CN104214982B - A kind of precision height, the air-cooled screw compressor water chiller of low cost and control method thereof - Google Patents
A kind of precision height, the air-cooled screw compressor water chiller of low cost and control method thereof Download PDFInfo
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- CN104214982B CN104214982B CN201410386228.9A CN201410386228A CN104214982B CN 104214982 B CN104214982 B CN 104214982B CN 201410386228 A CN201410386228 A CN 201410386228A CN 104214982 B CN104214982 B CN 104214982B
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Abstract
The invention discloses a kind of precision height, the air-cooled screw compressor water chiller of low cost and control method thereof, including multiple stage condensation fan, vaporizer and multiple stage stepless adjustment screw rod compressor, multiple stage stepless adjustment screw rod compressor is respectively equipped with multiple electromagnetic valve for adjusting and controls the independent startup of stepless adjustment screw rod compressor, loads and unload.Realize the control of the independent loads between multiple stepless adjustment screw rod compressor and independent Unloading Control and first enter the control gone out afterwards, under conditions of increasing slider position sensor without stepless adjustment screw rod compressor, realizing the high-precision control of handpiece Water Chilling Units water temperature.
Description
Technical field
The present invention relates to a kind of air-cooled screw compressor water chiller, particularly relate to a kind of precision air-cooled screw high, low cost cold
The control method of water unit.
Background technology
The application places of high-precision screw handpiece Water Chilling Units is mostly constant water temperature occasion extra high to water temperature required precision:
Such as the server cooling system of data center, large hotel cold/hot water water system, electronics industry, instrument and meter, accurate machine
The places such as tool, biological engineering, food and drink, medical and health.These places are required to the freezing temperature of relative constancy, freezing temperature
Precision will directly affect the safety in these places, reliability etc..It is equally known that common screw handpiece Water Chilling Units on market
Control typically to use the mode having level to regulate to carry out, owing to grade range of accommodation that has of separate unit screw water cooling machine set is 50% ~ 100%,
And only 50%, 75%, the gear of 100% 3 capacity regulating, regulating power is limited, therefore has the screw water cooling machine set that level regulates,
Under limited helical-lobe compressor number, if quantity is less than or equal to 3, its water temperature control accuracy reaches ± 1.5 DEG C do not allowed
Yi Liao.For the helical-lobe compressor handpiece Water Chilling Units having level to regulate, if coolant controlled precision to be improved, the only way out is exactly
Increase the number of the helical-lobe compressor having level to regulate, to reduce each helical-lobe compressor having level to regulate when capacity regulating to whole
The fluctuation that body water temperature is likely to result in, but so often make the holistic cost of handpiece Water Chilling Units increase, weight increases and peace simultaneously
Dress size increases.Giving an example, a cold is the cooling by wind of 800KW, when the screw compression using certain brand
During machine, compressor cost is 79249 yuan, unit weight about 7300KG, installation dimension about 7680 × 2280 × 2600.When using two
During the helical-lobe compressor of this brand individual, compressor cost is 92014 yuan, unit weight about 8600KG, installation dimension about 11700 ×
2100×2420.When using the helical-lobe compressor of three these brands, compressor cost is 106128 yuan, and unit weight is about
9000KG, installation dimension is 10000 × 2100 × 2400.As can be seen here, there is bigger drawback in this method.Therefore, at present
On market, in order to improve the water temperature control accuracy of screw water cooling machine set, the helical-lobe compressor of employing step-less adjustment mostly, and market
On for the regulation of stepless helical-lobe compressor in the case of not increasing compressor slider position sensor, because cannot accurately judge
The actual capacity output that every compressor is current, often uses the simple control mode synchronizing to load and synchronize unloading, water temperature control
The precision of system is the most limited, usual water temperature precision can reach ± 0.8 DEG C the most all well and good.Increasing compressor slide position sensing
In the case of device, in the control accuracy of water temperature, can improve, but compressor cost will increase, and compressor delivery date
To extend, coolant controlled precision is easy to be affected by position sensor certainty of measurement and error simultaneously.At position sensor
In the case of fault, the control accuracy of water temperature loses again the condition of guarantee.Therefore, the water temperature control of screw water cooling machine set had both been improved
Precision processed ensures that again the cost of screw water cooling machine set has not increased the emphasis into present invention research.
Application No. 201320596278.0 patent name is " air-cooled screw compressor water chillers of a kind of many finned heat exchangers "
Chinese patent disclose the air-cooled screw compressor water chiller of a kind of many finned heat exchangers, it include helical-lobe compressor, electromagnetic valve III,
Electromagnetic valve II, electromagnetic valve I, blower fan III, finned heat exchanger IV, finned heat exchanger III, blower fan I, blower fan II, fin I, fin II,
Blower fan IV, check valve I, check valve II, check valve III, reservoir, device for drying and filtering, liquid-sighting glass, heating power expansion valve I, electromagnetic valve
IV, electromagnetic valve V, heating power expansion valve II, case tube heat exchanger and gas-liquid separator, this patent at condensation segment, by with screw compression
Machine each load section configures corresponding finned heat exchanger and blower fan, changes finned heat exchanger heat exchange area and air quantity；At evaporator section,
Configure corresponding heating power expansion valve and case tube heat exchanger by load section each with helical-lobe compressor, change refrigerant flow and shell
The heat exchange area of heat exchange of heat pipe, it is achieved that unit is in the accurate regulation of compressor each load section energy.This patent structure is complicated, becomes
This height.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of precision is high, the air-cooled screw of low cost is cold
The control method of water unit.
The above-mentioned purpose of the present invention is achieved by following technical solution:
A kind of precision is high, the air-cooled screw compressor water chiller of low cost, stepless including multiple stage condensation fan, vaporizer and multiple stage
Adjusting screw rod compressor, multiple stage stepless adjustment screw rod compressor is respectively equipped with multiple electromagnetic valve for adjusting, be provided with switch board respectively with
Multiple electromagnetic valve for adjustings, multiple stage stepless adjustment screw rod compressor, condensation fan and vaporizer connect, and described switch board is provided with control
Device, described controller is turned on and off independently opening of control stepless adjustment screw rod compressor by the multiple electromagnetic valve for adjustings of control
Move, load and unload.
The present invention uses the stepless adjustment screw rod compressor of conventional configuration, does not increase compressor slider position sensor, this
Point does not affect the increase of whole system cost.Only by control and regulation electromagnetic valve be turned on and off realize two step-less adjustment
The independent loads of helical-lobe compressor, unload and regulate, it is achieved the high accuracy of regulation.The above feature has all fully demonstrated this
Bright simplicity and economy.
Further, inflow temperature sensing it is respectively equipped with at total water inlet tube of described air-cooled screw compressor water chiller and at water outlet
Device and leaving water temperature sensors, described inflow temperature sensor and leaving water temperature sensors detect house steward's inflow temperature in real time with total
Pipe leaving water temperature.Described switch board is also connected with inflow temperature sensor and leaving water temperature sensors.
Preferably, described two stepless adjustment screw rod compressors are two, the respectively first stepless adjustment screw rod compressor
With the second stepless adjustment screw rod compressor；Described electromagnetic valve for adjusting is 4, the respectively first electromagnetic valve for adjusting, the second regulation electricity
Magnet valve, the 3rd electromagnetic valve for adjusting and the 4th electromagnetic valve for adjusting, described first electromagnetic valve for adjusting and the second electromagnetic valve for adjusting correspondence
The corresponding second stepless adjustment screw rod pressure of one stepless adjustment screw rod compressor, described 3rd electromagnetic valve for adjusting and the 4th electromagnetic valve for adjusting
Contracting machine.
A kind of precision is high, the control method of the air-cooled screw compressor water chiller of low cost, and described controller is according to setting and real
The controlled water temperature of house steward's inflow temperature, house steward's leaving water temperature and setting that border detects carries out automatic control and adjustment electromagnetic valve
It is turned on and off, thus controls the independent startup of stepless adjustment screw rod compressor, load and unload.
Specifically, when the controlled water temperature set enters coolant-temperature gage, the actually detected house steward arrived as house steward's leaving water temperature or house steward
Leaving water temperature or house steward enter coolant-temperature gage > house steward's leaving water temperature of setting or house steward be when entering coolant-temperature gage the+the n-th loaded value, the n-th stepless-adjustment
Joint helical-lobe compressor starts, i.e. 2n-1 electromagnetic valve for adjusting, the energising of 2n electromagnetic valve for adjusting, and the start-up course at 30S terminates
After, loading, unloading and the stable control process of the n-th stepless adjustment screw rod compressor are as follows:
(1) actually detected to house steward's leaving water temperature or house steward enter coolant-temperature gage > house steward's leaving water temperature of setting or house steward enter
During coolant-temperature gage+precision, the n-th stepless adjustment screw rod compressor loads, i.e. 2n-1 electromagnetic valve for adjusting energising, 2n regulates electromagnetism
Valve power-off；
(2) the house steward's leaving water temperature set or house steward enter coolant-temperature gage-precision≤actually detected house steward's leaving water temperature arrived or
House steward enters house steward's leaving water temperature of coolant-temperature gage≤setting or time house steward enters coolant-temperature gage+precision, and the n-th stepless adjustment screw rod compressor is steady
Constant volume runs, i.e. 2n-1 electromagnetic valve for adjusting energising, the equal no power of 2n electromagnetic valve for adjusting；
(3) actual house steward's leaving water temperature or house steward enter coolant-temperature gage, and < house steward's leaving water temperature of setting or house steward enter water temperature
During degree-precision, the n-th stepless adjustment screw rod compressor unloading runs, i.e. 2n-1 electromagnetic valve for adjusting power-off, 2n regulates electromagnetism
Valve is energized；
(4) actual house steward's leaving water temperature or house steward enter house steward's leaving water temperature of coolant-temperature gage≤setting or house steward enters water temperature
During degree the-the (n+1)th unloading value, the n-th stepless adjustment screw rod compressor is out of service；
Wherein, the (n+1)th unloading value < the n-th unloading value < fixed value < house steward's leaving water temperature of setting or house steward enter coolant-temperature gage-
Precision < house steward's leaving water temperature of setting or house steward enter coolant-temperature gage < house steward's leaving water temperature of setting or house steward enter coolant-temperature gage+precision <
N-th loaded value < the (n+1)th loaded value, n=1,2 ....
When the controlled water temperature set enters coolant-temperature gage as house steward's leaving water temperature or house steward, actually detected to house steward go out water temperature
Degree or house steward enter coolant-temperature gage > house steward's leaving water temperature of setting or house steward be when entering coolant-temperature gage the+the (n+1)th loaded value, the (n+1)th step-less adjustment
Helical-lobe compressor starts, i.e. 2n+1 electromagnetic valve for adjusting, the energising of 2n+2 electromagnetic valve for adjusting, after the start-up course of 30S terminates,
Loading, unloading and the stable control process of the (n+1)th stepless adjustment screw rod compressor are as follows:
(11) actual house steward's leaving water temperature or house steward enter coolant-temperature gage > house steward's leaving water temperature of setting or house steward enter coolant-temperature gage
During+precision, the (n+1)th stepless adjustment screw rod compressor loads, i.e. 2n+1 electromagnetic valve for adjusting energising, 2n+2 electromagnetic valve for adjusting breaks
Electricity；
(21) house steward's leaving water temperature of coolant-temperature gage-precision≤reality or total is entered as the house steward's leaving water temperature set or house steward
Pipe enters house steward's leaving water temperature of coolant-temperature gage≤setting or time house steward enters coolant-temperature gage+precision, and the (n+1)th stepless adjustment screw rod compressor is steady
Constant volume runs, i.e. 2n+1 electromagnetic valve for adjusting, the equal no power of 2n+2 electromagnetic valve for adjusting；
(31) when actual house steward's leaving water temperature or house steward enter coolant-temperature gage, < house steward's leaving water temperature of setting or house steward enter water temperature
Degree-precision, the (n+1)th stepless adjustment screw rod compressor unloading runs, i.e. 2n+1 electromagnetic valve for adjusting power-off, 2n+2 regulates electricity
Magnet valve is energized；
(41) enter house steward's leaving water temperature of coolant-temperature gage≤setting as actual house steward's leaving water temperature or house steward or house steward enters water
Temperature the-the first unloading value, the (n+1)th stepless adjustment screw rod compressor is out of service.
Stepless adjustment screw rod compressor, 2n-1/2n electromagnetic valve for adjusting, 2n+1/2n+2 electromagnetic valve for adjusting add unloading and patrol
Collect table as follows:
| Load electromagnetic valve | 2n-1/2n | 2n-1/2n |
| Start | Energising | Energising |
| Load | Energising | Power-off |
| Stable | Power-off | Power-off |
| Unloading | Power-off | Energising |
Further, described (n+1)th stepless adjustment screw rod compressor is opened after the n-th stepless adjustment screw rod compressor is opened
Opening, the time difference of two stepless adjustment screw rod compressor unlatchings is for set in advance, to ensure multiple stage stepless adjustment screw rod compressor
Independent startup.
After stepless adjustment screw rod compressor start, described (n+1)th stepless adjustment screw rod compressor is in actual house steward's water outlet
Temperature or house steward enter coolant-temperature gage, and < house steward's leaving water temperature of setting or house steward start unloading when entering coolant-temperature gage-precision, and n-th is stepless
Adjusting screw rod compressor enters coolant-temperature gage at actual house steward's leaving water temperature or house steward, and < house steward's leaving water temperature of setting or house steward enter water
Unloading is started during temperature-precision-fixed value.
Compared with prior art, beneficial effects of the present invention is as follows:
(1) compressor slider position sensor need not be increased, therefore in the confession significantly shortening stepless adjustment screw rod compressor
On the premise of the goods cycle, significantly reduce the purchase cost of stepless adjustment screw rod compressor.Avoid slide position sensing simultaneously
Erroneous judgement that lower water temperature is brought by the inaccurate and low precision of device and error；
(2) present invention mainly controls independently opening of stepless adjustment screw rod compressor by the multiple electromagnetic valve for adjustings of control
Move, load and unload.Realize the independent loads between multisystem stepless adjustment screw rod compressor by programme-control means to control,
Guarantee to load in water temperature the relative seriality of interval complete machine cold, improve water temperature control accuracy when loading；Pass through programme-control
Means realize the independent Unloading Control between multisystem stepless adjustment screw rod compressor, it is ensured that at the interval complete machine cold of water temperature unloading
Relative seriality, improve unloading time water temperature control accuracy；Multisystem stepless adjustment screw rod is realized by programme-control means
First entering between compressor goes out to control afterwards, improves coolant controlled precision further；Thus realize entirety and put forward high-precision purpose,
The simple in construction of the present invention, control method are simple.
Figure of description
Fig. 1 is the structural representation of the present invention；Wherein, 1, air-cooled screw compressor water chiller；2, condensation fan；3, step-less adjustment
Helical-lobe compressor；4, inflow temperature sensor；5, leaving water temperature sensors；6, switch board；7, the first electromagnetic valve for adjusting；8, second
Electromagnetic valve for adjusting；9, the 3rd electromagnetic valve for adjusting；10, the 4th electromagnetic valve for adjusting；
Fig. 2 is the water temperature control principle drawing of the present invention.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment the present invention made and elaborating further, but embodiment is also
The present invention is not limited in any form.
Embodiment 1
Such as Fig. 1, a kind of precision is high, the air-cooled screw compressor water chiller 1 of low cost, including four condensation fans 2, vaporizers
(for being not drawn in figure) and two stepless adjustment screw rod compressors 3, described two stepless adjustment screw rod compressors 3 are respectively first
Stepless adjustment screw rod compressor and the second stepless adjustment screw rod compressor, two stepless adjustment screw rod compressors 3 are respectively equipped with two
Individual electromagnetic valve for adjusting controls the independent startup of stepless adjustment screw rod compressor, loads and unload.
Further, inflow temperature sensing it is respectively equipped with at total water inlet tube of described air-cooled screw compressor water chiller and at water outlet
Device 4 and leaving water temperature sensors 5, described inflow temperature sensor 4 and leaving water temperature sensors 5 detect house steward's inflow temperature in real time
With house steward's leaving water temperature.It is provided with switch board 6 to pass with air-cooled screw compressor water chiller 1, inflow temperature sensor 4 and leaving water temperature respectively
Sensor 5 connects, and described switch board is provided with controller.
Described electromagnetic valve for adjusting is 4, respectively first electromagnetic valve for adjusting the 7, second electromagnetic valve for adjusting the 8, the 3rd regulation electricity
Magnet valve 9 and the 4th electromagnetic valve for adjusting 10, described first electromagnetic valve for adjusting 7 and corresponding first step-less adjustment of the second electromagnetic valve for adjusting 8
Helical-lobe compressor, described 3rd electromagnetic valve for adjusting 9 and the corresponding second stepless adjustment screw rod compressor of the 4th electromagnetic valve for adjusting 10.
Such as Fig. 2, a kind of precision is high, the control method of the air-cooled screw compressor water chiller of low cost, and described controller is according to setting
Fixed and actually detected to the controlled water temperature of house steward's inflow temperature, house steward's leaving water temperature and setting carry out automatic control and adjustment electricity
Being turned on and off of magnet valve, thus control the independent startup of stepless adjustment screw rod compressor 3, load and unload.
Specifically, the controlled water temperature set as house steward's leaving water temperature, actually detected to house steward's leaving water temperature > set total
During pipe leaving water temperature the+the first loaded value, the first stepless adjustment screw rod compressor start, the i.e. first electromagnetic valve for adjusting 7, second regulates
Electromagnetic valve 8 is energized, after the start-up course of 30S terminates, and loading, unloading and the stability contorting of the first stepless adjustment screw rod compressor
Process is as follows:
(1) actually detected to house steward's leaving water temperature > set house steward's leaving water temperature+precision time, the first step-less adjustment spiral shell
Bar compressor loads, the i.e. first electromagnetic valve for adjusting 7 is energized, the second electromagnetic valve for adjusting 8 power-off；
(2) the house steward's leaving water temperature-precision set≤actually detected to house steward's leaving water temperature≤setting house steward go out water temperature
During degree+precision, the first stepless adjustment screw rod compressor is stablized capacity and is run, and the i.e. first electromagnetic valve for adjusting 7 is energized, the second regulation electricity
The equal no power of magnet valve 8；
(3) < when setting house steward's leaving water temperature-precision, the first stepless adjustment screw rod compressor unloads actual house steward's leaving water temperature
Carrying row, the i.e. first electromagnetic valve for adjusting 7 power-off, the second electromagnetic valve for adjusting 8 is energized；
(4) during actual house steward's leaving water temperature≤setting house steward's leaving water temperature the-the second unloading value, the first stepless adjustment screw rod
Compressor is out of service；
Wherein, < < fixed value < sets house steward's leaving water temperature-precision and < sets house steward's water outlet the first unloading value the second unloading value
Temperature < sets house steward's leaving water temperature+precision < the first loaded value < the second loaded value.First, second unloading value, first, second add
Load value, fixed value are can setting value.
When the controlled water temperature set is as house steward's leaving water temperature, actually detected to house steward's leaving water temperature > set house steward and go out
During coolant-temperature gage the+the second loaded value, the second stepless adjustment screw rod compressor start, the i.e. the 3rd electromagnetic valve for adjusting the 9, the 4th regulates electromagnetism
Valve 10 is energized, after the start-up course of 30S terminates, and the loading of the second stepless adjustment screw rod compressor, unloading and stability contorting mistake
Journey is as follows:
(11) actual house steward's leaving water temperature > set house steward's leaving water temperature+precision time, the second stepless adjustment screw rod compressor adds
Carrying, the i.e. the 3rd electromagnetic valve for adjusting 9 is energized, the 4th electromagnetic valve for adjusting 10 power-off；
(21) when setting house steward's leaving water temperature-precision≤actual house steward's leaving water temperature≤setting house steward leaving water temperature+precision
Time, the second stepless adjustment screw rod compressor stablize capacity run, the i.e. the 3rd electromagnetic valve for adjusting the 9, the 4th electromagnetic valve for adjusting 10 is the most not
Energising；
(31) when actual house steward's leaving water temperature, < setting house steward's leaving water temperature-precision, compressor unloading runs, and the i.e. the 3rd adjusts
Economize on electricity magnet valve 9 power-off, the 4th electromagnetic valve for adjusting 10 is energized；
(41) when actual house steward's leaving water temperature≤setting house steward's leaving water temperature the-the first unloading value, the second stepless adjustment screw rod
Compressor is out of service.
Stepless adjustment screw rod compressor, the first/tri-electromagnetic valve for adjusting and the second/tetra-electromagnetic valve for adjusting add unloading logical table such as
Under:
| Load electromagnetic valve | First/the 3rd | Second/the 4th |
| Start | Energising | Energising |
| Load | Energising | Power-off |
| Stable | Power-off | Power-off |
| Unloading | Power-off | Energising |
Further, described second stepless adjustment screw rod compressor is opened after the first stepless adjustment screw rod compressor is opened
Opening, the time difference of two stepless adjustment screw rod compressor unlatchings is for set in advance, to ensure two stepless adjustment screw rod compressors
Independent startup.
After stepless adjustment screw rod compressor start, described second stepless adjustment screw rod compressor is at actual house steward's leaving water temperature
< set house steward's leaving water temperature-precision time start unloading, and the first stepless adjustment screw rod compressor actual house steward's leaving water temperature <
Unloading is started when setting house steward's leaving water temperature-precision-fixed value.To ensure that two stepless adjustment screw rod compressors independently unload
Carry.
Experimental verification: apply this control method, the result in the project of Beijing is as follows:
The parameter of air-cooled stepless screw water cooling machine set is: refrigerating capacity: 800kW, discharge: 153.4m3/h, uses 2
The stepless screw compressor system of CSR590-BH, cold-producing medium uses R22.Control house steward's leaving water temperature, wherein, set house steward's water outlet
Temperature is 7 DEG C, and precision is 0.3 DEG C, and fixed value is 6.6 DEG C, and the first loaded value is 7.5 DEG C, and the second loaded value is 8.0 DEG C, first
Unloading value is 6.0 DEG C, and the second unloading value is 6.5 DEG C, draws following test result:
| Set house steward's leaving water temperature | Actual house steward's leaving water temperature | Actual house steward's inflow temperature | Quantity opened by compressor |
| 7.0℃ | 7.2℃ | 12.3℃ | 2 |
| 7.0℃ | 6.7℃ | 11.5℃ | 2 |
| 7.0℃ | 6.9℃ | 9.2℃ | 1 |
| 7.0℃ | 7.1℃ | 8.8℃ | 1 |
From the point of view of above test the result, precision reaches ± 0.2 DEG C
Control method of the present invention is simply effective, realize air-cooled screw compressor water chiller water temperature high-precision while, do not improve
The cost of whole system.
Claims (5)
1. an air-cooled screw compressor water chiller for precision height, low cost, including multiple stage condensation fan, vaporizer and multiple stage stepless-adjustment
Joint helical-lobe compressor, multiple stage stepless adjustment screw rod compressor is respectively equipped with multiple electromagnetic valve for adjusting, it is characterised in that be provided with control
Cabinet is connected with multiple electromagnetic valve for adjustings, multiple stage stepless adjustment screw rod compressor, condensation fan and vaporizer respectively, described switch board
Be provided with controller, described controller by control multiple electromagnetic valve for adjustings be turned on and off control stepless adjustment screw rod compressor
Independent startup, load and unload；It is respectively equipped with into water temperature at total water inlet tube of described air-cooled screw compressor water chiller and at water outlet
Degree sensor and leaving water temperature sensors, described inflow temperature sensor and leaving water temperature sensors detect total water inlet tube temperature in real time
Degree and house steward's leaving water temperature；Described switch board is also connected with inflow temperature sensor and leaving water temperature sensors；
Described controller is according to setting and the controlled water of actually detected house steward's inflow temperature, house steward's leaving water temperature and the setting arrived
Temperature carries out automatically controlling being turned on and off of multiple electromagnetic valve for adjusting, thus controls the independence of multiple stage stepless adjustment screw rod compressor
Start, load and unload；
When the controlled water temperature set enters coolant-temperature gage, the actually detected house steward's leaving water temperature arrived or total as house steward's leaving water temperature or house steward
Pipe enters coolant-temperature gage > house steward's leaving water temperature of setting or house steward be when entering coolant-temperature gage the+the n-th loaded value, the n-th stepless adjustment screw rod compressor
Start, i.e. 2n-1 electromagnetic valve for adjusting, the energising of 2n electromagnetic valve for adjusting, after the start-up course of 30S terminates, the n-th step-less adjustment
The loading of helical-lobe compressor, unloading and stable control process are as follows:
Actually detected to house steward's leaving water temperature or house steward enter coolant-temperature gage > house steward's leaving water temperature of setting or house steward enter coolant-temperature gage+
During precision, the n-th stepless adjustment screw rod compressor loads, i.e. 2n-1 electromagnetic valve for adjusting energising, 2n electromagnetic valve for adjusting power-off；
The house steward's leaving water temperature set or house steward enter coolant-temperature gage-precision≤actually detected to house steward's leaving water temperature or house steward enter
When house steward's leaving water temperature of coolant-temperature gage≤setting or house steward enter coolant-temperature gage+precision, capacity stablized by the n-th stepless adjustment screw rod compressor
Run, i.e. 2n-1 electromagnetic valve for adjusting energising, the equal no power of 2n electromagnetic valve for adjusting；
Actual house steward's leaving water temperature or house steward enter coolant-temperature gage, and < house steward's leaving water temperature of setting or house steward enter coolant-temperature gage-precision
Time, the n-th stepless adjustment screw rod compressor unloading runs, i.e. 2n-1 electromagnetic valve for adjusting power-off, and 2n electromagnetic valve for adjusting is energized；
Actual house steward's leaving water temperature or house steward enter house steward's leaving water temperature of coolant-temperature gage≤setting or house steward enters coolant-temperature gage-the (n+1)th
During unloading value, the n-th stepless adjustment screw rod compressor is out of service；
Wherein, the (n+1)th unloading value < the n-th unloading value < fixed value < house steward's leaving water temperature of setting or house steward enter coolant-temperature gage-precision <
The house steward's leaving water temperature set or house steward enter coolant-temperature gage, and < house steward's leaving water temperature of setting or house steward enter coolant-temperature gage+precision, and < n-th adds
Load value < the (n+1)th loaded value, n=1,2 ....
Precision height, the air-cooled screw compressor water chiller of low cost the most according to claim 1, it is characterised in that described stepless-adjustment
Joint helical-lobe compressor is two, the respectively first stepless adjustment screw rod compressor and the second stepless adjustment screw rod compressor；Described
Electromagnetic valve for adjusting is 4, the respectively first electromagnetic valve for adjusting, the second electromagnetic valve for adjusting, the 3rd electromagnetic valve for adjusting and the 4th regulation
The corresponding first stepless adjustment screw rod compressor of electromagnetic valve, described first electromagnetic valve for adjusting and the second electromagnetic valve for adjusting, the described 3rd
Electromagnetic valve for adjusting and the corresponding second stepless adjustment screw rod compressor of the 4th electromagnetic valve for adjusting.
The control method of the air-cooled screw compressor water chiller of precision height, low cost the most according to claim 1, it is characterised in that
When the controlled water temperature set enters coolant-temperature gage as house steward's leaving water temperature or house steward, the actually detected house steward's leaving water temperature arrived or house steward
Entering coolant-temperature gage > house steward's leaving water temperature of setting or house steward be when entering coolant-temperature gage the+the (n+1)th loaded value, the (n+1)th stepless adjustment screw rod compression
Machine starts, i.e. 2n+1 electromagnetic valve for adjusting, the energising of 2n+2 electromagnetic valve for adjusting, after the start-up course of 30S terminates, and the (n+1)th nothing
The level loading of adjusting screw rod compressor, unloading and stable control process are as follows:
(11) actual house steward's leaving water temperature or house steward enter coolant-temperature gage > house steward's leaving water temperature of setting or house steward enter coolant-temperature gage+essence
When spending, the (n+1)th stepless adjustment screw rod compressor loads, i.e. 2n+1 electromagnetic valve for adjusting energising, 2n+2 electromagnetic valve for adjusting power-off；
(21) enter house steward's leaving water temperature of coolant-temperature gage-precision≤reality as the house steward's leaving water temperature set or house steward or house steward enters
When house steward's leaving water temperature of coolant-temperature gage≤setting or house steward enter coolant-temperature gage+precision, the (n+1)th stepless adjustment screw rod compressor stably holds
Amount is run, i.e. 2n+1 electromagnetic valve for adjusting, the equal no power of 2n+2 electromagnetic valve for adjusting；
(31) when actual house steward's leaving water temperature or house steward enter coolant-temperature gage < house steward's leaving water temperature of setting or house steward enter coolant-temperature gage-
Precision, the (n+1)th stepless adjustment screw rod compressor unloading runs, i.e. 2n+1 electromagnetic valve for adjusting power-off, 2n+2 electromagnetic valve for adjusting
Energising；
(41) enter house steward's leaving water temperature of coolant-temperature gage≤setting as actual house steward's leaving water temperature or house steward or house steward enters water temperature
Degree the-the first unloading value, the (n+1)th stepless adjustment screw rod compressor is out of service.
The control method of the air-cooled screw compressor water chiller of precision height, low cost the most according to claim 3, it is characterised in that
Described (n+1)th stepless adjustment screw rod compressor is opened after the n-th stepless adjustment screw rod compressor is opened, two stepless adjustment screw rods
The time difference that compressor is opened is for set in advance.
The control method of the air-cooled screw compressor water chiller of precision height, low cost the most according to claim 3, it is characterised in that
After stepless adjustment screw rod compressor start, described (n+1)th stepless adjustment screw rod compressor is at actual house steward's leaving water temperature or total
Pipe enters coolant-temperature gage, and < house steward's leaving water temperature of setting or house steward start unloading, and the n-th stepless adjustment screw rod when entering coolant-temperature gage-precision
Compressor enters coolant-temperature gage at actual house steward's leaving water temperature or house steward, and < house steward's leaving water temperature of setting or house steward enter coolant-temperature gage-essence
Unloading is started during degree-fixed value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410386228.9A CN104214982B (en) | 2014-08-07 | 2014-08-07 | A kind of precision height, the air-cooled screw compressor water chiller of low cost and control method thereof |
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| CN201410386228.9A CN104214982B (en) | 2014-08-07 | 2014-08-07 | A kind of precision height, the air-cooled screw compressor water chiller of low cost and control method thereof |
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| CN104214982B true CN104214982B (en) | 2016-10-12 |
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| CN105318588A (en) * | 2015-11-23 | 2016-02-10 | 王琳 | Double-machine-head air-cooled screw chiller water circulator |
| CN106403175B (en) * | 2016-09-12 | 2019-03-26 | 珠海格力电器股份有限公司 | The control method and water cooler of water cooler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3738116A (en) * | 1971-10-01 | 1973-06-12 | Dunham Bush Inc | Compressor unloader indicator and refrigeration system controlled thereby |
| JPH0820136B2 (en) * | 1990-01-24 | 1996-03-04 | 株式会社日立製作所 | Water cooler |
| JP2003130477A (en) * | 2001-10-30 | 2003-05-08 | Hitachi Ltd | Refrigeration device |
| CN2856870Y (en) * | 2005-11-29 | 2007-01-10 | 广东省吉荣空调设备公司 | Large capacity multi-handpiece screw rod type cold water set |
| CN203758067U (en) * | 2014-01-13 | 2014-08-06 | 上海美乐柯制冷设备有限公司 | Low-temperature water chilling unit |
| CN203980700U (en) * | 2014-08-07 | 2014-12-03 | 广东申菱空调设备有限公司 | The air-cooled screw compressor water chiller that a kind of precision is high, cost is low |
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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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