CN105157295A - Refrigeration system and control method and control device thereof - Google Patents
Refrigeration system and control method and control device thereof Download PDFInfo
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- CN105157295A CN105157295A CN201510674086.0A CN201510674086A CN105157295A CN 105157295 A CN105157295 A CN 105157295A CN 201510674086 A CN201510674086 A CN 201510674086A CN 105157295 A CN105157295 A CN 105157295A
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Abstract
The invention provides a refrigeration system and a control method and control device thereof. The control method comprises the steps that detection parameters are obtained; whether the detection parameters meet state setting conditions or not is judged; if yes, a controller judges that the system is in the state and transmits a corresponding instruction. According to the technical scheme, the relationship between key parameters related to the working state of the refrigeration system and detection parameters easy to obtain directly is utilized, the working state of the refrigeration system is judged, and then corresponding control is conducted according to the working state. The refrigeration system and the control method and control device thereof have the advantages that detection elements used for detecting the working states of refrigeration systems in the prior art such as high-voltage switches, low-voltage switches, leeway switches and environmental temperature sensors are omitted, the size of the refrigeration system is reduced to a great extent, and the miniaturization of the refrigeration system is facilitated; compared with the detection conducted by detection elements of the prior art, through the control method, higher accuracy and reliability are achieved, the response speed is higher, and the cost is lower.
Description
Technical field
The present invention relates to art of refrigeration units.A specifically control method for refrigeration system, also relates to a kind of control system of refrigeration system, and a kind of refrigeration system.
Background technology
Along with the development of Refrigeration Technique, refrigeration plant has been widely used in the productive life of the mankind.Such as air-conditioning, refrigerator and freezer unit etc.
In refrigeration systems, evaporimeter, condenser, compressor and choke valve are absolutely necessary four large parts.Wherein evaporimeter is the equipment of conveying cold, and cold-producing medium evaporates wherein, and (boiling) becomes steam, thus the heat absorbing cooled object realizes refrigeration.Compressor is whole refrigeration system " heart ", is ceaselessly rotated by motor run, is the power source of kind of refrigeration cycle, plays a part suction, compression, refrigerant conveying steam.Condenser is exothermic equipment, the heat absorbed is passed to cooling medium together with the heat that compressor work transforms take away in evaporimeter, makes high-temperature high-pressure refrigerant steam cool, be condensed into the refrigerant liquid of high normal pressure and temperature.Choke valve plays reducing pressure by regulating flow effect to cold-producing medium, controls and regulate the quantity flowing into refrigerant liquid in evaporimeter simultaneously, and system is divided into high-pressure side and low-pressure side two large divisions.
In practical refrigeration system, in order to improve the economy of operation, reliability and security, except above-mentioned four large parts, refrigeration system is provided with some auxiliary equipment usually, as magnetic valve, distributor, drier, heat collector, fusible plug, pressure controller etc.
For security consideration, necessary protection need be carried out to refrigeration system; The control system of existing refrigeration system need realize the judgement to refrigeration system duty by the pressure or temperature arranging the detection correspondence positions such as high-voltage switch gear, low tension switch, leeway switch and environment temperature sensor.Design like this, owing to arranging too much switch, result in whole refrigeration system volume large, quality weight, and the protection system reliability of multiple components and parts composition is not high.
Summary of the invention
The invention provides a kind of control method of refrigeration system, carry out detection with the multiple components and parts of the control system solving existing refrigeration system and can carry out judgement and cause whole refrigeration system quality weight, the problem that volume is large and reliability control system is not high.
For solving the problems of the technologies described above, the control method of a kind of refrigeration system provided by the invention, it comprises:
Obtain detected parameters;
Whether match state imposes a condition to judge detected parameters;
If so, then controller judges to be in this state and sends corresponding instruction.
Optionally, control method comprises:
Obtain compressor current;
Judge whether compressor current is less than compressor first setting value within the t1 time;
If so, then controller judges refrigrant leakage and sends corresponding control instruction;
If not, judge whether compressor current is greater than compressor second setting value within the t2 time;
If so, then controller judges refrigerant circulation loop blocking or/and compressor fault send corresponding control instruction.
Optionally, described acquisition compressor current comprises:
Send and obtain compressor current request,
Receive the compressor current that the request of driven compressor module responds sends;
And/or receive the compressor current of driven compressor module timed sending.
Optionally, comprising:
Obtain the temperature being arranged at temperature sensor on compressor suction duct;
Judge whether temperature is less than temperature first setting value within the t3 time;
If so, then controller judges that refrigerating medium leaks and sends corresponding control instruction;
If not, judge whether temperature is greater than temperature second setting value within the t4 time;
If so, then controller judges that refrigerant temperature is too high sends corresponding control instruction.
Optionally, comprising:
Obtain pump electromechanics stream;
Judge whether pump electromechanics stream is less than pump machine first setting value at setting-up time t5;
If so, then controller judges that refrigerating medium is revealed and sends corresponding control instruction;
If not, judge whether pump electromechanics stream is greater than pump machine second setting value at setting-up time t6;
If so, then controller judges the blocking of refrigerating medium closed circuit or/and pump machine fault send corresponding control instruction.
Optionally, comprising:
Obtain blower fan electric current;
Judge whether blower fan electric current is greater than blower fan setting value in setting-up time t7;
If so, then controller judges fan trouble and sends corresponding control instruction.
Optionally, comprising:
Obtain supply voltage;
Judge voltage whether within the scope of voltage setting value;
If so, then controller judges that supply voltage is normal and sends corresponding control instruction;
If not, then controller judges power supply overvoltage or under-voltage and send corresponding control instruction.
The control device of a kind of refrigeration system provided by the invention, comprising:
Detected parameters acquiring unit, for obtaining detected parameters;
Judging unit, according to detected parameters, whether match state imposes a condition judges whether to be in this duty;
Control unit, sends corresponding instruction according to judging unit result of determination.
Optionally, comprising:
Compressor current acquiring unit, for obtaining compressor current;
Compressor current judging unit, it comprises,
Whether the first compressor current judging unit, be less than compressor first setting value according to compressor current and judge whether cold-producing medium leaks within the t1 time;
Whether the second compressor current judging unit, be greater than compressor second setting value according to compressor current and judge whether refrigerant circulation loop blocking or compressor fault within the t2 time;
And compressor current control unit, send corresponding control instruction according to the judged result of compressor current judging unit.
Optionally, comprising:
Temperature acquiring unit, for obtaining the temperature of the temperature sensor be placed on compressor suction duct;
Temperature judging unit, it comprises,
Whether the first temperature judging unit, be less than temperature first setting value according to temperature and judge whether refrigerating medium leaks within the t3 time;
Whether the second temperature judging unit, be greater than temperature second setting value according to temperature and judge refrigerating medium whether temperature is too high within the t4 time;
Temperature control unit, sends corresponding control instruction according to the result of temperature judging unit.
A kind of refrigeration system provided by the invention, comprises the control device of the refrigeration system described in above-mentioned any one.
Technique scheme of the present invention has the following advantages compared to existing technology:
1, the control method of a kind of refrigeration system provided by the invention, it utilizes the relation between the key parameter relevant to refrigeration system duty and the detected parameters easily directly obtained, judge the duty of this refrigeration system, then make corresponding control according to duty.First this control method is saved in prior art for detecting high-voltage switch gear, low tension switch, the Detection theory device such as leeway switch and environment temperature sensor of refrigeration system duty, save the volume of refrigeration system largely, be convenient to refrigeration system miniaturization.Secondly, this control method compared with the Detection theory units test degree of accuracy of prior art and reliability higher, response speed is faster, and cost is lower.
2, the control method of a kind of refrigeration system provided by the invention, it utilizes the relation between compressor current and other parameters, judges the duty of this refrigeration system.By the detection to compressor current, just can realize to condenser dirty stifled, environment temperature is too high and the judgement of refrigrant leakage problem, thus the corresponding protection of control realization.This control method eliminates high-voltage switch gear, low tension switch, leeway switch, environment temperature sensor etc. for judging the components and parts of refrigeration system duty (condenser dirty stifled, environment temperature is too high and refrigrant leakage problem), decrease the volume and weight of this refrigeration system, improve the reliability of this refrigeration system largely.
3, the control method of a kind of refrigeration system provided by the invention, it utilizes the relation between refrigeration system air intake duct temperature and other parameters, judges the duty of this refrigeration system.This control method can dispense low tension switch and reach same and leak refrigerating medium and the judgement effect of temperature, and then control realization is protected accordingly.This control method decreases the volume and weight of this refrigeration system, improves the reliability of this refrigeration system largely.
3, the control method of a kind of refrigeration system provided by the invention, it utilizes the relation between pump electromechanics stream and other parameters, judges the duty of this refrigeration system.By the detection to main frame pump electromechanics stream, the judgement to water line block, water route seepy question can be realized.Thus eliminate water flow switch, water level switch.Decrease the volume and weight of this refrigeration system, improve the reliability of this refrigeration system largely.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the fundamental diagram of a kind of micro climate human body cooling device provided by the invention;
Fig. 2 is the flow chart A of a kind of control method of refrigeration provided by the invention;
Fig. 3 is the flow chart B of a kind of control method of refrigeration provided by the invention;
Fig. 4 is the flow chart C of a kind of control method of refrigeration provided by the invention;
Fig. 5 is the flow chart D of a kind of control method of refrigeration provided by the invention;
Fig. 6 is the flow chart F of a kind of control method of refrigeration provided by the invention;
Fig. 7 is the flow chart G of a kind of control method of refrigeration provided by the invention.
In figure, Reference numeral is expressed as: 1-liquid-cooled suit, 2-water tank, 3-evaporimeter, 4-throttling arrangement, 5-condenser, 6-blower fan, 7-compressor, 8-temperature sensor, 9-pump machine.
Detailed description of the invention
Fig. 1 to Fig. 7 illustrates the embodiment of the control method of a kind of refrigeration system provided by the invention.
The control method of a kind of refrigeration system provided by the invention may be used for any refrigeration system.This technical scheme for convenience of description, the present embodiment is described in detail the control method of this refrigeration system based on the refrigeration system of the micro climate human body cooling device shown in Fig. 1, but the present invention is not limited to this refrigeration system.
Figure 1 shows that a kind of refrigeration work schematic diagram of refrigeration system.As can be seen from Figure 1, compressor 7, condenser 5, throttling arrangement 4, evaporimeter 3 and compressor 7 are in turn connected to form the first closed circuit by pipeline structure, are cold-producing medium in this first closed circuit.Evaporimeter 3, liquid-cooled suit 1, water tank 2, pump machine 9 and evaporimeter 3 are connected to form the second closed circuit successively by pipeline structure, are refrigerating medium in this second closed circuit.This refrigeration system also comprises the blower fan 6 acting on described condenser 5, is arranged at the temperature sensor 8 on described compressor 7 air inlet.
Described refrigeration system comprises the control system controlling this refrigeration system and run, and this control system comprises controller and driven compressor module, and shows the display unit of this refrigeration system running status.Described controller controls compressor 7 by driven compressor module, and this controller directly controls blower fan 6 and pump machine 9.
In the present embodiment, described display unit is indicator lamp, specifically comprises power supply indicator, run indicator, alarm lamp.According to LED status, the state of refrigeration system can be understood in real time.When unusual condition appears in refrigeration system, user can make countermeasure rapidly, avoids damage device.
This control system is also provided with buzzer for reporting to the police or loudspeaker.
For security consideration, this refrigeration system need to condenser dirty stifled, environment temperature is too high, coolant leakage etc. major issue realize protection automatically, therefore most important to the detection of refrigeration system duty.The invention provides a kind of control method of refrigeration.Please refer to Fig. 2, the control method of this refrigeration system comprises the following steps:
Step S101: obtain detected parameters;
Step S102: whether match state imposes a condition to judge detected parameters;
Step S103: if so, then controller judges to be in this state and sends corresponding instruction.
This control method utilizes the relation between the key parameter relevant to refrigeration system duty and the detected parameters easily directly obtained, and judges the duty of this refrigeration system, then makes corresponding control according to duty.First this control method is saved in prior art for detecting high-voltage switch gear, low tension switch, the Detection theory device such as leeway switch and environment temperature sensor of refrigeration system duty, save the volume of refrigeration system largely, be convenient to refrigeration system miniaturization.Secondly, this control method is higher compared with the Detection theory units test degree of accuracy of prior art, and corresponding speed is faster, and cost is lower.
Particularly: please refer to Fig. 3, the control method of this refrigeration system comprises:
Step S201: obtain compressor current.
The method obtaining compressor current specifically comprises:
Send and obtain compressor current request,
Receive the compressor current that the request of driven compressor module responds sends;
And/or receive the compressor current of driven compressor module timed sending.
Described driven compressor module can Real-time Collection by the compressor current of compressor 7.Driven compressor module timing can send compressor current to controller, also the request of response controller can send compressor current to controller.Described controller can judge the running status of this refrigeration system according to this current value.
Step S202: judge whether compressor current is less than compressor first setting value within the t1 time.
Step S203: if so, then controller judges refrigrant leakage and sends corresponding control instruction.
The leakage of cold-producing medium can cause the refrigerant pressure in the first closed circuit to reduce, and refrigerant pressure and compressor current exist positively related functional relation.Therefore, when controller detects that compressor current is all less than compressor the first setting value in setting-up time t1, refrigrant leakage can be judged.Then this controller sends corresponding control instruction.This control instruction comprises notification instruction and reply instruction, and namely so-called notification instruction controls display unit and provide and notify prompting accordingly, and such as, control display unit display corresponding informance, and/or buzzer or loudspeaker are sounded, and inform user.Namely so-called reply instruction passes through the start and stop controlling corresponding parts, so that follow-up repair and maintenance.
Step S204: if not, judges whether compressor current is greater than compressor second setting value within the t2 time.
Step S205: if so, then controller judges refrigerant circulation loop blocking or/and compressor fault send corresponding control instruction.
When blocking appears in refrigerant circulation loop, refrigerant pressure can be caused seriously to exceed normal operation range (more than 10 times), and there is positively related functional relation in refrigerant pressure and compressor current.According to this characteristic, according to compressor current, controller can judge whether refrigerant circulation loop blocks.Equally, compressor current can be caused when compressor breaks down significantly to increase, when compressor current is higher than certain value or scope, controller can judge that compressor breaks down problem.
Because judgment mode is identical, counter-measure is substantially identical, in the present embodiment, to be imposed a condition judgement two states by a state, does not do concrete differentiation to two states.Namely " refrigerant circulation loop blocking is or/and compressor fault " can see a kind of state as.
Control instruction comprises notification instruction and reply instruction, and namely so-called notification instruction controls display unit and provide and notify prompting accordingly, and such as, control display unit display corresponding informance, and/or buzzer or loudspeaker are sounded, and inform user.So-called reply instruction namely by changing compressor 7 rotating speed, connect or disconnect the infringement that the modes such as refrigeration system power supply prevent from causing because compressor current is too high compressor or other parts.
As another kind of embodiment, according to above-mentioned operation principle, multiple state can be set and impose a condition and judge whether refrigerant circulation loop blocks respectively and whether break down with compressor.
As another kind of embodiment, also can judge that whether environment temperature is too high by compressor current.When environment temperature is too high, refrigerant pressure can higher than normal operation range (less than 10 times).According to this characteristic, by the monitoring to compressor real-time current, thus can judge that environment temperature is too high.If when environment temperature is too high, controller sends corresponding control instruction.
Known by foregoing description, the present invention by compressor current and and the contrast of compressor setting value, the automatic detection of dirty stifled, the environment temperature of refrigrant leakage, condenser being crossed to the problems such as high can be realized, thus realize automatic protection comparatively fast and accurately.The technical program eliminates in prior art as realizing high-voltage switch gear, low tension switch, leeway switch and environment temperature sensor etc. that identical function is arranged, reduce the volume and weight of this control system largely, and improve reliability and the response speed of control system.
According to same principle, by Real-Time Monitoring arrange temperature sensor 8 on compressor 7 air intake duct temperature, pump electromechanics stream and blower fan electric current, the duty of refrigeration system can be judged more all sidedly.Temperature sensor 8, pump machine 9 are directly connected with controller with blower fan 6, and therefore controller directly can get temperature, pump electromechanics stream and blower fan electric current.
Particularly, please refer to Fig. 4, this control method also comprises:
Step S301: obtain the temperature being arranged at temperature sensor on compressor suction duct;
Step S302: judge whether temperature is less than temperature first setting value within the t3 time;
Step S303: if so, then controller judges that refrigerating medium leaks and sends corresponding control instruction;
Step S304: if not, judges whether temperature is greater than temperature second setting value within the t4 time;
Step S305: if so, then controller judges that refrigerant temperature is too high and sends corresponding control instruction;
When leaking appears in refrigerating medium, the temperature of temperature sensor 8 then can reduce, and according to these correlation properties, when controller detects that temperature is less than temperature the first setting value in setting-up time t3, can judge that refrigerating medium leaks.Then this controller sends corresponding control instruction.This control instruction comprises notification instruction and reply instruction.The technical program provide control method can dispense low tension switch of the prior art and reach same protected effect.
Please refer to Fig. 5, this control method also comprises:
Step S401: obtain pump electromechanics stream;
Step S402: judge whether pump electromechanics stream is less than pump machine first setting value at setting-up time t5;
Step S403: if so, then controller judges that refrigerating medium is revealed and sends corresponding control instruction;
Step S404: judge whether water pump electric current is greater than pump machine second setting value at setting-up time t6;
Step S405: if so, judge that the blocking of refrigerating medium closed circuit is or/and pump machine fault send corresponding instruction;
With above-mentioned compressor, this judgement principle judges that principle is identical, repeat no more.Above-mentioned steps by pump electromechanics stream detection, can realize to water line block, refrigerating medium leak protection.Thus eliminate water flow switch of the prior art, water level switch, leak proterctive equipment, reduces the volume and weight of this control system largely, and improves reliability and the response speed of control system.
Please refer to Fig. 6, this control method also comprises:
Step S501: obtain blower fan electric current;
Step S502: judge whether blower fan electric current is greater than blower fan setting value in setting-up time t7;
Step S503: if so, then controller judges fan trouble and sends corresponding control instruction.
With above-mentioned compressor, this judgement principle judges that principle is identical, repeat no more.
Please refer to Fig. 7, this control method also comprises:
Step S601: obtain supply voltage;
Step S602: judge voltage whether within the scope of voltage setting value;
Step S603: if so, then controller judges that supply voltage is normal and sends corresponding control instruction;
Step S604: if not, then controller judges power supply overvoltage or under-voltage and send corresponding control instruction.
This control method is for detecting the state of cold-producing medium power supply.
Correlation between above-mentioned duty and setting value is general for refrigeration system of the same type, and for specific refrigeration system, above-mentioned setting value draws by test data.Wherein, above-mentioned setting value can be concrete numerical value, also can be interval.
Correspondingly, the present invention provides a kind of control device of refrigeration system simultaneously, and this control device comprises:
Detected parameters acquiring unit, for obtaining detected parameters;
Judging unit, according to detected parameters, whether match state imposes a condition judges whether to be in this duty;
Control unit, sends corresponding instruction according to judging unit result of determination.
Optionally, control device comprises:
Compressor current acquiring unit, for obtaining compressor current;
Compressor current judging unit, it comprises, the first compressor current judging unit, within the t1 time, whether is less than compressor first setting value judges whether cold-producing medium leaks according to compressor current;
Whether the second compressor current judging unit, be greater than compressor second setting value according to compressor current and judge whether refrigerant circulation loop blocking or compressor fault within the t2 time;
And compressor current control unit, send corresponding control instruction according to the judged result of compressor current judging unit.
Optionally, comprising:
Temperature acquiring unit, for obtaining the temperature of the temperature sensor be placed on compressor suction duct;
Temperature judging unit, it comprises,
Whether the first temperature judging unit, be less than temperature first setting value according to temperature and judge whether refrigerating medium leaks within the t3 time;
Whether the second temperature judging unit, be greater than temperature second setting value according to temperature and judge refrigerating medium whether temperature is too high within the t4 time;
Temperature control unit, sends corresponding control instruction according to the result of temperature judging unit.
The present invention provides a kind of refrigeration system simultaneously, and it comprises the control device of the refrigeration system described in above-mentioned any one.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (11)
1. a control method for refrigeration system, is characterized in that, comprising:
Obtain detected parameters;
Whether match state imposes a condition to judge detected parameters;
If so, then controller judges to be in this state and sends corresponding instruction.
2. the control method of refrigeration system according to claim 1, is characterized in that, comprising:
Obtain compressor current;
Judge whether compressor current is less than compressor first setting value within the t1 time;
If so, then controller judges refrigrant leakage and sends corresponding control instruction;
If not, judge whether compressor current is greater than compressor second setting value within the t2 time;
If so, then controller judges refrigerant circulation loop blocking or/and compressor fault send corresponding control instruction.
3. the control method of refrigeration system according to claim 2, is characterized in that, described acquisition compressor current comprises:
Send and obtain compressor current request,
Receive the compressor current that the request of driven compressor module responds sends;
And/or receive the compressor current of driven compressor module timed sending.
4. the control method of refrigeration system according to claim 1, is characterized in that, comprising:
Obtain the temperature being arranged at temperature sensor on compressor suction duct;
Judge whether temperature is less than temperature first setting value within the t3 time;
If so, then controller judges that refrigerating medium leaks and sends corresponding control instruction;
If not, judge whether temperature is greater than temperature second setting value within the t4 time;
If so, then controller judges that refrigerant temperature is too high sends corresponding control instruction.
5. the control method of refrigeration system according to claim 1, is characterized in that, comprising:
Obtain pump electromechanics stream;
Judge whether pump electromechanics stream is less than pump machine first setting value at setting-up time t5;
If so, then controller judges that refrigerating medium is revealed and sends corresponding control instruction;
If not, judge whether pump electromechanics stream is greater than pump machine second setting value at setting-up time t6;
If so, then controller judges the blocking of refrigerating medium closed circuit or/and pump machine fault send corresponding control instruction.
6. the control method of refrigeration system according to claim 1, is characterized in that, comprising:
Obtain blower fan electric current;
Judge whether blower fan electric current is greater than blower fan setting value in setting-up time t7;
If so, then controller judges fan trouble and sends corresponding control instruction.
7. control method of refrigeration according to claim 1, is characterized in that, comprising:
Obtain supply voltage;
Judge voltage whether within the scope of voltage setting value;
If so, then controller judges that supply voltage is normal and sends corresponding control instruction;
If not, then controller judges power supply overvoltage or under-voltage and send corresponding control instruction.
8. a control device for refrigeration system, is characterized in that, comprising:
Detected parameters acquiring unit, for obtaining detected parameters;
Judging unit, according to detected parameters, whether match state imposes a condition judges whether to be in this duty;
Control unit, sends corresponding instruction according to judging unit result of determination.
9. the control device of refrigeration system according to claim 8, is characterized in that, comprising:
Compressor current acquiring unit, for obtaining compressor current;
Compressor current judging unit, it comprises,
Whether the first compressor current judging unit, be less than compressor first setting value according to compressor current and judge whether cold-producing medium leaks within the t1 time;
Whether the second compressor current judging unit, be greater than compressor second setting value according to compressor current and judge whether refrigerant circulation loop blocking or compressor fault within the t2 time;
And compressor current control unit, send corresponding control instruction according to the judged result of compressor current judging unit.
10. the control device of refrigeration system according to claim 9, is characterized in that, comprising:
Temperature acquiring unit, for obtaining the temperature of the temperature sensor be placed on compressor suction duct;
Temperature judging unit, it comprises,
Whether the first temperature judging unit, be less than temperature first setting value according to temperature and judge whether refrigerating medium leaks within the t3 time;
Whether the second temperature judging unit, be greater than temperature second setting value according to temperature and judge refrigerating medium whether temperature is too high within the t4 time;
Temperature control unit, sends corresponding control instruction according to the result of temperature judging unit.
11. 1 kinds of refrigeration systems, is characterized in that: the control device comprising the refrigeration system described in any one of claim 8-10.
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| CN106545957A (en) * | 2016-10-11 | 2017-03-29 | 广东工业大学 | Variable frequency air conditioner refrigerant leakage detection method based on speed interval parameters |
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