CN203432025U - Expansion valve ejection control system - Google Patents
Expansion valve ejection control system Download PDFInfo
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- CN203432025U CN203432025U CN201320539224.0U CN201320539224U CN203432025U CN 203432025 U CN203432025 U CN 203432025U CN 201320539224 U CN201320539224 U CN 201320539224U CN 203432025 U CN203432025 U CN 203432025U
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Abstract
The utility model discloses an expansion valve ejection control system. The expansion valve ejection control system comprises a main control unit, a compressor, an indoor heat exchanger and an outdoor heat exchanger, wherein the main control unit is used for acquiring data, processing data and controlling output; an exhaust port of the compressor is connected with a connector D of a four-way valve through a pipeline; a connector E of the four-way valve is connected with a first port of the indoor heat exchanger through a pipeline; a connector S of the four-way valve is connected with an air suction port of the compressor through a pipeline; a connector C of the four-way valve is connected with a first port of the outdoor heat exchanger through a pipeline. The expansion valve ejection control system further comprises an economizer. The economizer comprises a first heat exchange channel and a second heat exchange channel, wherein one end of the first heat exchange channel is connected with a second port of the indoor heat exchanger through a second electronic expansion valve. According to the expansion valve ejection control system, in the ejection process, air supply quantity is made to be in the optimal state through dynamic regulation of the opening of the electronic expansion valve, and the advantages that the air supply enthalpy increasing compressor improves low temperature heating capacity, increases the energy efficiency ratio and substantially increases condensate depression of a main path at the time of refrigeration are reflected to the maximum extent.
Description
Technical field
The invention belongs to air conditioner controlling technology field, specifically, relate to a kind of injection electric expansion valve control system.
Background technology
Spray at present increasing enthalpy compressor that air-conditioning system is used and mostly be two kinds, digital code spray-jet compressor and frequency conversion injection compressor, and spray regime is also divided into two kinds: flash tank sprays with economizer and sprays, use the spray regime of flash tank to exist emitted dose cannot precisely control and the easy shortcoming of liquid hammer, solution is to confirm by experiment minimum emitted dose, to guarantee under any circumstance liquid hammer can not to occur, but now the advantage of spraying cannot embody completely, the magnetic valve of controlling in addition injection break-make has forward to reveal, the shortcoming of the reverse complete conducting of 0.5bar pressure reduction, oppositely reveal and affect reliability, there is abnormal sound in the conducting of forward pressure reduction, spray and compare with flash tank, economizer injection has advantages of can ensure compressor reliability service, yet, the unlatching of the jet expansion valve that economizer sprays cannot accurately judge opportunity, and general only control sprayed the degree of superheat after opening, emitted dose cannot be adjusted to optimum, for multi-connected machine system, also not yet there is at present frequency conversion to spray and increase the precedent that enthalpy compressor is combined with multi-connected machine system, it is fast that reason is that jet expansion valve is difficult in multi-connected machine system loading excursion large (machine moment shutdown or start in part) and speed, in the changeable situation of installation and use condition, accurately control, be difficult to accomplish reliable and efficiently get both.
Based on this, how to invent a kind of expansion valve jet control system, can accomplish reliable and efficiently get both so that economizer spray regime is accurately controlled in the situation that service condition is changeable, be the technical problem that the present invention mainly solves.
Summary of the invention
The present invention is in order to solve existing open cannot correctly select in connected system time and efficient control sprayed electric expansion valve, easily jet band liquid damages the problem of compressor, a kind of expansion valve jet control system is provided, can judge unlatching, close the electric expansion valve condition of spraying, expansion valve can be controlled emitted dose in the reasonable scope by rationally controlling expansion valve opening after opening, and improves efficiency.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of expansion valve jet control system, comprise for data acquisition, data processing and the main control unit of controlling output, compressor, indoor heat exchanger, outdoor heat exchanger, the exhaust outlet of described compressor is connected with the D interface of cross valve by pipeline, the E interface of described cross valve is connected with the first port of indoor heat exchanger by pipeline, the S interface of described cross valve is connected with the air entry of compressor by pipeline, the C interface of described cross valve is connected with the first port of outdoor heat exchanger by pipeline, also comprise economizer, described economizer comprises the first heat exchanger channels and the second heat exchanger channels, one end of described the first heat exchanger channels is connected with the second port of indoor heat exchanger by the second electric expansion valve, other one end of the first heat exchanger channels is successively by the 3rd electric expansion valve, outdoor heat exchanger outlet temperature sensor is connected with the second port of outdoor heat exchanger, the outlet side of described the second heat exchanger channels is successively by temperature sensor before spraying, check valve is connected with the gas supplementing opening of compressor, other one end of described the second heat exchanger channels is successively by temperature sensor after throttling, the first electric expansion valve is connected with the second port of indoor heat exchanger, on the pipeline between the exhaust outlet of described compressor and the D interface of cross valve, be provided with exhaust gas temperature sensor, for detection of delivery temperature,
Temperature sensor before described injection, for detection of temperature before spraying;
Temperature sensor after described throttling, for detection of temperature after throttling;
Described outdoor heat exchanger outlet temperature sensor, for detection of outdoor heat exchanger outlet temperature;
On described outdoor heat exchanger, be provided with the outer coil temperature sensor for detection of outer coil pipe middle part temperature, on described indoor heat exchanger, be provided with the inner coil pipe temperature sensor for detection of inner coil pipe middle part temperature.
Further, on the pipeline between the exhaust outlet of described compressor and the D interface of cross valve, be also provided with high-pressure sensor, for detection of the exhaust absolute pressure of compressor;
On the pipeline between the air entry of described compressor and the S interface of cross valve, be also provided with low-pressure sensor, for detection of the air-breathing absolute pressure of compressor.
Further again, described compressor increases enthalpy DC frequency-changeable compressor for spraying.Described injection increases enthalpy air-conditioning system and also comprises a plurality of described indoor sets that are arranged in parallel.
Compared with prior art, advantage of the present invention and good effect are: expansion valve jet control system of the present invention sprays increasing enthalpy compressor by frequency conversion is combined with multi-connected machine system, feedback by high-low pressure pressure (for exhaust absolute pressure/air-breathing absolute pressure value) with economizer out temperature sensor (for temperature after temperature, throttling before spraying), accurately control injection valve aperture, both can guarantee compressor reliability, by electric expansion valve dynamic adjustments emitted dose, make system in optimum state again.If interior machine opens suddenly or cuts out and feed back by the variation of compressor frequency, the aperture of electric expansion valve is regulated in real time, the sudden change that has overcome load causes a difficult problem for liquid hammer generation.
Read by reference to the accompanying drawings after the detailed description of embodiment of the present invention, it is clearer that the other features and advantages of the invention will become.
Accompanying drawing explanation
Fig. 1 is the control flow chart of expansion valve ejection control method proposed by the invention;
Fig. 2 is correction factor a curve map in embodiment mono-;
Fig. 3 is correction factor b curve map in embodiment mono-;
Fig. 4 is correction factor c curve map in embodiment mono-;
Fig. 5 is coefficient e curve map in embodiment mono-;
Fig. 6 is expansion valve jet control system figure structure schematic representation in embodiment mono-;
Fig. 7 is expansion valve jet control system block diagram in embodiment mono-.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in more detail.
Embodiment mono-, and the expansion valve ejection control method in the present embodiment and system are applicable to adopt economizer spray regime to carry the multi-connected machine system of frequency conversion injection compressor; The present embodiment, in connection with expansion valve jet control system, describes the principle of expansion valve ejection control method of the present invention and system in detail, shown in Figure 1, and the expansion valve ejection control method of the present embodiment comprises the following steps:
Spray and open determining step Step22,
Under refrigeration mode, first, determine target degree of supercooling, then, by current degree of supercooling and the comparison of target degree of supercooling, if current degree of supercooling≤target degree of supercooling+error D1 opens jet mode;
Under heating mode, first, calculate and open index, then, if index K >=1 is opened in judgement, open jet mode;
Wherein: a is compressor frequency correction factor;
B is compression ratio correction factor;
C is the corresponding saturation temperature correction factor of low pressure;
Determining step Step21 is closed in injection,
Under refrigeration mode, if spray electric expansion valve, close to minimum valve aperture and current degree of supercooling >=target degree of supercooling+design margin D2, close jet mode.
It should be noted that, in spraying unlatching determining step, the required minimum subcooled temperature of interior machine is to calculate by the interior machine online length of tube corresponding with it with the height fall of outer machine, height fall is distinguished by the dial-up of interior machine with long pipe arrangement, by CPU, identify and calculate, by controlling current degree of supercooling≤target degree of supercooling+error D1, open jet mode, effectively stopped the abnormal sound problem producing because of high drop and long pipe arrangement, D1 considers the deviation that the reasons such as the error of calculation cause.
In injection, close in determining step, when meeting to spray, close after condition, valve opening closes to 0 step.
Calculate in the formula of opening index K, 0.25,0.35,0.4 is weight ratio, according to experiment situation, can finely tune.
Control method in the present embodiment is by spraying the thermistor after electric expansion valve throttling, before spraying, thermistor equitemperature sensor coordinates the method for controlling with system high-low pressure pressure sensor, solved in the time of cannot correctly selecting in connected system and opened and the efficient problem of spraying electric expansion valve of controlling, and the problem that has solved jet band liquid damage compressor, method provided by the present invention can judge unlatching, close the electric expansion valve condition of spraying, expansion valve can be controlled emitted dose in the reasonable scope by rationally controlling expansion valve opening after opening, improve efficiency.
Shown in Fig. 2～Fig. 4, the present embodiment has provided respectively the curve map of compressor frequency correction factor a and compressor rotary speed, compression ratio correction factor b and compression ratio, low pressure corresponding saturation temperature correction factor c and low pressure corresponding temperature, wherein, compressor rotary speed parameter feeds back to main control unit by compressor, compression ratio is calculated by main control unit, for exhaust absolute pressure/air-breathing absolute pressure value, the corresponding saturation temperature of low pressure is the corresponding saturation temperature value of air-breathing absolute pressure, and this value also has main control unit to calculate.By the three width forms of Fig. 2～Fig. 4 are deposited in to main control unit, main control unit can be found a, b, tri-coefficient values of c in real time.
Preferably, in order to protect compressor, be conducive to extend its service life, in injection, close in determining step, no matter under refrigeration or heating mode, if when normal temperature control or manual shut-down, also close jet mode.
Shown in Figure 6, be this expansion valve jet control system block diagram, and the present embodiment injection increasing enthalpy air-conditioning system can also comprise a plurality of described indoor sets that are arranged in parallel, to form multi-connected machine system.Comprise for data acquisition, data processing and the main control unit (not shown) of controlling output, compressor 11, indoor heat exchanger 12, outdoor heat exchanger 13, the exhaust outlet of compressor 11 is connected with the D interface of cross valve by pipeline, the E interface of cross valve is connected with the first port of indoor heat exchanger 12 by pipeline, the S interface of cross valve is connected with the air entry of compressor 11 by pipeline, the C interface of cross valve is connected with the first port of outdoor heat exchanger 13 by pipeline, also comprise economizer 14, economizer 14 comprises the first heat exchanger channels 21 and the second heat exchanger channels 22, one end of the first heat exchanger channels 21 is connected with the second port of indoor heat exchanger 12 by the second electric expansion valve 15, other one end of the first heat exchanger channels 21 is successively by the 3rd electric expansion valve 16, outdoor heat exchanger outlet temperature sensor is connected with the second port of outdoor heat exchanger 13, the outlet side of the second heat exchanger channels 22 of described economizer 14 is successively by temperature sensor 5 before spraying, check valve 17 is connected with the gas supplementing opening of compressor 11, other one end of the second heat exchanger channels 22 is successively by temperature sensor after throttling 7, the first electric expansion valve 6 is connected with the second port of indoor heat exchanger 12, on the pipeline between the exhaust outlet of described compressor 11 and the D interface of cross valve, be provided with exhaust gas temperature sensor 1, for detection of delivery temperature,
After described throttling, temperature sensor 7, for detection of temperature after throttling;
Also comprise outdoor heat exchanger outlet temperature sensor 8, for detection of outdoor heat exchanger outlet temperature;
On outdoor heat exchanger 13, be provided with the outer coil temperature sensor 10 for detection of outer coil pipe middle part temperature, on indoor heat exchanger 12, be provided with the inner coil pipe temperature sensor 4 for detection of inner coil pipe middle part temperature.
Wherein, the first electric expansion valve 6, the second electric expansion valve 15, the 3rd electric expansion valve 16, temperature sensor 5 before spraying, after throttling, temperature sensor 7, outdoor heat exchanger outlet temperature sensor 8, outer coil temperature sensor 10, inner coil pipe temperature sensor 4, exhaust gas temperature sensor 1 is all connected with main control unit, temperature sensor 5 before spraying, after throttling, temperature sensor 7, outdoor heat exchanger outlet temperature sensor 8, outer coil temperature sensor 10, inner coil pipe temperature sensor 4, exhaust gas temperature sensor 1 is as input block, detection signal is sent to main control unit, the first electric expansion valve is as the output block of this control system, by main control unit, control its unlatching, close, and open degree.
In the expansion valve ejection control method of the present embodiment, also comprise control step step31 and step41 in course of injection,
Under refrigeration mode,
Calculate and spray degree of superheat Inj_SH, guaranteeing, under the prerequisite of injection degree of superheat Inj_SH >=F, to detect current degree of supercooling, by current degree of supercooling and minimum required degree of supercooling comparison, if:
The minimum required degree of supercooling+design margin D3 of current degree of supercooling <, controls expansion valve opening and increases,
The minimum required degree of supercooling+design margin D3 of current degree of supercooling >, controls expansion valve opening and reduces,
Current degree of supercooling=minimum required degree of supercooling+design margin D3, controls expansion valve opening constant,
If Inj_SH < F controls expansion valve opening, reduce, its priority is higher than above-mentioned three kinds of situations,
Wherein, F is according to economizer internal pressure drops and sensor measurement precision, tests the parameter drawing by variable working condition, and its span is-2～8 ℃; In the present embodiment, by variable working condition, test, according to economizer internal pressure drops and sensor measurement precision etc., draw 3 ℃, can certainly adjust according to actual conditions.
Design margin D3 mainly considers guaranteeing, under the prerequisite of degree of supercooling, to reduce the impact of spraying high-pressure and refrigeration efficiency, and this temperature can change according to actual conditions, can between 3～10 ℃, adjust in the present embodiment preferably 5 ℃;
Temperature after temperature-throttling before Inj_SH=sprays;
Before described injection, temperature detects by spraying front temperature sensor 5;
After described throttling temperature by throttling after temperature sensor 7 detect;
Under heating mode,
Calculate discharge superheat DSH, meeting discharge superheat DSH≤target DSH+10 ℃ and spray under the condition of degree of superheat Inj_SH >=F,
If:
control expansion valve opening and reduce,
If:
control expansion valve opening and increase,
If:
keep expansion valve opening constant,
If: discharge superheat DSH > target DSH+10 ℃, to control expansion valve opening and increase, its priority is higher than above three kinds of situations,
If Inj_SH < F controls expansion valve opening, reduce, its priority is higher than above four kinds of situations,
Described intermediate injection pressure is that after throttling, temperature deducts the saturation pressure that error D4 converts,
E is theoretical intermediate injection pressure correcting coefficient;
Pd is exhaust absolute pressure;
Ps is air-breathing absolute pressure;
The span of error D4 is 1～5 ℃;
The corresponding saturation temperature of DSH=delivery temperature-pressure at expulsion.
Shown in Figure 5, be the curve map of theoretical intermediate injection pressure correcting coefficient e, by the form of Fig. 5 is deposited in to main control unit, main control unit can be found coefficient e value in real time.
For because falling the former thereby multi-connected machine of adopts pressure sensor not such as cost, the pressure at expulsion of compressor can be calculated by the detected temperature value of outer coil temperature sensor, and the pressure of inspiration(Pi) of compressor can calculate by the average temperature value of inner coil pipe temperature.
Certainly, in order to improve control accuracy, by being also provided with high-pressure sensor 3 on the pipeline between the exhaust outlet at described compressor 11 and the D interface of cross valve, for detection of the exhaust absolute pressure of compressor; On the pipeline between the air entry of described compressor 11 and the S interface of cross valve, be also provided with low-pressure sensor 2, for detection of the air-breathing absolute pressure of compressor.
Under refrigeration mode in control step in course of injection, if there is new interior machine to open, cause compressor frequency to rise, injection valve aperture keeps current constant;
Ruo Yinnei machine close the decline that causes compressor frequency, control expansion valve opening and reduce, the aperture after reducing is:
Target aperture=current aperture * (frequency values before the frequency values/compressor after compressor reduces reduces).
In like manner, under the heating mode in the control step in course of injection, if there is new interior machine to open, cause compressor frequency to rise, injection valve aperture keeps current constant;
Ruo Yinnei machine close the decline that causes compressor frequency, control expansion valve opening and reduce, the aperture after reducing is:
Target aperture=current aperture * (frequency values before the frequency values/compressor after compressor reduces reduces).
Preferably, in spray opening determining step, determine that the method for target degree of supercooling is: calculate the required minimum subcooled temperature of every interior machine, get the maximum of required minimum subcooled temperature in the interior machine of all starts as target degree of supercooling,
Current degree of supercooling=outer coil pipe middle part temperature-outdoor heat exchanger outlet temperature.
Preferably, in spraying unlatching determining step, open index K=a*0.25+b*0.4+c*0.35, the span of error D1 is 1～5 ℃; In injection, close determining step, the span of design margin D2 is 5～15 ℃;
Under heating mode:
Judgement is opened index K≤0.8 o'clock and is closed.
In addition, in spraying unlatching determining step, open after jet mode, control expansion valve and open to initial valve aperture N, wherein N span is 32～300 steps.
Preferably, N value is 60 steps, also can be according to actual conditions adjustment.
Owing to also not yet there being at present frequency conversion to spray, increase the precedent that enthalpy compressor is combined with multi-connected machine system, reason is to spray electric expansion valve and is difficult in multi-connected machine system loading excursion large (machine moment shutdown or start in part) and speed fast, in the changeable situation of installation and use condition, accurately control, be difficult to accomplish reliable with efficiently get both.Control method in the present embodiment increases enthalpy compressor by frequency conversion injection and is combined with multi-connected machine system, feedback by high-low pressure pressure (for exhaust absolute pressure/air-breathing absolute pressure value) with economizer out temperature sensor (for temperature after temperature, throttling before spraying), accurately control injection valve aperture, both can guarantee compressor reliability, by electric expansion valve dynamic adjustments emitted dose, make system in optimum state again.If interior machine opens suddenly or cuts out and feed back by the variation of compressor frequency, the aperture of electric expansion valve is regulated in real time, the sudden change that has overcome load causes a difficult problem for liquid hammer generation.
Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (3)
1. an expansion valve jet control system, comprise for data acquisition, data processing and the main control unit of controlling output, compressor, indoor heat exchanger, outdoor heat exchanger, the exhaust outlet of described compressor is connected with the D interface of cross valve by pipeline, the E interface of described cross valve is connected with the first port of indoor heat exchanger by pipeline, the S interface of described cross valve is connected with the air entry of compressor by pipeline, the C interface of described cross valve is connected with the first port of outdoor heat exchanger by pipeline, it is characterized in that, also comprise economizer, described economizer comprises the first heat exchanger channels and the second heat exchanger channels, one end of described the first heat exchanger channels is connected with the second port of indoor heat exchanger by the second electric expansion valve, other one end of the first heat exchanger channels is successively by the 3rd electric expansion valve, outdoor heat exchanger outlet temperature sensor is connected with the second port of outdoor heat exchanger, the outlet side of described the second heat exchanger channels is successively by temperature sensor before spraying, check valve is connected with the gas supplementing opening of compressor, other one end of described the second heat exchanger channels is successively by temperature sensor after throttling, the first electric expansion valve is connected with the second port of indoor heat exchanger, on the pipeline between the exhaust outlet of described compressor and the D interface of cross valve, be provided with exhaust gas temperature sensor, on described outdoor heat exchanger, be provided with the outer coil temperature sensor for detection of outer coil pipe middle part temperature, on described indoor heat exchanger, be provided with the inner coil pipe temperature sensor for detection of inner coil pipe middle part temperature.
2. expansion valve jet control system according to claim 1, is characterized in that, on the pipeline between the exhaust outlet of described compressor and the D interface of cross valve, is also provided with high-pressure sensor;
On the pipeline between the air entry of described compressor and the S interface of cross valve, be also provided with low-pressure sensor.
3. expansion valve jet control system according to claim 1 and 2, is characterized in that, described compressor increases enthalpy DC frequency-changeable compressor for spraying.
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| CN201320539224.0U CN203432025U (en) | 2013-08-30 | 2013-08-30 | Expansion valve ejection control system |
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| CN103411291A (en) * | 2013-08-30 | 2013-11-27 | 海信（山东）空调有限公司 | Expansion valve injection control method and system |
| CN105091424A (en) * | 2015-09-10 | 2015-11-25 | Tcl空调器(中山)有限公司 | Air conditioner as well as air conditioner refrigerant adjusting method and device |
| CN105180540A (en) * | 2015-10-14 | 2015-12-23 | 珠海格力电器股份有限公司 | Compressor exhaust temperature control method and system of low-temperature enthalpy-spraying intense heat unit |
| CN105485767A (en) * | 2015-12-22 | 2016-04-13 | 珠海格力电器股份有限公司 | Multi-split air conditioning system and control method |
| CN105783211A (en) * | 2014-12-25 | 2016-07-20 | Tcl空调器(中山)有限公司 | Air conditioner and control method thereof |
| CN106352572A (en) * | 2016-08-19 | 2017-01-25 | 广东美的暖通设备有限公司 | Air conditioning system |
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| CN105783211A (en) * | 2014-12-25 | 2016-07-20 | Tcl空调器(中山)有限公司 | Air conditioner and control method thereof |
| CN105783211B (en) * | 2014-12-25 | 2018-11-16 | Tcl空调器(中山)有限公司 | Air conditioner and its control method |
| CN105091424A (en) * | 2015-09-10 | 2015-11-25 | Tcl空调器(中山)有限公司 | Air conditioner as well as air conditioner refrigerant adjusting method and device |
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| US11506430B2 (en) | 2019-07-15 | 2022-11-22 | Climate Master, Inc. | Air conditioning system with capacity control and controlled hot water generation |
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