CN108981101A - Control method and control device of electronic expansion valve and unit - Google Patents
Control method and control device of electronic expansion valve and unit Download PDFInfo
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- CN108981101A CN108981101A CN201810689042.9A CN201810689042A CN108981101A CN 108981101 A CN108981101 A CN 108981101A CN 201810689042 A CN201810689042 A CN 201810689042A CN 108981101 A CN108981101 A CN 108981101A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 29
- 239000012530 fluid Substances 0.000 claims description 12
- 230000009467 reduction Effects 0.000 claims description 9
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 3
- 230000009182 swimming Effects 0.000 claims 1
- 239000003507 refrigerant Substances 0.000 abstract description 4
- 238000011156 evaluation Methods 0.000 abstract 1
- 238000010977 unit operation Methods 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention discloses a control method and a control device of an electronic expansion valve and a unit. The control method comprises the following steps: determining the superheat degree and the heat exchange temperature difference of the unit; and adjusting the opening degree of the electronic expansion valve according to the superheat degree and the heat exchange temperature difference. According to the invention, two factors of the heat exchange characteristic and the superheat degree of the unit can be systematically considered, and after comprehensive judgment and evaluation, a proper mode for adjusting the electronic expansion valve is selected. The refrigerant flow that passes through after the regulation can make superheat degree and heat transfer difference in temperature all be in suitable scope, from this, can improve the performance and the reliability of unit operation (especially under the low temperature condition).
Description
Technical field
The present invention relates to machine set technology fields, control method, control device in particular to a kind of electric expansion valve
And a kind of unit.
Background technique
Currently, most of heat pump units are both provided with electric expansion valve, for example, air-conditioner set is controlled using electric expansion valve
The flow of refrigeration matchmaker.And the side that electric expansion valve is a kind of common control electric expansion valve is adjusted according to evaporator superheat
Formula.But when heat pump unit is run at a lower temperature, the heat that refrigerant is drawn from air is less, and it is complete to be not enough to a refrigerant
Evaporation, causes the degree of superheat of evaporator exit lower, and even zero.And electric expansion valve is adjusted according to the degree of superheat
When, the adjusting unit of the degree of superheat is 1 degree Celsius.This is resulted at low temperatures, above-mentioned adjusting electric expansion valve
Mode can make the amplitude of accommodation less than normal, make cold medium flux be unsatisfactory for unit high energy efficiency operation, reduce unit performance and can
By property.
Aiming at the problem that regulative mode of electric expansion valve in the prior art can reduce unit performance, not yet propose have at present
The solution of effect.
Summary of the invention
Control method, control device and a kind of unit of a kind of electric expansion valve are provided in the embodiment of the present invention, to solve
The regulative mode of electric expansion valve can reduce the problem of unit performance in the prior art.
In order to solve the above technical problems, in a first aspect, the present invention provides a kind of control method of electric expansion valve, it is described
Method includes:
Determine the degree of superheat and heat transfer temperature difference of unit；
The aperture of electric expansion valve is adjusted according to the degree of superheat and the heat transfer temperature difference.
Further, it is determined that the degree of superheat and heat transfer temperature difference of unit, comprising:
Suction temperature and pressure of inspiration(Pi) saturation temperature are obtained, according to the suction temperature and the pressure of inspiration(Pi) saturation temperature
Determine the degree of superheat of unit；Alternatively, suction temperature and defrost tube temperature degree are obtained, according to the suction temperature and the defrost tube temperature
Spend the degree of superheat for determining unit；And
Obtain tracheae temperature, liquid pipe temperature, leaving water temperature, inflow temperature；According to the tracheae temperature, the liquid pipe temperature
Degree, the leaving water temperature, the inflow temperature determine the heat transfer temperature difference of unit.
Further, the degree of superheat that unit is determined according to the suction temperature and the pressure of inspiration(Pi) saturation temperature, passes through
Following formula is realized:
The degree of superheat=suction temperature-pressure of inspiration(Pi) saturation temperature.
Further, the degree of superheat that unit is determined according to the suction temperature and the defrost tube temperature degree, passes through following public affairs
Formula is realized:
The degree of superheat=suction temperature-defrost tube temperature degree.
Further, it is determined according to the tracheae temperature, the liquid pipe temperature, the leaving water temperature, the inflow temperature
Heat transfer temperature difference is realized by following formula:
Further, include: according to the aperture that the degree of superheat and the heat transfer temperature difference adjust electric expansion valve
The size relation for comparing the degree of superheat and the first preset threshold or the first pre-set interval, obtains the first result；With
And
The size relation for comparing the heat transfer temperature difference and the second preset threshold or the second pre-set interval obtains the second result；
The aperture of the electric expansion valve is adjusted according to first result and second result.
Further, include: according to the aperture that first result and second result adjust the electric expansion valve
If described first the result is that: the degree of superheat be greater than first preset threshold, alternatively, the degree of superheat is greater than
The right end point value of first pre-set interval；Described second the result is that: the heat transfer temperature difference be less than second preset threshold, or
Person, the heat transfer temperature difference are less than the left end point value of second pre-set interval；The aperture of the electric expansion valve is then controlled with institute
It states the increase of the degree of superheat and increases；
If described first the result is that: the degree of superheat be less than or equal to first preset threshold, alternatively, the overheat
Degree is located at the left end point value in first pre-set interval or less than first pre-set interval；Described second the result is that: it is described
Heat transfer temperature difference is less than second preset threshold, alternatively, the heat transfer temperature difference is less than the left end point value of second pre-set interval；
The aperture for then controlling the electric expansion valve is constant；
If described first the result is that: the degree of superheat be greater than first preset threshold, alternatively, the degree of superheat is greater than
The right end point value of first pre-set interval；Described second the result is that: the heat transfer temperature difference be equal to the second threshold, alternatively,
The heat transfer temperature difference is located in second pre-set interval, then controls the aperture of the electric expansion valve with the increasing of the degree of superheat
Increase greatly；
If described first the result is that: the degree of superheat be less than or equal to first preset threshold, alternatively, the overheat
Degree is located at the left end point value in first pre-set interval or less than first pre-set interval；Described second the result is that: it is described
Heat transfer temperature difference is equal to second preset threshold and then controls institute alternatively, the heat transfer temperature difference is located in second pre-set interval
The aperture for stating electric expansion valve is constant；
If described first the result is that: the degree of superheat be greater than first preset threshold, alternatively, the degree of superheat is greater than
The right end point value of first pre-set interval；Described second the result is that: the heat transfer temperature difference be greater than the second threshold, alternatively,
The heat transfer temperature difference is greater than the right end point value of second pre-set interval, then the aperture for controlling the electric expansion valve is constant；
If described first the result is that: the degree of superheat be equal to first preset threshold, alternatively, the degree of superheat is located at
In first pre-set interval；Described second the result is that: the heat transfer temperature difference be greater than second preset threshold, alternatively, described
Heat transfer temperature difference is greater than the right end point value of second pre-set interval, then controls the aperture of the electric expansion valve with the heat exchange temperature
Difference reduction and reduce；
If described first the result is that: the degree of superheat be less than first preset threshold, alternatively, the degree of superheat is less than
The left end point value of first pre-set interval；Described second the result is that: the heat transfer temperature difference be greater than second preset threshold, or
Person, the heat transfer temperature difference are greater than the right end point value of second pre-set interval, then control the aperture of the electric expansion valve with institute
It states the reduction of the degree of superheat and reduces.
Second aspect, the embodiment of the present invention also provide a kind of unit, and the unit is for executing side described in first aspect
Method, the unit include: mainboard and electric expansion valve；
The mainboard is connect with the electric expansion valve, for determining the degree of superheat and heat transfer temperature difference of unit；According to described
The degree of superheat and the heat transfer temperature difference adjust the aperture of electric expansion valve.
Further, the unit further include: air-breathing temperature sensing package, low pressure sensor, defrost temperature sensing package, tracheae and tracheae sense
Thermometer bulb, water outlet temperature sensing package, liquid pipe and liquid pipe temperature sensing package and water inlet temperature sensing package,
The air-breathing temperature sensing package is connect with the low pressure sensor；
The low pressure sensor, for detecting pressure of inspiration(Pi), wherein the pressure of inspiration(Pi) is for determining that pressure of inspiration(Pi) is saturated
Temperature；
The mainboard, with the air-breathing temperature sensing package, low pressure sensor, tracheae temperature sensing package, water outlet temperature sensing package, liquid pipe temperature sensing package
And water inlet temperature sensing package is separately connected, for determining the degree of superheat according to suction temperature and the pressure of inspiration(Pi) saturation temperature；
Alternatively, determining the degree of superheat according to the suction temperature and defrost tube temperature degree；
And heat transfer temperature difference is determined according to tracheae temperature, leaving water temperature, liquid pipe temperature and inflow temperature.
Further, the mainboard is also used to the degree of superheat described in comparison and the first preset threshold or the first pre-set interval
Size relation obtains the first result；And the size of the heat transfer temperature difference and the second preset threshold or the second pre-set interval
Relationship obtains the second result；The aperture of the electric expansion valve is adjusted according to first result and second result.
Further, the unit further include:
Four-way valve, evaporator, high pressure sensor, high-voltage switch gear, compressor, low tension switch, vapour point,
The S hydraulic fluid port of the four-way valve is connected to the air-breathing temperature sensing package, C hydraulic fluid port is connected to the evaporator, the connection of D hydraulic fluid port
In the high pressure sensor, E hydraulic fluid port is connected to the tracheae；
The evaporator is connected to the defrost temperature sensing package；
The electric expansion valve is between the defrost temperature sensing package and the liquid pipe；
The high pressure sensor, the high-voltage switch gear, the compressor, the low tension switch, the vapour point and described
Low pressure sensor is successively linked in sequence.
The third aspect, the embodiment of the present invention also provide a kind of control device of electric expansion valve, and described device is for executing
Method described in first aspect, described device include:
Determining module, for determining the degree of superheat and heat transfer temperature difference of unit；
Adjustment module, for adjusting the aperture of electric expansion valve according to the degree of superheat and the heat transfer temperature difference.
Further, the determining module is also used to obtain suction temperature and pressure of inspiration(Pi) saturation temperature, according to the suction
Temperature degree and the pressure of inspiration(Pi) saturation temperature determine the degree of superheat of unit；Alternatively, obtaining suction temperature and defrost tube temperature degree, root
The degree of superheat of unit is determined according to the suction temperature and the defrost tube temperature degree；And it obtains tracheae temperature, liquid pipe temperature, go out
Coolant-temperature gage, inflow temperature；Machine is determined according to the tracheae temperature, the liquid pipe temperature, the leaving water temperature, the inflow temperature
The heat transfer temperature difference of group.
Further, the adjustment module is also used to the degree of superheat described in comparison and the first preset threshold or the first preset areas
Between size relation, obtain the first result；And the heat transfer temperature difference and the second preset threshold or the second pre-set interval
Size relation obtains the second result；The aperture of the electric expansion valve is adjusted according to first result and second result.
It applies the technical scheme of the present invention, the aperture of electric expansion valve is adjusted according to the degree of superheat and heat transfer temperature difference.With only
Consider that this factor of the degree of superheat is compared, can systematically assess two kinds of factors of heat transfer characteristic and the degree of superheat of unit, comprehensive descision
Afterwards, the suitable mode for adjusting electric expansion valve of selection, the cold medium flux after adjusting enable to the degree of superheat and heat transfer temperature difference
It is in suitable range, Performance And Reliability (especially at low temperatures) when unit is run can be improved as a result,.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the control method of electric expansion valve according to an embodiment of the present invention；
Fig. 2 is a kind of flow chart of the control method of electric expansion valve according to an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of unit according to an embodiment of the present invention；
Fig. 4 is a kind of structural block diagram of the control device of electric expansion valve according to an embodiment of the present invention.
Specific embodiment
Present invention is further described in detail in the following with reference to the drawings and specific embodiments, it should be understood that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
In subsequent description, it is only using the suffix for indicating such as " module ", " component " or " unit " of element
Be conducive to explanation of the invention, itself there is no a specific meaning.Therefore, " module ", " component " or " unit " can mix
Ground uses.
In order to solve the problems, such as that the regulative mode of electric expansion valve in the related technology can reduce unit performance, the present invention is implemented
Example provides a kind of control method of electric expansion valve, as shown in Figure 1, method includes:
Step S101, the degree of superheat and heat transfer temperature difference of unit are determined；
Step S102, the aperture of electric expansion valve is adjusted according to the degree of superheat and heat transfer temperature difference.
The aperture of electric expansion valve is adjusted according to the degree of superheat and heat transfer temperature difference.With only consideration this factor phase of the degree of superheat
Than can systematically assess two kinds of factors of heat transfer characteristic and the degree of superheat of unit, after comprehensive descision, select suitable to adjust electronics
The mode of expansion valve, the cold medium flux after adjusting enable to the degree of superheat and heat transfer temperature difference to be in suitable range, by
This, can be improved Performance And Reliability (especially at low temperatures) when unit is run.
In one possible implementation, heat transfer temperature difference can be the heat transfer temperature difference of water and refrigerant in water chiller.Step
Rapid S101 determines the degree of superheat of unit and heat transfer temperature difference may include: to obtain suction temperature and pressure of inspiration(Pi) saturation temperature, according to
Suction temperature and pressure of inspiration(Pi) saturation temperature determine the degree of superheat of unit；Alternatively, suction temperature and defrost tube temperature degree are obtained, according to
Suction temperature and defrost tube temperature degree determine the degree of superheat of unit；And obtain tracheae temperature, liquid pipe temperature, leaving water temperature, water inlet
Temperature；The heat transfer temperature difference of unit is determined according to tracheae temperature, liquid pipe temperature, leaving water temperature, inflow temperature.
Generally, by the available above-mentioned parameter of related component of unit, and can be according to " the degree of superheat=air-breathing
Temperature-pressure of inspiration(Pi) saturation temperature " or " degree of superheat=suction temperature-defrost tube temperature degree " determine the degree of superheat of unit.According to
Following formula acquire the heat transfer temperature difference of unit.
When unit does not detect the device of pressure of inspiration(Pi) for example: when low pressure sensor, then it is approximate that defrost tube temperature degree can be used
Instead of the evaporating temperature (i.e. pressure of inspiration(Pi) saturation temperature) of evaporator.The diversity for obtaining degree of superheat mode can be increased as a result,.But
Pressure of inspiration(Pi) is determined with using low pressure sensor, and then calculates pressure of inspiration(Pi) saturation temperature, and substitute into the degree of superheat that formula acquires
It compares, such mode temperature feedback more lags, and the degree of superheat of calculating may be inaccurate, so as to the tune of electric expansion valve
Section is not suitable for.Therefore, in conditions permit, it is proposed that calculated by the way of directly acquiring pressure of inspiration(Pi) saturation temperature
Temperature.
In one possible implementation, as shown in Fig. 2, step S102, being adjusted according to the degree of superheat and heat transfer temperature difference
The aperture of electric expansion valve includes:
Step S201, the size relation for comparing the degree of superheat and the first preset threshold or the first pre-set interval, obtains the first knot
Fruit；And
Step S202, the size relation for comparing heat transfer temperature difference and the second preset threshold or the second pre-set interval, obtains second
As a result；
Step S203, the aperture of electric expansion valve is adjusted according to the first result and the second result.
It is during heat pump unit actual motion, the degree of superheat and heat transfer temperature difference control is relatively difficult to achieve in certain certain value,
Control is then more conform with actual conditions within a certain range, and the embodiment of the present invention has comprehensively considered reality factor and error component.
Using mode shown in Fig. 2 come threshold value and pre-set interval, and by the degree of superheat, heat transfer temperature difference respectively with mutual threshold value and
Pre-set interval is compared, and adjusts electric expansion valve according to comparison result.Wherein, preset threshold and pre-set interval can bases
The self performance of demand and electric expansion valve of the user to unit performance is set.It is understood that using preset areas
Between the adjusting to electric expansion valve can be made more stable as the reference point of the degree of superheat or heat transfer temperature difference, further improving can
By property.And two ways can be with cross-reference.For example, by the degree of superheat compared with preset threshold, by heat transfer temperature difference and pre-set interval
It compares, obtains the first comparison result and the second comparison result.The present invention is without limitation.
In one possible implementation, the aperture packet of electric expansion valve is adjusted according to the first result and the second result
Include: if first the result is that: the degree of superheat be greater than the first preset threshold, alternatively, the degree of superheat be greater than the first pre-set interval right endpoint
Value；Second the result is that: heat transfer temperature difference is less than the second preset threshold, alternatively, left end point of the heat transfer temperature difference less than the second pre-set interval
Value；The aperture for then controlling electric expansion valve increases with the increase of the degree of superheat；
If first the result is that: the degree of superheat be less than or equal to the first preset threshold, alternatively, the degree of superheat is located at the first preset areas
Left end point value interior or less than the first pre-set interval；Second the result is that: heat transfer temperature difference is less than the second preset threshold, alternatively, changing
Left end point value of the hot temperature difference less than the second pre-set interval；The aperture for then controlling electric expansion valve is constant；
If first the result is that: the degree of superheat be greater than the first preset threshold, alternatively,
The degree of superheat is greater than the right end point value of the first pre-set interval；Second the result is that: heat transfer temperature difference be equal to second threshold, or
Person, heat transfer temperature difference are located in the second pre-set interval, then the aperture for controlling electric expansion valve increases with the increase of the degree of superheat；
If first the result is that: the degree of superheat be less than or equal to the first preset threshold, alternatively, the degree of superheat is located at the first preset areas
Left end point value interior or less than the first pre-set interval；Second the result is that: heat transfer temperature difference be equal to the second preset threshold, alternatively, changing
The hot temperature difference is located in the second pre-set interval, then the aperture for controlling electric expansion valve is constant；
If first the result is that: the degree of superheat be greater than the first preset threshold, alternatively, the degree of superheat be greater than the first pre-set interval the right side
Endpoint value；Second the result is that: heat transfer temperature difference be greater than second threshold, alternatively, heat transfer temperature difference be greater than the second pre-set interval right endpoint
Value, the then aperture for controlling electric expansion valve are constant；
If first the result is that: the degree of superheat be equal to the first preset threshold, alternatively, the degree of superheat is located in the first pre-set interval；
Second the result is that: heat transfer temperature difference be greater than the second preset threshold, alternatively, heat transfer temperature difference be greater than the second pre-set interval right end point value,
The aperture for then controlling electric expansion valve reduces with the reduction of heat transfer temperature difference；
If first the result is that: the degree of superheat is less than the first preset threshold, alternatively, a left side of the degree of superheat less than the first pre-set interval
Endpoint value；Second the result is that: heat transfer temperature difference be greater than the second preset threshold, alternatively, heat transfer temperature difference be greater than the second pre-set interval the right side
Endpoint value, the then aperture for controlling electric expansion valve reduce with the reduction of the degree of superheat.
Table can be used to be described further above-mentioned implementation.In table 1, the reference standard of the degree of superheat is first default
Threshold value, the reference standard of heat transfer temperature difference are the second preset threshold.In table 2, the reference standard of the degree of superheat is the first pre-set interval, is changed
The reference standard of the hot temperature difference is the second pre-set interval.And Δ t2 represents the degree of superheat；δ represents the first preset threshold；Δ t1 representative is changed
The hot temperature difference, ε represent the second preset threshold；[A, B] represents the first pre-set interval；[α, β] represents the second pre-set interval, and EXV generation
Table electric expansion valve.
Table 1
| Δt1< ε | Δt1=ε | Δt1> ε | |
| Δt2> δ | It opens greatly, is adjusted by the degree of superheat | It opens greatly, is adjusted by the degree of superheat | EXV is not adjusted |
| Δt2=δ | EXV is not adjusted | EXV is not adjusted | It turns down, is adjusted by heat transfer temperature difference |
| Δt2< δ | EXV is not adjusted | EXV is not adjusted | It turns down, is controlled by the degree of superheat |
Table 2
| Δt1< α | Δt1=[α, β] | Δt1> β | |
| Δt2> B | It opens greatly, is adjusted by the degree of superheat | It opens greatly, is adjusted by the degree of superheat | EXV is not adjusted |
| Δt2=[A, B] | EXV is not adjusted | EXV is not adjusted | It turns down, is adjusted by heat transfer temperature difference |
| Δt2< A | EXV is not adjusted | EXV is not adjusted | It turns down, is controlled by the degree of superheat |
It should be noted that heat transfer temperature difference is smaller, the performance of unit is higher, and is carried out based on the degree of superheat to electric expansion valve
Adjust it is higher than the priority that electric expansion valve is adjusted based on heat transfer temperature difference, be exemplified by Table 1, when unit heat transfer temperature difference not
Greater than the second preset threshold and when the degree of superheat is not more than the first preset threshold, the operating condition of unit is normal, i.e. electric expansion valve
Aperture caused by flow through the cold medium flux of unit and unit performance and can maintain the state of a stable equilibrium, then do not need
Electric expansion valve is adjusted.But if heat transfer temperature difference remains unchanged, the degree of superheat raises to above the first preset threshold, then controls
Electric expansion valve processed is opened greatly according to the raising of the degree of superheat.If heat transfer temperature difference is greater than the second preset threshold, and the degree of superheat at this time
Equal to the first preset threshold, illustrate that the degree of superheat is relatively stable, then controls electric expansion valve and turned down according to the reduction of heat transfer temperature difference.
If heat transfer temperature difference is greater than the second preset threshold, and the degree of superheat is less than the first preset threshold, that is to say, that the two is unstable
Under state, then according to above-mentioned priority, controls electric expansion valve and turned down according to the reduction of the degree of superheat.
The aperture of electric expansion valve is adjusted according to the degree of superheat and heat transfer temperature difference as a result,.With only consider the degree of superheat this because
Element is compared, and can systematically assess two kinds of factors of heat transfer characteristic and the degree of superheat of unit, after comprehensive descision, selects suitable adjust
The mode of electric expansion valve, the cold medium flux after adjusting enable to the degree of superheat and heat transfer temperature difference to be in suitable range
It is interior, Performance And Reliability (especially at low temperatures) when unit is run can be improved as a result,.
Fig. 3 shows a kind of unit, and for unit for executing method shown in above-described embodiment, unit includes: mainboard (in figure
It is not shown) and electric expansion valve 1；
Mainboard is connect with electric expansion valve 1, for determining the degree of superheat and heat transfer temperature difference of unit；According to the degree of superheat and change
The hot temperature difference adjusts the aperture of electric expansion valve 1.
In one possible implementation, unit further include: air-breathing temperature sensing package 2, low pressure sensor 3, defrost temperature sensing package
4, tracheae and tracheae temperature sensing package 5, water outlet temperature sensing package 6, liquid pipe and liquid pipe temperature sensing package 7 and water inlet temperature sensing package 8,
Air-breathing temperature sensing package 2 is connect with low pressure sensor 3；
Low pressure sensor 3, for detecting pressure of inspiration(Pi), wherein pressure of inspiration(Pi) is for determining pressure of inspiration(Pi) saturation temperature；
Mainboard, with air-breathing temperature sensing package 2, low pressure sensor 3, tracheae temperature sensing package 5, water outlet temperature sensing package 6, liquid pipe temperature sensing package 7 and
Water inlet temperature sensing package 8 is separately connected, for determining the degree of superheat according to suction temperature and pressure of inspiration(Pi) saturation temperature；Alternatively, according to
Suction temperature and defrost tube temperature degree determine the degree of superheat；And according to tracheae temperature, leaving water temperature, liquid pipe temperature and water inlet temperature
It spends and determines heat transfer temperature difference.
In one possible implementation, mainboard, is also used to compare the degree of superheat and the first preset threshold or first are default
The size relation in section obtains the first result；And compare the big of heat transfer temperature difference and the second preset threshold or the second pre-set interval
Small relationship obtains the second result；The aperture of electric expansion valve 1 is adjusted according to the first result and the second result.
In one possible implementation, unit further include: four-way valve 9, evaporator 10, high pressure sensor 11, high pressure
Switch 12, compressor 13, low tension switch 14, vapour divide 15,
The S hydraulic fluid port of four-way valve 9 is connected to air-breathing temperature sensing package 2, C hydraulic fluid port is connected to evaporator 10, D hydraulic fluid port is connected to high pressure biography
Sensor 11, E hydraulic fluid port are connected to tracheae 5；
Evaporator 10 is connected to defrost temperature sensing package 4；
Electric expansion valve 1 is between defrost temperature sensing package 4 and liquid pipe 7；
High pressure sensor 11, high-voltage switch gear 12, compressor 13, low tension switch 14, vapour points 15 and low pressure sensor 3 are successively
It is linked in sequence.
The aperture of electric expansion valve is adjusted according to the degree of superheat and heat transfer temperature difference.With only consideration this factor phase of the degree of superheat
Than can systematically assess two kinds of factors of heat transfer characteristic and the degree of superheat of unit, after comprehensive descision, select suitable to adjust electronics
The mode of expansion valve, the cold medium flux after adjusting enable to the degree of superheat and heat transfer temperature difference to be in suitable range, by
This, can be improved Performance And Reliability (especially at low temperatures) when unit is run.
Fig. 4 shows a kind of control device of electric expansion valve, which, should for executing method shown in fig. 1 or fig. 2
Device includes:
Determining module 401, for determining the degree of superheat and heat transfer temperature difference of unit；
Adjustment module 402, for adjusting the aperture of electric expansion valve according to the degree of superheat and heat transfer temperature difference.
In one possible implementation, determining module 401 are also used to obtain suction temperature and pressure of inspiration(Pi) saturation temperature
Degree, the degree of superheat of unit is determined according to suction temperature and pressure of inspiration(Pi) saturation temperature；Alternatively, obtaining suction temperature and defrost tube temperature
Degree, the degree of superheat of unit is determined according to suction temperature and defrost tube temperature degree；And it obtains tracheae temperature, liquid pipe temperature, go out water temperature
Degree, inflow temperature；The heat transfer temperature difference of unit is determined according to tracheae temperature, liquid pipe temperature, leaving water temperature, inflow temperature.
In one possible implementation, adjustment module 402 are also used to compare the degree of superheat and the first preset threshold or the
The size relation of one pre-set interval obtains the first result；And compare heat transfer temperature difference and the second preset threshold or the second preset areas
Between size relation, obtain the second result；The aperture of electric expansion valve is adjusted according to the first result and the second result.
In one possible implementation, adjustment module 402, if be also used to first the result is that: the degree of superheat is greater than the
One preset threshold, alternatively, the degree of superheat is greater than the right end point value of the first pre-set interval；Second the result is that: heat transfer temperature difference is less than second
Preset threshold, alternatively, left end point value of the heat transfer temperature difference less than the second pre-set interval；The aperture of electric expansion valve is then controlled with overheat
The increase of degree and increase；If first the result is that: the degree of superheat is less than or equal to the first preset threshold, alternatively, the degree of superheat is located at the
Left end point value in one pre-set interval or less than the first pre-set interval；Second the result is that: heat transfer temperature difference less than the second preset threshold,
Alternatively, left end point value of the heat transfer temperature difference less than the second pre-set interval；The aperture for then controlling electric expansion valve is constant；If the first knot
Fruit is: the degree of superheat is greater than the first preset threshold, alternatively, the degree of superheat is greater than the right end point value of the first pre-set interval；Second the result is that:
Heat transfer temperature difference is equal to second threshold, alternatively, heat transfer temperature difference is located in the second pre-set interval, then control the aperture of electric expansion valve with
The increase of the degree of superheat and increase；If first the result is that: the degree of superheat be less than or equal to the first preset threshold, alternatively, degree of superheat position
In the left end point value in the first pre-set interval or less than the first pre-set interval；Second the result is that: it is default that heat transfer temperature difference is equal to second
Threshold value, alternatively, heat transfer temperature difference is located in the second pre-set interval, then the aperture for controlling electric expansion valve is constant；If the first result
Be: the degree of superheat is greater than the first preset threshold, alternatively, the degree of superheat is greater than the right end point value of the first pre-set interval；Second the result is that: change
The hot temperature difference is greater than second threshold, alternatively, heat transfer temperature difference is greater than the right end point value of the second pre-set interval, then controls electric expansion valve
Aperture is constant；If first the result is that: the degree of superheat be equal to the first preset threshold, alternatively, the degree of superheat is located in the first pre-set interval；
Second the result is that: heat transfer temperature difference be greater than the second preset threshold, alternatively, heat transfer temperature difference be greater than the second pre-set interval right end point value,
The aperture for then controlling electric expansion valve reduces with the reduction of heat transfer temperature difference；If first the result is that: the degree of superheat is pre- less than first
If threshold value, alternatively, left end point value of the degree of superheat less than the first pre-set interval；Second the result is that: it is default that heat transfer temperature difference is greater than second
Threshold value then controls the aperture of electric expansion valve with the degree of superheat alternatively, heat transfer temperature difference is greater than the right end point value of the second pre-set interval
Reduce and reduces.
The aperture of electric expansion valve is adjusted according to the degree of superheat and heat transfer temperature difference.With only consideration this factor phase of the degree of superheat
Than can systematically assess two kinds of factors of heat transfer characteristic and the degree of superheat of unit, after comprehensive descision, select suitable to adjust electronics
The mode of expansion valve, the cold medium flux after adjusting enable to the degree of superheat and heat transfer temperature difference to be in suitable range, by
This, can be improved Performance And Reliability (especially at low temperatures) when unit is run.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a mobile terminal (can be mobile phone, computer, clothes
Business device, air conditioner or the network equipment etc.) execute method described in each embodiment of the present invention.
The embodiment of the present invention is described above in conjunction with figure, but the invention is not limited to above-mentioned specific realities
Mode is applied, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art exist
Under enlightenment of the invention, without breaking away from the scope protected by the purposes and claims of the present invention, many shapes can be also made
Formula, all of these belong to the protection of the present invention.
Claims (15)
1. a kind of control method of electric expansion valve, which is characterized in that the described method includes:
Determine the degree of superheat and heat transfer temperature difference of unit；
The aperture of electric expansion valve is adjusted according to the degree of superheat and the heat transfer temperature difference.
2. the method according to claim 1, wherein determining the degree of superheat and heat transfer temperature difference of unit, comprising:
Suction temperature and pressure of inspiration(Pi) saturation temperature are obtained, is determined according to the suction temperature and the pressure of inspiration(Pi) saturation temperature
The degree of superheat of unit；Alternatively, suction temperature and defrost tube temperature degree are obtained, it is true according to the suction temperature and the defrost tube temperature degree
Determine the degree of superheat of unit；
And
Obtain tracheae temperature, liquid pipe temperature, leaving water temperature, inflow temperature；According to the tracheae temperature, the liquid pipe temperature, institute
State leaving water temperature, the inflow temperature determines the heat transfer temperature difference of unit.
3. according to the method described in claim 2, it is characterized in that, being saturated temperature according to the suction temperature and the pressure of inspiration(Pi)
The degree of superheat for determining unit is spent, is realized by following formula:
The degree of superheat=suction temperature-pressure of inspiration(Pi) saturation temperature.
4. according to the method described in claim 2, it is characterized in that, being determined according to the suction temperature and the defrost tube temperature degree
The degree of superheat of unit, is realized by following formula:
The degree of superheat=suction temperature-defrost tube temperature degree.
5. according to the method described in claim 2, it is characterized in that, according to the tracheae temperature, the liquid pipe temperature, it is described go out
Coolant-temperature gage, the inflow temperature determine heat transfer temperature difference, are realized by following formula:
6. the method according to claim 1, wherein adjusting electricity according to the degree of superheat and the heat transfer temperature difference
The aperture of sub- expansion valve includes:
The size relation for comparing the degree of superheat and the first preset threshold or the first pre-set interval, obtains the first result；And
The size relation for comparing the heat transfer temperature difference and the second preset threshold or the second pre-set interval obtains the second result；
The aperture of the electric expansion valve is adjusted according to first result and second result.
7. according to the method described in claim 6, it is characterized in that, adjusting institute according to first result and second result
The aperture for stating electric expansion valve includes:
If described first the result is that: the degree of superheat is greater than first preset threshold, alternatively, the degree of superheat be greater than it is described
The right end point value of first pre-set interval；Described second the result is that: the heat transfer temperature difference be less than second preset threshold, alternatively,
The heat transfer temperature difference is less than the left end point value of second pre-set interval；The aperture of the electric expansion valve is then controlled with the mistake
The increase of temperature and increase；
If described first the result is that: the degree of superheat be less than or equal to first preset threshold, alternatively, the degree of superheat position
In the left end point value in first pre-set interval or less than first pre-set interval；Described second the result is that: the heat exchange
The temperature difference is less than second preset threshold, alternatively, the heat transfer temperature difference is less than the left end point value of second pre-set interval；Then control
The aperture for making the electric expansion valve is constant；
If described first the result is that: the degree of superheat is greater than first preset threshold, alternatively, the degree of superheat be greater than it is described
The right end point value of first pre-set interval；Described second the result is that: the heat transfer temperature difference be equal to the second threshold, alternatively, described
Heat transfer temperature difference is located in second pre-set interval, then control the aperture of the electric expansion valve with the increase of the degree of superheat and
Increase；
If described first the result is that: the degree of superheat be less than or equal to first preset threshold, alternatively, the degree of superheat position
In the left end point value in first pre-set interval or less than first pre-set interval；Described second the result is that: the heat exchange
The temperature difference is equal to second preset threshold and then controls the electricity alternatively, the heat transfer temperature difference is located in second pre-set interval
The aperture of sub- expansion valve is constant；
If described first the result is that: the degree of superheat is greater than first preset threshold, alternatively, the degree of superheat be greater than it is described
The right end point value of first pre-set interval；Described second the result is that: the heat transfer temperature difference be greater than the second threshold, alternatively, described
Heat transfer temperature difference is greater than the right end point value of second pre-set interval, then the aperture for controlling the electric expansion valve is constant；
If described first the result is that: the degree of superheat is equal to first preset threshold, alternatively, the degree of superheat be located at it is described
In first pre-set interval；Described second the result is that: the heat transfer temperature difference be greater than second preset threshold, alternatively, the heat exchange
The temperature difference is greater than the right end point value of second pre-set interval, then controls the aperture of the electric expansion valve with the heat transfer temperature difference
Reduce and reduces；
If described first the result is that: the degree of superheat is less than first preset threshold, alternatively, the degree of superheat be less than it is described
The left end point value of first pre-set interval；Described second the result is that: the heat transfer temperature difference be greater than second preset threshold, alternatively,
The heat transfer temperature difference is greater than the right end point value of second pre-set interval, then controls the aperture of the electric expansion valve with the mistake
The reduction of temperature and reduce.
8. a kind of unit, which is characterized in that the unit is for method described in any one of right of execution 1 to power 7, the machine
Group includes: mainboard and electric expansion valve；
The mainboard is connect with the electric expansion valve, for determining the degree of superheat and heat transfer temperature difference of unit；According to the overheat
Degree and the heat transfer temperature difference adjust the aperture of electric expansion valve.
9. unit according to claim 8, which is characterized in that the unit further include: air-breathing temperature sensing package, low pressure sensing
Device, defrost temperature sensing package, tracheae and tracheae temperature sensing package, water outlet temperature sensing package, liquid pipe and liquid pipe temperature sensing package and water inlet temperature sensing package,
The air-breathing temperature sensing package is connect with the low pressure sensor；
The low pressure sensor, for detecting pressure of inspiration(Pi), wherein the pressure of inspiration(Pi) is for determining pressure of inspiration(Pi) saturation temperature
Degree；
The mainboard, with the air-breathing temperature sensing package, low pressure sensor, tracheae temperature sensing package, water outlet temperature sensing package, liquid pipe temperature sensing package and into
Talent for swimming thermometer bulb is separately connected, for determining the degree of superheat according to suction temperature and the pressure of inspiration(Pi) saturation temperature；Alternatively,
The degree of superheat is determined according to the suction temperature and defrost tube temperature degree；
And heat transfer temperature difference is determined according to tracheae temperature, leaving water temperature, liquid pipe temperature and inflow temperature.
10. unit according to claim 8, which is characterized in that
The mainboard is also used to the size relation of the degree of superheat described in comparison and the first preset threshold or the first pre-set interval, obtains
First result；And the size relation of the heat transfer temperature difference and the second preset threshold or the second pre-set interval, obtain second
As a result；The aperture of the electric expansion valve is adjusted according to first result and second result.
11. unit according to claim 8, which is characterized in that the unit further include:
Four-way valve, evaporator, high pressure sensor, high-voltage switch gear, compressor, low tension switch, vapour point,
The S hydraulic fluid port of the four-way valve is connected to the air-breathing temperature sensing package, C hydraulic fluid port is connected to the evaporator, D hydraulic fluid port is connected to institute
High pressure sensor is stated, E hydraulic fluid port is connected to the tracheae；
The evaporator is connected to the defrost temperature sensing package；
The electric expansion valve is between the defrost temperature sensing package and the liquid pipe；
The high pressure sensor, the high-voltage switch gear, the compressor, the low tension switch, the vapour divides and the low pressure
Sensor is successively linked in sequence.
12. a kind of control device of electric expansion valve, which is characterized in that described device is for described in 1 to 7 any one of right of execution
Method, described device includes:
Determining module, for determining the degree of superheat and heat transfer temperature difference of unit；
Adjustment module, for adjusting the aperture of electric expansion valve according to the degree of superheat and the heat transfer temperature difference.
13. device according to claim 12, which is characterized in that
The determining module is also used to obtain suction temperature and pressure of inspiration(Pi) saturation temperature, according to the suction temperature and described
Pressure of inspiration(Pi) saturation temperature determines the degree of superheat of unit；Alternatively, suction temperature and defrost tube temperature degree are obtained, according to the air-breathing temperature
Degree and the defrost tube temperature degree determine the degree of superheat of unit；
And
Obtain tracheae temperature, liquid pipe temperature, leaving water temperature, inflow temperature；According to the tracheae temperature, the liquid pipe temperature, institute
State leaving water temperature, the inflow temperature determines the heat transfer temperature difference of unit.
14. device according to claim 12, which is characterized in that
The adjustment module is also used to the size relation of the degree of superheat described in comparison and the first preset threshold or the first pre-set interval,
Obtain the first result；And the size relation of the heat transfer temperature difference and the second preset threshold or the second pre-set interval, it obtains
Second result；The aperture of the electric expansion valve is adjusted according to first result and second result.
15. device according to claim 14, which is characterized in that
The adjustment module, if be also used to described first the result is that: the degree of superheat be greater than first preset threshold, or
Person, the degree of superheat are greater than the right end point value of first pre-set interval；Described second the result is that: the heat transfer temperature difference be less than institute
The second preset threshold is stated, alternatively, the heat transfer temperature difference is less than the left end point value of second pre-set interval；Then control the electronics
The aperture of expansion valve increases with the increase of the degree of superheat；
If described first the result is that: the degree of superheat be less than or equal to first preset threshold, alternatively, the degree of superheat position
In the left end point value in first pre-set interval or less than first pre-set interval；Described second the result is that: the heat exchange
The temperature difference is less than second preset threshold, alternatively, the heat transfer temperature difference is less than the left end point value of second pre-set interval；Then control
The aperture for making the electric expansion valve is constant；
If described first the result is that: the degree of superheat is greater than first preset threshold, alternatively, the degree of superheat be greater than it is described
The right end point value of first pre-set interval；Described second the result is that: the heat transfer temperature difference be equal to the second threshold, alternatively, described
Heat transfer temperature difference is located in second pre-set interval, then control the aperture of the electric expansion valve with the increase of the degree of superheat and
Increase；
If described first the result is that: the degree of superheat be less than or equal to first preset threshold, alternatively, the degree of superheat position
In the left end point value in first pre-set interval or less than first pre-set interval；Described second the result is that: the heat exchange
The temperature difference is equal to second preset threshold and then controls the electricity alternatively, the heat transfer temperature difference is located in second pre-set interval
The aperture of sub- expansion valve is constant；
If described first the result is that: the degree of superheat is greater than first preset threshold, alternatively, the degree of superheat be greater than it is described
The right end point value of first pre-set interval；Described second the result is that: the heat transfer temperature difference be greater than the second threshold, alternatively, described
Heat transfer temperature difference is greater than the right end point value of second pre-set interval, then the aperture for controlling the electric expansion valve is constant；
If described first the result is that: the degree of superheat is equal to first preset threshold, alternatively, the degree of superheat be located at it is described
In first pre-set interval；Described second the result is that: the heat transfer temperature difference be greater than second preset threshold, alternatively, the heat exchange
The temperature difference is greater than the right end point value of second pre-set interval, then controls the aperture of the electric expansion valve with the heat transfer temperature difference
Reduce and reduces；
If described first the result is that: the degree of superheat is less than first preset threshold, alternatively, the degree of superheat be less than it is described
The left end point value of first pre-set interval；Described second the result is that: the heat transfer temperature difference be greater than second preset threshold, alternatively,
The heat transfer temperature difference is greater than the right end point value of second pre-set interval, then controls the aperture of the electric expansion valve with the mistake
The reduction of temperature and reduce.
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| CN201810689042.9A CN108981101B (en) | 2018-06-28 | 2018-06-28 | Control method and control device of electronic expansion valve and unit |
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