CN114459178A - Heat exchange unit and air conditioning equipment - Google Patents
Heat exchange unit and air conditioning equipment Download PDFInfo
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- CN114459178A CN114459178A CN202210315894.8A CN202210315894A CN114459178A CN 114459178 A CN114459178 A CN 114459178A CN 202210315894 A CN202210315894 A CN 202210315894A CN 114459178 A CN114459178 A CN 114459178A
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- Prior art keywords
- heat exchanger
- pressure
- controller
- refrigerant
- electromagnetic valve
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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
Abstract
An embodiment of the present invention provides a heat exchanger unit and an air conditioning apparatus, wherein the heat exchanger unit includes: 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 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 and controls the electromagnetic valve to be closed. According to the technical scheme, the low-pressure balance in the pipeline can be realized under the action of the controller by arranging the pressure sensor, the possibility of starting with liquid caused by the fact that excessive refrigerants flow to the second side can be reduced, and the use experience of a user in the using process is greatly improved.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a heat exchange unit and air conditioning equipment.
Background
Most air conditioners all need the effect of refrigerant when using at present, and when dashing annotating equipment, because the mobility of refrigerant self, can dash into evaporimeter or compressor by the influence of dashing annotating position and pressure, lead to can produce the circumstances of taking liquid to start, oil leakage start, direct liquid compression even when the start-up.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
In view of this, the embodiment of the present invention provides a heat exchanger unit.
Another embodiment of the present invention provides an air conditioning apparatus.
In order to achieve the above object, an embodiment of the present invention provides a heat exchanger 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 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 and controls the electromagnetic valve to be closed.
The heat exchange unit mainly comprises a first heat exchanger, a second heat exchanger, an electromagnetic valve and a pressure sensor, wherein the first heat exchanger and the second heat exchanger respectively achieve condensation and evaporation effects and are carried out on the first heat exchanger and the second heat exchanger. In addition, because the flow direction of refrigerant is by first heat exchanger to the second heat exchanger flow, so refrigerant pressure in the first heat exchanger is great, for the high pressure side, the refrigerant pressure of second heat exchanger is less, for the low pressure side, through set up pressure sensor on the second heat exchanger of low pressure side, then detect the low pressure of refrigerant, so that flow according to specific pressure value control refrigerant, specifically be first heat exchanger flow to the second heat exchanger under the switching action of solenoid valve, thereby make and realize low pressure balance in the pipeline, reducible excessive refrigerant leads to the possibility of taking liquid to start to the second side flow, greatly improve the user and experience in the use.
It should be noted that, the electromagnetic valve and the pressure sensor are both electrically connected with the controller, after the heat exchanger unit is wholly electrified, before the heat exchanger 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 value, when the pressure value exceeds the first pressure threshold value, the electromagnetic valve is controlled to be closed, at this moment, the pressure value on the low-pressure side is considered to reach a preset critical value, low-pressure balance operation before starting is met, and subsequent use is facilitated.
The electromagnetic valve can be arranged at any position on the pipeline, and further can be arranged on the pipe section close to the first heat exchanger.
In the above technical scheme, include: and the timer is electrically connected with the controller.
In the technical scheme, the timer electrically connected with the controller is arranged, the time of the heat exchanger set for opening or closing various devices can be counted, time judgment is added on the basis of comparison of pressure values, the possibility that control cannot be normally performed after deviation occurs to the pressure values due to measurement or other reasons can be effectively reduced, and the stability and the reliability of the heat exchanger set during operation are guaranteed.
In the above technical solution, further comprising: the compressor is communicated with the first heat exchanger and the second heat exchanger and is electrically connected with the controller, and the timer is used for determining first delay time for starting the compressor and second delay time for closing the compressor.
In the technical scheme, a compressor communicated with the first heat exchanger is arranged on one side of the first heat exchanger, and the compressor is mainly used for compressing a refrigerant to form high temperature and high pressure and respectively achieve condensation and evaporation effects when the refrigerant flows into the first heat exchanger and the second heat exchanger through pipelines. In addition, after the heat exchanger unit is not electrified for the first time, the refrigerant is injected into the internal pipeline at the moment, and when the heat exchanger unit is in normal operation, the time delay time after the compressor is started and the time delay time after the compressor is closed are obtained through the timer, namely, the first time delay time when the compressor is started and the second time delay time when the compressor is closed are determined, so that the opening and closing of the compressor and the electromagnetic valve are controlled conveniently and subsequently through the judgment of the time delay time, 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 circuit circulation, the refrigerant is firstly compressed by the compressor and then discharged into the first heat exchanger, and then flows back to the compressor after being subjected to secondary heat exchange by the second heat exchanger, so that circulation is realized.
In the above technical scheme, 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 this technical scheme, the controller is before the control solenoid valve opens, in order to prevent to take liquid to start, need start the compressor earlier, convert inside refrigerant into the high-temperature high-pressure gaseous state, there is the prerequisite judgement this moment, judge first delay time and pressure value respectively promptly, time threshold value when first delay time exceeds the second, when perhaps the pressure value is less than the second pressure threshold value, steerable is accomplishing gaseous state conversion back, open the solenoid valve again, make gaseous refrigerant can just accomplish the heat exchange through first heat exchanger and second heat exchanger in proper order, guarantee that the refrigerant form in the pipeline is the same with the form of normal heat transfer.
In the above technical scheme, 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 pre-compression of the refrigerant is completed, the second delay time and the pressure value after the compressor stops are obtained, whether the second delay time exceeds a third time threshold or not is judged respectively, or the pressure value is larger than a 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, the pressure at the second heat exchanger meets the normal starting requirement, and therefore the normal heat exchange mode can be operated after low-pressure balance is completed.
In the above technical solution, further comprising: and the throttling device is arranged on the pipeline and electrically connected with the controller, and the throttling device is used for opening at the first valve port opening degree threshold value before the controller controls the electromagnetic valve to open.
In this technical scheme, through set up throttling arrangement on the pipeline, the refrigerant can form local contraction under throttling arrangement's effect to make the velocity of flow increase, the static pressure reduces, plays the effect of cooling decompression, in this embodiment, throttling arrangement falls to evaporating pressure and evaporating temperature after mainly throttling the saturated liquid or the subcooled liquid under the condensing pressure in the first heat exchanger, simultaneously according to the change of load, adjusts the flow of the refrigerant that gets into the second heat exchanger.
What need supplement is that throttling arrangement carries out low pressure balance's the condition at heat exchanger unit under, generally for starting heat exchanger unit after annotating the refrigerant for the first time, in order to reduce the resistance that the refrigerant flows, need open throttling arrangement with first valve port aperture threshold value for the refrigerant can normally flow to the second heat exchanger, so that realize low pressure balance.
Wherein the throttling device includes, but is not limited to, a capillary tube and an expansion valve.
In the above technical scheme, the timer is used for determining the duration of the opening of the solenoid valve, and the controller is further used for controlling the solenoid valve to be closed and controlling the size of the valve port of the throttling device to be adjusted to the opening of the standby valve port when the duration exceeds a first duration threshold.
In the technical scheme, the heat exchange unit is started for the first time after the refrigerant is flushed for the first time, the opening time of the electromagnetic valve needs to be acquired by using the timer, and when the acquired duration time exceeds a first time length threshold value, the low-pressure balance is considered to be completed at present, so that heat exchange can be normally performed. At the moment, the electromagnetic valve can be controlled to be closed, the size of the valve port of the throttling device is adjusted to the opening degree of the standby valve port, and the whole heat exchange unit can enter a standby state to wait for a normal heat exchange mode.
It will be appreciated that the precondition for the closing of the solenoid valve includes both the determination of the pressure value and the determination of the time for opening the solenoid valve.
Generally, the standby valve port opening is smaller than the first valve port opening threshold.
In the above technical solution, further comprising: and the refrigerant flushing and injecting valve is arranged at the part, close to the first heat exchanger, in the pipeline, a refrigerant is flushed and injected into the pipeline through the refrigerant flushing and injecting valve, and after the heat exchange unit is electrified for the first time, the controller controls the electromagnetic valve to be opened.
In the technical scheme, the refrigerant flushing and injecting valve is arranged in the pipeline, and the refrigerant can be flushed and injected inwards through the refrigerant flushing and injecting valve. Specifically, when the heat exchanger unit is electrified for the first time after leaving a factory, a refrigerant can be flushed inwards through the refrigerant flushing and injecting valve, and after the refrigerant flushing and injecting is completed, the electromagnetic valve is controlled to be opened, so that the low-pressure balance control is realized, and the normal operation of the heat exchanger unit is ensured.
It should be noted that, the position of the refrigerant flushing and injecting valve is closer to the pipe section of the first heat exchanger, and when flushing and injecting, the problem that the refrigerant directly flushes into the compressor or the second heat exchanger due to gravity, pressure and the like to affect the normal operation of the heat exchange unit can be effectively reduced.
In the above technical solution, further comprising: the first receiver is electrically connected with the controller and used for receiving a low-pressure balance command, and the controller is used for controlling the operation of the electromagnetic valve and the throttling device according to the low-pressure balance command.
In this technical scheme, through setting up the first receiver of being connected with the controller electricity to in the low pressure balanced instruction that receiving user or other equipment sent, under general condition, the low pressure balanced instruction can be received under the condition that the heat exchanger group never started, starts the number of times promptly and is 0, and the heat exchanger group only need carry out the low pressure balanced operation this moment, only need control solenoid valve and throttling arrangement's operation according to pressure value or time.
In the above technical solution, further comprising: and the second receiver is electrically connected with the controller, the second receiver is used for receiving the 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.
In this technical scheme, through setting up the second receiver that is connected with the controller electricity to in receiving the liquid start instruction of preventing that user or other equipment sent, under the general condition, the liquid start instruction of preventing can receive under the condition that heat exchanger unit has started, start the number of times promptly for being more than or equal to 1, the start-up of heat exchanger unit needs to prevent taking liquid to handle this moment, thereby needs to control the operation of solenoid valve and compressor according to pressure value or time.
Another embodiment of the present invention provides an air conditioning apparatus including: the shell and the heat exchanger unit of any one of the embodiments are arranged in the shell.
The air conditioning equipment provided by the invention mainly comprises a shell and a heat exchange unit, wherein the shell is mainly used for protecting the heat exchange unit. In addition, because air conditioning equipment includes the heat exchanger unit of any above-mentioned embodiment, so have the beneficial effect of any above-mentioned heat exchanger unit, no longer describe here.
The air conditioning equipment can be a mobile air conditioner, a split air conditioner, and the like.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 shows a schematic structural diagram of a heat exchanger unit according to an embodiment of the present invention;
FIG. 2 shows a schematic structural diagram of a heat exchanger unit according to an embodiment of the present invention;
FIG. 3 shows a schematic structural diagram of a heat exchanger unit according to an embodiment of the present invention;
FIG. 4 shows a schematic structural diagram of a heat exchanger unit according to an embodiment of the present invention;
fig. 5 shows a schematic configuration diagram of an air conditioning apparatus according to an embodiment of the present invention;
FIG. 6 shows a flow diagram of a restart anti-carryover control method according to one embodiment of the present disclosure;
FIG. 7 illustrates a flow diagram of a method for controlling low pressure equalization prior to initial startup, according to one embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 5 is:
100: a heat exchanger 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 throttling device; 118: a refrigerant flushing and injecting valve; 200: an air conditioning device; 202: a housing.
Detailed Description
In order that the above objects, features and advantages of the embodiments of the present invention can be more clearly understood, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
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 present invention may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.
Some embodiments according to the invention are described below with reference to fig. 1 to 7.
Example one
As shown in fig. 1, a heat exchanger unit 100 according to the present embodiment mainly includes a first heat exchanger 102, a second heat exchanger 104, a solenoid 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 connecting the first heat exchanger 102 and the second heat exchanger 104. In addition, because the flow direction of the refrigerant flows from the first heat exchanger 102 to the second heat exchanger 104, the pressure of the refrigerant in the first heat exchanger 102 is high, the pressure of the refrigerant in the second heat exchanger 104 is low, and the pressure is low, the low pressure of the refrigerant is detected by arranging the pressure sensor 108 on the second heat exchanger 104 on the low pressure side, so that the flow of the refrigerant is controlled according to a specific pressure value, specifically, 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 of liquid-carrying starting caused by the flow of the excessive refrigerant to the second side, namely, the flow of the second heat exchanger 104 on the side, and the use experience of a user in the use process is greatly improved.
It should be noted that, the electromagnetic valve 106 and the pressure sensor 108 are both electrically connected to the controller 110, after the heat exchanger unit 100 is integrally powered on, before the unit is started, the electromagnetic valve 106 needs to be opened first, and when the pressure sensor 108 detects a specific pressure value, the pressure value is compared with a first pressure threshold value, when the pressure value exceeds the first pressure threshold value, the electromagnetic valve 106 is controlled to be closed, and at this time, it is considered that the pressure value on the low-pressure side has reached a preset critical value, so as to meet the low-pressure balance operation before starting, and facilitate subsequent use.
The solenoid valve 106 may be disposed at any position on the pipeline, and further, may be disposed on the pipe section near the first heat exchanger 102.
It can be understood that by the scheme of the embodiment, the flow of excessive refrigerants to the low-pressure end can be effectively limited, so that the start of liquid carrying, oil leakage and liquid compression is caused; greatly promote the reliability of the starting, running and stopping of the evaporation cooling unit: meanwhile, the system has the advantages of timely and accurate control, safety, reliability and multipoint triggering, and human misoperation prevention.
Example two
As shown in fig. 1, a heat exchanger unit 100 according to the present embodiment mainly includes a first heat exchanger 102, a second heat exchanger 104, a solenoid 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 connecting the first heat exchanger 102 and the second heat exchanger 104. In addition, because the flow direction of the refrigerant flows from the first heat exchanger 102 to the second heat exchanger 104, the pressure of the refrigerant in the first heat exchanger 102 is high, the pressure of the refrigerant 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, the flow of the refrigerant is controlled according to a specific pressure value, specifically, 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 the low-pressure balance in the pipeline is realized, the possibility of liquid-carrying starting caused by the flow of the excessive refrigerant to the second side is reduced, and the use experience of a user in the use process is greatly improved.
It should be noted that, the electromagnetic valve 106 and the pressure sensor 108 are both electrically connected to the controller 110, after the heat exchanger unit 100 is integrally powered on, before the unit is started, the electromagnetic valve 106 needs to be opened first, and when the pressure sensor 108 detects a specific pressure value, the pressure value is compared with a first pressure threshold value, when the pressure value exceeds the first pressure threshold value, the electromagnetic valve 106 is controlled to be closed, and at this time, it is considered that the pressure value on the low-pressure side has reached a preset critical value, so as to meet the low-pressure balance operation before starting, and facilitate subsequent use.
The solenoid valve 106 may be disposed at any position on the pipeline, and further, may be disposed on the pipe segment 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, which can count the time of the heat exchanger set 100 when various devices are turned on or off, and increase the time judgment based on the comparison of the pressure values, so that the possibility that the control cannot be performed normally after the pressure values are deviated due to measurement or other reasons can be effectively reduced, and the stability and reliability of the heat exchanger set 100 during operation can be ensured.
In a specific embodiment, a compressor 114 is disposed at one side of the first heat exchanger 102 and is communicated with the first heat exchanger, and the compressor 114 is mainly used for compressing the refrigerant to form a high temperature and a high pressure, and when the refrigerant flows into the first heat exchanger 102 and the second heat exchanger 104 through the pipeline, the refrigerant respectively performs condensation and evaporation effects. In addition, after the heat exchanger unit 100 is not powered on for the first time, the refrigerant is injected into the internal pipeline at this time, and when the heat exchanger unit operates normally, the timer 112 is used for obtaining the delay time after the compressor 114 is turned on and the delay time after the compressor 114 is turned off, that is, the first delay time when the compressor 114 is turned on and the second delay time when the compressor 114 is turned off are determined, so that the on and off of the compressor 114 and the electromagnetic valve 106 are controlled by judging the delay time, the low-pressure balance and the start balance in the pipeline are ensured, and the possibility of liquid-carrying start and even liquid compression is reduced.
Further, according to the solution of this embodiment, as shown in fig. 6, a specific restart anti-liquid-carrying control method is further provided, which specifically includes: step S102: powering on 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 length threshold value or not, and generating a first judgment result, or judging whether a pressure value is smaller than a second pressure threshold value or not, and generating a second judgment result; step S108: when the first judgment result or the second judgment result is yes, controlling the electromagnetic valve to be opened; otherwise, the original state is maintained, and step S110: and when the second delay time exceeds a third time threshold or the pressure value is greater than a third pressure threshold, the electromagnetic valve is closed.
Before the control solenoid valve 106 is opened, in order to prevent the start with liquid, the compressor 114 needs to be started first, the refrigerant inside is converted into a high-temperature and high-pressure gaseous state, the precondition judgment is performed at the moment, namely, the first delay time and the pressure value are judged respectively, when the first delay time exceeds the second time threshold value or the pressure value is smaller than the second pressure threshold value, the solenoid valve 106 is controlled to be opened again and the compressor 114 is controlled to stop running after the gaseous state conversion is completed, so that the gaseous refrigerant can sequentially and normally complete heat exchange through the first heat exchanger 102 and the second heat exchanger 104, and the refrigerant form in the pipeline is ensured to be the same as the normal heat exchange form.
After pre-compression of the refrigerant is completed, a second delay time and a pressure value after the compressor 114 is stopped are obtained, whether the second delay time exceeds a third time threshold or the pressure value is greater than a third pressure threshold is judged respectively, the electromagnetic valve 106 is controlled to be closed under the condition that any condition is met, the whole pipeline is filled with the refrigerant in the pipeline at the moment, the pressure at the second heat exchanger 104 meets the normal starting requirement, and therefore the normal heat exchange mode is used for operation after low-pressure balance is completed.
EXAMPLE III
As shown in fig. 1, a heat exchanger unit 100 according to the present embodiment mainly includes a first heat exchanger 102, a second heat exchanger 104, a solenoid 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 connecting the first heat exchanger 102 and the second heat exchanger 104. In addition, because the flow direction of the refrigerant flows from the first heat exchanger 102 to the second heat exchanger 104, the pressure of the refrigerant in the first heat exchanger 102 is high, the pressure of the refrigerant 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, the flow of the refrigerant is controlled according to a specific pressure value, specifically, 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 the low-pressure balance in the pipeline is realized, the possibility of liquid-carrying starting caused by the flow of the excessive refrigerant to the second side is reduced, and the use experience of a user in the use process is greatly improved.
It should be noted that, the electromagnetic valve 106 and the pressure sensor 108 are both electrically connected to the controller 110, after the heat exchanger unit 100 is integrally powered on, before the unit is started, the electromagnetic valve 106 needs to be opened first, and when the pressure sensor 108 detects a specific pressure value, the pressure value is compared with a first pressure threshold value, when the pressure value exceeds the first pressure threshold value, the electromagnetic valve 106 is controlled to be closed, and at this time, it is considered that the pressure value on the low-pressure side has reached a preset critical value, so as to meet the low-pressure balance operation before starting, and facilitate subsequent use.
The solenoid valve 106 may be disposed at any position on the pipeline, and further, may be disposed on the pipe segment near the first heat exchanger 102.
Further, as shown in fig. 3, the throttling device 116 is disposed on the pipeline, and the refrigerant can form a local contraction under the action of the throttling device 116, so as to increase the flow rate, decrease the static pressure, and perform the functions of reducing temperature and pressure.
It should be added that, under the condition that the heat exchanger unit 100 performs low pressure balance, the throttling device 116 generally starts the heat exchanger unit 100 after the refrigerant is first injected, and in order to reduce the resistance to the refrigerant flow, the throttling device 116 needs to be opened by the first valve port opening threshold, so that the refrigerant can normally flow to the second heat exchanger 104, and low pressure balance is realized.
In this embodiment, after the refrigerant is first injected, the heat exchanger unit 100 is first started, and the opening time of the electromagnetic valve 106 needs to be obtained by using the timer 112. Specifically, according to the solution of this embodiment, as shown in fig. 7, a method for controlling low-pressure balance before first start is further provided, which specifically includes: step S202: powering up the heat exchanger unit; step S204: controlling the throttle device to be opened by a first valve port opening threshold value; step S206: controlling the electromagnetic valve to be opened; step S208: judging whether the opening duration of the electromagnetic valve 106 exceeds a first duration threshold value to generate a third judgment result, or judging whether a pressure value is greater than the first pressure threshold value to generate a fourth judgment result; step S210: and if the third judgment result or the fourth judgment result is yes, the electromagnetic valve is controlled to be closed, the size of the valve port of the throttling device is controlled to be adjusted to the opening degree of the standby valve port, and if not, the original state is kept.
When the obtained duration time exceeds a first duration threshold value, the low-pressure balance is considered to be finished at present, and heat exchange can be normally carried out. At this time, the electromagnetic valve 106 can be controlled to be closed, the size of the valve port of the throttling device 116 is adjusted to the opening degree of the standby valve port, and the whole heat exchanger unit 100 can enter the standby state to wait for the normal heat exchange mode.
It will be appreciated that the precondition for the closing of the solenoid valve 106 includes both the determination of the pressure value and the determination of the time for opening the solenoid valve 106.
Generally, the standby valve port opening is smaller than the first valve port opening threshold.
In addition to any of the above embodiments, as shown in fig. 4, a refrigerant filling valve 118 is provided in the pipeline, and the refrigerant can be filled into the pipeline through the refrigerant filling valve 118. Specifically, when the heat exchanger unit 100 is powered on for the first time after leaving the factory, the refrigerant can be flushed inward through the refrigerant flushing valve 118, and after the refrigerant flushing is completed, the electromagnetic valve 106 is controlled to be opened, so that the low-pressure balance control is realized, and the normal operation of the heat exchanger unit 100 is ensured.
It should be noted that the position of the refrigerant flushing valve 118 is closer to the pipe section of the first heat exchanger 102, so that during flushing, the refrigerant can be effectively prevented from directly flushing into the compressor 114 or the second heat exchanger 104 due to gravity, pressure and the like, 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, and the rear end of the refrigerant flushing valve is cut off by the liquid path electromagnetic valve 106, so that the refrigerant is prevented from flushing into the evaporator and the compressor 114 due to gravity, pressure and the like; all refrigerants of the finished product machine are flushed and injected into the high-pressure end, the low-pressure end is in a low-pressure alarm state before testing, and the electromagnetic valve 106 needs to be controlled to discharge a small amount of refrigerants to the low-pressure end.
For the controller 110, the number of times of starting the heat exchanger set 100 needs to be counted, and in the case of never starting, that is, the number of times of starting is 0, at this time, the heat exchanger set 100 only needs to perform low-pressure balancing operation, and only needs to control the operation of the electromagnetic valve 106 and the throttling device 116 according to a pressure value or time. And under the condition of non-initial starting, namely the starting times are more than or equal to 1, at the moment, the starting of the heat exchanger unit 100 needs to be subjected to anti-liquid-carrying treatment, so that the operation of the electromagnetic valve 106 and the compressor 114 needs to be controlled according to the pressure value or time.
Example four
As shown in fig. 5, the air conditioning equipment 200 according to the present embodiment mainly includes a casing 202 and the heat exchanger unit 100, where the casing 202 is mainly used for protecting the heat exchanger unit 100. In addition, since the air conditioning equipment 200 includes the heat exchanger unit 100 according to any of the embodiments, the beneficial effects of any of the heat exchanger units 100 are achieved, and are not described herein again.
Among them, the air conditioning device 200 may be a mobile air conditioner, a split type air conditioner, or the like.
According to the embodiment of the invention, the pressure sensor is arranged, so that low-pressure balance can be realized in the pipeline under the action of the controller, the possibility of liquid-carrying starting caused by the flow of excessive refrigerant to the second side can be reduced, and the use experience of a user in the use process is greatly improved
In the present invention, the terms "first", "second", and "third" 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 limited otherwise. The terms "mounted," "connected," "fixed," and the like are used broadly and should be construed to include, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 invention. In this specification, the schematic representations of the terms used above 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 invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A heat exchanger 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 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 exchanger block of claim 1, comprising:
and the timer is electrically connected with the controller.
3. The heat exchanger block of claim 2, further comprising:
the compressor is communicated with the first heat exchanger and the second heat exchanger and electrically connected with the controller, and the timer is used for determining first delay time for starting the compressor and second delay time for closing the compressor.
4. The heat exchanger unit according to claim 3, wherein the controller is configured to control the solenoid valve to open when the first delay time exceeds a second time threshold or the pressure value is smaller than a second pressure threshold.
5. The heat exchanger unit according to claim 3, wherein the controller is configured to control the electromagnetic valve to close when the second delay time exceeds a third time threshold or the pressure value is greater than a third pressure threshold.
6. The heat exchanger block of claim 2, further comprising:
the throttling device is arranged on the pipeline and electrically connected with the controller, and the throttling device is used for opening at a first valve port opening degree threshold value before the controller controls the electromagnetic valve to open.
7. The heat exchanger unit according to claim 6, wherein the timer is configured to determine a duration of time when the solenoid valve is opened, and the controller is further configured to control the solenoid valve to be closed and control the valve port of the throttling device to be adjusted to a standby valve port opening degree when the duration of time exceeds a first duration threshold.
8. The heat exchanger block of claim 1, further comprising:
and the refrigerant flushing and injecting valve is arranged at the part, close to the first heat exchanger, of the pipeline, the refrigerant is flushed and injected into the pipeline through the refrigerant flushing and injecting valve, and the controller controls the electromagnetic valve to be opened after the heat exchanger unit is electrified for the first time.
9. The heat exchanger block of claim 1, further comprising:
the first receiver is electrically connected with the controller and used for receiving a low-pressure balance command, and the controller is used for controlling the operation of the electromagnetic valve and the throttling device according to the low-pressure balance command.
10. The heat exchange unit of claim 3, further comprising:
the second receiver is electrically connected with the controller and used for receiving the liquid-carrying-prevention starting instruction, and the controller is used for controlling the compressor and the electromagnetic valve to operate according to the liquid-carrying-prevention starting instruction.
11. An air conditioning apparatus characterized by comprising:
a housing;
the heat exchanger block of 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 (en) | 2023-08-29 |
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