CN101666561A - Refrigerating and air-conditioning plant - Google Patents
Refrigerating and air-conditioning plant Download PDFInfo
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- CN101666561A CN101666561A CN200910169183A CN200910169183A CN101666561A CN 101666561 A CN101666561 A CN 101666561A CN 200910169183 A CN200910169183 A CN 200910169183A CN 200910169183 A CN200910169183 A CN 200910169183A CN 101666561 A CN101666561 A CN 101666561A
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Abstract
The invention aims at obtaining a refrigerating and air-conditioning plant which enables the heating capacity inside to be higher than the current gas injection cycle and can bring the heating capacity into full play even in the cold areas where the temperature of the external gas is below minus 10 DEG C. The plant connects a compressor (3), an indoor heat exchanger (6), a first pressure-reducingplant (11) and an external heat exchanger (12) into a ring shape and carries out heating by using the indoor heat exchanger. The plant is provided with a first internal heat exchanger (9), a spray circuit (13), a pressure-reducing plant for spraying (14) and a second internal heat exchanger (10). The first internal heat exchanger (9) is used for carrying out heat exchange on the refrigerant between the indoor heat exchanger and the first pressure-reducing plant and on the refrigerant between the external heat exchanger and the compressor. The spray circuit (13) is used for shunting part of therefrigerant between the indoor heat exchanger and the first pressure-reducing plant and spraying toward a compression chamber in the compressor. The pressure-reducing plant for spraying (14) is arranged on the spray circuit and the second internal heat exchanger (10) is used for carrying out heat exchange on the refrigerant undergoing pressure reducing carried out by the pressure-reducing plant for spraying and on the refrigerant between the indoor heat exchanger and the first pressure-reducing plant.
Description
The application of this division is based on that application number is 200680000916.0, the applying date is on March 27th, 2006, and denomination of invention is please in the division of Chinese patent application of " refrigerating air-conditioning ".
Technical field
The present invention relates to refrigerating air-conditioning, especially carry out the refrigerating air-conditioning of gas injection, the heating capacity when raising extraneous gas temperature is low.
Background technology
Existing refrigerating air-conditioning, middle splenium branch between condenser and evaporimeter is provided with gas-liquid separator, the gas refrigerant of gas-liquid separator separates is sprayed to the middle splenium branch of compressor, improve heating capacity (for example with reference to patent documentation 1) with this.
And, also exist after carrying out heat exchange with the high pressure liquid cold-producing medium after a part of high pressure liquid cold-producing medium shunting, the decompression, making its boil-off gasization and spray to compressor, with this refrigerating air-conditioning that improves heating capacity, be used for replacing gas-liquid separator (for example with reference to patent documentation 2).
And, the device (for example with reference to patent documentation 3) that the cold-producing medium that also have middle splenium branch between condenser and evaporimeter that liquid memory is set, cold-producing medium in the liquid memory and compressor is sucked carries out heat exchange.
Patent documentation 1: TOHKEMY 2001-304714 communique
Patent documentation 2: TOHKEMY 2000-274859 communique
Patent documentation 3: TOHKEMY 2001-174091 communique
Summary of the invention
But existing refrigerating air-conditioning has following problem.
At first, be provided with like that in patent documentation 1 described conventional example under the situation of injection of gas-liquid separator, liquid measure in the gas-liquid separator changes according to emitted dose, and the distribution of the liquid refrigerating dosage in the freeze cycle changes thereupon, has the running problem of unstable.
Gas refrigeration agent flux in the two phase refrigerant of gas refrigeration agent flux that sprays and inflow gas-liquid separator keeps under the situation of balance, have only liquid refrigerant to flow out to vaporizer side, though the liquid refrigerating dosage in the gas-liquid separator is stable, the refrigerant flow that sprays reduces.If this refrigerant flow is less than the gas refrigeration agent flux that flows into gas-liquid separator, then form the running that gas refrigerant also flows out to vaporizer side, gas flows out from the gas-liquid separator bottom, therefore forms the running that the liquid in the gas-liquid separator almost all flows out.
On the contrary, if the refrigerant flow that sprays increases, gas refrigerant deficiency then, therefore forming liquid refrigerant is mixed into state injected in the gas refrigerant, and liquid flows out from the gas-liquid separator top, so the liquid in the gas-liquid separator almost is full.
Because injection flow changes according to high-low pressure or the pressure of gas-liquid separator and the running capacity of compressor etc. of freeze cycle easily, therefore, injection flow keeps balance with the gas refrigeration agent flux that flows into gas-liquid separator hardly, in fact the liquid refrigerating dosage in the gas-liquid separator is almost nil or become full state, and the refrigerant amount in the gas-liquid separator changes according to working order easily.Refrigerant amount in its result, freeze cycle distributes and changes, and it is unstable that running takes place easily.
Conventional example described in patent documentation 2, if adopt the form that a part of high pressure liquid refrigerant is shunted, sprayed, owing to do not have fluid storage portion, therefore can solve along with the caused running of the variation of the refrigerant amount in such gas-liquid separator is unstable.But, adopt such form also to have following problem.
In general, in carrying out the freeze cycle that gas sprays, injection flow is increased, thus along with discharge from compressor, the increase of the refrigerant flow of inflow indoor heat exchanger, heating capacity also increases.
But, in case increase injection flow, then liquid refrigerant also the entrained gas cold-producing medium spray because the compressor discharge temperature reduces, the refrigerant temperature of indoor heat converter inlet also reduces, the heat-exchange capacity of indoor heat converter descends.Therefore, there is the injection flow that forms maximum heating capacity because of the balance that keeps refrigerant flow and heat-exchange capacity.
In common air heat source formula heat pump refrigerating air-conditioning, exist in extraneous gas and be that subzero cold district, heating capacity below 10 ℃ reduces and the situation that can't carry out sufficient warming operation, thereby needs can be brought into play the device of more heating capacity, but in above-mentioned gas spraying cycle, because heating capacity has the limit, therefore has the problem that fully to carry out warming operation.
And in the conventional example described in the patent documentation 3, its loop structure does not work to increasing heating capacity yet, has the problem that reduces, can not carry out sufficient warming operation in the heating capacity of cold district equally.
The present invention is to obtain making the heating capacity in the refrigerating air-conditioning to be higher than existing gas spraying cycle in view of above-mentioned problem, purpose, even externally gas is the refrigerating air-conditioning that subzero cold district below 10 ℃ also can be given full play to heating capacity.
Refrigerating air-conditioning of the present invention is with compressor, indoor heat converter, first decompressor, outdoor heat converter connects into annular, from the heating of above-mentioned indoor heat converter, has first inner heat exchanger that the cold-producing medium between above-mentioned indoor heat converter and above-mentioned first decompressor and the cold-producing medium between above-mentioned outdoor heat converter and the above-mentioned compressor are carried out heat exchange, the part of the cold-producing medium between above-mentioned indoor heat converter and above-mentioned first decompressor shunted and spray circuits that the discharge chambe in above-mentioned compressor sprays, be arranged on the injection decompressor on this spray circuits, and to having passed through second inner heat exchanger that this injection is carried out heat exchange with the cold-producing medium and the cold-producing medium between above-mentioned indoor heat converter and above-mentioned first decompressor of decompressor decompression.
According to aforesaid the present invention, with compressor, indoor heat converter, first decompressor, outdoor heat converter connects into annular, carry out under the situation of the warming operation of above-mentioned indoor heat converter heating, by using first inner heat exchanger that the cold-producing medium between the indoor heat converter and first decompressor and the cold-producing medium between outdoor heat converter and the compressor are carried out heat exchange to add the cold-producing medium that thermocompressor sucks, increase the refrigerant flow that the discharge chambe in compressor sprays even the part of the cold-producing medium between the indoor heat converter and first decompressor shunted, also can suppress the reduction of the discharge temperature of compressor, the sufficient heat exchange performance of performance in indoor heat converter, even thereby because low extraneous gas condition etc., under the condition that heating capacity reduces easily, also can guarantee sufficient heating capacity, and, utilization is sprayed second inner heat exchanger that cold-producing medium and cold-producing medium between the indoor heat converter and first decompressor with the decompressor decompression carry out heat exchange to having passed through, when the cold-producing medium of gas injection is carried out in supply, by not relying on gas-liquid separator, the cold-producing medium gasification that to be shunted is supplied with, and has the liquid measure of avoiding using gas-liquid separator to produce and changes, can realize the effect of the running of more stable device.
Description of drawings
Fig. 1 is the refrigerant loop figure of the refrigerating air-conditioning of expression first embodiment of the present invention.
Fig. 2 is the PH line chart of the operational situation of this refrigerating air-conditioning of expression when carrying out warming operation.
Fig. 3 is the PH line chart of the operational situation of this refrigerating air-conditioning of expression when carrying out cooling operation.
Fig. 4 is the flow chart of the control action of this refrigerating air-conditioning of expression when carrying out warming operation.
Fig. 5 is the flow chart of the control action of this refrigerating air-conditioning of expression when carrying out cooling operation.
Fig. 6 is the PH line chart that this refrigerating air-conditioning of expression carries out the operational situation of gas when spraying.
Fig. 7 is the figure that this refrigerating air-conditioning of expression carries out the variations in temperature of the condenser of gas when spraying.
Fig. 8 is the figure of the service performance of the gas injection flow of this refrigerating air-conditioning of expression when changing.
Fig. 9 is whether expression has the different service performance that first inner heat exchanger forms according to this refrigerating air-conditioning figure.
Figure 10 is the gas injection flow of this refrigerating air-conditioning of expression other figure of service performance when changing.
Figure 11 is the refrigerant loop figure of the refrigerating air-conditioning of expression second embodiment of the present invention.
The specific embodiment
First embodiment
Fig. 1 is the refrigerant loop figure of the refrigerating air-conditioning of expression first embodiment of the present invention.
In Fig. 1, the 3rd expansion valve 14 with decompressor is sprayed in cross valve 4, outdoor heat converter 12, first expansion valve 11 as decompressor, second inner heat exchanger 10, first inner heat exchanger 9, second expansion valve 8 as decompressor, spray circuits 13, the conduct of the running conversion that is mounted with compressor 3 in off-premises station 1, heats and freezes.
And first expansion valve 11, second expansion valve 8 and the 3rd expansion valve 14 are the electric expansion valves that aperture carried out variable control.And outdoor heat converter 12 carries out heat exchange with the extraneous gas that utilizes air-supply such as air blast.
Measuring and controlling 15 and each temperature sensor 16 are set in off-premises station 1.The suction side that temperature sensor 16a is arranged on the refrigerant flow path of the pars intermedia that discharge side, temperature sensor 16b are arranged between outdoor heat converter 12 and the cross valve 4, temperature sensor 16c is arranged on outdoor heat converter 12 of compressor 3, temperature sensor 16d is arranged between the outdoor heat converter 12 and first expansion valve 11, temperature sensor 16e is arranged between first inner heat exchanger 9 and second expansion valve 8, temperature sensor 16f is arranged on compressor 3 is measured the refrigerant temperature that the position is set respectively.And temperature sensor 16g measures the extraneous gas temperature around the off-premises station 1.
And the measuring and controlling 15 in the off-premises station 1 is according to the metrical information of temperature sensor 16 and control the air output of air blast of stream conversion, outdoor heat converter 12 of method of operation, the cross valve 4 of compressor 3 and the aperture of each expansion valve etc. from the running content of refrigerating air-conditioning user indication.
Below the running in this refrigerating air-conditioning action is described.
At first, the PH line chart during according to Fig. 1 and warming operation shown in Figure 2, the action during to warming operation describes.
When carrying out warming operation, the stream of cross valve 4 is configured to the solid line direction of Fig. 1.The gas refrigerant (point 1 of Fig. 2) of the HTHP of discharging from compressor 3 flows to off-premises station 1, flows into indoor sets 2 through flue 5 through cross valve 4.Inflow indoor heat exchanger 6 then, in the indoor heat converter 6 that becomes condenser one side dispel the heat a condensation liquefaction, become the liquid refrigerant (point 2 of Fig. 2) of high pressure low temperature.The load side medium of empty G﹠W by the heat supply load side that will discharge from cold-producing medium etc. heats.
After the cold-producing medium of the high pressure low temperature that flows out from indoor heat converter 6 flows into off-premises station 1 through liquid line 7, some decompression backs (point 3 of Fig. 2) of process in second expansion valve 8, in first inner heat exchanger 9, supply with heat, thereby be cooled (point 4 of Fig. 2) to the low-temperature refrigerant that is inhaled into compressor 3.
Then, after part of refrigerant is diverted to spray circuits 13, in second inner heat exchanger 10, carry out heat exchange with being divided to spray circuits 13 and in the 3rd expansion valve 14, being depressurized and becoming refrigerant of low temperature, thereby be further cooled (point 5 of Fig. 2).Afterwards, cold-producing medium is depressurized to low pressure at first expansion valve 11, becomes two phase refrigerant (point 6 of Fig. 2), flows into the outdoor heat converter 12 as evaporimeter afterwards, in this heat absorption, carry out boil-off gasization (point 7 of Fig. 2).Then, pass through cross valve 4, carry out heat exchange with high-pressure refrigerant, be further heated (point 8 of Fig. 2), be inhaled into compressor 3 at first inner heat exchanger 9.
On the other hand, the cold-producing medium that is divided to spray circuits 13 is pressed by the 3rd expansion valve 14 centre of reducing pressure, become the two phase refrigerant (point 9 of Fig. 2) of low temperature, in second inner heat exchanger 10, carry out heat exchange afterwards, be heated (point 10 of Fig. 2), sprayed to compressor 3 with high-pressure refrigerant.
In compressor 3 inside, after pressure and the heating (point 11 of Fig. 2), the cold-producing medium interflow with injected reduced back (point 12 of Fig. 2) in temperature, is compressed to high pressure, discharge (point 1 of Fig. 2) in the middle of the cold-producing medium of suction (point 8 of Fig. 2) was compressed to.
Following PH line chart during according to Fig. 1 and cooling operation shown in Figure 3, the action during to cooling operation describes.
When carrying out cooling operation, the stream of cross valve 4 is configured to the dotted line direction of Fig. 1.The gas refrigerant (point 1 of Fig. 3) of the HTHP of discharging from compressor 3 through cross valve 4, flow into the outdoor heat converter 12 that becomes condenser, at this condensation liquefaction that simultaneously dispels the heat, become the cold-producing medium (point 2 of Fig. 3) of high pressure low temperature.From cold-producing medium some decompression backs (point 3 of Fig. 3) of process first expansion valve 11 that outdoor heat converter 12 flows out, in second inner heat exchanger 10 with the refrigerant of low temperature that flows into spray circuits 13 carry out being cooled after the heat exchange (point 4 of Fig. 3), at this, after part of refrigerant is diverted to spray circuits 13, and then in first inner heat exchanger 9 with the cold-producing medium that is inhaled into compressor 3 carry out being cooled after the heat exchange (point 5 of Fig. 3).
Then, in the low pressure that reduces pressure by second expansion valve 8, become two phase refrigerant after (point 6 of Fig. 3), flow out, flow into indoor sets 2 from off-premises station 1 through liquid line 7.Flow into the indoor heat converter 6 become evaporimeter then, one side in this heat absorption, carry out boil-off gasization (point 7 of Fig. 3), a load side medium cooling towards the empty G﹠W of indoor set 2 sides etc.
The low-pressure refrigerant gas that flows out from indoor heat converter 6 flows out indoor set 2, flows into off-premises station 1 through flue 5, carry out heat exchange with high-pressure refrigerant, be heated back (point 8 of Fig. 3) at first inner heat exchanger 9 through cross valve 4 backs, be inhaled into compressor 3.
On the other hand, the cold-producing medium that is divided to spray circuits 13 is pressed by the 3rd expansion valve 14 centre of reducing pressure, become the two phase refrigerant (point 9 of Fig. 3) of low temperature, in second inner heat exchanger 10, carry out heat exchange afterwards, be heated (point 10 of Fig. 3), sprayed to compressor 3 with high-pressure refrigerant.In compressor 3 inside, after pressure, the heating (point 11 of Fig. 3), the cold-producing medium interflow with injected reduced back (point 12 of Fig. 3) in temperature, is compressed to high pressure, discharge (point 1 of Fig. 3) once more in the middle of the cold-producing medium that is inhaled into (point 8 of Fig. 3) was compressed to.
PH line chart when carrying out cooling operation roughly the same when carrying out warming operation, which kind of operation mode all can be realized same running.
Below the running control action in this refrigerating air-conditioning is described.
At first the control action during to warming operation describes according to the flow chart of Fig. 4.
When carrying out warming operation, at first the capacity of compressor 3, the aperture of first expansion valve 11, the aperture of second expansion valve 8 and the aperture of the 3rd expansion valve 14 are set to initial value (step S1).
Then, begin through (step S2) after the stipulated time from this moment, according to operating condition afterwards, each actuator of following control.
And the capacity of control compressor 3 makes the air themperature of the temperature sensor 16j measurement that utilizes indoor set 2 reach the temperature that the refrigerating air-conditioning user sets in principle.
That is the air themperature and the setting value (step S3) that, compare indoor set 2.Under the air themperature situation identical or approaching, keep the capacity of compressor 3 constant, enter next procedure with design temperature.
And, change the capacity of compressor 3, make and under the air themperature situation more much lower, increase the capacity of compressor 3 than design temperature, under the situation of air themperature near design temperature, keep the capacity of compressor 3 constant, be higher than under the situation of design temperature in air themperature, reduce the capacity (step S4) of compressor 3.
The following control of carrying out each expansion valve.
At first, control second expansion valve 8, make the cold-producing medium degree of supercooling SC of indoor heat converter 6 outlets reach prior target value set (for example 10 ℃), this cold-producing medium degree of supercooling SC obtains by the saturated temperature difference of the outlet temperature of temperature and the detected indoor heat converter 6 of temperature sensor 16i of utilizing of utilizing the detected high-pressure refrigerant of temperature sensor 16h.
That is the cold-producing medium degree of supercooling SC and the desired value (step S5) that, compare indoor heat converter 6 outlets.Under the cold-producing medium degree of supercooling SC of the indoor heat converter 6 outlets situation identical or approaching, keep the aperture of second expansion valve 8 constant, enter next procedure with desired value.
And, under the situation of cold-producing medium degree of supercooling SC, dwindle the mode of the aperture of second expansion valve 8 to increase the aperture of second expansion valve 8 under greater than the situation of desired value, change the aperture (step 6) of second expansion valve 8 less than desired value at the cold-producing medium degree of supercooling SC of indoor heat converter 6 outlet.
Then, control first expansion valve 11, the refrigerant superheat degree SH that makes compressor 3 suck reaches prior target value set (for example 10 ℃), and this refrigerant superheat degree SH is by utilizing detected compressor 3 inlet temperatures of temperature sensor 16f and utilizing the temperature difference of the saturation temperature of the detected low pressure refrigerant of temperature sensor 16c to obtain.
That is, compare refrigerant superheat degree SH and the desired value (step S7) that compressor 3 sucks.Under the refrigerant superheat degree SH that compressor 3 the sucks situation identical or approaching, keep the aperture of first expansion valve 11 constant, enter next procedure with desired value.
And, increase the aperture of first expansion valve 11 under greater than the situation of desired value and under the situation of refrigerant superheat degree SH, dwindle the mode of the aperture of first expansion valve 11 with the refrigerant superheat degree SH that sucks at compressor 3, change the aperture (step S8) of first expansion valve 11 less than desired value.
Then, control the 3rd expansion valve 14, make the discharge temperature of utilizing the detected compressor 3 of temperature sensor 16a reach prior target value set (for example 90 ℃).
That is the discharge temperature and the desired value (step S9) that, compare compressor 3.Under the discharge temperature of compressor 3 situation identical or approaching, keep the aperture of the 3rd expansion valve 14 constant, turn back to step S2 with desired value.
It below is the variation of the refrigerant condition when changing the aperture of the 3rd expansion valve 14.
If the aperture of the 3rd expansion valve 14 increases, the refrigerant flow that then flows into spray circuits 13 increases.Because big variation does not take place because of the flow of spray circuits 13 in the heat exchange amount in second inner heat exchanger 10, therefore, when the refrigerant flow that flows into spray circuits 13 increases, the cold-producing medium enthalpy difference of spray circuits 13 sides in second inner heat exchanger 10 (point 9 → 10 of Fig. 2 poor) diminishes, and injected cold-producing medium enthalpy (point 10 of Fig. 2) reduces.
Therefore, the enthalpy of the cold-producing medium enthalpy after the cold-producing medium after the injection collaborates (point 12 of Fig. 2) also reduces, its result, and the discharge enthalpy of compressor 3 (point 1 of Fig. 2) also reduces, and the discharge temperature of compressor 3 reduces.
On the contrary, if the aperture of the 3rd expansion valve 14 is dwindled, then the discharge enthalpy of compressor 3 rises, and the discharge temperature of compressor 3 rises.Therefore, aperture control for the 3rd expansion valve 14, otherwise be higher than the mode of dwindling the aperture of the 3rd expansion valve 14 under the aperture that increases the 3rd expansion valve 14 under the situation of desired value is lower than desired value in discharge temperature the situation with discharge temperature at compressor 3, change the aperture (step S10) of the 3rd expansion valve 14, turn back to step S2 afterwards.
Control action during to cooling operation describes according to the flow chart of Fig. 5 below.
When carrying out cooling operation, at first the capacity of compressor 3, the aperture of first expansion valve 11, the aperture of second expansion valve 8 and the aperture of the 3rd expansion valve 14 are set to initial value (step S11).
Begin through (step S12) after the stipulated time from this moment, according to operating condition afterwards, each actuator of following control.
At first, the capacity of control compressor 3 makes the air themperature of the temperature sensor 16j measurement that utilizes indoor set 2 identical with the temperature that the refrigerating air-conditioning user sets in principle.
That is the air themperature and the design temperature (step S13) that, compare indoor set 2.Under the air themperature situation identical or approaching, keep the capacity of compressor 3 constant, enter next procedure with design temperature.
And, change the capacity of compressor 3, make under the situation that air themperature rises significantly than design temperature, increase the capacity of compressor 3, under the air themperature situation lower, reduce the capacity (step S14) of compressor 3 than design temperature.
The following control of carrying out each expansion valve.
At first, control first expansion valve 11, make the cold-producing medium degree of supercooling SC of outdoor heat converter 12 outlet reach prior target value set (for example 10 ℃), this cold-producing medium degree of supercooling SC by utilizing the detected high-pressure refrigerant of temperature sensor 16c saturation temperature and utilize the temperature difference of the outlet temperature of the detected outdoor heat converter 12 of temperature sensor 16d to obtain.
That is the cold-producing medium degree of supercooling SC and the desired value (step S15) that, compare outdoor heat converter 12 outlets.Under the cold-producing medium degree of supercooling SC of the outdoor heat converter 12 outlets situation identical or approaching, keep the aperture of first expansion valve 11 constant, enter next procedure with desired value.
And, under the situation of cold-producing medium degree of supercooling SC, dwindle the mode of the aperture of first expansion valve 11 to increase the aperture of first expansion valve 11 under greater than the situation of desired value, change the aperture (step S16) of first expansion valve 11 less than desired value at the cold-producing medium degree of supercooling SC of outdoor heat converter 12 outlet.
Then, control second expansion valve 8, the refrigerant superheat degree SH that makes compressor 3 suck reaches prior target value set (for example 10 ℃), and this refrigerant superheat degree SH is by utilizing detected compressor 3 inlet temperatures of temperature sensor 16f and utilizing the temperature difference of the saturation temperature of the detected low pressure refrigerant of temperature sensor 16h to obtain.
That is, compare refrigerant superheat degree SH and the desired value (step S17) that compressor 3 sucks.Under the refrigerant superheat degree SH that compressor 3 the sucks situation identical or approaching, keep the aperture of second expansion valve 8 constant, enter next procedure with desired value.
And, increase the aperture of second expansion valve 8 under greater than the situation of desired value and under the situation of refrigerant superheat degree SH, dwindle the mode of the aperture of second expansion valve 8 with the refrigerant superheat degree SH that sucks at compressor 3, change the aperture (step S18) of second expansion valve 8 less than desired value.
Then, control the 3rd expansion valve 14, make the discharge temperature of utilizing the detected compressor 3 of temperature sensor 16a reach prior target value set (for example 90 ℃).
That is the discharge temperature and the desired value (step S19) that, compare compressor 3.Under the discharge temperature of compressor 3 situation identical or approaching, keep the aperture of the 3rd expansion valve 14 constant, turn back to step S12 with desired value.
And, because the refrigerant condition the when aperture of the 3rd expansion valve 14 is changed is identical when changing with warming operation, therefore, otherwise be higher than the mode of dwindling the aperture of the 3rd expansion valve 14 under the aperture that increases the 3rd expansion valve 14 under the situation of desired value is lower than desired value in discharge temperature the situation with discharge temperature at compressor 3, change the aperture (step S20) of the 3rd expansion valve 14, turn back to step S12.
Below, the loop formation of present embodiment and the action effect of realizing by control are described.In the formation of this device,, especially warming operation is described below therefore because cooling operation still is that warming operation all carries out identical running.
It is so-called gas spray circuits that the loop of this device constitutes.That is be to spray to the structure of compressor 3 at the gas refrigerant the cold-producing medium that after the indoor heat converter 6 that becomes condenser flows out, is depressurized to middle pressure.
In general, adopt the cold-producing medium of in gas-liquid separator, the centre being pressed to be separated into the structure that liquids and gases then spray more, but the structure that as shown in Figure 6, this device adopts is the thermal release liquids and gases by the heat exchange in second inner heat exchanger 10, spray.
By forming the gas spray circuits, can obtaining following effect.
At first, spray by carrying out gas, the refrigerant flow of discharging from compressor 3 increases, the injected refrigerant flow Ginj of refrigerant flow Gsuc+ that the refrigerant flow Gdis=that discharges from compressor 3 is sucked by compressor 3.
Therefore, increase owing to flow into the refrigerant flow of the heat exchanger become condenser, therefore under the situation of warming operation, heating capacity increases.
On the other hand, by the heat exchange in second inner heat exchanger 10, as shown in Figure 6, the cold-producing medium enthalpy that flows into the heat exchanger that becomes evaporimeter reduces, and the cold-producing medium enthalpy difference in evaporimeter increases.Therefore, when carrying out cooling operation, refrigerating capacity also increases to some extent.
And, under the situation of carrying out the gas injection, the effect of the efficient that also can be improved.
The cold-producing medium of inflow evaporator generally is the gas-liquid two-phase cold-producing medium, but wherein gas refrigerant is inoperative to refrigerating capacity.From compressor 3, this compressor 3 carry out with the gas refrigerant of this low pressure with in evaporimeter with evaporation after gas refrigerant boost to the work of high pressure.
Spray if carry out gas, then extract a part in the gas refrigerant of inflow evaporator, spray, press from the centre and be raised to high pressure, compress with middle pressure.
Therefore, the compression work that does not need flow to the gas refrigerant that sprays to press in the middle of carrying out rising to from low pressure can improve this part efficient.This effect can obtain in arbitrary running of refrigeration and heating.
Below the correlation of gas injection flow and heating capacity is described.
If increase the gas injection flow, then as mentioned above, the refrigerant flow of discharging from compressor 3 increases, and the discharge temperature of compressor 3 reduces, the refrigerant temperature of inflow condenser also reduces.
The heat exchange performance of condenser again, in general the Temperature Distribution in the heat exchanger is high more, then heat exchange amount is high more.Under identical condensation temperature, the asynchronous refrigerant temperature of the refrigerant temperature of condenser inlet changes as shown in Figure 7, in condenser, the cold-producing medium Temperature Distribution that becomes the part of overheated gas state changes to some extent.
In condenser, the heat exchange amount when cold-producing medium is condensation temperature, two-phase state occupies the majority, but the heat exchange amount of the part of overheated gas state also accounts for about 20%～30% of integral body, and is very big to the influence of heat exchange amount.
If injection flow is too much, the refrigerant temperature of overheated gas part obviously reduces, then the heat exchange performance of condenser descends, and heating capacity also reduces.Fig. 8 represents the above-mentioned gas injection flow and the correlation of heating capacity, the gas injection flow when existing heating capacity to be maximum.
Below, the action effect of first inner heat exchanger 9 of present embodiment is described.
In first inner heat exchanger 9, carry out heat exchange from the high pressure liquid refrigerant of condenser outflow and the suction cold-producing medium of compressor 3.Because of high pressure liquid refrigerant is cooled in first inner heat exchanger 9, the enthalpy of the cold-producing medium of inflow evaporator reduces, and therefore, the cold-producing medium enthalpy difference in the evaporimeter increases.
Refrigerating capacity when therefore, carrying out cooling operation increases.
On the other hand, the cold-producing medium that sucks compressor 3 is heated, and inlet temperature rises.The discharge temperature of compressor 3 also rises thereupon.And, in the compression travel of compressor 3,, in general, also need more work than the compression high temperature refrigerant even carrying out under the same situation of boosting.
Therefore, the influence that 9 pairs of efficient faces of first inner heat exchanger are set shows that the evaporimeter enthalpy difference increases that the ability of bringing increases and this two aspect of increase of compression work, under the big situation of the influence of the ability increase that the increase of evaporimeter enthalpy difference brings, the running efficiency of device rises.
Below, the effect under the situation that gas shown in present embodiment, the combination heat exchange of first inner heat exchanger 9 and spray circuits 13 is sprayed describes.
If carry out the heat exchange of first inner heat exchanger 9, then the inlet temperature of compressor 3 rises.Therefore, in the variation of compressor 3 inside when spraying, rise to middle cold-producing medium enthalpy (point 11 of Fig. 2, Fig. 3) of pressing from low pressure and improve, the cold-producing medium enthalpy (point 12 of Fig. 2, Fig. 3) after collaborating with the cold-producing medium that sprays also improves.
Therefore, the discharge enthalpy of compressor 3 (point 1 of Fig. 2, Fig. 3) also improves, and the discharge temperature of compressor 3 rises.Therefore, according to the heat exchange whether first inner heat exchanger 9 is arranged, the correlation of gas injection flow and heating capacity changes as shown in Figure 9.
Under the situation of the heat exchange with first inner heat exchanger 9, because the discharge temperature of the compressor 3 when carrying out identical emitted dose improves, therefore, the refrigerant temperature of condenser inlet also improves, and the condenser heat exchange amount increases, and heating capacity increases.Therefore, the injection flow that forms the heating capacity peak value increases, and the peak value of heating capacity also increases itself, can obtain more heating capacity.
In addition,, the suction degree of superheat of compressor 3 is risen, the discharge temperature of compressor 3 is risen by the aperture of controlling first expansion valve 11 even under the situation that does not have first inner heat exchanger 9.
But in this case, the refrigerant superheat degree that exports owing to the outdoor heat converter 12 as evaporimeter also increases simultaneously, so the heat exchanger effectiveness of outdoor heat converter 12 reduces.
In case the heat exchanger effectiveness of outdoor heat converter 12 reduces, then, form the running that low pressure reduces in order to obtain identical heat exchange amount, must to reduce evaporating temperature.
In case low pressure reduces, then the refrigerant flow of compressor 3 suctions also reduces, and therefore, if carry out such running, can reduce heating capacity on the contrary.
On the contrary, if use first inner heat exchanger 9, then the refrigerant condition as outdoor heat converter 12 outlet of evaporimeter becomes suitable state, the discharge temperature of compressor 3 is risen, avoid above-mentioned low pressure to reduce, realize easily the increase of heating capacity.
And, the loop structure of present embodiment adopt with after carry out overheated gasization behind a part of high-pressure refrigerant shunting decompression, in second inner heat exchanger 10, the structure of spraying.
Therefore, spray the situation of the gas that utilizes gas-liquid separator separates with conventional example like that and compare,, therefore, can realize more stable running because emitted dose when changing according to control and operating condition etc., refrigerant amount distribution do not change.
In addition, said more than the 3rd expansion valve 14 controlled so that the discharge temperature of compressor 3 equates with desired value that should controlling desired value, to be arranged to make heating capacity be maximum.
As shown in Figure 9,, have heating capacity, therefore, obtain this discharge temperature in advance, be set at desired value for maximum discharge temperature owing to correlation from gas injection flow-heating capacity-discharge temperature.In addition, it is certain value that the desired value of discharge temperature need not, and also can change at any time according to the machine characteristic of operating condition and condenser etc.
Like this, it is maximum by the control discharge temperature, can controlling the gas emitted dose, make heating capacity.
Not only can so that heating capacity for maximum mode the gas emitted dose is controlled, also can so that running efficiency for maximum mode the gas emitted dose is controlled.
Under the situation of a large amount of heating capacity of the needs as starting refrigerating air-conditioning, ability is controlled at maximum, but under the situation that turned round behind the certain hour at device, room temperature has risen because of heating, just do not need so many heating capacities, therefore, be controlled to the efficient maximum in this case.
Have correlation as shown in figure 10 between injection flow, heating capacity and running efficiency, compare for maximum situation with heating capacity, when running efficiency was maximum, injection flow reduced, discharge temperature improves.
In heating capacity is in the injection flow of maximum, because discharge temperature is reduced, therefore the heat exchange performance of condenser reduces, and, in order to increase injection flow, intermediate pressure reduces, the compression work of compression injection part increases, like this, with running efficiency for maximum situation is compared, efficient reduces.
Therefore, the discharge temperature desired value of controlling as the 3rd expansion valve 14 that utilizes spray circuits 13, not only has the desired value that becomes maximum heating capacity, and has a desired value that becomes maximum operating efficiency, according to operational situation (for example situation of the running capacity of compressor 3 and indoor pusher side air themperature etc.), when the needs heating capacity, be set at heating capacity and be maximum desired value, set running efficiency in addition for and be maximum desired value.
By carrying out such running, when realizing a large amount of heating capacities, can carry out the high efficiency running of device.
And, control first expansion valve 11 so that the suction degree of superheat of compressor 3 reaches desired value, by this control, can form the suitableeest degree of superheat as the heat exchanger outlet of evaporimeter, thereby can guarantee in the evaporimeter high heat exchange performance, and can guarantee the appropriateness cold-producing medium enthalpy difference ground turn round, can carry out high efficiency running.
Though it is different because of the characteristic of heat exchanger to form the degree of superheat of the evaporator outlet that turns round like this, but greatly about about 2 ℃, because cold-producing medium is heated in first inner heat exchanger 9 afterwards, therefore, the desired value of the suction degree of superheat of compressor 3 is higher than this value, for example is set at desired value with above-mentioned 10 ℃.
Therefore, for first expansion valve 11, the degree of superheat of outdoor heat converter 12 outlets of being obtained by the temperature difference of temperature sensor 16b and temperature sensor 16c during with the degree of superheat of evaporator outlet, warming operation is controlled to and reaches desired value (for example above-mentioned 2 ℃).
But, under the situation of the degree of superheat of directly controlling evaporator outlet, be under the situation of the low value about 2 ℃ in its desired value, evaporator outlet becomes the gas-liquid two-phase state transiently, and generation can not correctly detect the degree of superheat, be difficult to the problem of control.
If the suction degree of superheat with compressor 3 detects, then can set high desired value, and, can not suck the situation that cold-producing medium becomes gas-liquid two-phase, can not correctly detect the degree of superheat owing to the heating in first inner heat exchanger 9, can more easily control, can carry out more stable control.
And, control second expansion valve 8 so that reach desired value as the degree of supercooling of indoor heat converter 6 outlet of condenser, by this control, can guarantee in the condenser high heat exchange performance, and can guarantee suitably that cold-producing medium enthalpy difference ground turns round, and can carry out high efficiency running.
Though it is different because of the characteristic of heat exchanger to form the degree of supercooling of the condensator outlet that turns round like this, greatly about about 5～10 ℃.
In addition, be higher than this value, for example about 10～15 ℃, also can increase the running of heating capacity by the desired value of degree of supercooling is set for.
Therefore, also can change the desired value of degree of supercooling, guarantee heating capacity with high any degree of supercooling desired value during starting drive, carry out the high efficiency running with low any degree of supercooling desired value during ambient-temp-stable according to operational situation.
In addition, the cold-producing medium as refrigerating air-conditioning is not limited to R410A, also can use the CO of the R134a of HFC class cold-producing medium or R404A, R407C, natural cold-producing medium
2, other cold-producing medium such as HC class cold-producing medium, ammonia, air, water.Especially at CO
2The shortcoming that cold-producing medium enthalpy difference when using as cold-producing medium in the evaporimeter is little, running efficiency reduces, the structure of this device can enlarge the evaporimeter enthalpy difference by first inner heat exchanger 9, second inner heat exchanger 10, therefore, can raise the efficiency biglyyer, be fit to use this device.
And, using CO
2Situation under, do not have condensation temperature, in high-pressure side heat exchanger, temperature reduces along with flowing as radiator.Therefore, heat exchange amount in the radiator changes and becomes condensation temperature in interval necessarily, can guarantee that the HFC class cold-producing medium etc. of a certain amount of heat exchange amount is different, is subjected to the influence of inlet temperature big.
Therefore, as present embodiment, can simultaneously improve the structure that discharge temperature simultaneously increases injection flow by adopting, the increment rate that makes heating capacity is greater than HFC class cold-producing medium etc., and CO2 also is fit to use this device in this respect.
And, first inner heat exchanger 9, second inner heat exchanger 10 the structure that the position is not limited to Fig. 1 is set, the position relation in downstream, upstream also can obtain same effect on the contrary.And the position that spray circuits 13 is set also is not limited to the position of Fig. 1, is arranged at other the middle splenium branch and the position of high pressure liquid portion and also can obtains same effect.
In addition, consider the control stability of the 3rd expansion valve 14, spray circuits 13 the position that the position preferably is completed into liquid rather than gas-liquid two-phase state is set.
In addition, in the present embodiment, owing to the position that is provided with of first inner heat exchanger 9, second inner heat exchanger 10 and spray circuits 13 is set between first expansion valve 11 and the 3rd expansion valve 8, therefore, under any pattern of changes in temperature, can carries out same injection running.
And,, the pressure sensor, the detected force value that converts that detect high-low pressure also can be set, obtain saturation temperature though utilize refrigerant temperature sensors in the middle of the condenser, evaporimeter to detect the saturation temperature of cold-producing medium.
Second embodiment
Below second embodiment of the present invention as shown in figure 11.Figure 11 is the refrigerant loop figure of the refrigerating air-conditioning of second embodiment, and middle pressure memory 17 is arranged in the off-premises station, and the suction pipe arrangement of compressor 3 connects its inside.
The structure that the cold-producing medium that forms this perforation part and middle pressure memory 17 interior cold-producing mediums can carry out heat exchange, have with first embodiment in first inner heat exchanger, 9 identical functions.
The action effect of present embodiment is all identical with first embodiment except middle pressure memory 17, therefore, omits the explanation to this part.When carrying out warming operation, during flowing into, the gas-liquid two-phase cold-producing medium of in-room switch 6 outlets presses memory 17, and cooling in middle pressure memory 17, formation liquid flow out.When carrying out cooling operation, from the gas-liquid two-phase cold-producing medium inflow that first expansion valve 11 flows out, press memory 17, cooling in middle pressure memory 17, formation liquid flow out.
Heat exchange in middle pressure memory 17 mainly be in the gas-liquid two-phase cold-producing medium gas refrigerant with suck that pipe arrangement contacts, condensation liquefaction, carry out heat exchange.Therefore, press the liquid refrigerating dosage in the memory 17 few more in being trapped in, gas refrigerant is big more with the contact area that sucks pipe arrangement, and heat exchange amount increases.On the contrary, if press the liquid refrigerating dosage in the memory 17 many in being trapped in, then gas refrigerant reduces with the contact area that sucks pipe arrangement, and heat exchange amount reduces.
Like this, owing to pressing memory 17 to obtain following effect in having.
At first, since middle pressure memory 17 go out interruption-forming liquid, therefore, the cold-producing medium that flows into the 3rd expansion valve 14 when carrying out warming operation must form liquid refrigerant, therefore the discharge characteristic of the 3rd expansion valve 14 is stable, can guarantee control stability, carry out stable device running.
And by carry out heat exchange in middle pressure memory 17, the pressure of pressure memory 17 becomes in also having, and inlet pressure stable, the 3rd expansion valve 14 is stable, the stable effect of refrigerant flow of inflow spray circuits 13.For example if there is load variations etc. to make high pressure change, press the pressure in the memory 17 to change in then thereupon, change but can suppress pressure by the heat exchanges in the middle pressure memory 17.
In case load increases, high pressure rises, press the pressure in the memory 17 also to rise in then, but this moment owing to enlarge with the pressure differential of low pressure, the temperature difference in the heat exchanger in the middle pressure memory 17 also enlarges, so heat exchange amount increases.If heat exchange amount increases, the amount that the gas refrigerant in the gas-liquid two-phase cold-producing medium in then flowing in the pressure memory 17 carries out condensation increases, and therefore, pressure is not easy to rise, and presses the pressure rising of memory 17 in can suppressing.
On the contrary, in case load reduces, high pressure reduces, press the pressure in the memory 17 also to reduce in then, but the pressure differential of this moment and low pressure diminishes, the temperature difference in the heat exchanger in the middle pressure memory 17 is also dwindled, so the heat exchange tolerance reduces.In case the heat exchange tolerance reduces, the amount that the gas refrigerant in the gas-liquid two-phase cold-producing medium in then flowing in the pressure memory 17 carries out condensation reduces, and therefore, pressure is not easy to descend, and presses the pressure decline of memory 17 in can suppressing.
Like this, by carry out heat exchange in middle pressure memory 17, automatically produce the variation of the heat exchange amount that changes along with operating condition, its result presses the pressure in the memory 17 to change in can suppressing.
And,, also have the effect of stabilising arrangement running itself by in middle pressure memory 17, carrying out heat exchange.For example, under the situation that state in low-pressure side changes, increase as the refrigerant superheat degree of the outlet of the outdoor heat converter 12 of evaporimeter, because the temperature difference the during heat exchange in the middle pressure memory 17 reduces, therefore heat exchange amount reduces, gas refrigerant is not easy condensation, and the therefore middle memory 17 interior increase of gas refrigeration dosage, the liquid refrigerating dosage of pressing reduce.
The liquid refrigerating dosage that reduces moves to outdoor heat converter 12, and the liquid refrigerating dosage in the outdoor heat converter 12 increases, and therefore, can suppress the increase of the refrigerant superheat degree of outdoor heat converter 12 outlets, and the running of restraining device changes.
On the contrary, under the situation that state in low-pressure side changes, diminish as the refrigerant superheat degree of outdoor heat converter 12 outlets of evaporimeter, because the temperature difference the during heat exchange in the middle pressure memory 17 increases, therefore heat exchange amount increases, the easy condensation of gas refrigerant, the therefore middle memory 17 interior minimizing of gas refrigeration dosage, the liquid refrigerating dosage of pressing increase.The liquid refrigerating dosage of this part moves from outdoor heat converter 12, thereby the liquid refrigerating dosage in the outdoor heat converter 12 reduces, and therefore, the refrigerant superheat degree that can suppress outdoor heat converter 12 outlets diminishes, and the running of restraining device changes.
This suppresses the effect that degree of superheat changes, and also produces by the variation of carrying out heat exchange in middle pressure memory 17, automatically producing the heat exchange amount that changes along with operating condition.
As mentioned above, by in middle pressure memory 17, carrying out the heat exchange of in first inner heat exchanger 9, carrying out in first embodiment, even the running of generating means changes, also can change and suppress to change by automatic heat exchange amount, stably carry out the device running.
In addition, though be the structure of carrying out heat exchange at middle pressure memory 17, so long as the structure of carrying out heat exchange with cold-producing medium in the middle pressure memory 17, then whatsoever the structure of sample can obtain same effect.For example, the structure that also can adopt the suction pipe arrangement that makes compressor 3 and middle pressure memory 17 container peripheries to contact, carry out heat exchange.
And, also can therefrom press memory 17 bottoms to supply with the cold-producing medium of supplying with to spray circuits 13.In this case, in each running of refrigeration and heating, liquid refrigerant flows into the 3rd expansion valve 14, therefore, no matter be in cooling operation, or in warming operation, the discharge characteristic of the 3rd expansion valve 14 all is stable, can guarantee control stability.
Claims (14)
1. heat pump assembly, has refrigerant loop, in this refrigerant loop, with make cold-producing medium heat absorption heat exchanger (12), from above-mentioned heat exchanger (12) suck cold-producing medium compressor (3), make the heat exchanger (6) of the refrigerant loses heat of discharging from above-mentioned compressor (3) and reduce the expansion valve (11) that flows to the pressure of the cold-producing medium the above-mentioned heat exchanger (12) from above-mentioned heat exchanger (6) and connected, so that cold-producing medium circulation, the heat that utilization discharges from above-mentioned heat exchanger (6), it is characterized in that this heat pump assembly has:
Bypass path (13) makes from the part of above-mentioned heat exchanger (6) towards the mobile cold-producing medium of above-mentioned heat exchanger (12), is inhaled into above-mentioned compressor (3) with the above-mentioned heat exchanger of process (12) and is compressed into middle cold-producing medium interflow of pressing;
Expansion valve (14) is arranged in the above-mentioned bypass path (13), is used for reducing the pressure of the cold-producing medium that flows through above-mentioned bypass path (13);
Heat exchanger (10) is arranged in above-mentioned refrigerant loop and the above-mentioned bypass path (13), will give the cold-producing medium that flows through above-mentioned bypass path (13) towards the heat of the mobile cold-producing medium of above-mentioned heat exchanger (12) from above-mentioned heat exchanger (6);
Be used for the temperature sensor (16a) of detection from the temperature of the cold-producing medium of above-mentioned compressor (3) discharge; And
Control device (15) is controlled the aperture of above-mentioned expansion valve (14), makes the temperature of the cold-producing medium that is detected by said temperature sensor (16a) consistent with the desired value of predefined discharge temperature.
2. heat pump assembly as claimed in claim 1 is characterized in that, the cold-producing medium that flows through above-mentioned bypass path (13) becomes the gas-liquid two-phase state under the effect of above-mentioned expansion valve (14).
3. heat pump assembly as claimed in claim 1 or 2, it is characterized in that, above-mentioned control device (15) is higher than in the discharge temperature of the cold-producing medium that is detected by said temperature sensor (16a) under the situation of desired value of predefined discharge temperature, control increases the aperture of above-mentioned expansion valve (14), the feasible enthalpy that flows through the cold-producing medium of above-mentioned bypass path (13) reduces, be lower than in the discharge temperature of the cold-producing medium that detects by said temperature sensor (16a) under the situation of desired value of predefined discharge temperature, control reduces the aperture of above-mentioned expansion valve (14), and the feasible enthalpy that flows through the cold-producing medium of above-mentioned bypass path (13) rises.
4. as each described heat pump assembly in the claim 1 to 3, it is characterized in that the temperature sensor (16c) and being used to temperature of the cold-producing medium that is used to detect above-mentioned heat exchanger (12) detects the temperature sensor (16b) of temperature of the cold-producing medium of above-mentioned heat exchanger (12) outlet side;
The temperature that temperature that above-mentioned control device (15) detects according to said temperature sensor (16c) and said temperature sensor (16b) detect is obtained the refrigerant superheat degree of above-mentioned heat exchanger (12) outlet side, and so that the mode that this refrigerant superheat degree becomes the desired value of predefined refrigerant superheat degree is controlled above-mentioned expansion valve (11).
5. as each described heat pump assembly in the claim 1 to 3, it is characterized in that the temperature sensor (16c) and being used for temperature of the cold-producing medium that is used to detect above-mentioned heat exchanger (12) detects the temperature sensor (16f) of the temperature of the cold-producing medium that flow into above-mentioned compressor (3);
The temperature that temperature that above-mentioned control device (15) detects according to said temperature sensor (16c) and said temperature sensor (16f) detect is obtained the refrigerant superheat degree of above-mentioned compressor (3) suction portion, and so that the mode that this refrigerant superheat degree becomes the desired value of predefined refrigerant superheat degree is controlled above-mentioned expansion valve (11).
6. as each described heat pump assembly in the claim 1 to 5, it is characterized in that the desired value of discharge temperature is the temperature at the cold-producing medium of the discharge side of the above-mentioned compressor (3) under the situation of the changes in flow rate that makes the cold-producing medium that flows to above-mentioned compressor (3) from above-mentioned bypass path (13), when the expression heating capacity is maximum.
7. heat pump assembly as claimed in claim 6, it is characterized in that above-mentioned control device (15) becomes the desired value of discharge temperature into the temperature that the running efficiency that is lower than said temperature improves from the temperature of the cold-producing medium of the discharge side of the above-mentioned compressor (3) of expression heating capacity when maximum.
8. the off-premises station of a heat pump assembly, has refrigerant loop, in this refrigerant loop, the heat exchanger (12) of cold-producing medium heat absorption will be made, suction is discharged to the compressor (3) the heat exchanger (6) that makes refrigerant loses heat from the cold-producing medium of above-mentioned heat exchanger (12) outflow and with cold-producing medium, and reduction is connected from the expansion valve (11) that above-mentioned heat exchanger (6) flows to the pressure of the cold-producing medium the above-mentioned heat exchanger (12), so that cold-producing medium circulation, the heat that utilization discharges from above-mentioned heat exchanger (6), it is characterized in that the off-premises station of this heat pump assembly has:
Bypass path (13) makes from the part of above-mentioned heat exchanger (6) towards the mobile cold-producing medium of above-mentioned heat exchanger (12), is inhaled into above-mentioned compressor (3) with the above-mentioned heat exchanger of process (12) and is compressed into middle cold-producing medium interflow of pressing;
Expansion valve (14) is arranged in the above-mentioned bypass path (13), is used for reducing the pressure of the cold-producing medium that flows through above-mentioned bypass path (13);
Heat exchanger (10) is arranged in above-mentioned refrigerant loop and the above-mentioned bypass path (13), will give the cold-producing medium that flows through above-mentioned bypass path (13) towards the heat of the mobile cold-producing medium of above-mentioned heat exchanger (12) from above-mentioned heat exchanger (6);
Be used for the temperature sensor (16a) of detection from the temperature of the cold-producing medium of above-mentioned compressor (3) discharge; And
Control device (15) is controlled the aperture of above-mentioned expansion valve (14), makes the temperature of the cold-producing medium that is detected by said temperature sensor (16a) consistent with the desired value of predefined discharge temperature.
9. the off-premises station of heat pump assembly as claimed in claim 8 is characterized in that, the cold-producing medium that flows through above-mentioned bypass path (13) becomes the gas-liquid two-phase state under the effect of above-mentioned expansion valve (14).
10. the off-premises station of heat pump assembly as claimed in claim 8 or 9, it is characterized in that, above-mentioned control device (15) is higher than in the discharge temperature of the cold-producing medium that is detected by said temperature sensor (16a) under the situation of desired value of predefined discharge temperature, control increases the aperture of above-mentioned expansion valve (14), the feasible enthalpy that flows through the cold-producing medium of above-mentioned bypass path (13) reduces, be lower than in the discharge temperature of the cold-producing medium that detects by said temperature sensor (16a) under the situation of desired value of predefined discharge temperature, control reduces the aperture of above-mentioned expansion valve (14), and the feasible enthalpy that flows through the cold-producing medium of above-mentioned bypass path (13) rises.
11. off-premises station as each described heat pump assembly in the claim 8 to 10, it is characterized in that the temperature sensor (16c) and being used to temperature of the cold-producing medium that is used to detect above-mentioned heat exchanger (12) detects the temperature sensor (16b) of temperature of the cold-producing medium of above-mentioned heat exchanger (12) outlet side;
The temperature that temperature that above-mentioned control device (15) detects according to said temperature sensor (16c) and said temperature sensor (16b) detect is obtained the refrigerant superheat degree of above-mentioned heat exchanger (12) outlet side, and so that the mode that this refrigerant superheat degree becomes the desired value of predefined refrigerant superheat degree is controlled above-mentioned expansion valve (11).
12. off-premises station as each described heat pump assembly in the claim 8 to 10, it is characterized in that the temperature sensor (16c) and being used for temperature of the cold-producing medium that is used to detect above-mentioned heat exchanger (12) detects the temperature sensor (16f) of the temperature of the cold-producing medium that flow into above-mentioned compressor (3);
The temperature that temperature that above-mentioned control device (15) detects according to said temperature sensor (16c) and said temperature sensor (16f) detect is obtained the refrigerant superheat degree of above-mentioned compressor (3) suction portion, and so that the mode that this refrigerant superheat degree becomes the desired value of predefined refrigerant superheat degree is controlled above-mentioned expansion valve (11).
13. off-premises station as each described heat pump assembly in the claim 9 to 12, it is characterized in that the desired value of discharge temperature is the temperature at the cold-producing medium of the discharge side of the above-mentioned compressor (3) under the situation of the changes in flow rate that makes the cold-producing medium that flows to above-mentioned compressor (3) from above-mentioned bypass path (13), when the expression heating capacity is maximum.
14. the off-premises station of heat pump assembly as claimed in claim 13, it is characterized in that above-mentioned control device (15) becomes the desired value of discharge temperature into the temperature that the running efficiency that is lower than said temperature improves from the temperature of the cold-producing medium of the discharge side of the above-mentioned compressor (3) of expression heating capacity when maximum.
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| CN2009101691839A CN101666561B (en) | 2006-03-27 | 2006-03-27 | Refrigerating and air-conditioning plant |
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| CN2009101691839A CN101666561B (en) | 2006-03-27 | 2006-03-27 | Refrigerating and air-conditioning plant |
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