CN104949376A - Multi-split system and control method - Google Patents
Multi-split system and control method Download PDFInfo
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- CN104949376A CN104949376A CN201510296855.8A CN201510296855A CN104949376A CN 104949376 A CN104949376 A CN 104949376A CN 201510296855 A CN201510296855 A CN 201510296855A CN 104949376 A CN104949376 A CN 104949376A
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- line system
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- pressure
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/024—Compressor control by controlling the electric parameters, e.g. current or voltage
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a multi-split system and a control method. The multi-split system comprises a four-way valve, an outdoor heat exchanger, an oil separator, a low-pressure tank, a compressor and a first outdoor machine stop valve, wherein four valve ports of the four-way valve are communicated with the oil separator, the first outdoor machine stop valve, the low-pressure tank and the outdoor heat exchanger respectively through pipelines, the oil separator is communicated with the compressor through an oil return pipe, a compressor oil inlet pipe is arranged on the compressor, an oil outlet main pipe is further arranged on the oil separator, the oil outlet main pipe is communicated with the compressor oil inlet pipe, the oil outlet main pipe is further communicated with the low-pressure tank through an air outlet pipe with an air return temperature sensing bulb installed therein, and an air exhaust pressure sensor is installed on the pipeline between the oil separator and the four-way valve. The control method comprises the steps of detecting a temperature value Ts of the low-pressure side of the multi-split system and calculating the temperature value Ts to convert the temperature value Ts into a saturation pressure value Ps; comparing the pressure value Ps with an allowed pressure value of the multi-split system and regulating and controlling the multi-split system. According to the multi-split system and the control method, the structure is simple, the detection is precise, the cost is low, and the multi-split system is protected to be stably operated.
Description
Technical field
The present invention relates to air conditioner technical field, particularly relate to a kind of multiple on-line system and control method.
Background technology
Multi-connected machine is widely used in big-and-middle-sized various environment because of its ability efficiency, good cooling or heating effect and installation and maintenance easily.Simultaneously, air-cooled multi-connected machine is due to its inherent characteristic, for winter environment temperature region on the low side, air-cooled multi-connected machine heating capacity is at low temperatures very important, thus how to make the rational controlling run of multi-connected machine seem even more important under low temperature condition.
The main following methods of the control mode of large multi-connected machine to pressure of current main flow: one all uses pressure sensor for high-pressure side and low-pressure side, the feature of the method controls accurately, but do not have cost advantage; Another kind method is for only to use high-side sensor, the impact considering low-pressure lateral pressure is not gone in the design of Systematical control point, and it can save departmental cost, but meeting may be in some cases, outside the admissible scope of compressor, there is the hidden danger to compressor damage in the parameter point of system cloud gray model.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of multiple on-line system and control method, overcomes that traditional multiple on-line system cost is high, system cloud gray model certainty of measurement is low, easily damages the defect of compressor.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of multiple on-line system, comprises cross valve, outdoor heat exchanger, return-air temperature-sensitive bag, back pressure transducer, oil eliminator, low pressure tank, compressor, first off-premises station stop valve, control module, four valve ports of described cross valve by pipeline respectively with the exhaust outlet of described oil eliminator, described first off-premises station stop valve, the air inlet of described low pressure tank, described outdoor heat exchanger is communicated with, the oil return opening of described oil eliminator is communicated with by the oil-out of oil return pipe with described compressor, the oil-in of described compressor is provided with compressor oil inlet pipe, the oil-out of described oil eliminator is provided with fuel-displaced house steward, described fuel-displaced house steward is communicated with described compressor oil inlet pipe, described fuel-displaced house steward is also communicated with by the gas outlet of escape pipe with described low pressure tank, described back pressure transducer is arranged on the pipeline between described oil eliminator and described cross valve, described return-air temperature-sensitive bag is arranged on described escape pipe, described return-air temperature-sensitive bag, described back pressure transducer, described compressor is all electrically connected with described control module.
The invention has the beneficial effects as follows: structure is simple, easy for installation, convenient operation and maintenance, cost is low, improves the degree of accuracy of measuring multiple on-line system runtime parameter, extends the service life of compressor.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described outdoor heat exchanger is provided with outer machine pipeline away from one end of described cross valve, described outer machine pipeline is provided with outer organic electronic expansion valve, described outer organic electronic expansion valve is electrically connected with described control module, and described outer machine pipeline is provided with the second off-premises station stop valve away from one end of described outdoor heat exchanger.
Adopt the beneficial effect of above-mentioned further scheme to be: to make outdoor heat exchanger can stable operation, be conducive to reducing pressure by regulating flow, improve the stability that multiple on-line system is run.
A kind of control method, comprises the following steps:
1) the temperature value Ts of the low-pressure side of the close described low pressure tank of above-mentioned multiple on-line system is detected in real time by return-air temperature-sensitive bag and record;
2) according to the physical property of refrigerant by step 1) in the temperature value Ts that detects convert saturation pressure force value Ps corresponding with it to;
3) detected the exhaust pressure value Pd of described oil eliminator in real time by back pressure transducer, and by control module by step 2) in calculate conversion the force value that allows with this multiple on-line system together of pressure value P s contrast;
4) if step 3) in the contrast of two force value meet default required value, continue to run described multiple on-line system, if step 3) in two force value contrasts depart from default required value, regulate and control described multiple on-line system by control module and make it normally run.
The invention has the beneficial effects as follows: method is simple, it is easy to operate to measure, save cost, makes the detection data of multiple on-line system more accurate simultaneously, improves the service life of multiple on-line system.
Further, according to step 3) in the exhaust pressure value Pd that detects in real time calculate actual compression ratio K, the computing formula of described actual compression ratio K is: K=(Pd+0.1)/(Ps+0.1).
Adopt the effective of above-mentioned further scheme: the data that the high-pressure side of multiple on-line system is drawn by measured pressure value are more accurate.
Further, when step 3) described in the force value that allows of multiple on-line system when being maximal pressure ratio K s, contrasted by described actual compression ratio K and described maximal pressure ratio K s, and select the described multiple on-line system of regulation and control to realize the regulation and control of described actual compression ratio according to comparing result.
Adopt the effective of above-mentioned further scheme: flexible operation is simple, which kind of operation can be taked to carry out reference for next step by Data Comparison.
Further, the regulate and control method of described multiple on-line system comprise by described control module operate the unlatching of the outer organic electronic expansion valve of described multiple on-line system or closedown, described multiple on-line system outer organic electronic expansion valve open large or turn down, the increase of the running frequency of described compressor in described multiple on-line system or reduction.
Adopt the effective of above-mentioned further scheme: simple to operation, and can effectively regulate the force value of multiple on-line system to make to meet the permissible value of multiple on-line system.
Further, when step 3) described in the force value that allows of multiple on-line system when being critical low pressure value Pk, described saturation pressure force value Ps and described critical low pressure value Pk contrasts, and carries out data analysis contrast and select the described multiple on-line system of regulation and control to run by control module.
Adopt the effective of above-mentioned further scheme: contrast with critical low pressure value, better can detect the ruuning situation of multiple on-line system, thus make suitable system regulation.
Further; described critical low pressure value Pk draws according to the compressor operating frequency of described multiple on-line system, described exhaust pressure value Pd and operational factor; and when described saturation pressure force value Ps is less than described critical low pressure value Pk; described multiple on-line system is just shut down after running according to Preset Time, thus protects described multiple on-line system.
Adopt the effective of above-mentioned further scheme: simple and effectively protect multiple on-line system, improve service life.
Further, described operational factor comprises at least one item in described multiple on-line system pressure, the degree of superheat, degree of supercooling, low voltage value, Suck and exhaust pressure.
The beneficial effect of above-mentioned further scheme is adopted to be: to be contrasted by above-mentioned parameter, the accuracy of contrast number can be improved.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of multiple on-line system of the present invention;
Fig. 2 is the control logic sketch of the embodiment one of a kind of control method of the present invention.
In accompanying drawing, the list of parts representated by each label is as follows:
1, low pressure tank, 2, compressor, 3, oil eliminator, 4, cross valve, 5, outdoor heat exchanger, 6, outer organic electronic expansion valve, 7, the first off-premises station stop valve, the 8, second off-premises station stop valve, 9, return-air temperature-sensitive bag, 10, back pressure transducer, 11, fuel-displaced house steward, 12, compressor oil inlet pipe, 13, escape pipe, 14, oil return pipe, 15, outer machine pipeline, 16, control module.
Detailed description of the invention
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, this multiple on-line system comprises cross valve 4, outdoor heat exchanger 5, return-air temperature-sensitive bag 9, back pressure transducer 10, oil eliminator 3, low pressure tank 1, compressor 2, first off-premises station stop valve 7, control module 16.Four valve ports of described cross valve 4 are communicated with the exhaust outlet of described oil eliminator 3, described first off-premises station stop valve 7, the air inlet of described low pressure tank 1, described outdoor heat exchanger 5 respectively by pipeline.The oil return opening of described oil eliminator 3 is communicated with the oil-out of described compressor 2 by oil return pipe 14.The oil-in of described compressor 2 is provided with compressor oil inlet pipe 12, the oil-out of described oil eliminator 3 is provided with fuel-displaced house steward 11, described fuel-displaced house steward 11 is communicated with described compressor oil inlet pipe 12, and described fuel-displaced house steward 11 is also communicated with the gas outlet of described low pressure tank 1 by escape pipe 13.Described back pressure transducer 10 is arranged on the pipeline between described oil eliminator 3 and described cross valve 4, detects the on high-tension side pressure of this multiple on-line system in real time by back pressure transducer 10.Described return-air temperature-sensitive bag 9 is arranged on described escape pipe 13, is detected the temperature of this multiple on-line system low-pressure side by return-air temperature-sensitive bag 9 in real time.Fall in love in the situation of low temperature, low pressure tank 1 has often been in liquid refrigerants state, carries out detecting the real time temperature of escape pipe 13 thus the real-time detection realized low pressure tank 1 temperature that are connected with low pressure tank 1 by return-air temperature-sensitive bag 9.On the pipeline that the air inlet that temperature temperature-sensitive bag also can be arranged on low pressure tank 1 is communicated with cross valve 4, also can realize the real-time detection of this multiple on-line system low-side temperature.
As shown in Figure 1, described outdoor heat exchanger 5 is provided with outer machine pipeline 15 away from one end of described cross valve 4, described outer machine pipeline 15 is provided with outer organic electronic expansion valve 6, and described outer machine pipeline 15 is provided with the second off-premises station stop valve 8 away from one end of described outdoor heat exchanger 5.This multiple on-line system system is in cold-starting and running, dispelled the heat by outdoor heat exchanger 5, by return-air temperature-sensitive bag 9, the temperature of this multiple on-line system low-pressure side is detected in real time, the real-time detection of force value is exhausted by the high-pressure side of back pressure transducer 10 to this multiple on-line system, and by data transformations contrasting with multiple on-line system permissible value, thus the frequency of the compressor 2 of this multiple on-line system of regulable control or valve body carry out controlling this multiple on-line system normally runs.
As shown in Figure 1, return-air temperature-sensitive bag 9, back pressure transducer 10, compressor 2, outer organic electronic expansion valve 6 are all electrically connected with control module 16.Control module 16 receive return-air temperature-sensitive bag 9, back pressure transducer 10 data and analyze, thus adjustment control compressor 2, outer organic electronic expansion valve 6 operation.
Adopt following control method to carry out control operation for above-mentioned multiple on-line system, comprise the following steps:
1) detect in real time the temperature value Ts of this multiple on-line system low-pressure side and record by return-air temperature-sensitive bag 9, low-pressure side is positioned at the import and export near described low pressure tank 1; 2) according to the physical property of refrigerant by step 1) in the temperature value Ts that detects convert saturation pressure force value Ps corresponding with it to; 3) detected in real time the exhaust pressure value Pd of described oil eliminator 3 by back pressure transducer 10, and by control module 16 by step 2) in calculate the force value that the pressure value P s that changes allows with this multiple on-line system together and contrast and analyze; 4) if step 3) in the contrast of two force value meet default required value, continue to run described multiple on-line system, if step 3) in two force value contrasts depart from default required value, regulate and control described multiple on-line system by control module 16 and make it normally run.
There is following embodiment for above-mentioned control method, but be not limited to following examples.
Embodiment one:
As shown in Figure 2, when step 3) described in the force value that allows of multiple on-line system when being maximal pressure ratio K s, in the cold-starting and running of this multiple on-line system, first detect the temperature value Ts of described escape pipe 13 in real time by described return-air temperature-sensitive bag 9 and temperature value Ts is sent in control module 16, and according to the physical property of refrigerant, temperature value Ts being converted into saturation pressure force value Ps corresponding with it by control module 16.Then, the on high-tension side exhaust pressure value Pd of described oil eliminator 3 is detected in real time by described back pressure transducer 10, being sent to by exhaust pressure value Pd in control module 16 and calculating actual compression ratio K, the computing formula of described actual compression ratio K is: K=(Pd+0.1)/(Ps+0.1); Then control module 16 carries out described actual compression ratio K and described maximal pressure ratio K s comparative analysis, and selects the described multiple on-line system of regulation and control to realize the regulation and control of described actual compression ratio according to comparing result control module 16; The regulate and control method of control module 16 comprise the unlatching of the outer organic electronic expansion valve 6 of described multiple on-line system or closedown, described multiple on-line system outer organic electronic expansion valve 6 open large or turn down, the increase of the running frequency of described compressor 2 in described multiple on-line system or in reducing any one or severally to operate simultaneously.When the actual compression ratio K of multiple on-line system is greater than the maximal pressure ratio K s of this multiple on-line system permission; the actual motion compression ratio that the running frequency of the outer organic electronic expansion valve 6 or adjustment compressor 2 that just adjust multiple on-line system by control module 16 realizes this multiple on-line system is with within the scope of the maximal pressure ratio K s meeting this multiple on-line system and run, thus protection and control this multiple on-line system.
Embodiment two:
When step 3) described in the force value that allows of multiple on-line system when being critical low pressure value Pk, in the cold-starting and running of above-mentioned multiple on-line system, first the temperature value Ts of described escape pipe 13 is detected in real time by described return-air temperature-sensitive bag 9, and be sent in control module 16 by temperature value Ts, and according to the physical property of refrigerant, temperature value Ts is converted into saturation pressure force value Ps corresponding with it by control module 16; Then pass through control module 16 by described saturation pressure force value Ps and described critical low pressure value Pk comparative analysis, and select the described multiple on-line system of regulation and control to run according to comparing result; When described saturation pressure force value Ps is less than described critical low pressure value Pk, control module 16 control described multiple on-line system run a period of time according to Preset Time after just out of service, thus protect described multiple on-line system.Wherein, described critical low pressure value Pk is drawn according to compressor 2 running frequency of described multiple on-line system, described exhaust pressure value Pd and operational factor by control module 16, and described operational factor comprises at least one item in described multiple on-line system pressure, the degree of superheat, degree of supercooling, low voltage value, Suck and exhaust pressure.
This control method detects the temperature value of this multiple on-line system low-pressure side in real time by temperature temperature-sensitive bag, more accurate by the data detecting real time temperature detection, cost is low, also avoid the system operational parameters detected not allow in parameter area in system simultaneously, avoid causing complete hidden danger, while meeting security, reduce cost by this multiple on-line system and control method.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a multiple on-line system, it is characterized in that, comprise cross valve (4), outdoor heat exchanger (5), return-air temperature-sensitive bag (9), back pressure transducer (10), oil eliminator (3), low pressure tank (1), compressor (2), first off-premises station stop valve (7), control module (16), four valve ports of described cross valve (4) by pipeline respectively with the exhaust outlet of described oil eliminator (3), described first off-premises station stop valve (7), the air inlet of described low pressure tank (1), described outdoor heat exchanger (5) is communicated with, the oil return opening of described oil eliminator (3) is communicated with the oil-out of described compressor (2) by oil return pipe (14), the oil-in of described compressor (2) is provided with compressor oil inlet pipe (12), the oil-out of described oil eliminator (3) is provided with fuel-displaced house steward (11), described fuel-displaced house steward (11) is communicated with described compressor oil inlet pipe (12), described fuel-displaced house steward (11) is also communicated with the gas outlet of described low pressure tank (1) by escape pipe (13), described back pressure transducer (10) is arranged on the pipeline between described oil eliminator (3) and described cross valve (4), described return-air temperature-sensitive bag (9) is arranged on described escape pipe (13), described return-air temperature-sensitive bag (9), described back pressure transducer (10), described compressor (2) is all electrically connected with described control module (16).
2. a kind of multiple on-line system according to claim 1, it is characterized in that, described outdoor heat exchanger (5) is provided with outer machine pipeline (15) away from one end of described cross valve (4), described outer machine pipeline (15) is provided with outer organic electronic expansion valve (6), described outer organic electronic expansion valve (6) is electrically connected with described control module (16), and described outer machine pipeline (15) is provided with the second off-premises station stop valve (8) away from one end of described outdoor heat exchanger (5).
3. a control method for multiple on-line system as claimed in claim 1 or 2, is characterized in that, comprises the following steps:
1) the temperature value Ts of the low-pressure side of the close described low pressure tank (1) of this multiple on-line system is detected in real time by return-air temperature-sensitive bag (9) and record;
2) according to the physical property of refrigerant by step 1) in the temperature value Ts that detects convert saturation pressure force value Ps corresponding with it to;
3) detected in real time the exhaust pressure value Pd of described oil eliminator (3) by back pressure transducer (10), and by control module (16) by step 2) in calculate the force value that the pressure value P s that changes allows with this multiple on-line system together and contrast;
4) if step 3) in the contrast of two force value meet default required value, continue to run described multiple on-line system, if step 3) in two force value contrasts depart from default required value, regulate and control described multiple on-line system by control module (16) and make it normally run.
4. a kind of control method according to claim 3, it is characterized in that, described control module (16) is according to step 3) in the exhaust pressure value Pd that detects in real time calculate actual compression ratio K, the computing formula of described actual compression ratio K is: K=(Pd+0.1)/(Ps+0.1).
5. a kind of control method according to claim 4, it is characterized in that, when step 3) described in the force value that allows of multiple on-line system when being maximal pressure ratio K s, contrasted by described actual compression ratio K and described maximal pressure ratio K s, and select the described multiple on-line system of regulation and control to realize the regulation and control of described actual compression ratio according to comparing result.
6. a kind of control method according to claim 5, it is characterized in that, the regulate and control method of described multiple on-line system comprise by described control module (16) operate the unlatching of the outer organic electronic expansion valve (6) of described multiple on-line system or closedown, described multiple on-line system outer organic electronic expansion valve (6) open large or turn down, the increase of the running frequency of described compressor (2) in described multiple on-line system or reduction.
7. a kind of control method according to claim 3, it is characterized in that, when step 3) described in the force value that allows of multiple on-line system when being critical low pressure value Pk, described saturation pressure force value Ps and described critical low pressure value Pk contrasts, and carries out data analysis contrast and select the described multiple on-line system of regulation and control to run by control module (16).
8. a kind of control method according to claim 7; it is characterized in that; described critical low pressure value Pk draws according to compressor (2) running frequency of described multiple on-line system, described exhaust pressure value Pd and operational factor; and when described saturation pressure force value Ps is less than described critical low pressure value Pk; described control module (16) controls just to shut down after described multiple on-line system is run according to Preset Time, thus protects described multiple on-line system.
9. a kind of control method according to claim 8, is characterized in that, described operational factor comprises at least one item in described multiple on-line system pressure, the degree of superheat, degree of supercooling, low voltage value, Suck and exhaust pressure.
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| CN201510296855.8A CN104949376A (en) | 2015-06-02 | 2015-06-02 | Multi-split system and control method |
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| CN201510296855.8A CN104949376A (en) | 2015-06-02 | 2015-06-02 | Multi-split system and control method |
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| CN105509356A (en) * | 2016-01-20 | 2016-04-20 | 佛山市顺德区美的饮水机制造有限公司 | Water refrigeration device and refrigeration system and refrigeration method thereof |
| CN106679239A (en) * | 2017-01-19 | 2017-05-17 | 珠海格力电器股份有限公司 | Compressor oil return and liquid return control method and device and air conditioning system |
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| CN106679239A (en) * | 2017-01-19 | 2017-05-17 | 珠海格力电器股份有限公司 | Compressor oil return and liquid return control method and device and air conditioning system |
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