CN107806715A - Water chiller and its throttling regulation and control method - Google Patents
Water chiller and its throttling regulation and control method Download PDFInfo
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- CN107806715A CN107806715A CN201711016538.1A CN201711016538A CN107806715A CN 107806715 A CN107806715 A CN 107806715A CN 201711016538 A CN201711016538 A CN 201711016538A CN 107806715 A CN107806715 A CN 107806715A
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- compressor
- liquid pipe
- evaporator
- water chiller
- liquid
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 117
- 239000003507 refrigerant Substances 0.000 claims abstract description 54
- 238000001704 evaporation Methods 0.000 claims abstract description 39
- 230000008020 evaporation Effects 0.000 claims abstract description 39
- 230000006835 compression Effects 0.000 claims abstract description 22
- 238000007906 compression Methods 0.000 claims abstract description 22
- 238000005057 refrigeration Methods 0.000 claims abstract description 20
- 230000000052 comparative effect Effects 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 9
- 230000001502 supplementing effect Effects 0.000 claims description 8
- 210000003205 muscle Anatomy 0.000 claims 1
- 239000002826 coolant Substances 0.000 description 19
- 238000001816 cooling Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 4
- 238000004781 supercooling Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 240000002853 Nelumbo nucifera Species 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
-
- 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
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
-
- 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
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/06—Damage
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/13—Vibrations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides a kind of water chiller and its throttling regulation and control method, the water chiller to include：Compressor, condenser, a nuclear one-stage throttling device, flash evaporation, two-step throttle device and evaporator；Wherein, the flash evaporation has entrance, gaseous state outlet and liquid outlet, and the liquid pipe that can be exchanged heat with gaseous refrigerant is provided with the evaporator；The liquid pipe has arrival end and the port of export；The compressor, condenser, a nuclear one-stage throttling device are connected to the entrance of the flash evaporation by pipeline；The liquid outlet of the flash evaporation is connected by pipeline with the arrival end of the liquid pipe simultaneously, and the port of export of the liquid pipe is sequentially communicated by pipeline and the two-step throttle device, evaporator, compressor, forms two-stage compression kind of refrigeration cycle.Water chiller provided by the invention and its throttling regulation and control method can be effectively improved compressor air suction band liquid situation, improve load performance.
Description
Technical field
The present invention relates to refrigeration technology field, in particular to a kind of water chiller and its throttling regulation and control method.
Background technology
The description of this part only provides the background information related to disclosure, without forming prior art.
For the large-size water-cooling handpiece Water Chilling Units using two-stage compression refrigeration circulation, usually using flooded evaporator, its is normal
Refrigeration work flow is as shown in Figure 1：The HTHP refrigerant come out from the exhaust outlet of compressor 10, puts into condenser 20
After thermal coagulation, flowed out from condenser 20 and after a nuclear one-stage throttling device 30 reduces pressure, herein will throttling into flash evaporation 40
The gaseous coolant of shwoot separates from liquid refrigerants, and gaseous coolant enters the gas supplementing opening of compressor 10, with the refrigerant after one stage of compression
Mix it is latter with two-stage compression is entered, liquid refrigerants flows out from flash evaporation 40 and after the reduction pressure of two-step throttle device 50,
Into evaporator 60, evaporate after absorption refrigerating hydro-thermal amount, then be compressed from the top gas outlet of evaporator 60 into compressor 10.
Refrigeration cyclic graph corresponding to the workflow as shown in Figure 2, wherein, from flash evaporation 40 separation after liquid refrigerants, reach full
After state (7 state point in figure), enter evaporator 60 through the throttling of two-step throttle device 50, after heat absorption evaporation, go out from evaporator 60
The gaseous refrigerant of gas port, generally all in the slightly state with liquid (1 state point in figure).It is well known that the hydraulic pressure of compressor 10
Power consumption, particularly centrifugal refigerating compressor can be increased during contracting, hydraulic compression easily punches the blade of impeller, directly damages compressor
Key components and parts, reduce compressor operating reliability, shorten its service life.
To mitigate above-mentioned band liquid phenomenon, as shown in figure 3, the heat exchanger tube top in the cylinder 61 of general flooded evaporator 60
Vapour-liquid screen pack is arranged, while one piece of metal plate gas block panel 63 is welded in the position close to gas outlet 62 at the top of screen pack again, makes stream
Stop again by gas block panel 63 by the gaseous coolant of filter screen, further separate the droplet of gas interior.This gear
Gas plate 63 causes larger flow resistance, reduces the pressure of inspiration(Pi) of compressor 10.In the situation that the design head of compressor 10 determines
Under, maximum pressure that the exhaust outlet of compressor 10 can reach reduces, and this influence for centrifugal refrigerating system is particularly evident：When
When condensing pressure is higher than compressor delivery pressure, the surge of compressor can be caused.Surge can cause compressor noise to increase, vibration
Aggravation, shorten the service life of compressor.If effectively surge is slowed down, then usually require to increase cooling water flow or cooling tower energy
Power, increase the grid electricity fee cost in user's initial cost and running.
In addition, the throttling arrangement generally use fixed orifice plate of traditional large-scale handpiece Water Chilling Units, although it has simple in construction, nothing
The advantages that moving component, but its unadjustable property limits performance of the handpiece Water Chilling Units in partial load condition, is unfavorable for unit
Energy-saving run.
Summary problem, the present invention propose a kind of adjustable throttling scheme, can at least overcome one kind of the prior art
Defect, avoid compressor air suction with liquid, improve the part load performance of unit.
The content of the invention
The present invention is intended to provide a kind of water chiller and its throttling regulation and control method, can at least overcome of the prior art one
Kind defect, compressor air suction band liquid situation is effectively improved, improves load performance.
The invention provides a kind of water chiller, including：Compressor, condenser, a nuclear one-stage throttling device, flash evaporation, two level
Throttling arrangement and evaporator；Wherein, the flash evaporation has entrance, gaseous state outlet and liquid outlet, is set in the evaporator
There is the liquid pipe that can be exchanged heat with gaseous refrigerant；The liquid pipe has arrival end and the port of export；
The compressor, condenser, a nuclear one-stage throttling device are connected to the entrance of the flash evaporation by pipeline；It is simultaneously described
The liquid outlet of flash evaporation is connected by pipeline with the arrival end of the liquid pipe, the port of export of the liquid pipe by pipeline with it is described
Two-step throttle device, evaporator, compressor are sequentially communicated, and form two-stage compression kind of refrigeration cycle.
Further, the compressor has air entry, exhaust outlet and gas supplementing opening；The gaseous state outlet of the flash evaporation passes through
Pipeline is connected with the gas supplementing opening of the compressor, and is formed with the compressor, condenser, a nuclear one-stage throttling device by pipeline
One stage of compression kind of refrigeration cycle.
Further, the two-step throttle device is the adjustable throttling arrangement of aperture, and the water chiller also includes：
It is arranged on the compressor air suction mouth or the compressor air suction mouth is managed between the gas outlet of the evaporator
Temperature detection part in road；
The controller being electrically connected with the two-step throttle device, temperature detection part.
Further, a nuclear one-stage throttling device is the adjustable throttling arrangement of aperture, and a nuclear one-stage throttling device and institute
State controller electric connection.
Further, the form of a nuclear one-stage throttling device or two-step throttle device include it is following in any one：Electricity
Sub- expansion valve or adjustable orifice plate.
Further, it is stored with suction superheat setting valve in the controller；
The controller receives the temperature detection part by the suction temperature signal of acquisition, and can will be based on the air-breathing temperature
The current suction superheat of signal determination is spent compared with the suction superheat setting valve of the storage, according to described relatively more single
The comparative result of member sends corresponding aperture regulation signal to the two-step throttle device.
Further, the evaporator has cylinder, and relative refrigerant inlet and gas outlet are provided with the cylinder；
The liquid pipe is located at the inside of the cylinder and corresponding above-mentioned gas outlet and set.
Further, the liquid pipe has at least one kink, and the liquid pipe is by the kink to increase liquid
Flow distance of the refrigerant in the liquid pipe.
Further, the number of the liquid pipe is multiple multiple liquid pipes arranged in parallel, and with string spaced a predetermined distance
The mode of connection is connected.
Further, the inside of the cylinder and positioned at the gas outlet lower section at be provided with screen pack, the liquid pipe
Between the screen pack and the gas outlet, and along the plane arranged in parallel parallel to the screen pack.
A kind of throttling regulation and control method of water chiller, including：
Obtain the currency of the compressor air suction degree of superheat；
By the suction superheat currency compared with default suction superheat setting valve, comparative result is obtained；
According to the comparative result, adjusting refrigerant flow rate.
Further, the currency for obtaining the compressor air suction degree of superheat includes：
The suction temperature of the compressor air suction mouth is obtained, the compressor air suction overheat is determined based on the suction temperature
The currency of degree.
Further, it is described to be included according to the comparative result, adjusting refrigerant flow rate：
When the currency of the suction superheat is more than or equal to the suction superheat setting valve, reduce the two level section
Flow the aperture of device；
When the currency of the suction superheat is less than zero, increase the aperture of the two-step throttle device；
When the currency of the suction superheat is more than zero and is less than the suction superheat setting valve, current institute is maintained
State the aperture of two-step throttle device.
The invention provides a kind of water chiller and its throttling regulation and control method, by the way that the evaporator of general refrigerating cycle is gone out
Mouthful gas block panel is changed to internal liquid pipe, refrigerant liquid before two-step throttle is first passed through the liquid pipe at the top of evaporator, after evaporation
Supercooling is formed after gaseous coolant heat exchange, then after the throttling of two-step throttle device, participates in exchanging heat into evaporator；And gaseous coolant
Absorb after the heat of the refrigerant of liquid pipe, improve mass dryness fraction, even up to slight superheat state, avoid compressor hydraulic compression, carry
Its reliability is risen, is increased the service life.In addition, coordinating the regulation of throttling arrangement aperture, the part that can improve handpiece Water Chilling Units is born
Lotus operational energy efficiency, play the partial load condition energy saving of handpiece Water Chilling Units.
Brief description of the drawings
The accompanying drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply mode and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the workflow diagram of traditional two-stage compression refrigeration circulation；
Fig. 2 is the theoretical circulation figure of traditional two-stage compression refrigeration circulation；
Fig. 3 is the evaporator internal structure sketch of traditional two-stage compression refrigeration circulation；
Fig. 4 is a kind of workflow diagram of two-stage compression refrigeration circulation provided in the application embodiment；
Fig. 5 is a kind of theoretical circulation figure of two-stage compression refrigeration circulation provided in the application embodiment；
Fig. 6 is a kind of evaporator internal structure sketch of two-stage compression refrigeration circulation provided in the application embodiment.
Description of reference numerals：
10 be compressor, and 20 be condenser, and 30 be a nuclear one-stage throttling device, and 40 be flash evaporation, and 50 be two-step throttle device, 60
It is the cylinder of conventional evaporator for conventional evaporator, 61,62 be the gas outlet of conventional evaporator, and 63 be inside conventional evaporator
Gas block panel, 70 be the application evaporator, and 71 be the cylinder of the application evaporator, and 72 be the application evaporator gas outlet, and 73 be this
Apply for the liquid pipe inside evaporator.
Embodiment
With reference to the description of accompanying drawing and the specific embodiment of the invention, details of the invention can be clearly understood.But
It is the embodiment of invention described herein, is only used for explaining the purpose of the present invention, and can not understands in any way
Into being limitation of the present invention.Under the teachings of the present invention, technical staff is contemplated that any possible change based on the present invention
Shape, these are regarded as belonging to the scope of the present invention.
It should be noted that when element is referred to as " being arranged at " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term " installation ", " connected ", " connection " should be interpreted broadly, example
Such as, it can be mechanical connection or electrical connection or the connection of two element internals, can be joined directly together, can also lead to
Cross intermediary to be indirectly connected, for the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning.Below with reference to the accompanying drawings and embodiment is combined to describe the present invention in detail.
The application can be effectively improved compressor embodiments, provides a kind of water chiller and its throttling regulation and control method
Absorbing gas belt liquid situation, while improve load performance.
Specifically, referring to Fig. 4 to Fig. 6, a kind of water chiller is proposed in one embodiment of the application.The water chiller
Including：Compressor 10, condenser 20, a nuclear one-stage throttling device 30, flash evaporation 40, two-step throttle device 50 and evaporator 70.Wherein,
The flash evaporation 40 has entrance, gaseous state outlet and liquid outlet.Being provided with the evaporator 70 can change with gaseous refrigerant
The liquid pipe 73 of heat；The liquid pipe 73 has arrival end and the port of export.The compressor 10, condenser 20, a nuclear one-stage throttling device 30
The entrance of the flash evaporation 40 is connected to by pipeline；The liquid outlet of the flash evaporation 40 passes through pipeline and the liquid pipe simultaneously
73 arrival end connection, the port of export of the liquid pipe 73 pass through pipeline and the two-step throttle device 50, evaporator 70, compressor
10 are sequentially communicated, and form two-stage compression kind of refrigeration cycle.
Handpiece Water Chilling Units described herein can be water-cooled cooling water machine group, its mainly using evaporator 70 make water with it is cold
Matchmaker's (refrigerant) carries out heat exchange, after refrigerant absorbs the thermic load in water, water cooling is produced cold water.
The evaporator 70, which has, is used to accommodating the shell of refrigerant, and the shell can be in hollow cylinder 71, the cylinder
71 can be generally cylindrical, and it has central axis.Certainly, the shell shape of the evaporator 70 can be with other shapes, this
Specific limit is not made in application herein.The evaporator 70 can be it is vertical can also be horizontal, wherein, the application is with horizontal
Exemplified by evaporator 70, its center axis direction extends along horizontal direction.Along the vertical side perpendicular to the central axis
Upwards, refrigerant inlet for flowing into refrigerant is provided with the cylinder 71 of the evaporator 70 and for flowing out gaseous refrigerant
The gas outlet 72 of evaporator 70.Wherein, the refrigerant inlet is connected with the outlet of two-step throttle device 50, the evaporator
70 gas outlet 72 is connected with the air entry of compressor 10.
Evaporator 70 can be flooded evaporator 70.When the flooded evaporator 70 works, water flows from the termination of shell one
Enter and flowed out again from the end by restraining backhaul, i.e., water is in Bottomhole pressure.Low-pressure, liquid refrigerant is then from the lower half of shell
The entrance of evaporator 70 enter, full of tube bank outside space, constantly from water absorb heat and evaporate, refrigerant vaporize while
Form a large amount of bubbles.In order to avoid unboiled refrigerant is carried over evaporator 70, general filling amount is slightly over the cylinder of half
Footpath.Flow out, enter back into compressor 10 as gas outlet 72 of the gaseous low pressure refrigerant through the top of cylinder 71 after heat absorption.
Evaporator 70 provided herein, specifically, more than refrigerant liquid level, positioned at the inside of the cylinder 71 and
The above-mentioned position of gas outlet 72 is corresponded to, i.e., is provided with the stream where the gaseous refrigerant evaporated in described evaporator 70 described
The liquid pipe 73 that can be exchanged heat with gaseous refrigerant.The liquid pipe 73, which has, is used for arrival end and the port of export, for circulating from the shwoot
The liquid refrigerant of the liquid outlet outflow of device 40.Wherein, the liquid of the arrival end of the liquid pipe 73 and the flash evaporation 40 goes out
Mouth is connected, and the port of export of the liquid pipe 73 is connected with the entrance of the two-step throttle device 50.
The flooded evaporator 70 of general refrigerating cycle is exported gas block panel and is changed to internal liquid pipe 73 by the present invention, makes two level
Refrigerant liquid first passes through the liquid pipe 73 at the top of evaporator 70 before throttling, is subcooled with being formed after the gaseous coolant heat exchange after evaporation, then
After the throttling of two-step throttle device 50, participate in exchanging heat into evaporator 70；And gaseous coolant absorbs the refrigerant through liquid pipe 73
After heat, mass dryness fraction (even up to slight superheat state) is improved, avoids the hydraulic compression of compressor 10.
In one embodiment, the liquid pipe 73 has at least one kink, and the liquid pipe 73 passes through the bending
Portion is to increase flow distance of the liquid refrigerant in the liquid pipe 73.After the liquid pipe 73 has bending part, from flash evaporation
The liquid refrigerants of 40 outflows class S types can move in the liquid pipe 73, extend flow distance increase liquid refrigerants and evaporator
The heat exchange area of the gaseous coolant evaporated in 70 cylinders 71, preferably ensure that gaseous coolant can fully absorb refrigerant in liquid pipe 73
Heat.
Specifically, the number of the liquid pipe 73 can generally have the bending body of at least one kink.In addition, institute
The number for stating liquid pipe 73 can also be multiple, can be by curved between two neighboring liquid pipe 73 when the liquid pipe 73 is multiple
Head is connected, and is connected in series.
When the liquid pipe 73 number for it is multiple when, multiple liquid pipes 73 can arranged in parallel spaced a predetermined distance.Tool
Body, the distance being spaced between two neighboring liquid pipe 73 is used for the gaseous coolant that circulates, so that the whole structure of liquid pipe 73 will not
Flow resistance generation to gaseous coolant significantly affects, and also would not substantially reduce the pressure of inspiration(Pi) of compressor 10.Certainly, liquid is worked as
When the number of pipe 73 is one, in the case of multiple pipeline sections in the liquid pipe 73 between bending are equivalent to the multiple liquid pipe 73
Single liquid pipe 73, it can realize that the flow resistance of gaseous coolant will not be produced and significantly affect, and also would not substantially reduce pressure
The effect that the pressure of inspiration(Pi) of contracting machine 10 reaches.
Further, screen pack is provided with the lower section of the gas outlet 72 in the cylinder 71 of evaporator 70, it is described
Screen pack is vapour-liquid screen pack, for separating the liquid carried in the gaseous refrigerant evaporated.The screen pack is located at liquid
The liquid level above position of refrigerant.The liquid pipe 73 between the screen pack and the gas outlet 72, and along parallel to
The plane arranged in parallel of the screen pack, it is evenly distributed on the stream where gaseous refrigerant.Separated when by the screen pack
It when gaseous refrigerant afterwards flows through the liquid pipe 73, can sufficiently uniformly be exchanged heat with liquid pipe 73, absorb liquid in liquid pipe 73
The heat of refrigerant.
Water chiller provided herein is large-size water-cooling handpiece Water Chilling Units, and flash evaporation 40 is provided with its refrigeration system,
To ensure that liquid refrigerant is stable before throttling, and there are enough degree of supercoolings, heat exchange efficiency is improved.In the present embodiment, the pressure
Contracting machine 10 has air entry, exhaust outlet and gas supplementing opening.The flash evaporation 40 has entrance, gaseous state outlet and liquid outlet.Wherein
The entrance of the flash evaporation 40 is connected with the outlet of a nuclear one-stage throttling device 30.The gaseous state outlet is arranged on the top of flash evaporation 40
Portion, it is connected with the gas supplementing opening of compressor 10.The liquid outlet is arranged on the bottom of flash evaporation 40, participates in second throttle.
In the present embodiment, large-size water-cooling handpiece Water Chilling Units are the large-size water-cooling cooling-water machine circulated using two-stage compression refrigeration
Group.Wherein, the gaseous state outlet of the flash evaporation 40 is connected by pipeline with the gas supplementing opening of the compressor 10.The compressor
10th, condenser 20, a nuclear one-stage throttling device 30, flash evaporation 40 form one stage of compression kind of refrigeration cycle by pipeline.
In the present embodiment, a nuclear one-stage throttling device 30 can be the fixed orifice plate of unadjustable aperture, can also
For can be with the adjustable throttling arrangement of aperture.When a nuclear one-stage throttling device 30 throttling arrangement adjustable for aperture, its specific shape
Formula can be any one in electric expansion valve or adjustable orifice plate, and certainly, a nuclear one-stage throttling device 30 can also be it
The form of the adjustable throttling arrangement of his aperture, specifically, the application does not make specific limit herein.Filled when the one-level throttles
When putting 30 throttling arrangement adjustable for aperture, a nuclear one-stage throttling device 30 is electrically connected with the controller, and it can basis
The control signal that the controller is sent, adjust aperture.
In the present embodiment, the compressor 10, condenser 20, a nuclear one-stage throttling device 30 are connected to described by pipeline
The entrance of flash evaporation 40；The liquid outlet of the flash evaporation 40 passes through pipeline and the arrival end of the liquid pipe 73 of evaporator 70 simultaneously
Connection, the port of export of the liquid pipe 73 of evaporator 70 pass through pipeline and the two-step throttle device 50, evaporator 70, compressor 10
It is sequentially communicated, forms two-stage compression kind of refrigeration cycle.
In the present embodiment, when two-step throttle device 50 can be aperture adjustable throttling arrangement, its concrete form can
Think any one in electric expansion valve or adjustable orifice plate, certainly, the two-step throttle device 50 can also be opened for other
The form of adjustable throttling arrangement is spent, specifically, the application does not make specific limit herein.
In one embodiment, in order to control the adjustable throttling arrangement of aperture, the water chiller can also include：If
Put in the air entry of compressor 10 or the air entry of the compressor 10 to pipeline between the gas outlet 72 of the evaporator 70
In temperature detection part；The controller being electrically connected with the two-step throttle device 50, temperature detection part.
Specifically, suction superheat setting valve is stored with the controller.The controller receives the temperature detection
Part can deposit the current suction superheat determined based on the suction temperature signal the suction temperature signal of acquisition with described
The suction superheat setting valve of storage is compared, and is sent out according to the comparative result of the comparing unit to the two-step throttle device 50
Send corresponding aperture regulation signal.
The application is directed to the water chiller provided in above-mentioned embodiment and additionally provides a kind of corresponding throttling regulation and control
Method, this method may include steps of：
Step S10：Obtain the currency of the suction superheat of compressor 10；
Step S12：By the suction superheat currency compared with default suction superheat setting valve, knot is compared in acquisition
Fruit；
Step S14：According to the comparative result, adjusting refrigerant flow rate.
Wherein, the currency for obtaining the suction superheat of compressor 10 includes：Obtain the air entry of compressor 10
Suction temperature, the currency of the suction superheat of compressor 10 is determined based on the suction temperature.Pass through the compressor 10
The suction temperature of air entry, can currency that is more accurate and easily determining suction superheat.
Wherein, according to the comparative result, by adjusting the aperture of two-step throttle device 50, adjusting refrigerant flow rate specifically may be used
With including following three kinds of situations：When the currency of the suction superheat is more than or equal to the suction superheat setting valve, subtract
The aperture of the small two-step throttle device 50；When the currency of the suction superheat is less than zero, increase the two-step throttle
The aperture of device 50；When the currency of the suction superheat is more than zero and is less than the suction superheat setting valve, maintain
The aperture of presently described two-step throttle device 50.
In the present embodiment, can also be by obtaining the evaporator 70 into the air entry pipeline of compressor 10
Gas flow, the currency or variation tendency of suction superheat are determined based on the gas flow.Certainly, it is determined that current air-breathing
The currency or variation tendency of the degree of superheat are not limited to the example above, can also determine by other means, and the application is herein
Specific limit is not made.
In addition, in order to realize more precise control, a nuclear one-stage throttling device 30, two-step throttle device 50 can be out
Adjustable throttling arrangement is spent, the joint to be throttled by two-stage is adjusted, and realizes the optimal tune of suction superheat and part load performance
Section, improve the reliability and energy saving of unit.
, can be in the air-breathing of compressor 10 in order to control the adjustable throttling arrangement of aperture under a specific application scenarios
Mouth installation suction temperature temperature-sensitive bag, it is T to set suction superheat setting valve0(T00 DEG C of ＞), as suction superheat Δ TInhale≥T0When,
Judge that the 72 gaseous coolant degrees of superheat of evaporator 70 gas outlet are bigger than normal, further relate to now gaseous coolant from the top liquid pipe of evaporator 70
73 heats absorbed are excessive, add the wasted work of compressor 10, it is necessary to adjust two-step throttle device 50, subtract the flow of liquid pipe 73
It is small, so as to reduce Δ TInhale.As Δ TInhaleAt≤0 DEG C, judge that the gaseous coolant of 70 gas outlet of evaporator 72 without the degree of superheat, illustrates now to press
The absorbing gas belt liquid of contracting machine 10, will have a strong impact on the safe operation of compressor 10, now then adjusts two-step throttle device 50, makes liquid pipe 73
Increased flow capacity, improve Δ TInhale.As 0 DEG C of ＜ Δs TInhale＜ T0When, illustrate that now suction superheat is in OK range, without adjusting liquid
The flow of pipe 73, two-step throttle device 50 keep current aperture.
In addition, from the perspective of Load Regulation, when handpiece Water Chilling Units, which unload, to be run, the refrigerant evaporation amount in evaporator 70
Reduce, gaseous coolant amount is reduced, Δ TInhaleIt will increase, as Δ TInhaleIncrease to and be more than or equal to T0When, controller will adjust two level section
The aperture of device 50 is flowed, reduces the flow of liquid pipe 73 of two-step throttle；Conversely, when handpiece Water Chilling Units load operating, in evaporator 70
Refrigerant evaporation amount increase, gaseous coolant amount increase, Δ TInhaleIt will reduce, as Δ TInhaleWhen being reduced to less than or equal to 0 DEG C, controller
The aperture of two-step throttle device 50 will be adjusted, makes the flow of liquid pipe 73 of two-step throttle increase.
Above-mentioned two situations are that the advantage of the present invention is analyzed in terms of the suction superheat of compressor 10, change an angle, from
From the point of view of the aspect of liquid pipe 73 of two-step throttle, as shown in figure 5, the liquid refrigerants after the separation of flash evaporation 40 is saturated mode, steaming is flowed through
Hair device 70 adds degree of supercooling behind top, after two-step throttle device 50, reduces gas shwoot, while add unit matter
The refrigerating capacity of refrigerant is measured, under the conditions of the wasted work of identical compressor 10, improves the coefficient of performance of handpiece Water Chilling Units.
Analysis is understood above, from the point of view of adjusting suction superheat and adjusting two angles of load, adjusts the side of throttling arrangement
Formula and result are consistent with each other, and therefore, handpiece Water Chilling Units provided herein can adjust suction superheat simultaneously and part is negative
The performance of lotus operating mode.
The water chiller and its throttling regulation and control method that the application provides, by the way that the evaporator 70 of general refrigerating cycle is exported
Gas block panel is changed to internal liquid pipe 73, refrigerant liquid before two-step throttle is first passed through the liquid pipe 73 at the top of evaporator 70, with evaporation
Supercooling is formed after gaseous coolant heat exchange afterwards, then after the throttling of two-step throttle device 50, participates in exchanging heat into evaporator 70；And
Gaseous coolant is absorbed after the heat of the refrigerant of liquid pipe 73, is improved mass dryness fraction, even up to slight superheat state, is avoided compressor
10 hydraulic compressions, its reliability is lifted, is increased the service life.In addition, coordinating the regulation of throttling arrangement aperture, cooling-water machine can be improved
The operation at part load efficiency of group, play the partial load condition energy saving of handpiece Water Chilling Units.
Above-mentioned each embodiment in this specification is described by the way of progressive, identical between each embodiment
Similar portion is cross-referenced, and what each embodiment stressed is and other embodiment difference.
The preferred embodiment of the present invention is the foregoing is only, is not intended to limit the invention, for this area
For technical staff, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made is any
Modification, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (13)
- A kind of 1. water chiller, it is characterised in that including：Compressor (10), condenser (20), a nuclear one-stage throttling device (30), sudden strain of a muscle Send out device (40), two-step throttle device (50) and evaporator (70)；Wherein, the flash evaporation (40) have entrance, gaseous state outlet and Liquid outlet, the evaporator (70) is interior to be provided with the liquid pipe (73) that can be exchanged heat with gaseous refrigerant；The liquid pipe (73) has Arrival end and the port of export；The compressor (10), condenser (20), a nuclear one-stage throttling device (30) are connected to the flash evaporation (40) by pipeline Entrance；The liquid outlet of the flash evaporation (40) is connected by pipeline with the arrival end of the liquid pipe (73) simultaneously, the liquid pipe (73) the port of export is sequentially communicated by pipeline and the two-step throttle device (50), evaporator (70), compressor (10), is formed Two-stage compression kind of refrigeration cycle.
- 2. water chiller according to claim 1, it is characterised in that the compressor (10) has air entry, exhaust outlet And gas supplementing opening；The gaseous state outlet of the flash evaporation (40) is connected by pipeline with the gas supplementing opening of the compressor (10), and with The compressor (10), condenser (20), a nuclear one-stage throttling device (30) form one stage of compression kind of refrigeration cycle by pipeline.
- 3. water chiller according to claim 2, it is characterised in that the two-step throttle device (50) is that aperture is adjustable Throttling arrangement, the water chiller also include：The compressor (10) air entry or the compressor (10) air entry are arranged on to the outlet of the evaporator (70) Temperature detection part between mouth (72) in pipeline；The controller being electrically connected with the two-step throttle device (50), temperature detection part.
- 4. water chiller according to claim 3 a, it is characterised in that nuclear one-stage throttling device (30) is that aperture is adjustable Throttling arrangement, and a nuclear one-stage throttling device (30) is electrically connected with the controller.
- 5. water chiller according to claim 4 a, it is characterised in that nuclear one-stage throttling device (30) or two-step throttle dress Put (50) form include it is following in any one：Electric expansion valve or adjustable orifice plate.
- 6. water chiller according to claim 3, it is characterised in that be stored with suction superheat in the controller and adjust Value；The controller receives the temperature detection part by the suction temperature signal of acquisition, and can will be based on the suction temperature and believe Number determine current suction superheat compared with the suction superheat setting valve of the storage, according to the comparing unit Comparative result sends corresponding aperture regulation signal to the two-step throttle device (50).
- 7. water chiller according to claim 1, it is characterised in that the evaporator (70) has cylinder (71), described Relative refrigerant inlet and gas outlet (72) are provided with cylinder (71)；The liquid pipe (73) is located at the interior of the cylinder (71) Portion and corresponding above-mentioned gas outlet (72) setting.
- 8. water chiller according to claim 7, it is characterised in that the liquid pipe (73) has at least one kink, The liquid pipe (73) is by the kink to increase flow distance of the liquid refrigerant in the liquid pipe (73).
- 9. water chiller according to claim 8, it is characterised in that the number of the liquid pipe (73) is multiple, Duo Gesuo State liquid pipe (73) arranged in parallel, and being connected in series spaced a predetermined distance.
- 10. water chiller according to claim 8, it is characterised in that the inside of the cylinder and be located at the gas outlet (72) screen pack is provided with lower section, the liquid pipe (73) is between the screen pack and the gas outlet (72), and edge The plane arranged in parallel parallel to the screen pack.
- 11. a kind of throttling based on any described water chiller in claim 1 to 10 regulates and controls method, it is characterised in that bag Include：Obtain the currency of compressor (10) suction superheat；By the suction superheat currency compared with default suction superheat setting valve, comparative result is obtained；According to the comparative result, adjusting refrigerant flow rate.
- 12. throttle regulation and control method according to claim 11, it is characterised in that described acquisition compressor (10) suction superheat Currency include：The suction temperature of the compressor (10) air entry is obtained, the compressor (10) air-breathing is determined based on the suction temperature The currency of the degree of superheat.
- 13. throttle regulation and control method according to claim 11, it is characterised in that described according to the comparative result, regulation system Cryogen flow includes：When the currency of the suction superheat is more than or equal to the suction superheat setting valve, reduce the two-step throttle dress Put the aperture of (50)；When the currency of the suction superheat is less than zero, increase the aperture of the two-step throttle device (50)；When the currency of the suction superheat is more than zero and is less than the suction superheat setting valve, presently described two are maintained The aperture of nuclear one-stage throttling device (50).
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| CN201711016538.1A CN107806715B (en) | 2017-10-25 | 2017-10-25 | Water cooling unit and throttling regulation and control method thereof |
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| CN201711016538.1A CN107806715B (en) | 2017-10-25 | 2017-10-25 | Water cooling unit and throttling regulation and control method thereof |
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| CN108759211A (en) * | 2018-06-12 | 2018-11-06 | 重庆美的通用制冷设备有限公司 | The second vapor injection control method of two stage centrifugal unit and two stage centrifugal unit |
| CN108870573A (en) * | 2018-07-16 | 2018-11-23 | 珠海格力电器股份有限公司 | Refrigeration unit dehumidification control method, device, refrigeration unit mainboard and storage medium |
| CN109114749A (en) * | 2018-07-04 | 2019-01-01 | 青岛海尔空调器有限总公司 | Control method and device for air-conditioning system |
| CN110044132A (en) * | 2019-05-15 | 2019-07-23 | 南京福加自动化科技有限公司 | A kind of propylene full-liquid type refrigeration system and control method |
| CN110553441A (en) * | 2019-09-19 | 2019-12-10 | 重庆美的通用制冷设备有限公司 | Operation control method and system, readable storage medium, compression and air conditioning system |
| CN114508877A (en) * | 2021-10-22 | 2022-05-17 | 浙江正泰能效科技有限公司 | Two-stage throttling device, control method, control device, refrigerating unit and medium |
| WO2023010768A1 (en) * | 2021-08-03 | 2023-02-09 | 青岛海信日立空调系统有限公司 | Air conditioning system |
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| CN110044132A (en) * | 2019-05-15 | 2019-07-23 | 南京福加自动化科技有限公司 | A kind of propylene full-liquid type refrigeration system and control method |
| CN110553441A (en) * | 2019-09-19 | 2019-12-10 | 重庆美的通用制冷设备有限公司 | Operation control method and system, readable storage medium, compression and air conditioning system |
| WO2023010768A1 (en) * | 2021-08-03 | 2023-02-09 | 青岛海信日立空调系统有限公司 | Air conditioning system |
| CN114508877A (en) * | 2021-10-22 | 2022-05-17 | 浙江正泰能效科技有限公司 | Two-stage throttling device, control method, control device, refrigerating unit and medium |
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Effective date of registration: 20231107 Address after: 519070, 1st Floor, Building 7, No. 789 Jinji Road, Qianshan, Zhuhai, Guangdong Province Patentee after: Zhuhai Gree Green Control Technology Co.,Ltd. Address before: 519070 No. six Jinji Road West, Zhuhai, Guangdong Patentee before: GREE ELECTRIC APPLIANCES Inc. OF ZHUHAI |
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