CN104728999A - Anti-freezing control method and device for heat exchanger of air conditioner - Google Patents
Anti-freezing control method and device for heat exchanger of air conditioner Download PDFInfo
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- CN104728999A CN104728999A CN201310719356.6A CN201310719356A CN104728999A CN 104728999 A CN104728999 A CN 104728999A CN 201310719356 A CN201310719356 A CN 201310719356A CN 104728999 A CN104728999 A CN 104728999A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000007710 freezing Methods 0.000 title claims abstract description 38
- 230000002528 anti-freeze Effects 0.000 claims description 41
- 230000008014 freezing Effects 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000004378 air conditioning Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 239000008358 core component Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an anti-freezing control method and device for a heat exchanger of an air conditioner. The anti-freezing control method of the heat exchanger of the air conditioner comprises the following steps: when the air conditioner is in a heating mode, detecting the air inlet temperature of a heat exchanger in the air conditioner; detecting the air outlet temperature of the heat exchanger; judging whether the inlet air temperature is lower than a first preset temperature or not; judging whether the outlet air temperature is lower than a second preset temperature or not; and if the inlet air temperature is judged to be lower than the first preset temperature and the outlet air temperature is judged to be lower than the second preset temperature, starting the anti-freezing protection of the heat exchanger. According to the invention, the problem of unreliable anti-freezing control of the heat exchanger in the prior art is solved, and the effect of improving the anti-freezing control reliability of the heat exchanger is further achieved.
Description
Technical field
The present invention relates to field of heat exchangers, in particular to a kind of antifreeze control method and device of heat exchanger of air conditioner.
Background technology
Current, along with civilian, industrial central air-conditioner is fast-developing, the processing procedure of air, the requirement for the treatment of effect also improve constantly.Demand for the automatic control of end packaged air conditioner in central air conditioner system also gets more and more.Heat exchanger as the thermoregulator core component of packaged air conditioner, so in the unit with automatic control function, the anti-frost protection for heat exchanger has also been necessary requirement.
At present in the anti-frost protection scheme of unitary air handling unit heat exchanger; generally: the surface temperature detecting heat exchanger coils; when coil surface temperature enters anti-freezing protection mode automatically lower than unit time 4 DEG C (can arrange other temperature value); control unit blowing-out machine; close new air-valve; water valve is reached maximum, display alarm.If when coil surface temperature is gone up more than 15 DEG C (can arrange other temperature value), exit anti-freezing protection mode.
Inventor finds, when utilizing such scheme to protect coil pipe, due to the restriction of coil arrangement; accurately cannot detect the surface temperature of coil pipe; in addition, cannot consider the temperature of running environment and extraneous air in testing process, above-mentioned multiple reason causes the antifreeze control of heat exchanger unreliable.
For the insecure problem of antifreeze control of heat exchanger in prior art, at present effective solution is not yet proposed.
Summary of the invention
Main purpose of the present invention is the antifreeze control method and the device that provide a kind of heat exchanger of air conditioner, to solve the insecure problem of antifreeze control of heat exchanger in prior art.
To achieve these goals, according to an aspect of the present invention, a kind of antifreeze control method of heat exchanger of air conditioner is provided.Antifreeze control method according to heat exchanger of the present invention comprises: when air-conditioner is in heat supply mode, detects the EAT of heat exchanger in air-conditioner; Detect the leaving air temp of heat exchanger; Judge whether EAT is less than the first preset temperature; Judge whether air temperature is less than the second preset temperature; If judge that EAT is less than the first preset temperature, and leaving air temp is less than the second preset temperature, then start the anti-frost protection of heat exchanger.
Further, after the anti-frost protection starting heat exchanger, antifreeze control method also comprises: detect whether air temperature is greater than the second preset temperature; And if detect that leaving air temp is greater than the second preset temperature, then close the anti-frost protection of heat exchanger.
Further, judge whether air temperature is less than the second preset temperature and comprises: judge whether air temperature continues to be less than the second preset temperature in the given time; If judge that EAT is less than the first preset temperature; and leaving air temp is less than the second preset temperature; then start anti-freezing protection mode to comprise: if judge that EAT is less than the first preset temperature; and leaving air temp continues to be less than the second preset temperature in the given time, then start the anti-frost protection of heat exchanger.
Further, after judging whether EAT is less than the first preset temperature, antifreeze control method also comprises: when judging that EAT is greater than the first preset temperature, controls air-conditioner and runs in the normal mode.
Further, after judging whether air temperature is less than the second preset temperature, antifreeze control method also comprises: when judging that leaving air temp is greater than the second preset temperature, controls air-conditioner and runs in the normal mode.
Further, the anti-frost protection starting heat exchanger comprises the following any one or more action of startup: stop centrifugal blower running; Close new air-valve and air returning valve; Surface cooler water valve is reached maximum; And output alarm information.
To achieve these goals, according to a further aspect in the invention, a kind of freezing protection control device of heat exchanger of air conditioner is provided.Freezing protection control device according to heat exchanger of the present invention comprises: the first detecting unit, for when air-conditioner is in heat supply mode, detects the EAT of heat exchanger in air-conditioner; Second detecting unit, for detecting the leaving air temp of heat exchanger; First judging unit, for judging whether EAT is less than the first preset temperature; Second judging unit, for judging whether air temperature is less than the second preset temperature; Start unit, for judging that EAT is less than the first preset temperature, and when leaving air temp is less than the second preset temperature, is starting the anti-frost protection of heat exchanger.
Further, freezing protection control device also comprises: the 3rd detecting unit, for after the anti-frost protection starting heat exchanger, detects whether air temperature is greater than the second preset temperature; And closing unit, for when detecting that leaving air temp is greater than the second preset temperature, close the anti-frost protection of heat exchanger.
Further, the second judging unit is also for judging whether air temperature continues to be less than the second preset temperature in the given time; Start unit is used for judging that EAT is less than the first preset temperature, and when leaving air temp continues to be less than the second preset temperature in the given time, starts the anti-frost protection of heat exchanger.
Further, freezing protection control device also comprises: the first control unit, for when judging that EAT is greater than the first preset temperature, controlling air-conditioner and running in the normal mode.
Further, freezing protection control device also comprises: the second control unit, for after judging whether air temperature is less than the second preset temperature, when judging that leaving air temp is greater than the second preset temperature, controls air-conditioner and runs in the normal mode.
By the present invention, adopt when air-conditioner is in heat supply mode, detect the EAT of heat exchanger in described air-conditioner; Detect the leaving air temp of described heat exchanger; Judge whether described EAT is less than the first preset temperature; Judge whether described leaving air temp is less than the second preset temperature; If judge that described EAT is less than described first preset temperature; and described leaving air temp is less than described second preset temperature; then start the anti-frost protection to described heat exchanger; solve the insecure problem of antifreeze control of heat exchanger in prior art, and then reach the effect of the antifreeze control reliability improving heat exchanger.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the antifreeze control method of heat exchanger of air conditioner according to a first embodiment of the present invention;
Fig. 2 is the flow chart of the antifreeze control method of heat exchanger of air conditioner according to a second embodiment of the present invention;
Fig. 3 is the flow chart of the antifreeze control method of heat exchanger of air conditioner according to a third embodiment of the present invention;
Fig. 4 is the schematic diagram of the freezing protection control device of heat exchanger of air conditioner according to a first embodiment of the present invention; And
Fig. 5 is the schematic diagram of the freezing protection control device of heat exchanger of air conditioner according to a second embodiment of the present invention.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in description of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Embodiments provide a kind of antifreeze control method of heat exchanger of air conditioner.
Fig. 1 is the flow chart of the antifreeze control method of heat exchanger of air conditioner according to a first embodiment of the present invention.As shown in the figure, the antifreeze control method of this heat exchanger of air conditioner comprises the steps:
Step S102, when air-conditioner is in heat supply mode, detects the EAT of heat exchanger in air-conditioner.
For the ease of the understanding of the specific embodiments to inventive embodiments, first introduce the operation principle of the heat exchanger in lower air-conditioner.
Heat exchanger in air-conditioner sucks new wind, and send into indoor to after new wind heating, the air after release heating, then air-conditioner is heating mode, is indoor heating.Heat exchanger in air-conditioner sucks new wind, and send into indoor to after new wind cooling, the air after release cooling, then air-conditioner is refrigeration mode.
When air-conditioner is in heat supply mode; mean that air themperature is lower; air-conditioner heat supply is needed to warm oneself; therefore; judge whether when air-conditioner is in heat supply to need to carry out anti-frost protection to the heat exchanger in air-conditioner; can avoiding frequently detecting heat exchanger the need of carrying out anti-frost protection, saving the power consumption of air-conditioner.
The temperature of the new wind that namely EAT of heat exchanger sucks, simply can be interpreted as the temperature of the air sucked outdoor.Therefore, when air-conditioner is in heat supply mode, detect the EAT of heat exchanger in air-conditioner.
Step S104, detects the leaving air temp of heat exchanger.
The leaving air temp of heat exchanger is about to the new wind of suction after the heating of heat exchanger, from the temperature of the air of heat exchanger release.Owing to only just can consider the anti-frost protection whether starting heat exchanger when air conditioner heat-production, leaving air temp herein only considers the temperature of the air-out after heat exchanger heating.
Step S106, judges whether EAT is less than the first preset temperature.
Judge whether EAT is less than the first preset temperature and can judges outside air temperature; if EAT is lower, then mean that outside air temperature is lower, when outside air temperature is lower; possible heat exchanger causes damage, and now needs the anti-frost protection judging whether to start heat exchanger.
The span of the first preset temperature can be 1 DEG C ~ 6 DEG C, is preferably 3 DEG C.
Step S108, judges whether air temperature is less than the second preset temperature.
Only take into account air temperature to judge whether that the anti-frost protection starting heat exchanger may cause judged result inaccurate, start anti-frost protection when not needing to carry out anti-frost protection, thus cause air-conditioner normally to run.
The span of the second preset temperature can be 8 DEG C ~ 12 DEG C, is preferably 10 DEG C.
Step S110, if judge that EAT is less than the first preset temperature, and leaving air temp is less than the second preset temperature, then start the anti-frost protection of heat exchanger.
If judge that EAT is less than the first preset temperature; then determine that outdoor temperature is lower; the infringement of heat exchanger may be caused; if judge that leaving air temp is less than the second preset temperature; then determine also to be in lower temperature in the air themperature after heating, now may cause the infringement of heat exchanger, therefore; in order to ensure that heat exchanger is from infringement, start the anti-frost protection of heat exchanger.
By detecting EAT and leaving air temp; judging that EAT is less than the first preset temperature; and leaving air temp is when being less than the second preset temperature; start the anti-frost protection of heat exchanger; the internal temperature of heat exchanger can be judged more accurately; thus determine that heat exchanger starts anti-frost protection, avoid occurring error protection, improve the reliability of heat exchanger anti-frost protection.
Fig. 2 is the flow chart of the antifreeze control method of heat exchanger of air conditioner according to a second embodiment of the present invention.As shown in the figure, the antifreeze control method of this heat exchanger of air conditioner comprises the steps:
Step S202, when air-conditioner is in heat supply mode, detects the EAT of heat exchanger in air-conditioner;
Step S204, detects the leaving air temp of heat exchanger;
Step S206, judges whether EAT is less than the first preset temperature;
Step S208, judges whether air temperature is less than the second preset temperature;
Step S210, if judge that EAT is less than the first preset temperature, and leaving air temp is less than the second preset temperature, then start the anti-frost protection of heat exchanger.
The content of the step S102 to step S110 shown in above-mentioned steps S202 to step S210 and Fig. 1 is identical, does not repeat at this.After the anti-frost protection starting heat exchanger, this antifreeze control method also comprises the steps:
Step S212, detects whether air temperature is greater than the second preset temperature.
Step S214, if detect that leaving air temp is greater than the second preset temperature, then closes the anti-frost protection of heat exchanger.
After the anti-frost protection starting heat exchanger; detect whether air temperature is greater than the second preset temperature, if detect that leaving air temp is greater than the second preset temperature, air themperature now can not cause damage by heat exchanger; heat exchanger does not need anti-frost protection, then close the anti-frost protection of heat exchanger.
Start anti-frost protection when needs carry out anti-frost protection, closing the anti-frost protection of heat exchanger when not needing to carry out anti-frost protection, the power consumption of heat exchanger can be saved, ensure that air-conditioning runs in normal condition.
Preferably, in order to judge whether to need to start anti-freezing protection mode more accurately, judge whether air temperature continues to be less than the second preset temperature in the given time.If judge that EAT is less than the first preset temperature, and leaving air temp continues to be less than the second preset temperature in the given time, then start the anti-frost protection of heat exchanger.
If there is temperature jump in the course of work of heat exchanger; the erroneous judgement to whether starting anti-frost protection may be caused; affect the normal work of air-conditioner; therefore; when judging whether air temperature is less than the second preset temperature, judge whether air temperature continues to be less than the second preset temperature in the given time, if judge that EAT is less than the first preset temperature; and leaving air temp continues to be less than the second preset temperature in Preset Time, then start the anti-frost protection of heat exchanger.The span of Preset Time can be 8 ~ 12s, is preferably 10s.
By judging whether air temperature continues to be less than the second preset temperature in Preset Time, when temperature jump appearring in heat exchanger, the anti-frost protection erroneous judgement that temperature jump causes can be overcome, thus improve the reliability of heat exchanger anti-frost protection.
Further, after judging whether EAT is less than the first preset temperature, antifreeze control method also comprises: when judging that EAT is greater than the first preset temperature, controls air-conditioner and runs in the normal mode.
If judge that EAT is greater than the first preset temperature, mean that air themperature is not enough to cause the infringement of heat exchanger, do not need to start anti-frost protection, control air-conditioner and run in the normal mode.
Further, after judging whether air temperature is less than the second preset temperature, antifreeze control method also comprises: when judging that leaving air temp is greater than the second preset temperature, controls air-conditioner and runs in the normal mode.
If judge that EAT is greater than the second preset temperature, mean that the leaving air temp through heat exchanger is not yet in reduced levels, air themperature is not enough to the infringement causing heat exchanger, does not need to start anti-frost protection, controls air-conditioner and runs in the normal mode.
Further, the anti-frost protection starting heat exchanger comprises the following any one or more action of startup: stop centrifugal blower running, close new air-valve and air returning valve, surface cooler water valve is reached maximum and output alarm information.
When starting the anti-frost protection of heat exchanger, start above-mentioned any one or multiple action, to protect heat exchanger from damage, meanwhile, air-conditioner is in running status.If when starting anti-freezing protection mode, the centrifugal blower of air-conditioner is in manual mode, then automatic centrifugal blower is switched to automatic mode, and it is out of service automatically to control centrifugal blower.
Because air-conditioner is in running status, therefore when detecting that the leaving air temp of air-conditioner is greater than the second preset temperature, closing the anti-frost protection of heat exchanger, making air-conditioner can automatically recover normal operation.
After closedown anti-frost protection, open centrifugal blower, centrifugal blower is opened rear 30S and is driven new air-valve to preset value, makes air-conditioner can recover normal operation.
If when various faults occurs air-conditioner simultaneously, the anti-frost protection of heat exchanger is limit priority, first starts the anti-frost protection of heat exchanger.
Be described below in conjunction with the detailed description of the invention of the object lesson in Fig. 3 to the embodiment of the present invention; it should be noted that; technical scheme of the present invention is not limited to the object lesson in Fig. 3; Fig. 3 just illustratively, does not limit technical scheme of the present invention only within the protection domain of the embodiment shown in Fig. 3.
Step S302, air-conditioner is started shooting.
Step S304, detects air-conditioner and whether is in heat supply mode, if detect that air-conditioner is in heat supply mode, then performs step S306, runs antifreeze trace routine, generally after air-conditioner start 30s, starts this antifreeze trace routine, to ensure air-conditioner stable operation.If detect that air-conditioner is in non-heat supply mode, then perform step S316, heat exchanger does not carry out anti-frost protection.
Step S308, detects new air temperature, and judges whether new air temperature is less than 3 DEG C, if judgement makes new advances, air temperature is less than 3 DEG C, then perform step S310, detect air temperature.If judgement makes new advances, air temperature is greater than 3 DEG C, then perform step S316, heat exchanger does not carry out anti-frost protection.
Step S312, judges whether air temperature continues 10s lower than 10 DEG C, if judge that leaving air temp continues 10s lower than 10 DEG C; then perform step S314; heat exchanger carries out anti-frost protection, if judge that leaving air temp does not continue 10s lower than 10 DEG C, then performs step S316.
Step S314, heat exchanger performs heat exchange protection, and the relevant action of execution comprises the following any one or more action of startup: stop centrifugal blower running, close new air-valve and air returning valve, surface cooler water valve is reached maximum and output alarm information
In sum; pass through the embodiment of the present invention; can by detecting EAT and leaving air temp; accurately judge whether the anti-frost protection starting heat exchanger; consider the running environment of air themperature and air-conditioning; solve the insecure problem of antifreeze control of heat exchanger in prior art, and then reach the effect of the antifreeze control reliability improving heat exchanger.
The freezing protection control device that the antifreeze control method of the embodiment of the present invention can be provided by the embodiment of the present invention performs, and the freezing protection control device of the embodiment of the present invention also may be used for performing the antifreeze control method that the embodiment of the present invention provides.
The embodiment of the present invention additionally provides a kind of freezing protection control device of heat exchanger of air conditioner.
Fig. 4 is the schematic diagram of the freezing protection control device of heat exchanger of air conditioner according to a first embodiment of the present invention.As shown in the figure, this freezing protection control device comprises the first detecting unit 10, second detecting unit 20, first judging unit 30, second judging unit 40 and start unit 50.
First detecting unit 10, for when air-conditioner is in heat supply mode, detects the EAT of heat exchanger in air-conditioner.
For the ease of the understanding of the specific embodiments to inventive embodiments, first introduce the operation principle of the heat exchanger in lower air-conditioner.
Heat exchanger in air-conditioner sucks new wind, and send into indoor to after new wind heating, the air after release heating, then air-conditioner is heating mode, is indoor heating.Heat exchanger in air-conditioner sucks new wind, and send into indoor to after new wind cooling, the air after release cooling, then air-conditioner is refrigeration mode.
When air-conditioner is in heat supply mode; mean that air themperature is lower; air-conditioner heat supply is needed to warm oneself; therefore; judge whether when air-conditioner is in heat supply to need to carry out anti-frost protection to the heat exchanger in air-conditioner; can avoiding frequently detecting heat exchanger the need of carrying out anti-frost protection, saving the power consumption of air-conditioner.
The temperature of the new wind that namely EAT of heat exchanger sucks, simply can be interpreted as the temperature of the air sucked outdoor.Therefore, the first detecting unit 10, for when air-conditioner is in heat supply mode, detects the EAT of heat exchanger in air-conditioner.
Second detecting unit 20 is for detecting the leaving air temp of heat exchanger.
The leaving air temp of heat exchanger is about to the new wind of suction after the heating of heat exchanger, from the temperature of the air of heat exchanger release.Owing to only just can consider the anti-frost protection whether starting heat exchanger when air conditioner heat-production, leaving air temp herein only considers the temperature of the air-out after heat exchanger heating.
First judging unit 30 is for judging whether EAT is less than the first preset temperature.
Judge whether EAT is less than the first preset temperature and can judges outside air temperature; if EAT is lower, then mean that outside air temperature is lower, when outside air temperature is lower; possible heat exchanger causes damage, and now needs the anti-frost protection judging whether to start heat exchanger.
The span of the first preset temperature can be 1 DEG C ~ 6 DEG C, is preferably 3 DEG C.
Second judging unit 40 is for judging whether air temperature is less than the second preset temperature.
Only take into account air temperature to judge whether that the anti-frost protection starting heat exchanger may cause judged result inaccurate, start anti-frost protection when not needing to carry out anti-frost protection, thus cause air-conditioner normally to run.
The span of the second preset temperature can be 8 DEG C ~ 12 DEG C, is preferably 10 DEG C.
Start unit 50 for judging that EAT is less than the first preset temperature, and when leaving air temp is less than the second preset temperature, starts the anti-frost protection of heat exchanger.
If judge that EAT is less than the first preset temperature; then determine that outdoor temperature is lower; the infringement of heat exchanger may be caused; if judge that leaving air temp is less than the second preset temperature; then determine also to be in lower temperature in the air themperature after heating, now may cause the infringement of heat exchanger, therefore; in order to ensure that heat exchanger is from infringement, start the anti-frost protection of heat exchanger.
By detecting EAT and leaving air temp; judging that EAT is less than the first preset temperature; and leaving air temp is when being less than the second preset temperature; start the anti-frost protection of heat exchanger; the internal temperature of heat exchanger can be judged more accurately; thus determine that heat exchanger starts anti-frost protection, avoid occurring error protection, improve the reliability of heat exchanger anti-frost protection.
Fig. 5 is the schematic diagram of the freezing protection control device of heat exchanger of air conditioner according to a second embodiment of the present invention.As shown in the figure, this freezing protection control device comprises the first detecting unit 10, second detecting unit 20, first judging unit 30, second judging unit 40 and start unit 50, also comprises the 3rd detecting unit 60 and closing unit 70.Wherein, first detecting unit 10, second detecting unit 20, first judging unit 30, second judging unit 40 and start unit 50 with embodiment illustrated in fig. 3 in the first detecting unit 10, second detecting unit 20, first judging unit 30, second judging unit 40 identical with start unit 50 function, do not repeat at this.
3rd detecting unit 60, for after the anti-frost protection starting heat exchanger, detects whether air temperature is greater than the second preset temperature.
Closing unit 70, for when detecting that leaving air temp is greater than the second preset temperature, closes the anti-frost protection of heat exchanger.
3rd detecting unit 60 is after the anti-frost protection starting heat exchanger; detect whether air temperature is greater than the second preset temperature; if detect that leaving air temp is greater than the second preset temperature; air themperature now can not cause damage by heat exchanger; heat exchanger does not need anti-frost protection, then close the anti-frost protection of heat exchanger.
Start anti-frost protection when needs carry out anti-frost protection, when not needing to carry out anti-frost protection, closing unit 70 closes the anti-frost protection of heat exchanger, can save the power consumption of heat exchanger, ensures that air-conditioning runs in normal condition.
Preferably, in order to judge whether to need to start anti-freezing protection mode more accurately, the second judging unit 40 is also for judging whether air temperature continues to be less than the second preset temperature in the given time.Start unit 50 for judging that EAT is less than the first preset temperature, and when leaving air temp continues to be less than the second preset temperature in the given time, starts the anti-frost protection of heat exchanger.
If there is temperature jump in the course of work of heat exchanger; the erroneous judgement to whether starting anti-frost protection may be caused; affect the normal work of air-conditioner; therefore; when judging whether air temperature is less than the second preset temperature, judge whether air temperature continues to be less than the second preset temperature in the given time, if judge that EAT is less than the first preset temperature; and leaving air temp continues to be less than the second preset temperature in Preset Time, then start the anti-frost protection of heat exchanger.The span of Preset Time can be 8 ~ 12s, is preferably 10s.
Judge whether air temperature continues to be less than the second preset temperature in Preset Time by the second judging unit 40; when there is temperature jump in heat exchanger; the anti-frost protection erroneous judgement that temperature jump causes can be overcome, thus improve the reliability of heat exchanger anti-frost protection.
Further, this freezing protection control device also comprises: the first control unit, for when judging that EAT is greater than the first preset temperature, controlling air-conditioner and running in the normal mode.
If judge that EAT is greater than the first preset temperature, mean that air themperature is not enough to cause the infringement of heat exchanger, do not need to start anti-frost protection, control air-conditioner and run in the normal mode.
Further, this freezing protection control device also comprises: the second control unit, for after judging whether air temperature is less than the second preset temperature, when judging that leaving air temp is greater than the second preset temperature, controls air-conditioner and runs in the normal mode.
If judge that EAT is greater than the second preset temperature, mean that the leaving air temp through heat exchanger is not yet in reduced levels, air themperature is not enough to the infringement causing heat exchanger, does not need to start anti-frost protection, controls air-conditioner and runs in the normal mode.
Further, the anti-frost protection that start unit 50 starts heat exchanger comprises and starts following any one or more action: stop centrifugal blower running, close new air-valve and air returning valve, surface cooler water valve is reached maximum and output alarm information.
When starting the anti-frost protection of heat exchanger, start above-mentioned any one or multiple action, to protect heat exchanger from damage, meanwhile, air-conditioner is in running status.If when starting anti-freezing protection mode, the centrifugal blower of air-conditioner is in manual mode, then automatic centrifugal blower is switched to automatic mode, and it is out of service automatically to control centrifugal blower.
Because air-conditioner is in running status, therefore when detecting that the leaving air temp of air-conditioner is greater than the second preset temperature, closing the anti-frost protection of heat exchanger, making air-conditioner can automatically recover normal operation.
After closedown anti-frost protection, open centrifugal blower, centrifugal blower is opened rear 30S and is driven new air-valve to preset value, makes air-conditioner can recover normal operation.
If when various faults occurs air-conditioner simultaneously, the anti-frost protection of heat exchanger is limit priority, first starts the anti-frost protection of heat exchanger.
In sum; pass through the embodiment of the present invention; can by detecting EAT and leaving air temp; accurately judge whether the anti-frost protection starting heat exchanger; consider the running environment of air themperature and air-conditioning; solve the insecure problem of antifreeze control of heat exchanger in prior art, and then reach the effect of the antifreeze control reliability improving heat exchanger.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. an antifreeze control method for heat exchanger of air conditioner, is characterized in that, comprising:
When air-conditioner is in heat supply mode, detect the EAT of heat exchanger in described air-conditioner;
Detect the leaving air temp of described heat exchanger;
Judge whether described EAT is less than the first preset temperature;
Judge whether described leaving air temp is less than the second preset temperature;
If judge that described EAT is less than described first preset temperature, and described leaving air temp is less than described second preset temperature, then start the anti-frost protection to described heat exchanger.
2. antifreeze control method according to claim 1, is characterized in that, after starting the anti-frost protection to described heat exchanger, described antifreeze control method also comprises:
Detect described leaving air temp and whether be greater than described second preset temperature; And
If detect that described leaving air temp is greater than described second preset temperature, then close the anti-frost protection to described heat exchanger.
3. antifreeze control method according to claim 1, is characterized in that,
Judge whether described leaving air temp is less than described second preset temperature and comprises: judge whether described leaving air temp continues to be less than described second preset temperature in the given time;
If judge that described EAT is less than described first preset temperature; and described leaving air temp is less than described second preset temperature; then start anti-freezing protection mode to comprise: if judge that described EAT is less than described first preset temperature; and described leaving air temp continues to be less than described second preset temperature within the described scheduled time, then start the anti-frost protection to described heat exchanger.
4. antifreeze control method according to claim 1, is characterized in that, after judging whether described EAT is less than the first preset temperature, described antifreeze control method also comprises:
When judging that described EAT is greater than described first preset temperature, controlling described air-conditioner and running in the normal mode.
5. antifreeze control method according to claim 1, is characterized in that, after judging whether described leaving air temp is less than the second preset temperature, described antifreeze control method also comprises:
When judging that described leaving air temp is greater than described second preset temperature, controlling described air-conditioner and running in the normal mode.
6. antifreeze control method according to claim 1, is characterized in that, starts and comprises the following any one or more action of startup to the anti-frost protection of described heat exchanger:
Centrifugal blower is stopped to run;
Close new air-valve and air returning valve;
Surface cooler water valve is reached maximum; And
Output alarm information.
7. a freezing protection control device for heat exchanger of air conditioner, is characterized in that,
First detecting unit, for when air-conditioner is in heat supply mode, detects the EAT of heat exchanger in described air-conditioner;
Second detecting unit, for detecting the leaving air temp of described heat exchanger;
First judging unit, for judging whether described EAT is less than the first preset temperature;
Second judging unit, for judging whether described leaving air temp is less than the second preset temperature;
Start unit, for judging that described EAT is less than described first preset temperature, and when described leaving air temp is less than described second preset temperature, starts the anti-frost protection to described heat exchanger.
8. freezing protection control device according to claim 7, is characterized in that, described freezing protection control device also comprises:
3rd detecting unit, for after starting the anti-frost protection to described heat exchanger, detects described leaving air temp and whether is greater than described second preset temperature; And
Closing unit, for when detecting that described leaving air temp is greater than described second preset temperature, closes the anti-frost protection to described heat exchanger.
9. freezing protection control device according to claim 7, is characterized in that,
Described second judging unit is also for judging whether described leaving air temp continues to be less than described second preset temperature in the given time;
Described start unit is used for judging that described EAT is less than described first preset temperature, and when described leaving air temp continues to be less than described second preset temperature within the described scheduled time, starts the anti-frost protection to described heat exchanger.
10. freezing protection control device according to claim 7, is characterized in that, described freezing protection control device also comprises:
First control unit, for when judging that described EAT is greater than described first preset temperature, controlling described air-conditioner and running in the normal mode.
11. freezing protection control devices according to claim 7, is characterized in that, described freezing protection control device also comprises:
Second control unit, for after judging whether described leaving air temp is less than the second preset temperature, when judging that described leaving air temp is greater than described second preset temperature, controls described air-conditioner and runs in the normal mode.
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