CN112665248B - Multi-chamber flow control method and device of refrigeration system and refrigeration system - Google Patents
Multi-chamber flow control method and device of refrigeration system and refrigeration system Download PDFInfo
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- CN112665248B CN112665248B CN202011583625.7A CN202011583625A CN112665248B CN 112665248 B CN112665248 B CN 112665248B CN 202011583625 A CN202011583625 A CN 202011583625A CN 112665248 B CN112665248 B CN 112665248B
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Abstract
The embodiment of the invention discloses a multi-chamber flow control method and device of a refrigerating system and the refrigerating system, wherein the method comprises the following steps: acquiring the on-off state of each electromagnetic valve in the refrigeration system, the actual temperature of each chamber and the heating output quantity of a heater of each chamber; determining the temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber; when the electromagnetic valves corresponding to the chambers are in a conducting state, the temperature difference is within the preset temperature difference range, and the absolute value of the difference value of the heating output quantity between the chambers is larger than the preset threshold value, the opening value of the electromagnetic valve corresponding to each chamber is controlled to increase the preset opening quantity or decrease the preset opening quantity according to the magnitude relation and the difference value of the heating output quantity of each chamber and the current opening value of the electromagnetic valve corresponding to each chamber, so that the flow of the chambers is controlled. The technical scheme provided by the embodiment of the invention can realize multi-chamber flow control, simultaneously realize energy conservation and solve the problem of uneven multi-chamber flow distribution.
Description
Technical Field
The embodiment of the invention relates to a refrigeration technology, in particular to a multi-chamber flow control method and device of a refrigeration system and the refrigeration system.
Background
In production life, refrigeration systems are widely used, for example, for goods, equipment and spaces with specific requirements on temperature. For a multi-chamber refrigerating system, if the refrigerant flow distribution among the chambers is seriously uneven, the heating output of different chambers is uneven, the heating output of a chamber with small flow demand is large, and the heating output of a chamber with large flow demand is small, so that energy waste is caused, and the temperature fluctuation of the intermediate chamber of the refrigerating system is also caused. Accordingly, there is a need for more reliable control of the flow rate of each compartment in a refrigeration system.
At present, in a conventional multi-chamber flow control method of a refrigeration system, a chamber flow is generally controlled by adjusting a pressure change of a refrigerant cycle, and a variable quantity of the control flow is fixed, and a chamber flow is controlled by adjusting an opening degree of a solenoid valve corresponding to a chamber only according to a pipeline pressure control factor, wherein the chamber flow is only related to a pipeline pressure, so that reliability of the flow control is affected, and flow distribution among intermediate chambers of the refrigeration system is not uniform, so that normal operation of the intermediate chambers of the refrigeration system is affected.
Disclosure of Invention
The embodiment of the invention provides a multi-chamber flow control method and device of a refrigerating system and the refrigerating system, which are used for realizing multi-chamber flow control, realizing energy conservation and solving the problem of uneven multi-chamber flow distribution.
In a first aspect, an embodiment of the present invention provides a method for controlling a flow rate of multiple chambers of a refrigeration system, including:
acquiring the on-off state of each electromagnetic valve in the refrigeration system, the actual temperature of each chamber and the heating output quantity of a heater of each chamber; each chamber is provided with a corresponding preset target temperature, and the chambers correspond to the electromagnetic valves one by one;
determining the temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber;
when the electromagnetic valves corresponding to the chambers are in a conducting state, the temperature difference is within the preset temperature difference range, and the absolute value of the difference value of the heating output quantity between the chambers is larger than the preset threshold value, the opening value of the electromagnetic valve corresponding to each chamber is controlled to increase the preset opening quantity or decrease the preset opening quantity according to the magnitude relation and the difference value of the heating output quantity of each chamber and the current opening value of the electromagnetic valve corresponding to each chamber, so that the flow of the chambers is controlled.
Optionally, the solenoid valve includes a first solenoid valve and a second solenoid valve, and the chamber includes a first chamber corresponding to the first solenoid valve and a second chamber corresponding to the second solenoid valve;
controlling the opening value of the electromagnetic valve corresponding to each chamber to increase or decrease a preset opening value according to the magnitude relation and the difference of the heating output quantity of each chamber and the current opening value of the electromagnetic valve corresponding to each chamber, and the method comprises the following steps:
determining the size relationship of T1HMV and T2HMV when r1 is 1 and r2 is 1, Δ T11 is ≦ Δ T1 ≦ Δ T12 and Δ T21 is ≦ Δ T2 ≦ Δ T22, | T1HMV-T2HMV | > THMV; wherein r1 ═ 1 denotes that the first solenoid valve is in an on state, r2 ═ 1 denotes that the second solenoid valve is in an on state, Δ T1 denotes a temperature difference between an actual temperature of the first compartment and a preset target temperature of the first compartment, Δ T2 denotes a temperature difference between an actual temperature of the second compartment and a preset target temperature of the second compartment, Δ T11 and Δ T12 denote a minimum value and a maximum value, respectively, of a preset temperature difference range of Δ T1, Δ T21 and Δ T22 denote a minimum value and a maximum value, respectively, of a preset temperature difference range of Δ T2, T1HMV denotes a heating output of the first compartment, T2HMV denotes a heating output of the second compartment, and THMV denotes a preset heating output threshold of | T1HMV — T2HMV |;
when T1HMV is larger than T2HMV, if T1HMV > delta T1HMV and the opening degree of the second electromagnetic valve is smaller than a preset maximum opening degree value, controlling the opening degree value of the second electromagnetic valve to increase a preset opening degree; wherein Δ T1HMV is a target reference value for the heating output of the first compartment;
when the T1HMV is less than or equal to the T2HMV, if the T2HMV > delta T2HMV and the opening degree of the first electromagnetic valve is smaller than a preset maximum opening degree value, controlling the opening degree value of the first electromagnetic valve to increase a preset opening degree; wherein Δ T2HMV is a target reference value for the heating output of the second compartment.
Optionally, after controlling the opening value of the second electromagnetic valve to increase by the preset opening amount, the method includes:
controlling a second electromagnetic valve to maintain the preset time of the current opening;
and when the T2HMV-T1HMV is greater than the THMV, if the T2HMV > delta T2HMV and the opening degree of the second electromagnetic valve is greater than the preset minimum opening degree value, controlling the opening degree value of the second electromagnetic valve to reduce the preset opening degree value.
Optionally, after controlling the opening value of the first electromagnetic valve to increase by the preset opening amount, the method includes:
controlling a first electromagnetic valve to maintain the preset time of the current opening degree;
and when the T1HMV-T2HMV > THMV, if the T1HMV >. DELTA.T 1HMV and the opening degree of the first electromagnetic valve is greater than the preset minimum opening degree value, controlling the opening degree value of the first electromagnetic valve to reduce the preset opening degree value.
Optionally, after determining the size relationship between the T1HMV and the T2HMV, the method includes:
when T1HMV is larger than T2HMV, if T1HMV > delta T1HMV and the opening degree of the second electromagnetic valve is larger than or equal to the preset maximum opening degree value, whether T1HMV-T2HMV is larger than THMV is judged;
if the T1HMV-T2HMV is greater than the THMV, when the T1HMV > delta T1HMV and the opening degree of the first electromagnetic valve is greater than a preset minimum opening degree value, controlling the opening degree value of the first electromagnetic valve to reduce the preset opening degree value;
when T1HMV is less than or equal to Delta T1HMV, the opening degree of the second electromagnetic valve is controlled to be increased by a preset opening degree value when the opening degree of the second electromagnetic valve is smaller than a preset maximum opening degree value.
Optionally, after determining the size relationship between the T1HMV and the T2HMV, the method includes:
when T1HMV is larger than T2HMV, if T2HMV > delta T2HMV and the opening degree of the first electromagnetic valve is larger than or equal to a preset maximum opening degree value, whether T2HMV-T1HMV is larger than THMV is judged;
if the T2HMV-T1HMV is greater than the THMV, when the T2HMV > delta T2HMV and the opening degree of the second electromagnetic valve is greater than the preset minimum opening degree value, controlling the opening degree value of the second electromagnetic valve to reduce the preset opening degree value;
when T2HMV is less than or equal to DeltaT 2HMV, the opening degree of the first electromagnetic valve is controlled to be increased by a preset opening degree amount when the opening degree of the first electromagnetic valve is smaller than a preset maximum opening degree value.
Optionally, after determining the size relationship between the T1HMV and the T2HMV, the method includes:
when T1HMV is larger than T2HMV, if T1HMV is smaller than or equal to Delta T1HMV, judging whether the opening degree of the first electromagnetic valve is larger than a preset minimum opening degree value;
and when the opening degree of the first electromagnetic valve is greater than the preset minimum opening degree value, controlling the opening degree value of the first electromagnetic valve to increase the preset opening degree value.
In a second aspect, an embodiment of the present invention further provides a multi-chamber flow control device for a refrigeration system, including:
the data state acquisition module is used for acquiring the switching state of each electromagnetic valve in the refrigeration system, the actual temperature of each chamber and the heating output quantity of the heater of each chamber; each chamber is provided with a corresponding preset target temperature, and the chambers correspond to the electromagnetic valves one by one;
the temperature difference determining module is used for determining the temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber;
and the flow control module is used for controlling the opening value of the electromagnetic valve corresponding to each chamber to increase or decrease the preset opening amount according to the magnitude relation and the difference of the heating output amount of each chamber and the current opening value of the electromagnetic valve corresponding to each chamber so as to control the flow of the chambers when the electromagnetic valves corresponding to each chamber are in a conducting state, the temperature difference is within the preset temperature difference range and the absolute value of the difference of the heating output amounts of the chambers is greater than the preset threshold value.
In a third aspect, an embodiment of the present invention further provides a refrigeration system, including: the variable frequency compressor, the controller, at least two chambers and at least two electromagnetic valves which are in one-to-one correspondence with the at least two chambers, wherein the multi-chamber flow control device of the refrigeration system is integrated in the controller; the electromagnetic valve is electrically connected with the controller, and the variable frequency compressor is connected with the evaporator of the corresponding compartment through a passage where the electromagnetic valve is located.
Optionally, the compartment includes a temperature sensor, an evaporator and a heater, and the temperature sensor, the evaporator and the heater are all electrically connected to the controller.
According to the multi-chamber flow control method and device for the refrigeration system and the refrigeration system, the temperature difference between the actual temperature of each chamber and the corresponding preset target temperature is determined according to the acquired actual temperature of each chamber; when the electromagnetic valves corresponding to the chambers are in a conducting state, the temperature difference is within the preset temperature difference range, and the absolute value of the difference value of the heating output quantity between the chambers is larger than the preset threshold value, the opening value of the electromagnetic valve corresponding to each chamber is controlled to increase the preset opening quantity or decrease the preset opening quantity according to the magnitude relation and the difference value of the heating output quantity of each chamber and the current opening value of the electromagnetic valve corresponding to each chamber, so that the flow of the chambers is controlled. According to the multi-chamber flow control method and device for the refrigeration system and the refrigeration system, the opening degree value of the electromagnetic valve corresponding to each chamber is controlled to increase the preset opening degree value or decrease the preset opening degree value according to the magnitude relation and the difference value of the heating output quantity of each chamber and the current opening degree value of the electromagnetic valve corresponding to each chamber, so that the flow of the corresponding chamber is controlled, energy is saved, and the problem of uneven flow distribution of the multi-chamber is solved.
Drawings
Fig. 1 is a flowchart of a multi-chamber flow control method of a refrigeration system according to an embodiment of the present invention;
fig. 2 is a flowchart of a multi-chamber flow control method of a refrigeration system according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a refrigeration system according to a second embodiment of the present invention;
fig. 4 is a block diagram of a multi-chamber flow control device of a refrigeration system according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a multi-chamber flow control method for a refrigeration system according to an embodiment of the present invention, where this embodiment is applicable to aspects such as controlling a flow of a chamber of a refrigeration system, and the method may be implemented by a multi-chamber flow control apparatus of a refrigeration system, where the apparatus may be implemented by software and/or hardware, and the apparatus may be integrated in an electronic device such as a computer having a multi-chamber flow control function of a refrigeration system, and the method specifically includes the following steps:
and step 110, acquiring the on-off state of each electromagnetic valve in the refrigeration system, the actual temperature of each chamber and the heating output quantity of the heater of each chamber.
The chambers are provided with corresponding preset target temperatures, the preset target temperatures arranged in the chambers can be the same or different, and the chambers correspond to the electromagnetic valves one to one. Each compartment is provided with a temperature sensor, and the multi-compartment flow control device of the refrigeration system can acquire the actual temperature of each compartment through a port which is arranged on the multi-compartment flow control device and electrically connected with the temperature sensor of each compartment, and can acquire the heating output quantity of the heater of each compartment through a port which is arranged on the multi-compartment flow control device and electrically connected with the heater of each compartment so as to control the flow of each compartment.
And step 120, determining the temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber.
Wherein, the temperature unit can be centigrade, and the difference between the actual temperature of the chamber and the corresponding preset target temperature, such as-20 ℃, is used as the temperature difference of the chamber. The preset target temperatures of the chambers may be the same or different, and specific values of the preset target temperatures may be set according to actual conditions, which are not limited herein.
And step 130, when the electromagnetic valves corresponding to the chambers are in a conducting state, the temperature difference is within the preset temperature difference range, and the absolute value of the difference value of the heating output quantity between the chambers is larger than a preset threshold value, controlling the opening value of the electromagnetic valve corresponding to each chamber to increase or decrease the preset opening quantity according to the magnitude relation and the difference value of the heating output quantity of each chamber and the current opening value of the electromagnetic valve corresponding to each chamber so as to control the flow of the chambers.
Specifically, taking the case where the refrigeration system includes two chambers, i.e., a first chamber and a second chamber, the first chamber and the second chamber respectively correspond to a first solenoid valve and a second solenoid valve. For example, when r1 is 1 and r2 is 1, -1 ≦ Δ T1 ≦ 0.1 and-1 ≦ Δ T2 ≦ +0.1, | T1HMV-T2HMV | > 5.0%, the magnitude relationship between T1HMV (heating output of the first compartment) and T2HMV (heating output of the second compartment) is determined, r1 ≦ 1 indicates that the first solenoid valve is in the on state, r2 ≦ 1 indicates that the second solenoid valve is in the on state, Δ T1 (deg.c) is the temperature difference between the actual temperature of the first compartment and the preset target temperature of the first compartment, Δ T2 (deg.c) is the temperature difference between the actual temperature of the second compartment and the preset target temperature of the second compartment; when T1HMV > T2HMV, if T1HMV >. DELTA.T 1HMV (a target reference value of the heating output of the first compartment) and the opening degree of the second electromagnetic valve is smaller than a preset maximum opening degree value, controlling the opening degree value of the second electromagnetic valve to increase the preset opening degree value; continuously controlling the second electromagnetic valve to maintain the preset time of the current opening; and when the T2HMV-T1HMV is greater than 5.0%, if the T2HMV > delta T2HMV (the target reference value of the heating output quantity of the second chamber) and the opening degree of the second electromagnetic valve is greater than a preset minimum opening degree value, controlling the opening degree value of the second electromagnetic valve to be reduced by a preset opening degree. When the T1HMV is less than or equal to the T2HMV, if the T2HMV > delta T2HMV and the opening degree of the first electromagnetic valve is smaller than a preset maximum opening degree value, controlling the opening degree value of the first electromagnetic valve to increase a preset opening degree; continuously controlling the first electromagnetic valve to maintain the preset time of the current opening; and when the T1HMV-T2HMV is greater than 5.0%, if the T1HMV > delta T1HMV and the opening degree of the first electromagnetic valve is greater than a preset minimum opening degree value, controlling the opening degree value of the first electromagnetic valve to reduce the preset opening degree value. The opening value of the first electromagnetic valve is controlled to increase the preset opening amount or reduce the preset opening amount, and the opening value of the second electromagnetic valve is controlled to increase the preset opening amount or reduce the preset opening amount, so that the flow of the corresponding chambers is controlled, the flow of the first chamber and the flow of the second chamber are correspondingly increased or reduced, and the problem of uneven flow distribution of multiple chambers is solved.
According to the multi-chamber flow control method of the refrigeration system provided by the embodiment, the opening value of the electromagnetic valve corresponding to each chamber is controlled to increase or decrease the preset opening value according to the magnitude relation and the difference of the heating output quantity of each chamber and the current opening value of the electromagnetic valve corresponding to each chamber, so that the flow of the corresponding chamber is controlled, energy is saved, and the problem of uneven flow distribution of the multi-chamber is solved.
Example two
Fig. 2 is a flowchart of a multi-chamber flow control method of a refrigeration system according to a second embodiment of the present invention, and fig. 3 is a schematic structural diagram of a refrigeration system according to a second embodiment of the present invention, where this embodiment is applicable to control of chamber flow of a refrigeration system, and the method may be implemented by a multi-chamber flow control device of a refrigeration system, where this device may be implemented by software and/or hardware, and this device may be integrated in an electronic device, such as a computer, having a multi-chamber flow control function of a refrigeration system, and this method specifically includes the following steps:
and step 210, acquiring the on-off state of each electromagnetic valve in the refrigeration system, the actual temperature of each compartment and the heating output quantity of the heater of each compartment.
The chambers are provided with corresponding preset target temperatures, the preset target temperatures arranged in the chambers can be the same or different, and the chambers correspond to the electromagnetic valves one to one. Referring to fig. 3, the refrigeration system includes an inverter compressor 10, a controller 20, at least two chambers 30, and at least two solenoid valves 40 corresponding to the at least two chambers 30 one by one, and a multi-chamber flow control device of the refrigeration system is integrated in the controller 20; the electromagnetic valve 40 is electrically connected to the controller 20, and the inverter compressor 10 is connected to the evaporator 50 of the corresponding compartment 30 through a passage in which the electromagnetic valve 40 is located. The controller 20 is also electrically connected to the inverter compressor 10 and can control the rotation speed of the inverter compressor 10. Fig. 3 exemplifies that the refrigeration system includes two compartments 30, and the inverter compressor 10 in the refrigeration system works for the two compartments 30 to realize parallel cycle refrigeration, i.e., the parallel cycle refrigeration system. The compartment 30 comprises a temperature sensor 70, an evaporator 50 and a heater 80, and the temperature sensor 70, the evaporator 50 and the heater 80 are all electrically connected with the controller 20; the heater 81 of the first compartment 31 and the heater 82 of the second compartment 32 output heat to the first compartment 31 and the second compartment 32, respectively, to meet the compartment requirements. The inverter compressor 10 is connected with the evaporator 51 of the first compartment 31 through the passage of the first electromagnetic valve 41 and is connected with the evaporator 52 of the second compartment 32 through the passage of the second electromagnetic valve 42, the inverter compressor 10 compresses sucked gas and transmits the compressed gas to the condenser 60 through a gas pipeline for condensation, so that the condensed refrigerant is transmitted to the first compartment 31 through the passage of the first electromagnetic valve 41 and is transmitted to the second compartment 32 through the passage of the second electromagnetic valve 42. The multi-compartment flow rate control device integrated in the controller 20 may acquire the temperature of the first compartment 31 and the temperature of the second compartment 32 through the temperature sensor 71 of the first compartment 31 and the temperature sensor 72 of the second compartment 32, respectively, to control the flow rate of each compartment 30.
And step 220, determining the temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber.
The temperature unit may be celsius degrees, and the difference between the actual temperature of the compartment 30 and the corresponding preset target temperature, such as-20 ℃, is used as the temperature difference of the compartment. The preset target temperatures of the compartments 30 may be the same or different, and specific values of the preset target temperatures may be set according to actual conditions, which is not limited herein.
Specifically, r1 ═ 1 indicates that the first solenoid valve 41 is in an on state, r2 ═ 1 indicates that the second solenoid valve 41 is in an on state, Δ T1(° c) indicates a temperature difference between an actual temperature of the first chamber 31 and a preset target temperature of the first chamber 32, Δ T2(° c) indicates a temperature difference between an actual temperature of the second chamber 32 and a preset target temperature of the second chamber 32, Δ T11 and Δ T12 indicate a minimum value and a maximum value of a preset temperature difference range of Δ T1, Δ T21 and Δ T22 indicate a minimum value and a maximum value of a preset temperature difference range of Δ T2, T1HMV is a heating output of the first chamber 31, T2HMV is a heating output of the second chamber 32, and THMV is a preset heating output threshold of | T1HMV — T2HMV |. And determining the sizes of the T1HMV and the T2HMV to enter a flow distribution and energy saving mode, and controlling the opening degree of the first electromagnetic valve 41 and the opening degree of the second electromagnetic valve 42 to control the flow of the corresponding chambers.
Where Δ T1HMV is a target reference value of the heating output of the first compartment 31, and the specific value may be set according to actual conditions, which is not limited herein.
Where EV2 represents the second solenoid valve 42, the specific value of the preset maximum opening value may be set according to actual conditions, and is not limited herein.
And step 270, controlling e2+ 1.
Wherein e2 represents the opening degree of the second solenoid valve 42, and if the opening degree of the EV2 is smaller than the preset maximum opening degree value, e2+1 is controlled, that is, the opening degree of the second solenoid valve 42 is controlled to be increased by 1 magnitude, and the 1 magnitude of the opening degree of the solenoid valve may be a value corresponding to a certain angle, and may be specifically set according to the actual situation, which is not limited herein.
The preset time period may be 30s, and may be specifically set according to an actual situation, which is not limited herein.
Specifically, the percentage corresponding to Δ THMV, for example, 1.0%, may be a percentage of a certain heating amount value, and the heating amount value may be set according to an actual situation, which is not limited herein.
282, judging whether the T2HMV-T1HMV is more than or equal to THMV; if yes, go to step 283; if not, the process is ended.
Specifically, THMV may be greater than Δ THMV, and the percentage of THMV, e.g., 5.0%, may be a percentage of a heating value, which may be set according to actual conditions, and is not limited herein.
283, judging whether the T2HMV is larger than the Delta T2 HMV; if so, go to step 284; if not, step 289 is performed.
Where Δ T2HMV is a target reference value of the heating output of the second chamber 32, and a specific value of Δ T2HMV may be set according to actual conditions, which is not limited herein.
Where EV2 represents the second solenoid valve 42, the specific value of the preset minimum opening value may be set according to actual conditions, and is not limited herein.
And step 285, controlling e 2-1.
Specifically, if the opening degree of the EV2 is greater than the preset minimum opening degree value, e2-1 is controlled, that is, the corresponding second chamber is controlled to reduce the corresponding flow rate.
And step 286, controlling the EV2 to maintain the current opening for a preset time.
288, judging whether the T2HMV is larger than the Delta T2 HMV; if so, go to step 289; if not, return to step 284.
EV1 denotes a first solenoid valve.
And step 290, controlling e1+ 1.
Where e1 represents the opening degree of the first solenoid valve 41, and if the opening degree of the EV1 is smaller than the preset maximum opening degree value, e1+1 is controlled, that is, the flow rate of the corresponding first compartment 31 is controlled to increase.
And step 291, controlling the EV1 to maintain the current opening for a preset time.
292, judging whether the T1HMV-T2HMV is more than or equal to the delta THMV; if so, go to step 293; if not, return to step 289.
294, judging whether T1HMV is larger than delta T1 HMV; if so, go to step 295; if not, return to step 260.
Specifically, the multi-chamber flow rate control apparatus integrated in the controller 20 controls the opening degree of the first solenoid valve 41 to increase or decrease and the opening degree of the second solenoid valve 42 to increase or decrease by performing the above steps, thereby controlling the flow rates of the respective chambers, so that the flow rate of the first chamber 31 and the flow rate of the second chamber 32 are correspondingly increased or decreased, and solving the problems of uneven multi-chamber flow rate distribution, high energy consumption, temperature fluctuation and the like.
According to the multi-chamber flow control method of the refrigeration system provided by the embodiment, the opening value of the electromagnetic valve corresponding to each chamber is controlled to increase or decrease the preset opening value according to the magnitude relation and the difference of the heating output quantity of each chamber and the current opening value of the electromagnetic valve corresponding to each chamber, so that the flow of the corresponding chamber is controlled, energy is saved, and the problems of uneven flow distribution, high energy consumption, temperature fluctuation and the like of the multi-chamber are solved.
EXAMPLE III
Fig. 4 is a block diagram of a multi-chamber flow control apparatus of a refrigeration system according to a third embodiment of the present invention, which includes a data state obtaining module 310, a temperature difference determining module 320, and a flow control module 330; the data state obtaining module 310 is configured to obtain a switching state of each electromagnetic valve in the refrigeration system, an actual temperature of each compartment, and a heating output of a heater of each compartment; each chamber is provided with a corresponding preset target temperature, and the chambers correspond to the electromagnetic valves one by one; the temperature difference determining module 320 is configured to determine a temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber; the flow control module 330 is configured to, when the electromagnetic valves corresponding to the chambers are all in a conducting state, the temperature difference is within the preset temperature difference range, and the absolute value of the difference between the heating output amounts of the chambers is greater than the preset threshold, control the opening value of the electromagnetic valve corresponding to each chamber to increase the preset opening amount or decrease the preset opening amount according to the magnitude relationship and the difference between the heating output amounts of the chambers and the current opening value of the electromagnetic valve corresponding to each chamber, so as to control the flow rate of the chambers.
In addition to the above embodiment, the solenoid valves include a first solenoid valve and a second solenoid valve, and the compartments include a first compartment corresponding to the first solenoid valve and a second compartment corresponding to the second solenoid valve; the flow control module 330 includes a magnitude relation determining unit, a first opening degree control unit, and a second opening degree control unit; wherein the size relationship determination unit is configured to determine the size relationship of T1HMV and T2HMV when r1 is 1 and r2 is 1, Δ T11 ≦ Δ T1 ≦ Δ T12 and Δ T21 ≦ Δ T2 ≦ Δ T22, | T1HMV-T2HMV | > THMV; wherein r1 ═ 1 denotes that the first solenoid valve is in an on state, r2 ═ 1 denotes that the second solenoid valve is in an on state, Δ T1 denotes a temperature difference between an actual temperature of the first compartment and a preset target temperature of the first compartment, Δ T2 denotes a temperature difference between an actual temperature of the second compartment and a preset target temperature of the second compartment, Δ T11 and Δ T12 denote a minimum value and a maximum value, respectively, of a preset temperature difference range of Δ T1, Δ T21 and Δ T22 denote a minimum value and a maximum value, respectively, of a preset temperature difference range of Δ T2, T1HMV denotes a heating output of the first compartment, T2HMV denotes a heating output of the second compartment, and THMV denotes a preset heating output threshold of | T1HMV — T2HMV |; the first opening control unit is used for controlling the opening value of the second electromagnetic valve to increase a preset opening amount if T1HMV > T2HMV and the opening of the second electromagnetic valve is smaller than a preset maximum opening value when T1HMV > Delta T1 HMV; wherein Δ T1HMV is a target reference value for the heating output of the first compartment; the second opening control unit is used for controlling the opening value of the first electromagnetic valve to increase the preset opening amount if T2HMV > delta T2HMV and the opening of the first electromagnetic valve is smaller than the preset maximum opening value when T1HMV is smaller than or equal to T2 HMV; wherein Δ T2HMV is a target reference value for the heating output of the second compartment.
Preferably, the flow control module 330 further includes a first duration control unit and a third opening degree control unit; the first time length control unit is used for controlling the second electromagnetic valve to maintain the preset time length of the current opening degree; the third opening degree control unit is used for controlling the opening degree value of the second electromagnetic valve to reduce the preset opening degree value if the opening degree of the second electromagnetic valve is larger than the preset minimum opening degree value and T2HMV > delta T2HMV when T2HMV-T1HMV > THMV.
Preferably, the flow control module 330 further includes a second duration control unit and a third duration control unit; the second time length control unit is used for controlling the first electromagnetic valve to maintain the preset time length of the current opening degree; the third opening degree control unit is used for controlling the opening degree value of the first electromagnetic valve to reduce the preset opening degree value if the T1HMV-T2HMV is larger than the preset minimum opening degree value and the opening degree of the first electromagnetic valve is larger than the preset minimum opening degree value when the T1HMV-T2HMV is larger than the THMV.
Preferably, the flow control module 330 further includes a first difference determining unit, a fourth opening control unit, and a fifth opening control unit; the first difference value judging unit is used for judging whether the T1HMV-T2HMV is larger than the THMV or not if the T1HMV > delta T1HMV and the opening degree of the second electromagnetic valve is larger than or equal to a preset maximum opening value when the T1HMV > T2 HMV; the fourth opening control unit is used for controlling the opening value of the first electromagnetic valve to reduce the preset opening amount when the T1HMV-T2HMV is greater than the THMV and the opening of the first electromagnetic valve is greater than the preset minimum opening value if the T1HMV is greater than the THMV; and the fifth opening control unit is used for controlling the opening value of the second electromagnetic valve to increase the preset opening amount when the opening of the second electromagnetic valve is smaller than the preset maximum opening value continuously when the T1HMV is less than or equal to the delta T1 HMV.
Preferably, the flow control module 330 further includes a second difference determining unit, a sixth opening degree control unit and a seventh opening degree control unit; the second difference value judging unit is used for judging whether the T2HMV-T1HMV is larger than the THMV or not if the T2HMV > delta T2HMV and the opening degree of the first electromagnetic valve is larger than or equal to a preset maximum opening value when the T1HMV is larger than the T2 HMV; the sixth opening control unit is used for controlling the opening value of the second electromagnetic valve to reduce the preset opening amount when the T2HMV-T1HMV is greater than the THMV and the opening of the second electromagnetic valve is greater than the preset minimum opening value when the T2HMV > delta T2 HMV; and the seventh opening control unit is used for controlling the opening value of the first electromagnetic valve to increase the preset opening amount when the opening of the first electromagnetic valve is smaller than the preset maximum opening value continuously when the T2HMV is less than or equal to the delta T2 HMV.
Preferably, the flow control module 330 further includes an opening degree judging unit and an eighth opening degree control unit; the opening degree judging unit is used for judging whether the opening degree of the first electromagnetic valve is larger than a preset minimum opening degree value or not when T1HMV is larger than T2HMV and delta T1HMV is smaller than or equal to T1 HMV; the eighth opening degree control unit is used for controlling the opening degree value of the first electromagnetic valve to increase the preset opening degree value when the opening degree of the first electromagnetic valve is larger than the preset minimum opening degree value.
The multi-chamber flow control device of the refrigeration system provided in this embodiment and the multi-chamber flow control method of the refrigeration system provided in any embodiment of the present invention belong to the same inventive concept, and have corresponding beneficial effects, and detailed technical details in this embodiment are not described in the multi-chamber flow control method of the refrigeration system provided in any embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A method of controlling flow in a plurality of compartments of a refrigeration system, comprising:
acquiring the on-off state of each electromagnetic valve in the refrigeration system, the actual temperature of each chamber and the heating output quantity of a heater of each chamber; each chamber is provided with a corresponding preset target temperature, and the chambers correspond to the electromagnetic valves one by one;
determining the temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber;
when the electromagnetic valves corresponding to the chambers are in a conducting state, the temperature difference is in a preset temperature difference range, and the absolute value of the difference value of the heating output quantity between the chambers is larger than a preset threshold value, controlling the opening value of the electromagnetic valve corresponding to each chamber to increase or decrease a preset opening quantity according to the magnitude relation of the heating output quantity of each chamber, the difference value and the current opening value of the electromagnetic valve corresponding to each chamber so as to control the flow of the chambers;
the electromagnetic valves comprise a first electromagnetic valve and a second electromagnetic valve, and the chambers comprise a first chamber corresponding to the first electromagnetic valve and a second chamber corresponding to the second electromagnetic valve;
the controlling the opening value of the electromagnetic valve corresponding to each chamber to increase or decrease a preset opening value according to the magnitude relation of the heating output quantity of each chamber, the difference value and the current opening value of the electromagnetic valve corresponding to each chamber includes:
determining the size relationship of T1HMV and T2HMV when r1=1 and r2=1, Δ T11 ≦ Δ T1 ≦ Δ T12 and Δ T21 ≦ Δ T2 ≦ Δ T21, | T1HMV-T2HMV | > THMV; wherein r1=1 indicates that the first solenoid valve is in an on state, r2=1 indicates that the second solenoid valve is in an on state, Δ T1 is a temperature difference between an actual temperature of the first compartment and a preset target temperature of the first compartment, Δ T2 is a temperature difference between an actual temperature of the second compartment and a preset target temperature of the second compartment, Δ T11 and Δ T12 respectively indicate a minimum value and a maximum value of a preset temperature difference range of Δ T1, Δ T21 and Δ T22 respectively indicate a minimum value and a maximum value of a preset temperature difference range of Δ T2, T1HMV is a heating output of the first compartment, T2HMV is a heating output of the second compartment, and THMV is a preset heating output threshold of | T1HMV-T2HMV |;
when T1HMV is larger than T2HMV, if T1HMV > delta T1HMV and the opening degree of the second electromagnetic valve is smaller than a preset maximum opening degree value, controlling the opening degree value of the second electromagnetic valve to increase a preset opening degree; wherein Δ T1HMV is a target reference value for the heating output of the first compartment;
when the T1HMV is less than or equal to the T2HMV, if the T2HMV > delta T2HMV and the opening degree of the first electromagnetic valve is smaller than a preset maximum opening degree value, controlling the opening degree value of the first electromagnetic valve to increase a preset opening degree; wherein Δ T2HMV is a target reference value for the heating output of the second compartment.
2. The multi-chamber flow control method of a refrigerant system as set forth in claim 1, wherein said controlling the opening value of said second solenoid valve to increase by a preset opening amount comprises:
controlling the second electromagnetic valve to maintain the preset time of the current opening degree;
and when T2HMV-T1HMV > THMV, if T2HMV >. DELTA.T 2HMV and the opening degree of the second electromagnetic valve is greater than a preset minimum opening degree value, controlling the opening degree value of the second electromagnetic valve to reduce a preset opening degree.
3. The multi-chamber flow control method of a refrigerant system as set forth in claim 1, wherein said controlling the opening value of said first solenoid valve to increase by a preset opening amount comprises:
controlling the first electromagnetic valve to maintain the preset time of the current opening degree;
and when T1HMV-T2HMV > THMV, if T1HMV >. DELTA.T 1HMV and the opening degree of the first electromagnetic valve is greater than a preset minimum opening degree value, controlling the opening degree value of the first electromagnetic valve to reduce a preset opening degree.
4. The method of claim 1, wherein determining the size relationship between the T1HMV and the T2HMV comprises:
when T1HMV is larger than T2HMV, if T1HMV > delta T1HMV and the opening degree of the second electromagnetic valve is larger than or equal to a preset maximum opening degree value, whether T1HMV-T2HMV is larger than THMV is judged;
if T1HMV-T2HMV is greater than THMV, when T1HMV > delta T1HMV and the opening degree of the first electromagnetic valve is greater than a preset minimum opening degree value, controlling the opening degree value of the first electromagnetic valve to reduce the preset opening degree value;
when T1HMV is less than or equal to DeltaT 1HMV, the opening degree of the second electromagnetic valve is controlled to be increased by a preset opening degree value when the opening degree of the second electromagnetic valve is smaller than a preset maximum opening degree value.
5. The method of claim 1, wherein determining the size relationship between the T1HMV and the T2HMV comprises:
when T1HMV is larger than T2HMV, if T2HMV > delta T2HMV and the opening degree of the first electromagnetic valve is larger than or equal to a preset maximum opening degree value, whether T2HMV-T1HMV is larger than THMV is judged;
if T2HMV-T1HMV is greater than THMV, when T2HMV > delta T2HMV and the opening degree of the second electromagnetic valve is greater than a preset minimum opening degree value, controlling the opening degree value of the second electromagnetic valve to reduce the preset opening degree value;
when T2HMV is less than or equal to DeltaT 2HMV, the opening degree of the first electromagnetic valve is controlled to be increased by a preset opening degree when the opening degree of the first electromagnetic valve is smaller than a preset maximum opening degree value.
6. The method of claim 1, wherein determining the size relationship between the T1HMV and the T2HMV comprises:
when T1HMV is larger than T2HMV, if T1HMV is smaller than or equal to Delta T1HMV, judging whether the opening degree of the first electromagnetic valve is larger than a preset minimum opening degree value;
and when the opening degree of the first electromagnetic valve is greater than a preset minimum opening degree value, controlling the opening degree value of the first electromagnetic valve to increase a preset opening degree.
7. A multi-chamber flow control apparatus for a refrigeration system, comprising:
the data state acquisition module is used for acquiring the switching state of each electromagnetic valve in the refrigeration system, the actual temperature of each chamber and the heating output quantity of the heater of each chamber; each chamber is provided with a corresponding preset target temperature, and the chambers correspond to the electromagnetic valves one by one;
the temperature difference determining module is used for determining the temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber;
the flow control module is used for controlling the opening value of the electromagnetic valve corresponding to each chamber to increase or decrease a preset opening amount according to the magnitude relation of the heating output quantity of each chamber, the difference value and the current opening value of the electromagnetic valve corresponding to each chamber so as to control the flow of the chambers when the electromagnetic valves corresponding to each chamber are in a conducting state, the temperature difference is within a preset temperature difference range and the absolute value of the difference value of the heating output quantity between the chambers is greater than a preset threshold value;
the electromagnetic valve comprises a first electromagnetic valve and a second electromagnetic valve, and the chambers comprise a first chamber corresponding to the first electromagnetic valve and a second chamber corresponding to the second electromagnetic valve; the flow control module comprises a size relation determining unit, a first opening degree control unit and a second opening degree control unit;
wherein the size relation determining unit is configured to determine the size relation of T1HMV and T2HMV when r1=1 and r2=1, Δ T11 ≦ Δ T1 ≦ Δ T12 and Δ T21 ≦ Δ T2 ≦ Δ T22, | T1HMV-T2HMV | > THMV; wherein r1=1 indicates that the first solenoid valve is in an on state, r2=1 indicates that the second solenoid valve is in an on state, Δ T1 is a temperature difference between an actual temperature of the first compartment and a preset target temperature of the first compartment, Δ T2 is a temperature difference between an actual temperature of the second compartment and a preset target temperature of the second compartment, Δ T11 and Δ T12 respectively indicate a minimum value and a maximum value of a preset temperature difference range of Δ T1, Δ T21 and Δ T22 respectively indicate a minimum value and a maximum value of a preset temperature difference range of Δ T2, T1HMV is a heating output of the first compartment, T2HMV is a heating output of the second compartment, and THMV is a preset heating output threshold value of | T1HMV-T2HMV |;
the first opening control unit is used for controlling the opening value of the second electromagnetic valve to increase a preset opening amount if T1HMV > T2HMV and the opening of the second electromagnetic valve is smaller than a preset maximum opening value when T1HMV > Delta T1 HMV; wherein Δ T1HMV is a target reference value for the heating output of the first compartment;
the second opening control unit is used for controlling the opening value of the first electromagnetic valve to increase the preset opening amount if T2HMV > delta T2HMV and the opening of the first electromagnetic valve is smaller than the preset maximum opening value when T1HMV is smaller than or equal to T2 HMV; wherein Δ T2HMV is a target reference value for the heating output of the second compartment.
8. A refrigeration system, comprising: the variable frequency compressor, the controller, at least two chambers and at least two solenoid valves corresponding to the at least two chambers one by one, wherein the multi-chamber flow control device of the refrigeration system as claimed in claim 7 is integrated in the controller; the electromagnetic valve is electrically connected with the controller, and the variable frequency compressor is connected with the evaporator of the corresponding compartment through a passage where the electromagnetic valve is located.
9. The refrigerant system as set forth in claim 8, wherein said compartment includes a temperature sensor, an evaporator and a heater, said temperature sensor, said evaporator and said heater being electrically connected to said controller.
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