flow of the refrigerant is controlled according to a specific pressure value, and particularly, the first heat exchanger flows to the second heat exchanger under the opening and closing action of the electromagnetic valve, so that low pressure balance is realized in a pipeline, the possibility that excessive refrigerant flows to the second side to cause liquid carrying start can be reduced, and the use experience of a user in the use process is greatly improved.
It should be noted that, the electromagnetic valve and the pressure sensor are all electrically connected with the controller, when the heat exchange unit is powered on wholly, before the unit is started, the electromagnetic valve needs to be opened first, when the pressure sensor detects a specific pressure value, the pressure value is compared with a first pressure threshold, when the pressure value exceeds the first pressure threshold, the electromagnetic valve is controlled to be closed, at the moment, the pressure value of the low pressure side is considered to reach a preset critical value, the low pressure balance operation before starting is satisfied, and the subsequent use is convenient.
The electromagnetic valve can be arranged at any position on the pipeline, and further can be arranged on a pipe section close to the first heat exchanger.
The technical scheme comprises the following steps: and the timer is electrically connected with the controller.
In the technical scheme, the timer electrically connected with the controller is arranged, so that the time of opening or closing various devices of the heat exchange unit can be counted, the time judgment is increased on the basis of pressure value comparison, the possibility that the control cannot be normally performed after the pressure value deviates due to measurement or other reasons can be effectively reduced, and the stability and reliability of the heat exchange unit in operation are ensured.
In the above technical solution, further includes: and the timer is used for determining the first delay time for starting the compressor and the second delay time for closing the compressor.
In the technical scheme, one side of the first heat exchanger is provided with a compressor communicated with the first heat exchanger, the compressor is mainly used for compressing a refrigerant to form high temperature and high pressure, and the compressor has the effects of condensation and evaporation respectively when the refrigerant flows into the first heat exchanger and the second heat exchanger through pipelines. In addition, after the heat exchange unit is not electrified for the first time, the refrigerant is injected into the internal pipeline at the moment, and during normal operation, the delay time after the compressor is started and the delay time after the compressor is closed are acquired through the timer, namely, the first delay time for the start of the compressor and the second delay time for the stop of the compressor are determined, so that the follow-up judgment of the delay time is facilitated, the opening and the closing of the compressor and the electromagnetic valve are controlled, the low-pressure balance and the starting balance in the pipeline are ensured, and the possibility of liquid carrying starting and even liquid compression is reduced.
It can be understood that in the whole liquid path circulation, the refrigerant is compressed by the compressor and then discharged into the first heat exchanger, and flows back to the compressor after being subjected to secondary heat exchange by the second heat exchanger, so that the circulation is realized.
In the above technical solution, the controller is configured to control the solenoid valve to open when the first delay time exceeds the second duration threshold or the pressure value is smaller than the second pressure threshold.
In the technical scheme, before the controller controls the electromagnetic valve to be opened, in order to prevent the liquid from being started, the compressor needs to be started first to convert the internal refrigerant into the high-temperature high-pressure gas state, and the precondition judgment exists at the moment, namely the first delay time and the pressure value are respectively judged, when the first delay time exceeds the second duration threshold value or the pressure value is smaller than the second pressure threshold value, the electromagnetic valve can be controlled to be opened after the gas state conversion is completed, so that the gas state refrigerant can sequentially and normally pass through the first heat exchanger and the second heat exchanger to complete heat exchange, and the refrigerant form in the pipeline is ensured to be identical with the normal heat exchange form.
In the above technical solution, the controller is configured to control the electromagnetic valve to close when the second delay time exceeds a third duration threshold or the pressure value is greater than a third pressure threshold.
In the technical scheme, after precompression of the refrigerant is completed, the second delay time and the pressure value after the compressor is stopped are obtained, whether the second delay time exceeds a third duration threshold or not is judged respectively, or the pressure value is larger than the third pressure threshold, under the condition that any condition is met, the electromagnetic valve is controlled to be closed, the refrigerant in the pipeline can fill the whole pipeline at the moment, so that the pressure at the second heat exchanger meets the normal starting requirement, and the low-pressure balance can be completed, and then the low-pressure heat exchanger operates in a normal heat exchange mode.
In the above technical solution, further includes: the throttling device is arranged on the pipeline and is electrically connected with the controller, and the throttling device is used for being opened by a first valve opening threshold before the controller controls the electromagnetic valve to be opened.
In this technical scheme, through setting up throttling arrangement on the pipeline, the refrigerant can form local shrink under throttling arrangement's effect to make the velocity of flow increase, static pressure reduction plays the effect of cooling decompression, in this embodiment, throttling arrangement mainly drops to evaporating pressure and evaporating temperature after condensing saturated liquid or supercooled liquid under the pressure in the first heat exchanger throttle, simultaneously according to the change of load, adjusts the flow of the refrigerant that gets into the second heat exchanger.
It is to be added that under the condition that the heat exchanger unit is balanced at low pressure, the throttling device is generally started after the refrigerant is injected for the first time, and in order to reduce the flow resistance of the refrigerant, the throttling device needs to be opened according to the opening threshold value of the first valve port, so that the refrigerant can normally flow to the second heat exchanger, and the low pressure balance is realized.
Wherein the restriction means includes, but is not limited to, a capillary tube and an expansion valve.
In the above technical solution, the timer is used for determining a duration time when the electromagnetic valve is opened, and the controller is further used for controlling the electromagnetic valve to be closed and controlling the valve port size of the throttling device to be adjusted to the opening of the standby valve port when the duration time exceeds a first time threshold value.
In the technical scheme, the heat exchange unit is started for the first time after the refrigerant is injected for the first time, the opening time of the electromagnetic valve is also required to be acquired by using the timer, and when the acquired duration exceeds the first time length threshold, the low-pressure balance is considered to be finished at present, so that the heat exchange can be normally carried out. At the moment, the electromagnetic valve can be controlled to be closed, the valve port of the throttling device is adjusted to be at the opening of the standby valve port, and the whole heat exchange unit can enter the standby state at the moment and wait for the normal heat exchange mode.
It will be appreciated that the precondition for closing the solenoid valve includes both a determination of the pressure value and a determination of the time to open the solenoid valve.
Typically, the standby valve port opening is less than the first valve port opening threshold.
In the above technical solution, further includes: the refrigerant flushing valve is arranged at a part, close to the first heat exchanger, of the pipeline, and is used for flushing refrigerant into the pipeline, and after the heat exchanger unit is electrified for the first time, the controller controls the electromagnetic valve to be opened.
In the technical scheme, the refrigerant flushing valve is arranged in the pipeline, so that the refrigerant can be flushed inwards through the refrigerant flushing valve. Specifically, when the heat exchanger unit is electrified for the first time after leaving the factory, the refrigerant is injected inwards through the refrigerant injection valve, and after the refrigerant injection is completed, the electromagnetic valve is controlled to be opened, so that the control of low-pressure balance is realized, and the normal operation of the heat exchanger unit is ensured.
The refrigerant flushing valve is positioned closer to the pipe section of the first heat exchanger, so that the phenomenon that the refrigerant directly rushes into the compressor or the second heat exchanger due to gravity, pressure and the like during flushing can be effectively reduced, and the normal operation of the heat exchange unit is influenced.
In the above technical solution, further includes: the first receiver is electrically connected with the controller and is used for receiving the low-pressure balance instruction, and the controller is used for controlling the operation of the electromagnetic valve and the throttling device according to the low-pressure balance instruction.
In the technical scheme, the first receiver electrically connected with the controller is arranged so as to receive the low-pressure balance instruction sent by a user or other equipment, and generally, the low-pressure balance instruction is received under the condition that the heat exchange unit is not started, namely the starting frequency is 0, and at the moment, the heat exchange unit only needs to perform low-pressure balance operation and only needs to control the operation of the electromagnetic valve and the throttling device according to the pressure value or time.
In the above technical solution, further includes: the second receiver is electrically connected with the controller and is used for receiving the anti-liquid-carrying starting instruction, and the controller is used for controlling the operation of the compressor and the electromagnetic valve according to the anti-liquid-carrying starting instruction.
In the technical scheme, the second receiver electrically connected with the controller is arranged so as to receive the anti-liquid-carrying starting instruction sent by a user or other equipment, and generally, the anti-liquid-carrying starting instruction is received under the condition that the heat exchange unit is started, namely the starting frequency is more than or equal to 1, and the starting of the heat exchange unit needs to carry out anti-liquid-carrying treatment at the moment, so that the operation of the electromagnetic valve and the compressor needs to be controlled according to the pressure value or time.
Another embodiment of the present application provides an air conditioning apparatus including: the shell and the heat exchange unit of any embodiment are arranged in the shell.
The air conditioning equipment mainly comprises a shell and a heat exchange unit, wherein the shell is mainly used for protecting the heat exchange unit. In addition, since the air conditioning apparatus includes the heat exchanger unit of any one of the embodiments, the air conditioning apparatus has the beneficial effects of any one of the heat exchanger units described above, and will not be described herein.
The air conditioning device may be a mobile air conditioner, a split air conditioner, or the like.
Additional aspects and advantages of the application will be set forth in part in the description which follows, or may be learned by practice of the application.
Drawings
FIG. 1 shows a schematic diagram of a heat exchanger unit according to one embodiment of the present application;
FIG. 2 shows a schematic structural view of a heat exchanger unit according to one embodiment of the present application;
FIG. 3 shows a schematic diagram of a heat exchanger unit according to one embodiment of the present application;
FIG. 4 shows a schematic structural view of a heat exchanger unit according to one embodiment of the present application;
fig. 5 shows a schematic structural view of an air conditioning apparatus according to an embodiment of the present application;
FIG. 6 shows a flow diagram of a restart anti-liquid control method according to one embodiment of the application;
fig. 7 shows a flow diagram of a control method of low pressure balancing prior to a first start-up according to one embodiment of the application.
The correspondence between the reference numerals and the component names in fig. 1 to 5 is:
100: a heat exchange unit; 102: a first heat exchanger; 104: a second heat exchanger; 106: an electromagnetic valve; 108: a pressure sensor; 110: a controller; 112: a timer; 114: a compressor; 116: a throttle device; 118: a refrigerant flushing valve; 200: an air conditioning apparatus; 202: a housing.
Detailed Description
In order that the above-recited objects, features and advantages of embodiments of the present application can be more clearly understood, a further detailed description of embodiments of the present application will be rendered by reference to the appended drawings and detailed description thereof. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, embodiments of the application may be practiced otherwise than as described herein, and therefore the scope of the application is not limited to the specific embodiments disclosed below.
Some embodiments according to the present application are described below with reference to fig. 1 to 7.
Example 1
As shown in fig. 1, a heat exchanger unit 100 provided in this embodiment mainly includes a first heat exchanger 102, a second heat exchanger 104, and an electromagnetic valve 106 and a pressure sensor 108, and specifically, the first heat exchanger 102 and the second heat exchanger 104 respectively perform condensation and evaporation effects, by performing on the first heat exchanger 102 and the second heat exchanger 104. In addition, since the refrigerant flows from the first heat exchanger 102 to the second heat exchanger 104, the refrigerant pressure in the first heat exchanger 102 is high, the refrigerant pressure in the second heat exchanger 104 is low, and the pressure sensor 108 is arranged on the second heat exchanger 104 on the low pressure side, so that the low pressure of the refrigerant is detected, and the flow of the refrigerant is controlled according to a specific pressure value, particularly, the first heat exchanger 102 flows to the second heat exchanger 104 under the opening and closing action of the electromagnetic valve 106, so that low pressure balance is realized in the pipeline, the possibility that excessive refrigerant flows to the second side, namely the second heat exchanger 104 side, to cause liquid carrying start can be reduced, and the use experience of a user in the use process is greatly improved.
It should be noted that, after the heat exchange unit 100 is powered on as a whole, before the unit is started, the electromagnetic valve 106 needs to be opened first, when the pressure sensor 108 detects a specific pressure value, the pressure value is compared with a first pressure threshold, and when the pressure value exceeds the first pressure threshold, the electromagnetic valve 106 is controlled to be closed, and at this time, the pressure value at the low pressure side is considered to reach a preset critical value, so that the low-pressure balance operation before starting is satisfied, and the subsequent use is facilitated.
The electromagnetic valve 106 may be disposed at any position on the pipeline, and further, may be disposed on a pipe section near the first heat exchanger 102.
It can be understood that by the scheme of the embodiment, the flow of excessive refrigerant to the low-pressure end can be effectively limited, so that the liquid carrying, the oil running and the hydraulic compression are started; the starting, running and stopping reliability of the evaporation cooling unit is greatly improved: meanwhile, the intelligent control system has the beneficial effects of timely and accurate control, avoidance of manual misoperation, safety, reliability and multipoint triggering.
Example two
As shown in fig. 1, a heat exchanger unit 100 provided in this embodiment mainly includes a first heat exchanger 102, a second heat exchanger 104, and an electromagnetic valve 106 and a pressure sensor 108, and specifically, the first heat exchanger 102 and the second heat exchanger 104 respectively perform condensation and evaporation effects, by performing on the first heat exchanger 102 and the second heat exchanger 104. In addition, since the refrigerant flows from the first heat exchanger 102 to the second heat exchanger 104, the refrigerant pressure in the first heat exchanger 102 is high, the refrigerant pressure in the second heat exchanger 104 is low, and the pressure sensor 108 is arranged on the second heat exchanger 104 on the low pressure side, so that the low pressure of the refrigerant is detected, and the flow of the refrigerant is controlled according to a specific pressure value, particularly, the first heat exchanger 102 flows to the second heat exchanger 104 under the opening and closing action of the electromagnetic valve 106, so that low pressure balance is realized in a pipeline, the possibility that excessive refrigerant flows to the second side to cause liquid carrying start can be reduced, and the use experience of a user in the use process is greatly improved.
It should be noted that, after the heat exchange unit 100 is powered on as a whole, before the unit is started, the electromagnetic valve 106 needs to be opened first, when the pressure sensor 108 detects a specific pressure value, the pressure value is compared with a first pressure threshold, and when the pressure value exceeds the first pressure threshold, the electromagnetic valve 106 is controlled to be closed, and at this time, the pressure value at the low pressure side is considered to reach a preset critical value, so that the low-pressure balance operation before starting is satisfied, and the subsequent use is facilitated.
The electromagnetic valve 106 may be disposed at any position on the pipeline, and further, may be disposed on a pipe section near the first heat exchanger 102.
In addition, as shown in fig. 2, a timer 112 electrically connected to the controller 110 is further provided, so that the time of opening or closing various devices of the heat exchange unit 100 can be counted, and the time judgment is added on the basis of pressure value comparison, so that the possibility that after the pressure value deviates due to measurement or other reasons, the control cannot be performed normally can be effectively reduced, and the stability and reliability of the heat exchange unit 100 in operation can be ensured.
In a specific embodiment, a compressor 114 is disposed on one side of the first heat exchanger 102 and is in communication with the first heat exchanger, and the compressor 114 is mainly used for compressing the refrigerant to form high temperature and high pressure, so as to respectively perform condensation and evaporation effects when flowing into the first heat exchanger 102 and the second heat exchanger 104 through the pipeline. In addition, after the heat exchange unit 100 is not electrified for the first time, the refrigerant is already injected into the internal pipeline at this time, and during normal operation, the delay time after the compressor 114 is started and the delay time after the compressor 114 is closed can be obtained through the timer 112, namely, the first delay time when the compressor 114 is started and the second delay time when the compressor 114 is closed are determined, so that the subsequent judgment of the delay time is facilitated, the opening and closing of the compressor 114 and the electromagnetic valve 106 are controlled, the low-pressure balance and the starting balance in the pipeline are ensured, and the possibility of liquid carrying starting and even liquid compression is reduced.
Further, according to the solution of the present embodiment, as shown in fig. 6, a specific restart anti-liquid-carrying control method is further provided, which specifically includes: step S102: powering up the heat exchanger unit; step S104: starting the compressor; step S106: judging whether the first delay time for starting the compressor exceeds a second time threshold value, generating a first judging result, or judging whether the pressure value is smaller than a second pressure threshold value, and generating a second judging result; step S108: when the first judging result or the second judging result is yes, controlling the electromagnetic valve to be opened; otherwise, the original state is maintained, step S110: and closing the electromagnetic valve when the second delay time exceeds a third duration threshold or the pressure value is larger than a third pressure threshold.
Before the control solenoid valve 106 is opened, in order to prevent the liquid from being started, the compressor 114 needs to be started first to convert the internal refrigerant into a high-temperature high-pressure gas state, and then precondition judgment exists, namely, the first delay time and the pressure value are respectively judged, when the first delay time exceeds a second duration threshold value or the pressure value is smaller than the second pressure threshold value, the solenoid valve 106 can be controlled to be opened after the gas state conversion is completed, and the compressor 114 is controlled to stop running, so that the gas refrigerant can sequentially and normally pass through the first heat exchanger 102 and the second heat exchanger 104 to complete heat exchange, and the refrigerant form in a pipeline is ensured to be the same as the normal heat exchange form.
After the precompression of the refrigerant is completed, a second delay time and a pressure value after the stop of the compressor 114 are obtained, whether the second delay time exceeds a third duration threshold or not is respectively judged, or the pressure value is larger than the third pressure threshold, under the condition that any condition is met, the electromagnetic valve 106 is controlled to be closed, at the moment, the refrigerant in the pipeline can fill the whole pipeline, so that the pressure at the second heat exchanger 104 meets the normal starting requirement, and the operation in a normal heat exchange mode can be realized after the low-pressure balance is completed.
Example III
As shown in fig. 1, a heat exchanger unit 100 provided in this embodiment mainly includes a first heat exchanger 102, a second heat exchanger 104, and an electromagnetic valve 106 and a pressure sensor 108, and specifically, the first heat exchanger 102 and the second heat exchanger 104 respectively perform condensation and evaporation effects, by performing on the first heat exchanger 102 and the second heat exchanger 104. In addition, since the refrigerant flows from the first heat exchanger 102 to the second heat exchanger 104, the refrigerant pressure in the first heat exchanger 102 is high, the refrigerant pressure in the second heat exchanger 104 is low, and the pressure sensor 108 is arranged on the second heat exchanger 104 on the low pressure side, so that the low pressure of the refrigerant is detected, and the flow of the refrigerant is controlled according to a specific pressure value, particularly, the first heat exchanger 102 flows to the second heat exchanger 104 under the opening and closing action of the electromagnetic valve 106, so that low pressure balance is realized in a pipeline, the possibility that excessive refrigerant flows to the second side to cause liquid carrying start can be reduced, and the use experience of a user in the use process is greatly improved.
It should be noted that, after the heat exchange unit 100 is powered on as a whole, before the unit is started, the electromagnetic valve 106 needs to be opened first, when the pressure sensor 108 detects a specific pressure value, the pressure value is compared with a first pressure threshold, and when the pressure value exceeds the first pressure threshold, the electromagnetic valve 106 is controlled to be closed, and at this time, the pressure value at the low pressure side is considered to reach a preset critical value, so that the low-pressure balance operation before starting is satisfied, and the subsequent use is facilitated.
The electromagnetic valve 106 may be disposed at any position on the pipeline, and further, may be disposed on a pipe section near the first heat exchanger 102.
Further, as shown in fig. 3, a throttling device 116 is disposed on the pipeline, and the refrigerant can form local contraction under the action of the throttling device 116, so that the flow rate is increased, the static pressure is reduced, and the effect of reducing the temperature and the pressure is achieved.
It should be added that, in the case that the throttling device 116 performs low-pressure balancing on the heat exchanger unit 100, the heat exchanger unit 100 is generally started after the refrigerant is injected for the first time, in order to reduce the resistance of the refrigerant flowing, the throttling device 116 needs to be opened with the first valve opening threshold, so that the refrigerant can normally flow to the second heat exchanger 104, so as to achieve low-pressure balancing.
Wherein the restriction 116 includes, but is not limited to, a capillary tube and an expansion valve.
In this embodiment, the heat exchanger unit 100 is started for the first time after the refrigerant is injected for the first time, and the opening time of the electromagnetic valve 106 needs to be obtained by using the timer 112. Specifically, according to the scheme of the present embodiment, as shown in fig. 7, a control method of low-pressure balance before first starting is also provided, which specifically includes: step S202: powering up the heat exchanger unit; step S204: controlling the throttling device to be opened by a first valve opening threshold value; step S206: controlling the electromagnetic valve to be opened; step S208: judging whether the duration of opening of the electromagnetic valve 106 exceeds a first time threshold, generating a third judging result, or judging whether the pressure value is larger than the first pressure threshold, generating a fourth judging result; step S210: and when the third judging result or the fourth judging result is yes, controlling the electromagnetic valve to be closed, controlling the valve port of the throttling device to be adjusted to the opening of the standby valve port, and otherwise, keeping the original state.
When the acquired duration exceeds the first time length threshold, the low-pressure balance is considered to be finished currently, and heat exchange can be performed normally. At this time, the electromagnetic valve 106 may be controlled to be closed, and the valve port of the throttling device 116 may be adjusted to the opening of the standby valve port, and at this time, the standby state of the whole heat exchanger unit 100 may be entered, and the normal heat exchange mode may be waited.
It will be appreciated that the precondition for closing the solenoid valve 106 includes both a determination of the pressure value and a determination of the time to open the solenoid valve 106.
Typically, the standby valve port opening is less than the first valve port opening threshold.
In addition to any of the above embodiments, as shown in fig. 4, a refrigerant flushing valve 118 is provided in the pipe, and refrigerant can be flushed inward through the refrigerant flushing valve 118. Specifically, when the heat exchanger unit 100 is powered on for the first time after leaving the factory, the refrigerant can be injected inwards through the refrigerant injection valve 118, and after the refrigerant injection is completed, the electromagnetic valve 106 is controlled to be opened, so that the control of low-pressure balance is realized, and the normal operation of the heat exchanger unit 100 is ensured.
It should be noted that, the refrigerant flushing valve 118 is located closer to the pipe section of the first heat exchanger 102, so that during flushing, the refrigerant can be effectively reduced from directly flushing into the compressor 114 or the second heat exchanger 104 due to gravity, pressure, etc., and the normal operation of the heat exchanger unit 100 is affected.
The refrigerant flushing valve 118 is arranged at the bottom of the high-pressure end condenser, the rear end is provided with a liquid path electromagnetic valve 106 for cutting off, so that the refrigerant is prevented from being flushed into the evaporator and the compressor 114 due to gravity, pressure and the like; the refrigerant of the finished product machine is fully injected at the high-pressure end, the low-pressure end is in a low-pressure alarm state before testing, and the electromagnetic valve 106 is controlled to discharge a small amount of refrigerant into the low-pressure end.
The controller 110 also needs to count the number of times of starting the heat exchanger unit 100, and in the case of never starting, that is, the number of times of starting is 0, the heat exchanger unit 100 only needs to perform the low-pressure balancing operation, and only needs to control the operation of the electromagnetic valve 106 and the throttle device 116 according to the pressure value or the time. In the case of non-initial start-up, i.e., the number of start-up times is 1 or more, the start-up of the heat exchanger unit 100 needs to be anti-fluid treatment, so that the operation of the solenoid valve 106 and the compressor 114 needs to be controlled according to the pressure value or time.
Example IV
As shown in fig. 5, an air conditioning apparatus 200 according to the present embodiment mainly includes a housing 202 and a heat exchanger unit 100, where the housing 202 is mainly used for protecting the heat exchanger unit 100. In addition, since the air conditioning apparatus 200 includes the heat exchanger unit 100 of any one of the embodiments, the air conditioning apparatus has the beneficial effects of any one of the heat exchanger units 100 described above, and will not be described herein.
The air conditioning apparatus 200 may be a mobile air conditioner, a split air conditioner, or the like.
Through the embodiment of the application, by arranging the pressure sensor, the low-pressure balance in the pipeline can be realized under the action of the controller, the possibility of starting the liquid-carrying device caused by excessive coolant flowing to the second side flow can be reduced, and the use experience of a user in the use process is greatly improved
In the present application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present application, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present application.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (11)
1. A heat exchange unit, comprising:
a first heat exchanger;
the second heat exchanger is connected with the first heat exchanger through a pipeline;
the electromagnetic valve is arranged on the pipeline;
the pressure sensor is arranged on the second heat exchanger and is used for detecting the pressure value of the refrigerant in the second heat exchanger;
the controller is electrically connected with the pressure sensor and the electromagnetic valve;
the refrigerant flows to the second heat exchanger through the first heat exchanger, and the controller controls the electromagnetic valve to be opened until the pressure value is larger than a first pressure threshold value, and controls the electromagnetic valve to be closed.
2. The heat exchange unit of claim 1, comprising:
and the timer is electrically connected with the controller.
3. The heat exchange unit of claim 2, further comprising:
and the timer is used for determining the first delay time for starting the compressor and the second delay time for closing the compressor.
4. A heat exchange unit according to claim 3, wherein the controller is adapted to control the solenoid valve to open when the first delay time exceeds a second duration threshold or the pressure value is less than a second pressure threshold.
5. A heat exchange unit according to claim 3, wherein the controller is adapted to control the solenoid valve to close when the second delay time exceeds a third duration threshold or the pressure value is greater than a third pressure threshold.
6. The heat exchange unit of claim 2, further comprising:
the throttling device is arranged on the pipeline and is electrically connected with the controller, and the throttling device is used for being opened by a first valve opening threshold before the controller controls the electromagnetic valve to be opened.
7. The heat exchange unit of claim 6, wherein the timer is configured to determine a duration of opening of the solenoid valve, and wherein the controller is further configured to control the solenoid valve to close and control the valve port of the restriction to adjust to a standby valve port opening when the duration exceeds a first time threshold.
8. The heat exchange unit of claim 1, further comprising:
the refrigerant flushing valve is arranged at a part, close to the first heat exchanger, of the pipeline, and is used for flushing refrigerant into the pipeline, and after the heat exchange unit is electrified for the first time, the controller controls the electromagnetic valve to be opened.
9. The heat exchange unit of claim 1, further comprising:
the first receiver is electrically connected with the controller and is used for receiving a low-pressure balance instruction, and the controller is used for controlling the operation of the electromagnetic valve and the throttling device according to the low-pressure balance instruction.
10. A heat exchange unit according to claim 3, further comprising:
the second receiver is electrically connected with the controller and is used for receiving a liquid-carrying prevention starting instruction, and the controller is used for controlling the operation of the compressor and the electromagnetic valve according to the liquid-carrying prevention starting instruction.
11. An air conditioning apparatus, comprising:
a housing;
a heat exchange unit according to any one of claims 1 to 10, disposed within the housing.
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| CN202210315894.8A CN114459178B (en) | 2022-03-29 | 2022-03-29 | Heat exchange unit and air conditioning equipment |
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| CN202210315894.8A CN114459178B (en) | 2022-03-29 | 2022-03-29 | Heat exchange unit and air conditioning equipment |
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| CN114459178B true CN114459178B (en) | 2023-08-29 |
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| CN114459178A (en) | 2022-05-10 |
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