CN109442825A - A kind of ultralow temperature frequency conversion heat pump system and its control method and device - Google Patents
A kind of ultralow temperature frequency conversion heat pump system and its control method and device Download PDFInfo
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- CN109442825A CN109442825A CN201811062009.XA CN201811062009A CN109442825A CN 109442825 A CN109442825 A CN 109442825A CN 201811062009 A CN201811062009 A CN 201811062009A CN 109442825 A CN109442825 A CN 109442825A
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- temperature
- increasing enthalpy
- frequency
- throttling set
- changeable compressor
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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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- 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
- F25B49/022—Compressor control arrangements
Abstract
The invention discloses a kind of ultralow temperature frequency conversion heat pump system and its control method and device, the step of this method include: the temperature Tc of the increasing enthalpy import of the temperature Ta for obtaining the air exit of increasing enthalpy frequency-changeable compressor, the temperature Tb, plate heat exchanger of the water in heat-exchanging water tank, the temperature Td of increasing enthalpy outlet, the temperature Te of the evaporation import of evaporator, evaporation outlet temperature Tf and environment temperature Tg；Start or stop heating step according to Tb；The heating step includes: to adjust blower according to Tb and Tg；Main road throttling set is adjusted according to Te and Tf；Increasing enthalpy frequency-changeable compressor is adjusted according to Tb；Increasing enthalpy throttling set is adjusted according to Ta, Tc, Td and Tg.The present invention substitutes pressure data by temperature collection data, can reduce cost from hardware, while the stability of temperature sensor is strong compared with pressure sensor, so that heat pump system operation stability enhances under condition of ultralow temperature.The present invention can be widely applied to heat pump system.
Description
Technical field
The present invention relates to heat pump system, especially a kind of ultralow temperature frequency conversion heat pump system and its control method and device.
Background technique
Due to the appearance of ultralow temperature air injection enthalpy-increasing heat pump system, solves the heating heating of China's major part cold district and encounter
Heating capacity it is poor, the low problem of efficiency so that air source heat pump technology China application reach new height.But at present
Ultralow temperature air injection enthalpy-increasing heat pump system in the market needs multiple pressure sensors, higher cost on hardware, and increases portion
The risk of part ageing failure largely effects on heat pump system operation stability under condition of ultralow temperature.
Summary of the invention
In order to solve the above technical problems, it is an object of the invention to: it is strong and lower-cost ultralow to provide a kind of stability
Warm frequency conversion heat pump system and its control method and device.
The first technical solution adopted by the present invention is:
A kind of ultralow temperature frequency conversion heat pump system, including evaporator, four-way valve, heat-exchanging water tank, plate heat exchanger, increasing enthalpy frequency conversion
Compressor, increasing enthalpy throttling set, blower, main throttling set, controller and the first to the 7th temperature sensor；
First temperature sensor is mounted on the air exit of increasing enthalpy frequency-changeable compressor；
The second temperature sensor is mounted in heat-exchanging water tank；
The third temperature sensor is mounted on the increasing enthalpy import of plate heat exchanger；
4th temperature sensor is mounted on the increasing enthalpy outlet of plate heat exchanger；
5th temperature sensor is mounted on the evaporation import of evaporator；
6th temperature sensor is mounted on the evaporation outlet of evaporator；
7th temperature sensor is mounted in the working environment of system；
The controller respectively with the first to the 7th temperature sensor, blower, increasing enthalpy frequency-changeable compressor, increasing enthalpy throttling set
It is connected with main throttling set.
Further, the evaporation outlet of the evaporator is connect with the first input end of four-way valve, and the first of the four-way valve
The connection of the input terminal of output end and heat-exchanging water tank, the output end of the heat-exchanging water tank and the input terminal of plate heat exchanger connect, institute
The output end for stating plate heat exchanger is connect with the input terminal of the input terminal of increasing enthalpy throttling set and main road throttling set respectively, institute
The evaporation import for stating the output end and evaporator of main road throttling set connects, and the output end of the increasing enthalpy throttling set is changed with board-like
The increasing enthalpy import of hot device connects, and the increasing enthalpy outlet of the plate heat exchanger is connect with the increasing enthalpy import of increasing enthalpy frequency-changeable compressor, institute
Second input terminal of the air exit and four-way valve of stating increasing enthalpy frequency-changeable compressor connects, the second output terminal and increasing of the four-way valve
The return air inlet of enthalpy frequency-changeable compressor connects；The blower is for generating the wind for blowing to evaporator.
Further, the controller includes:
Module is obtained, the temperature of the air exit of the increasing enthalpy frequency-changeable compressor for obtaining the acquisition of the first temperature sensor
The plate heat exchanger that temperature Tb, the third temperature sensor for the water in heat-exchanging water tank that Ta, second temperature sensor acquire acquire
Increasing enthalpy import temperature Tc, the 4th temperature sensor acquisition plate heat exchanger increasing enthalpy outlet temperature Td, the 5th sensing
The temperature Tf of the evaporation outlet of the temperature Te, the evaporator of the 6th temperature sensor acquisition of the evaporation import of the evaporator of device acquisition
And the 7th sensor acquisition environment temperature Tg；
Heating control module is heated for being started according to Tb or being stopped；
The heating control module includes:
Air-blower control unit, for adjusting the revolving speed of blower according to Tb and Tg；
Main road throttling set control unit, for adjusting the valve body aperture of main road throttling set according to Te and Tf；
Increasing enthalpy frequency-changeable compressor control unit, for adjusting the working frequency of increasing enthalpy frequency-changeable compressor according to Tb；
Increasing enthalpy throttling set control unit, for adjusting the valve body aperture of increasing enthalpy throttling set according to Ta, Tc, Td and Tg.
Second of technical solution adopted by the present invention is:
A kind of control method of ultralow temperature frequency conversion heat pump system, comprising the following steps:
Obtain the temperature Ta of the air exit of increasing enthalpy frequency-changeable compressor, temperature Tb, the plate-type heat-exchange of water in heat-exchanging water tank
The temperature Te of the evaporation import of the temperature Td, evaporator of the increasing enthalpy outlet of the temperature Tc, plate heat exchanger of the increasing enthalpy import of device, it steams
Send out the temperature Tf and environment temperature Tg of the evaporation outlet of device；
Start or stop heating step according to Tb；
The heating step includes:
The revolving speed of blower is adjusted according to Tb and Tg；
The valve body aperture of main road throttling set is adjusted according to Te and Tf；
The working frequency of increasing enthalpy frequency-changeable compressor is adjusted according to Tb；
The valve body aperture of increasing enthalpy throttling set is adjusted according to Ta, Tc, Td and Tg.
Further, the revolving speed that blower is adjusted according to Tb and Tg, specifically:
The revolving speed that blower is adjusted according to Tb and Tg makes the revolving speed of blower be equal to S；
Wherein, S=blower optimum speed * environment Water Temperature coefficient * Tg+ blower optimum speed * water tank Water Temperature system
Number * (Tb-15), the blower optimum speed, environment Water Temperature coefficient and water tank Water Temperature coefficient are setting constant.
Further, the valve body aperture that main road throttling set is adjusted according to Te and Tf, specifically:
According to the difference of Tf and Te, the valve body aperture of main road throttling set is adjusted, valve body aperture of main road throttling set etc. is made
In N1；
Wherein, N1=throttles initial step number+restriction coefficient * (Tf-Te- evaporates target temperature difference), the initial step number that throttles,
Restriction coefficient and evaporation target temperature difference are setting constant.
Further, the working frequency that increasing enthalpy frequency-changeable compressor is adjusted according to Tb, specifically:
The working frequency that increasing enthalpy frequency-changeable compressor is adjusted according to Tb makes the working frequency of increasing enthalpy frequency-changeable compressor be equal to H；
Wherein, H=original frequency+coefficient of frequency * (the initial water temperature of Tb-), the original frequency, coefficient of frequency and initial water
Temperature is setting constant.
Further, the valve body aperture that increasing enthalpy throttling set is adjusted according to Ta, Tc, Td and Tg, specifically includes:
First judgment step: judging whether Tg is less than or equal to the minimum start-up temperature of increasing enthalpy, if so, executing the second judgement step
Suddenly；Conversely, then reacquiring Tg, and continue to execute the first judgment step；
Second judgment step: judge whether Ta is more than or equal to the minimum delivery temperature of increasing enthalpy and Ta permits less than or equal to increasing enthalpy highest
Perhaps delivery temperature makes increasing enthalpy throttling set if so, adjusting the valve body aperture of increasing enthalpy throttling set according to the difference of Td and Tc
Valve body aperture is equal to N2；Conversely, then reacquiring Tg and Ta, and returns and execute the first judgment step；
Wherein, the initial step number of N2=increasing enthalpy+increasing enthalpy coefficient * (Td-Tc- increasing enthalpy target temperature difference)；The initial step number of the increasing enthalpy,
Increasing enthalpy coefficient and increasing enthalpy target temperature difference are setting constant.
Further, described to start or stop heating step according to Tb, it specifically includes:
Start detecting step: when system is in heating step resting state, judging that the difference of target water temperature and Tb are
It is no to be more than or equal to the starting temperature difference；If so, starting heating step；Conversely, then reacquiring Tb, and re-execute starting detection step
Suddenly.
Stop detecting step: when system is in the state of heating step starting, judging whether Tb is more than or equal to target water
Temperature, if so, stopping heating step；Conversely, then reacquiring Tb, and re-execute stopping detecting step.
The third technical solution adopted by the present invention is:
A kind of control device of ultralow temperature frequency conversion heat pump system, comprising:
Memory, for storing program；
Processor executes a kind of control method of ultralow temperature frequency conversion heat pump system for loading described program.
The beneficial effects of the present invention are: the present invention substitutes pressure data by temperature collection data, it can from hardware
Cost is reduced, while the stability of temperature sensor is strong compared with pressure sensor, so that heat pump system is run under condition of ultralow temperature
Stability enhancing.
Detailed description of the invention
Fig. 1 is a kind of module frame chart of the ultralow temperature frequency conversion heat pump system of specific embodiment of the present invention；
Fig. 2 is a kind of flow chart of the control method of the ultralow temperature frequency conversion heat pump system of specific embodiment of the present invention.
Specific embodiment
The present invention is further detailed with specific embodiment with reference to the accompanying drawings of the specification.
Referring to Fig.1, a kind of ultralow temperature frequency conversion heat pump system, including evaporator, four-way valve, heat-exchanging water tank, plate heat exchanger,
Increasing enthalpy frequency-changeable compressor, increasing enthalpy throttling set, blower, main throttling set, controller and the first to the 7th temperature sensor；
First temperature sensor is mounted on the air exit of increasing enthalpy frequency-changeable compressor；First temperature sensor is used
In the temperature of the air exit of acquisition increasing enthalpy frequency-changeable compressor, i.e. the temperature Ta of point a.
The second temperature sensor is mounted in heat-exchanging water tank；The second temperature sensor is for acquiring heat-exchanging water tank
The temperature of interior water, i.e. the temperature Tb of point b.
The third temperature sensor is mounted on the increasing enthalpy import of plate heat exchanger；The third temperature sensor is for adopting
Collect the temperature of the increasing enthalpy import of plate heat exchanger, i.e. the temperature Tc of point c.
4th temperature sensor is mounted on the increasing enthalpy outlet of plate heat exchanger；4th temperature sensor is for adopting
Collect the temperature of the increasing enthalpy outlet of plate heat exchanger, i.e. the temperature Td of point d.
5th temperature sensor is mounted on the evaporation import of evaporator；5th temperature sensor is steamed for acquiring
Send out the temperature of the evaporation import of device, i.e. the temperature Te of point e.
6th temperature sensor is mounted on the evaporation outlet of evaporator；6th temperature sensor is steamed for acquiring
Send out the temperature of the evaporation outlet of device, i.e. the temperature Tf of point f.
7th temperature sensor is mounted in the working environment of system；7th temperature sensor is for acquiring system
The temperature Tg of the working environment of system.
According to the actual design needs of system, the first to the 7th temperature sensor can use different ranges, different model
Or the temperature sensor of different brands.
The controller respectively with the first to the 7th temperature sensor, blower, increasing enthalpy frequency-changeable compressor, increasing enthalpy throttling set
It is connected with main throttling set.The controller can by the modes such as wired or wireless and the first to the 7th temperature sensor,
Blower, increasing enthalpy frequency-changeable compressor, increasing enthalpy throttling set and the communication of main throttling set.Wherein, wired mode include I2C bus,
Perhaps the forms wireless mode such as local area network includes the forms such as bluetooth, WIFI or zigbee to universal serial bus.
As preferred embodiment, the present embodiment provides a kind of specific connection relationship of ultralow temperature frequency conversion heat pump system, institutes
The evaporation outlet for stating evaporator is connect with the first input end of four-way valve, the first output end of the four-way valve and heat-exchanging water tank
Input terminal connection, the output end of the heat-exchanging water tank and the input terminal of plate heat exchanger connect, the output of the plate heat exchanger
End connect respectively with the input terminal of the input terminal of increasing enthalpy throttling set and main road throttling set, the main road throttling set it is defeated
The evaporation import of outlet and evaporator connects, and the increasing enthalpy import of the output end and plate heat exchanger of the increasing enthalpy throttling set connects
It connects, the increasing enthalpy outlet of the plate heat exchanger is connect with the increasing enthalpy import of increasing enthalpy frequency-changeable compressor, the increasing enthalpy frequency-changeable compressor
Air exit and the second input terminal of four-way valve connect, the second output terminal of the four-way valve and increasing enthalpy frequency-changeable compressor return
Gas import connection；The blower is for generating the wind for blowing to evaporator.
As preferred embodiment, in order to solve the prior art there are in low-temperature enthalpy-increasing triggering frequent occurrence erroneous judgement or into
Out frequently, optimal increasing enthalpy operating point is missed, system is caused to heat worse problem instead, the controller includes:
Module is obtained, the temperature of the air exit of the increasing enthalpy frequency-changeable compressor for obtaining the acquisition of the first temperature sensor
The plate heat exchanger that temperature Tb, the third temperature sensor for the water in heat-exchanging water tank that Ta, second temperature sensor acquire acquire
Increasing enthalpy import temperature Tc, the 4th temperature sensor acquisition plate heat exchanger increasing enthalpy outlet temperature Td, the 5th sensing
The temperature Tf of the evaporation outlet of the temperature Te, the evaporator of the 6th temperature sensor acquisition of the evaporation import of the evaporator of device acquisition
And the 7th sensor acquisition environment temperature Tg；
Heating control module is heated for being started according to Tb or being stopped；
The heating control module includes:
Air-blower control unit, for adjusting the revolving speed of blower according to Tb and Tg；
Main road throttling set control unit, for adjusting the valve body aperture of main road throttling set according to Te and Tf；
Increasing enthalpy frequency-changeable compressor control unit, for adjusting the working frequency of increasing enthalpy frequency-changeable compressor according to Tb；
Increasing enthalpy throttling set control unit, for adjusting the valve body aperture of increasing enthalpy throttling set according to Ta, Tc, Td and Tg.
The revolving speed that blower is adjusted according to Tb and Tg, specifically:
The revolving speed that blower is adjusted according to Tb and Tg makes the revolving speed of blower be equal to S；
Wherein, S=blower optimum speed * environment Water Temperature coefficient * Tg+ blower optimum speed * water tank Water Temperature system
Number * (Tb-15), the blower optimum speed, environment Water Temperature coefficient and water tank Water Temperature coefficient are setting constant.Its
In, blower optimum speed can be obtained from the product manual of blower, environment Water Temperature coefficient and water tank Water Temperature coefficient
It can be measured by experiment.
The valve body aperture that main road throttling set is adjusted according to Te and Tf, specifically:
According to the difference of Tf and Te, the valve body aperture of main road throttling set is adjusted, valve body aperture of main road throttling set etc. is made
In N1；
Wherein, N1=throttles initial step number+restriction coefficient * (Tf-Te- evaporates target temperature difference), the initial step number that throttles,
Restriction coefficient and evaporation target temperature difference are by testing the setting constant measured.
The working frequency that increasing enthalpy frequency-changeable compressor is adjusted according to Tb, specifically:
The working frequency that increasing enthalpy frequency-changeable compressor is adjusted according to Tb makes the working frequency of increasing enthalpy frequency-changeable compressor be equal to H；
Wherein, H=original frequency+coefficient of frequency * (the initial water temperature of Tb-), the original frequency, coefficient of frequency and initial water
Temperature is the setting constant being determined by experiment.
The valve body aperture that increasing enthalpy throttling set is adjusted according to Ta, Tc, Td and Tg, specifically includes:
First judgment step: judging whether Tg is less than or equal to the minimum start-up temperature of increasing enthalpy, if so, executing the second judgement step
Suddenly；Conversely, then reacquiring Tg, and continue to execute the first judgment step；
Second judgment step: judge whether Ta is more than or equal to the minimum delivery temperature of increasing enthalpy and Ta permits less than or equal to increasing enthalpy highest
Perhaps delivery temperature makes increasing enthalpy throttling set if so, adjusting the valve body aperture of increasing enthalpy throttling set according to the difference of Td and Tc
Valve body aperture is equal to N2；Conversely, then reacquiring Tg and Ta, and returns and execute the first judgment step；
Wherein, the initial step number of N2=increasing enthalpy+increasing enthalpy coefficient * (Td-Tc- increasing enthalpy target temperature difference)；The initial step number of the increasing enthalpy,
Increasing enthalpy coefficient and increasing enthalpy target temperature difference are the setting constant that experiment measures.
It is described to start or stop according to Tb to heat, it specifically includes:
Start detecting step: when system is in heating step resting state, judging that the difference of target water temperature and Tb are
It is no to be more than or equal to the starting temperature difference；If so, starting heating；Conversely, then reacquiring Tb, and re-execute starting detecting step.
Stop detecting step: when system is in the state of heating step starting, judging whether Tb is more than or equal to target water
Temperature, if so, stopping heating；Conversely, then reacquiring Tb, and re-execute stopping detecting step.
Present embodiment discloses a kind of control methods of ultralow temperature frequency conversion heat pump system, comprising the following steps:
S1, the temperature Ta of air exit for obtaining increasing enthalpy frequency-changeable compressor, water in heat-exchanging water tank temperature Tb, board-like change
The temperature Te of the evaporation import of the temperature Td, evaporator of the increasing enthalpy outlet of the temperature Tc, plate heat exchanger of the increasing enthalpy import of hot device,
The temperature Tf and environment temperature Tg of the evaporation outlet of evaporator；
S2, start or stop heating step according to Tb；
The heating step includes:
S3, the revolving speed that blower is adjusted according to Tb and Tg；
S4, the valve body aperture that main road throttling set is adjusted according to Te and Tf；
S5, the working frequency that increasing enthalpy frequency-changeable compressor is adjusted according to Tb；
S6, the valve body aperture that increasing enthalpy throttling set is adjusted according to Ta, Tc, Td and Tg.
Wherein the sequence of S3-S6 in no particular order, can carry out simultaneously, can also carry out according to any order.When Tb meets
When certain condition, no matter the either step in S3-S6 currently is being executed, stopping executing.In the present embodiment, parameter Ta,
Tb, Tc, Td, Te, Tf and Tg can be according to certain period acquisition, and step S2-S6 be also can be according to certain
Loop cycle executes.For example, the revolving speed of blower also changes therewith when Tb and Tg change.Certainly, as the implementation of replacement
Example, the step S3-S6 be also can disposably execute, such as step S3 execute when, just according to Tb and Tg tune at that time
The revolving speed for saving blower, followed by operational process, also without adjusting when Tb and Tg change.
As preferred embodiment, the S3, specifically:
The revolving speed that blower is adjusted according to Tb and Tg makes the revolving speed of blower be equal to S；
Wherein, S=blower optimum speed * environment Water Temperature coefficient * Tg+ blower optimum speed * water tank Water Temperature system
Number * (Tb-15), the blower optimum speed, environment Water Temperature coefficient and water tank Water Temperature coefficient are setting constant.
As preferred embodiment, the S4, specifically:
According to the difference of Tf and Te, the valve body aperture of main road throttling set is adjusted, valve body aperture of main road throttling set etc. is made
In N1；
Wherein, N1=throttles initial step number+restriction coefficient * (Tf-Te- evaporates target temperature difference), the initial step number that throttles,
Restriction coefficient and evaporation target temperature difference are setting constant.The valve body aperture of main road throttling set indicates with step number, the present embodiment
In altogether 480 steps, 0 step indicate valve body close, 480 steps indicate valve body standard-sized sheet.
As preferred embodiment, the S5, specifically:
The working frequency that increasing enthalpy frequency-changeable compressor is adjusted according to Tb makes the working frequency of increasing enthalpy frequency-changeable compressor be equal to H；
Wherein, H=original frequency+coefficient of frequency * (the initial water temperature of Tb-), the original frequency, coefficient of frequency and initial water
Temperature is setting constant.
As preferred embodiment, the present embodiment carries out logic judgment by multiple parameters, determines increasing enthalpy throttling set
Unlatching opportunity promotes heating efficiency, and the S6 is specifically included:
First judgment step: judging whether Tg is less than or equal to the minimum start-up temperature of increasing enthalpy, if so, executing the second judgement step
Suddenly；Conversely, then reacquiring Tg, and continue to execute the first judgment step；
Second judgment step: judge whether Ta is more than or equal to the minimum delivery temperature of increasing enthalpy and Ta permits less than or equal to increasing enthalpy highest
Perhaps delivery temperature makes increasing enthalpy throttling set if so, adjusting the valve body aperture of increasing enthalpy throttling set according to the difference of Td and Tc
Valve body aperture is equal to N2；Conversely, then reacquiring Tg and Ta, and returns and execute the first judgment step；
Wherein, the initial step number of N2=increasing enthalpy+increasing enthalpy coefficient * (Td-Tc- increasing enthalpy target temperature difference)；The minimum starting of increasing enthalpy
Delivery temperature, the initial step number of increasing enthalpy, increasing enthalpy coefficient and the increasing enthalpy target that the minimum delivery temperature of temperature, increasing enthalpy, increasing enthalpy highest allow
The temperature difference is setting constant.The valve body aperture of increasing enthalpy throttling set is indicated with step number, has 480 steps in the present embodiment altogether, and 0 step indicates
Valve body is closed, and 480 steps indicate valve body standard-sized sheet.
As preferred embodiment, the S2 is specifically included:
Start detecting step: when system is in heating step resting state, judging that the difference of target water temperature and Tb are
It is no to be more than or equal to the starting temperature difference；If so, starting heating step, i.e. execution step S3 to S6；Conversely, Tb is then reacquired, and
Re-execute starting detecting step.
Stop detecting step: when system is in the state of heating step starting, judging whether Tb is more than or equal to target water
Temperature stops executing S3 to S6 if so, stopping heating step；Conversely, then reacquiring Tb, and re-execute stopping detection
Step.
Wherein, start the temperature difference and target water temperature is setting constant.
The present invention substitutes pressure data by temperature collection data, and the use of pressure sensor is reduced from hardware, drops
The low cost of system and improve the stability of system.Pass through each temperature data in low-temperature air injection enthalpy increasing entry condition
Judged, so that the triggering of increasing enthalpy is more accurate controllable, heating performance and the offer system for giving full play to super low temperature heat pump are steady
It is qualitative.
Fig. 2 shows a kind of control methods of ultralow temperature frequency conversion heat pump system, firstly, judging that Tb is when unit powers on
It is no to be greater than target water temperature, if so, stopping heating；Conversely, then continuing to heat.After stopping heating, if target water temperature and Tb it
Difference is more than or equal to the starting temperature difference, then starts heating.
When heating starting, the revolving speed of blower is configured first, is then configured the valve body aperture of main road throttling set, is then matched
Set the working frequency of increasing enthalpy frequency-changeable compressor.
It is on the contrary then protect if so, open increasing enthalpy throttling set finally, judge whether to meet first condition and second condition
Increasing enthalpy throttling set is protected to close.Wherein first condition is Tg≤increasing enthalpy cold-starting temperature；Condition is second is that increasing enthalpy starts minimum row
Temperature degree≤Ta≤increasing enthalpy highest allows delivery temperature.Wherein, increasing enthalpy cold-starting temperature, increasing enthalpy start minimum delivery temperature and
The delivery temperature that increasing enthalpy highest allows is the parameter that test measures.
System closes heating after Tb reaches target temperature.
Present embodiment discloses a kind of control devices of ultralow temperature frequency conversion heat pump system, comprising:
Memory, for storing program；It is computer-readable that the memory can be hard disk, CD or storage chip etc.
Storage medium.
Processor executes the control of the ultralow temperature frequency conversion heat pump system of above method embodiment for loading described program
Method.
The present apparatus can be circuit board or computer with memory and processor.
For the step number in above method embodiment, it is arranged only for the purposes of illustrating explanation, between step
Sequence do not do any restriction, the execution of each step in embodiment sequence can according to the understanding of those skilled in the art come into
Row is adaptively adjusted.
It is to be illustrated to preferable implementation of the invention, but the present invention is not limited to the embodiment above, it is ripe
Various equivalent deformation or replacement can also be made on the premise of without prejudice to spirit of the invention by knowing those skilled in the art, this
Equivalent deformation or replacement are all included in the scope defined by the claims of the present application a bit.
Claims (10)
1. a kind of ultralow temperature frequency conversion heat pump system, it is characterised in that: including evaporator, four-way valve, heat-exchanging water tank, plate-type heat-exchange
Device, increasing enthalpy frequency-changeable compressor, increasing enthalpy throttling set, blower, main throttling set, controller and the first to the 7th temperature sensing
Device；
First temperature sensor is mounted on the air exit of increasing enthalpy frequency-changeable compressor；
The second temperature sensor is mounted in heat-exchanging water tank；
The third temperature sensor is mounted on the increasing enthalpy import of plate heat exchanger；
4th temperature sensor is mounted on the increasing enthalpy outlet of plate heat exchanger；
5th temperature sensor is mounted on the evaporation import of evaporator；
6th temperature sensor is mounted on the evaporation outlet of evaporator；
7th temperature sensor is mounted in the working environment of system；
The controller respectively with the first to the 7th temperature sensor, blower, increasing enthalpy frequency-changeable compressor, increasing enthalpy throttling set and master
Throttling set connection.
2. a kind of ultralow temperature frequency conversion heat pump system according to claim 1, it is characterised in that: the evaporator evaporates
Mouth is connect with the first input end of four-way valve, and the first output end of the four-way valve and the input terminal of heat-exchanging water tank connect, described
The output end of heat-exchanging water tank and the input terminal of plate heat exchanger connect, and the output end of the plate heat exchanger throttles with increasing enthalpy respectively
The input terminal connection of the input terminal and main road throttling set of device, the steaming of the output end and evaporator of the main road throttling set
Import connection is sent out, the increasing enthalpy import of the output end and plate heat exchanger of the increasing enthalpy throttling set connects, the plate heat exchanger
Increasing enthalpy outlet connect with the increasing enthalpy import of increasing enthalpy frequency-changeable compressor, the air exit and four-way valve of the increasing enthalpy frequency-changeable compressor
The connection of the second input terminal, the second output terminal of the four-way valve connect with the return air inlet of increasing enthalpy frequency-changeable compressor；The wind
Machine is for generating the wind for blowing to evaporator.
3. a kind of ultralow temperature frequency conversion heat pump system according to claim 1, it is characterised in that: the controller includes:
Module is obtained, the temperature Ta of the air exit for obtaining the increasing enthalpy frequency-changeable compressor that the first temperature sensor acquires, the
The increasing enthalpy for the plate heat exchanger that temperature Tb, the third temperature sensor of water in the heat-exchanging water tank of two temperature sensors acquisition acquire
The temperature Td of the increasing enthalpy outlet of the temperature Tc, the plate heat exchanger of the 4th temperature sensor acquisition of import, the acquisition of the 5th sensor
The temperature Te of evaporation import of evaporator, the acquisition of the 6th temperature sensor evaporator evaporation outlet temperature Tf and the
The environment temperature Tg of seven sensors acquisition；
Heating control module is heated for being started according to Tb or being stopped；
The heating control module includes:
Air-blower control unit, for adjusting the revolving speed of blower according to Tb and Tg；
Main road throttling set control unit, for adjusting the valve body aperture of main road throttling set according to Te and Tf；
Increasing enthalpy frequency-changeable compressor control unit, for adjusting the working frequency of increasing enthalpy frequency-changeable compressor according to Tb；
Increasing enthalpy throttling set control unit, for adjusting the valve body aperture of increasing enthalpy throttling set according to Ta, Tc, Td and Tg.
4. a kind of control method of ultralow temperature frequency conversion heat pump system, it is characterised in that: the following steps are included:
Obtain the temperature Ta of the air exit of increasing enthalpy frequency-changeable compressor, the temperature Tb of water in heat-exchanging water tank, plate heat exchanger
Temperature Te, the evaporator of the evaporation import of the temperature Td, evaporator of the increasing enthalpy outlet of the temperature Tc, plate heat exchanger of increasing enthalpy import
Evaporation outlet temperature Tf and environment temperature Tg；
Start or stop heating step according to Tb；
The heating step includes:
The revolving speed of blower is adjusted according to Tb and Tg；
The valve body aperture of main road throttling set is adjusted according to Te and Tf；
The working frequency of increasing enthalpy frequency-changeable compressor is adjusted according to Tb；
The valve body aperture of increasing enthalpy throttling set is adjusted according to Ta, Tc, Td and Tg.
5. a kind of control method of ultralow temperature frequency conversion heat pump system according to claim 4, it is characterised in that: the basis
Tb and Tg adjusts the revolving speed of blower, specifically:
The revolving speed that blower is adjusted according to Tb and Tg makes the revolving speed of blower be equal to S；
Wherein, S=blower optimum speed * environment Water Temperature coefficient * Tg+ blower optimum speed * water tank Water Temperature coefficient *
(Tb-15), the blower optimum speed, environment Water Temperature coefficient and water tank Water Temperature coefficient are setting constant.
6. a kind of control method of ultralow temperature frequency conversion heat pump system according to claim 4, it is characterised in that: the basis
Te and Tf adjusts the valve body aperture of main road throttling set, specifically:
According to the difference of Tf and Te, the valve body aperture of main road throttling set is adjusted, the valve body aperture of main road throttling set is made to be equal to N1；
Wherein, N1=throttles initial step number+restriction coefficient * (Tf-Te- evaporates target temperature difference), the initial step number, restriction coefficient of throttling
It is setting constant with evaporation target temperature difference.
7. a kind of control method of ultralow temperature frequency conversion heat pump system according to claim 4, it is characterised in that: the basis
Tb adjusts the working frequency of increasing enthalpy frequency-changeable compressor, specifically:
The working frequency that increasing enthalpy frequency-changeable compressor is adjusted according to Tb makes the working frequency of increasing enthalpy frequency-changeable compressor be equal to H；
Wherein, H=original frequency+coefficient of frequency * (the initial water temperature of Tb-), the original frequency, coefficient of frequency and initial water temperature are equal
To set constant.
8. a kind of control method of ultralow temperature frequency conversion heat pump system according to claim 4, it is characterised in that: the basis
Ta, Tc, Td and Tg adjust the valve body aperture of increasing enthalpy throttling set, specifically include:
First judgment step: judging whether Tg is less than or equal to the minimum start-up temperature of increasing enthalpy, if so, executing the second judgment step；
Conversely, then reacquiring Tg, and continue to execute the first judgment step；
Second judgment step: judge whether Ta is more than or equal to the minimum delivery temperature of increasing enthalpy and Ta is less than or equal to what increasing enthalpy highest allowed
Delivery temperature makes the valve body of increasing enthalpy throttling set if so, adjusting the valve body aperture of increasing enthalpy throttling set according to the difference of Td and Tc
Aperture is equal to N2；Conversely, then reacquiring Tg and Ta, and returns and execute the first judgment step；
Wherein, the initial step number of N2=increasing enthalpy+increasing enthalpy coefficient * (Td-Tc- increasing enthalpy target temperature difference)；The minimum start-up temperature of the increasing enthalpy,
Delivery temperature, the initial step number of increasing enthalpy, increasing enthalpy coefficient and the increasing enthalpy target temperature difference that the minimum delivery temperature of increasing enthalpy, increasing enthalpy highest allow are equal
To set constant.
9. a kind of control method of ultralow temperature frequency conversion heat pump system according to claim 4, it is characterised in that: the basis
Tb starting stops heating step, specifically includes:
Start detecting step: when system is in heating step resting state, judging whether the difference of target water temperature and Tb are big
Start the temperature difference in being equal to；If so, starting heating step；Conversely, then reacquiring Tb, and re-execute starting detecting step.
Stop detecting step: when system is in the state of heating step starting, judging whether Tb is more than or equal to target water temperature, if
It is then to stop heating step；Conversely, then reacquiring Tb, and re-execute stopping detecting step；
Wherein, target water temperature and the starting temperature difference are setting constant.
10. a kind of control device of ultralow temperature frequency conversion heat pump system characterized by comprising
Memory, for storing program；
Processor, for loading described program to execute such as a kind of described in any item ultralow temperature frequency conversion heat pumps of claim 4-9
The control method of system.
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Application publication date: 20190308 |