CN107401864A - Antifreeze cooling system and antifreeze cooling control method - Google Patents
Antifreeze cooling system and antifreeze cooling control method Download PDFInfo
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- CN107401864A CN107401864A CN201710804582.2A CN201710804582A CN107401864A CN 107401864 A CN107401864 A CN 107401864A CN 201710804582 A CN201710804582 A CN 201710804582A CN 107401864 A CN107401864 A CN 107401864A
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- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/14—Methods or arrangements for maintaining a constant temperature in parts of machine tools
- B23Q11/141—Methods or arrangements for maintaining a constant temperature in parts of machine tools using a closed fluid circuit for cooling or heating
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The present invention discloses a kind of antifreeze cooling system and antifreeze cooling control method, is related to cooling control field.Wherein antifreeze cooling system includes refrigerating circuit and cooling circuit, bypass branch is provided with refrigerating circuit, the both ends of bypass branch connect with the entrance of condenser in refrigerating circuit and the entrance of the evaporator respectively, and the coolant in the refrigerant and cooling circuit in refrigerating circuit carries out heat exchange.By increasing bypass branch in refrigeration branch, so that the part refrigerant in refrigerating circuit is provided directly to evaporator without condenser refrigeration, so as to effectively avoid evaporator from being damaged by frost because temperature is too low.
Description
Technical field
The present invention relates to cooling control field, more particularly to a kind of antifreeze cooling system and antifreeze cooling control method.
Background technology
In modern manufacturing industry, lathe is indispensable equipment, such as CNC (Computer Numerical
Control, numerically-controlled machine tool), grinding machine, wire cutting machine tool etc..When machine, Tool in Cutting workpiece, main shaft
Run at high speed and can all produce substantial amounts of heat, cause the guide rail of lathe, main shaft that thermal deformation occurs, so as to reduce workpiece plus
Work precision, also reduce the life-span of cutter, main shaft.Therefore just there is the demand cooled down to lathe.Such as oil cooling machine (is also referred to as
Be Cool oil machine) the effect of lathe cooler be to be effectively reduced heat caused by machine cut, there is provided machine finish.
Current lathe cooling machine system as described in Figure 1, is provided with refrigerating circuit 1 and cooled back in lathe cooling machine system
Compressor 11, condenser 12, electric expansion valve 13 are set gradually according to refrigerant flow direction and steam in road 2, wherein refrigerating circuit 1
Device 14 is sent out, blower fan 15 is additionally provided with condenser 12.Pump 21 is provided with cooling circuit 2, in the presence of pump 21, coolant is cooling down
Flowed on loop 2, so as to which heat caused by lathe be discharged by evaporator 14.Arrow in Fig. 1 represents coolant
Flow direction.
At present, the generally use plate type heat exchanger of evaporator 14.It is excellent that plate type heat exchanger has that size is small, heat exchange property is good
Point, but there is also easy the shortcomings that blocking for plate type heat exchanger.In order to avoid plate type heat exchanger is blocked, it will usually utilized
Filter is available to plate type heat exchanger after coolant is carried out into filtration treatment.
Once however, filter failure, plate type heat exchanger will block, so as to evaporator be caused to be damaged by frost.
The content of the invention
The embodiment of the present invention provides a kind of antifreeze cooling system and antifreeze cooling control method, by increasing in refrigeration branch
Add bypass branch, so that part refrigerant is provided directly to evaporator without condenser refrigeration, so as to effectively avoid evaporating
Device is damaged by frost because temperature is too low.
According to an aspect of the present invention, there is provided a kind of antifreeze cooling system, including refrigerating circuit and cooling circuit, refrigeration
Bypass branch is provided with loop, wherein：
Coolant in refrigerant and cooling circuit in refrigerating circuit carries out heat exchange；
The both ends of bypass branch connect with the entrance of condenser in refrigerating circuit and the entrance of evaporator respectively.
In one embodiment, bypass branch is provided with by-passing valve.
In one embodiment, said system also includes the first temperature sensor, wherein：
First temperature sensor be used for detect by with the coolant temperature after refrigerant heat exchange.
In one embodiment, said system also includes second temperature sensor, wherein：
Second temperature sensor is used for the temperature for detecting refrigerant in evaporator.
In one embodiment, said system also includes control device, wherein：
What the current coolant temperature and second temperature sensor that control device detects according to the first temperature sensor detected
Current refrigerant temperature, electricity in the working frequency of compressor, and/or refrigerating circuit in the valve opening, refrigerating circuit to by-passing valve
The aperture of sub- expansion valve is adjusted.
In one embodiment, control device at predetermined intervals, it is pre- to judge whether current coolant temperature is more than
If temperature value, if current coolant temperature is not more than preset temperature value, close compressor.
In one embodiment, control device judges to work as in the case where current coolant temperature is more than preset temperature value
Whether preceding refrigerant temperature is more than the first temperature threshold, if refrigerant temperature is not more than the first temperature threshold, determines whether current
Whether duration of the refrigerant temperature in second temperature thresholding to the first temperature threshold section exceedes constant temperature thresholding, if holding
The continuous time exceedes constant temperature thresholding, then the frequency of compressor is reduced, wherein the first temperature threshold is more than second temperature thresholding.
In one embodiment, control device is additionally operable to, in the case where the duration is not less than constant temperature thresholding, enter
One step judges whether the temperature drop rate of refrigerant in evaporator is more than temperature drop rate thresholding, if the temperature drop rate of refrigerant is more than temperature drop speed
Rate thresholding, then increase the aperture of electric expansion valve.
In one embodiment, control device is additionally operable to the situation for being not more than temperature drop rate thresholding in the temperature drop rate of refrigerant
Under, judge whether current refrigerant temperature is more than second temperature thresholding, if current refrigerant temperature is not more than second temperature thresholding, enter
One step judges whether current refrigerant temperature is more than the 3rd temperature threshold, if current refrigerant temperature is not more than the 3rd temperature threshold,
By-passing valve is opened, wherein the 3rd temperature threshold is less than second temperature thresholding.
In one embodiment, control device is additionally operable in the case where current refrigerant temperature is more than the 3rd temperature threshold,
Determine whether the temperature drop rate of refrigerant in evaporator is more than temperature drop rate thresholding, if the temperature drop rate of refrigerant is more than temperature drop
Rate threshold, then by-passing valve is opened, if the temperature drop rate of refrigerant is not more than temperature drop rate thresholding, reduce the frequency of compressor.
In one embodiment, control device judges whether current refrigerant temperature is big also further after by-passing valve is opened
In the 4th temperature threshold, if refrigerant temperature is not more than the 4th temperature threshold, close compressor, wherein the 4th temperature threshold is less than
3rd temperature threshold.
In one embodiment, control device enters one also in the case where current refrigerant temperature is more than the 4th temperature threshold
Step judges whether current refrigerant temperature exceedes constant temperature thresholding in the duration of the 4th temperature threshold to the 3rd temperature threshold,
If the duration not less than constant temperature thresholding, repeats and judges whether current refrigerant temperature is more than the first temperature threshold
Step；If the duration exceedes constant temperature thresholding, close compressor.
In one embodiment, control device is additionally operable in the case where current refrigerant temperature is more than second temperature thresholding,
Determine whether current refrigerant temperature exceedes temperature in the duration of second temperature thresholding to the first temperature threshold section
Continue thresholding, if the duration exceedes constant temperature thresholding, close by-passing valve.
In one embodiment, evaporator is coaxial sleeve heat exchanger.
According to another aspect of the present invention, there is provided a kind of antifreeze cooling control method, including：
Detect in cooling circuit by with the coolant temperature after refrigerant heat exchange in refrigerating circuit, and in refrigerating circuit
The temperature of refrigerant in evaporator；
According to the current coolant temperature of detection and current refrigerant temperature, the valve of the by-passing valve on bypass branch is opened
Degree, the aperture of electric expansion valve is adjusted in the working frequency of compressor, and/or refrigerating circuit in refrigerating circuit；
Wherein, the coolant in the refrigerant and cooling circuit in refrigerating circuit carries out heat exchange；Side is provided with refrigerating circuit
Logical branch road, the both ends of bypass branch connect with the entrance of condenser in refrigerating circuit and the entrance of evaporator respectively.
In one embodiment, according to the current coolant temperature of detection and current refrigerant temperature, on bypass branch
The aperture of electric expansion valve is entered in the working frequency of compressor, and/or refrigerating circuit in the valve opening of by-passing valve, refrigerating circuit
Row regulation includes：
At predetermined intervals, judge whether current coolant temperature is more than preset temperature value；
If current coolant temperature is not more than preset temperature value, close compressor.
In one embodiment, in the case where current coolant temperature is more than preset temperature value, current refrigerant temperature is judged
Whether degree is more than the first temperature threshold；
If refrigerant temperature is not more than the first temperature threshold, determine whether current refrigerant temperature in second temperature thresholding extremely
Whether the duration in the first temperature threshold section exceedes constant temperature thresholding, wherein the first temperature threshold is more than second temperature
Thresholding；
If the duration exceedes constant temperature thresholding, the frequency of compressor is reduced.
In one embodiment, in the case where the duration is not less than constant temperature thresholding, evaporator is determined whether
Whether the temperature drop rate of interior refrigerant is more than temperature drop rate thresholding；
If the temperature drop rate of refrigerant is more than temperature drop rate thresholding, increase the aperture of electric expansion valve.
In one embodiment, in the case where the temperature drop rate of refrigerant is not more than temperature drop rate thresholding, judge current cold
Whether matchmaker's temperature is more than second temperature thresholding；
If current refrigerant temperature is not more than second temperature thresholding, determine whether current refrigerant temperature is more than the 3rd
Temperature threshold, wherein the 3rd temperature threshold is less than second temperature thresholding；
If current refrigerant temperature is not more than the 3rd temperature threshold, by-passing valve is opened.
In one embodiment, in the case where current refrigerant temperature is more than the 3rd temperature threshold, determine whether to evaporate
Whether the temperature drop rate of refrigerant is more than temperature drop rate thresholding in device；
If the temperature drop rate of refrigerant is more than temperature drop rate thresholding, by-passing valve is opened；
If the temperature drop rate of refrigerant is not more than temperature drop rate thresholding, the frequency of compressor is reduced.
In one embodiment, after by-passing valve is opened, judge whether current refrigerant temperature is more than the 4th temperature threshold, its
In the 4th temperature threshold be less than the 3rd temperature threshold；
If refrigerant temperature is not more than the 4th temperature threshold, close compressor.
In one embodiment, in the case where current refrigerant temperature is more than the 4th temperature threshold, determine whether current
Whether refrigerant temperature exceedes constant temperature thresholding in the duration of the 4th temperature threshold to the 3rd temperature threshold；
If the duration not less than constant temperature thresholding, repeats and judges whether current refrigerant temperature is more than the first temperature
The step of spending thresholding；
If the duration exceedes constant temperature thresholding, close compressor.
In one embodiment, in the case where current refrigerant temperature is more than second temperature thresholding, determine whether current
Whether refrigerant temperature exceedes constant temperature thresholding in the duration of second temperature thresholding to the first temperature threshold section；
If the duration exceedes constant temperature thresholding, by-passing valve is closed.
By referring to the drawings to the present invention exemplary embodiment detailed description, further feature of the invention and its
Advantage will be made apparent from.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the schematic diagram of lathe cooling machine system one embodiment in the prior art.
Fig. 2 is the schematic diagram of the antifreeze cooling system one embodiment of the present invention.
Fig. 3 is the schematic diagram of the antifreeze another embodiment of cooling system of the present invention.
Fig. 4 is the schematic diagram of the antifreeze another embodiment of cooling system of the present invention.
Fig. 5 is the schematic diagram of the antifreeze cooling control method one embodiment of the present invention.
Fig. 6 is the schematic diagram of the antifreeze another embodiment of cooling control method of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Below
Description only actually at least one exemplary embodiment is illustrative, is never used as to the present invention and its application or makes
Any restrictions.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of protection of the invention.
Unless specifically stated otherwise, the part and positioned opposite, the digital table of step otherwise illustrated in these embodiments
Do not limited the scope of the invention up to formula and numerical value.
Simultaneously, it should be appreciated that for the ease of description, the size of the various pieces shown in accompanying drawing is not according to reality
Proportionate relationship draw.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined, then it need not be further discussed in subsequent accompanying drawing in individual accompanying drawing.
Fig. 2 is the schematic diagram of the antifreeze cooling system one embodiment of the present invention.As shown in Fig. 2 antifreeze cooling system includes
Refrigerating circuit 1 and cooling circuit 2, bypass branch 3 is provided with refrigerating circuit 1.Wherein：
Coolant in refrigerant and cooling circuit 2 in refrigerating circuit 1 carries out heat exchange, the both ends difference of bypass branch 3
Connected with the entrance of the entrance of condenser 12 and evaporator 14 in refrigerating circuit 1.So as to which refrigerant is in cyclic process, part refrigerant
Not by condenser, but the entrance of evaporator is directly reached by bypass branch, so that HTHP refrigerant and low temperature
Low pressure refrigerant enters evaporator after being mixed.The refrigeration for not passed through condenser due to this part refrigerant is handled, therefore can be true
Protect evaporator temperature and be unlikely to too low.
For example, the coolant in refrigerant and cooling circuit 2 in refrigerating circuit 1 can be in the evaporator 14 of refrigerating circuit 1
Carry out heat exchange.
Alternatively, evaporator 14 can be coaxial sleeve heat exchanger or barrel type heat exchanger etc., so as to effectively overcome plate-type heat-exchange
Device easily occur block, it is freezing the defects of.
The antifreeze cooling system provided based on the above embodiment of the present invention, by increasing bypass branch in refrigeration branch,
So that part refrigerant is provided directly to evaporator without condenser refrigeration, so as to effectively avoid evaporator too low because of temperature
And it is damaged by frost.
Fig. 3 is the schematic diagram of the antifreeze another embodiment of cooling system of the present invention.As shown in figure 3, also set on bypass branch 3
There is by-passing valve 31.By adjusting the aperture of by-passing valve 31, the coolant quantity of bypass branch is may be adjusted by, to adjust evaporator
Temperature.
Fig. 4 is the schematic diagram of the antifreeze another embodiment of cooling system of the present invention.As shown in figure 4, in antifreeze cooling system
Also include the first temperature sensor 4, for detect by with the coolant temperature after refrigerant heat exchange.
In addition, second temperature sensor 5 is may also include in antifreeze cooling system, for detecting refrigerant in evaporator 14
Temperature.
Alternatively, control device (being not shown) is also included in antifreeze cooling system.Wherein, control device according to
The current refrigerant temperature of current coolant temperature and second temperature sensor 5 detection of first temperature sensor 4 detection, to bypass
Electric expansion valve 13 is opened in the working frequency of compressor 11, and/or refrigerating circuit 1 in the valve opening of valve 31, refrigerating circuit 1
Degree is adjusted.So as to avoid evaporator from being damaged by frost because temperature is too low.
Below by a specific example, the control program of control device is illustrated.
1) control device at predetermined intervals, judges whether the current coolant temperature of evaporator is more than preset temperature
Value, if current coolant temperature is not more than preset temperature value, close compressor 11.
That is, if current coolant temperature is less than or equal to preset temperature value X, show to work as front evaporator refrigerant temperature mistake
It is low, at this moment can close compressor.
2) control device judges the current refrigerant of evaporator in the case where current coolant temperature is more than preset temperature value
Whether temperature (hereinafter referred to as evaporating temperature) is more than the first temperature threshold T1, if evaporating temperature is more than the first temperature threshold T1,
Current compressor working frequency can be maintained constant.
If 3) evaporating temperature is not more than the first temperature threshold T1, control device determines whether current evaporating temperature
Whether the duration in two temperature threshold T2 to the first temperature threshold T1 sections exceedes constant temperature thresholding, if the duration surpasses
Excess temperature continues thresholding B, then the frequency of compressor 11 is reduced, wherein the first temperature threshold T1 is more than second temperature thresholding T2.
That is, now can be to pressure if the refrigerant temperature in evaporator is in [T2, T1] section and the duration exceedes thresholding B
Contracting machine carries out down conversion process, so as to avoid refrigerant temperature change excessive.
4) control device is additionally operable to, in the case where the duration is not less than constant temperature thresholding B, determine whether to evaporate
Whether the temperature drop rate of refrigerant is more than temperature drop rate thresholding E in device 14, if the temperature drop rate of refrigerant is more than temperature drop rate thresholding E,
Then increase the aperture of electric expansion valve 13.
That is, if the temperature drop speed of refrigerant exceedes thresholding E, the temperature of refrigerant can be slowed down by adjusting the aperture of electric expansion valve
Reduction of speed degree.
5) control device is additionally operable to, in the case where the temperature drop rate of refrigerant is not more than temperature drop rate thresholding E, judge current
Whether evaporating temperature is more than second temperature thresholding T2, if current evaporating temperature is more than second temperature thresholding, determines whether to work as
Whether front evaporator temperature exceedes constant temperature thresholding in second temperature thresholding T2 to the first temperature threshold T1 sections duration
B, if the duration exceedes constant temperature thresholding, close by-passing valve 31；If the duration, can not less than constant temperature thresholding
Maintain the present operating frequency of compressor constant.
That is, be more than T2 and duration more than B in the current refrigerant temperature of evaporator, by-passing valve can be closed, i.e., it is but preceding
Refrigerant temperature is suitable, and bypass processing is carried out without the refrigerant in refrigerating circuit.
6) if current evaporating temperature is not more than second temperature thresholding T2, determine whether current evaporating temperature is more than
3rd temperature threshold T3, if current evaporating temperature is not more than the 3rd temperature threshold T3, by-passing valve 31 is opened, wherein the 3rd temperature
Thresholding T3 is less than second temperature thresholding T2.
That is, when the current refrigerant temperature of evaporator is too low, by-passing valve is opened, to realize not equality of temperature in refrigerating circuit
Spend the mixing of refrigerant.
7) control device is additionally operable to, in the case where current evaporating temperature is more than the 3rd temperature threshold T3, determine whether to steam
Whether the temperature drop rate of refrigerant is more than temperature drop rate thresholding E in hair device 14, if the temperature drop rate of refrigerant is more than temperature drop rate thresholding
E, then by-passing valve 31 is opened, if the temperature drop rate of refrigerant is not more than temperature drop rate thresholding E, reduce the frequency of compressor 11.
That is, evaporating temperature be also not at it is too low in the case of, but temperature drop speed exceedes thresholding E, to protect system, now
Also by-passing valve can be opened.
8) control device judges whether current evaporating temperature is more than the 4th temperature door also further after by-passing valve 31 is opened
T4 is limited, if evaporating temperature is not more than the 4th temperature threshold T4, close compressor, wherein the 4th temperature threshold T4 is less than the 3rd temperature
Spend thresholding T3.
For example, T4 is smaller than zero degree, T3 can be slightly higher than zero degree.
That is, after by-passing valve is opened, evaporating temperature is still too low, is now protection system safety, can close compressor.
9) control device determines whether currently to steam also in the case where current evaporating temperature is more than the 4th temperature threshold T4
Whether hair temperature exceedes constant temperature thresholding in the 4th temperature threshold T4 to the 3rd temperature threshold T3 duration, if continue
Between not less than constant temperature thresholding B, then repeat and the step of whether current evaporating temperature is more than the first temperature threshold judged, with
Just circular treatment is carried out；If the duration exceedes constant temperature thresholding B, close compressor.
If i.e., although evaporating temperature is not very too low, the duration in [T4, T3] this section exceedes thresholding B, table
Bright bypass branch of opening is not improved evaporating temperature, is at this moment protection system safety, can close compressor.
In addition, can also by the way that the pump 21 in cooling circuit 2 is set into variable frequency pump, so as to when coolant temperature is relatively low,
The frequency of pump 21 is increased, to increase the flow of cooling agent, to improve the temperature of refrigerant in evaporator.
Fig. 5 is the schematic diagram of the antifreeze cooling control method one embodiment of the present invention.Wherein：
Step 501, detect cooling circuit in by with the coolant temperature after refrigerant heat exchange in refrigerating circuit, and system
In cold loop in evaporator refrigerant temperature.
Step 502, according to the temperature of refrigerant in the current coolant temperature and evaporator of detection, to the side on bypass branch
The aperture of electric expansion valve is carried out in the working frequency of compressor, and/or refrigerating circuit in the valve opening of port valve, refrigerating circuit
Regulation.
Wherein, the coolant in the refrigerant and cooling circuit in refrigerating circuit carries out hot friendship in the evaporator of refrigerating circuit
Change；It is provided with bypass branch in refrigerating circuit, the both ends of the bypass branch entrance and evaporator with condenser in refrigerating circuit respectively
Entrance connection.
The antifreeze cooling control method provided based on the above embodiment of the present invention, by increasing bypass branch in refrigeration branch
Road, so that part refrigerant is provided directly to evaporator without condenser refrigeration, according to the current coolant temperature of detection
With the temperature of refrigerant in evaporator, the work frequency of compressor in the valve opening, refrigerating circuit to the by-passing valve on bypass branch
The aperture of electric expansion valve is adjusted in rate, and/or refrigerating circuit, by so as to effectively avoid evaporator because temperature it is too low and
It is damaged by frost.
Below by specific example, the present invention will be described, as shown in Figure 6.
Step 601, at predetermined intervals, judge whether current coolant temperature is more than preset temperature value X.
If current coolant temperature is more than preset temperature value X, step 602 is performed；If current coolant temperature is not more than
Preset temperature value X, then perform step 614.
Step 602, judge whether current evaporating temperature (refrigerant temperature i.e. in evaporator) is more than the first temperature threshold T1.
If evaporating temperature is more than the first temperature threshold T1, step 603 is performed；If evaporating temperature is not more than the first temperature door
T1 is limited, then performs step 604.
Step 603, the work on hand frequency of compressor is maintained.
Step 604, duration of the current evaporating temperature in second temperature thresholding to the first temperature threshold section is judged
Whether constant temperature thresholding B is exceeded, wherein the first temperature threshold is more than second temperature thresholding.
If the duration exceedes constant temperature thresholding, step 605 is performed；If the duration is not less than constant temperature thresholding
B, perform step 606.
Step 605, the working frequency of compressor is reduced.
Step 606, judge whether the temperature drop rate of refrigerant in evaporator is more than temperature drop rate thresholding E.
If the temperature drop rate of refrigerant is more than temperature drop rate thresholding E, step 607 is performed；If the temperature drop rate of refrigerant is little
In temperature drop rate thresholding E, then step 608 is performed.
Step 607, the aperture of electric expansion valve is increased.
Step 608, judge whether current evaporating temperature is more than second temperature thresholding T2.
If current evaporating temperature is not more than second temperature thresholding T2, step 609 is performed；If current evaporating temperature is more than the
Two temperature threshold T2, then perform step 615.
Step 609, judge whether current evaporating temperature is more than the 3rd temperature threshold T3, wherein the 3rd temperature threshold is less than the
Two temperature thresholds.
If current evaporating temperature is not more than the 3rd temperature threshold T3, step 610 is performed.If current evaporating temperature is more than the
Three temperature threshold T3, then perform step 611.
Step 610, by-passing valve is opened.
Step 611, judge whether the temperature drop rate of refrigerant in evaporator is more than temperature drop rate thresholding E.
If the temperature drop rate of refrigerant is more than temperature drop rate thresholding, step 610 is performed；If the temperature drop rate of refrigerant is not more than
Temperature drop rate thresholding, then perform step 605.
Step 612, after by-passing valve is opened, judge whether current evaporating temperature is more than the 4th temperature threshold T4, wherein the
Four temperature threshold T4 are less than the 3rd temperature threshold T3.
If evaporating temperature is not more than the 4th temperature threshold T4, step 614 is performed；If current evaporating temperature is more than the 4th temperature
Thresholding T4 is spent, then performs step 613.
Step 613, judge current evaporating temperature the 4th temperature threshold T4 to the 3rd temperature threshold T3 sections it is lasting when
Between whether exceed constant temperature thresholding B.
If the duration not less than constant temperature thresholding, performs step 602；If the duration exceedes constant temperature door
Limit, then perform step 614.
Step 614, close compressor.
Step 615, judge current evaporating temperature second temperature thresholding T2 to the first temperature threshold T1 sections it is lasting when
Between whether exceed constant temperature thresholding B.
If the duration not less than constant temperature thresholding B, performs step 603；If the duration exceedes constant temperature door
B is limited, then performs step 616.
Step 616, by-passing valve is closed.
In addition, can also by the way that the pump 21 in cooling circuit 2 is set into variable frequency pump, so as to when coolant temperature is relatively low,
The frequency of pump 21 is increased, to increase the flow of cooling agent, to improve the temperature of refrigerant in evaporator.
By implementing the present invention, following beneficial effect can be obtained：
1) increase bypass branch in refrigerating circuit, and according to evaporating temperature, by with the coolant after refrigerant heat exchange
The parameter Collaborative Control such as temperature compressor frequency, bypass threshold switch, electronic expansion valve opening reduce the freezing probability of evaporator.
2) evaporator uses coaxial sleeve heat exchanger, further reduces freezing possibility.
One of ordinary skill in the art will appreciate that hardware can be passed through by realizing all or part of step of above-described embodiment
To complete, by program the hardware of correlation can also be instructed to complete, described program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
Description of the invention provides for the sake of example and description, and is not exhaustively or by the present invention
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Select and retouch
State embodiment and be to more preferably illustrate the principle and practical application of the present invention, and one of ordinary skill in the art is managed
The present invention is solved so as to design the various embodiments with various modifications suitable for special-purpose.
Claims (23)
1. a kind of antifreeze cooling system, it is characterised in that including refrigerating circuit (1) and cooling circuit (2), the refrigerating circuit
(1) bypass branch (3) is provided with, wherein：
The both ends of the bypass branch (3) respectively with the entrance of condenser (12) and the evaporator in the refrigerating circuit (1)
(14) entrance connection；
Refrigerant in the refrigerating circuit (1) carries out heat exchange with the coolant in the cooling circuit (2).
2. system according to claim 1, it is characterised in that
The bypass branch (3) is provided with by-passing valve (31).
3. system according to claim 3, it is characterised in that also including the first temperature sensor (4), wherein：
First temperature sensor (4) be used for detect by with the coolant temperature after refrigerant heat exchange.
4. system according to claim 3, it is characterised in that also including second temperature sensor (5), wherein：
The second temperature sensor (5) is used for the temperature for detecting the evaporator (14) interior refrigerant.
5. system according to claim 4, it is characterised in that also including control device, wherein：
The current coolant temperature and the second temperature that the control device detects according to first temperature sensor (4) pass
The current refrigerant temperature of sensor (5) detection, compressor in the valve opening, the refrigerating circuit (1) to the by-passing valve (31)
(11) aperture of electric expansion valve (13) is adjusted in working frequency, and/or the refrigerating circuit (1).
6. system according to claim 5, it is characterised in that
The control device at predetermined intervals, judges whether the current coolant temperature is more than preset temperature value, if
The current coolant temperature is not more than preset temperature value, then closes the compressor (11).
7. system according to claim 6, it is characterised in that
The control device judges the current refrigerant temperature in the case where the current coolant temperature is more than preset temperature value
Whether degree is more than the first temperature threshold, if the refrigerant temperature is not more than the first temperature threshold, determines whether described current
Whether duration of the refrigerant temperature in second temperature thresholding to the first temperature threshold section exceedes constant temperature thresholding, if holding
The continuous time exceedes constant temperature thresholding, then reduces the frequency of the compressor (11), wherein the first temperature threshold is more than the second temperature
Spend thresholding.
8. system according to claim 7, it is characterised in that
The control device is additionally operable to, in the case where the duration is not less than constant temperature thresholding, determine whether the evaporation
Whether the temperature drop rate of device (14) interior refrigerant is more than temperature drop rate thresholding, if the temperature drop rate of the refrigerant is more than temperature drop rate door
Limit, then increase the aperture of the electric expansion valve (13).
9. system according to claim 8, it is characterised in that
The control device is additionally operable in the case where the temperature drop rate of the refrigerant is not more than temperature drop rate thresholding, described in judgement
Whether current refrigerant temperature is more than second temperature thresholding, if the current refrigerant temperature is not more than second temperature thresholding, enters one
Step judges whether the current refrigerant temperature is more than the 3rd temperature threshold, if the current refrigerant temperature is not more than the 3rd temperature door
Limit, then open the by-passing valve (31), wherein the 3rd temperature threshold is less than second temperature thresholding.
10. system according to claim 9, it is characterised in that
The control device is additionally operable to, in the case where the current refrigerant temperature is more than the 3rd temperature threshold, determine whether institute
Whether the temperature drop rate for stating evaporator (14) interior refrigerant is more than temperature drop rate thresholding, if the temperature drop rate of the refrigerant is more than temperature drop
Rate threshold, then the by-passing valve (31) is opened, if the temperature drop rate of the refrigerant is not more than temperature drop rate thresholding, reduce institute
State the frequency of compressor (11).
11. system according to claim 9, it is characterised in that
Whether the control device judges the current refrigerant temperature more than the also further after the by-passing valve (31) is opened
Four temperature thresholds, if the refrigerant temperature is not more than the 4th temperature threshold, close compressor, wherein the 4th temperature threshold is less than
3rd temperature threshold.
12. system according to claim 11, it is characterised in that
The control device also in the case where the current refrigerant temperature is more than the 4th temperature threshold, determines whether described work as
Whether preceding refrigerant temperature exceedes constant temperature thresholding in the duration of the 4th temperature threshold to the 3rd temperature threshold, if continue
Between not less than constant temperature thresholding, then repeat the step for judging whether the current refrigerant temperature is more than the first temperature threshold
Suddenly；If the duration exceedes constant temperature thresholding, close compressor.
13. system according to claim 9, it is characterised in that
The control device is additionally operable to, in the case where the current refrigerant temperature is more than second temperature thresholding, determine whether institute
Whether the duration for stating current refrigerant temperature in second temperature thresholding to the first temperature threshold section exceedes constant temperature thresholding,
If the duration exceedes constant temperature thresholding, the by-passing valve (31) is closed.
14. according to the system any one of claim 1-13, it is characterised in that
The evaporator (14) is coaxial sleeve heat exchanger.
A kind of 15. antifreeze cooling control method, it is characterised in that including：
Detect in cooling circuit by with the coolant temperature after refrigerant heat exchange in refrigerating circuit, and evaporated in refrigerating circuit
The temperature of refrigerant in device；
According to the current coolant temperature of detection and current refrigerant temperature, valve opening, institute to the by-passing valve on bypass branch
The aperture for stating electric expansion valve in the working frequency of compressor in refrigerating circuit, and/or the refrigerating circuit is adjusted；
Wherein, the refrigerant in the refrigerating circuit carries out heat exchange with the coolant in the cooling circuit；The refrigerating circuit
In be provided with bypass branch, the both ends of the bypass branch respectively with the entrance of condenser in the refrigerating circuit and the evaporator
Entrance connection.
16. according to the method for claim 15, it is characterised in that
According to the current coolant temperature of detection and current refrigerant temperature, valve opening, institute to the by-passing valve on bypass branch
State electric expansion valve in the working frequency of compressor in refrigerating circuit, and/or the refrigerating circuit aperture be adjusted including：
At predetermined intervals, judge whether the current coolant temperature is more than preset temperature value；
If the current coolant temperature is not more than preset temperature value, the compressor is closed.
17. according to the method for claim 16, it is characterised in that
In the case where the current coolant temperature is more than preset temperature value, judge the current refrigerant temperature whether more than the
One temperature threshold；
If the refrigerant temperature is not more than the first temperature threshold, determine whether the current refrigerant temperature in second temperature door
Whether limit to the duration in the first temperature threshold section exceedes constant temperature thresholding, wherein the first temperature threshold is more than second
Temperature threshold；
If the duration exceedes constant temperature thresholding, the frequency of the compressor is reduced.
18. according to the method for claim 17, it is characterised in that
In the case where the duration is not less than constant temperature thresholding, the temperature drop rate of refrigerant in the evaporator is determined whether
Whether temperature drop rate thresholding is more than；
If the temperature drop rate of the refrigerant is more than temperature drop rate thresholding, increase the aperture of the electric expansion valve.
19. according to the method for claim 18, it is characterised in that
In the case where the temperature drop rate of the refrigerant is not more than temperature drop rate thresholding, judge whether the current refrigerant temperature is big
In second temperature thresholding；
If the current refrigerant temperature is not more than second temperature thresholding, determine whether the current refrigerant temperature is more than
3rd temperature threshold, wherein the 3rd temperature threshold is less than second temperature thresholding；
If the current refrigerant temperature is not more than the 3rd temperature threshold, the by-passing valve is opened.
20. according to the method for claim 19, it is characterised in that
In the case where the current refrigerant temperature is more than the 3rd temperature threshold, the temperature of refrigerant in the evaporator is determined whether
Whether reduction of speed rate is more than temperature drop rate thresholding；
If the temperature drop rate of the refrigerant is more than temperature drop rate thresholding, the by-passing valve is opened；
If the temperature drop rate of the refrigerant is not more than temperature drop rate thresholding, the frequency of the compressor is reduced.
21. according to the method for claim 19, it is characterised in that
After the by-passing valve is opened, judge whether the current refrigerant temperature is more than the 4th temperature threshold, wherein the 4th temperature
Thresholding is less than the 3rd temperature threshold；
If the refrigerant temperature is not more than the 4th temperature threshold, close compressor.
22. according to the method for claim 21, it is characterised in that
In the case where the current refrigerant temperature is more than the 4th temperature threshold, determine whether the current refrigerant temperature the
Whether the duration of four temperature thresholds to the 3rd temperature threshold exceedes constant temperature thresholding；
If the duration not less than constant temperature thresholding, repeats and judges whether the current refrigerant temperature is more than the first temperature
The step of spending thresholding；
If the duration exceedes constant temperature thresholding, close compressor.
23. according to the method for claim 19, it is characterised in that
In the case where the current refrigerant temperature is more than second temperature thresholding, determine whether the current refrigerant temperature the
Whether the duration of two temperature thresholds to the first temperature threshold section exceedes constant temperature thresholding；
If the duration exceedes constant temperature thresholding, the by-passing valve is closed.
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