CN102538273A - Vapor-injected air-conditioning system, vapor-injected air-conditioning control method and air-conditioner - Google Patents
Vapor-injected air-conditioning system, vapor-injected air-conditioning control method and air-conditioner Download PDFInfo
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Abstract
The invention provides a vapor-injected air-conditioning system, a vapor-injected air-conditioning control method and an air-conditioner, which can solve the problems of incapability of refrigerant flow adjustment, complex structure, poor refrigerating/heating effect and the like of the prior art. The technical scheme includes that the vapor-injected air-conditioning system comprises a compressor, a controller, a four-way valve, a condenser, an evaporator, a flash evaporator, an electromagnetic valve and refrigerant pipes. Two refrigerant pipe connector ends of the flash evaporator are arranged at the refrigerant pipes between the evaporator and the condenser and connected with the refrigerant pipes on the respective side, a refrigerant outlet at one end of the flash evaporator is connected with the compressor through one refrigerant pipe provided with a one-way valve and the electromagnetic valve, and an electronic expansion valve is arranged on the refrigerant pipe arranged between the condenser and the flash evaporator. A vapor-injected flow control system is simplified, cost is reduced, refrigerant flow control of the system is optimized by using the electronic expansion valve for controlling, and refrigerating and heating performances are improved.
Description
Technical field
The invention belongs to air-conditioning and Refrigeration Engineering technical field, specifically, relate to a kind of tonifying Qi of adopting electric expansion valve dynamically to adjust flow and increase the enthalpy air-conditioning system.
Background technology
Existing tonifying Qi increases the air-conditioning system of enthalpy, all adopts capillary to carry out throttling, and tonifying Qi and restriction separation structure are complicated, can't realize dynamic refrigerant flow adjusting, and cost is high, and heating effect still can not be given full play to.
Fig. 1 is the air-conditioning system that a kind of tonifying Qi of form increases enthalpy, and referring to Fig. 1, this technical scheme flow process is:
When kind of refrigeration cycle, magnetic valve A9 in the system and magnetic valve B18 are closed condition.The kind of refrigeration cycle flow process: compressor 1 is discharged the HTHP cold media gas, behind cross valve 5, gets into condenser 6, becomes subcooled liquid after the cooling; Get into indoor evaporator 19 through check valve A8 and capillary A12; Become low-temp low-pressure gas, get back to compressor 1, after compressor 1 compression through cross valve 5, gas-liquid separator 2; Become high temperature and high pressure gas, with this reciprocation cycle.
When heating, magnetic valve B18 opens, and magnetic valve A9 is according to outdoor temperature situation switch.Heat circulation process: the HTHP cold media gas that compressor 1 is discharged, get into indoor evaporator 19 through cross valve 5, after evaporimeter 19 coolings, become subcooled liquid; Subcooled liquid gets into flash vessel 14 after capillary D16 throttling, in flash vessel 14, partially liq becomes gas and gets into compressor 1 through check valve C17 and magnetic valve B18; Remaining liquid gets into capillary B11 and capillary C10 through check valve B13, and (when outdoor temperature was high, magnetic valve A9 opened, and cold-producing medium passes through capillary B11 and capillary C10 simultaneously; Outdoor temperature is crossed when hanging down; Magnetic valve A9 closes, and cold-producing medium only passes through capillary B11), inlet chamber external condenser 6 behind capillary-compensated; After condenser 6 evaporations become low-temp low-pressure gas; Get into compressors 1 through cross valve 5 and gas-liquid separator 2, after compressor 1 compresses, become the gas of HTHP together to the gas of compressor 1, circulate with this with magnetic valve B18.
The deficiency that this prior art exists is, 1, can find out that by Fig. 1 and above-mentioned two kinds of flow processs circulation this air-conditioning system need dispose 4 groups of capillaries, 3 check valves, 2 magnetic valves; System architecture is complicated, and the cyclic process controlling unit is many, and adopts capillary-compensated; Can't carry out cold medium flux regulates; System's refrigerating/heating weak effect, Energy Efficiency Ratio is low, and system cost is high.During 2, owing to kind of refrigeration cycle, refrigerant does not get into flash vessel, thereby needs polygamy to put a circuits, disposes two circuits complex structures, and can not in kind of refrigeration cycle, carry out the control of refrigerant dynamic adjustments, is difficult to improve systematic function.
Summary of the invention
The invention provides a kind of tonifying Qi and increase enthalpy air-conditioning system and control method and air-conditioner, it can solve the cold medium flux that can't carry out of prior art existence and regulate complex structure, problems such as refrigerating/heating weak effect.
The objective of the invention is for raising system refrigeration, heating effect, adopt electric expansion valve to carry out dynamic refrigerant flow and regulate, both simplified cold-producing medium control system, reduce cost, improved the cooling or heating effect of system again.
In order to reach the purpose that solves the problems of the technologies described above, technical scheme of the present invention is that a kind of tonifying Qi increases the enthalpy air-conditioning system; Comprise compressor, controller, cross valve, condenser, evaporimeter, flash vessel, magnetic valve and refrigerant pipe; Said flash vessel has three refrigerant interface tubes, and wherein, a refrigerant interface tube is provided with said flash vessel one end; This refrigerant interface tube is a refrigerant exit; Other two refrigerant interface tubes are set up in parallel the other end at said flash vessel, and two refrigerant interface tube ends of said flash vessel are arranged on the refrigerant pipeline place between said evaporimeter and the said condenser, and two refrigerant interface tubes connect the refrigerant pipe of a side separately respectively; The refrigerant exit of said flash vessel one end links to each other with compressor through the refrigerant pipe; This refrigerant pipe is provided with first check valve and said magnetic valve, and the conducting direction of said first check valve is the direction of flash vessel towards compressor, and the refrigerant pipe between said condenser and the said flash vessel is provided with electric expansion valve.
The present invention also has following supplementary technology scheme:
Refrigerant pipe between said flash evaporation device and the said evaporimeter is provided with the capillary and second check valve, said capillary is parallelly connected with said second check valve, and during refrigerating state, said second check valve is conducting.
Two refrigerant interface tubes arranged side by side of said flash vessel are arranged on said flash vessel bottom, and another refrigerant interface tube is arranged on said flash vessel top.
When kind of refrigeration cycle, refrigerant advances from one of them refrigerant interface of said flash vessel bottom, goes out from another refrigerant interface; Heating circulation time, one of them refrigerant interface tube advances refrigerant from said flash vessel bottom, and another refrigerant interface and top refrigerant interface go out from the bottom.
The long tubular of said flash vessel, its volume scope is the 0.35-0.65 liter.
On the blast pipe between said cross valve and the said compressor, be provided with high-voltage switch gear; On the air intake duct between said cross valve and the said compressor, be provided with low tension switch; Said condenser and said evaporimeter middle part are equipped with temperature sensor, on said compressor suction duct and blast pipe, are equipped with temperature sensor.
A kind of tonifying Qi increases the control method of enthalpy air-conditioning system; During kind of refrigeration cycle, confirming a target super heat value according to chamber, internal and external environment temperature, is actual super heat value with the difference of said compressor air suction temperature-evaporimeter middle part temperature; If actual super heat value is greater than the target super heat value; Said electric expansion valve is opened valve control, if actual super heat value less than the target super heat value, is then closed valve control to said electric expansion valve;
Heat circulation time; Confirm a target super heat value according to chamber, internal and external environment temperature; With compressor air suction temperature-condenser middle part temperature gap is actual super heat value, and greater than the target super heat value, said electric expansion valve is opened valve control as if actual super heat value; If actual super heat value less than the target super heat value, is then closed valve control to said electric expansion valve.
Said target super heat value then reduces said target super heat value when excessive discharge temperature, if delivery temperature is low excessively, then increase the target super heat value, and said delivery temperature scope is 65-90 ℃.
A kind of air-conditioner includes the technical scheme that above-mentioned tonifying Qi increases the enthalpy air-conditioning system.
A kind of air-conditioner includes the technical scheme that above-mentioned tonifying Qi increases enthalpy air-conditioning system control method.
Refrigerating/heating of the present invention circulates as follows: during kind of refrigeration cycle, and compressor start, the HTHP cold media gas gets into condenser through cross valve; Behind cold air, become subcooled liquid, subcooled liquid gets into flash vessel through the electric expansion valve throttling; Because magnetic valve is in closed condition; Refrigerant flows out through check valve entering indoor evaporator from the outlet of flash vessel, and refrigerant becomes low-temp low-pressure gas after the indoor evaporator evaporation, get back to compressor behind gas process cross valve and the gas-liquid separator; Compressor is compressed into the gas of low-temp low-pressure the gas entering condenser of HTHP again, circulates with this.During freezing, closed electromagnetic valve, electric expansion valve is regulated aperture automatically according to the degree of superheat and compressor air-discharging.
Heat circulation time, compressor start, high temperature and high pressure gas gets into indoor evaporator through cross valve; After evaporator cools, become subcooled liquid, behind capillary-compensated, get into flash vessel; In flash vessel; Part liquid becomes gas and directly gets into compressor through check valve and magnetic valve, and all the other liquid flow out from flash vessel, passes through electric expansion valve inlet chamber external condenser after the throttling again; At condenser evaporation becoming low-temp low-pressure gas; Low-temp low-pressure gas is gone into compressor through cross valve and gas-liquid separator are laggard, and compressor gets into indoor evaporator with low-temp low-pressure gas with from the gas that the gas that flash vessel gets into press is compressed into HTHP together, circulates with this.During heating, magnetic valve is opened control according to outdoor environment temperature and system pressure, electric current, delivery temperature situation.
From technical scheme of the present invention, can find out; The present invention adopts flash vessel is configured on the refrigerant pipeline between condenser and the evaporimeter; Make the refrigerant flash vessel of when the refrigerating/heating state, all can flowing through, and adopted electric expansion valve, and the capillary and second check valve.Thereby can carry out dynamic flow through electric expansion valve and regulate, the refrigerating/heating performance is improved, and saves a circuits and respective one-way valve and magnetic valve, and structure is obviously simplified, and cost reduces.
The present invention compared with prior art has the following advantages and good effect:
1, adopt the electric expansion valve throttling, according to the operation of air conditioner situation, dynamic debugging system cold medium flux, operation of air conditioner are in optimum state, and be safe and efficient energy-conservation.And prior art adopts capillary-compensated, and cold medium flux is uncontrollable.
2, go out mode under advancing under flash vessel adopts, this mode can guarantee that when refrigeration, cold-producing medium can arrive indoor set through flash evaporation smoothly; Compared with prior art; Need not independent refrigeration throttle circuit is set, both simplified flow process and reduced cost, can realize the dynamic adjustments of cold-producing medium again.
It is thus clear that the present invention has simplified tonifying Qi and has increased the enthalpy flow control system, has reduced cost, adopt electronic expansion valve controls simultaneously, the refrigerant flow control of optimization system has improved and has heated and refrigeration performance.Adopt air-conditioning system of the present invention, can realize the unsteady flow amount control of cold-producing medium, can be used for many on-line systems.
Description of drawings
Fig. 1 is the air-conditioning system figure that the tonifying Qi of existing a kind of form increases enthalpy,
1, compressor; 2, gas-liquid separator; 3, low tension switch; 4, high-voltage switch gear; 5, cross valve; 6, condenser; 7, filter A; 8, check valve A; 9, magnetic valve A; 10, capillary C; 11, capillary B; 12, capillary A; 13, check valve B; 14, flash vessel; 15, filter B; 16, capillary D; 17, check valve C; 18, magnetic valve B; 19, evaporimeter; 20, stop valve A; 21, stop valve B; 22, refrigerant pipeline;
Fig. 2 is the air-conditioning system figure that tonifying Qi of the present invention increases enthalpy;
1, compressor; 2, gas-liquid separator; 3, low tension switch; 4, high-voltage switch gear; 5, cross valve; 6, condenser; 6-1, condenser middle part temperature sensor; 7, filter A; 8, electric expansion valve; 9, flash vessel; 10, first check valve; 11, magnetic valve; 12, capillary; 13, second check valve; 14, filter B; 15, evaporimeter; 15-1, evaporimeter middle part temperature sensor; 16, stop valve A; 17, stop valve B; 18, refrigerant pipe; 19, compressor suction duct temperature sensor; 20, compressor exhaust pipe temperature sensor.
Fig. 2-the 1st, the flash vessel front view in the air-conditioning system of the present invention;
Fig. 2-the 2nd, the upward view of Fig. 2-1;
Fig. 2-the 3rd, the refrigerant flash vessel sketch map of flowing through during kind of refrigeration cycle;
Fig. 2-the 4th heats the circulation time refrigerant flash vessel sketch map of flowing through;
9, flash vessel; 9-1, refrigerant exit; 9-2, refrigerant interface tube; 9-3, refrigerant interface tube; 18-1, condenser side refrigerant pipe; 18-2, vaporizer side refrigerant pipe.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in detail.
Referring to Fig. 2; Increase the existing problem of enthalpy air-conditioning system in order to solve existing tonifying Qi; The present invention improves system; Concrete technical scheme is: said tonifying Qi increases the enthalpy air-conditioning system and comprises compressor 1, controller (not shown among Fig. 2), cross valve 5, condenser 6, evaporimeter 15, flash vessel 9, magnetic valve 11 and refrigerant pipe 18.Referring to Fig. 2-1, Fig. 2-2, Fig. 2-3 and Fig. 2-4; Said flash vessel 9 has three refrigerant interface tubes; A refrigerant interface tube 9-1 is provided with said flash vessel upper end, and this refrigerant interface tube is a refrigerant exit, and other two refrigerant interface tube 9-2,9-3 are set up in parallel the lower end at said flash vessel 9.
2 refrigerant interface tube 9-2,9-3 are import/exports of refrigerant, and when kind of refrigeration cycle, refrigerant interface tube 9-2 is the refrigerant import, and refrigerant interface tube 9-3 is a refrigerant exit, referring to Fig. 2-3; Heating circulation time, refrigerant interface tube 9-3 is the refrigerant import, and refrigerant interface tube 9-2 is a refrigerant exit, referring to Fig. 2-4.Two refrigerant interface tube ends of said flash vessel 9 lower ends are arranged on the refrigerant pipeline place between said evaporimeter 15 and the said condenser 6; Two refrigerant interface tube 9-2,9-3 connect the refrigerant pipe of a side separately respectively; Connect refrigerant pipe 18-1 like refrigerant interface 9-2, refrigerant interface 9-3 connects refrigerant pipe 18-2.The refrigerant exit 9-1 of said flash vessel 9 upper ends links to each other with compressor 1 through the refrigerant pipe; This refrigerant pipe is provided with first check valve 10 and said magnetic valve 11; The conducting direction of said first check valve 10 is the direction of flash vessel 9 towards compressor 1, and the refrigerant pipe between said condenser and the said flash vessel is provided with electric expansion valve 8.Refrigerant pipe between said flash evaporation device 9 and the said evaporimeter 15 is provided with the capillary 12 and second check valve 13; Said capillary 12 is parallelly connected with said second check valve 13, and during refrigerating state, said second check valve 13 is for conducting; When heating state, the 13 not conductings of said second check valve.
Said flash vessel 9 long tubulars, the volume scope of its cavity is the 0.35-0.65 liter.In the present embodiment, said flash vessel 9 volumes are 0.5 liter, referring to Fig. 2-1, Fig. 2-2, Fig. 2-3 and Fig. 2-4.
On the blast pipe between said cross valve 5 and the said compressor 1, be provided with high-voltage switch gear 4, on the air intake duct between said cross valve 5 and the said compressor 1, be provided with low tension switch 3.
In order dynamically to control cold medium flux effectively, make that the measurement temperature is accurate, said condenser 6 middle parts are provided with temperature sensor 6-1, and said evaporimeter 15 middle parts are provided with temperature sensor 15-1.On said compressor 1 air intake duct and blast pipe, be equipped with temperature sensor 19,20.
Referring to Fig. 2, during kind of refrigeration cycle, compressor 1 starts; The HTHP cold media gas gets into condenser 6 through cross valve 5, after condensation, becomes subcooled liquid, and subcooled liquid is through electric expansion valve 8 throttlings; Get into flash vessel 9 from refrigerant pipe 18-1 through the refrigerant import 9-2 of flash vessel 9, because magnetic valve 11 is in closed condition, the upper end closed of flash vessel 9 just; Referring to Fig. 2-3, refrigerant can only flow out from the outlet 9-3 of flash vessel 9, gets into indoor evaporator 15 through check valve 13; Refrigerant becomes low-temp low-pressure gas after indoor evaporator 15 evaporations; Get back to compressor 1 behind gas process cross valve 5 and the gas-liquid separator 2, compressor 1 is compressed into the gas of low-temp low-pressure the gas entering condenser 6 of HTHP again, circulates with this.During freezing, magnetic valve 11 cuts out, and electric expansion valve 8 is regulated aperture automatically according to the degree of superheat and compressor air-discharging.
Heat circulation time, compressor 1 starts, and high temperature and high pressure gas gets into indoor evaporator 15 through cross valve 5; After evaporimeter 15 coolings, become subcooled liquid, after capillary 12 throttlings; Get into flash vessel 9 through refrigerant pipe 18-2 and flash vessel inlet tube 9-3, because magnetic valve 11 is in opening state, in flash vessel 9; Part liquid flows out from the refrigerant exit 9-1 on flash vessel 9 tops, becomes gas and directly gets into compressor 1 through check valve 10 and magnetic valve 11, and all the other liquid flow out to refrigerant pipe 18-1 from the outlet 9-2 of flash vessel 9; Referring to Fig. 2-4; Refrigerant passes through electric expansion valve 8 inlet chamber external condenser 6 after the throttling again again, becomes low-temp low-pressure gas in condenser 6 evaporations, and low-temp low-pressure gas is through cross valve 5 and gas-liquid separator 2 back entering compressor 1; Compressor 1 gets into indoor evaporator 15 with low-temp low-pressure gas with from the gas that the gas that flash vessel 9 gets into compressors 1 is compressed into HTHP together, circulates with this.During heating, magnetic valve 11 is opened control according to outdoor environment temperature and system pressure, electric current, delivery temperature situation.
Dynamic throttling control of the present invention (electric expansion valve 8 controls): said air-conditioner is when kind of refrigeration cycle; Controller receives and is used for indoor environment temperature value and the outdoor environment temperature value that the inside and outside environment temperature sensor of sensing chamber collects, and then determines a target super heat value according to chamber, internal and external environment temperature; Receive the compressor air suction temperature and the evaporimeter middle part temperature that are installed on the suction temperature sensor 19 at compressor suction duct place and are installed on the middle part temperature sensor 15-1 collection output at evaporimeter middle part then respectively; The difference of said compressor air suction temperature and evaporimeter middle part temperature is compared as actual super heat value and described target super heat value; If actual super heat value greater than the target super heat value, is then opened the valve operation to said electric expansion valve 8; If actual super heat value less than the target super heat value, is then closed the valve operation to said electric expansion valve 8.The target super heat value then reduces the target super heat value when excessive discharge temperature, if delivery temperature is low excessively, then increase the target super heat value.
When heating, confirming a target super heat value according to chamber, internal and external environment temperature, is actual super heat value with compressor 1 suction temperature value-condenser 6 middle part temperature gaps; If actual super heat value is greater than the target super heat value; Electric expansion valve 8 is opened valve control, increases open degree, and then electric expansion valve 8 closes valve control on the contrary; Turn down open degree, and then dynamically control cold medium flux.The target super heat value then reduces the target super heat value when excessive discharge temperature, if delivery temperature is low excessively, then increase the target super heat value.When heating, electric expansion valve 8 is under different outdoor environment temperatures, and the aperture scope is different.
The delivery temperature scope of said compressor is 65-90 ℃.
Through the dynamic adjustments of electric expansion valve 8, can reach the actual super heat value purpose identical with the target super heat value, heat and refrigeration performance and Energy Efficiency Ratio thereby improve air-conditioning.
It is thus clear that air-conditioning system of the present invention is simple in structure, cost is low, and can dynamically control cold-producing medium, thereby has improved the air-conditioning system performance.
The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made other form, and any professional and technical personnel of being familiar with possibly utilize the technology contents of above-mentioned announcement to change or be modified as the equivalent embodiment of equivalent variations.Allly do not break away from technical scheme content of the present invention, to any simple modification, equivalent variations and remodeling that above embodiment did, still belong to the protection domain of technical scheme of the present invention according to technical spirit of the present invention.
Claims (10)
1. a tonifying Qi increases the enthalpy air-conditioning system; Comprise compressor, controller, cross valve, condenser, evaporimeter, flash vessel, magnetic valve and refrigerant pipe; Said flash vessel has three refrigerant interface tubes, and wherein, a refrigerant interface tube is provided with said flash vessel one end; This refrigerant interface tube is a refrigerant exit; Other two refrigerant interface tubes are set up in parallel the other end at said flash vessel, it is characterized in that: two refrigerant interface tube ends of said flash vessel are arranged on the refrigerant pipeline place between said evaporimeter and the said condenser, and two refrigerant interface tubes connect the refrigerant pipe of a side separately respectively; The refrigerant exit of said flash vessel one end links to each other with compressor through the refrigerant pipe; This refrigerant pipe is provided with first check valve and said magnetic valve, and the conducting direction of said first check valve is the direction of flash vessel towards compressor, and the refrigerant pipe between said condenser and the said flash vessel is provided with electric expansion valve.
2. a kind of tonifying Qi according to claim 1 increases the enthalpy air-conditioning system; It is characterized in that: the refrigerant pipe between said flash evaporation device and the said evaporimeter is provided with the capillary and second check valve; Said capillary is parallelly connected with said second check valve; During refrigerating state, said second check valve is conducting.
3. a kind of tonifying Qi according to claim 1 and 2 increases the enthalpy air-conditioning system, it is characterized in that: two refrigerant interface tubes arranged side by side of said flash vessel are arranged on said flash vessel bottom, and another refrigerant interface tube is arranged on said flash vessel top.
4. a kind of tonifying Qi according to claim 3 increases the enthalpy air-conditioning system, it is characterized in that: when kind of refrigeration cycle, refrigerant advances from one of them refrigerant interface of said flash vessel bottom, goes out from another refrigerant interface; Heating circulation time, one of them refrigerant interface tube advances refrigerant from said flash vessel bottom, and another refrigerant interface and top refrigerant interface go out from the bottom.
5. a kind of tonifying Qi according to claim 4 increases the enthalpy air-conditioning system, it is characterized in that: the long tubular of said flash vessel, its volume scope is the 0.35-0.65 liter.
6. a kind of tonifying Qi according to claim 1 and 2 increases the enthalpy air-conditioning system; It is characterized in that: on the blast pipe between said cross valve and the said compressor, be provided with high-voltage switch gear; On the air intake duct between said cross valve and the said compressor, be provided with low tension switch; Said condenser and said evaporimeter middle part are equipped with temperature sensor, on said compressor suction duct and blast pipe, are equipped with temperature sensor.
7. claim 1 or 2 said tonifying Qi increase the control method of enthalpy air-conditioning system; It is characterized in that: during kind of refrigeration cycle, confirming a target super heat value according to chamber, internal and external environment temperature, is actual super heat value with the difference of said compressor air suction temperature-evaporimeter middle part temperature; If actual super heat value is greater than the target super heat value; Said electric expansion valve is opened valve control, if actual super heat value less than the target super heat value, is then closed valve control to said electric expansion valve;
Heat circulation time; Confirm a target super heat value according to chamber, internal and external environment temperature; With compressor air suction temperature-condenser middle part temperature gap is actual super heat value, and greater than the target super heat value, said electric expansion valve is opened valve control as if actual super heat value; If actual super heat value less than the target super heat value, is then closed valve control to said electric expansion valve.
8. method according to claim 7 is characterized in that: said target super heat value then reduces said target super heat value when excessive discharge temperature, if delivery temperature is low excessively, then increases the target super heat value, and said delivery temperature scope is 65-90 ℃.
9. air-conditioner is characterized in that: include that the described a kind of tonifying Qi of any claim increases the enthalpy air-conditioning system among the claim 1-6.
10. air-conditioner is characterized in that: include the control method that any described tonifying Qi of claim among the claim 7-9 increases the enthalpy air-conditioning system.
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