CN103363601B - Heat pump type air adjusting device - Google Patents
Heat pump type air adjusting device Download PDFInfo
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- CN103363601B CN103363601B CN201210102383.4A CN201210102383A CN103363601B CN 103363601 B CN103363601 B CN 103363601B CN 201210102383 A CN201210102383 A CN 201210102383A CN 103363601 B CN103363601 B CN 103363601B
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Abstract
The invention provides a kind of heat pump type air adjusting device, comprise air conditioning major loop and the defroster for carrying out defrost operation to outdoor heat exchanger (103,203), air conditioning major loop comprises the compressor (101,201), four-way change-over valve (102,202), outdoor heat exchanger (103,203), expansion gear (107,207) and the indoor heat exchanger (110,210) that are connected in turn by refrigeration pipe, and defroster is the refrigerant heater (106,206) be connected on air conditioning major loop.According to heat pump type air adjusting device of the present invention, due to refrigerant heater of only connecting in air conditioning major loop namely can be implemented in heat while function that outdoor heat exchanger is defrosted, thus have that defroster structure is simple, the advantage of low cost of manufacture.
Description
Technical field
The present invention relates to filed of air conditioning, more specifically, relate to a kind of heat pump type air adjusting device.
Background technology
Heat pump type air adjusting device is in the process run cold season, and the temperature of outdoor heat exchanger is lower than environment temperature.If outdoor environment temperature is lower than less than 7 DEG C, the surface temperature of outdoor heat exchanger may lower than 0 DEG C.If the humidity of outdoor environment is enough large simultaneously, outdoor heat exchanger frosting can be caused, even icing, thus the serious heat exchange hindering outdoor heat exchanger, the heating performance of heat pump type air adjusting device is significantly decayed rapidly, significantly affect heating effect, even cause compressor of air conditioner to break down.Need to carry out defrosting process to outdoor heat exchanger in time for this reason.
Defrost mode traditional in prior art is as follows: defrost for making outdoor heat exchanger, four-way change-over valve is switched to kind of refrigeration cycle flow process, the refrigerant of the HTHP allowing compressor discharge is drained in outdoor heat exchanger through four-way change-over valve, to melt frost layer on outdoor heat exchanger or ice sheet.
But there is more drawback in traditional Defrost mode:
During defrosting, indoor evaporator absorbs room heat, affects the comfortableness in room.When adopting traditional defrosting mode to defrost, four-way change-over valve commutates, and the temperature of indoor heat exchanger is reduced to less than-20 DEG C fast, and a large amount of low temperature liquid refrigerants accumulates in indoor heat exchanger, absorb indoor set amount of heat by the mode of free convection, cause room temperature to decline.Especially in the winter of cold, off-premises station defrosting time is longer, and room dispels the heat relatively more violent by wall, and fluctuations in indoor temperature can be larger.According to comfortableness simulated experiment, room temperature is maximum can decline 8 ~ 10 DEG C, has had a strong impact on room comfortableness.
Again obtain hot blast and need the longer time.Adopt conventional defrost pattern, first need compressor shutdown, indoor heat exchange blower fan is after blowing waste heat after a while, and four-way change-over valve just commutates and defrosts.After having defrosted, compressor stagnates a period of time again, and then four-way change-over valve commutates again, heats.After a period of time opened by compressor, interior pipe temperature rise just can obtain hot blast to uniform temperature.This process approximately needs 12 ~ 15min even longer, totally unfavorable to the comfortableness in room.
Traditional defrosting mode is unfavorable for compressor reliability service.Adopt conventional defrost pattern, mainly utilize compressor to defrost to refrigerant institute work.When entering defrosting, the suction temperature of compressor maintains less than-25 DEG C even lower, and air-breathing meter pressure maintains 1 ~ 2bar, a large amount of liquid refrigerants accumulates in suction port of compressor place, as easy as rolling off a logly cause hydraulic compression, unfavorable to the reliability service of compressor, affect the actual life of compressor.
In prior art, also proposed the conditioner of continuously heating and defrosting, can realize continuing heating while defrost, such as the Chinese patent document of publication number CN1916538A, CN1916538A, CN101476801A all proposes the conditioner of respective continuously heating and defrosting.But the conditioner of various continuously heating and defrosting of the prior art, adopt at least two branch roads, and need to set up the devices such as multiple valve or electric expansion valve and coordinate and realize continuing heating while the function that defrosts, therefore pipeline and parts many, syndeton and control device are also very complicated, cause cost of manufacture all significantly to improve.
Summary of the invention
The object of the invention is to provide a kind of heat pump type air adjusting device, and this heat pump type air adjusting device adopts simple structure to be provided with while heating the function that outdoor heat exchanger defrosts.
The invention provides a kind of heat pump type air adjusting device, comprise: air conditioning major loop, comprise the compressor connected in turn by refrigeration pipe, four-way change-over valve, outdoor heat exchanger, expansion gear and indoor heat exchanger, the first interface of four-way change-over valve is communicated with the port of export of compressor, second interface is communicated with outdoor heat exchanger, 3rd interface is communicated with indoor heat exchanger, 4th interface is communicated with the arrival end of compressor, four-way change-over valve have by first interface and the second orifice and by the 3rd interface and the 4th orifice with make heat pump type air adjusting device carry out refrigerating operaton the first state and by first interface and the 3rd orifice and by the second interface and the 4th orifice with the second state making heat pump type air adjusting device carry out heating operation, defroster, for carrying out defrost operation to outdoor heat exchanger, defroster is the refrigerant heater be connected on air conditioning major loop.
Further, refrigerant heater is arranged between outdoor heat exchanger and expansion gear.
Further, refrigerant heater is arranged between suction port of compressor end and four-way change-over valve.
Further, heat pump type air adjusting device also comprises control device, control device controls heat pump type air adjusting device between different defrost control mode, switches to carry out defrost operation to outdoor heat exchanger, defrost control mode comprises: the first defrosting mode, under the first defrosting mode, four-way change-over valve is in the second state, and refrigerant heater is opened; Second defrosting mode, under the second defrosting mode, four-way change-over valve is in the first state, and refrigerant heater cuts out.
Further, heat pump type air adjusting device also comprises outside heat exchange blower fan; Control device also comprises the first temperature measuring equipment for detecting outdoor environment temperature, under the first defrosting mode, when the first temperature measuring equipment detects that outdoor environment temperature is greater than the first predetermined temperature, outside control device control room, heat exchange blower fan is opened, and outdoor environment temperature is less than or equal to heat exchange blower fan outside the first predetermined temperature timed unit control room and closes.
Further, heat pump type air adjusting device also comprises indoor heat exchange blower fan; Control device also comprises the second temperature measuring equipment of the coil temperature for detecting indoor heat exchanger, under the first defrosting mode, when the second temperature measuring equipment detects that the coil temperature of indoor heat exchanger is more than or equal to the second predetermined temperature, inside control device control room, heat exchange blower fan is opened, when detecting that the coil temperature of indoor heat exchanger is less than the 3rd predetermined temperature, inside control device control room, heat exchange blower fan cuts out, and wherein, the 3rd predetermined temperature is less than or equal to the second predetermined temperature.
Further, compressor continuous service.
Further, compressor is frequency-changeable compressor, and under the first defrosting mode, compressor runs in the frequency range of 60 to 120 hertz.
Further, control device also comprises the time detection device detecting the operation duration of heat pump type air adjusting device under the first defrosting mode, when time detection device detects that running duration is more than or equal to predetermined amount of time, control device controls heat pump type air adjusting device and switches to the second defrosting mode from the first defrosting mode.
Further, control device also comprises the 3rd temperature measuring equipment of the coil temperature for detecting outdoor heat exchanger, when heat pump type air adjusting device heating operation, when the 3rd temperature measuring equipment detects that the coil temperature of outdoor heat exchanger is less than or equal to the 4th predetermined temperature, control device controls refrigerant heater and opens.
Further, control device also comprises the first temperature measuring equipment for detecting outdoor environment temperature and the 3rd temperature measuring equipment for the coil temperature that detects outdoor heat exchanger, when heat pump type air adjusting device heating operation, when the 3rd temperature measuring equipment detects that the difference that outdoor heat exchanger coil temperature is less than the outdoor environment temperature that the first temperature measuring equipment detects exceedes predetermined temperature difference, control device controls refrigerant heater and opens.
Further, control device also comprises the first temperature measuring equipment for detecting outdoor environment temperature, when heat pump type air adjusting device heating operation, when the first temperature measuring equipment detects that outdoor environment temperature is less than or equal to the 5th predetermined temperature, control device controls refrigerant heater and opens.
According to heat pump type air adjusting device of the present invention, due to refrigerant heater of only connecting in air conditioning major loop namely can be implemented in heat while function that outdoor heat exchanger is defrosted, thus have that defroster structure is simple, the advantage of low cost of manufacture.
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 system schematic of heat pump type air adjusting device according to a first embodiment of the present invention;
Fig. 2 is that the refrigerant of heat pump type air adjusting device refrigerating operaton according to a first embodiment of the present invention flows to schematic diagram;
Fig. 3 is that the refrigerant of heat pump type air adjusting device heating operation according to a first embodiment of the present invention flows to schematic diagram;
Fig. 4 is that the refrigerant that heat pump type air adjusting device is according to a first embodiment of the present invention run under the first defrosting mode flows to schematic diagram;
Fig. 5 is that the refrigerant that heat pump type air adjusting device is according to a first embodiment of the present invention run under the second defrosting mode flows to schematic diagram;
Fig. 6 is the system schematic of heat pump type air adjusting device according to a second embodiment of the present invention;
Fig. 7 is that the refrigerant of heat pump type air adjusting device refrigerating operaton according to a second embodiment of the present invention flows to schematic diagram;
Fig. 8 is that the refrigerant of heat pump type air adjusting device heating operation according to a second embodiment of the present invention flows to schematic diagram;
Fig. 9 is that the refrigerant that heat pump type air adjusting device is according to a second embodiment of the present invention run under the first defrosting mode flows to schematic diagram; And
Figure 10 is that the refrigerant that heat pump type air adjusting device is according to a second embodiment of the present invention run under the second defrosting mode flows to schematic diagram.
Respectively representative is marked in figure:
101,201 compressors
102,202 four-way change-over valves
103,203 outdoor heat exchangers
104,204 outside heat exchange blower fans
105,205 outside heat exchange blower motors
106,206 refrigerant heaters
107,207 electric expansion valves
108,208 indoor heat exchange blower motors
109,209 indoor heat exchange blower fans
110,210 indoor heat exchangers
Detailed description of the invention
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
First embodiment
As shown in Figures 1 to 5, the heat pump type air adjusting device of the first embodiment comprises air conditioning major loop and the defroster for carrying out defrost operation to outdoor heat exchanger 103.Air conditioning major loop connects compressor 101, four-way change-over valve 102, outdoor heat exchanger 103, electric expansion valve 107 and indoor heat exchanger 110 in turn by refrigeration pipe and is formed.Electric expansion valve 107 is free adjustment aperture in the open range of complete shut-down and standard-sized sheet.The first interface of four-way change-over valve 102 is communicated with the port of export of compressor 101, the second interface is communicated with outdoor heat exchanger 103, the 3rd interface is communicated with indoor heat exchanger 110, the 4th interface is communicated with the arrival end of compressor 101.Four-way change-over valve 102 have by first interface and the second orifice and by the 3rd interface and the 4th orifice with make heat pump type air adjusting device carry out refrigerating operaton the first state and by first interface and the 3rd orifice and by the second interface and the 4th orifice with the second state making heat pump type air adjusting device carry out heating operation.Defroster is the refrigerant heater 106 be connected between outdoor heat exchanger 103 and electric expansion valve 107.
The heat pump type air adjusting device of the first embodiment, due to refrigerant heater 106 of only connecting in air conditioning major loop namely can be implemented in heat while function that outdoor heat exchanger is defrosted, thus have that defroster structure is simple, the advantage of low cost of manufacture.The sensible heat of refrigerant can be utilized to defrost to outdoor heat exchanger, and performance is more superior.
Heat pump type air adjusting device four-way change-over valve 102 when refrigerating operaton of the first embodiment is in the first state.As shown in Figure 2, when refrigerating operaton, refrigerant circulates according to following flow direction: compressor 101 → four-way change-over valve 102 → outdoor heat exchanger 103 → refrigerant heater 106 → electric expansion valve 107 → indoor heat exchanger 110 → four-way change-over valve 102 → compressor 101.When refrigerating operaton, refrigerant heater 106 cuts out.
Heat pump type air adjusting device four-way change-over valve 102 when heating operation of the first embodiment is in the second state.As shown in Figure 3, when heating operation, refrigerant circulates according to following flow direction: compressor 101 → four-way change-over valve 102 → indoor heat exchanger 110 → electric expansion valve 107 → refrigerant heater 106 → outdoor heat exchanger 103 → four-way change-over valve 102 → compressor 101.
In heating process, optionally can open refrigerant heater 106 for exporting the refrigerant heating of also i.e. outdoor heat exchanger 103 entrance to electric expansion valve 107, to suppress outdoor heat exchanger 103 frosting, and promote enthalpy and mass density that compressor 101 sucks refrigerant, promote heating effect and heating capacity, promote and heat comfort level.
The heat pump type air adjusting device of the first embodiment further comprises control device.Control device is connected with four-way change-over valve 102, refrigerant heater 106 and compressor 101.This control device switches to carry out defrost operation to outdoor heat exchanger 103 for controlling heat pump type air adjusting device between different defrost control mode.Particularly, defrost control mode can comprise the first defrosting mode and the second defrosting mode.Below the first defrosting mode and the second defrosting mode are described respectively.
First defrosting mode
Under the first defrosting mode, four-way change-over valve 102 is in the second state, and refrigerant heater 106 is opened.Refrigerant heater 106 is opened, and can give the heating of systemic circulation refrigerant, promote energy state, and avoid the risk of compressor Wet Compression, promote the reliability of compressor in defrosting operation process, and realize the operation of indoor set continuously heating, avoid indoor environment temperature to fluctuate and comfort level reduces.
As shown in Figure 4, under the first defrosting mode, refrigerant circulates according to following flow direction: compressor 101 → four-way change-over valve 102 → indoor heat exchanger 110 → electric expansion valve 107 → refrigerant heater 106 → outdoor heat exchanger 103 → four-way change-over valve 102 → compressor 101.
If control device judges that conditioner needs to enter the first defrosting mode and runs, then according to following policy control:
1) compressor 101 continuous service.Compressor 101 is preferably frequency-changeable compressor in the present embodiment, preferably adopts high frequency to run under the first defrosting mode, such as, make compressor 101 run in the frequency range of 60 to 120 hertz.
2) four-way change-over valve 102 maintains the second state making air conditioning major loop be in heating operation, need not commutate.
3) heat pump type air adjusting device also comprises outside heat exchange blower fan 104.Outside heat exchange blower motor 105 is for heat exchange blower fan 104 outside drive chamber.Control device is connected with outside heat exchange blower motor 105 opens with heat exchange blower fan 104 outside control room or closes.Control device also comprises the first temperature measuring equipment for detecting outdoor environment temperature.When the first temperature measuring equipment detects that outdoor environment temperature is greater than the first predetermined temperature, outside heat exchange blower fan 104 can be selected to continue to open, and carries out defrosting with the cross-ventilation heat transfer making full use of higher temperature in environment.When the coil temperature of outdoor heat exchanger 103 is greater than a temperature definite value, such as, be greater than 5 DEG C, heat exchange blower fan 104 outside close chamber can be selected.When the first temperature measuring equipment detects that outdoor environment temperature is less than or equal to the first predetermined temperature, outside heat exchange blower fan 104 can be chosen as closes immediately, loses to avoid the defrosting heat of outdoor heat exchanger 103 inside.This first predetermined temperature can be such as a value between 4 to 10 DEG C, is preferably 5 DEG C.
4) aperture of electric expansion valve 107 should guarantee that suitable refrigerant flow passes through, and enters outdoor heat exchanger 103 and carries out defrosting.
5) heat pump type air adjusting device also comprises indoor heat exchange blower fan 109, and indoor heat exchange blower motor 108 is for heat exchange blower fan 109 inside drive chamber.Control device is connected with indoor heat exchange blower motor 108 opens with heat exchange blower fan 109 inside control room or closes.Indoor heat exchange blower fan 109 can cut out according to the coil temperature of indoor heat exchanger 110 and run, or maintain certain wind speed operation, guarantee suitable leaving air temp, guarantee the comfortableness of indoor temperature, and guarantee that a part of heat can enter outdoor heat exchanger and carry out defrosting.Control mode can be particularly, control device also comprises the second temperature measuring equipment of the coil temperature for detecting indoor heat exchanger 110, when the second temperature measuring equipment detects that the coil temperature of indoor heat exchanger 110 is greater than the second predetermined temperature, inside control device control room, heat exchange blower fan 109 is opened.This second predetermined temperature can be such as a value between 40 to 60 DEG C, is preferably 50 DEG C.When the second temperature measuring equipment detects that the coil temperature of indoor heat exchanger 110 is less than the 3rd predetermined temperature, inside control device control room, heat exchange blower fan 109 cuts out.Wherein, the 3rd predetermined temperature should be less than or equal to the second predetermined temperature.3rd predetermined temperature can be in the value of such as between 20 to 40 DEG C, is preferably 30 DEG C.
6) refrigerant heater 106 is opened.
Second defrosting mode
Under the second defrosting mode, four-way change-over valve 102 is in the first state, and refrigerant heater 106 selectively opens or cuts out.
As shown in Figure 5, under the second defrosting mode, refrigerant circulates according to following flow direction: compressor 101 → four-way change-over valve 102 → outdoor heat exchanger 103 → refrigerant heater 106 → electric expansion valve 107 → indoor heat exchanger 110 → four-way change-over valve 102 → compressor 101.
When the outdoor heat exchanger 103 of heat pump type air adjusting device needs defrosting, preferably run under the first defrosting mode.Too low in environment temperature, such as indoor environment temperature is below 20 DEG C, when outdoor environment temperature is below-20 DEG C, or the coil temperature of outdoor heat exchanger 103 can not reach predetermined temperature value experience a period of time under the first defrosting mode after, the coil temperature such as running experience outdoor heat exchanger 103 after 8 minutes under the first defrosting mode still can not reach more than 10 DEG C, then run according to the second defrosting mode.
In order to control heat pump type air adjusting device from the first defrosting mode to the switching of the second defrosting mode, control device can also comprise the time detection device detecting the operation duration of heat pump type air adjusting device under the first defrosting mode, when time detection device detects that running duration is greater than predetermined amount of time, control device controls heat pump type air adjusting device and switches to the second defrosting mode.Certainly, predetermined amount of time 8 minutes of being not limited to exemplify, such as, also can be a value between 6 to 10 minutes herein.
If control device judges that conditioner needs to enter the second defrosting mode and runs, then according to following policy control:
1) when compressor 101 is frequency-changeable compressor; when entering the second defrosting mode, compressor 101 need run through first shutdowns, initial start-up, raising frequency high frequency (such as run in the frequency range of 60 to 120 hertz), defrosted after the process that again again starts after shutdown, the pressure balance of system high-low pressure.
2) when entering the second defrosting mode; the first state that four-way change-over valve 102 commutates as making air conditioning major loop refrigerating operaton in a period of time after compressor 101 is shut down for the first time, switches to the second state making air conditioning major loop carry out heating operation after compressor 101 shuts down a period of time again after having defrosted.
3) outside heat exchange blower fan 104 is shut down after heat pump type air adjusting device enters the second defrosting mode, to prevent the defrosting heat in outdoor heat exchanger 103 to take away.After the second defrosting mode terminates, determine whether open operation according to service condition again.
4) aperture of electric expansion valve 107 should guarantee that suitable refrigerant flow passes through, and guarantees rapid defrosting.
5) in the second defrosting mode, lower room temperature in order to preventing fast, indoor heat exchange blower fan 109 cuts out operation in the second defrosting mode.
6) refrigerant heater 106 cuts out.
In order to heat pump type air adjusting device controls refrigerant heater 106 in heating process, control device also comprises the 3rd temperature measuring equipment of the coil temperature for detecting outdoor heat exchanger 103, when the 3rd temperature measuring equipment detects that the coil temperature of outdoor heat exchanger 103 is less than or equal to predetermined 4th predetermined temperature, defrost control device controls refrigerant heater 106 and opens.4th predetermined temperature can be such as a value between-10 to-3 DEG C, is preferably-5 DEG C.
In addition, when heat pump type air adjusting device heating operation, when the 3rd temperature measuring equipment detect the coil temperature of outdoor heat exchanger 103 be less than outdoor environment temperature that the first temperature measuring equipment detects exceed predetermined temperature difference time, control device controls refrigerant heater 106 and opens.This predetermined temperature difference can be such as a value between 5 to 15 DEG C, is preferably 10 DEG C.
In addition, when heat pump type air adjusting device heating operation, when the first temperature measuring equipment detects that outdoor environment temperature is less than or equal to the 5th predetermined predetermined temperature, control device controls refrigerant heater 106 and opens.5th predetermined temperature can be such as a value between-5 to 5 DEG C, is preferably 5 DEG C.
It should be noted that, the second defrosting mode is the useful supplement to the first defrosting mode, and its effect strengthens defrosting ability under severe outdoor environmental conditions or when frost situation is more serious.But, those skilled in the art will envision that, even if above conditioner also can only adopt the first defrosting mode to carry out defrost operation, as long as the time long enough of defrost process under rugged environment condition.
According to above description, the heat pump type air adjusting device of the first embodiment, at typical condition, the first defrosting mode of defrosting while heating can be adopted, thus, under, system less at parts and simple, the cost-saving precondition of control mode, substantially realize following effect:
1) owing to can run under the first defrosting mode under common outdoor environmental conditions, the sensible heat of refrigerant namely can be utilized while heating to defrost, there is following advantage:
Four-way change-over valve does not commutate, and compressor is not shut down, and directly the high temperature refrigerant that compressor is discharged is passed into outdoor heat exchanger; thus defrosting can be realized in time rapidly; defrosting can be completed in 8 ~ 10min, because interior pipe temperature during defrosting is higher, after having defrosted, hot blast can be obtained at once.Because of compressor shutdown when adopting traditional defrosting mode, four-way change-over valve commutation and defrosting total time of causing long, a complete defrost process needs general 12 ~ 15min, and even the longer time could obtain hot blast again, larger on the impact of room comfortableness.
The interior pipe of indoor heat exchanger can maintain higher temperature, not only can not absorb the heat in room, when indoor heat exchange fan parking, can be dispelled the heat to room by the mode of free convection, in the process of defrosting, fluctuations in indoor temperature is less, larger to the comfortableness contribution in room; Also can in the process of defrosting heat exchange blower fan inside opening chamber, continue indoor room heat supply.Can avoid in conventional defrost process because the temperature of indoor heat exchanger absorbs the larger fluctuation of indoor temperature that room heat causes below-20 DEG C.
Suction temperature, the pressure of inspiration(Pi) of compressor obtain very fast lifting after entering defrosting, and be not easy to cause compressor hydraulic compression, compressor operating is more reliable.Can avoid in conventional defrost process, the compressor hydraulic compression caused because a large amount of liquid refrigerants accumulates in suction port of compressor place.
2) further, under the condition that outdoor environment is severe, the second defrosting mode (corresponding with conventional defrost pattern) can be switched to and carry out defrost operation, defrosting ability can be increased; Meanwhile, due to the cooperation adopting the second defrosting mode can have the first defrosting mode, thus omnidistancely in defrosting overall process need not adopt the second defrosting mode, the adverse effect of the second defrosting mode can be reduced to the full extent.Meanwhile, because refrigerant heater can optionally open or cut out, under the second defrosting mode, also defrosting ability can be strengthened further.
Second embodiment
The structure of the heat pump type air adjusting device of the second embodiment and control mode are as shown in Fig. 6 to Figure 10, substantially identical with the first embodiment.Therefore in the following description, the something in common of the two is no longer specifically described, only difference is described.
Be that the setting position of refrigerant heater 206 is different from the difference of the first embodiment in the heat pump type air adjusting device of the second embodiment, in second embodiment, refrigerant heater 206 is series on the refrigeration pipe between the arrival end of compressor 201 in air conditioning major loop and indoor heat exchanger 210.
The heat pump type air adjusting device of the second embodiment is when refrigerating operaton, and four-way change-over valve 202 is in the first state.As shown in Figure 7, refrigerant circulates according to following flow direction: compressor 201 → four-way change-over valve 202 → outdoor heat exchanger 203 → electric expansion valve 207 → indoor heat exchanger 210 → four-way change-over valve 202 → refrigerant heater 206 → compressor 201.Refrigerant heater 206 is in closed condition.
The heat pump type air adjusting device of the second embodiment is when heating operation, and four-way change-over valve 202 is in the second state.As shown in Figure 8, refrigerant circulates according to following flow direction: compressor 201 → four-way change-over valve 202 → indoor heat exchanger 210 → electric expansion valve 207 → outdoor heat exchanger 203 → four-way change-over valve 202 → refrigerant heater 206 → compressor 201.
In addition when heating operation, optionally can open refrigerant heater 206 for heating to the refrigerant of compressor 201 arrival end, promote the mass density that compressor 201 sucks refrigerant, promote the refrigerant temperature and heating effect that enter in indoor heat exchanger 210, and suppress outdoor heat exchanger 203 frosting.The condition of opening refrigerant heater 206 is all identical with the first embodiment with control mode.
The heat pump type air adjusting device of the second embodiment is the same with the first embodiment, also includes control device.This control device switches to carry out defrost operation to outdoor heat exchanger 203 for controlling heat pump type air adjusting device between different defrost control mode.Particularly, defrost control mode comprises the first defrosting mode and the second defrosting mode.
Under the first defrosting mode, four-way change-over valve 202 is in the second state.As shown in Figure 9, refrigerant circulates according to following flow direction: compressor 201 → four-way change-over valve 202 → indoor heat exchanger 210 → electric expansion valve 207 → outdoor heat exchanger 203 → four-way change-over valve 202 → refrigerant heater 206 → compressor 201.
In the first defrosting mode, open refrigerant heater 206 for heating to the refrigerant of compressor 201 entrance, promote the mass density that compressor 201 sucks refrigerant, promote the refrigerant temperature entering outdoor heat exchanger 203, thus acceleration defrosting, and realize indoor set continuously heating to run, avoid indoor environment temperature to fluctuate and comfort level reduces.
Under the second defrosting mode, four-way change-over valve 202 is in the first state.As shown in Figure 10, under the second defrosting mode, refrigerant circulates according to following flow direction: compressor 201 → four-way change-over valve 202 → outdoor heat exchanger 203 → electric expansion valve 207 → indoor heat exchanger 210 → four-way change-over valve 202 → refrigerant heater 206 → compressor 201.
Other not specifically described content of second embodiment, control strategy such as under the first defrosting mode and under the second defrosting mode and the switching condition of the first defrosting mode and the second defrosting mode etc., all with reference to the associated description of the first embodiment, no longer can repeat at this.
The heat pump type air adjusting device of the second embodiment is roughly the same with the technique effect of the first embodiment.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
Due to refrigerant heater of only connecting in air conditioning major loop namely can be implemented in heat while function that outdoor heat exchanger is defrosted, thus have that defroster structure is simple, the advantage of low cost of manufacture.
Under common outdoor environmental conditions; can run under the first defrosting mode; and under the first defrosting mode; the sensible heat of refrigerant can be utilized while heating to defrost; there is following advantage: four-way change-over valve does not commutate; compressor is not shut down, and directly the high temperature refrigerant that compressor is discharged is passed into outdoor heat exchanger, thus can realize defrosting in time rapidly.The interior pipe of indoor heat exchanger can maintain higher temperature, not only can not absorb the heat in room, when indoor heat exchange fan parking, can be dispelled the heat to room by the mode of free convection, in the process of defrosting, fluctuations in indoor temperature is less, larger to the comfortableness contribution in room; Also can in the process of defrosting heat exchange blower fan inside opening chamber, continue indoor room heat supply.Suction temperature, the pressure of inspiration(Pi) of compressor obtain very fast lifting after entering defrosting, and be not easy to cause compressor hydraulic compression, compressor operating is more reliable.
Under the condition that outdoor environment temperature is severe, the second defrosting mode (corresponding with conventional defrost pattern) can be adopted to carry out defrosting process, because the cooperation of the first defrosting mode can be had, and in defrost process, whole process need not adopt the second defrosting mode, also can reduce the adverse effect of the second defrosting mode to the full extent.
Further, due to refrigerant heater of connecting in air conditioning major loop, the defrost process under heating operations and the second defrosting mode also can be accelerated.
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 (10)
1. a heat pump type air adjusting device, comprising:
Air conditioning major loop, comprises the compressor (101 connected in turn by refrigeration pipe, 201), four-way change-over valve (102, 202), outdoor heat exchanger (103, 203), expansion gear (107, 207) and indoor heat exchanger (110, 210), described four-way change-over valve (102, 202) first interface and described compressor (101, 201) the port of export is communicated with, second interface and described outdoor heat exchanger (103, 203) be communicated with, 3rd interface and described indoor heat exchanger (110, 210) be communicated with, 4th interface and described compressor (101, 201) arrival end is communicated with, described four-way change-over valve (102, 202) have by described first interface and described second orifice and by described 3rd interface and described 4th orifice with make described heat pump type air adjusting device carry out refrigerating operaton the first state and by described first interface and described 3rd orifice and by described second interface and described 4th orifice with the second state making described heat pump type air adjusting device carry out heating operation,
Defroster, for carrying out defrost operation to described outdoor heat exchanger (103,203);
It is characterized in that,
Described defroster is the refrigerant heater (106,206) be connected on described air conditioning major loop;
Wherein, described heat pump type air adjusting device also comprises control device, described control device controls described heat pump type air adjusting device between different defrost control mode, switches to carry out defrost operation to described outdoor heat exchanger (103,203), and described defrost control mode comprises:
First defrosting mode, under described first defrosting mode, described four-way change-over valve (102,202) is in described second state, and described refrigerant heater (106,206) is opened;
Second defrosting mode, under described second defrosting mode, described four-way change-over valve (102,202) is in described first state, and described refrigerant heater (106,206) cuts out;
Described heat pump type air adjusting device also comprises outside heat exchange blower fan (104,204);
Described control device also comprises the first temperature measuring equipment for detecting outdoor environment temperature, under described first defrosting mode, when described first temperature measuring equipment detects that described outdoor environment temperature is greater than the first predetermined temperature, described control device controls the unlatching of described outside heat exchange blower fan (104,204), and when described outdoor environment temperature is less than or equal to described first predetermined temperature, described control device controls the closedown of described outside heat exchange blower fan (104,204).
2. heat pump type air adjusting device according to claim 1, is characterized in that, described refrigerant heater (106) is arranged between described outdoor heat exchanger (103) and described expansion gear (107).
3. heat pump type air adjusting device according to claim 1, is characterized in that, described refrigerant heater (206) is arranged between described compressor (201) arrival end and described four-way change-over valve (202).
4. heat pump type air adjusting device according to claim 1, is characterized in that,
Described heat pump type air adjusting device also comprises indoor heat exchange blower fan (109,209);
Described control device also comprises for detecting described indoor heat exchanger (110, 210) the second temperature measuring equipment of coil temperature, under described first defrosting mode, when described second temperature measuring equipment detects described indoor heat exchanger (110, 210) when coil temperature is more than or equal to the second predetermined temperature, described control device controls described indoor heat exchange blower fan (109, 209) open, described indoor heat exchanger (110 detected, 210) when coil temperature is less than the 3rd predetermined temperature, described control device controls described indoor heat exchange blower fan (109, 209) close, wherein, described 3rd predetermined temperature is less than or equal to described second predetermined temperature.
5. heat pump type air adjusting device according to claim 4, is characterized in that, described compressor (101,201) continuous service.
6. heat pump type air adjusting device according to claim 5, it is characterized in that, described compressor (101,201) is frequency-changeable compressor, and under described first defrosting mode, described compressor (101,201) runs in the frequency range of 60 to 120 hertz.
7. heat pump type air adjusting device according to claim 1, it is characterized in that, described control device also comprises the time detection device detecting the operation duration of described heat pump type air adjusting device under described first defrosting mode, when described time detection device detects that described operation duration is more than or equal to predetermined amount of time, described control device controls described heat pump type air adjusting device and switches to described second defrosting mode from described first defrosting mode.
8. heat pump type air adjusting device according to claim 1, it is characterized in that, described control device also comprises the 3rd temperature measuring equipment of the coil temperature for detecting described outdoor heat exchanger (103,203), when described heat pump type air adjusting device heating operation, when described 3rd temperature measuring equipment detects that the coil temperature of described outdoor heat exchanger (103,203) is less than or equal to the 4th predetermined temperature, described control device controls described refrigerant heater (106,206) and opens.
9. heat pump type air adjusting device according to claim 1, it is characterized in that, described control device also comprises the first temperature measuring equipment for detecting outdoor environment temperature and for detecting described outdoor heat exchanger (103, 203) the 3rd temperature measuring equipment of coil temperature, when described heat pump type air adjusting device heating operation, when described 3rd temperature measuring equipment detects that the difference that described outdoor heat exchanger coil temperature is less than the described outdoor environment temperature that described first temperature measuring equipment detects exceedes predetermined temperature difference, described control device controls described refrigerant heater (106, 206) open.
10. heat pump type air adjusting device according to claim 1, it is characterized in that, described control device also comprises the first temperature measuring equipment for detecting outdoor environment temperature, when described heat pump type air adjusting device heating operation, when described first temperature measuring equipment detects that described outdoor environment temperature is less than or equal to the 5th predetermined temperature, described control device controls described refrigerant heater (106,206) and opens.
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| CN106247479A (en) * | 2016-10-09 | 2016-12-21 | 江苏心日源建筑节能科技股份有限公司 | Air-conditioner outdoor unit and there is its air-conditioning |
| CN106765673B (en) * | 2016-11-30 | 2020-09-25 | 美的集团武汉制冷设备有限公司 | Heat pump system and defrosting control method thereof |
| CN106369877A (en) * | 2016-11-30 | 2017-02-01 | 广东美的制冷设备有限公司 | Heat pump system and defrosting control method thereof |
| CN106705302B (en) * | 2017-01-10 | 2019-07-19 | 美的集团武汉制冷设备有限公司 | Air conditioner, defrosting control method and defrosting control system |
| CN106642595A (en) * | 2017-01-10 | 2017-05-10 | 美的集团武汉制冷设备有限公司 | Air conditioner and defrosting control method thereof |
| CN109323477B (en) | 2018-09-11 | 2020-05-19 | 西安交通大学 | Transcritical CO based on take precooler2Heat pump system and water path two-way valve control method thereof |
| CN110469966A (en) * | 2019-07-24 | 2019-11-19 | 青岛海尔空调器有限总公司 | For the control method of air-conditioner defrosting, device and air-conditioning |
| CN110469968B (en) * | 2019-07-24 | 2022-05-31 | 重庆海尔空调器有限公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN110469969B (en) * | 2019-07-25 | 2022-09-06 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN110736214B (en) * | 2019-09-27 | 2021-11-23 | 青岛海尔空调器有限总公司 | Control method and control device for defrosting of air conditioner and air conditioner |
| CN111503823A (en) * | 2020-04-29 | 2020-08-07 | 广东美的制冷设备有限公司 | Control method of air conditioning system and air conditioning system |
| CN112628941B (en) * | 2020-12-11 | 2022-02-18 | 珠海格力电器股份有限公司 | Air conditioner defrosting control method and device, storage medium and air conditioner |
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