CN105202792A - Jet enthalpy increasing system, air conditioning unit with system and enthalpy increasing control method - Google Patents
Jet enthalpy increasing system, air conditioning unit with system and enthalpy increasing control method Download PDFInfo
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- CN105202792A CN105202792A CN201510671190.4A CN201510671190A CN105202792A CN 105202792 A CN105202792 A CN 105202792A CN 201510671190 A CN201510671190 A CN 201510671190A CN 105202792 A CN105202792 A CN 105202792A
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Abstract
The invention provides a jet enthalpy increasing system which comprises a compressor (1), a condenser (2) connected with a compressor outlet (11), and a flash evaporator (3) connected with a condenser outlet (21), wherein the flash evaporator (3) also comprises a first outlet (31) which is connected to a secondary inlet (12) of the compressor; and at least one first expansion valve (4) is arranged between the secondary inlet (12) and the first outlet (31) of the flash evaporator. The jet enthalpy increasing system can effectively prevent the refrigerant from backflow, enhances the stability of the air conditioning unit and especially the heat pump system, can not influence the normal stable operation of the air conditioning unit and especially the heat pump system, can effectively enhance the enthalpy value increment on the basis of the original system, and effectively increases the sum of the system internal energy and external volume work application capacity. The invention also provides an air conditioning unit with the system and an enthalpy increasing control method.
Description
Technical field
The invention belongs to refrigeration and air-conditioning technical field, be specifically related to a kind of air injection enthalpy-increasing system, the spray enthalpy control method of the compressor of band spray enthalpy function, and there is the air-conditioner set of air injection enthalpy-increasing system.
Background technology
The air-conditioner set of existing routine often sets up a flash vessel in the intermediate duct of kind of refrigeration cycle in order to the effective enthalpy increasing machine set system, fill in compressor again after some refrigerant is evaporated, and then the effect that tonifying Qi increases enthalpy is played to the cold-producing medium in compressor.But often when pressure higher than this flash vessel exit of the pressure of compressor Pen Han import department, some refrigerant can exist the situation of reverse counterflow, so that flow backwards and enter in flash vessel, seriously reduce performance and the stability of air-conditioner set.
In order to the situation preventing the cold-producing medium of compressor Pen Han import department from occurring adverse current, can consider that arranging one in compressor spray enthalpy import and flash vessel gas outlet tube section sprays enthalpy magnetic valve, as shown in Figure 1, spraying enthalpy magnetic valve mainly relies on the judgement relation of spray enthalpy temperature and flasher temperature whether to decide to spray the unlatching of enthalpy magnetic valve.But it still exists following shortcoming: due to the delay of temperature-sensitive bag temperature-sensitive, the requirement of sampling time interval, inevitably will occur not close spray enthalpy magnetic valve in time, thus cause compressor spray enthalpy mouth place cold-producing medium to flow back to the situation of flash vessel; Meanwhile, under conventional magnetic valve exists cut out situation, still there is situation about oppositely revealing, to such an extent as to seriously can reduce the performance of heat pump, affect the operation stability of heat pump.
Therefore flow backwards thus the serious performance reducing heat pump owing to there is cold-producing medium in above-mentioned existing system, affect the defect of the operation stability of heat pump, research and design of the present invention goes out a kind of new air injection enthalpy-increasing system, has the air-conditioner set of this system and this increasing enthalpy control method.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is to overcome in prior art exists cold-producing medium refluence thus the serious performance reducing heat pump, affect the defect of the operation stability of heat pump, thus a kind of new air injection enthalpy-increasing system is provided, there is the air-conditioner set of this system and this increasing enthalpy control method.
A kind of air injection enthalpy-increasing system provided by the invention, the condenser comprise compressor, being connected with described compressor outlet, it also comprises the flash vessel be connected with described condensator outlet, described flash vessel also comprises the first outlet, this first outlet is connected to the secondary inlet of described compressor, is also provided with the first expansion valve of at least one between first of described secondary inlet and described flash vessel exports.
Preferably, described first expansion valve is electric expansion valve.
Preferably, described first expansion valve is more than 2 or 2.
Preferably, the inlet tube section of described flash vessel is provided with flash vessel temperature-sensitive bag.
Preferably, the outlet section of described first expansion valve is provided with spray enthalpy temperature-sensitive bag.
The present invention also provides a kind of air-conditioner set, it comprises aforesaid air injection enthalpy-increasing system, and it also comprises the second expansion valve be arranged between described flash vessel and described condenser on pipeline and the evaporimeter be arranged between the second outlet of described flash vessel and described compressor on pipeline.
Preferably, the 3rd expansion valve be arranged between the second outlet of described flash vessel and evaporimeter is also comprised.
Preferably, the cross valve being arranged on described compressor outlet is also comprised.
Preferably, described air-conditioner set is source pump.
The present invention also provides a kind of air injection enthalpy-increasing control method, and it comprises aforesaid air injection enthalpy-increasing system.
Preferably, the temperature gap between the temperature T0 that detects with the temperature T1 spraying enthalpy temperature-sensitive bag and detect and flash vessel temperature-sensitive bag of described first expansion valve is for controlled condition.
Preferably, it comprises step:
When system cloud gray model meets filling, spray enthalpy electric expansion valve controls as follows:
(1) when T1-T0<=t1 DEG C being detected, then spray enthalpy electronic expansion valve opening and be adjusted to maximum;
(2) when T1-T0>=t2 DEG C being detected, then spray enthalpy electronic expansion valve opening and be adjusted to minimum;
(3) when t1<T1-T0<t2 DEG C being detected, the aperture=480-k (T1-T0) of spray enthalpy electric expansion valve, wherein t1, t2 are setting reduced temperature, and k is correction factor.
Preferably, the span of described k is 90<=k<=110.
Preferably, when system cloud gray model does not meet filling, spray enthalpy electronic expansion valve opening closes to minimum.
A kind of air injection enthalpy-increasing system provided by the invention has following beneficial effect:
1. according to air injection enthalpy-increasing system of the present invention, can effectively prevent cold-producing medium from flowing backwards, thus effectively improve the stability of air-conditioner set especially heat pump, be unlikely to affect the operation of air-conditioner set especially heat pump normal table.
2., according to air injection enthalpy-increasing system of the present invention, on the basis of original system, effectively can also improve the increment of its enthalpy, namely to effectively increase in system can with its externally do the ability of volumetric work and value.
Accompanying drawing explanation
Fig. 1 is the structural representation with the air-conditioner set of spray enthalpy system adopting spray enthalpy magnetic valve.
Fig. 2 is the structural representation of air injection enthalpy-increasing system of the present invention and the air-conditioner set with this system.
In figure, Reference numeral is expressed as:
1-compressor, 11-compressor outlet, the secondary inlet of 12-compressor, 2-condenser, 21-condensator outlet, 3-flash vessel, 31-the first outlet, the import of 32-flash vessel, the 33-the second outlet, 40-magnetic valve, the 4-the first expansion valve, 41-electric expansion valve, 5-flash vessel temperature-sensitive bag, 6-spray enthalpy temperature-sensitive bag, the 7-the second expansion valve, 8-evaporimeter, the 9-the three expansion valve, 10-cross valve.
Detailed description of the invention
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 2, a kind of air injection enthalpy-increasing system provided by the invention, the condenser 2 comprise compressor 1, being connected with described compressor outlet 11, it also comprises the flash vessel 3 be connected with described condensator outlet 21, described flash vessel 3 also comprises the first outlet 31, the secondary inlet 12 that this first outlet 31 is connected to described compressor, first of described secondary inlet 12 and described flash vessel exports the first expansion valve 4 being also provided with at least one between 31.Preferably described expansion valve 4 is spray enthalpy expansion valve.According to air injection enthalpy-increasing system of the present invention, by replacing with expansion valve by being arranged on flash vessel first magnetic valve exported between 31 and the secondary inlet 12 of compressor in prior art, because expansion valve has the function (cutoff function preventing fluid countercurrent current relative to magnetic valve, the electric expansion valve generally possessing cutoff function has this function, and be when closing, some electric expansion valve in off position under also can exist low discharge circulation situation), namely only to allow that fluid is unidirectional carries out volume increase by this valve, the expansion process (being generally speaking isenthalpic expansion) that pressure reduces, can effectively prevent cold-producing medium from flowing backwards, precisely prevent the cold-producing medium that compressor sprays enthalpy mouth (secondary inlet 12) from flowing back to flash vessel, thus effectively can improve the stability of a system of air-conditioner set especially heat pump, be unlikely to affect the operation of air-conditioner set especially heat pump normal table.
Be arranged on the expansion valve that flash vessel first exports 31 sections and (be generally constant enthalpy step-down) by of the present invention to after cold-producing medium pressure release, enter in compressor under being compressed into same pressure condition again, have and do not raise to some extent through the situation enthalpy of pressure release expansion process than original, namely adopt technological means of the present invention on the basis of original system, effectively can also improve the increment of its enthalpy, namely to effectively increase in system can with its externally do the ability of volumetric work and value.
Preferably, described first expansion valve 4 is electric expansion valve 41.Because electric expansion valve has the advantages such as flow adjustment range is large, degree of regulation is high, power saving relative to heating power expansion valve etc., electric expansion valve is therefore adopted more accurately, efficiently to regulate flow on a large scale.
Preferably, described first expansion valve 4 is more than 2 or 2.Adopt first expansion valve 4 of more than 2 or 2 more accurately can regulate refrigerant flow, carry out puffing to it, accurately reach the object of pressure release, and can also prevent cold-producing medium from flowing back to flash vessel from compressor spray enthalpy mouth better.
Preferably, import 32 line segments of described flash vessel 3 is provided with flash vessel temperature-sensitive bag 5.The temperature at flash vessel 3 import 32 place can being detected by this flash vessel temperature-sensitive bag 5 exactly, providing condition for realizing spray enthalpy regulable control.
Preferably, outlet 42 line segments of described first expansion valve 4 is provided with spray enthalpy temperature-sensitive bag 6.Can detecting by this spray enthalpy temperature-sensitive bag 6 temperature that first expansion valve 4 exports 42 places exactly, providing condition for realizing spray enthalpy regulable control.
The present invention also provides a kind of air-conditioner set, it comprises aforesaid air injection enthalpy-increasing system, and it also comprises the second expansion valve 7 be arranged between described flash vessel 3 and described condenser 2 on pipeline and the evaporimeter 8 be arranged between the second outlet 33 of described flash vessel 3 and described compressor 1 on pipeline.By replacing with expansion valve by being arranged on flash vessel first magnetic valve exported between 31 and the secondary inlet 12 of compressor in prior art, can effectively prevent cold-producing medium from flowing backwards, precisely prevent the cold-producing medium that compressor sprays enthalpy mouth (secondary inlet 12) from flowing back to flash vessel, thus effectively can improve the stability of a system of air-conditioner set, be unlikely to the operation affecting air-conditioner set normal table.
Can effectively ensure to make cold-producing medium to be absorbed heat (be generally isobaric and increase enthalpy process) first entering flash vessel 2 after condenser 2 heat release after one section of throttling expansion (being generally constant enthalpy pressure reduction) again by the pipeline between described flash vessel 3 and described condenser 2 being arranged the second expansion valve 7, enter again in compressor and compressed (adherence pressure and enthalpy), thus effectively can increase the enthalpy of cold-producing medium, achieve the effect of air injection enthalpy-increasing; By between second outlet 33 and described compressor 1 of described flash vessel 3, pipeline is arranged evaporimeter 8 can to flash vessel 3 in the cold-producing medium of failing to be evaporated by absorbing heat carry out evaporation endothermic, lower the temperature to needing the space of freezing, then return into compressor, form a complete kind of refrigeration cycle.
Preferably, the 3rd expansion valve 9 be arranged between the second outlet 33 of described flash vessel 3 and evaporimeter 8 is also comprised.The cold-producing medium not being flashed device heat absorption evaporation to expanding through the second expansion valve 7 partial throttling carries out further throttling expansion, to reach the precondition (saturated vapor pressure and saturation temperature etc.) of evaporation endothermic.
Preferably, the cross valve 10 being arranged on described compressor outlet 11 end is also comprised.Described cross valve 10 is connected in order to be exported with described evaporimeter 8 suction port of compressor 12, and is connected by the entrance of compressor outlet 11 with described condenser 2, to form a complete kind of refrigeration cycle.
Preferably, described air-conditioner set is source pump, for requisite space provides heat (condensation heat release).
The present invention also provides a kind of air injection enthalpy-increasing control method, and it comprises aforesaid air injection enthalpy-increasing system.By replacing with expansion valve by being arranged on flash vessel first magnetic valve exported between 31 and the secondary inlet 12 of compressor in prior art, can effectively prevent cold-producing medium from flowing backwards, precisely prevent the cold-producing medium that compressor sprays enthalpy mouth (secondary inlet 12) from flowing back to flash vessel, thus effectively can improve the stability of a system of air-conditioner set, be unlikely to the operation affecting air-conditioner set normal table.
Preferably, the temperature gap between the temperature T0 that detects with the temperature T1 spraying enthalpy temperature-sensitive bag 6 and detect and flash vessel temperature-sensitive bag 5 of described first expansion valve 4 is for controlled condition.Compared by the temperature at this two place thus carry out corresponding regulable control for the first expansion valve.
Preferably include step:
Under system cloud gray model meets the situation (control program judges whether filling according to operating states of the units) of filling, spray enthalpy electric expansion valve 41 controls as follows:
(1) when T1-T0<=t1 DEG C being detected, then spray enthalpy electric expansion valve 41 aperture and be adjusted to maximum (i.e. standard-sized sheet); Now illustrate that the heat absorption increasing enthalpy effect through flash vessel is obvious hardly, the desired value of specifying is reached by the refrigerant pressure after compressing and enthalpy in order to make to enter compressor, then need the carrying out carrying out strengthening throttling expansion effect, namely need spray enthalpy electric expansion valve 41 aperture to be adjusted to maximum (i.e. standard-sized sheet), required requirement can be reached.The value of preferably getting t1 is here 0.
(2) when T1-T0>=t2 DEG C being detected, then spray enthalpy electronic expansion valve opening and be adjusted to minimum (i.e. complete shut-down); Now illustrate that the heat absorption increasing enthalpy effect through flash vessel has has met or exceeded target call, now do not need namely can to make to enter compressor through throttling expansion effect and reached the desired value of specifying by the refrigerant pressure after compressing and enthalpy, therefore spray enthalpy electronic expansion valve opening and be adjusted to minimum (i.e. complete shut-down).The value of preferably getting t2 is here 5.
(3) when t1<T1-T0<t2 DEG C being detected, the aperture=480-k (T1-T0) of spray enthalpy electric expansion valve, then performs according to maximum opening when the target aperture calculated exceedes maximum opening; Then perform according to minimum aperture when being less than minimum aperture.Wherein t1, t2 are setting reduced temperature, and k is correction factor.Now illustrate that the heat absorption through flash vessel increases enthalpy effect between (1) and (2) kind situation, need to carry out throttling expansion to it, but the aperture of the electric expansion valve of throttling expansion should meet relation aperture=480-k (T1-T0), just can make to enter compressor and be reached the desired value of specifying by the refrigerant pressure after compressing and enthalpy.Above-mentioned relation formula has been through that a large amount of experiments and research draws, is to have novelty and creationary.The value of preferably getting t1 is here the value of 0, t2 is 5.
Preferably, the span of described k is 90<=k<=110, more preferably 96.
Preferably, when system cloud gray model does not meet filling (according to operating states of the units, control program judges that unit should filling), spray enthalpy electronic expansion valve opening closes and flows backwards to prevent cold-producing medium to minimum (complete shut-down).Whether filling, is just to allow when will meet certain, after such as compressor operating a period of time, after patten transformation a period of time, that is, time large change occurs operating states of the units, usually do not carry out filling operation.At this time the pressure oscillation of compressor, system is larger, is just not suitable for filling, now can there is the situation of refluence, and adopting and closing electric expansion valve is completely safest way.Also can there is situation about flowing backwards when filling, be closed gradually by the aperture of the sub-expansion valve of automatic control electric, realize closing to prevent from flowing backwards.
Those skilled in the art will readily understand, under the prerequisite of not conflicting, above-mentioned each advantageous manner freely can combine, superpose.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (14)
1. an air injection enthalpy-increasing system, the condenser (2) comprise compressor (1), being connected with described compressor outlet (11), it is characterized in that: also comprise the flash vessel (3) be connected with described condensator outlet (21), described flash vessel (3) also comprises the first outlet (31), this first outlet (31) is connected to the secondary inlet (12) of described compressor, and first of described secondary inlet (12) and described flash vessel exports the first expansion valve (4) being also provided with at least one between (31).
2. a kind of air injection enthalpy-increasing system according to claim 1, is characterized in that: described first expansion valve (4) is electric expansion valve (41).
3. according to a kind of air injection enthalpy-increasing system one of claim 1-2 Suo Shu, it is characterized in that: described first expansion valve (4) is more than 2 or 2.
4. according to a kind of air injection enthalpy-increasing system one of claim 1-3 Suo Shu, it is characterized in that: in import (32) line segments of described flash vessel (3), be provided with flash vessel temperature-sensitive bag (5).
5. according to a kind of air injection enthalpy-increasing system one of claim 1-4 Suo Shu, it is characterized in that: in outlet (42) line segments of described first expansion valve (4), be provided with spray enthalpy temperature-sensitive bag (6).
6. an air-conditioner set, it is characterized in that: comprise the air injection enthalpy-increasing system any one of claim 1-5, it also comprises the second expansion valve (7) be arranged between described flash vessel (3) and described condenser (2) on pipeline and the evaporimeter (8) be arranged between the second outlet (33) of described flash vessel (3) and described compressor (1) on pipeline.
7. a kind of air-conditioner set according to claim 6, is characterized in that: also comprise the 3rd expansion valve (9) be arranged between the second outlet (33) of described flash vessel (3) and evaporimeter (8).
8. according to a kind of air-conditioner set one of claim 6-7 Suo Shu, it is characterized in that: also comprise the cross valve (10) being arranged on described compressor outlet (11) and holding.
9. according to a kind of air-conditioner set one of claim 6-8 Suo Shu, it is characterized in that: described air-conditioner set is source pump.
10. an air injection enthalpy-increasing control method, is characterized in that: utilize the described air injection enthalpy-increasing system of one of claim 1-5 to carry out air injection enthalpy-increasing control to compressor.
11. a kind of air injection enthalpy-increasing control methods according to claim 10, is characterized in that: the temperature gap between the temperature T0 that described first expansion valve (4) detects with the temperature T1 spraying enthalpy temperature-sensitive bag (6) and detect and flash vessel temperature-sensitive bag (5) is for controlled condition.
12. a kind of air injection enthalpy-increasing control methods according to claim 11, is characterized in that comprising step:
When system cloud gray model meets filling, spray enthalpy electric expansion valve controls as follows:
(1) when T1-T0<=t1 DEG C being detected, then spray enthalpy electronic expansion valve opening and be adjusted to maximum;
(2) when T1-T0>=t2 DEG C being detected, then spray enthalpy electronic expansion valve opening and be adjusted to closedown;
(3) when t1<T1-T0<t2 DEG C being detected, regulate the aperture=480-k (T1-T0) of spray enthalpy electric expansion valve, wherein t1, t2 are setting reduced temperature, and k is correction factor.
13. a kind of air injection enthalpy-increasing control methods according to claim 12, is characterized in that: the span of described k is 90<=k<=110.
14. a kind of air injection enthalpy-increasing control methods according to claim 11, is characterized in that: when system cloud gray model does not meet filling, and spray enthalpy electronic expansion valve opening is adjusted to closedown.
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| CN106969563A (en) * | 2017-03-22 | 2017-07-21 | 美的集团武汉制冷设备有限公司 | Compression set, temprature control method and air conditioner with second vapor injection |
| CN107192158A (en) * | 2017-06-12 | 2017-09-22 | 珠海格力电器股份有限公司 | Air conditioner increasing enthalpy system and the air-conditioner with fixed frequency with it |
| CN109094324A (en) * | 2018-07-17 | 2018-12-28 | 蔚来汽车有限公司 | Automobile, air-conditioning system and its control method |
| CN109445476A (en) * | 2018-10-10 | 2019-03-08 | 珠海格力电器股份有限公司 | A kind of enthalpy difference laboratory nozzle autocontrol method |
| CN111426037A (en) * | 2020-04-03 | 2020-07-17 | 广东美的暖通设备有限公司 | Air conditioner, operation control method of air conditioner, and readable storage medium |
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