CN107560282B - The control method of cooling system - Google Patents
The control method of cooling system Download PDFInfo
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- CN107560282B CN107560282B CN201710831946.6A CN201710831946A CN107560282B CN 107560282 B CN107560282 B CN 107560282B CN 201710831946 A CN201710831946 A CN 201710831946A CN 107560282 B CN107560282 B CN 107560282B
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- coolant liquid
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- cooling system
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Abstract
The invention discloses a kind of control methods of cooling system.The control method of cooling system includes the following steps: to control whether bypass branch is in connected state according to the connection condition of bypass branch；When bypass branch is in connected state, the revolving speed of blower and/or the aperture of throttling set are adjusted according to the coolant liquid Current Temperatures of coolant liquid.The control method of cooling system of the invention is in the aperture for controlling the revolving speed and/or throttling set that adjust blower on the basis of bypass branch connection according to coolant liquid Current Temperatures, to further decrease the cooling capacity of cooling system, expand the adjustable range of the cooling capacity of cooling system.
Description
Technical field
The present invention relates to refrigerating field, in particular to a kind of control method of cooling system.
Background technique
In modern manufacturing industry, lathe is indispensable equipment.During machine, machining part and master
The heat of the generation that runs at high speed of axis will lead to the components such as the guide rail of lathe, main shaft and thermal deformation occur, so that machining accuracy is reduced,
Also reduce the service life of lathe.Therefore cooling system is needed to cool down lathe during machine.
Cooling system cools down to cooling water by making cooling water and evaporator be exchanged heat, and using by cooling
Cooling water absorb the heat generated during machine.In the prior art, it is installed with the cooling system of frequency-changeable compressor
System adjusts the cooling capacity of cooling system by adjusting the frequency of compressor.But adjustable range is relatively narrow, only 30%~
100%.
Summary of the invention
The purpose of the present invention is to provide a kind of control methods of cooling system, to expand the adjustable range of cooling capacity.
The present invention provides a kind of control method of cooling system, and the cooling system includes the refrigerating circuit that circulation has refrigerant
There is the cooling circuit of coolant liquid with circulation, the refrigerating circuit includes sequentially connected compressor, condenser, throttling set and steaming
Hair device and the bypass branch being set between the gas outlet of the compressor and the air inlet of the evaporator, the cooling system
System further includes the blower for condenser heat dissipation, and the bypass branch has connected state and off-state, the cooling
Circuit exchanges heat with the evaporator, includes the following steps:
Control whether the bypass branch is in connected state according to the connection condition of the bypass branch；
When the bypass branch is in connected state, the blower is adjusted according to the coolant liquid Current Temperatures of the coolant liquid
Revolving speed and/or the throttling set aperture.
Further, the revolving speed and/or the section of the blower are adjusted according to the coolant liquid Current Temperatures of the coolant liquid
Stream device aperture include:
Judge whether the coolant liquid Current Temperatures are lower than coolant liquid set temperature；
If the coolant liquid Current Temperatures are lower than the coolant liquid set temperature, reduce the revolving speed of the blower and/or subtract
The aperture of the small throttling set；If the coolant liquid Current Temperatures are not less than the coolant liquid set temperature, the wind is maintained
The aperture of the current revolving speed of machine and the throttling set.
Further, the cooling system is after the bypass branch is in connected state operation first time period according to institute
It states coolant liquid Current Temperatures and adjusts the revolving speed of the blower and/or the aperture of the throttling set.
Further, the throttling set includes electric expansion valve, and the aperture for adjusting the throttling set is included in 90B-
The aperture of the electric expansion valve is adjusted within the scope of 480B.
Further, the bypass branch includes by-passing valve, and branch is bypassed described in the by-passing valve action control by controlling
Road switches between the connected state and the off-state.
Further, the connection condition of the bypass branch is that coolant liquid Current Temperatures are lower than coolant liquid set temperature, root
According to the connection condition of the bypass branch control the bypass branch whether in connected state include:
Judge whether the coolant liquid Current Temperatures are lower than the coolant liquid set temperature；
If the coolant liquid Current Temperatures are lower than the coolant liquid set temperature, control the bypass branch and be in connected state
State；If the coolant liquid Current Temperatures are not less than the coolant liquid set temperature, control the bypass branch and be in an off state.
Further, the compressor is frequency-changeable compressor, controls the side according to the connection condition of the bypass branch
Logical branch whether in connected state include:
When the frequency-changeable compressor is in low-limit frequency, judge whether the coolant liquid Current Temperatures are lower than the cooling
Liquid set temperature；
If the coolant liquid Current Temperatures are lower than the coolant liquid set temperature, control the bypass branch and be in connected state
State；If the coolant liquid Current Temperatures are not less than the coolant liquid set temperature, control the bypass branch and be in an off state.
Further, cooling system basis after the frequency-changeable compressor is in low-limit frequency operation second time period
The connection condition of the bypass branch controls whether the bypass branch is in connected state.
Further, according to the connection condition of the bypass branch control the bypass branch whether be in connected state it
The preceding frequency that the frequency-changeable compressor is controlled according to the frequency conversion condition of frequency-changeable compressor.
Further, whether the frequency conversion condition of the frequency-changeable compressor is lower than the coolant liquid for coolant liquid Current Temperatures and sets
Temperature is determined, if including: coolant liquid Current Temperatures according to the frequency that the frequency conversion condition of frequency-changeable compressor controls the frequency-changeable compressor
Lower than the coolant liquid set temperature, the frequency of the frequency-changeable compressor is reduced；If coolant liquid Current Temperatures are not less than described cold
But liquid set temperature maintains or increases the current frequency of the frequency-changeable compressor.
Based on the control method of cooling system provided by the invention, include the following steps: the connection item according to bypass branch
Whether part control bypass branch is in connected state；It is current according to the coolant liquid of coolant liquid when bypass branch is in connected state
Temperature adjusts the revolving speed of blower and/or the aperture of throttling set.The control method of cooling system of the invention is in control bypass branch
The revolving speed of blower and/or the aperture of throttling set are adjusted on the basis of the connection of road according to coolant liquid Current Temperatures, thus further
The cooling capacity for reducing cooling system, expands the adjustable range of the cooling capacity of cooling system.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of the cooling system of the embodiment of the present invention；
Fig. 2 is the control method schematic diagram of the cooling system of one embodiment of the invention；
Fig. 3 is the control method schematic diagram of the cooling system of another embodiment of the present invention；
Fig. 4 is the control method schematic diagram of the cooling system of further embodiment of this invention.
Each appended drawing reference respectively represents:
1- frequency-changeable compressor；2- condenser；3- electric expansion valve；4- evaporator；5- blower；6- by-passing valve；7- lathe；8-
Water pump；9- leaving water temperature sensors；10- inflow temperature sensor；11- water flow switch.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.Simultaneously, it should be appreciated that for ease of description, each portion shown in attached drawing
The size divided not is to draw according to actual proportionate relationship.For technology, side known to person of ordinary skill in the relevant
Method and equipment may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as authorizing explanation
A part of book.In shown here and discussion all examples, any occurrence should be construed as merely illustratively, and
Not by way of limitation.Therefore, the other examples of exemplary embodiment can have different values.It should also be noted that similar label
Similar terms are indicated in following attached drawing with letter, therefore, once it is defined in a certain Xiang Yi attached drawing, then subsequent attached
It does not need that it is further discussed in figure.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices
It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and
And respective explanations are made to the opposite description in space used herein above.
As shown in Figure 1, the cooling system of the embodiment of the present invention includes that circulation has the refrigerating circuit of refrigerant and circulation to have cooling
The cooling circuit of liquid.Refrigerating circuit includes sequentially connected compressor, condenser 2, throttling set and evaporator 4 and is set to
Bypass branch P between the gas outlet of compressor and the air inlet of evaporator 4.Cooling system further includes radiating for condenser 2
Blower 5.Bypass branch P has connected state and off-state, and cooling circuit exchanges heat with evaporator 4.
As shown in Fig. 2, the control method of the cooling system includes the following steps:
Control whether bypass branch P is in connected state according to the connection condition of bypass branch P.
When bypass branch P is in connected state, according to the coolant liquid Current Temperatures of coolant liquid adjust blower revolving speed and/or
The aperture of throttling set.
When the thermic load of cooling circuit is smaller, it can control bypass branch P and be in connected state so that compressor goes out
The part high temperature and pressure cold media gas of port outflow is directly entered in evaporator without condenser and throttling set, is improved and is entered
The temperature of the refrigerant of evaporator, to reduce the cooling capacity of cooling system.When bypass branch P is in connected state, may be used also
To adjust the revolving speed of blower and/or the aperture of throttling set according to coolant liquid Current Temperatures, the cold of cooling system is further decreased
But ability.In summary, the control method of the cooling system of embodiment of the present invention root on the basis of controlling bypass branch connection
The revolving speed of blower and/or the aperture of throttling set are adjusted according to coolant liquid Current Temperatures, to further decrease the cold of cooling system
But ability expands the adjustable range of the cooling capacity of cooling system.
Preferably, it is repeated when bypass branch is in connected state and adjusts turning for blower according to coolant liquid Current Temperatures
The aperture of speed and/or throttling set.
As shown in figure 3, specifically, adjusting the revolving speed of blower according to the coolant liquid Current Temperatures of coolant liquid and/or throttling filling
The aperture set includes:
Judge whether coolant liquid Current Temperatures are lower than coolant liquid set temperature；
If coolant liquid Current Temperatures are lower than coolant liquid set temperature, reduce the revolving speed of blower and/or reduce throttling set
Aperture.If coolant liquid Current Temperatures are not less than coolant liquid set temperature, the revolving speed and throttling set for maintaining blower current are opened
Degree.
The control method of the cooling system of the present embodiment is by first determining whether coolant liquid Current Temperatures are lower than coolant liquid
Set temperature, and then the revolving speed of blower and the aperture of throttling set are adjusted with the cooling energy to cooling system according to judging result
Power is adjusted in real time.
Illustrate that the cooling capacity of cooling system at this time is higher when coolant liquid Current Temperatures are lower than coolant liquid set temperature, needs
It is allowed to cool ability reduction, take the revolving speed for reducing blower at this time and/or reduces the method for the aperture of throttling set, reduces wind
The revolving speed of machine can be improved the temperature into refrigerant in evaporator thus reduce cooling capacity.Similarly, reduce opening for throttling set
Degree, which can increase from the coolant quantity that bypass branch enters evaporator, further decreases cooling capacity.
It should be noted that the aperture and cooling system of the reduction throttling set in the embodiment of the present invention normally make
It is different with the range of the reduction aperture under operating condition, the embodiment of the present invention continues other than the normal open range of throttling set
Reduce the aperture of conclusion device.
In order to improve the accuracy of accuracy of measurement and control, cooling system is in connected state operation in bypass branch
The revolving speed of blower and/or the aperture of throttling set are adjusted after first time period according to coolant liquid Current Temperatures.Cooling system is on side
Logical branch enters more stable working condition after being in connected state operation first time period, according to cooling under this working condition
The accuracy of control can be improved in the aperture of liquid Current Temperatures adjusting rotation speed of fan and throttling set.
It is described in detail below according to control method of the Fig. 1 to Fig. 4 to the cooling system of a specific embodiment of the invention.
As shown in Figure 1, the compressor of the cooling system of the present embodiment is frequency-changeable compressor 1, throttling set is electronic expansion
Valve 3.Refrigerating circuit includes frequency-changeable compressor 1, condenser 2, electric expansion valve 3, evaporator 4, the blower to radiate for condenser 2
It is set on the 5 and bypass branch P that is set between the gas outlet of frequency-changeable compressor 1 and the air inlet of evaporator 4, bypass branch P
By-passing valve 6 is equipped with to control bypass branch between connected state and off-state and switch.
The cooling system of the present embodiment is by cooling down lathe 7 using cooling water.Cooling water and evaporator 4 carry out
Heat exchange.Cooling water enters from water inlet I to generate heat exchange with the refrigerant in evaporator in evaporator, is steamed from water outlet O outflow
The cooling water after cooling of device 4 is sent out, to cool down to lathe 7.The cooling water for absorbing lathe heat dissipation is pumped to water inlet by water pump 8
At I.Cooling system further includes the water flow switch 11 being set on cooling circuit.
The cooling system of the present embodiment further includes the inflow temperature sensor 10 being set at water inlet I and is set to water outlet
Leaving water temperature sensors 9 at mouth O.Leaving water temperature sensors 9 can be carried out to by the temperature of evaporator cooling water after cooling
Real-time measurement.
As shown in figure 4, control cooling system booting first.It is currently warm according to cooling water during controlling cooling system
It spends and judges how cooling system acts the temperature difference between cooling water set temperature.
First determine whether cooling water Current Temperatures are higher than cooling water set temperature.
If judging result is that cooling water Current Temperatures are higher than cooling water set temperature, controls frequency-changeable compressor and increase frequency
To improve the cooling capacity of cooling system；If judging result is that cooling water Current Temperatures are set not higher than the cooling water of cooling system
Temperature then further judges whether cooling water Current Temperatures are lower than cooling water set temperature, if cooling water Current Temperatures are not less than
Cooling water set temperature then maintains the current frequency of frequency-changeable compressor.If cooling water Current Temperatures are lower than cooling water set temperature
Whether the frequency for then judging frequency-changeable compressor is low-limit frequency, and the frequency of compressor is reduced if not for low-limit frequency to minimum
Frequency.The adjustable range of this stage electric expansion valve 3 is 120B-480B, at this time the adjustable range of the cooling capacity of cooling system
For 30%-100%.
After the frequency of frequency-changeable compressor is reduced to low-limit frequency, continue to judge whether cooling water Current Temperatures are lower than cold
But water set temperature.If cooling water Current Temperatures again below cooling water set temperature, control by-passing valve 6 at this time and open so that other
Logical branch connection.In the adjustable range or 120B-480B of this stage electric expansion valve 3, the cooling capacity of cooling system at this time
Adjustable range minimum value be 15%-20%.If cooling water Current Temperatures are not less than cooling water set temperature, control is other at this time
Port valve 6 remains turned-off so that bypass branch disconnects.
Continue to judge whether cooling water Current Temperatures are lower than cooling water setting temperature after bypass branch is in first time period
Degree, if cooling water Current Temperatures still are below cooling water set temperature, reduce the revolving speed of blower and turns down electric expansion valve
Aperture make the cooling capacity of cooling system continue to reduce.The adjustable range of this stage electric expansion valve is widened to 90B-
480B.The adjustable range of the cooling capacity of cooling system is 10%-100% at this time.
From the foregoing, it will be observed that the cooling system of the embodiment of the present invention can continue through reduction in the case where bypass branch is connected to
The revolving speed of blower and the adjustable range of electric expansion valve is widened to reach the mesh for the cooling capacity for further decreasing cooling system
, thus the adjustable range of the cooling capacity of cooling system can be expanded.
It should be noted that above-mentioned " aperture for turning down electric expansion valve " is referred in electric expansion valve normal use
The aperture of electric expansion valve is turned down in the range of in addition.Specifically in the present embodiment, electric expansion valve opening in normal use
Degree range is 120B-480B.In the present embodiment, the aperture of electric expansion valve is adjusted in range 90B-480B.And electronics
For expansion valve in normal use, the control of aperture is controlled according to the degree of superheat, and by electronic expansion in the present embodiment
When the adjustable range of valve continues to turn down the aperture of electric expansion valve after widening, the aperture of electric expansion valve is working as according to cooling water
Preceding temperature controls.
Preferably, the aperture of above-mentioned by-passing valve is adjustably arranged, thus can by adjust by-passing valve aperture come pair
The coolant quantity of bypass branch circulation is more accurately controlled.
In order to make cooling system that can form stable working condition after the frequency shift of frequency-changeable compressor to measure
Temperature it is more accurate, it is preferable that cooling system is in after low-limit frequency section after second time period in frequency-changeable compressor to be judged again
Whether coolant liquid Current Temperatures are lower than coolant liquid set temperature.
In summary, the control method of the cooling system of the present embodiment can continue through reduction after bypass branch connection
The revolving speed of blower and reduce the aperture of electric expansion valve to further decrease the cooling capacity of cooling system, to expand cooling
The adjustable range of the cooling capacity of system.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, it should be understood by those ordinary skilled in the art that: still
It can modify to a specific embodiment of the invention or some technical features can be equivalently replaced；Without departing from this hair
The spirit of bright technical solution should all cover within the scope of the technical scheme claimed by the invention.
Claims (8)
1. a kind of control method of cooling system, the cooling system includes that circulation has the refrigerating circuit of refrigerant and circulation to have cooling
The cooling circuit of liquid, the refrigerating circuit include sequentially connected compressor, condenser (2), throttling set and evaporator (4) with
And it is set to the bypass branch (P) between the gas outlet of the compressor and the air inlet of the evaporator (4), the cooling system
System further includes the blower (5) for the condenser (2) heat dissipation, and the bypass branch (P) has connected state and off-state,
The cooling circuit exchanges heat with the evaporator (4), which comprises the steps of:
Control whether the bypass branch is in connected state according to the connection condition of the bypass branch；
When the bypass branch is in connected state, turning for the blower is adjusted according to the coolant liquid Current Temperatures of the coolant liquid
The aperture of the fast and/or described throttling set；
Wherein,
The connection condition of the bypass branch is that coolant liquid Current Temperatures are lower than coolant liquid set temperature, according to the bypass branch
Connection condition to control the bypass branch whether to be in connected state include: to judge whether the coolant liquid Current Temperatures are lower than
The coolant liquid set temperature；If the coolant liquid Current Temperatures are lower than the coolant liquid set temperature, the bypass branch is controlled
Road is in connected state；If the coolant liquid Current Temperatures are not less than the coolant liquid set temperature, the bypass branch is controlled
It is in an off state；
The compressor is frequency-changeable compressor (1), whether controls the bypass branch according to the connection condition of the bypass branch
It include: to judge whether the coolant liquid Current Temperatures are low when the frequency-changeable compressor is in low-limit frequency in connected state
In the coolant liquid set temperature；If the coolant liquid Current Temperatures are lower than the coolant liquid set temperature, the bypass is controlled
Branch is in connected state；If the coolant liquid Current Temperatures are not less than the coolant liquid set temperature, the bypass branch is controlled
Road is in an off state.
2. the control method of cooling system according to claim 1, which is characterized in that worked as according to the coolant liquid of the coolant liquid
The aperture of revolving speed and/or the throttling set that preceding temperature adjusts the blower includes:
Judge whether the coolant liquid Current Temperatures are lower than coolant liquid set temperature；
If the coolant liquid Current Temperatures are lower than the coolant liquid set temperature, reduce the revolving speed of the blower and/or reduce institute
State the aperture of throttling set；If the coolant liquid Current Temperatures are not less than the coolant liquid set temperature, the blower is maintained to work as
The aperture of preceding revolving speed and the throttling set.
3. the control method of cooling system according to claim 1, which is characterized in that the cooling system is in the bypass
Branch be in connected state operation first time period after according to the coolant liquid Current Temperatures adjust the blower revolving speed and/or
The aperture of the throttling set.
4. the control method of cooling system according to claim 1, which is characterized in that the throttling set includes that electronics is swollen
Swollen valve (3), the aperture for adjusting the throttling set include that opening for the electric expansion valve (3) is adjusted within the scope of 90B-480B
Degree.
5. the control method of cooling system according to claim 1, which is characterized in that the bypass branch includes by-passing valve
(6), by controlling bypass branch described in by-passing valve (6) action control between the connected state and the off-state
Switching.
6. the control method of cooling system according to any one of claim 1 to 5, which is characterized in that the cooling system
System controls after the frequency-changeable compressor is in low-limit frequency operation second time period according to the connection condition of the bypass branch
Whether the bypass branch is in connected state.
7. the control method of cooling system according to any one of claim 1 to 5, which is characterized in that according to the side
The connection condition of logical branch controls whether the bypass branch is in connected state before according to the frequency conversion condition of frequency-changeable compressor
Control the frequency of the frequency-changeable compressor.
8. the control method of cooling system according to claim 7, which is characterized in that the frequency conversion item of the frequency-changeable compressor
Part is whether coolant liquid Current Temperatures are lower than the coolant liquid set temperature, according to the control of the frequency conversion condition of frequency-changeable compressor
If the frequency of frequency-changeable compressor includes: coolant liquid Current Temperatures lower than the coolant liquid set temperature, the frequency conversion compression is reduced
The frequency of machine；If coolant liquid Current Temperatures are not less than the coolant liquid set temperature, the frequency-changeable compressor is maintained or increased
Current frequency.
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| CN201710831946.6A CN107560282B (en) | 2017-09-15 | 2017-09-15 | The control method of cooling system |
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| CN201710831946.6A CN107560282B (en) | 2017-09-15 | 2017-09-15 | The control method of cooling system |
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| CN107560282B true CN107560282B (en) | 2019-10-22 |
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| CN110822750A (en) * | 2019-12-11 | 2020-02-21 | 郑州长城科工贸有限公司 | Fluid temperature control system and control method based on cascade closed-loop PID regulation |
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| CN101769662A (en) * | 2008-12-31 | 2010-07-07 | 财团法人工业技术研究院 | Frequency conversion energy-saving temperature control device of refrigerating device |
| CN203045166U (en) * | 2013-01-21 | 2013-07-10 | 苏州迅镭激光科技有限公司 | Cooling device of laser welding machine |
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|---|---|---|---|---|
| JPH1030840A (en) * | 1996-07-17 | 1998-02-03 | N T T Facilities:Kk | Air conditioner |
| JP2007187345A (en) * | 2006-01-11 | 2007-07-26 | Kobe Steel Ltd | Heat pump system |
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