CN106642806B - For controlling the control method and heat pump unit of the operation of compressor - Google Patents
For controlling the control method and heat pump unit of the operation of compressor Download PDFInfo
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- CN106642806B CN106642806B CN201610926986.4A CN201610926986A CN106642806B CN 106642806 B CN106642806 B CN 106642806B CN 201610926986 A CN201610926986 A CN 201610926986A CN 106642806 B CN106642806 B CN 106642806B
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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
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The present invention relates to the control methods of the operation for controlling compressor and associated heat pump unit.According to an aspect of the present invention, it provides a kind of for controlling the control method of the operation of compressor (1).The control method is the following steps are included: obtain the pressure at expulsion (Pd) of the compressor (1)；Obtain the pressure of inspiration(Pi) (Ps) of the compressor (1)；Pressure at expulsion obtained (Pd) and pressure of inspiration(Pi) obtained (Ps) are compared with preset pressure ratio limit value；And the operation of the compressor (1) is controlled based on pressure ratio comparison result.According to the present invention it is possible to prevent the operating pressure over range of compressor, and then compressor can be effectively protected and extend the service life of compressor.
Description
Technical field
The present invention relates to art of heat pumps, and in particular to improved one kind is made in terms of the control of the operating pressure of compressor
For controlling the control method and a kind of associated heat pump unit of the operation of compressor.
Background technique
Currently, pressure control of the heat pump unit (such as cold-warm type air-conditioning unit and air friction drag) to compressor
System generally stays in solely setting maximum pressure protection value (such as the B-A horizontal line in Fig. 2 --- pressure at expulsion upper limit line)
With minimum pressure protection value (such as the E-C vertical line in Fig. 2 --- pressure of inspiration(Pi) lower limit line).This protected mode is not able to
Thoroughly protection compressor (such as frequency-changeable compressor) is run in reliability service pressure limit, thus it is impossible to ensure that compressor
Life cycle.
Here, it is noted that technology contents provided in this part are intended to facilitate those skilled in the art couple
Understanding of the invention, and not necessarily constitute the prior art.
Summary of the invention
In order to solve the problems, such as or mitigate at least one in the above problem in the presence of the relevant technologies, the present invention provides one
Plant the control method and a kind of associated heat pump unit for controlling the operation of compressor, it is intended to prevent the operation pressure of compressor
Power over range, and then be effectively protected compressor and extend the service life of compressor.
According to an aspect of the present invention, it provides a kind of for controlling the control method of the operation of compressor.The control
Method is the following steps are included: obtain the pressure at expulsion of the compressor；Obtain the pressure of inspiration(Pi) of the compressor；It will be obtained
Pressure at expulsion and pressure of inspiration(Pi) obtained are compared with preset pressure ratio limit value；And it is based on the control of pressure ratio comparison result
The operation of the compressor is made,
Wherein, the pressure ratio limit value includes high pressure limit ratio, and the high pressure limit ratio is limited by high pressure ratio critical curve equation
Fixed, the high pressure ratio critical curve equation passes through the operating pressure range curve to the compressor (1) under peak load rate
It is fitted and obtains, the high pressure ratio critical curve equation are as follows: Pd '=δ '+ε ' * Ps, wherein Pd ' is high pressure ratio exhaust pressure
Power limit value, δ ' are constant, and ε ' is the slope of high pressure ratio critical curve, and Ps is pressure of inspiration(Pi), by pressure at expulsion obtained (Pd)
The step of being compared with pressure of inspiration(Pi) obtained (Ps) with preset pressure ratio limit value includes: by pressure of inspiration(Pi) obtained
Power (Ps) substitutes into the high pressure ratio critical curve equation and obtains high pressure ratio pressure at expulsion limit value (Pd '), then will be obtained
Pressure at expulsion (Pd) is compared with the high pressure ratio pressure at expulsion limit value (Pd '), and at pressure at expulsion obtained (Pd)
Determine that the high pressure limit ratio is exceeded when greater than high pressure ratio pressure at expulsion limit value (Pd ')；And/or
The pressure ratio limit value includes low pressure limit ratio, and the low pressure limit ratio is limited by low-pressure ratio critical curve equation, institute
Low-pressure ratio critical curve equation is stated by intending operating pressure range curve of the compressor (1) under ratio of minimum load to maximum load
Close and obtain, the low-pressure ratio critical curve equation are as follows: Pd "=δ "+ε " * Ps, wherein Pd " is low-pressure ratio pressure at expulsion limit value,
δ " is constant, and ε " is the slope of low-pressure ratio critical curve, and Ps is pressure of inspiration(Pi), by pressure at expulsion obtained (Pd) and is obtained
Pressure of inspiration(Pi) (Ps) the step of being compared with preset pressure ratio limit value include: by pressure of inspiration(Pi) obtained (Ps) generation
Enter the low-pressure ratio critical curve equation and obtain low-pressure ratio pressure at expulsion limit value (Pd "), then by pressure at expulsion obtained
(Pd) it is compared with the low-pressure ratio pressure at expulsion limit value (Pd "), and at pressure at expulsion obtained (Pd) less than described
Determine that the low pressure limit ratio is exceeded when low-pressure ratio pressure at expulsion limit value (Pd ").
Preferably, in above-mentioned control method: the compressor is the compressor that workload rate can be adjusted, and,
The step of controlling the operation of the compressor based on pressure ratio comparison result includes: to reduce when the high pressure limit ratio is exceeded
The workload rate of the compressor.
Preferably, in above-mentioned control method, the step of operation of the compressor is controlled based on pressure ratio comparison result packet
It includes: being still exceeded in the high pressure limit ratio described when the workload rate of the compressor is reduced to minimum workload rate
In the case of, remain operational the compressor with minimum workload rate.
Preferably, in above-mentioned control method: the compressor is the compressor that workload rate can be adjusted, and,
The step of controlling the operation of the compressor based on pressure ratio comparison result includes: to make when the low pressure limit ratio is exceeded
The compressor is sent out low-pressure ratio protection signal to notify user while remaining operational.
Preferably, in above-mentioned control method, the control method includes following pool rate-determining steps: planning as a whole ground referring to pressure
Than the independent pressure at expulsion between comparison result and pressure at expulsion obtained and preset independent pressure at expulsion limit value
Comparison result controls the operation of the compressor, and/or, plan as a whole ground referring to pressure ratio comparison result and suction obtained
Independent pressure of inspiration(Pi) comparison result between atmospheric pressure and preset independent pressure of inspiration(Pi) limit value controls the compressor
Operation.
Preferably, in above-mentioned control method, the pool rate-determining steps include: when the pressure ratio limit value is exceeded first
When, according to the operation for controlling the compressor based on the control mode that pressure ratio transfinites, when the independent pressure at expulsion limit value or institute
When stating independent pressure of inspiration(Pi) limit value and being exceeded first, the compressor is controlled according to the control mode based on independent pressure limit
Operation.
Preferably, in above-mentioned control method, it is described plan as a whole rate-determining steps include: by the operation of compressor control at
So that the pressure at expulsion and pressure of inspiration(Pi) of the compressor are limited in the range of envelope figure line, the envelope figure line is substantially in two
Rectangle that a opposite angle is cut off and by following lines part lines or whole lines define: with the pressure ratio limit value
The corresponding high pressure ratio fit line of high pressure limit ratio, the pressure at expulsion upper limit corresponding with the independent pressure at expulsion limit value of the upper limit is belonged to
Line, pressure of inspiration(Pi) upper limit line corresponding with the independent pressure of inspiration(Pi) limit value of the upper limit is belonged to, the low-pressure ratio limit with the pressure ratio limit value
It is worth corresponding low-pressure ratio fit line, pressure at expulsion lower limit line corresponding with the independent pressure at expulsion limit value of lower limit is belonged to, Yi Jiyu
Belong to the corresponding pressure of inspiration(Pi) lower limit line of independent pressure of inspiration(Pi) limit value of lower limit, wherein the high pressure ratio fit line is by high pressure ratio
Critical curve equation limits, and the low-pressure ratio fit line is limited by low-pressure ratio critical curve equation.
Preferably, in above-mentioned control method: the compressor is frequency-changeable compressor or positive displacement compressor, and, it is based on
It includes: the work that the compressor is controlled based on pressure ratio comparison result that pressure ratio comparison result, which controls the step of operation of the compressor,
Working frequency or displacement volume.
According to another aspect of the present invention, a kind of heat pump unit is provided.The heat pump unit includes compressor and control dress
It sets, control method controls the operation of the compressor to the control device as described above.
According to the present invention, in the operation of heat pump unit, by referring to high pressure ratio fit line, low-pressure ratio fit line to heat pump
The compressor of unit carries out pressure protection.It therefore, can be with compared with the relevant programme for only carrying out high voltage protective and low-voltage variation
Pressure is set to control the reliability service pressure limit of properer compressor.On the other hand, due to protecting and tradition high-low pressure ratio
High-low pressure protection plan as a whole ground combine, therefore can successfully be prevented using enveloping method compressor over range run, in turn
Compressor can be effectively protected and extend the service life of compressor.
Detailed description of the invention
By referring to the drawings to the detailed description of embodiment of the present invention, above-mentioned and other mesh of the invention
, feature and advantage will be apparent from, in the accompanying drawings:
Fig. 1 is the structural block diagram for showing heat pump unit according to the present invention；And
Fig. 2 is to schematically show compressor operating pressure areal map relevant to control method according to the present invention.
Specific embodiment
With reference to the accompanying drawings, by illustrative embodiments, the present invention will be described in detail.To it is of the invention it is following in detail
Thin description is definitely not to the present invention and its application or the limitation of purposes merely for the sake of illustration purpose.
(Fig. 1 is the structural block diagram for showing heat pump unit according to the present invention) referring to Fig.1, heat pump unit according to the present invention
100 include compressor 1 and control device (not shown).In the example shown in the series of figures, heat pump unit 100 can also include: exhaust sense
Thermometer bulb 2, high pressure sensor (back pressure transducer) 3, high-voltage switch gear 4, four-way valve 5, finned heat exchanger 6, environment temperature sensing package 7,
Defrost temperature sensing package 8, filter 9, electric expansion valve 10, plate heat exchanger 11,12 He of low pressure sensor (inspiratory pressure sensor)
Air-breathing temperature sensing package 13.Control device is suitable for controlling the operation of heat pump unit 100, this includes the operation for controlling compressor 1.
Here, it should be noted that plate heat exchanger 11 is shown in FIG. 1 and water carries out heat exchange to carry out to water
Example of the air friction drag of heating as heat pump unit according to the present invention, it being understood, however, that according to this hair
Bright heat pump unit may include other type units, such as cold-warm type air-conditioning unit.
Back pressure transducer 3 and inspiratory pressure sensor 12 can be with the pressure values of real-time detection compressor 1 to obtain
Pressure at expulsion Pd and pressure of inspiration(Pi) Ps.Additionally or alternatively, heat pump unit 100 can be based on the correlation of heat pump unit 100
Operation data estimates pressure and obtains pressure at expulsion Pd and pressure of inspiration(Pi) Ps according to appropriate algorithm.
Compressor 1 can be the compressor that workload rate can be adjusted.For example, compressor 1 can be working frequency energy
The positive displacement compressor that the frequency-changeable compressor or displacement volume being enough conditioned can be conditioned.
According to the present invention, the control method of the operation for controlling compressor 1 is provided, which may include following
Step.
The pressure at expulsion Pd of compressor 1 is obtained by detection (by back pressure transducer 3) and/or estimation.
The pressure of inspiration(Pi) Ps of compressor 1 is obtained by detection (by inspiratory pressure sensor 12) and/or estimation.
Pressure at expulsion Pd obtained and pressure of inspiration(Pi) Ps obtained are compared with preset pressure ratio limit value.
Operation based on pressure ratio comparison result control compressor 1.
Pressure ratio limit value may include high pressure limit ratio.High pressure limit ratio can be limited by high pressure ratio critical curve equation.?
This respect can obtain compressor 1 under peak load rate according to the operating pressure areal map of the compressor 1 of heat pump unit 100
Range of operation curve, may then pass through the range of operation curve to compressor 1 under peak load rate and be fitted and obtain
Obtain high pressure ratio critical curve equation.As shown in Fig. 2, in the case where compressor is in highest pressure at expulsion limit value, as needed
The delivery temperature reached can determine the pressure of inspiration(Pi) of B point, equally, the case where compressor is in minimum pressure of inspiration(Pi) limit value
Under, the delivery temperature reached as needed can also determine the pressure at expulsion of C point, may thereby determine that out high pressure ratio critical curve
On two points of B, C, multiple qualified high pressure ratio points between B, C can also be obtained by this method, then to this
A little points are fitted to obtain high pressure ratio critical curve equation.
In a specific embodiment, for example, high pressure ratio critical curve equation can determine are as follows: Pd '=δ '+ε ' * Ps,
As shown in Figure 2, wherein δ ' is the intersection point that high pressure ratio critical curve extends to y-axis, is a constant, and ε ' is the critical song of high pressure ratio
The slope of line.Specifically, two points of B, C in Fig. 2 are obtained by the above method, then connects BC, above-mentioned high pressure can be obtained
Than critical curve equation.
Pressure at expulsion Pd obtained and pressure of inspiration(Pi) Ps obtained and preset pressure ratio limit value are carried out as a result,
The step of comparing may include: that pressure of inspiration(Pi) Ps obtained is substituted into high pressure ratio critical curve equation and obtains high pressure ratio exhaust
Pressure at expulsion Pd obtained and high pressure ratio pressure at expulsion limit value Pd ' are then compared by pressure limit (safety value) Pd ',
And determine that high pressure limit ratio is exceeded when pressure at expulsion Pd obtained is greater than high pressure ratio pressure at expulsion limit value Pd '.Here,
It should be appreciated that alternatively it is possible to pressure at expulsion Pd obtained being substituted into corresponding high pressure ratio critical curve equation and is obtained
It obtains high pressure ratio pressure of inspiration(Pi) limit value (safety value) and is compared and controls.
In some instances, the step of controlling the operation of compressor 1 based on pressure ratio comparison result may include: to work as high pressure ratio
When limit value is exceeded, reduce the workload rate of compressor 1；The step of controlling the operation of compressor 1 based on pressure ratio comparison result
Can also include: when the workload rate of compressor 1 is reduced to minimum workload rate high pressure limit ratio be still exceeded
In the case where, remain operational compressor 1 with minimum workload rate.
For example, when the pressure at expulsion Pd that back pressure transducer 3 detects is greater than high pressure ratio pressure at expulsion limit value Pd ',
Compressor 1 is forced to carry out frequency reducing control.Then, it carries out pressure detecting again after elapse of a predetermined time, and carries out again
Multilevel iudge.During frequency reducing, if the pressure at expulsion Pd that back pressure transducer 3 detects is still greater than high pressure ratio exhaust pressure
Power limit value Pd ' and lowest operating frequency is had been reduced at this time, then still run by lowest operating frequency.Once pressure at expulsion senses
The pressure at expulsion Pd that device 3 detects is less than or equal to high pressure ratio pressure at expulsion limit value Pd ', then can exit high pressure ratio protection, at this time
It can be controlled and be adjusted by healthy compressor control mode.
Pressure ratio limit value may include low pressure limit ratio.Low pressure limit ratio can be limited by low-pressure ratio critical curve equation.?
This respect can obtain compressor 1 under ratio of minimum load to maximum load according to the operating pressure areal map of the compressor 1 of heat pump unit 100
Range of operation curve, may then pass through the operating pressure range curve to compressor 1 under ratio of minimum load to maximum load and be fitted
And obtain low-pressure ratio critical curve equation.As shown in Fig. 2, in the case where compressor is in minimum pressure at expulsion limit value, according to
Need delivery temperature to be achieved that can determine that (in Fig. 2, E point is that compressor is in minimum pressure of inspiration(Pi) limit value for the pressure of inspiration(Pi) of E point
Situation on Ps-t2, in the case of other, E point can also be located on minimum pressure at expulsion limit value line), equally, it is in compressor
In the case where maximal inspiratory pressure power limit value, the delivery temperature reached as needed can also determine the pressure at expulsion of D point, so as to
To determine two points of E, D on low-pressure ratio critical curve, can also obtain by this method between E, D multiple meets item
Then the low-pressure ratio point of part is fitted to obtain low-pressure ratio critical curve equation to these points.
In a specific embodiment, as shown in Fig. 2, low-pressure ratio critical curve equation can be with are as follows: Pd "=δ "+ε " * Ps,
Wherein, δ " is the intersection point that low-pressure ratio critical curve extends to y-axis, is a constant, and ε " is the slope of low-pressure ratio critical curve.Tool
Body, two points of E, D in Fig. 2 are obtained by the above method, ED is then connected, above-mentioned low-pressure ratio critical curve side can be obtained
Journey.
Pressure at expulsion Pd obtained and pressure of inspiration(Pi) Ps obtained and preset pressure ratio limit value are carried out as a result,
The step of comparing may include: that pressure of inspiration(Pi) Ps obtained is substituted into low-pressure ratio critical curve equation and obtains low-pressure ratio exhaust
Pressure at expulsion Pd obtained and low-pressure ratio pressure at expulsion limit value Pd " are then compared by pressure limit (safety value) Pd ",
And determine that low pressure limit ratio is exceeded when pressure at expulsion Pd obtained is less than low-pressure ratio pressure at expulsion limit value Pd ".Here,
It should be appreciated that alternatively it is possible to pressure at expulsion Pd obtained being substituted into corresponding low-pressure ratio critical curve equation and is obtained
It obtains low-pressure ratio pressure of inspiration(Pi) limit value (safety value) and is compared and controls.
In some instances, the step of controlling the operation of compressor 1 based on pressure ratio comparison result may include: to work as low-pressure ratio
When limit value is exceeded, low-pressure ratio protection signal is sent out while remaining operational compressor 1 to notify user.
For example, when the pressure at expulsion Pd that back pressure transducer 3 detects is less than low-pressure ratio pressure at expulsion limit value Pd ",
Heat pump unit 100(is including compressor 1) it continues to run (such as continuing to run with current work load rate) but sends low
Pressure ratio protects signal to display board to notify user.Once the pressure at expulsion Pd that back pressure transducer 3 detects is more than or equal to
Low-pressure ratio pressure at expulsion limit value Pd " then stops sending protection signal, can be controlled at this time by healthy compressor control mode
And adjusting.
According to the present invention, control method can also include following pool rate-determining steps: plan as a whole ground referring to pressure ratio comparison result
And the independent exhaust pressure between pressure at expulsion Pd obtained and preset independent pressure at expulsion limit value Pd-t1, Pd-t2
Power comparison result controls the operation of compressor 1, and/or, plan as a whole ground referring to pressure ratio comparison result and suction obtained
Independent pressure of inspiration(Pi) comparison result between atmospheric pressure Ps and preset independent pressure of inspiration(Pi) limit value Ps-t1, Ps-t2 is controlled
The operation of compressor 1 processed.
Planning as a whole rate-determining steps may further include: when pressure ratio limit value is exceeded first, according to what is transfinited based on pressure ratio
Control mode (such as mode as described above) controls the operation of compressor 1, when independent pressure at expulsion limit value or independent air-breathing
When pressure limit is exceeded first, according to the control mode (such as traditional high-low pressure protected mode) based on independent pressure limit
Control the operation of compressor 1.
Referring to Fig. 2, (Fig. 2 is to schematically show compressor operating pressure model relevant to control method according to the present invention
Enclose figure), in a preferable example, planning as a whole rate-determining steps may further include: by the operation of compressor 1 control to compress
The pressure at expulsion Pd and pressure of inspiration(Pi) Ps of machine 1 are limited in the range of envelope figure line CV1.Envelope figure line CV1 can substantially be in two
Rectangle that a opposite angle (that is, pressure ratio high the low lower right corner in the upper left corner and pressure ratio) is cut off and can be by with offline
Part lines or whole lines in item define: high pressure ratio fit line C-B corresponding with the high pressure limit ratio of pressure ratio limit value and category
In the upper limit the corresponding pressure at expulsion upper limit line B-A of independent pressure at expulsion limit value Pd-t1, with belong to the independent pressure of inspiration(Pi) of the upper limit
The corresponding pressure of inspiration(Pi) upper limit line A-D of limit value Ps-t1, low-pressure ratio fit line D-E corresponding with the low pressure limit ratio of pressure ratio limit value,
Pressure at expulsion lower limit line corresponding with the independent pressure at expulsion limit value Pd-t2 of lower limit is belonged to and with the independent suction that belongs to lower limit
The corresponding pressure of inspiration(Pi) lower limit line E-C of atmospheric pressure limit value Ps-t2.High pressure ratio fit line C-B can be by high pressure ratio as described above
Critical curve equation limits, and low-pressure ratio fit line D-E can be limited by low-pressure ratio critical curve equation as described above.
In Fig. 2, figure CV1 and figure CV2 can respectively indicate the different operating pressure ranges of different compressors, can also
To respectively indicate different operating pressure ranges of the same compressor under different operating conditions.Different compressors or same compressor
Different operating conditions under can determine high pressure ratio critical curve and pressure ratio critical curve by the method in the application, thus right
Compressor is better controlled.
According to the present invention, in the operation of heat pump unit, by referring to high pressure ratio fit line, low-pressure ratio fit line to heat pump
The compressor of unit carries out pressure protection.It therefore, can be with compared with the relevant programme for only carrying out high voltage protective and low-voltage variation
Pressure is set to control the reliability service pressure limit of properer compressor.On the other hand, due to protecting and tradition high-low pressure ratio
High-low pressure protection plan as a whole ground combine, therefore can successfully be prevented using enveloping method compressor over range run, in turn
Compressor can be effectively protected and extend the service life of compressor.
It should be noted that in the present specification, whenever referring to " some examples ", " other examples ", " example of diagram "
Mean whens " preferred example " etc. for the example description specific feature, structure or feature include it is of the invention extremely
In a few example.The appearance of these words different places in the present specification is not necessarily all referring to same example.In addition, working as needle
When describing specific feature, structure or feature to any example, it will be understood that those skilled in the art also can be all described
This feature, structure or feature are realized in other examples in example.
In addition, in present specification, term " includes " or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also can be with
Including the other elements being not explicitly listed, or can also include for this process, method, article or equipment institute inherently
Element.
Finally it should be noted that, it is clear that, above embodiment/example is only intended to clearly illustrate made by the present invention and lifts
Example, and not limitation of the present invention.To those skilled in the art, it can also be made on the basis of the above description
Its various forms of variation or variation.There is no need and unable to be exhaustive to all embodiment/examples.And thus drawn
The obvious changes or variations that Shen goes out are still in the protection scope of this invention.
Claims (9)
1. the control method of operation of the one kind for controlling compressor (1), which is characterized in that the control method includes following step
It is rapid:
Obtain the pressure at expulsion (Pd) of the compressor (1)；
Obtain the pressure of inspiration(Pi) (Ps) of the compressor (1)；
Pressure at expulsion obtained (Pd) and pressure of inspiration(Pi) obtained (Ps) are compared with preset pressure ratio limit value；
And
The operation of the compressor (1) is controlled based on pressure ratio comparison result,
Wherein, the pressure ratio limit value includes high pressure limit ratio, and the high pressure limit ratio is limited by high pressure ratio critical curve equation, institute
High pressure ratio critical curve equation is stated by intending operating pressure range curve of the compressor (1) under peak load rate
It closing and obtains, the high pressure ratio critical curve equation are as follows: Pd '=δ '+ε ' * Ps, wherein Pd ' is high pressure ratio pressure at expulsion limit value,
δ ' is constant, and ε ' is the slope of high pressure ratio critical curve, and Ps is pressure of inspiration(Pi), by pressure at expulsion obtained (Pd) and is obtained
Pressure of inspiration(Pi) (Ps) the step of being compared with preset pressure ratio limit value include: by pressure of inspiration(Pi) obtained (Ps) generation
Enter the high pressure ratio critical curve equation and obtain high pressure ratio pressure at expulsion limit value (Pd '), then by pressure at expulsion obtained
(Pd) it is compared with the high pressure ratio pressure at expulsion limit value (Pd '), and at pressure at expulsion obtained (Pd) greater than described
Determine that the high pressure limit ratio is exceeded when high pressure ratio pressure at expulsion limit value (Pd ')；And/or
The pressure ratio limit value includes low pressure limit ratio, and the low pressure limit ratio is limited by low-pressure ratio critical curve equation, described low
Pressure ratio critical curve equation is and being fitted operating pressure range curve of the compressor (1) under ratio of minimum load to maximum load
Obtain, the low-pressure ratio critical curve equation are as follows: Pd "=δ "+ε " * Ps, wherein Pd " is low-pressure ratio pressure at expulsion limit value, and δ " is
Constant, ε " are the slope of low-pressure ratio critical curve, and Ps is pressure of inspiration(Pi), by pressure at expulsion obtained (Pd) and suction obtained
The step of atmospheric pressure (Ps) is compared with preset pressure ratio limit value includes: that pressure of inspiration(Pi) obtained (Ps) is substituted into institute
It states low-pressure ratio critical curve equation and obtains low-pressure ratio pressure at expulsion limit value (Pd "), then by pressure at expulsion obtained (Pd)
It is compared with the low-pressure ratio pressure at expulsion limit value (Pd "), and is less than the low pressure at pressure at expulsion obtained (Pd)
Than determining that the low pressure limit ratio is exceeded when pressure at expulsion limit value (Pd ").
2. control method according to claim 1, it is characterised in that:
The compressor (1) is the compressor that workload rate can be adjusted, and
The step of controlling the operation of the compressor (1) based on pressure ratio comparison result includes: when the high pressure limit ratio is exceeded
When, reduce the workload rate of the compressor (1).
3. control method according to claim 2, which is characterized in that control the compressor based on pressure ratio comparison result
(1) the step of operation includes:
Still surpassed in the high pressure limit ratio described when the workload rate of the compressor (1) is reduced to minimum workload rate
In the case where out, remain operational the compressor (1) with minimum workload rate.
4. control method according to claim 1, it is characterised in that:
The compressor (1) is the compressor that workload rate can be adjusted, and
The step of controlling the operation of the compressor (1) based on pressure ratio comparison result includes: when the low pressure limit ratio is exceeded
When, low-pressure ratio protection signal is sent out while remaining operational the compressor (1) to notify user.
5. control method according to any one of claim 1 to 4, which is characterized in that the control method includes following
Plan as a whole rate-determining steps: planning as a whole ground referring to pressure ratio comparison result and pressure at expulsion obtained (Pd) and preset independent row
Independent pressure at expulsion relatively result between atmospheric pressure limit value (Pd-t1, Pd-t2) controls the operation of the compressor (1), and
And/or person, plan as a whole ground referring to pressure ratio comparison result and pressure of inspiration(Pi) obtained (Ps) and preset independent pressure of inspiration(Pi)
Independent pressure of inspiration(Pi) comparison result between power limit value (Ps-t1, Ps-t2) controls the operation of the compressor (1).
6. control method according to claim 5, which is characterized in that the pool rate-determining steps include: when the pressure ratio
When limit value is exceeded first, the operation of the compressor (1) is controlled according to the control mode to transfinite based on pressure ratio, when described independent
When pressure at expulsion limit value or the independent pressure of inspiration(Pi) limit value are exceeded first, according to the control mode based on independent pressure limit
Control the operation of the compressor (1).
7. control method according to claim 5, which is characterized in that the pool rate-determining steps include:
The operation of the compressor (1) is controlled into the pressure at expulsion (Pd) and pressure of inspiration(Pi) (Ps) for making the compressor (1)
It is limited in the range of envelope figure line (CV1, CV2), the envelope figure line (CV1, CV2) is substantially cut off in two opposite angles
Rectangle and by following lines part lines or whole lines define: it is corresponding with the high pressure limit ratio of the pressure ratio limit value
High pressure ratio fit line (C-B), pressure at expulsion upper limit line corresponding with independent pressure at expulsion limit value (Pd-t1) of the upper limit is belonged to
(B-A), pressure of inspiration(Pi) upper limit line (A-D) corresponding with independent pressure of inspiration(Pi) limit value (Ps-t1) of the upper limit is belonged to and the pressure ratio
It is the corresponding low-pressure ratio fit line (D-E) of the low pressure limit ratio of limit value, right with the independent pressure at expulsion limit value (Pd-t2) that belongs to lower limit
The pressure at expulsion lower limit line answered and pressure of inspiration(Pi) lower limit corresponding with independent pressure of inspiration(Pi) limit value (Ps-t2) of lower limit is belonged to
Line (E-C), wherein the high pressure ratio fit line (C-B) is limited by high pressure ratio critical curve equation, the low-pressure ratio fit line
(D-E) it is limited by low-pressure ratio critical curve equation.
8. control method according to any one of claim 1 to 4, it is characterised in that:
The compressor (1) is frequency-changeable compressor or positive displacement compressor, and
The step of controlling the operation of the compressor (1) based on pressure ratio comparison result includes: to control institute based on pressure ratio comparison result
State the working frequency or displacement volume of compressor (1).
9. a kind of heat pump unit (100), which is characterized in that the heat pump unit (100) includes compressor (1) and control device,
The control device controls the fortune of the compressor (1) according to control method such as described in any item of the claim 1 to 8
Row.
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| CN201610926986.4A CN106642806B (en) | 2016-10-31 | 2016-10-31 | For controlling the control method and heat pump unit of the operation of compressor |
| CN201811465169.9A CN109654780B (en) | 2016-10-31 | 2016-10-31 | Control method for controlling operation of compressor and heat pump unit |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107091517B (en) * | 2017-06-30 | 2023-09-12 | 珠海格力电器股份有限公司 | Protection control method and device of air conditioner unit and air conditioner unit |
| CN107576019B (en) * | 2017-10-12 | 2019-10-01 | 广东美的暖通设备有限公司 | Air-conditioning system and its pressure ratio control method and control device |
| CN108397375B (en) * | 2018-02-07 | 2019-12-20 | 广东美的暖通设备有限公司 | Compressor control method, air conditioner and storage medium |
| CN109140829B (en) * | 2018-08-13 | 2019-11-19 | 珠海格力电器股份有限公司 | Compressor oil-returning structure, refrigeration unit and air-conditioning system |
| CN109406042B (en) * | 2018-10-24 | 2021-02-09 | 四川长虹空调有限公司 | Pressure data fitting method for variable frequency air conditioner |
| CN112728821B (en) * | 2019-10-14 | 2022-07-08 | 广东芬尼克兹节能设备有限公司 | Compressor ultralow-temperature safe operation control method, device, equipment and storage medium |
| CN110986336A (en) * | 2019-11-28 | 2020-04-10 | 广东志高暖通设备股份有限公司 | Compressor frequency control method and device of air conditioning system |
| CN112781290A (en) * | 2020-04-10 | 2021-05-11 | 青岛海尔新能源电器有限公司 | Heat pump system control method and heat pump system |
| CN111520894B (en) * | 2020-07-03 | 2020-11-27 | 宁波奥克斯电气股份有限公司 | Output control method and device for air conditioner compressor, air conditioner and storage medium |
| CN112797668A (en) * | 2020-12-31 | 2021-05-14 | 青岛海尔空调电子有限公司 | Water-cooled heat pump unit and control method thereof |
| CN113654223B (en) * | 2021-07-19 | 2022-09-06 | 青岛海尔空调器有限总公司 | Method for determining target exhaust gas temperature |
| CN115325630A (en) * | 2022-07-26 | 2022-11-11 | 南京天加环境科技有限公司 | Control method of refrigerating system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109654780A (en) | 2019-04-19 |
| CN106642806A (en) | 2017-05-10 |
| CN109654780B (en) | 2020-04-10 |
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