CN103575006A - Low-temperature refrigeration type air-cooling water chilling unit and control method thereof - Google Patents
Low-temperature refrigeration type air-cooling water chilling unit and control method thereof Download PDFInfo
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Abstract
The invention discloses a low-temperature refrigeration type air-cooling water chilling unit and a control method thereof. The low-temperature refrigeration type air-cooling water chilling unit comprises a refrigeration system, an axial flow fan cooling system and an automatic control system used for controlling the refrigeration system and the axial flow fan cooling system. A condensation pressure control technology of condensation fan stepless speed regulation, a condensation pressure regulation technology of a condensation pressure regulating valve and an intelligent condensation pressure regulation method are combined; the design is reasonable, and the control is intelligent; and the application range is wide in a low-temperature environment, and the lowest operating environment temperature is minus 50 DEG C, so that the unit is guaranteed to operate normally and stably for a long time, and the reliability of the unit is guaranteed.
Description
Technical field
The present invention relates to a kind of wind-cooled cold-water machine, especially a kind of cryogenic refrigeration type wind-cooled cold-water unit and control method thereof.
Background technology
Current communication machine room, particularly large-scale data center, be generally to adopt the indoor end that wind-cooled cold-water machine is the air-conditioning equipment in communication machine room as low-temperature receiver that chilled water is provided, thereby the indoor environment of communication machine room carried out to refrigeration cool-down.Due to the state that substantially runs without interruption in the whole year of the communication apparatus in communication machine room, and caloric value is very large, therefore, for the wind-cooled cold-water machine of communication machine room, generally needs year round cooling operation.
At present existing general wind-cooled cold-water unit, because still needing to start compressor in cold winter, such common wind-cooled cold-water machine freezes, and when outdoor environment is too low, it is too low that compressor displacement is prone to condensing pressure, height pressure reduction is on the low side, exceed the normal range of operation of compressor, cause the problem that refrigeration system feed flow is not enough and oil return is not freely burnt compressor.Although part of generating units has adopted blower fan start-stop or speed governing; for controlling the method for the condensing pressure of refrigeration system; at-10 ℃ or above environment, also has certain effect; if but during in low temperature environment-10 ~-50 more ℃; depend merely on start-stop or speed governing and cannot condensing pressure be realized effectively and being controlled at all, even if because now stop condensation fan completely, because outdoor temperature is very low; condensing pressure can be very low, and reliability cannot be protected.
Therefore,, while operating in the outdoor environment temperature operation of low temperature, there is larger potential safety hazard such common wind-cooled cold-water captain phase.And that the wind-cooled cold-water unit reliability that is applied to data center requires is very high, if there is fault, will cause a large amount of important communications to work, the reliability of the wind-cooled cold-water machine that such is common is difficult to effectively be solved always.
Application number is the wind-cooled cold-water unit > > that mono-kind of 200920241684.9 Chinese patent < < moves under can low temperature environment, change utility model and utilize condensation pressure regulation valve, the effect of condensing pressure by-passing valve and reservoir pressure control valve regulates condensing pressure and the reservoir pressure of stablizing the wind-cooled cold-water unit moving under low temperature environment by the refrigerant flow on air-cooled condenser condensing pressure by-passing valve path and reservoir pressure by pass around regulator road, wind-cooled cold-water unit can be worked under low temperature environment, though but the wind-cooled cold-water unit of this invention can be in environment temperature normal operation during lower than 0 ℃, but cannot regulate well condensing pressure when lower for temperature.
Summary of the invention
The object of the invention is cannot under cryogenic conditions, move in order to overcome in prior art, even break down, cannot guarantee the technological deficiency of the operational reliability problem of data center, a kind of cryogenic refrigeration type wind-cooled cold-water unit is provided, the present invention is broad in low temperature environment accommodation, minimum operation environment temperature is low reaches-50 ℃, and stable and reliable operation, reasonable in design, control intelligence.
Another object of the present invention is to provide the control method of described kind of cryogenic refrigeration type wind-cooled cold-water unit.
Object of the present invention is achieved by the following technical programs:
A kind of cryogenic refrigeration type wind-cooled cold-water unit, comprise refrigeration system, axial flow blower cooling system and for controlling the automatic control system of refrigeration system and axial flow blower cooling system, described refrigeration system is provided with compressor, condensation pressure regulation valve, bypass solenoid valve and liquid pipe magnetic valve, described axial flow blower cooling system comprises axial flow blower buncher and axial flow blower, described automatic control system comprises Intelligent central control system and Axial-flow fan motor speed regulator, described Intelligent central control system Based Intelligent Control regulates compressor, condensation pressure regulation valve, the unlatching of bypass solenoid valve and liquid pipe magnetic valve or close, control the condensing pressure of described Axial-flow fan motor speed regulator step-less adjustment refrigeration system.
The present invention adopts the condensing pressure control technology of condensation fan stepless speed regulation, the condensation pressure regulation method of the condensation pressure regulation technology of condensation pressure regulation valve and intelligence provides a kind of refrigerating operaton at low temperatures reliable and stable cryogenic refrigeration type wind-cooled cold-water unit.
Described refrigeration system also comprises condenser, pressure sensor, hot gas bypass valve, reservoir, filter, expansion valve and evaporimeter, described compressor is provided with blast pipe, described reservoir is provided with feed tube, described condenser two ends are connected with condensation pressure regulation valve with compressor respectively, described condensation pressure regulation valve is connected reservoir with after bypass solenoid valve parallel connection, described reservoir is connected with filter, described filter is connected with liquid pipe magnetic valve, described liquid pipe magnetic valve is connected with expansion valve, described expansion valve is connected with evaporimeter, described evaporimeter connects compressor, described hot gas bypass valve two ends connect respectively the blast pipe of compressor and the feed tube of reservoir.
Described automatic control system comprises inflow temperature sensor, leaving water temperature sensor, traffic protection device, sensor data acquisition system and display operation system; described Intelligent central control system is connected respectively with display operation system with sensor data acquisition system, and described sensor data acquisition system is connected respectively with inflow temperature sensor, leaving water temperature sensor and traffic protection device.
The control method of described cryogenic refrigeration type wind-cooled cold-water unit, Intelligent central control system is according to the Inlet and outlet water Temperature Setting of display operation system, by sensor data acquisition system, gather the inflow temperature sensor in actual motion, leaving water temperature sensor, data and the signal of traffic protection device and pressure sensor calculate automatically, control unlatching or the shutdown of refrigeration compressor, the rotating speed of Control Shaft flow fan machine governor step-less adjustment axial flow blower buncher and condensation heat radiation air quantity, control the unlatching of bypass solenoid valve and liquid pipe magnetic valve or close, regulate Inlet and outlet water temperature and setting value to match, protection unit is the reliability of refrigerating operaton at low temperatures.
Further, the refrigeration system condensing pressure numerical value detecting according to pressure sensor, axial flow blower rotating speed is according to the condensing pressure of the force value step-less adjustment refrigeration system of pressure sensor, when environment temperature reduces, the rotating speed of stepless reduction axial flow blower, when environment temperature rises, the rotating speed of stepless lift shaft flow fan, to control the pressure at expulsion of refrigeration system higher than secure setting, make pressure at expulsion in compressor safe range, guarantee that refrigeration compressor can guarantee high-low pressure pressure reduction at low temperatures, normal safe operation.
Further, under low temperature environment, do not reach the secure setting of condensation pressure regulation valve at condensing pressure before, condensation pressure regulation valve is blocked the cold-producing medium of coming from condenser before condensation pressure regulation valve, most of cold-producing medium is accumulated in condenser, occupy the heat exchange area of condenser, progressively improve the condensing pressure of cold-producing medium, until condensing pressure is while reaching secure setting, open condensation pressure regulation valve and pass through by cold-producing medium, control the condensing pressure of refrigeration system higher than secure setting.Thereby control the condensing pressure of refrigeration system higher than secure setting, make condensing pressure in compressor safe range, guarantee that refrigeration compressor can guarantee high-low pressure pressure reduction at low temperatures, normal safe operation.
Further, due to when just starting refrigeration system, condensing pressure does not reach the secure setting of condensation pressure regulation valve, cannot open condensation pressure regulation valve passes through by cold-producing medium, therefore, when starting, easily there is cold-producing medium cutout, cannot set up circulation and occur warning problem, therefore when compressor start, described liquid pipe magnetic valve and bypass solenoid valve and its are opened simultaneously, height pressure reduction is set up and promoted to ON cycle also gradually, until condensing pressure is while reaching the secure setting of condensation pressure regulation valve, close described bypass solenoid valve, then open condensation pressure regulation valve and pass through cold-producing medium, and normal circulation operation.
Wherein, the opening and closing employing time of described bypass solenoid valve is set or controls according to condensing pressure.
In running; when condensing pressure is lower; condensation pressure regulation valve opening is less or close in situation; only have a small amount of or do not have cold-producing medium to pass through condensation pressure regulation valve; now; the pressure reduction of the front and back of hot gas bypass valve increases; when pressure reduction increases to hot gas bypass valve setting pressure difference; the hot gas of exhaust enters reservoir from hot gas bypass valve; for supplementing the circulation of refrigeration system; prevent that refrigeration system from occurring low-voltage variation problem because cold-producing medium stops, guarantee refrigeration system normally operation in low temperature environment situation.
Compared with prior art, beneficial effect of the present invention is as follows:
The present invention is reasonable in design, control is intelligent; broad in low temperature environment accommodation; minimum operation environment temperature is low reaches-50 ℃; the comprehensive condensing pressure control technology of condensation fan stepless speed regulation is, the condensation pressure regulation method of the condensation pressure regulation technology of condensation pressure regulation valve and intelligence; guarantee the long-term normal stable operation of unit, ensure the reliability of unit.
figure of description
Fig. 1 is refrigeration of the present invention and control system schematic diagram, wherein 11, compressor; 12, non-return valve; 13, pressure switch; 14, Pressure gauge; 15, condenser; 16, pressure sensor; 17, condensation pressure regulation valve; 18, hot gas bypass valve; 19, bypass solenoid valve; 110, reservoir; 111, filter; 112, liquid pipe magnetic valve; 113, expansion valve; 114, evaporimeter; 115, pressure switch; 116, non-return valve; 117, Pressure gauge; 21, electric control box; 22, Axial-flow fan motor speed regulator; 23, inflow temperature sensor; 24, leaving water temperature sensor; 25, traffic protection device; 26, sensor data acquisition system; 27, central control system; 28, display operation system; 31, axial flow blower buncher; 32, axial flow blower; A, condensed water water inlet; B, cooling water water inlet;
Fig. 2 is the block diagram of electric control system of the present invention.
The specific embodiment
Below in conjunction with Figure of description and specific embodiment, the present invention is made further and being elaborated, but embodiment does not limit in any form the present invention.
Embodiment 1
As shown in Figure 1 and Figure 2, the present invention includes: refrigeration system, axial flow blower cooling system and for controlling the automatic control system of refrigeration system and axial flow blower cooling system.
Described refrigeration system, comprises compressor 11, non-return valve 12, pressure switch 13, Pressure gauge 14, condenser 15, pressure sensor 16, condensation pressure regulation valve 17, hot gas bypass valve 18, bypass solenoid valve 19, reservoir 110, filter 111, liquid pipe magnetic valve 112, expansion valve 113, evaporimeter 114, pressure switch 115, non-return valve 116 and Pressure gauge 117.
Described automatic control system, comprises electric control box 21, Axial-flow fan motor speed regulator 22, inflow temperature sensor 23, leaving water temperature sensor 24, traffic protection device 25, sensor data acquisition system 26, central control system 27 and display operation system 28.
Described axial flow blower cooling system, comprises axial flow blower buncher 31 and axial flow blower 32.
As shown in Figure 1, described compressor 11 is provided with blast pipe, described reservoir 110 is provided with feed tube, described condenser 15 two ends are connected with condensation pressure regulation valve 17 with compressor 11 respectively, after described condensation pressure regulation valve 17 is in parallel with bypass solenoid valve 19, be connected reservoir 110, described reservoir 110 is connected with filter 111, described filter 111 is connected with liquid pipe magnetic valve 112, described liquid pipe magnetic valve 112 is connected with expansion valve 113, described expansion valve 113 is connected with evaporimeter 114, described evaporimeter 114 connects compressor 11, described hot gas bypass valve 18 two ends connect respectively the blast pipe of compressor 11 and the feed tube of reservoir 110.
As depicted in figs. 1 and 2, Intelligent central control system 27 is according to the Inlet and outlet water Temperature Setting of display operation system 28, the inflow temperature sensor 23 gathering in actual motion by sensor data acquisition system 26, leaving water temperature sensor 24, data and the signal of traffic protection device 25 and pressure sensor 16 calculate automatically, control unlatching or the shutdown of refrigeration compressor 11, the rotating speed of Control Shaft flow fan machine governor 22 step-less adjustment axial flow blower bunchers 31 and condensation heat radiation air quantity, control the unlatching of bypass solenoid valve 19 and liquid pipe magnetic valve 112 or close, regulate Inlet and outlet water temperature and setting value to match, protection unit is the reliability of refrigerating operaton at low temperatures.
As depicted in figs. 1 and 2, the refrigeration system condensing pressure numerical value detecting according to pressure sensor 16, axial flow blower 32 rotating speeds are according to the condensing pressure of the force value step-less adjustment refrigeration system of pressure sensor 16, when environment temperature reduces, the rotating speed of stepless reduction axial flow blower, when environment temperature rises, the rotating speed of stepless lift shaft flow fan, to control the pressure at expulsion of refrigeration system higher than secure setting, make pressure at expulsion in compressor safe range, guarantee that refrigeration compressor can guarantee high-low pressure pressure reduction at low temperatures, normal safe operation.
As depicted in figs. 1 and 2, under low temperature environment, do not reach the secure setting of condensation pressure regulation valve at condensing pressure before, condensation pressure regulation valve 17 is blocked the cold-producing medium of coming from condenser 15 before condensation pressure regulation valve 17, most of cold-producing medium is accumulated in condenser, occupy the heat exchange area of condenser, progressively improve the condensing pressure of cold-producing medium, until condensing pressure is while reaching secure setting, opening condensation pressure regulation valve passes through by cold-producing medium, thereby control the condensing pressure of refrigeration system higher than secure setting, make condensing pressure in compressor safe range, guarantee that refrigeration compressor can guarantee high-low pressure pressure reduction at low temperatures, normal safe operation.
As depicted in figs. 1 and 2, due to when just starting refrigeration system, condensing pressure does not reach the secure setting of condensation pressure regulation valve, cannot open condensation pressure regulation valve passes through by cold-producing medium, therefore, when starting, easily there is cold-producing medium cutout, cannot set up circulation and occur warning problem, therefore, when compressor 11 starts, liquid pipe magnetic valve 112 is opened with bypass solenoid valve 19 and its simultaneously, guarantee in low temperature environment and just startup situation, part cold-producing medium can enter reservoir from condensator outlet smoothly, guarantee that refrigeration system bypass solenoid valve 19 in low temperature and firm unlatching situation can pass through cold-producing medium, height pressure reduction is set up and promoted to ON cycle also gradually, until condensing pressure is while reaching the secure setting of condensation pressure regulation valve, close bypass solenoid valve 19, and then smooth opening condensation pressure regulation valve passes through cold-producing medium, and normal circulation operation.Bypass solenoid valve 19 opening and closing can adopt the time to set, and also can control according to condensing pressure.
As depicted in figs. 1 and 2; in running; when condensing pressure is lower; condensation pressure regulation valve opening is less or close in situation; only have a small amount of or do not have cold-producing medium to pass through condensation pressure regulation valve; now; the pressure reduction of the front and back of hot gas bypass valve 18 increases; when pressure reduction increases to hot gas bypass valve 18 setting pressure difference; the hot gas of exhaust enters reservoir from hot gas bypass valve; for supplementing the circulation of refrigeration system, prevent that refrigeration system from occurring low-voltage variation problem because cold-producing medium stops, guarantee refrigeration system normally operation in low temperature environment situation.
Claims (9)
1. a cryogenic refrigeration type wind-cooled cold-water unit, comprise refrigeration system, axial flow blower cooling system and for controlling the automatic control system of refrigeration system and axial flow blower cooling system, described refrigeration system is provided with compressor (11), condensation pressure regulation valve (17), bypass solenoid valve (19) and liquid pipe magnetic valve (112), described axial flow blower cooling system (3) comprises axial flow blower buncher (31) and axial flow blower (32), described automatic control system comprises Intelligent central control system (27) and Axial-flow fan motor speed regulator (22), it is characterized in that, described Intelligent central control system (27) Based Intelligent Control regulates compressor (11), condensation pressure regulation valve (17), the unlatching of bypass solenoid valve (19) and liquid pipe magnetic valve (112) or close, control the condensing pressure of described Axial-flow fan motor speed regulator (22) step-less adjustment refrigeration system.
2. a kind of cryogenic refrigeration type wind-cooled cold-water unit according to claim 1, it is characterized in that, described refrigeration system also comprises condenser (15), pressure sensor (16), hot gas bypass valve (18), reservoir (110), filter (111), expansion valve (113) and evaporimeter (114), described compressor (11) is provided with blast pipe, described reservoir (110) is provided with feed tube, described condenser (15) two ends are connected with condensation pressure regulation valve (17) with compressor (11) respectively, after described condensation pressure regulation valve (17) is in parallel with bypass solenoid valve (19), be connected reservoir (110), described reservoir (110) is connected with filter (111), described filter (111) is connected with liquid pipe magnetic valve (112), described liquid pipe magnetic valve (112) is connected with expansion valve (113), described expansion valve (113) is connected with evaporimeter (114), described evaporimeter (114) connects compressor (11), described hot gas bypass valve (18) two ends connect respectively the blast pipe of compressor (11) and the feed tube of reservoir (110).
3. a kind of cryogenic refrigeration type wind-cooled cold-water unit according to claim 1, it is characterized in that, described automatic control system comprises inflow temperature sensor (23), leaving water temperature sensor (24), traffic protection device (25), sensor data acquisition system (26) and display operation system (28), described Intelligent central control system (27) is connected respectively with display operation system (28) with sensor data acquisition system (26), described sensor data acquisition system (26) and inflow temperature sensor (23), leaving water temperature sensor (24) is connected respectively with traffic protection device (25).
4. a kind of control method of cryogenic refrigeration type wind-cooled cold-water unit according to claim 3, it is characterized in that, Intelligent central control system (27) is according to the Inlet and outlet water Temperature Setting of display operation system (28), by sensor data acquisition system (26), gather the inflow temperature sensor (23) in actual motion, leaving water temperature sensor (24), data and the signal of traffic protection device (25) and pressure sensor (16) calculate automatically, control unlatching or the shutdown of refrigeration compressor (11), the rotating speed of Control Shaft flow fan machine governor (22) step-less adjustment axial flow blower buncher (31) and condensation heat radiation air quantity, control the unlatching of bypass solenoid valve (19) and liquid pipe magnetic valve (112) or close, regulate Inlet and outlet water temperature and setting value to match.
5. the control method of a kind of cryogenic refrigeration type wind-cooled cold-water unit according to claim 4, it is characterized in that, the refrigeration system condensing pressure numerical value detecting according to pressure sensor (16), axial flow blower (32) rotating speed is according to the condensing pressure of the force value step-less adjustment refrigeration system of pressure sensor (16), when environment temperature reduces, the rotating speed of stepless reduction axial flow blower, when environment temperature rises, the rotating speed of stepless lift shaft flow fan.
6. the control method of a kind of cryogenic refrigeration type wind-cooled cold-water unit according to claim 4, it is characterized in that, under low temperature environment, do not reach the secure setting of condensation pressure regulation valve (17) at condensing pressure before, the cold-producing medium blocking-up that condensation pressure regulation valve (17) will be come from condenser (15) at condensation pressure regulation valve (17) above, most of cold-producing medium is accumulated in condenser, occupy the heat exchange area of condenser, progressively improve the condensing pressure of cold-producing medium, until condensing pressure is while reaching secure setting, opening condensation pressure regulation valve (17) allows cold-producing medium pass through, control the condensing pressure of refrigeration system higher than secure setting.
7. the control method of a kind of cryogenic refrigeration type wind-cooled cold-water unit according to claim 4, it is characterized in that, when compressor (11) starts, described liquid pipe magnetic valve (112) is opened with bypass solenoid valve (19) and its simultaneously, height pressure reduction is set up and promoted to ON cycle also gradually, until condensing pressure is while reaching the secure setting of condensation pressure regulation valve, close described bypass solenoid valve (19), then open condensation pressure regulation valve by cold-producing medium, and normal circulation operation.
8. the control method of a kind of cryogenic refrigeration type wind-cooled cold-water unit according to claim 7, is characterized in that, the opening and closing employing time of described bypass solenoid valve (19) is set or controls according to condensing pressure.
9. the control method of a kind of cryogenic refrigeration type wind-cooled cold-water unit according to claim 4, it is characterized in that, when the pressure reduction of the front and back of hot gas bypass valve (18) increases to it and sets pressure difference, the hot gas that the blast pipe of compressor (11) is discharged enters reservoir from hot gas bypass valve (18).
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| CN104807139A (en) * | 2015-04-24 | 2015-07-29 | 广东美的制冷设备有限公司 | Control method of air conditioner and control device |
| CN104930597A (en) * | 2015-06-04 | 2015-09-23 | 广东美的制冷设备有限公司 | Air-conditioner device and control method applying same |
| CN105004110A (en) * | 2015-07-21 | 2015-10-28 | 三河市同飞制冷设备有限公司 | Numerical control machine tool frequency conversion temperature control system with hot steam compensation function |
| CN105674505A (en) * | 2016-03-04 | 2016-06-15 | 广东美的制冷设备有限公司 | Control method for refrigerating of air conditioner |
| CN105698424A (en) * | 2016-04-18 | 2016-06-22 | 迪邦仕冷却技术（苏州）有限公司 | Ultralow-temperature refrigeration type single-cooling split air conditioner and ultralow-temperature refrigeration method thereof |
| CN107461952A (en) * | 2017-08-02 | 2017-12-12 | 阿尔西制冷工程技术（北京）有限公司 | Low form cooling by wind and low form refrigeration unit |
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| CN104807139A (en) * | 2015-04-24 | 2015-07-29 | 广东美的制冷设备有限公司 | Control method of air conditioner and control device |
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| CN107461952A (en) * | 2017-08-02 | 2017-12-12 | 阿尔西制冷工程技术（北京）有限公司 | Low form cooling by wind and low form refrigeration unit |
| CN110030777A (en) * | 2019-03-14 | 2019-07-19 | 刘明生 | A kind of control method for realizing best condensing pressure |
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| CN110375569A (en) * | 2019-06-17 | 2019-10-25 | 清华大学 | A kind of accumulation of energy cooling system and its adjusting method |
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| CN114087747A (en) * | 2020-07-30 | 2022-02-25 | 广东美的暖通设备有限公司 | Control method and control device of air conditioning system, controller and air conditioning system |
| CN114659238A (en) * | 2022-03-11 | 2022-06-24 | 深圳市英威腾网能技术有限公司 | Air conditioning system and low-temperature starting control method thereof |
| CN114659238B (en) * | 2022-03-11 | 2024-04-02 | 深圳市英威腾网能技术有限公司 | Air conditioning system and low-temperature starting control method thereof |
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Address after: 528313 Shunde City, Foshan province Chencun town machinery and equipment Park, No. ten, No. Road, No. 8 Applicant after: GUANGDONG SHENLING AIR-CONDITIONING EQUIPMENT CO., LTD. Address before: 528313 Shunde City, Foshan province Chencun town machinery and equipment Park, No. ten, No. Road, No. 8 Applicant before: Guangdong Shenling Air Conditioning Equipment Co., Ltd. |
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Application publication date: 20140212 |