CN1260529C - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN1260529C CN1260529C CNB2003101230515A CN200310123051A CN1260529C CN 1260529 C CN1260529 C CN 1260529C CN B2003101230515 A CNB2003101230515 A CN B2003101230515A CN 200310123051 A CN200310123051 A CN 200310123051A CN 1260529 C CN1260529 C CN 1260529C
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- operating frequency
- compressor
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Abstract
Provided is an air conditioner capable of securing stable operations of a compressor by smoothly switching torque control and load-corresponded control. When the operation frequency of the compressor is changed and the switching frequency of the torque control and load-corresponded control is included between the operation frequency before changing and the target operation frequency, the switching frequency is maintained for a predetermined time and then controlled again to change to the target operation frequency.
Description
Technical field
The present invention relates to have the air-conditioning of changeable frequency type (capacity variable type) compressor.
Background technology
Controlling the existing air-conditioning of compressor operation by torque, is the variation of load torque during corresponding compressor once rotates, and carries out torque control thereby the output voltage of frequency-converter device is changed.Such air-conditioning quilt for example the spy to open flat 6-311778 communique disclosed.
Under the situation that the compressor operation frequency is reduced, the input current of compressor sharply rises.In order to suppress this phenomenon, be not related with the DC voltage of using to the alternating current or the frequency converter of compressor motor input etc., and make the operating frequency of compressor reduce the velocity ratio slow air-conditioning that gathers way.Such air-conditioning quilt for example the spy to open flat 1-237373 communique disclosed.
In addition, existing air-conditioning also has the spy to open the disclosed air-conditioning of flat 1-75849 communique.
But iff carrying out torque control, on the switching frequency of the corresponding control of load of the torque control of low-speed running scope and high speed operating range, the running of compressor will be unstable or be vibrated.
Summary of the invention
A kind of air-conditioning, operating frequency changeable type compressor, condenser, flow fixed decompressor and evaporimeter couple together by refrigerant tubing successively, and have the frequency converter that makes the compressor operation frequency change,
Operating frequency is when setting is following, the variation of load torque in once rotating according to compressor, the torque control that frequency converter enforcement changes the output voltage of frequency converter, when operating frequency is bigger than described setting, enforcement is transformed to the corresponding control of load of exporting the necessary operating frequency of ability that matches with load
This air-conditioning also has between torque control and the corresponding control of load realizes the control conversion equipment that control is smoothly switched.
Description of drawings
Fig. 1 is the refrigeration cyclic graph of the air-conditioning among embodiments of the invention 1 and the embodiment 2.
Fig. 2 is the time diagram of the compressor operation frequency change of the air-conditioning in the expression embodiments of the invention 1.
Fig. 3 is in the air-conditioning that is illustrated in the embodiments of the invention 1, the curve map of the compressor angular acceleration when the corresponding control of torque control and load is switched.
Fig. 4 is the time diagram of variation of the compressor operation frequency of the air-conditioning of expression in the embodiments of the invention 2.
Fig. 5 is the curve map that the compressor of the air-conditioning in the expression embodiments of the invention 2 flows into the variation of DC current.
Fig. 6 is in the air-conditioning that is illustrated in the embodiments of the invention 2, the curve map of the angular acceleration of the compressor when the corresponding control of torque control and load is switched.
Fig. 7 is the refrigeration cyclic graph of the air-conditioning of embodiments of the invention 3.
Fig. 8 A is the compressor operation frequency of air-conditioning of embodiments of the invention 3 and the transformation period figure of outdoor fan speed.
Fig. 8 B is the figure of angular acceleration of compressor of the air-conditioning of expression embodiments of the invention 3.
Fig. 9 is the refrigeration cyclic graph of the air-conditioning of embodiments of the invention 4.
Figure 10 A is the compressor operation frequency of air-conditioning of embodiments of the invention 4 and the transformation period figure of hp and lp bypass control.
Figure 10 B is the angular acceleration figure of compressor of the air-conditioning of embodiments of the invention 4.
The specific embodiment
The objective of the invention is the problems referred to above, provide a kind of, can guarantee the air-conditioning of the steady running of compressor by torque control and the corresponding control of load are taken over seamlessly at the prior art existence.
Following with reference to the description of drawings embodiments of the invention.
(embodiment 1)
Figure 1 shows that the air-conditioning of embodiments of the invention 1 and embodiment 2.As shown in Figure 1, changeable frequency type (capacity variable type) compressor 11, condenser 12, connect and compose kind of refrigeration cycle in turn by refrigerant line for the capillary 13 and the evaporimeter 14 of flow fixed decompressor.In addition, compressor 11 is driven by frequency converter 17,16 controls of frequency converter 17 controlled devices.Control conversion equipment 15 is made of controller 16, is used to implement the switching of control smoothly of torque control and the corresponding control of load.
In Fig. 1, after cold-producing medium spued from compressor 11, device 12 condensations that are condensed were again by capillary 13 decompressions.Then, cold-producing medium is by evaporimeter 14 evaporation and return compressor 11.Compressor 11 is come the operating frequency command signal control of self-controller 16 to carry out the switching of the corresponding control of torque control and load.
At this, the variation of the load torque during so-called torque control is meant and once rotates according to compressor 11, the control that the output voltage of frequency converter 17 is changed.That is, torque control is to be zero to make the output torque consistent with load torque and feed back to the control that frequency converter is exported in order to make velocity variations.On the other hand, the corresponding control of so-called load is meant the control of the operating frequency that is transformed to refrigerating capacity that output and air-conditioning load match or the necessary compressor 11 of heating capacity.Torque control has the effect that the vibration in compressor 11 low-speed ranges is reduced, and can carry out the optimization of noise or gross efficiency simultaneously.But, thereby needn't carry out torque control more than fixing speed because vibration or noise are to reduce.On the contrary, if carry out torque control, then the inflow DC current of compressor 11 increases, and repeats start and stop continually owing to overcurrent.Therefore, generally be in low-speed range, to carry out torque control, in the high speed scope, then carry out the corresponding control of load.
Fig. 2 is the time diagram of variation of operating frequency of compressor 11 of the air-conditioning of expression embodiments of the invention 1.
In Fig. 2, transverse axis is represented the time, and the longitudinal axis is represented the operating frequency of compressor 11.The situation of solid line 22 expressions raising operating frequency of compressor 11, the situation of dotted line 23 expressions reduction compressor 11 operating frequencys.As shown in Figure 2, air-conditioning of the present invention carries out the switching of above-mentioned torque control and the corresponding control of load at the regulation switching frequency F1 of off-resonance frequency.In the occasion that increases or reduce the operating frequency of compressor 11, the control method difference before and after switching frequency F1.
Therefore, in embodiment 1, increase or when reducing the operating frequency of compressor 11, by switching frequency F1 the time, make the operating frequency of compressor 11 on switching frequency F1, keep the stipulated time.And then carry out the running of compressor 11, make operating frequency be changed to the target operating frequency, thereby the level and smooth control that realizes torque control and the corresponding control of load is switched.That is, the controller 16 of Fig. 1 constitutes the control conversion equipment 15 of the level and smooth control switching of carrying out torque control and the corresponding control of load.
The angular acceleration of the compressor 11 when Figure 3 shows that the switching of the corresponding control of torque control and load.In Fig. 3, transverse axis is represented the operating frequency of compressor 11, and the longitudinal axis is represented angular acceleration.The occasion of the embodiment 1 that dotted line 24 expressions are illustrated in figures 1 and 2, solid line 25 expressions do not keep the occasion of stipulated time on switching frequency.Shown in the solid line 25 of Fig. 3, on switching frequency, do not keep the occasion of stipulated time, when the operating frequency of compressor 11 was positioned near the switching frequency F1, angular acceleration rose.On the other hand, shown in dotted line 24, in embodiment 1, even near the operating frequency of compressor 11 switching frequency F1 the time, angular acceleration does not rise yet.That is, when torque control and load correspondence control switching, make it keep the stipulated time by running compressor 11, and then change to the target operating frequency, can carry out the switching of torque control and load correspondence control smoothly at switching frequency F1.Therefore, can suppress the vibration of compressor 11, and guarantee the steady running of compressor 11.
(embodiment 2)
Fig. 4 is the time diagram of the variation of the operating frequency of the compressor 11 of the air-conditioning of expression embodiments of the invention 2.
In Fig. 4, transverse axis is represented the time, and the longitudinal axis is represented the operating frequency of compressor 11.The occasion of solid line 26 expressions raising operating frequency of compressor 11, the occasion of dotted line 27 expressions reduction compressor 11 operating frequencys.Shown in the solid line 26 of Fig. 4, in embodiment 2, under the situation that the operating frequency that makes compressor 11 rises, the operating frequency of compressor 11 does not keep the stipulated time just to rise to the target operating frequency on switching frequency F1.On the other hand, shown in dotted line 27, in the occasion that the operating frequency that makes compressor 11 reduces, the running of following enforcement compressor 11 promptly, makes the operating frequency of compressor 11 keep the stipulated time on switching frequency F1, and then is reduced to the target operating frequency.
Fig. 5 is illustrated in when switching torque control and the control of load correspondence, the variation of the DC current of the frequency converter 17 of inflow drive compression machine 11.In Fig. 5, transverse axis is represented the operating frequency of compressor 11, and the longitudinal axis represents to flow into the DC current of the frequency converter 17 of drive compression machine 11.In addition, make the situation of the operating frequency rising of compressor 11 among the solid line 28 expression embodiment 2, make the situation of the operating frequency rising of compressor 11 among the dotted line 29 expression embodiment 1.Current value I p represents the allowable current value of controller 16.
Shown in solid line 28, when the operating frequency of compressor 11 was risen, the condensing pressure of kind of refrigeration cycle and the pressure differential of evaporating pressure were little, thereby the inflow DC current of compressor 11 is smaller, and with the difference of the allowable current Ip of controller 16 greatly, enough and to spare arranged.But, keeping the occasion of stipulated time at switching frequency F1, the switching of the corresponding control of torque control and load can smoothly be carried out, and on the other hand, internal pressure rises during the switching frequency F1 maintenance stipulated time.Therefore, shown in dotted line 29, the DC current that flows into compressor 11 rises on the contrary.As a result, may occur near or surpass the situation of controller 16 allowable current value Ip.
On the other hand, when making the operating frequency decline of compressor 11, the condensing pressure of kind of refrigeration cycle and the pressure differential of evaporating pressure are big, thereby the DC current of inflow compressor 11 is big.Therefore, make it keep the stipulated time by running compressor 11, and then make it be reduced to the target operating frequency, can carry out the switching of the corresponding control of torque control and load smoothly at switching frequency F1.Like this, can suppress the vibration of compressor 11, and guarantee the steady running of compressor 11.
Figure 6 shows that the angular acceleration of compressor 11 when the switching of torque control and the corresponding control of load.In Fig. 6, transverse axis is represented the operating frequency of compressor 11, and the longitudinal axis is represented the angular acceleration of compressor 11.
In Fig. 6, dotted line 30 is the situations that make the operating frequency rising of compressor 11, and expression makes its operating frequency keep the situation of stipulated time at switching frequency F1.Dotted line 31 is situations that compressor 11 operating frequencys are risen, and represents that its operating frequency does not keep the situation of stipulated time on switching frequency F1.Solid line 32 is the situations that make the operating frequency decline of compressor 11, represents that its operating frequency does not keep the situation of stipulated time on switching frequency F1.Can find out from dotted line 30 and dotted line 31, under the situation that the operating frequency that makes compressor 11 rises, no matter be to make compressor 11 keep under the situation of stipulated time at switching frequency F1 or do not keeping under the situation of stipulated time, do not seeing all on the angular acceleration that big variation is arranged.But, bigger gap arranged in that the situation that compressor 11 operating frequencys are descended is next.Therefore, under the situation that the operating frequency that makes compressor 11 reduces, switching frequency F1 in torque control and the corresponding control of load keeps the stipulated time by the operating frequency that makes compressor 11 on switching frequency F1, can carry out the switching of the corresponding control of torque control and load smoothly.Can suppress the vibration of compressor 11 like this.And can reduce the inflow DC current of compressor 11, and can prevent the start and stop of repetition continually that in the operation process of compressor 11, cause owing to overcurrent.
(embodiment 3)
The embodiment 3 of the air-conditioning of the present patent application at first is described by Fig. 7, Fig. 8 A and Fig. 8 B.
Fig. 7 is the refrigeration cyclic graph of the air-conditioning of embodiments of the invention 3.In Fig. 7, after cold-producing medium spues from compressor 11, by condensation in the condenser 12, by as capillary 13 decompression of flow fixed decompressor, after evaporimeter 14 is evaporated, return compressor 11.Controller 16 changes the operating frequency of compressor 11 according to the running indication.Specifically, compressor 11 is driven by frequency converter 17, and frequency converter 17 is by controller 16 controls.Fan 18 is arranged near the condenser 12, is used for promoting the heat exchange of condenser 12.Controller 16 is also controlled the rotation of fan 18.Control conversion equipment 15 is made of controller 16 and fan 18, is used to implement the level and smooth control switching of torque control and the corresponding control of load.In addition, fan 18 also can be arranged near the evaporimeter 14, is used to promote the heat exchange of evaporimeter 14.
Compressor 11 is come the operating frequency command signal control of self-controller 16, carries out the switching of the corresponding control of torque control and load.
Fig. 8 A is the transformation period figure of the rotating speed (rotary speed) of the operating frequency of compressor 11 of embodiments of the invention 3 and fan 18.In Fig. 8 A, transverse axis is represented the time, and the longitudinal axis is represented the operating frequency of compressor 11 and the rotating speed of fan 18.The operating frequency of solid line 33 expression compressors 11 changes, the change in rotational speed of solid line 34 expression fans 18.The operating frequency of compressor 11 is the line of demarcation with switching frequency HZ1, implements the corresponding control of load in high-frequency, implements torque control in low frequency.This switching frequency HZ1 is identical with switching frequency F1 among embodiment 1 and the embodiment 2.
Shown in solid line 34, for control transformation energy when the operating frequency that makes compressor 11 rises and descend enough smoothly carries out, 16 pairs of fans 18 of controller are controlled, and make relatively rotating speed at the fan 18 of the corresponding control area of load, increase at the rotating speed of the fan 18 of torque control area.That is, in embodiment 3, the control conversion equipment 15 of implementing the level and smooth control switching of the corresponding control of torque control and load is made of controller 16 and fan 18.
Fig. 8 B is the angular acceleration ideograph of compressor 11.In Fig. 8 B, transverse axis is represented the operating frequency of compressor 11, and the longitudinal axis is represented the angular acceleration of compressor 11.The angular acceleration change of the compressor 11 among the solid line 35 expression embodiment 3, the angular acceleration change of the compressor 11 in the existing mode of wave-like line 36 expressions.In embodiment 3, carry out following control, at the switching frequency HZ1 of torque control and the corresponding control of load, the outdoor fan speed of torque control area is improved in the corresponding control area of load relatively.Like this, shown in solid line 35, can carry out the switching of the corresponding control of torque control and load smoothly, and can suppress compressor 11 vibration, guarantee the steady running of compressor 11.
(embodiment 4)
The embodiment 4 of the air-conditioning of the present patent application below is described by Fig. 9, Figure 10 A and Figure 10 B.Fig. 9 is the refrigeration cyclic graph of the air-conditioning of embodiments of the invention 4.In Fig. 9, after cold-producing medium spues from compressor 11, by condenser 12 condensations.After evaporating, return compressor 11 at condenser 12 condensed cold-producing mediums for capillary 13 decompressions of flow fixed decompressor and by evaporimeter 14.The exhaust end of compressor 11 and suction side are communicated with by bypass pipe 19, and the centre installs switch valve 20 additional.That is, but be connected with the suction side with the exhaust end of compressor 11 by bypass pipe 19 as the switch valve 20 of the switching device of free switch.Controller 16 changes the operating frequency of compressor 11 according to the running indication.In addition, compressor 11, condenser 12 and evaporimeter 14 are connected by cross valve 21.Control conversion equipment 15 is by controller 16, for but the switch valve 20 and the bypass pipe 19 of the switching device of free switch constitutes, and the level and smooth control that is used to implement torque control and the corresponding control of load is switched.
Compressor 11 is come the operating frequency command signal control of self-controller 16, carries out the switching of the corresponding control of torque control and load.
Figure 10 A is the operating frequency of compressor 11 of embodiments of the invention 4 and the transformation period figure of the hp and lp bypass control undertaken by switch valve 20.The operating frequency of solid line 37 expression compressors 11, the switch situation of solid line 38 expression switch valves 20.Switching frequency HZ1 with torque control and the corresponding control of load is the line of demarcation, and the operating frequency higher than switching frequency HZ1 is the corresponding control area of load, and the operating frequency lower than switching frequency HZ1 is the torque control area.Shown in solid line 37 and solid line 38, under the situation that the operating frequency that makes compressor 11 descends, switching frequency HZ1 with corresponding control range of load and torque control range is a threshold value, and in the time of in operating frequency enters the torque control area, switch valve 20 is opened in controller 16 controls.After opening the stipulated time, controller 16 gauge tap valves 20 close.Like this, the exhaust end of compressor 11 and the pressure differential of suction side obtain rapidly relaxing the load reduction of compressor 11.Like this, controller 16 is controlled, and makes bypass official hour between high-low pressure.
Figure 10 B is the angular acceleration ideograph of compressor 11.In Figure 10 B, transverse axis is represented the operating frequency of compressor 11, and the longitudinal axis is represented the angular acceleration of compressor 11.Angular acceleration under the situation of the switch control of solid line 39 expressions carrying out switch valve 20, the angular acceleration under the situation of the switch control of dotted line 40 expressions not carrying out switch valve 20.
Shown in dotted line 40, existing air-conditioning is under the situation that the operating frequency that makes compressor 11 reduces, and the angular acceleration change is very big.On the other hand, shown in solid line 39, under the situation that the operating frequency that makes compressor 11 reduces, be threshold value with torque control and the corresponding switching frequency HZ1 that controls of load, when operating frequency enters the torque control area, suppress the variation of angular acceleration by making bypass official hour between high-low pressure.That is, in embodiment 4, can carry out the switching of the corresponding control of torque control and load smoothly, can suppress the vibration of compressor 11, and can simplify the vibration-proof structure of body.That is, in embodiment 4, but implement control conversion equipment 15 that the level and smooth control of torque control and the corresponding control of load switches by controller 16, constitute as the switch valve 20 and the bypass pipe 19 of the switching device of free switch.
Formation of the present invention can produce the following effect of putting down in writing as mentioned above.
According to the present invention, when the operating frequency change of compressor 11, at least under the situation of the switching frequency that comprises torque control and the corresponding control of load between before changing operating frequency and the target operating frequency, can carry out following control, promptly, make this switching frequency keep the stipulated time, and then make it change to the target operating frequency.Like this, the switching of the corresponding control of torque control and load can be carried out smoothly, and near the switching frequency of torque control and the corresponding control of load, the FREQUENCY CONTROL of stable compressor 11 can be realized.
In addition, when operating frequency reduces, carry out this control at least, thereby the inflow DC current of compressor 11 can diminish also, and can prevent the start and stop of repetition continually that in the operation process of compressor 11, cause owing to overcurrent.
In addition, according to the present invention, when operating frequency descends, when operating frequency enters the torque control range through switching frequency, can control and make bypass official hour between high-low pressure.Like this, near the switching frequency of torque control and the corresponding control of load, can realize more stable compressor frequency control, and can simplify the vibration-proof structure of body.
As previously discussed,, the switching of the corresponding control of torque control and load can be carried out smoothly, the steady running of compressor can be guaranteed according to the air-conditioning of the present patent application.
Claims (5)
1. air-conditioning, operating frequency changeable type compressor, condenser, flow fixed decompressor and evaporimeter couple together by refrigerant tubing successively, and have the frequency converter that the operating frequency that makes described compressor changes,
When described operating frequency when setting is following, the variation of load torque in once rotating according to described compressor, the torque control that described frequency converter enforcement changes the output voltage of described frequency converter, when described operating frequency is bigger than described setting, enforcement changes to the corresponding control of load of exporting the necessary operating frequency of ability that matches with load
It is characterized in that this air-conditioning also has between described torque control and the corresponding control of described load carries out the control conversion equipment that level and smooth control is switched.
2. air-conditioning as claimed in claim 1 is characterized in that, described control conversion equipment has controller,
Described controller makes operating frequency after keeping the stipulated time on the described setting when making operating frequency variation and the described setting of process, changes to the target operating frequency again.
3. air-conditioning as claimed in claim 1 is characterized in that, described control conversion equipment has controller,
When operating frequency from high-frequency during to the transition of low frequency direction, described controller makes operating frequency after described setting keeps the stipulated time, changes to the target operating frequency again,
When operating frequency from low frequency during to the transition of high-frequency direction, described controller makes operating frequency not keep the stipulated time just to change to the target operating frequency at described setting.
4. air-conditioning as claimed in claim 1 is characterized in that, described control conversion equipment has controller, promote the fan of any one at least heat exchange in the middle of described condenser and the described evaporimeter,
The rotating speed height of the described fan when described controller makes the rotating ratio of the described fan when carrying out the corresponding control of described load carry out described torque control.
5. air-conditioning as claimed in claim 1 is characterized in that, described control conversion equipment has controller, makes the exhaust end of described compressor and the bypass pipe that the suction side switch freely is communicated with by switching device,
In the occasion that the operating frequency of described compressor changes to the reduction direction that comprises setting, described controller makes described switching device open stipulated time when the operating frequency of described compressor is crossed described setting.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003174637 | 2003-06-19 | ||
| JP2003174637A JP4027273B2 (en) | 2003-06-19 | 2003-06-19 | Air conditioner |
| JP2003295120 | 2003-08-19 | ||
| JP2003295120A JP3979361B2 (en) | 2003-08-19 | 2003-08-19 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1573248A CN1573248A (en) | 2005-02-02 |
| CN1260529C true CN1260529C (en) | 2006-06-21 |
Family
ID=34525351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101230515A Expired - Fee Related CN1260529C (en) | 2003-06-19 | 2003-12-23 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1260529C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7481069B2 (en) * | 2005-07-28 | 2009-01-27 | Carrier Corporation | Controlling a voltage-to-frequency ratio for a variable speed drive in refrigerant systems |
| CN103856143B (en) * | 2014-01-18 | 2016-07-27 | 江西江特电气集团有限公司 | The adjustment control method of the given safe operation frequency of converter overclocking |
-
2003
- 2003-12-23 CN CNB2003101230515A patent/CN1260529C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1573248A (en) | 2005-02-02 |
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Granted publication date: 20060621 Termination date: 20161223 |