CN205262012U - Refrigerating plant and control system thereof - Google Patents
Refrigerating plant and control system thereof Download PDFInfo
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- CN205262012U CN205262012U CN201521106917.6U CN201521106917U CN205262012U CN 205262012 U CN205262012 U CN 205262012U CN 201521106917 U CN201521106917 U CN 201521106917U CN 205262012 U CN205262012 U CN 205262012U
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Abstract
The utility model provides a refrigerating plant and control system thereof. Refrigerating plant's control system includes: a detecting element is used for detecting the operating load of compressor among the refrigerating plant, the 2nd detecting element for detect the relevant parameter of being correlated with with the compressor -running load among the refrigerating plant, comparing element for the relevant parameter that detects the 2nd detecting element rather than the restriction setting value that corresponds relatively, and the operating load of the compressor that detects a detecting element rather than the regulation setting value that corresponds relatively, and transmit above -mentioned comparative result for execution unit, execution unit when the relevant parameter surpasss its restriction setting value that corresponds, according to the comparative result control compressor increment of load of relevant parameter and its restriction setting value that corresponds or subtract carries, and when the relevant parameter did not surpass its regulation setting value that corresponds, according to the comparative result of operating load rather than the regulation setting value that corresponds, control compressor increment of load or subtract carried or to maintain load unchangeable.
Description
Technical field
The present invention relates to refrigeration technology field, particularly, relate to a kind of refrigerating plant and control system thereof.
Background technology
Refrigerating plant generally comprises compressor, condenser, expansion valve and evaporimeter, and by above-mentioned each unit Series refrigerant circulation stream together; Refrigerant in refrigerant circulation stream is compressed at compressor, enters into condenser condensation, enters into respectively again afterwards expansion valve and evaporimeter, finally becomes low-temp low-pressure gas, again enters into compressor, thereby forms a complete kind of refrigeration cycle process.
In above-mentioned refrigerating plant, the intake air temperature of compressor has determined the cooling load of refrigerating plant to a great extent, therefore needs in practice the intake air temperature of compressor to control, and its specific implementation is to control the operating load of compressor.
In prior art, only according to the operating load state of compressor, its operating load is regulated, exceed on operating load and prescribe a time limit at the operating load state of compressor, control compressor off-load, the operating load of compressor lower than under operating load in limited time, control compressor increment of load. But in the actual moving process of refrigerating plant, also can be subject to the impact of a lot of other factors, be in particular in that disturbance variable is many, non-linear strong, between each loop, there is complicated coupling etc., therefore, only according to the operating load state of compressor, refrigerating plant is controlled and adjusting has great limitation.
Summary of the invention
The present invention is intended at least solve one of technical problem existing in prior art, a kind of refrigerating plant and control system thereof have been proposed, it can avoid occurring in the process of operating load that regulates compressor because relevant parameter exceeds refrigerating plant that its corresponding limit setting value causes or damage or the damage of its intraware, or the cooling load of refrigerating plant is not enough or excessive.
A kind of control system of refrigerating plant is provided for realizing object of the present invention, and it comprises the first detecting unit, the second detecting unit, comparing unit and performance element; Described the first detecting unit is for detection of the operating load of compressor in described refrigerating plant; Described the second detecting unit for detection of in refrigerating plant to the compressor operating relevant relevant parameter of loading; Relevant parameter with it the corresponding limit setting value comparison of described comparing unit for described the second detecting unit is detected, and the adjusting setting value comparison corresponding with it of the operating load of the compressor that described the first detecting unit is detected, and above-mentioned comparative result is transferred to performance element; Described performance element is in the time that described relevant parameter exceeds its corresponding limit setting value, according to compressor increment of load or off-load described in the comparative result control of described relevant parameter and its corresponding limit setting value, in the time that described relevant parameter does not exceed the adjusting setting value of its correspondence, according to the comparative result of the described operating load adjusting setting value corresponding with it, control described compressor increment of load or off-load or maintain load constant.
Wherein, described the first detecting unit comprises energy slider displacement sensor.
Wherein, described relevant parameter comprises at least one for the delivery temperature of the intake air temperature of the temperature of the pressure at expulsion of the admission pressure of the running current of the motor of drive compression machine running, compressor, compressor, refrigerating plant outside, compressor, compressor.
Wherein, described the second detecting unit comprises current sensor, inlet pressure transducer, outlet pressure sensor, external temperature sensor, inlet temperature sensor, outlet temperature sensor; Described current sensor is for detection of the running current of the motor of drive compression machine running; Described inlet pressure transducer is for detection of the admission pressure of described compressor; Described outlet pressure sensor is for detection of the pressure at expulsion of described compressor; Described external temperature sensor is for detection of the temperature of described refrigerating plant outside; Described inlet temperature sensor is for detection of the intake air temperature of described compressor; Described outlet temperature sensor is for detection of the delivery temperature of described compressor.
Wherein, the adjusting setting value that the operating load of described compressor is corresponding comprises the operating load upper limit and operating load lower limit; The operating load of described compressor higher than operating load in limited time, compressor off-load described in described performance element control; The operating load of described compressor lower than under operating load in limited time, compressor increment of load described in described performance element control; The operating load of described compressor at operating load lower limit between the operating load upper limit time, it is constant that described performance element maintains the load of compressor.
Wherein, the limit setting value that described relevant parameter is corresponding comprises restriction initial value and restriction end value; In the time that described relevant parameter exceeds restriction initial value, described performance element is according to compressor increment of load or off-load described in this comparative result control, until described relevant parameter does not exceed restriction end value; Do not exceed restriction when end value at described relevant parameter, described performance element is according to compressor increment of load or off-load described in the comparative result control between the adjusting setting value of the operating load of described compressor and its correspondence or to maintain load constant.
Wherein, described restriction end value does not exceed described restriction initial value.
Wherein, described restriction initial value comprises the restriction initial value upper limit and restriction initial value lower limit, and described restriction end value comprises the restriction end value upper limit and restriction end value lower limit; Be greater than on restriction initial value and prescribe a time limit at described relevant parameter, described performance element is according to compressor increment of load or off-load described in this comparative result control, until described relevant parameter is less than the restriction end value upper limit; Be less than under restriction initial value and prescribe a time limit at described relevant parameter, described performance element is according to compressor increment of load or off-load described in this comparative result control, until described relevant parameter is greater than restriction end value lower limit.
Wherein, described comparing unit also compares locking setting value corresponding with it described relevant parameter, and comparative result is transferred to performance element; Described performance element, in the time that described relevant parameter exceeds the locking setting value of its correspondence, is controlled described refrigerating plant and is shut down.
Wherein, first more described relevant parameter and its corresponding locking setting value before the limit setting value that described comparing unit is corresponding with it at more described relevant parameter.
As another technical scheme, the present invention also provides a kind of refrigerating plant, and it comprises compressor and control system, also comprises the control system of above-mentioned refrigerating plant.
The present invention has following beneficial effect:
The control system of refrigerating plant provided by the invention, it is in the time controlling the operating load of compressor, not only according to the operating load state of the detected compressor of the first detecting unit, the relevant parameter also detecting according to the second detecting unit, thereby can avoid occurring in the process of operating load that regulates compressor exceeds refrigerating plant that its corresponding limit setting value causes or damage or the damage of its intraware because of relevant parameter, or the cooling load of refrigerating plant is not enough or excessive, compared with in prior art, only the operating load state according to compressor regulates, such regulative mode is safer, accurately.
Refrigerating plant provided by the invention, it adopts above-mentioned refrigerating plant provided by the invention, can avoid occurring in the process of operating load that regulates compressor because relevant parameter exceeds refrigerating plant that its corresponding limit setting value causes or damage or the damage of its intraware, or the cooling load of refrigerating plant is not enough or excessive.
Brief description of the drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below. In the accompanying drawings:
Fig. 1 is the schematic diagram of the applied refrigerating plant of control system of refrigerating plant provided by the invention;
The schematic diagram of the control system of the refrigerating plant that Fig. 2 provides for embodiment of the present invention;
The flow chart of the control method of the refrigerating plant that Fig. 3 provides for embodiment of the present invention.
Wherein, Reference numeral:
1: refrigerating plant; 2: compressor; 3: condenser; 4: reservoir; 5: evaporimeter; 6: refrigerant circulation stream; 7: motor; 8: oil pump; 9: oil eliminator;
10: the first detecting units; 11: the second detecting units; 12: comparing unit; 13: performance element;
20: energy slider displacement sensor; 21: current sensor; 22: inlet pressure transducer; 23: outlet pressure sensor; 24: external temperature sensor; 25: inlet temperature sensor; 26: outlet temperature sensor.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated. Should be understood that, detailed description of the invention described herein only, for description and interpretation the present invention, is not limited to the present invention.
The invention provides a kind of embodiment of control system of refrigerating plant. Fig. 1 is the schematic diagram of the applied refrigerating plant of control system of refrigerating plant provided by the invention. As shown in Figure 1, described refrigerating plant 1 comprises compressor 2, condenser 3, reservoir 4, evaporimeter 5, and by above-mentioned each unit Series refrigerant circulation stream 6 together, and the motor 7 turning round for drive compression machine 2. In above-mentioned refrigerating plant 1 actual moving process, refrigerant in refrigerant circulation stream 6 is compressed in compressor 2, enter into condenser 3 condensations, enter into respectively again afterwards reservoir 4 and evaporimeter 5, finally become low-temp low-pressure gas, again enter into compressor 2, thereby form a complete kind of refrigeration cycle process. In addition, described refrigerating plant also comprises lubrication oil circulation stream, and it comprises the oil pump 8 being connected with compressor 2, and is positioned at the oil eliminator 9 on refrigerant circulation stream 6. Particularly, in the time that refrigerant enters into compressor 2, oil pump 8 is to jet lubrication oil in compressor 2; And after refrigerant flows out from compressor 2, refrigerant and lubricating oil enter into oil eliminator 9; In oil eliminator 9, lubricating oil separates with refrigerant, and lubricating oil flows into oil pump 8 again, and refrigerant enters into 6 circulations of refrigerant circulation stream.
The schematic diagram of the control system of the refrigerating plant that Fig. 2 provides for embodiment of the present invention. As shown in Figure 2, the control system of described refrigerating plant comprises the first detecting unit 10, the second detecting unit 11, comparing unit 12 and performance element 13.
Described the first detecting unit 10 is for detection of the operating load of compressor 2 in described refrigerating plant 1; Described the first detecting unit 10 is specifically as follows the energy slider displacement sensor 20 being arranged in described compressor 2; Described energy slider displacement sensor 20 is arranged on compressor 2, can, in the time of compressor 2 compressed action, determine the ratio of effectively doing work in this compression process by the displacement of slide block, thereby determine the operating load of compressor 2.
Described the second detecting unit 11 is for detection of relevant parameter relevant to compressor 2 operating loads in refrigerating plant 1. Described relevant parameter is relevant to the operating load of compressor 2, refer to the impact of the operating load of machine 2 by compression of its numerical value, or, the cooling load of refrigerating plant 1 when its numerical values recited can affect compressor 2 with certain operating load operation, or, its numerical value is excessive or when too small, can refrigerating plant 1 or its internal part be caused damage or be damaged. Described relevant parameter specifically comprises at least one of delivery temperature of intake air temperature, the compressor 2 of temperature, the compressor 2 of pressure at expulsion, refrigerating plant 1 outside of admission pressure, the compressor 2 of running current, the compressor 2 of the motor 7 turning round for drive compression machine 2. Correspondingly, described the second detecting unit 11 comprises current sensor 21, inlet pressure transducer 22, outlet pressure sensor 23, external temperature sensor 24, inlet temperature sensor 25, outlet temperature sensor 26; The running current of the motor 7 that described current sensor 21 turns round for detection of drive compression machine 2; Described inlet pressure transducer 22 is arranged on the inlet end of described compressor 2, and it is for detection of the admission pressure of described compressor 2; Described outlet pressure sensor 23 is arranged on the exhaust end of described compressor 2, and it is for detection of the pressure at expulsion of described compressor 2; Described external temperature sensor 24 is for detection of the temperature of described refrigerating plant 1 outside; Described inlet temperature sensor 25 is arranged on the inlet end of described compressor 2, and it is for detection of the intake air temperature of described compressor 2; Described outlet temperature sensor 26 is arranged on the exhaust end of described compressor 2, and it is for detection of the delivery temperature of described compressor 2.
Relevant parameter with it the corresponding limit setting value comparison of described comparing unit 12 for described the second detecting unit 11 is detected, and the adjusting setting value comparison corresponding with it of the operating load of the compressor 2 that described the first detecting unit 10 is detected, and above-mentioned comparative result is transferred to performance element 13. Maximum and/or the minimum of a value of relevant parameter described in when described limit setting value is refrigerating plant 1 normal operation; Once be greater than maximum or lower than minimum of a value, refrigerating plant 1 can overlond running, causes the damage of refrigerating plant 1 intraware. Described adjusting setting value refers to maximum and/or the minimum of a value of the operating load of described compressor 2; Once the operating load of compressor 2 is greater than maximum, compressor 2 can overlond runnings, and compressor 2 is caused to damage, and if the operating load of compressor 2 is less than minimum of a value, the efficiency of compressor 2 compressed actions can be lower, causes the waste of motor 7 electric energy that consumes.
Described performance element 13 is in the time that described relevant parameter exceeds its corresponding limit setting value, according to compressor 2 increments of load or off-load described in the comparative result control of described relevant parameter and its corresponding limit setting value, in the time that described relevant parameter does not exceed the adjusting setting value of its correspondence, according to the comparative result of the described operating load adjusting setting value corresponding with it, control described compressor 2 increments of load or off-load or maintain load constant. Particularly, it is abnormal that described relevant parameter exceeds described in its corresponding limit setting value representation relevant parameter, now, need to regulate the operating load state of compressor 2, and first to make described relevant parameter return to normal value, this is adjusted to " restriction regulates "; It is normal that described relevant parameter does not exceed described in its corresponding limit setting value representation relevant parameter, now, the adjusting of the operating load to compressor 2 is carried out according to the operating load state of the detected compressor 2 of the first detecting unit 10, this is adjusted to " normal regulating ", and the relative importance value of described " restriction regulates " is higher than " normal regulating ". Particularly, described performance element 13 can comprise increment of load magnetic valve and off-load magnetic valve, in the time need to increasing the operating load of compressor 2, makes the energising of increment of load magnetic valve, and off-load magnetic valve must not be electric; In the time need to reducing the operating load of compressor 2, make the energising of off-load magnetic valve, increment of load magnetic valve must not electricity.
But it should be noted that, described relevant parameter exceeds the implication of " exceeding " in corresponding limit setting value should do following understanding: when the maximum of the relevant parameter in the time that described limit setting value is the normal operation of refrigerating plant 1, described " exceeding " represents that relevant parameter is greater than described maximum; When the minimum of a value of the relevant parameter in the time that described limit setting value is the normal operation of refrigerating plant 1, described " exceeding " represents that relevant parameter is less than described minimum of a value.
Particularly, the adjusting setting value that the operating load of described compressor 2 is corresponding comprises the operating load upper limit and operating load lower limit; The operating load of described compressor 2 higher than operating load in limited time, described performance element 13 is controlled described compressor 2 off-loads; The operating load of described compressor 2 lower than under operating load in limited time, described performance element 13 is controlled described compressor 2 increments of load; The operating load of described compressor 2 at operating load lower limit between the operating load upper limit time, the load that described performance element 13 maintains compressor is constant.
The limit setting value that described relevant parameter is corresponding comprises restriction initial value and restriction end value; In the time that described relevant parameter exceeds restriction initial value, described performance element 13 is according to compressor 2 increments of load or off-load described in this comparative result control, until described relevant parameter does not exceed restriction end value; Do not exceed restriction when end value at described relevant parameter, described performance element 13 is according to compressor 2 increments of load or off-load described in the comparative result control between the adjusting setting value of the operating load of described compressor 2 and its correspondence or to maintain load constant.
Preferably, described restriction end value does not exceed described restriction initial value, described in the time that described limit setting value is the normal operation of refrigerating plant 1 when the maximum of relevant parameter, described restriction end value is less than restriction initial value, described in the time that described limit setting value is the normal operation of refrigerating plant 1, when the minimum of a value of relevant parameter, described restriction end value is greater than restriction initial value. Arrange like this and can make restriction regulate while end, described relevant parameter, within normal range (NR), and reduces its numerical value changing when fluctuation and again exceed the probability of described restriction initial value, that is to say, avoids carrying out continually described restriction adjusting.
Further, described restriction initial value comprises the restriction initial value upper limit and restriction initial value lower limit, and described restriction end value comprises the restriction end value upper limit and restriction end value lower limit; Be greater than on restriction initial value and prescribe a time limit at described relevant parameter, described performance element 13 is according to compressor 2 increments of load or off-load described in this comparative result control, until described relevant parameter is less than the restriction end value upper limit; Be less than under restriction initial value and prescribe a time limit at described relevant parameter, described performance element 13 is according to compressor 2 increments of load or off-load described in this comparative result control, until described relevant parameter is greater than restriction end value lower limit.
The course of work and the principle of the control system below in conjunction with the different situations that may occur in refrigerating plant 1 actual moving process to described refrigerating plant are elaborated.
First, in the time that refrigerating plant 1 moves, the second detecting unit 11 detects the numerical value of described relevant parameter, and comparing unit 12, by limit setting value comparison corresponding with it numerical value of detected relevant parameter, determines whether described relevant parameter exceeds its corresponding limit setting value.
In the time that described relevant parameter exceeds corresponding limit setting value, for example, the numerical value of the running current of the motor 7 that current sensor 21 detects is greater than on the restriction initial value of its correspondence in limited time, the admission pressure that inlet pressure transducer 22 detects is less than under the restriction initial value of its correspondence in limited time, the pressure at expulsion that outlet pressure sensor 23 detects is greater than on the restriction initial value of its correspondence in limited time, the external temperature of the refrigerating plant 1 that external temperature sensor 24 detects is less than under the restriction initial value of its correspondence in limited time at this moment, within described relevant parameter is not in normal range (NR), the cooling load that this means described refrigerating plant 1 can be not enough or excessive, or, described refrigerating plant 1 or its internal part can damage or the consequence such as damage, therefore, in the case, need to limit adjusting, be that performance element 13 is controlled compressor 2 increments of load or off-load, regulate the operating load of described compressor 2, until the numerical value of the relevant parameter that the second detecting unit 11 detects again does not exceed the restriction end value of its correspondence, within returning to normal range (NR), be exactly specifically, the numerical value of the running current of the motor 7 that current sensor 21 detects is less than the restriction end value upper limit of its correspondence, the admission pressure that inlet pressure transducer 22 detects is greater than the restriction end value lower limit of its correspondence, the pressure at expulsion that outlet pressure sensor 23 detects is less than the restriction end value upper limit of its correspondence, the external temperature of the refrigerating plant 1 that external temperature sensor 24 detects is greater than the restriction end value lower limit of its correspondence ...
In the time that described relevant parameter does not exceed corresponding limit setting value, for example, the numerical value of the running current of the motor 7 that current sensor 21 detects is less than on the restriction initial value of its correspondence in limited time, the admission pressure that inlet pressure transducer 22 detects is greater than under the restriction initial value of its correspondence in limited time, the pressure at expulsion that outlet pressure sensor 23 detects is less than on the restriction initial value of its correspondence in limited time, the external temperature of the refrigerating plant 1 that external temperature sensor 24 detects is greater than under the restriction initial value of its correspondence in limited time at this moment, the numerical value of described relevant parameter is all within normal range (NR), in the case, can not consider these factors, the operating load state of the compressor 2 only detecting according to the first detecting unit 10 carries out normal regulating to compressor 2. be exactly specifically, in the time that energy slider displacement sensor 20 detects that the operating load of compressor 2 is excessive, performance element 13 is controlled compressor 2 off-loads, and in the time that energy slider displacement sensor 20 detects that the operating load of compressor 2 is too small, performance element 13 is controlled compressor 2 increments of load.
Preferably, described comparing unit 12 also compares locking setting value corresponding with it described relevant parameter, and comparative result is transferred to performance element 13; Described performance element 13, in the time that described relevant parameter exceeds the locking setting value of its correspondence, is controlled described refrigerating plant 1 and is shut down. Described locking setting value exceeds described limit setting value; in the time that described relevant parameter exceeds described locking setting value; cannot regulate relevant parameter is returned to normal range (NR) by restriction; or need to expend the longer time could return to normal range (NR) by relevant parameter; therefore; in the case, controlling described refrigerating plant 1 shuts down. Further; first more described relevant parameter and its corresponding locking setting value before the described comparing unit 12 limit setting value corresponding with it at more described relevant parameter; then determine it is to shut down according to comparative result, or limit adjusting or normal regulating.
In sum, the control system of the refrigerating plant that embodiment of the present invention provides, it is in the time controlling the operating load of compressor 2, not only according to the operating load state of the detected compressor 2 of the first detecting unit 10, the relevant parameter also detecting according to the second detecting unit 11, thereby can avoid occurring in the process of operating load that regulates compressor 2 exceeds refrigerating plant 1 that its corresponding limit setting value causes or damage or the damage of its intraware because of relevant parameter, or the cooling load of refrigerating plant 1 is not enough or excessive, compared with in prior art, only the operating load state according to compressor regulates, such regulative mode is safer, accurately.
The present invention also provides a kind of embodiment of refrigerating plant. In the present embodiment, described refrigerating plant comprises compressor and control system, and described control system adopts the control system of the refrigerating plant that above-mentioned embodiment provides.
Refrigerating plant provided by the invention, it adopts the control system of the refrigerating plant that above-mentioned embodiment provides, it can avoid occurring in the process of operating load that regulates compressor because relevant parameter exceeds refrigerating plant that its corresponding limit setting value causes or damage or the damage of its intraware, or the cooling load of refrigerating plant is not enough or excessive.
The present invention also provides a kind of embodiment of control method of refrigerating plant. The flow chart of the control method of the refrigerating plant that Fig. 3 provides for embodiment of the present invention. As shown in Figure 3, in the present embodiment, the control method of described refrigerating plant comprises the following steps S1～S4.
S1, detects the operating load of compressor, and detects in refrigerating plant and the compressor operating relevant relevant parameter of loading.
In step S1, can detect the ratio of effectively doing work in the each compressed action process of compressor by energy slider displacement sensor, thereby determine the operating load of compressor.
Described relevant parameter is relevant to the operating load of compressor, refer to the impact of the operating load of machine by compression of its numerical value, or, the cooling load of refrigerating plant when its numerical values recited can affect compressor with certain operating load operation, or, its numerical value is excessive or when too small, can refrigerating plant or its internal part be caused damage or be damaged. Described relevant parameter specifically comprises at least one for the delivery temperature of the intake air temperature of the temperature of the pressure at expulsion of the admission pressure of the running current of the motor of drive compression machine running, compressor, compressor, refrigerating plant outside, compressor, compressor.
S2, the limit setting value that more described relevant parameter is corresponding with it.
Described limit setting value be refrigerating plant while normally moving described in maximum and/or the minimum of a value of relevant parameter; Once be greater than maximum or lower than minimum of a value, refrigerating plant can overlond running, causes the damage of refrigerating plant intraware.
In step S2, every the relevant parameter detecting limit setting value corresponding with this relevant parameter is compared, for example, by the limit setting value comparison of the running current of the motor detecting and motor operating current.
S3, in the time that described relevant parameter exceeds its corresponding limit setting value, according to the comparative result between described relevant parameter and its corresponding limit setting value, controls described compressor increment of load or off-load.
Exceed its corresponding limit setting value at described relevant parameter, it is abnormal that described relevant parameter exceeds described in its corresponding limit setting value representation relevant parameter, now, need to regulate the operating load state of compressor, first to make described relevant parameter return to normal value, avoid damage or the damage of refrigerating plant or its internal part, and avoid the cooling load of refrigerating plant not enough or excessive, this is adjusted to " restriction regulates ".
On described compressor, be provided with increment of load magnetic valve and off-load magnetic valve, in the time that needs are controlled described compressor increment of load, give described increment of load magnetic valve energising, in the time that needs are controlled described compressor off-load, control described off-load magnetic valve energising. Particularly, can, at every turn to increment of load magnetic valve (off-load magnetic valve) energising 2 seconds, then close the mode do action of 28 seconds, the operating load of controlling described compressor progressively increases successively or reduces.
It should be noted that, described relevant parameter exceeds the implication of " exceeding " in corresponding limit setting value should do following understanding: in the time that described limit setting value is the maximum of the relevant parameter of refrigerating plant while normally moving, described " exceeding " represents that relevant parameter is greater than described maximum; In the time that described limit setting value is the minimum of a value of the relevant parameter of refrigerating plant while normally moving, described " exceeding " represents that relevant parameter is less than described minimum of a value.
The limit setting value that described relevant parameter is corresponding comprises restriction initial value and restriction end value; In the time that described relevant parameter exceeds restriction initial value, according to compressor increment of load or off-load described in this comparative result control, until described relevant parameter does not exceed restriction end value; Do not exceed restriction when end value at described relevant parameter, according to compressor increment of load or off-load described in the comparative result control between the adjusting setting value of the operating load of described compressor and its correspondence or to maintain load constant. Preferably, described restriction end value does not exceed described restriction initial value; Described in the time that described limit setting value is the normal operation of refrigerating plant 1 when the maximum of relevant parameter, described restriction end value is less than restriction initial value, described in the time that described limit setting value is the normal operation of refrigerating plant 1, when the minimum of a value of relevant parameter, described restriction end value is greater than restriction initial value. Arrange like this and can make restriction regulate while end, described relevant parameter, within normal range (NR), and reduces its numerical value changing when fluctuation and again exceed the probability of described restriction initial value, that is to say, avoids carrying out continually described restriction adjusting.
Particularly, described restriction initial value comprises the restriction initial value upper limit and restriction initial value lower limit, and described restriction end value comprises the restriction end value upper limit and restriction end value lower limit; Be greater than on restriction initial value and prescribe a time limit at described relevant parameter, according to compressor increment of load or off-load described in this comparative result control, until described relevant parameter is less than the restriction end value upper limit; Be less than under restriction initial value and prescribe a time limit at described relevant parameter, according to compressor increment of load or off-load described in this comparative result control, until described relevant parameter is greater than restriction end value lower limit.
S4, in the time that described relevant parameter does not exceed its corresponding limit setting value, according to the comparative result obtaining after the operating load of the more described compressor adjusting setting value corresponding with it, controls described compressor increment of load or off-load or maintains load constant.
It is normal that described relevant parameter does not exceed described in its corresponding limit setting value representation relevant parameter, now, relevant parameter can not cause damage or the damage of refrigerating plant or its internal part, or cause the cooling load of refrigerating plant not enough or excessive, therefore, the adjusting of the operating load to compressor is carried out according to the operating load state of detected compressor, and this is adjusted to " normal regulating ". The relative importance value of described " restriction regulates " is higher than " normal regulating ".
The adjusting setting value corresponding to operating load of described compressor comprises the operating load upper limit and operating load lower limit; Exceed on operating load and prescribe a time limit at the operating load of described compressor, control described compressor off-load; Be less than under operating load and prescribe a time limit at the operating load of described compressor, control described compressor increment of load; The operating load of described compressor at operating load lower limit between the operating load upper limit time, the load that maintains compressor is constant.
Preferably, when comparing the step of the limit setting value that described relevant parameter is corresponding with it, compare the step of the adjusting setting value that the operating load of described compressor is corresponding with it; In the time that definite relevant parameter does not exceed its corresponding limit setting value, can directly carry out normal regulating according to the comparative result between the operating load of described compressor and its corresponding adjusting setting value like this. And, carry out the comparison of the limit setting value that relevant parameter is corresponding with it, and the operating load of compressor relatively the comparing successively of adjusting setting value corresponding with it carried out the spent time still less simultaneously. Certainly, also can be after the step of the more described relevant parameter limit setting value corresponding with it complete, compare the step of the adjusting setting value that the operating load of described compressor is corresponding with it. In the time that definite described relevant parameter exceeds its corresponding limit setting value, owing to will limiting adjusting, and can not carry out normal regulating like this, therefore, the step just setting value without the operating load that compares the again described compressor adjusting corresponding with it.
As shown in Figure 3, the control method of described refrigerating plant can also comprise:
The step of the locking setting value that more described relevant parameter is corresponding with it; And
In the time that described relevant parameter exceeds the locking setting value of its correspondence, control the step that described refrigerating plant is shut down.
Described locking setting value exceeds described limit setting value; in the time that described relevant parameter exceeds described locking setting value; cannot regulate relevant parameter is returned to normal range (NR) by restriction; or need to expend the longer time could return to normal range (NR) by relevant parameter; therefore; in the case, controlling described refrigerating plant 1 shuts down.
Preferably; the locking setting value that more described relevant parameter is corresponding with it; and in the time that described relevant parameter exceeds the locking setting value of its correspondence; before controlling step that described refrigerating plant the shuts down limit setting value corresponding with it at more described relevant parameter, carry out; shut down to control in time refrigerating plant in the time that described relevant parameter exceeds the locking setting value of its correspondence, avoid damage or the damage of refrigerating plant or its intraware.
The control method of the refrigerating plant that embodiment of the present invention provides, it is in the time controlling the operating load of compressor, not only according to the operating load state of detected compressor, also according to the relevant parameter detecting, thereby can avoid occurring in the process of operating load that regulates compressor exceeds refrigerating plant that its corresponding limit setting value causes or damage or the damage of its intraware because of relevant parameter, or the cooling load of refrigerating plant is not enough or excessive, compared with in prior art, only the operating load state according to compressor regulates, such regulative mode is safer, accurately.
Be understandable that, above embodiment is only used to principle of the present invention is described and the illustrative embodiments that adopts, but the present invention is not limited thereto. For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (11)
1. a control system for refrigerating plant, is characterized in that, comprise the first detecting unit,The second detecting unit, comparing unit and performance element;
Described the first detecting unit is negative for detection of the operation of compressor in described refrigerating plantLotus;
Described the second detecting unit is for detection of relevant to compressor operating load in refrigerating plantRelevant parameter;
Described comparing unit is for relevant parameter that described the second detecting unit is detected and itsCorresponding limit setting value comparison, and the compressor that described the first detecting unit is detectedThe adjusting setting value that operating load is corresponding with it compares, and above-mentioned comparative result is transferred to executionUnit;
Described performance element in the time that described relevant parameter exceeds its corresponding limit setting value, rootAccording to compressor described in the comparative result control of described relevant parameter and its corresponding limit setting valueIncrement of load or off-load, in the time that described relevant parameter does not exceed the adjusting setting value of its correspondence, according to instituteState the comparative result of the adjusting setting value that operating load is corresponding with it, control described compressor increment of loadOr off-load or to maintain load constant.
2. the control system of refrigerating plant according to claim 1, is characterized in that,Described the first detecting unit comprises energy slider displacement sensor.
3. the control system of refrigerating plant according to claim 1, is characterized in that,Described relevant parameter comprises for the running current of the motor of drive compression machine running, compressorThe pressure at expulsion of admission pressure, compressor, the temperature of refrigerating plant outside, the air inlet of compressorAt least one in the delivery temperature of temperature, compressor.
4. according to the control system of the refrigerating plant described in claim 1 or 3, its feature existsIn, described the second detecting unit comprises current sensor, inlet pressure transducer, outlet pressureSensor, external temperature sensor, inlet temperature sensor, outlet temperature sensor;
Described current sensor is for detection of the running current of the motor of drive compression machine running;
Described inlet pressure transducer is for detection of the admission pressure of described compressor;
Described outlet pressure sensor is for detection of the pressure at expulsion of described compressor;
Described external temperature sensor is for detection of the temperature of described refrigerating plant outside;
Described inlet temperature sensor is for detection of the intake air temperature of described compressor;
Described outlet temperature sensor is for detection of the delivery temperature of described compressor.
5. the control system of refrigerating plant according to claim 1, is characterized in that,The adjusting setting value corresponding to operating load of described compressor comprises the operating load upper limit and operationLoad lower limit;
The operating load of described compressor higher than operating load in limited time, described performance elementControl described compressor off-load; At the operating load of described compressor lower than operating load lower limitTime, compressor increment of load described in described performance element control; Operating load at described compressor existsOperating load lower limit is between the operating load upper limit time, and described performance element maintains carrying of compressorLotus is constant.
6. the control system of refrigerating plant according to claim 1, is characterized in that,The limit setting value that described relevant parameter is corresponding comprises restriction initial value and restriction end value;
In the time that described relevant parameter exceeds restriction initial value, described performance element according to this relativelyCompressor increment of load or off-load described in output control, finish until described relevant parameter does not exceed restrictionValue; In the time that described relevant parameter does not exceed restriction end value, described performance element is according to described pressureDescribed in comparative result control between the operating load of contracting machine and the adjusting of its correspondence setting value, pressContracting machine increment of load or off-load or to maintain load constant.
7. the control system of refrigerating plant according to claim 6, is characterized in that,Described restriction end value does not exceed described restriction initial value.
8. according to the control system of the refrigerating plant described in claim 6 or 7, its feature existsIn, described restriction initial value comprises the restriction initial value upper limit and restriction initial value lower limit, described limitEnd value processed comprises the restriction end value upper limit and restriction end value lower limit;
Be greater than on restriction initial value and prescribe a time limit at described relevant parameter, described performance element is according to being somebody's turn to doCompressor increment of load or off-load described in comparative result control, until described relevant parameter is less than restriction knotThe bundle value upper limit;
Be less than under restriction initial value and prescribe a time limit at described relevant parameter, described performance element is according to being somebody's turn to doCompressor increment of load or off-load described in comparative result control, until described relevant parameter is greater than restriction knotBundle value lower limit.
9. according to the control system of the refrigerating plant described in claim 1 or 3, its feature existsIn, described comparing unit also compares locking setting value corresponding with it described relevant parameter, andComparative result is transferred to performance element;
Described performance element, in the time that described relevant parameter exceeds the locking setting value of its correspondence, is controlledMaking described refrigerating plant shuts down.
10. the control system of refrigerating plant according to claim 9, is characterized in that,Before the described comparing unit limit setting value corresponding with it at more described relevant parameter first thanThe locking setting value that more described relevant parameter is corresponding with it.
11. 1 kinds of refrigerating plants, comprise compressor and control system, it is characterized in that, described inControl system adopts the control system of the refrigerating plant described in claim 1～10 any one.
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| CN201521106917.6U CN205262012U (en) | 2015-12-28 | 2015-12-28 | Refrigerating plant and control system thereof |
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| CN201521106917.6U CN205262012U (en) | 2015-12-28 | 2015-12-28 | Refrigerating plant and control system thereof |
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| CN205262012U true CN205262012U (en) | 2016-05-25 |
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