CN105241125A - Compressor, refrigeration system and method for lowering temperature and adding gas for compressor - Google Patents
Compressor, refrigeration system and method for lowering temperature and adding gas for compressor Download PDFInfo
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- CN105241125A CN105241125A CN201510757409.2A CN201510757409A CN105241125A CN 105241125 A CN105241125 A CN 105241125A CN 201510757409 A CN201510757409 A CN 201510757409A CN 105241125 A CN105241125 A CN 105241125A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000006835 compression Effects 0.000 claims abstract description 116
- 238000007906 compression Methods 0.000 claims abstract description 116
- 239000003507 refrigerant Substances 0.000 claims description 36
- 238000001816 cooling Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- 230000008520 organization Effects 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract 7
- 239000013589 supplement Substances 0.000 abstract 4
- 229920006395 saturated elastomer Polymers 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000011555 saturated liquid Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The invention relates to a compressor, a refrigeration system and a method for lowering temperature and adding gas for the compressor. The compressor comprises a refrigerating fluid suction port communicated with the outlet of an evaporator, and a compression device arranged on the discharge port of refrigerating fluid and communicated with the inlet of a condenser. The compression device comprises two or more compression units with the pressure levels gradually increased in the flowing direction of the refrigerating fluid. The compression cavity of each compression unit is provided with a gas supplement inlet, and the gas supplement inlets can receive the refrigerating fluid from the part between the evaporator and the condenser. By forming the gas supplement inlets in the compression cavities of two or more compression units with the pressure levels sequentially and gradually increased, the refrigerating fluid can optionally enter the compression cavities of the compression units through the corresponding gas supplement inlets, and therefore the flow of the refrigerating fluid entering the compression units is increased, the gas exhaust amount of the compressor is increased further, the flow of the refrigerating fluid flowing through the condenser is increased, the exhaust temperature of the compressor is lowered, and the compressor can be operated safely.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly relate to a kind of method that compressor, refrigeration system and cooling compressor increase gas.
Background technology
In common heat pump or air-conditioning system, along with the reduction of environment temperature, evaporating temperature reduces, when condensation temperature or condensing pressure constant, compressor air-discharging and air-breathing compression ratio increase, beyond the critical value that ordinary compression system is normally run, compressor efficiency and reliability will reduce rapidly.When working at low ambient temperatures in addition, system evaporating temperature reduces, and compressor air suction specific volume increases, and gas transmission coefficient reduces, and causes heating capacity to reduce, and system coefficient of performance in heating declines.
Prior art normally increases gas tonifying Qi loop within the compressor, the intermediate-pressure gas be between pressure of inspiration(Pi) and pressure at expulsion is filled in the working chamber of compressor compresses unit, improve power system capacity and efficiency with this in system.Change with operating mode Suck and exhaust pressure, optimum superfeed pressure also can change thereupon, existing single tonifying Qi loop not only air compensation is restricted, and the problem that the tonifying Qi effect brought when cannot overcome actual operating mode off-design operating mode declines, and therefore needs further improvement.
Summary of the invention
For overcoming above technological deficiency, the technical problem that the present invention solves is to provide a kind of method that compressor, refrigeration system and cooling compressor increase gas, can increase the capacity of compressor and reduce delivery temperature.
For solving the problems of the technologies described above, the invention provides a kind of compressor, comprise have respectively with the refrigerant suction port of the outlet of evaporimeter and the compressor reducer of cold-producing medium outlet that is communicated with the entrance of condenser, compressor reducer comprises at least two compression units arranged of arbitrarily downgrading along flow of refrigerant direction from low to high, the compression chamber of each compression unit is respectively equipped with tonifying Qi entrance, each tonifying Qi entrance can receive the cold-producing medium between flash-pot and condenser, cold-producing medium optionally can enter the compression chamber of each compression unit, to increase through condensing agent outlet and to flow to the refrigerant flow of condenser.
Further, at least two compression units comprise the rotor-type compressor of low-pressure stage and the scroll compressor of hiigh pressure stage.
Present invention also offers a kind of refrigeration system, it comprises condenser, evaporimeter and above-mentioned compressor, pipeline between condenser and evaporimeter is provided with the shunt be communicated with each tonifying Qi entrance, for the cold-producing medium in pipeline is introduced each tonifying Qi entrance, each shunt being provided with corresponding on-off valve, entering the compression chamber of each compression unit for controlling cold-producing medium respectively.
Further, refrigeration system also comprises flow controller and flash vessel, the inlet of flash vessel is communicated with the outlet of condenser by flow controller, the liquid outlet of flash vessel communicates with the entrance of evaporimeter, the steam (vapor) outlet of flash vessel communicates with shunt, makes the steam generated by flash vessel can enter the compression chamber of each compression unit respectively.
Further, flash vessel comprises along the series connection of flow of refrigerant direction and distinguishes the corresponding sub-flash vessel arranged with each compression unit, and each steam (vapor) outlet of the sub-flash vessel arranged from downstream along flow of refrigerant direction from upstream communicates with each tonifying Qi entrance of at least two compression units arranged from high to low of arbitrarily downgrading with being corresponding in turn to.
Further, refrigeration system also comprises controlling organization and testing agency, testing agency can detect the pressure at expulsion of each compression unit and feed back to controlling organization, and controlling organization controls the break-make of on-off valve cold-producing medium optionally to be sent into the compression chamber of each compression unit.
Present invention also offers and a kind ofly above-mentioned compressor cooling can increase the method for gas, comprising:
Detect the first row atmospheric pressure P of the low-pressure stage compression unit at least two compression units
1, and the second row atmospheric pressure P of hiigh pressure stage compression unit
2;
When default pressure at expulsion Pm is greater than second row atmospheric pressure P2, by corresponding tonifying Qi entrance, cold-producing medium is entered the compression chamber of hiigh pressure stage compression unit;
When default pressure at expulsion Pm is at first row atmospheric pressure P
1and time between second row atmospheric pressure P2, by corresponding tonifying Qi entrance, cold-producing medium is entered the compression chamber of low-pressure stage compression unit;
When default pressure at expulsion Pm is less than first row atmospheric pressure P
1time, stop, by tonifying Qi entrance, cold-producing medium is entered compressor;
There is following relation in the pressure of inspiration(Pi) Ps and the pressure at expulsion Pd that wherein preset pressure at expulsion Pm and compressor:
Pm=k* (Ps*Pd)
0.5, (k=0.8 ~ 1.2), k is pressure at expulsion index.
Thus, based on technique scheme, the invention provides a kind of method that compressor, refrigeration system and cooling compressor increase gas, by arranging tonifying Qi entrance respectively from low to high on the compression chamber of at least two compression units arranged successively of arbitrarily downgrading, cold-producing medium can enter the compression chamber of each compression unit by corresponding tonifying Qi inlet selective, thus increase the refrigerant flow entering each compression unit, thus increase the capacity of compressor, improve the refrigerant flow through condenser; Because the cold-producing medium between evaporimeter and condenser is without the heat exchange of evaporimeter, its temperature is low compared with the temperature of the cold-producing medium entering compressor through evaporator, thus can reduce the delivery temperature of compressor, ensures compressor safe operation.The method that cooling compressor provided by the invention increases gas can carry out between flash-pot and condenser cold-producing medium by Appropriate application, makes compressor have higher efficiency.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention only for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is compressor longitudinal profile structural representation figure of the present invention;
Fig. 2 is the parts connection diagram of inventive refrigeration system first embodiment;
Fig. 3 is the parts connection diagram of inventive refrigeration system second embodiment;
Fig. 4 is the thermodynamic cyclic process schematic diagram of inventive refrigeration system second embodiment
Description of reference numerals:
1-compressor; 2-rotor-type compressor; 3-scroll compressor; 4-condenser; 5-first throttle valve; 6-first flash vessel; 7-second throttle; 8-second flash vessel; 9-choke valve; 10-evaporimeter; 11-first on-off valve; 12-second on-off valve; 13-refrigerant suction port; 14-first tonifying Qi entrance; 15-second tonifying Qi entrance; 16-rotor-type compressor exhaust outlet; 17-lower flange; 18-cylinder; 19-piston; 20-upper flange; 21-bent axle; 21A-bent axle first eccentric part; 21B-bent axle second eccentric part; 22-rotor; 23-motor stator; 24-housing; 25-low pressure compression chamber; 26-upper bracket; 27-orbiter; 28-fixed scroll; 29-dividing plate; 30-seal member; 31-hiigh pressure stage compression unit discharge chamber; 32-oil supply mechanism; 33-hiigh pressure stage compression unit exhaust outlet; 34-cold-producing medium outlet; 35-high pressure compressed chamber; 36-hiigh pressure stage compression unit tonifying Qi circulation passage.
Detailed description of the invention
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The specific embodiment of the present invention is for the ease of having further description to design of the present invention, the technical problem solved, the technical characteristic forming technical scheme and the technique effect that brings.It should be noted that, the explanation for these embodiments does not form limitation of the invention.In addition, just can mutually combine as long as the technical characteristic related in embodiments of the present invention described below does not form conflict each other.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limiting the scope of the invention can not be interpreted as.
Due to existing compressor single tonifying Qi loop not only air compensation be restricted, and the problem that the tonifying Qi effect brought when cannot overcome actual operating mode off-design operating mode declines, the invention provides a kind of compressor, refrigeration system and cooling compressor increase the method for gas, by arranging tonifying Qi entrance respectively from low to high on the compression chamber of at least two compression units arranged successively of arbitrarily downgrading, cold-producing medium can enter the compression chamber of each compression unit by corresponding tonifying Qi inlet selective, thus increase the refrigerant flow entering each compression unit, thus increase the capacity of compressor, improve the refrigerant flow through condenser, because the cold-producing medium between evaporimeter and condenser is without the heat exchange of evaporimeter, its temperature is low compared with the temperature of the cold-producing medium entering compressor through evaporator, thus can reduce the delivery temperature of compressor, ensures compressor safe operation.The method that cooling compressor provided by the invention increases gas can carry out between flash-pot and condenser cold-producing medium by Appropriate application, makes compressor have higher efficiency.
In a schematic embodiment of compressor of the present invention, shown in composition graphs 1 and Fig. 2, compressor 1 comprise have respectively with the refrigerant suction port 13 of the outlet of evaporimeter 10 and the compressor reducer of cold-producing medium outlet 34 that is communicated with the entrance of condenser 4, compressor reducer comprises at least two compression units of to arbitrarily downgrade along flow of refrigerant the direction rotor-type compressor 2 of the low-pressure stage arranged and the scroll compressor 3 of hiigh pressure stage from low to high, the compression chamber of each compression unit is respectively equipped with tonifying Qi entrance, as shown in Figure 1, the high pressure compressed chamber 35 of the scroll compressor 3 of hiigh pressure stage is provided with the first tonifying Qi entrance 14, the low pressure compression chamber 25 of the rotor-type compressor 2 of low-pressure stage is provided with the second tonifying Qi entrance 15, each tonifying Qi entrance can receive the cold-producing medium between flash-pot 10 and condenser 4, cold-producing medium optionally can enter the compression chamber of each compression unit, to increase through condensing agent outlet and to flow to the refrigerant flow of condenser.
In this schematic embodiment, by arranging tonifying Qi entrance respectively from low to high on the compression chamber of at least two compression units arranged successively of arbitrarily downgrading, the i.e. first tonifying Qi entrance 14 in the second tonifying Qi entrance 15 of the low pressure compression chamber 25 of rotor-type compressor 2 and the high pressure compressed chamber 35 of scroll compressor 3, as shown in Figure 1, first tonifying Qi entrance 14 is by being arranged on the airtight passage 36 in the fixed scroll 28 of the screw compressor 3 of hiigh pressure stage, be communicated with the high pressure compressed chamber 35 of the centre of screw compressor 3, the cold-producing medium come between flash-pot 10 and condenser 4 optionally can enter the low pressure compression chamber 25 of rotor-type compressor 2 by the second tonifying Qi entrance 15, or the high pressure compressed chamber 35 of scroll compressor 3 is entered by the first tonifying Qi entrance 14, low pressure compression chamber 25 and high pressure compressed chamber 35 can certainly be entered simultaneously, the cold-producing medium additionally entered from tonifying Qi entrance increases the refrigerant flow of the compression unit entered, thus increase the capacity of compressor, improve the refrigerant flow through condenser 4, improve the heating capacity of condenser 4, because the cold-producing medium between evaporimeter 10 and condenser 4 is without the heat exchange of evaporimeter 4, its temperature is low compared with the temperature entering the cold-producing medium of compressor through evaporator 4, thus can reduce the delivery temperature of compressor, ensures compressor safe operation.
It should be noted that, at least two compression units in this schematic embodiment comprise the structure that two compression units are compressors for convenience of explanation, and at least two compression units can also be multiple compression unit arranged from low to high successively of arbitrarily downgrading.Wherein, select the rotor-type compressor 2 of low-pressure stage and the scroll compressor 3 of hiigh pressure stage can make full use of the simple and high performance advantage of scroll compressor of rotor-type compressor structure as two stages of compression unit, compared to common two-stage compressor, there is the high advantage of compact conformation, good reliability and compression performance.As shown in Figure 1, first cold-producing medium through evaporator 10 enters the rotor compressor 2 of low-pressure stage by refrigerant suction port 13, the low pressure compression chamber 25 in airtight housing 24 is discharged into after overcompression, cold-producing medium after the rotor compressor 2 of low-pressure stage compresses is sucked by the scroll compressor 3 of hiigh pressure stage, and after overcompression, be discharged to high pressure compressed chamber 35, discharge compressor 1 by cold-producing medium outlet 34 afterwards and enter condenser 4.Separated by dividing plate 29 and seal member 30 between high pressure compressed chamber 35 and low pressure compression chamber 25.
The present invention also accordingly provides a kind of refrigeration system, as shown in Figure 3 and Figure 4, refrigeration system comprises condenser 4, the compressor 1 of evaporimeter 10 and above-described embodiment, pipeline between condenser 4 and evaporimeter 10 is provided with the shunt communicated with the first tonifying Qi entrance 14 and the second tonifying Qi entrance 15, for the cold-producing medium in pipeline is introduced tonifying Qi entrance described in each, the shunt communicated with the first tonifying Qi entrance 14 is provided with the first on-off valve 11, the shunt communicated with the second tonifying Qi entrance 15 is provided with the second on-off valve 12, the break-make of high pressure compressed chamber 35 and low pressure compression chamber 25 is entered for controlling cold-producing medium respectively, cold-producing medium can enter high pressure compressed chamber 35 by the first on-off valve 11 and the first tonifying Qi entrance 14, also low pressure compression chamber 25 can be entered by the second on-off valve 12 and the second tonifying Qi entrance 15, on the one hand, the cold-producing medium additionally entered from tonifying Qi entrance increases the refrigerant flow of the compression unit entered, thus increase the capacity of compressor, improve the refrigerant flow through condenser 4, improve the heating capacity of condenser 4, on the other hand, because the cold-producing medium between evaporimeter 10 and condenser 4 is without the heat exchange of evaporimeter 4, its temperature is low compared with the temperature entering the cold-producing medium of compressor through evaporator 4, thus can reduce the delivery temperature of compressor, ensures compressor safe operation.In refrigeration or press smaller operating mode, optionally can close the first on-off valve 11 or the second on-off valve 12 or close two on-off valves simultaneously, thus ensureing to compress facility under light load and cooling condition and have and have higher energy efficiency.
As the first preferred embodiment of inventive refrigeration system, shown in composition graphs 1 and Fig. 3, refrigeration system also comprises flow controller and flash vessel, flow controller comprises first throttle valve 5, flash vessel comprises the first flash vessel 6, the inlet of the first flash vessel 6 is communicated by the outlet of first throttle valve 5 with condenser 4, the liquid outlet of the first flash vessel 6 communicates with the entrance of evaporimeter 10 by arranging choke valve 9, the steam (vapor) outlet of the first flash vessel 6 is divided into two-way and connects the shunt communicated with the first tonifying Qi entrance 14 and the second tonifying Qi entrance 15 respectively, make the steam generated by the first flash vessel 6 can enter low pressure compression chamber 25 or high pressure compressed chamber 35 respectively, when not improving system cost, obtain good heating capacity and performance.As shown in Figure 2, flash vessel 6 is entered from the cold-producing medium becoming gas-liquid mixture phase after condenser 4 liquid refrigerant is out after first throttle valve 5 throttling, the saturated vapor that the ratio pressure at expulsion be evaporated is low can be selected to be added in the high pressure compressed chamber 35 of screw compressor 3 by the first tonifying Qi entrance 14 according to operating condition, or is added in the low pressure compression chamber 25 of rotor compressor 2 by the second tonifying Qi entrance 15.Be saturated vapor due to what enter tonifying Qi entrance, comparatively compressor compresses chamber inner refrigerant temperature is lower for its temperature, thus can reduce the delivery temperature of compressor, ensures compressor safe operation.In addition, under operating mode severe especially, the first tonifying Qi entrance 14 also can fill into the liquid refrigerant through throttling, and the second tonifying Qi loop 15 still fills into saturated vapor, like this can while lifting heating capacity, more effective reduction delivery temperature, guarantees compressor reliability service.
As the second preferred embodiment of inventive refrigeration system, flash vessel comprises along the series connection of flow of refrigerant direction and distinguishes the corresponding sub-flash vessel arranged with each compression unit, each steam (vapor) outlet of the sub-flash vessel arranged from downstream along flow of refrigerant direction from upstream communicates with each tonifying Qi entrance of at least two compression units arranged from high to low of arbitrarily downgrading with being corresponding in turn to, as shown in Figure 4, with above-mentioned first preferred embodiment unlike, sub-flash vessel comprises the first flash vessel 6 being positioned at upstream and the second flash vessel 8 being positioned at downstream, flow controller comprises first throttle valve 5 before the inlet being separately positioned on the first flash vessel 6 and the second flash vessel 8 and second throttle 7, first flash vessel 6 and the second flash vessel 8 are in being connected in series, the steam (vapor) outlet of the first flash vessel 6 is communicated with the first tonifying Qi entrance 14 by the first on-off valve 11, the steam (vapor) outlet of the second flash vessel 8 is communicated with the second tonifying Qi entrance 15 by the second on-off valve 12, from system condenser 4 liquid refrigerant out, the first flash vessel 6 is entered after first throttle valve 5 first time throttling, the saturated vapor that the ratio pressure at expulsion be evaporated is low is added in the high pressure compressed chamber 35 of screw compressor 3 by the first tonifying Qi entrance 14.Liquid refrigerant in first order flash vessel 6 enters second level flash vessel 8 after the throttling of second throttle 7 second time, and the saturated vapor that the pressure be evaporated is lower is added in the low pressure compression chamber 25 of rotor compressor 2 by the second tonifying Qi entrance 15.Through twice tonifying Qi, the capacity of compressor 1 increases, and can improve the refrigerant flow through condenser 4 to greatest extent, thus improves heating capacity.Because the cold-producing medium supplemented from the second tonifying Qi entrance 15 is through twice throttling, compare and existing air compensating system, its tonifying Qi temperature is lower, can better cooling motor 23, the efficiency of lifting motor 23.
Fig. 4 is the thermodynamic cyclic process of the compressor of the second preferred embodiment, and wherein a-b section is the compression stage of rotor compressor 2, enters screw compressor 3 with after the steam of k-l section second tonifying Qi entrance 15.In first compression institute's stage that c-d section is screw compressor 3, continue to compress in screw compressor 3 with after the gas and vapor permeation of h-i section first tonifying Qi entrance 14, i.e. e-f section process.F-g section is that gaseous refrigerant enters condenser 4 heat release and becomes liquid refrigerant process, then enters first order flash vessel 6 through throttling, and isolates saturated vapor and saturated liquid, be i.e. g-h process.Isolated saturated vapor enters the first tonifying Qi entrance, and isolated liquid refrigerant enters second level flash vessel 8 in the j-k stage through second time throttling, and isolates the lower saturated vapor of pressure and temperature and saturated liquid.Isolated saturated vapor enters the second tonifying Qi entrance 15, and isolated liquid refrigerant enters evaporimeter 10 in the m-n stage after throttling is evaporated to gaseous refrigerant, enters subsequently in compressor 1.
In the embodiment of above-mentioned refrigeration system, refrigeration system can also preferably include controlling organization and testing agency, testing agency can detect the pressure at expulsion of each compression unit and feed back to controlling organization, controlling organization controls the break-make of on-off valve so that optionally cold-producing medium is sent into the compression chamber of each compression unit, is realized the Automated condtrol of tonifying Qi by the cooperation arranging testing agency and controlling organization.
The present invention also further provides a kind of method that can increase gas to cooling compressor, comprising:
Detect the first row atmospheric pressure P of the low-pressure stage compression unit at least two compression units
1, and the second row atmospheric pressure P of hiigh pressure stage compression unit
2;
When default pressure at expulsion Pm is greater than second row atmospheric pressure P
2time, by corresponding tonifying Qi entrance, cold-producing medium is entered the compression chamber of hiigh pressure stage compression unit;
When default pressure at expulsion Pm is at first row atmospheric pressure P
1with second row atmospheric pressure P
2between time, by corresponding tonifying Qi entrance, cold-producing medium is entered the compression chamber of low-pressure stage compression unit;
When default pressure at expulsion Pm is less than first row atmospheric pressure P
1time, stop, by tonifying Qi entrance, cold-producing medium is entered compressor;
There is following relation in the pressure of inspiration(Pi) Ps and the pressure at expulsion Pd that wherein preset pressure at expulsion Pm and compressor:
Pm=k* (Ps*Pd)
0.5, (k=0.8 ~ 1.2), k is pressure at expulsion index.
The scroll compressor 3 of the rotor-type compressor 2 being low-pressure stage at least two compression units and hiigh pressure stage, usually optimum superfeed pressure Pm=k* (Ps*Pd)
0.5, (k=0.8 ~ 1.2), k is pressure at expulsion index.
And the pressure at expulsion of low-pressure stage rotor compressor 2 (pressure namely in low pressure compression chamber 25) is approximately:
P
1≈Ps*(Vs
2/Vs
1)
λ
Wherein, Vs
1, Vs
2be respectively low-pressure stage and high pressure stage compressor aspirated volume, λ is cake compressibility.
In the high pressure compressed chamber 35 of hiigh pressure stage screw compressor 3 tonifying Qi position, pressure is approximately:
P
2≈P
1*(Vs
2/V
2)
λ。
Wherein, V
2for the volume in high pressure compressed chamber 35.
Because tonifying Qi position can change with the change of operating mode Suck and exhaust pressure, use the method can ensure that actual superfeed pressure is positioned near optimum superfeed pressure all the time, therefore compressor 1 can all have higher tonifying Qi effect and performance in the condition range of broadness.
Illustrate that the control procedure of the first on-off valve 11 and the second on-off valve 12 is as follows for the second embodiment below:
Work as Pm<P
1time, because exhaust and pressure of inspiration(Pi) are smaller, system loading is low, now can not tonifying Qi, the first tonifying Qi entrance 14 and the second tonifying Qi entrance 15 is closed by the first on-off valve 11 and the second on-off valve 12.
Work as P
1<Pm<P
2time, opened by the second on-off valve 12, the first on-off valve 11 is closed, and is added in low pressure compression chamber 25 by cold-producing medium by the second tonifying Qi entrance 15.
Work as Pm>P
2time, opened by the first on-off valve 11, the second on-off valve 12 is closed, and is added in the compression chamber 35 of screw compressor 3 by cold-producing medium by the first tonifying Qi entrance 14.
The embodiment more than combined is described in detail for embodiments of the present invention, but the present invention is not limited to described embodiment.Such as at least two compression units can also be multiple compression unit arranged from low to high successively of arbitrarily downgrading; for a person skilled in the art, when not departing from principle of the present invention and connotation, multiple change, amendment are carried out to these embodiments, equivalence is replaced and modification still falls within protection scope of the present invention.
Claims (7)
1. a compressor (1), comprise have respectively with the refrigerant suction port (13) of the outlet of evaporimeter (10) and the compressor reducer of cold-producing medium outlet (34) that is communicated with the entrance of condenser (4), it is characterized in that, described compressor reducer comprises at least two compression units arranged of arbitrarily downgrading along flow of refrigerant direction from low to high, the compression chamber of each described compression unit is respectively equipped with tonifying Qi entrance, tonifying Qi entrance described in each can receive from the cold-producing medium between described evaporimeter and described condenser, described cold-producing medium optionally can enter the compression chamber of compression unit described in each, to increase through described condensing agent outlet and to flow to the refrigerant flow of described condenser (4).
2. compressor according to claim 1 (1), is characterized in that, described at least two compression units comprise the rotor-type compressor (2) of low-pressure stage and the scroll compressor (3) of hiigh pressure stage.
3. a refrigeration system, it is characterized in that, comprise condenser (4), evaporimeter (10) and the compressor described in claim 1 or 2 (1), pipeline between described condenser (4) and described evaporimeter (10) is provided with the shunt be communicated with tonifying Qi entrance described in each, for the cold-producing medium in described pipeline is introduced tonifying Qi entrance described in each, described in each, being provided with corresponding on-off valve along separate routes, entering the break-make of the compression chamber of compression unit described in each for controlling described cold-producing medium respectively.
4. refrigeration system according to claim 3, it is characterized in that, also comprise flow controller and flash vessel, the inlet of described flash vessel is communicated by the outlet of described flow controller with described condenser (4), the liquid outlet of described flash vessel communicates with the entrance of described evaporimeter (10), the steam (vapor) outlet of described flash vessel communicates with described shunt, makes the steam generated by described flash vessel can enter the compression chamber of compression unit described in each respectively.
5. refrigeration system according to claim 4, it is characterized in that, described flash vessel comprise along the series connection of flow of refrigerant direction and with the respectively corresponding sub-flash vessel arranged of compression unit described in each, each steam (vapor) outlet of the described sub-flash vessel arranged from downstream along flow of refrigerant direction from upstream with arbitrarily downgrade arrange from high to low described in each tonifying Qi entrances of at least two compression units communicate with being corresponding in turn to.
6. refrigeration system according to claim 3, it is characterized in that, also comprise controlling organization and testing agency, described testing agency can detect the pressure at expulsion of compression unit described in each and feed back to controlling organization, and described controlling organization controls the break-make of described on-off valve described optionally cold-producing medium to be sent into the compression chamber of compression unit described in each.
7. to the method increasing gas based on cooling compressor according to claim 1, can comprise:
Detect the first row atmospheric pressure P of the low-pressure stage compression unit at least two compression units
1, and the second row atmospheric pressure P of hiigh pressure stage compression unit
2;
When default pressure at expulsion Pm is greater than second row atmospheric pressure P2, by corresponding described tonifying Qi entrance, described cold-producing medium is entered the compression chamber of described hiigh pressure stage compression unit;
When default pressure at expulsion Pm is at first row atmospheric pressure P
1and time between second row atmospheric pressure P2, by corresponding described tonifying Qi entrance, cold-producing medium is entered the compression chamber of described low-pressure stage compression unit;
When default pressure at expulsion Pm is less than first row atmospheric pressure P
1time, stop, by described tonifying Qi entrance, described cold-producing medium is entered described compressor;
There is following relation in the pressure of inspiration(Pi) Ps and the pressure at expulsion Pd that wherein preset pressure at expulsion Pm and described compressor:
Pm=k* (Ps*Pd)
0.5, (k=0.8 ~ 1.2), k is pressure at expulsion index.
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| CN105953386A (en) * | 2016-05-30 | 2016-09-21 | 珠海格力电器股份有限公司 | Control method and device of double-stage air-supplementing enthalpy-increasing system |
| CN107202011A (en) * | 2016-03-16 | 2017-09-26 | 株式会社日立产机系统 | Compound compressor |
| CN109162923A (en) * | 2018-09-13 | 2019-01-08 | 格力电器（杭州）有限公司 | Compressor, air conditioning system and control method of compressor |
| CN111102190A (en) * | 2019-11-25 | 2020-05-05 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor, air conditioning system and control method |
| CN112747510A (en) * | 2019-10-31 | 2021-05-04 | 广东美的白色家电技术创新中心有限公司 | Liquid storage and oil distribution device, compressor assembly, heat exchange system and electrical equipment |
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