CN103175276A - Air-cooling direct-current frequency-conversion magnetic levitation nature cold source water chilling unit - Google Patents
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- CN103175276A CN103175276A CN2013101273247A CN201310127324A CN103175276A CN 103175276 A CN103175276 A CN 103175276A CN 2013101273247 A CN2013101273247 A CN 2013101273247A CN 201310127324 A CN201310127324 A CN 201310127324A CN 103175276 A CN103175276 A CN 103175276A
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Abstract
The invention discloses an air-cooling direct-current frequency-conversion magnetic levitation nature cold source water chilling unit. The water chilling unit comprises a magnetic levitation compressor, an air-cooling condenser, a throttle valve and an evaporator, wherein the outlet of the magnetic levitation compressor is successively connected with the air-cooling condenser, the throttle valve and the evaporator through a pipeline, and a steam outlet of the evaporator is communicated with an air suction port of the magnetic levitation compressor; the outlet of the air-cooling condenser is provided with a branch pipe communicated with a motor cooling inlet of the magnetic levitation compressor, and a nature cold source circulating water system comprises two branch pipe pipelines with valves; and the inlets of the two branch pipe pipelines are connected with a water returning pipeline, the outlets of the two branch pipe pipelines are communicated with a water inlet of the evaporator so as to form circulation, and one of the two branch pipe pipelines is provided with a heat exchange coil. The air-cooling direct-current frequency-conversion magnetic levitation nature cold source water chilling unit provided by the invention has the beneficial effects that the magnetic levitation compressor is used to avoid, a water return problem; an efficient flooded evaporator is utilized and a direct current frequency conversion technology and a nature cold source utilization technology are integrated, thus providing an omnibearing, low-cost, safe and reliable energy conservation measures for the full-year refrigeration field.
Description
Technical field
The invention belongs to the air conditioner refrigerating technology, relate in particular to refrigeration compressor and natural cooling source associating handpiece Water Chilling Units.
Background technology
Be accompanied by the policy appearance that national energy-saving reduces discharging, utilize the second low-temperature receiver and natural cooling source to become one of main energy saving means of air conditioner industry, especially air conditioner in machine room field because there is refrigeration demand the whole year in data center, is excessively utilizing the natural cooling source energy-saving effect can be more remarkable in season and winter.
The refrigeration demand of data center is generally the cooling needs from information technoloy equipment, use the data center of chilled water to carry out heat exchange by the chilled water in chilled water plant and the air in machine room, thereby realize the cooling in machine room, after water temperature raises, (generally even higher at the 12-18 degree) enters handpiece Water Chilling Units place lower the temperature (temperature is generally between 7-15).When outdoor temperature was low, machine room water (12-18 degree) out can carry out heat exchange with surrounding air directly or indirectly, thereby need not open compressor, reaches the purpose of free refrigeration, generally was referred to as natural cooling source or free low-temperature receiver.
Progress along with science and technology, information technoloy equipment can bear more and more higher temperature, therefore correspondingly the temperature of chilled water also can be used De Genggao, and in data center, can be by effective tissue of air-flow, make return air temperature higher, the rising of return air temperature also can promote chilled water, thereby improves the time of utilizing of natural cooling source.
More current natural cooling sources utilize in technology, generally concentrate on screw or vortex compression refrigerating system, because use air-cooled handpiece Water Chilling Units, more be conducive to the utilization of natural cooling source on the structure and on heat transfer mechanism, system also can be more simple, so air-cooled unit uses natural cooling source more extensive.
But, for the unit of year round cooling, because reliability requirement is higher, the oil return problem of full-liquid type unit is becoming outdoor temperature, and during the situations such as varying duty, reliability is troubling, therefore the unit of year round cooling is all generally the dry type unit, and the general Energy Efficiency Ratio of dry type unit is all not too high.And the utilization of current natural cooling source is owing to using fixed compressor frequently, and in excessive season during the natural cooling source scarce capacity, when needing to open compressor and replenishing cold, both can not cooperate well, reaches truly energy-conservation.
Present stage, centrifugal compressor easily existed surge, obstruction etc., and especially when pressure ratio is higher, so centrifugal compressor generally is rarely used in and does air-cooled product, is mainly to worry that pressure ratio is too high.The magnetic suspension centrifugal compressor belongs to a type of compression, although compressor itself has been done a lot of work about the customer service high pressure ratio, compares with screw rod, still needs the client in the situation that the high pressure ratio problem that summer, extreme minority occurred.Chinese Regional is vast, the very situation of high temperature can appear in short-term in some Area during Summer, and because on-the-spot air current composition is bad, dirty stifled etc. the factor of condenser, the application of air-cooling magnetic product suspension under this amblent air temperature condition of China also needs some technical difficult points of customer service.
Summary of the invention
Goal of the invention: for the problem and shortage of above-mentioned existing existence, the purpose of this invention is to provide a kind of wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units, use the DC frequency-changing magnetic suspension without oily centrifugal compressor, avoided the problem of oil return, and can use the high-efficiency full solution type evaporimeter, DC Frequency Conversion Technology and natural cooling source utilize technology to combine, thereby provide omnibearing conservation measures for the year round cooling such as data center field; And can provide higher water temperature, to adapt to the needs of machine room and other process equipments.
technical scheme: for achieving the above object, the technical solution used in the present invention is a kind of wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units, comprise compressor cycle refrigeration system and natural cooling source circulation, wherein: described compressor cycle refrigeration system, comprise magnetic suspension compressor, air-cooled condenser, choke valve and evaporimeter, the outlet of described magnetic suspension compressor by pipeline successively with air-cooled condenser, choke valve, evaporimeter connects, the steam (vapor) outlet of described evaporimeter is communicated with the air entry of magnetic suspension compressor again, the outlet of described air-cooled condenser is provided with branch road and is communicated with the cooling entrance of the motor of magnetic suspension compressor, described natural cooling source circulation comprises establishes valvular two bypass line, and the entrance of these two bypass line is connected with water return pipeline, thereby outlet is communicated with the formation circulation with the water inlet of evaporimeter, and wherein a bypass line is provided with heat exchange coil.
As preferably, the air-cooled condenser in described heat exchange coil and compressor cycle refrigeration system shares blower fan.
As preferably, in described natural cooling source circulation, the valve of two bypass line is triple valve or is located at respectively two control valves on bypass line.
As preferably, described control valve be magnetic valve, electrical ball valve,, gate valve or butterfly valve.
Technique scheme is further improved, and described evaporimeter is provided with liquid level gauge.
Further, the branch road of described compressor cycle refrigeration system is provided with fluid reservoir.
Further, described compressor cycle refrigeration system also is provided with economizer.
As preferably, described magnetic suspension compressor is the magnetic suspension compressor of separate unit magnetic suspension compressor or many parallel connections.
As preferably, described evaporimeter is full-liquid type shell-tube evaporator, falling film type shell-tube evaporator, dry-expansion shell and tube evaporator or plate type heat exchanger.
As preferably, described choke valve is electric expansion valve or heating power expansion valve.
Beneficial effect: compared with prior art, the present invention has the following advantages: 1, the combination of DC frequency-changing magnetic suspension compressor technology and natural cooling source technology is used; 2, compressor is used in operation reliably under the year round cooling operating mode: control by liquid level, and the motor Cooling Design, fan speed regulation is realized; 3, the energy-saving run of frequency-changeable compressor and natural cooling source coordinates: by rational circuit design, coil design, logic switching controls technology and compressor DC frequency-changing regulation technology; 4, the cooling application of the motor of magnetic suspension unit: for the protection compressor electric motor, by rational circuit design, for compressor provides the liquid refrigerant cooling motor.
Description of drawings
Fig. 1 is the structural principle schematic diagram of the described wind cooling DC frequency conversion magnetic levitation of the embodiment of the present invention 1 natural cooling source handpiece Water Chilling Units;
Fig. 2 is the structural principle schematic diagram of the described wind cooling DC frequency conversion magnetic levitation of the embodiment of the present invention 2 natural cooling source handpiece Water Chilling Units;
Fig. 3 is the structural principle schematic diagram of the described wind cooling DC frequency conversion magnetic levitation of the embodiment of the present invention 3 natural cooling source handpiece Water Chilling Units;
Fig. 4 is the structural principle schematic diagram of the described wind cooling DC frequency conversion magnetic levitation of the embodiment of the present invention 4 natural cooling source handpiece Water Chilling Units;
Fig. 5 is the structural principle schematic diagram of the described wind cooling DC frequency conversion magnetic levitation of the embodiment of the present invention 5 natural cooling source handpiece Water Chilling Units;
Fig. 6 is the first structural principle schematic diagram of the described wind cooling DC frequency conversion magnetic levitation of the embodiment of the present invention 6 natural cooling source handpiece Water Chilling Units;
Fig. 7 is the second structural principle schematic diagram of the described wind cooling DC frequency conversion magnetic levitation of the embodiment of the present invention 6 natural cooling source handpiece Water Chilling Units.
Wherein, magnetic suspension compressor 1, condenser 2, choke valve 3, evaporimeter 4, heat exchange coil 5, triple valve 6, blower fan 7, liquid level gauge 8, fluid reservoir 9, economizer 10.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
Embodiment 1
a kind of wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units, each parts annexation as shown in Figure 1, comprise two systemic circulation, be respectively compressor cycle refrigeration system and natural cooling source circulation, wherein said compressor cycle refrigeration system, comprise magnetic suspension compressor, air-cooled condenser, choke valve and evaporimeter, the outlet of described magnetic suspension compressor by pipeline successively with air-cooled condenser, choke valve, evaporimeter connects, the steam (vapor) outlet of described evaporimeter is communicated with the air entry of magnetic suspension compressor again, the outlet of described air-cooled condenser is provided with branch road and is communicated with the cooling entrance of the motor of magnetic suspension compressor, described natural cooling source circulation comprises two bypass line, thereby be provided with the flow proportional that triple valve can be controlled two bypass line between them, the entrance of these two bypass line and water return pipeline (internal circulation be the coolant carrier that absorbs after heat) are connected, thereby outlet is communicated with the formation circulation with the water inlet of evaporimeter, wherein a bypass line is provided with heat exchange coil.Wherein choke valve can be the choke valve of other modes such as electric expansion valve, heating power expansion valve or orifice plate, and evaporimeter is full-liquid type or downward film evaporator.It should be noted that the tube connector between condensator outlet and compressor is DC frequency-changing device and the motor cooling line that designs for magnetic suspension compressor specially, normally move for the protection of compressor.
Three-way switch valve can be (electronic, pneumatic and hydraulic pressure etc.) of automaticallying switch, and can be also manual.Main purpose is to realize the commutation switching.Compressor can be single compressor, perhaps the mode of 2 or multiple compressors parallel connection.Condenser and evaporimeter have been illustrated one, and in fact condenser can be one or more compositions, and evaporimeter can be also one or more.Evaporimeter can be full-liquid type shell-tube evaporator, falling film type shell-tube evaporator, dry type shell and tube evaporator or plate type heat exchanger etc.That this figure illustrates is the figure of flooded evaporator, and when evaporimeter was other types, connected mode was slightly different, still belonged in protection scope of the present invention.
Freeze cycle water after absorption heat in water return pipeline (refers to refrigerating medium in fact, as ethylene glycol, propane diols and salt solution etc.) enter into two bypass line of natural cooling source circulation, regulate flow proportional in two bypass line by triple valve, enter in evaporimeter through circulating after the heat exchange coil cooling, discharge the liquid of HTHP after the low-pressure gas that the air entry suction evaporimeter of magnetic suspension compressor is emitted, and through condenser and throttle valve control, further make its cooling be back to evaporimeter, the freeze cycle water after the delivery port of evaporimeter is lowered the temperature.Wherein heat exchange coil and condenser have unidirectional air channel near superimposed layout, and share identical blower fan carry out air-cooled, thereby can save cost; Simultaneously branch road be set in the exit of condenser and be communicated with magnetic suspension compressor, thereby can cool for magnetic suspension compressor provides, preventing the magnetic suspension compressor fault.
The air-cooling magnetic suspension natural cooling source unit that the present invention proposes has three kinds of mode of operations:
(1) pure compression machine mode of operation: when outdoor temperature is higher than return water temperature, can utilize without natural cooling source, this moment, unit was operated under the pattern of pure compression machine, provided whole refrigerating capacitys by compressor, can the sacrificial section cold under this pattern, regulating three-way valve is controlled the fraction backwater and is passed through heat exchange coil, this moment, blower fan produced windward the air channel by heat exchange coil have cooling, thereby reduce the EAT of condenser, and then reduced condensing pressure, and corresponding, because the evaporimeter inflow temperature also has to a certain degree rising, evaporating pressure also can correspondingly improve, this is the technology of a kind of reduction pressure ratio (ratio of condensing pressure and evaporating pressure), application by this technology, air-cooling magnetic can be suspended and be used in reliably under various hot environment operating modes, thereby solve magnetic suspension compressor and can not cross the defective of moving under high pressure ratio.
(2) compressor+natural cooling source coordinates operational mode: when outdoor temperature during lower than return water temperature, but outdoor temperature is enough not low, so that the cold that natural cooling source provides is not enough; At this moment, the backwater outdoor heat exchange coil pipe of first flowing through, the evaporimeter of flowing through again after warp and outdoor Cryogenic air heat exchange, replenish not enough part cold by DC frequency-changeable compressor, because DC frequency-changeable compressor is stepless load-adjusting, therefore can realize and the slitless connection of natural cooling source, the efficient characteristics of DC frequency-changeable compressor under sub-load and the utilization of free natural cooling source make the efficient of unit very high;
(3) pure natural cooling source pattern: when outdoor temperature was enough low, the cold of natural cooling source was very sufficient, and compressor need not to open, the backwater outdoor heat exchange coil pipe of first flowing through, the evaporimeter of flowing through again after warp and outdoor Cryogenic air heat exchange.Sufficient owing to cooling, compressor need not to open, and unit operation is under the pattern of making laughs very much.
The technical characterstic of magnetic suspension centrifugal compressor has determined magnetic suspension compressor and has worried so to move under low condensing pressure unlike compressors such as screw rod, vortex, pistons.We know that generally condensing pressure is lower, unit is more energy-conservation.But be reduced to certain degree in outdoor temperature, be unlikely to too low in order to guarantee pressure ratio, still need the condensation fan of air-cooled condenser is regulated, thereby make the compressor pressure ratio be controlled in the scope of producer's requirement.
Use the technology of various adjusting rotation speed of fan, all can bring the lifting of certain cost, and the grouping startup is cheapest a kind of mode.But grouping starts the mode that may have the blower fan frequent starting.
Therefore this patent adopts the mode of grouping startup+rotation speed of fan adjusting that air-cooled condensation fan is regulated, usually, preferred blower fan grouping is regulated, and guarantees that as much as possible condenser is minimum, at the node that the blower fan frequent starting may occur, adopt the mode of step-less adjustment blower fan.Both realize the energy-conservation of system, avoided again the frequent starting of condensation fan, and reduced the running time of some blower fans.
Embodiment 2
As shown in Figure 2, the difference of it and embodiment 1 is that triple valve is replaced with two valves of controlling break-makes, thereby realizes identical function, and control valve can be automatic or manual equally.Valve can be magnetic valve automatically, electrical ball valve etc., electric butterfly valve etc.; Manual on-off valve can be ball valve, gate valve, butterfly valve etc.
Embodiment 3
As shown in Figure 3, the difference of it and embodiment 1 is to have set up liquid level gauge on evaporimeter.the design put Main Function in the liquid level that reads evaporimeter inside in control system, and in conjunction with the application of electric expansion valve, by the control algolithm of optimizing, change in outdoor temperature, the unfavorable factor such as refrigerant flow variation lower time, still the liquid level in evaporimeter more accurately can be controlled at rational position, both guaranteed that heat exchanger tube all was immersed in cold-producing medium, guaranteed again more not allow under any operating mode liquid refrigerant be unlikely to pour into (this point is even more important to magnetic suspension compressor) in compressor, promoted heat exchange efficiency, also improved product annual, reliability under varying load condition, especially when having the natural cooling source technology to combine, therefore the application of natural cooling source, compressor more often can working portion under load, the changes in flow rate of cold-producing medium can be larger, therefore the fluid level controller in this patent has played very crucial effect.
Embodiment 4,
As shown in Figure 4, the difference of it and embodiment 3 is that the backflow in the compressor cycle refrigeration system enters on the branch road of magnetic suspension compressor fluid reservoir is set, thereby in the time of can guaranteeing whole year operation to the cooling confession of compressor electric motor be all liquid, thereby make the more safe and reliable operation of unit.
As shown in Figure 5, the difference of it and embodiment 4 is to have increased economizer, thereby can improve the energy saving of unit.Economizer can make various heat exchangers, such as plate type heat exchanger, shell and tube exchanger, double pipe heat exchanger etc., the plate type heat exchanger of illustrating in this example.
As shown in Figure 6, when adopting first kind of way magnetic suspension compressor in parallel that low-temperature receiver is provided, check valve is located at respectively the exhaust ports of each compressor.And Fig. 7 is the second way magnetic suspension compressor in parallel provides low-temperature receiver, and check valve also is located at the exhaust ports of each compressor as shown in the figure.
Claims (10)
1. wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units is characterized in that: comprise compressor cycle refrigeration system and natural cooling source circulation, wherein:
Described compressor cycle refrigeration system, comprise magnetic suspension compressor, air-cooled condenser, choke valve and evaporimeter, the outlet of described magnetic suspension compressor is connected with air-cooled condenser, choke valve, evaporimeter successively by pipeline, the steam (vapor) outlet of described evaporimeter is communicated with the air entry of magnetic suspension compressor again, and the outlet of described air-cooled condenser is provided with the branch road that is communicated with DC frequency-changing device and the cooling entrance of motor of magnetic suspension compressor;
Described natural cooling source circulation comprises establishes valvular two bypass line, and the entrance of these two bypass line is connected with water return pipeline, thereby outlet is communicated with the formation circulation with the water inlet of evaporimeter, and wherein a bypass line is provided with heat exchange coil.
2. wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units according to claim 1, it is characterized in that: the air-cooled condenser in described heat exchange coil and compressor cycle refrigeration system shares the blower fan group.
3. wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units according to claim 2, it is characterized in that: in described natural cooling source circulation, the valve of two bypass line is triple valve or is located at respectively two control valves on bypass line.
4. wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units according to claim 3, it is characterized in that: described control valve is magnetic valve, electrical ball valve, gate valve or butterfly valve.
5. wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units according to claim 3, it is characterized in that: described evaporimeter is provided with liquid level gauge.
6. wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units according to claim 5, it is characterized in that: the branch road of described compressor cycle refrigeration system is provided with fluid reservoir.
7. wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units according to claim 6, it is characterized in that: described compressor cycle refrigeration system also is provided with economizer.
8. wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units according to claim 7, it is characterized in that: described magnetic suspension compressor is the magnetic suspension compressor of separate unit magnetic suspension compressor or many parallel connections.
9. wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units according to claim 8, it is characterized in that: described evaporimeter is full-liquid type shell-tube evaporator, falling film type shell-tube evaporator, dry-expansion shell and tube evaporator or plate type heat exchanger.
10. wind cooling DC frequency conversion magnetic levitation natural cooling source handpiece Water Chilling Units according to claim 9, it is characterized in that: described choke valve is electric expansion valve or heating power expansion valve.
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| CN104567054A (en) * | 2014-12-26 | 2015-04-29 | 珠海格力电器股份有限公司 | Anti-surge system of centrifugal type refrigerating unit |
| CN104676995A (en) * | 2015-02-02 | 2015-06-03 | 山东新力拓节能服务工程科技有限公司 | Method for judging running states of magnetic suspension cooling water units in freezing station control systems |
| CN104896654A (en) * | 2015-02-02 | 2015-09-09 | 山东新力拓节能服务工程科技有限公司 | A control method for rapid loading of a refrigeration station unit |
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| CN105634248A (en) * | 2016-01-14 | 2016-06-01 | 天津普传控制设备有限公司 | Frequency converter suitable for high-temperature environment |
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| CN104896654B (en) * | 2015-02-02 | 2018-07-13 | 山东新力拓节能服务工程科技有限公司 | A kind of control method that refrigeration station unit quickly loads |
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| CN106322593A (en) * | 2015-07-03 | 2017-01-11 | 广州市华德工业有限公司 | Evaporative cooling type water chilling unit |
| CN105466056A (en) * | 2015-12-21 | 2016-04-06 | 重庆美的通用制冷设备有限公司 | Water chilling unit |
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Application publication date: 20130626 |