CN112665254A - Control method and device for multi-chamber electronic expansion valve of refrigeration system and refrigeration system - Google Patents
Control method and device for multi-chamber electronic expansion valve of refrigeration system and refrigeration system Download PDFInfo
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- CN112665254A CN112665254A CN202011597105.1A CN202011597105A CN112665254A CN 112665254 A CN112665254 A CN 112665254A CN 202011597105 A CN202011597105 A CN 202011597105A CN 112665254 A CN112665254 A CN 112665254A
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Abstract
The embodiment of the invention discloses a control method and a control device for a multi-chamber electronic expansion valve of a refrigerating system and the refrigerating system, wherein the method comprises the following steps: acquiring the opening and closing state of each electromagnetic valve, the opening degree of each electronic expansion valve, the actual temperature of each compartment, the heating output quantity of a heater of each compartment, and the evaporation temperature and the evaporation pressure of an evaporator of each compartment in the refrigeration system; determining a first temperature difference between the actual temperature of each chamber and a preset target temperature, and determining a second temperature difference between the actual temperature of each chamber and the evaporation temperature; and when the electromagnetic valve corresponding to the chamber is in a conducting state, controlling the opening value of the electronic expansion valve corresponding to the chamber to increase or decrease a preset opening value according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber. The technical scheme provided by the embodiment of the invention can avoid temperature fluctuation of the room, ensure heat transfer temperature difference and system flow, and avoid the change of pressure at the low-pressure end of the system into negative pressure.
Description
Technical Field
The embodiment of the invention relates to a refrigeration technology, in particular to a control method and a control device for a multi-chamber electronic expansion valve of a refrigeration system and the refrigeration system.
Background
The electronic expansion valve adjusts the liquid supply amount of the evaporator according to a preset program, belongs to an electronic adjusting mode, is called as the electronic expansion valve, and is widely applied to a refrigeration system. In a multi-compartment refrigeration system, the flow rate in a passage between a compressor and a compartment is controlled by adjusting the opening degree of an electronic expansion valve in the passage, and if the opening degree of the electronic expansion valve corresponding to the compartment is not properly adjusted, the problems of temperature fluctuation of the compartment and other compartments in an operating state, heat transfer temperature difference and system flow rate abnormity, negative pressure (gauge pressure) change of system low-pressure end pressure and the like are easily caused. Therefore, reliable control of the electronic expansion valves of each compartment in the refrigeration system is required.
At present, in a control method of an existing multi-chamber electronic expansion valve of a refrigeration system, usually, the opening degree of the electronic expansion valve is controlled by performing calculus on a return air superheat degree deviation of the system, or the opening degree of the electronic expansion valve is adjusted according to an inlet and outlet temperature difference of an evaporator, that is, the opening degree of the electronic expansion valve is adjusted only by a single factor, so that the reliability of control is affected, temperature fluctuation of chambers may be caused, and normal operation of each chamber in an operating state in the refrigeration system is affected.
Disclosure of Invention
The embodiment of the invention provides a control method and a control device for a multi-chamber electronic expansion valve of a refrigerating system and the refrigerating system, which are used for avoiding temperature fluctuation of the chambers, ensuring heat transfer temperature difference and system flow and avoiding the change of pressure at a low-pressure end of the system into negative pressure.
In a first aspect, an embodiment of the present invention provides a method for controlling a multi-chamber electronic expansion valve of a refrigeration system, including:
acquiring the opening and closing state of each electromagnetic valve, the opening degree of each electronic expansion valve, the actual temperature of each compartment, the heating output quantity of a heater of each compartment, and the evaporation temperature and the evaporation pressure of an evaporator of each compartment in the refrigeration system; the electromagnetic valves and the electronic expansion valves are in one-to-one correspondence with the chambers, and each chamber is provided with a corresponding preset target temperature;
determining a first temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber, and determining a second temperature difference between the actual temperature of each chamber and the corresponding evaporation temperature;
and when the electromagnetic valve corresponding to the chamber is in a conducting state, controlling the opening value of the electronic expansion valve corresponding to the chamber to increase or decrease a preset opening value according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber.
Optionally, the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber;
controlling the opening value of the electronic expansion valve corresponding to the chamber to reduce the preset opening amount according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber, and the method comprises the following steps:
when r1 is equal to 1 and the current opening degree of the first electronic expansion valve is greater than a preset first minimum opening degree, if T1_ PV is less than or equal to T _ PV _ EVAP, T1_ PV-T1_ EVA is less than T1, P _ EVAP _1 is more than or equal to P1, and EV1 is less than or equal to EV1_ T +1, controlling the opening degree of the first electronic expansion valve to be reduced by a preset opening amount every preset time; wherein r1 ═ 1 denotes that the first solenoid valve is in the on state, T1_ PV is the actual temperature of the first compartment, T _ PV _ EVAP is the preset temperature difference control value, T1_ EVA is the evaporation temperature of the first compartment, T1_ PV-T1_ EVA is the second temperature difference of the first compartment, T1 is the preset first temperature difference corresponding to the first temperature difference, P _ EVAP _1 and P1 are the evaporation pressure and the preset pressure of the first compartment, and EV1 and EV1_ T are the current opening degree and the target opening degree of the first electronic expansion valve, respectively.
Optionally, the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber;
controlling the opening value of the electronic expansion valve corresponding to the chamber to reduce the preset opening amount according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber, and the method comprises the following steps:
when r1 is equal to 1 and the current opening degree of the first electronic expansion valve is greater than a preset first minimum opening degree, if delta T11 is equal to or less than delta T1 is equal to or less than delta T12, T1HMV is equal to or greater than K delta T1HMV, T1_ PV > T _ PV _ EVAP, r2 is equal to 1, delta T2 > -delta T, T2_ SV < T _ PV _ EVAP, EV1_ T-EV2_ T is equal to or greater than EV _ T, P _ EVAP _1 is equal to or greater than P1, and EV1 is equal to or less than EV1_ T +1, the opening degree of the first electronic expansion valve is controlled to be reduced by a preset opening amount every preset time; where r1 ═ 1 denotes that the first solenoid valve is in an on state, Δ T1 denotes a first temperature difference of the first compartment, Δ T11 and Δ T12 are respectively a preset minimum value and a preset maximum value of Δ T1, T1HMV and Δ T1HMV denote a heating output and a target reference value of the first compartment, K denotes a coefficient, T1_ PV denotes an actual temperature of the first compartment, T _ PV _ EVAP denotes a preset temperature difference control value, r2 ═ 1 denotes that the second solenoid valve is in an on state, Δ T2 denotes a first temperature difference of the second compartment, T denotes a preset minimum value of Δ T2, T2_ SV denotes a preset target temperature of the second compartment, P _ EVAP _1 and P1 denote an evaporation pressure and a preset pressure of the first compartment, EV1 and EV1_ T denote a current opening and a target opening of the first compartment, EV1_ T denotes a current opening and a target opening of the first compartment, a preset threshold value of the second electronic expansion valve is a preset target opening value, and EV 4625 _ T _2 denotes a target opening of the second electronic expansion valve.
Optionally, the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber;
controlling the opening value of the electronic expansion valve corresponding to the chamber to increase a preset opening amount according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber, and the method comprises the following steps:
when r1 is equal to 1 and the current opening degree of the first electronic expansion valve is smaller than the preset first maximum opening degree, if P _ EVAP _1 is less than P1, T1_ PV is less than or equal to T _ PV _ EVAP, T1_ PV-T1_ EVA is greater than T2 and EV1 is greater than or equal to EV1_ T-1, or if P _ EVAP _1 is less than P1, T1_ PV is greater than T _ PV _ EVAP and EV1 is greater than or equal to EV1_ T-1, controlling the opening degree of the first electronic expansion valve to be increased by a preset opening amount every preset time; wherein r1 ═ 1 indicates that the first solenoid valve is in an on state, T1_ PV is the actual temperature of the first compartment, T _ PV _ EVAP is the preset temperature difference control value, T1_ EVA is the evaporation temperature of the first compartment, T1_ PV-T1_ EVA is the second temperature difference of the first compartment, T2 is the preset second temperature difference corresponding to the first temperature difference, P _ EVAP _1 and P1 are the evaporation pressure and the preset pressure of the first compartment, and EV1 and EV1_ T are the current opening degree and the target opening degree of the first electronic expansion valve, respectively.
Optionally, the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber;
controlling the opening value of the electronic expansion valve corresponding to the chamber to reduce the preset opening amount according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber, and the method comprises the following steps:
when r2 is equal to 1 and the current opening degree of the second electronic expansion valve is greater than the preset second minimum opening degree, if T2_ PV is less than or equal to T _ PV _ EVAP, T2_ PV-T2_ EVA is less than T1, P _ EVAP _2 is greater than or equal to P2, and EV2 is less than or equal to EV2_ T +1, controlling the opening degree of the second electronic expansion valve to be reduced by a preset opening amount every preset time; where r2 ═ 1 indicates that the second solenoid valve is in the on state, T2_ PV is the actual temperature of the second compartment, T2_ EVA is the evaporation temperature of the second compartment, T2_ PV-T2_ EVA is the second temperature difference of the second compartment, P _ evap _2 and P2 are the evaporation pressure and the preset pressure of the second compartment, respectively, and EV2 and EV2_ T are the current opening degree and the target opening degree of the second electronic expansion valve, respectively.
Optionally, the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber;
controlling the opening value of the electronic expansion valve corresponding to the chamber to reduce the preset opening amount according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber, and the method comprises the following steps:
when r2 is equal to 1 and the current opening degree of the second electronic expansion valve is greater than a preset second minimum opening degree, if delta T21 is equal to or less than delta T2 is equal to or less than delta T22, T2HMV is equal to or greater than K delta T2HMV, T2_ PV > T _ PV _ EVAP, r1 is equal to 1, delta T1 > -delta T, T1_ SV < T _ PV _ EVAP, EV2_ T-EV1_ T is equal to or greater than EV _ T, P _ EVAP _2 is equal to or greater than P2, and EV2 is equal to or less than EV1_ T +1, the opening degree of the second electronic expansion valve is controlled to be reduced by a preset opening amount every preset time; where r2 is 1, Δ T2 is a first temperature difference of the second compartment, Δ T11 and Δ T12 are a preset minimum value and a preset maximum value of Δ T1, respectively, T1HMV and Δ T1HMV are a heating output and a target reference value of the first compartment, respectively, K is a coefficient, T2_ PV is an actual temperature of the second compartment, T _ PV _ EVAP is a preset temperature difference control value, r1 is 1, which indicates that the first solenoid valve is in an on state, Δ T1 is a first temperature difference of the first compartment, Δ T is a preset minimum value of Δ T1, T1_ SV is a preset target temperature of the first compartment, T2_ T is a target opening degree of the second electronic expansion valve, EV2 is a current opening degree of the second electronic expansion valve, EV1_ T is a target opening degree of the first electronic expansion valve, difference _ T is a preset threshold value, P _ P2 is a preset opening degree of the first electronic expansion valve, and a preset pressure of the second compartment 2, respectively.
Optionally, the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber;
controlling the opening value of the electronic expansion valve corresponding to the chamber to increase a preset opening amount according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber, and the method comprises the following steps:
when r2 is equal to 1 and the current opening degree of the second electronic expansion valve is smaller than the preset second maximum opening degree, if P _ EVAP _2 is less than P2, T2_ PV is less than or equal to T _ PV _ EVAP, T2_ PV-T2_ EVA is greater than T2 and EV2 is greater than or equal to EV2_ T-1, or if P _ EVAP _2 is less than P2, T2_ PV is greater than T _ PV _ EVAP and EV2 is greater than or equal to EV2_ T-1, controlling the opening degree of the second electronic expansion valve to be increased by a preset opening amount every preset time; wherein r2 ═ 1 indicates that the second solenoid valve is in an on state, P _ EVAP _2 and P2 are respectively the evaporation pressure and the preset pressure of the second compartment, T2_ PV is the actual temperature of the second compartment, T _ PV _ EVAP is the preset temperature difference control value, T2_ PV is the actual temperature of the second compartment, T2_ EVA is the evaporation temperature of the second compartment, T2_ PV-T2_ EVA is the second temperature difference of the second compartment, T2 is the preset second temperature difference value corresponding to the first temperature difference, EV2 is the current opening degree of the second electronic expansion valve, and EV2_ T is the target opening degree of the second electronic expansion valve.
In a second aspect, an embodiment of the present invention further provides a control device for a multi-chamber electronic expansion valve of a refrigeration system, including:
the information acquisition module is used for acquiring the on-off state of each electromagnetic valve, the opening degree of each electronic expansion valve, the actual temperature of each compartment, the heating output quantity of a heater of each compartment, and the evaporation temperature and the evaporation pressure of an evaporator of each compartment in the refrigeration system; the electromagnetic valves and the electronic expansion valves are in one-to-one correspondence with the chambers, and each chamber is provided with a corresponding preset target temperature;
the temperature difference determining module is used for determining a first temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber, and determining a second temperature difference between the actual temperature of each chamber and the corresponding evaporation temperature;
and the opening control module is used for controlling the opening value of the electronic expansion valve corresponding to the chamber to increase or decrease the preset opening value according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber when the electromagnetic valve corresponding to the chamber is in a conducting state.
In a third aspect, an embodiment of the present invention further provides a refrigeration system, including: the control device of the refrigeration system multi-chamber electronic expansion valve is integrated in the controller, and the control device comprises a variable frequency compressor, a controller, at least two electromagnetic valves and at least two electronic expansion valves, wherein the at least two electromagnetic valves correspond to at least two chambers one to one; the electromagnetic valve and the electronic expansion valve are both electrically connected with the controller, and the variable frequency compressor is connected with the evaporator of the corresponding compartment through the electromagnetic valve.
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 control method and device for the multi-chamber electronic expansion valve of the refrigeration system and the refrigeration system, the on-off state of each electromagnetic valve in the refrigeration system, the opening degree of each electronic expansion valve, the actual temperature of each chamber, the heating output quantity of a heater of each chamber, and the evaporation temperature and the evaporation pressure of an evaporator of each chamber are obtained; the electromagnetic valves and the electronic expansion valves are in one-to-one correspondence with the chambers, and each chamber is provided with a corresponding preset target temperature; determining a first temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber, and determining a second temperature difference between the actual temperature of each chamber and the corresponding evaporation temperature; and when the electromagnetic valve corresponding to the chamber is in a conducting state, controlling the opening value of the electronic expansion valve corresponding to the chamber to increase or decrease a preset opening value according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber. According to the control method and the control device for the multi-chamber electronic expansion valve of the refrigeration system and the refrigeration system, the opening value of the electronic expansion valve corresponding to the chamber is controlled to increase or decrease the preset opening value according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber, so that temperature fluctuation of other chambers is avoided, heat transfer temperature difference and system flow are ensured, and the pressure of the low-pressure end of the system is prevented from being changed into negative pressure.
Drawings
Fig. 1 is a flowchart of a control method for a multi-chamber electronic expansion valve of a refrigeration system according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a multi-chamber electronic expansion valve 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 control device for a multi-chamber electronic expansion valve 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 control method for a multi-chamber electronic expansion valve of a refrigeration system according to an embodiment of the present invention, where the embodiment is applicable to aspects such as controlling each chamber electronic expansion valve of the refrigeration system, and the method may be implemented by a control device for a multi-chamber electronic expansion valve of a refrigeration system, where the device may be implemented by software and/or hardware, and the device may be integrated in an electronic device, such as a computer, having a control function for the multi-chamber electronic expansion valve of the refrigeration system, and the method specifically includes the following steps:
and step 110, acquiring the opening and closing states of the electromagnetic valves, the opening degrees of the electronic expansion valves, the actual temperature of each compartment, the heating output quantity of the heaters of each compartment, and the evaporation temperature and the evaporation pressure of the evaporators of each compartment in the refrigeration system.
The electromagnetic valves and the electronic expansion valves are in one-to-one correspondence with the chambers, the chambers are provided with corresponding preset target temperatures, and the preset target temperatures arranged in the chambers can be the same or different. The control device of the multi-chamber electronic expansion valve of the refrigeration system can acquire the actual temperature of each chamber through a port which is arranged by the control device and electrically connected with the temperature sensor of each chamber, and can acquire the opening degree of each electronic expansion valve through a port which is arranged by the control device and electrically connected with each electronic expansion valve so as to control the opening degree of each electronic expansion valve.
And step 120, determining a first temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber, and determining a second temperature difference between the actual temperature of each chamber and the corresponding evaporation temperature.
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 valve corresponding to the chamber is in a conducting state, controlling the opening value of the electronic expansion valve corresponding to the chamber to increase or decrease a preset opening value according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber.
Specifically, for example, the refrigeration system includes two chambers, namely 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, the first chamber and the second chamber respectively correspond to a first electronic expansion valve and a second electronic expansion valve, the first solenoid valve and the first electronic expansion valve are in the same passage, and the second solenoid valve and the second electronic expansion valve are in the same passage. For example, when r1 is equal to 1 (i.e., the first solenoid valve is in a conducting state), and the current opening degree of the first electronic expansion valve is greater than a preset first minimum opening degree, if the actual temperature of the first chamber is less than or equal to a preset temperature difference control value, the second temperature difference of the first chamber is less than the corresponding preset first temperature difference value, the evaporation pressure of the first chamber is greater than or equal to a preset pressure, and the current opening degree of the first electronic expansion valve is less than or equal to a target opening degree, the opening degree of the first electronic expansion valve is controlled to decrease by a preset opening degree every preset time, so as to avoid causing temperature fluctuation (exceeding ± 0.2 ℃) of the second chamber, ensure the heat transfer temperature difference and the system flow, and avoid the pressure at the low-pressure end of the system becoming negative pressure.
In the control method of the multi-chamber electronic expansion valve of the refrigeration system provided in this embodiment, when the electromagnetic valve corresponding to the chamber is in the on state, the opening value of the electronic expansion valve corresponding to the chamber is controlled to increase or decrease the preset opening amount according to the first temperature difference, the second temperature difference, the heating output amount of the chamber, and the current opening value of the electronic expansion valve corresponding to the chamber, so as to avoid temperature fluctuation of other chambers, ensure the heat transfer temperature difference and the system flow, and avoid the low-pressure end pressure of the system changing into negative pressure.
Example two
Fig. 2 is a flowchart of a control method for a multi-chamber electronic expansion valve of a refrigeration system according to a second embodiment of the present invention, where the present embodiment is applicable to aspects such as controlling each chamber electronic expansion valve of the refrigeration system, and the method may be implemented by a control device for a multi-chamber electronic expansion valve of a refrigeration system, where the control device may be implemented by software and/or hardware, and the control device may be integrated in an electronic device, such as a computer, having a control function of the multi-chamber electronic expansion valve of the refrigeration system, and the method specifically includes the following steps:
and step 210, acquiring the opening and closing states of the electromagnetic valves, the opening degrees of the electronic expansion valves, the actual temperature of each compartment, the heating output quantity of the heaters of each compartment, and the evaporation temperature and the evaporation pressure of the evaporators of each compartment in the refrigeration system.
The electromagnetic valves and the electronic expansion valves are in one-to-one correspondence with the chambers, the chambers are provided with corresponding preset target temperatures, and the preset target temperatures arranged in the chambers can be the same or different. Fig. 3 is a schematic structural diagram of a refrigeration system according to a second embodiment of the present invention, referring to fig. 3, the refrigeration system includes an inverter compressor 10, a controller 20, at least two chambers 30, at least two solenoid valves 40 corresponding to the at least two chambers one to one, and at least two electronic expansion valves 50 corresponding to the at least two chambers one to one, and a control device of the multi-chamber electronic expansion valve of the refrigeration system is integrated in the controller 20; the electromagnetic valve 40 and the electronic expansion valve 50 are both electrically connected to the controller 20, and the inverter compressor 10 is connected to the evaporator 60 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 includes a temperature sensor 70, an evaporator 60 and a heater 80, and the temperature sensor 70, the evaporator 60 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 first electromagnetic valve 41 and the first electronic expansion valve 51 are in the same passage, the second electromagnetic valve 42 and the second electronic expansion valve 52 are in the same passage, the inverter compressor 10 is connected with the evaporator 61 of the first compartment 31 through the passage where the first electromagnetic valve 41 is located and is connected with the evaporator 62 of the second compartment 32 through the passage where the second electromagnetic valve 42 is located, the inverter compressor 10 compresses sucked gas and transmits the compressed gas to the condenser 90 through a gas pipeline for condensation, so that the condensed refrigerant is transmitted to the first compartment 31 through the passage where the first electromagnetic valve 41 is located and is transmitted to the second compartment 32 through the passage where the second electromagnetic valve 42 is located. The control device of the multi-compartment electronic expansion valve of the refrigeration system integrated in the controller 20 may acquire the temperature of the corresponding compartment 30 through the temperature sensor 70, and may further acquire the heating output amount of the heater 80, the evaporation temperature of the evaporator 60, and the evaporation pressure to control the opening degree of each electronic expansion valve 50.
The temperature unit may be celsius, the preset target temperatures of the compartments 30 may be the same or different, and the specific values of the preset target temperatures may be set according to actual conditions, which is not limited herein.
And step 230, when r1 is equal to 1 and the current opening degree of the first electronic expansion valve is greater than the preset first minimum opening degree, if T1_ PV is less than or equal to T _ PV _ EVAP, T1_ PV-T1_ EVA is less than T1, P _ EVAP _1 is greater than or equal to P1, and EV1 is less than or equal to EV1_ T +1, controlling the opening degree of the first electronic expansion valve to be reduced by the preset opening degree every preset time.
Where r1 ═ 1 indicates that the first electromagnetic valve 41 is in an on state, T1_ PV is the actual temperature of the first compartment 31, T _ PV _ EVAP is the preset temperature difference control value, T1_ EVA is the evaporation temperature of the first compartment 31, T1_ PV-T1_ EVA is the second temperature difference of the first compartment 31, T1 is the preset first temperature difference value corresponding to the first temperature difference, P _ EVAP _1 and P1 are the evaporation pressure and the preset pressure of the first compartment 31, and EV1 and EV1_ T are the current opening degree and the target opening degree of the first electronic expansion valve 51, respectively. When the above condition in this step is satisfied, the opening degree of the first electronic expansion valve 51 may be controlled to be decreased by a preset opening amount every preset time.
In addition, when r1 is equal to 1 and the current opening degree of the first electronic expansion valve 51 is greater than the preset first minimum opening degree, if Δ T11 is equal to or less than Δ T1 is equal to or less than Δ T12, T1HMV is equal to or greater than K × Δ T1HMV, T1_ PV > T _ PV _ EVAP, r2 is equal to 1, Δ T2 > - Δ T, T2_ SV < T _ PV _ EVAP, EV1_ T-EV2_ T is equal to or greater than EV _ T, P _ EVAP _1 is equal to or greater than P1, and EV1 EV is equal to or less than 1_ T +1, the opening degree of the first electronic expansion valve 51 may be controlled to be decreased by a preset opening amount every preset time; where Δ T1 is a first temperature difference of the first compartment 31, Δ T11 and Δ T12 are a preset minimum value and a preset maximum value of Δ T1, respectively, T1HMV and Δ T1HMV are a heating output and a target reference value of the first compartment 31, respectively, K is a coefficient, r2 ═ 1 indicates that Δ T2 is the first temperature difference of the second compartment 32 in the on state of the second solenoid valve 42, Δ T is a preset minimum value of Δ T2, T2_ SV is a preset target temperature of the second compartment 32, EV _ T is a preset opening difference threshold value, and EV2_ T is a target opening of the second electronic expansion valve 52.
And 240, when r1 is equal to 1 and the current opening degree of the first electronic expansion valve is smaller than the preset first maximum opening degree, if P _ EVAP _1 is smaller than P1, T1_ PV is smaller than or equal to T _ PV _ EVAP, T1_ PV-T1_ EVA is larger than T2 and EV1 is larger than or equal to EV1_ T-1, or if P _ EVAP _1 is smaller than P1, T1_ PV is larger than T _ PV _ EVAP and EV1 is larger than or equal to EV1_ T-1, controlling the opening degree of the first electronic expansion valve to be increased by a preset opening amount at preset time intervals.
Where r1 ═ 1 indicates that the first electromagnetic valve 41 is in an on state, T1_ PV is the actual temperature of the first compartment 31, T _ PV _ EVAP is the preset temperature difference control value, T1_ EVA is the evaporation temperature of the first compartment 31, T1_ PV-T1_ EVA is the second temperature difference of the first compartment 31, T2 is the preset second temperature difference value corresponding to the first temperature difference, P _ EVAP _1 and P1 are the evaporation pressure and the preset pressure of the first compartment 31, and EV1 and EV1_ T are the current opening degree and the target opening degree of the first electronic expansion valve 51, respectively. When the above condition in this step is satisfied, the opening degree of the first electronic expansion valve 51 may be controlled to be increased by a preset opening amount every preset time.
And step 250, when r2 is equal to 1 and the current opening degree of the second electronic expansion valve is greater than the preset second minimum opening degree, if T2_ PV is less than or equal to T _ PV _ EVAP, T2_ PV-T2_ EVA is less than T1, P _ EVAP _2 is greater than or equal to P2, and EV2 is less than or equal to EV2_ T +1, controlling the opening degree of the second electronic expansion valve to be reduced by the preset opening degree every preset time.
Where r2 ═ 1 indicates that the second solenoid valve 42 is in the on state, T2_ PV is the actual temperature of the second compartment 32, T2_ EVA is the evaporation temperature of the second compartment 32, T2_ PV-T2_ EVA is the second temperature difference of the second compartment 32, P _ evap _2 and P2 are the evaporation pressure and the preset pressure of the second compartment 32, respectively, and EV2 and EV2_ T are the current opening degree and the target opening degree of the second electronic expansion valve 52, respectively. When the above condition in this step is satisfied, the opening degree of the second electronic expansion valve 52 may be controlled to be decreased by a preset opening amount every preset time.
When r2 is equal to 1 and the current opening degree of the second electronic expansion valve 52 is greater than the preset second minimum opening degree, if Δ T21 is equal to or less than Δ T2, equal to or less than Δ T22, T2HMV is equal to or greater than K × Δ T2HMV, T2_ PV > T _ PV _ EVAP, r1 is equal to 1, Δ T1 > - Δ T, T1_ SV < T _ PV _ EVAP, EV2_ T-EV1_ T is equal to or greater than EV _ T, P _ EVAP _2, equal to or greater than P2, and EV2 is equal to or less than EV1_ T +1, the opening degree of the second electronic expansion valve 52 may be controlled to be decreased by a preset opening amount every preset time; where Δ T2 is a first temperature difference of the second chamber 32, Δ T11 and Δ T12 are a preset minimum value and a preset maximum value of Δ T1, respectively, T1HMV and Δ T1HMV are a heating output amount and a target reference value of the first chamber 31, respectively, K is a coefficient, r1 ═ 1 indicates that the first solenoid valve 41 is in an on state, Δ T1 is a first temperature difference of the first chamber 31, Δ T is a preset minimum value of Δ T1, T1_ SV is a preset target temperature of the first chamber 31, EV2_ T is a target opening degree of the second electronic expansion valve 52, EV2 is a current opening degree of the second electronic expansion valve 52, EV1_ T is a target opening degree of the first electronic expansion valve 51, and EV _ T is a preset opening degree difference threshold.
And step 260, when r2 is equal to 1 and the current opening degree of the second electronic expansion valve is smaller than the preset second maximum opening degree, if P _ EVAP _2 is smaller than P2, T2_ PV is smaller than or equal to T _ PV _ EVAP, T2_ PV-T2_ EVA is larger than T2 and EV2 is larger than or equal to EV2_ T-1, or if P _ EVAP _2 is smaller than P2, T2_ PV is larger than T _ PV _ EVAP and EV2 is larger than or equal to EV2_ T-1, controlling the opening degree of the second electronic expansion valve to be increased by a preset opening amount at preset time intervals.
Where r2 is equal to 1, which indicates that the second solenoid valve 42 is in the on state, P _ EVAP _2 and P2 are respectively the evaporation pressure and the preset pressure of the second compartment 32, T2_ PV is the actual temperature of the second compartment 32, T _ PV _ EVAP is the preset temperature difference control value, T2_ PV is the actual temperature of the second compartment 32, T2_ EVA is the evaporation temperature of the second compartment 32, T2_ PV-T2_ EVA is the second temperature difference of the second compartment 32, T2 is the preset second temperature difference value corresponding to the first temperature difference, EV2 is the current opening degree EV of the second electronic expansion valve 52, and EV2_ T is the target opening degree of the second electronic expansion valve 52. When the above condition in this step is satisfied, the opening degree of the second electronic expansion valve 52 may be controlled to be increased by a preset opening amount every preset time.
It should be noted that preset values such as the preset first minimum opening, the preset first maximum opening, the preset second minimum opening, the preset second maximum opening, the preset time, and the preset opening amount may be specifically set according to actual situations, and are not limited herein.
In the control method of the multi-chamber electronic expansion valve of the refrigeration system provided in this embodiment, when the first electromagnetic valve corresponding to the first chamber is in a conducting state, the opening value of the first electronic expansion valve is controlled to increase the preset opening amount or decrease the preset opening amount according to the first temperature difference, the second temperature difference, the heating output amount of the first heater, and the current opening value of the first electronic expansion valve, so as to avoid temperature fluctuation of other chambers, ensure heat transfer temperature difference and system flow, and avoid the pressure at the low-pressure end of the system changing into negative pressure.
EXAMPLE III
Fig. 4 is a block diagram of a control device for a multi-chamber electronic expansion valve of a refrigeration system according to a third embodiment of the present invention, where the control device includes an information obtaining module 310, a temperature difference determining module 320, and an opening degree control module 330; the information acquiring module 310 is configured to acquire an on-off state of each electromagnetic valve, an opening degree of each electronic expansion valve, an actual temperature of each compartment, a heating output of a heater of each compartment, an evaporation temperature and an evaporation pressure of an evaporator of each compartment in the refrigeration system; the electromagnetic valves and the electronic expansion valves are in one-to-one correspondence with the chambers, and each chamber is provided with a corresponding preset target temperature; the temperature difference determining module 320 is configured to determine a first temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber, and determine a second temperature difference between the actual temperature of each chamber and the corresponding evaporation temperature; the opening control module 330 is configured to, when the solenoid valve corresponding to the chamber is in a conducting state, control an opening value of the electronic expansion valve corresponding to the chamber to increase or decrease a preset opening amount according to the first temperature difference, the second temperature difference, the heating output amount of the chamber, and the current opening value of the electronic expansion valve corresponding to the chamber.
On the basis of the above embodiment, the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the compartment includes a first compartment and a second compartment; the opening degree control module 330 comprises a first opening degree control unit, wherein the first opening degree control unit is used for controlling the opening degree of the first electronic expansion valve to be reduced by a preset opening amount every preset time if T1_ PV is less than or equal to T _ PV _ EVAP, T1_ PV-T1_ EVA is less than T1, P _ EVAP _1 is greater than or equal to P1, and EV1 is less than or equal to EV1_ T +1 when r1 is equal to 1 and the current opening degree of the first electronic expansion valve is greater than a preset first minimum opening degree; wherein r1 ═ 1 denotes that the first solenoid valve is in the on state, T1_ PV is the actual temperature of the first compartment, T _ PV _ EVAP is the preset temperature difference control value, T1_ EVA is the evaporation temperature of the first compartment, T1_ PV-T1_ EVA is the second temperature difference of the first compartment, T1 is the preset first temperature difference corresponding to the first temperature difference, P _ EVAP _1 and P1 are the evaporation pressure and the preset pressure of the first compartment, and EV1 and EV1_ T are the current opening degree and the target opening degree of the first electronic expansion valve, respectively.
Preferably, the solenoid valves include a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber; the opening control module 330 includes a second opening control unit, configured to, when r1 is equal to 1 and the current opening of the first electronic expansion valve is greater than a preset first minimum opening, control the opening of the first electronic expansion valve to decrease the preset opening amount every preset time if Δ T11 is equal to or less than Δ T1 is equal to or less than Δ T12, T1HMV is equal to or greater than K Δ T1HMV, T1_ PV > T _ EVAP, r2 is equal to 1, Δ T2 > - Δ T, T2_ SV < T _ PV _ EVAP, EV1_ T-2 _ T is equal to or greater than EV _ T, P _ EVAP _1 is equal to or greater than P1, and EV1 is equal to or less than 1_ T + 1; where r1 ═ 1 denotes that the first solenoid valve is in an on state, Δ T1 denotes a first temperature difference of the first compartment, Δ T11 and Δ T12 are respectively a preset minimum value and a preset maximum value of Δ T1, T1HMV and Δ T1HMV denote a heating output and a target reference value of the first compartment, K denotes a coefficient, T1_ PV denotes an actual temperature of the first compartment, T _ PV _ EVAP denotes a preset temperature difference control value, r2 ═ 1 denotes that the second solenoid valve is in an on state, Δ T2 denotes a first temperature difference of the second compartment, T denotes a preset minimum value of Δ T2, T2_ SV denotes a preset target temperature of the second compartment, P _ EVAP _1 and P1 denote an evaporation pressure and a preset pressure of the first compartment, EV1 and EV1_ T denote a current opening and a target opening of the first compartment, EV1_ T denotes a current opening and a target opening of the first compartment, a preset threshold value of the second electronic expansion valve is a preset target opening value, and EV 4625 _ T _2 denotes a target opening of the second electronic expansion valve.
Preferably, the solenoid valves include a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber; the opening control module 330 includes a third opening control unit, configured to, when r1 is equal to 1 and the current opening of the first electronic expansion valve is smaller than a preset first maximum opening, control the opening of the first electronic expansion valve to increase a preset opening amount every preset time if P _ EVAP _1 is less than P1, T1_ PV is less than or equal to T _ PV _ EVAP, T1_ PV-T1_ EVA > T2, and EV1 is greater than or equal to EV1_ T-1, or, if P _ EVAP _1 is less than P1, T1_ PV > T _ EVAP, and EV1 is greater than or equal to 1_ T-1; wherein r1 ═ 1 indicates that the first solenoid valve is in an on state, T1_ PV is the actual temperature of the first compartment, T _ PV _ EVAP is the preset temperature difference control value, T1_ EVA is the evaporation temperature of the first compartment, T1_ PV-T1_ EVA is the second temperature difference of the first compartment, T2 is the preset second temperature difference corresponding to the first temperature difference, P _ EVAP _1 and P1 are the evaporation pressure and the preset pressure of the first compartment, and EV1 and EV1_ T are the current opening degree and the target opening degree of the first electronic expansion valve, respectively.
In one embodiment, the solenoid valve comprises a first solenoid valve and a second solenoid valve, the electronic expansion valve comprises a first electronic expansion valve and a second electronic expansion valve, and the chamber comprises a first chamber and a second chamber; the opening control module 330 includes a fourth opening control unit, configured to, when r2 is equal to 1 and the current opening of the second electronic expansion valve is greater than the preset second minimum opening, control the opening of the second electronic expansion valve to decrease the preset opening amount every preset time if T2_ PV is less than or equal to T _ PV _ EVAP, T2_ PV-T2_ EVA is less than T1, P _ EVAP _2 is greater than or equal to P2, and EV2 is less than or equal to EV2_ T + 1; where r2 ═ 1 indicates that the second solenoid valve is in the on state, T2_ PV is the actual temperature of the second compartment, T2_ EVA is the evaporation temperature of the second compartment, T2_ PV-T2_ EVA is the second temperature difference of the second compartment, P _ evap _2 and P2 are the evaporation pressure and the preset pressure of the second compartment, respectively, and EV2 and EV2_ T are the current opening degree and the target opening degree of the second electronic expansion valve, respectively.
Preferably, the solenoid valves include a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber; the opening degree control module 330 includes a fifth opening degree control unit, configured to, when r2 is equal to 1 and the current opening degree of the second electronic expansion valve is greater than a preset second minimum opening degree, control the opening degree of the second electronic expansion valve to decrease the preset opening degree every preset time if Δ T21 is equal to or less than Δ T2 is equal to or less than Δ T22, T2HMV is equal to or greater than K Δ T2HMV, T2_ PV > T _ PV _ EVAP, r1 is equal to 1, Δ T1 is greater than Δ T, T1_ SV < T _ PV _ EVAP, EV2_ T-1 _ T is equal to or greater than EV _ T, P _ EVAP _2 is equal to or greater than P2, and EV2 is equal to or less than 1_ T + 1; where r2 is 1, Δ T2 is a first temperature difference of the second compartment, Δ T11 and Δ T12 are a preset minimum value and a preset maximum value of Δ T1, respectively, T1HMV and Δ T1HMV are a heating output and a target reference value of the first compartment, respectively, K is a coefficient, T2_ PV is an actual temperature of the second compartment, T _ PV _ EVAP is a preset temperature difference control value, r1 is 1, which indicates that the first solenoid valve is in an on state, Δ T1 is a first temperature difference of the first compartment, Δ T is a preset minimum value of Δ T1, T1_ SV is a preset target temperature of the first compartment, T2_ T is a target opening degree of the second electronic expansion valve, EV2 is a current opening degree of the second electronic expansion valve, EV1_ T is a target opening degree of the first electronic expansion valve, difference _ T is a preset threshold value, P _ P2 is a preset opening degree of the first electronic expansion valve, and a preset pressure of the second compartment 2, respectively.
Preferably, the solenoid valves include a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber; the opening degree control module 330 comprises a sixth opening degree control unit, wherein the sixth opening degree control unit is used for controlling the opening degree of the second electronic expansion valve to be increased by a preset opening degree every preset time when r2 is equal to 1 and the current opening degree of the second electronic expansion valve is smaller than a preset second maximum opening degree, if P _ EVAP _2 is smaller than P2, T2_ PV is smaller than or equal to T _ PV _ EVAP, T2_ PV-T2_ EVA > T2 and EV2 is larger than or equal to EV2_ T-1, or if P _ EVAP _2 is smaller than P2, T2_ PV > T _ EVAP and EV2 is larger than or equal to EV2_ T-1; wherein r2 ═ 1 indicates that the second solenoid valve is in an on state, P _ EVAP _2 and P2 are respectively the evaporation pressure and the preset pressure of the second compartment, T2_ PV is the actual temperature of the second compartment, T _ PV _ EVAP is the preset temperature difference control value, T2_ PV is the actual temperature of the second compartment, T2_ EVA is the evaporation temperature of the second compartment, T2_ PV-T2_ EVA is the second temperature difference of the second compartment, T2 is the preset second temperature difference value corresponding to the first temperature difference, EV2 is the current opening degree of the second electronic expansion valve, and EV2_ T is the target opening degree of the second electronic expansion valve.
The control device of the multi-chamber electronic expansion valve of the refrigeration system provided by the embodiment of the invention and the control method of the multi-chamber electronic expansion valve of the refrigeration system provided by any embodiment of the invention belong to the same inventive concept, and have corresponding beneficial effects, and detailed technical details in the embodiment are not referred to in the control method of the multi-chamber electronic expansion valve of the refrigeration system provided by any embodiment of the 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 (10)
1. A method for controlling a multi-chamber electronic expansion valve of a refrigeration system, comprising:
acquiring the opening and closing state of each electromagnetic valve, the opening degree of each electronic expansion valve, the actual temperature of each compartment, the heating output quantity of a heater of each compartment, and the evaporation temperature and the evaporation pressure of an evaporator of each compartment in the refrigeration system; the electromagnetic valves and the electronic expansion valves are in one-to-one correspondence with the chambers, and each chamber is provided with a corresponding preset target temperature;
determining a first temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber, and determining a second temperature difference between the actual temperature of each chamber and the corresponding evaporation temperature;
and when the electromagnetic valve corresponding to the chamber is in a conducting state, controlling the opening value of the electronic expansion valve corresponding to the chamber to increase or decrease a preset opening value according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber.
2. The control method for a multi-chamber electronic expansion valve of a refrigeration system according to claim 1, wherein the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber;
the controlling the opening value of the electronic expansion valve corresponding to the chamber to reduce the preset opening amount according to the first temperature difference, the second temperature difference, the heating output amount of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber includes:
when r1 is equal to 1 and the current opening degree of the first electronic expansion valve is greater than a preset first minimum opening degree, if T1_ PV is less than or equal to T _ PV _ EVAP, T1_ PV-T1_ EVA is less than T1, P _ EVAP _1 is more than or equal to P1, and EV1 is less than or equal to EV1_ T +1, controlling the opening degree of the first electronic expansion valve to be reduced by a preset opening amount every preset time; wherein r1 ═ 1 indicates that the first electromagnetic valve is in an on state, T1_ PV is the actual temperature of the first compartment, T _ PV _ EVAP is a preset temperature difference control value, T1_ EVA is the evaporation temperature of the first compartment, T1_ PV-T1_ EVA is the second temperature difference of the first compartment, T1 is a preset first temperature difference value corresponding to the first temperature difference, P _ EVAP _1 and P1 are the evaporation pressure and the preset pressure of the first compartment, and 1 and EV1 EV _ T are the current opening degree and the target opening degree of the first electronic expansion valve, respectively.
3. The control method for a multi-chamber electronic expansion valve of a refrigeration system according to claim 1, wherein the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber;
the controlling the opening value of the electronic expansion valve corresponding to the chamber to reduce the preset opening amount according to the first temperature difference, the second temperature difference, the heating output amount of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber includes:
when r1 is equal to 1 and the current opening degree of the first electronic expansion valve is greater than a preset first minimum opening degree, if Δ T11 is equal to or less than Δ T1 is equal to or less than Δ T12, T1HMV is equal to or greater than K × Δ T1HMV, T1_ PV > T _ PV _ EVAP, r2 is equal to 1, Δ T2 > - Δ T, T2_ SV < T _ PV _ EVAP, EV1_ T-EV2_ T is equal to or greater than EV _ T, P _ EVAP _1 is equal to or greater than P1, and EV1 EV is equal to or less than 1_ T +1, the opening degree of the first electronic expansion valve is controlled to be reduced by a preset opening amount every preset time; wherein r1 ═ 1 denotes that the first electromagnetic valve is in an on state, Δ T1 denotes a first temperature difference of the first compartment, Δ T11 and Δ T12 denote a preset minimum value and a preset maximum value of Δ T1, respectively, T1HMV and Δ T1HMV denote a heating output and a target reference value of the first compartment, respectively, K denotes a coefficient, T1_ PV denotes an actual temperature of the first compartment, T _ PV _ EVAP denotes a preset temperature difference control value, r2 ═ 1 denotes that the second electromagnetic valve is in an on state, Δ T2 denotes a first temperature difference of the second compartment, Δ T denotes a preset minimum value of Δ T2, T2_ SV denotes a preset target temperature of the second compartment, P _ EVAP _1 and P1 denote an evaporation pressure and a preset pressure of the first compartment, EV1 and EV1_ T denote a current opening and a current opening of the second compartment, and EV 56 _ SV is a preset target opening difference value, and EV 56 _ T _ 25 denotes a current opening of the second electronic expansion valve 2, respectively.
4. The control method for a multi-chamber electronic expansion valve of a refrigeration system according to claim 1, wherein the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber;
controlling the opening value of the electronic expansion valve corresponding to the chamber to increase a preset opening amount according to the first temperature difference, the second temperature difference, the heating output amount of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber, including:
when r1 is equal to 1 and the current opening degree of the first electronic expansion valve is smaller than a preset first maximum opening degree, if P _ EVAP _1 is less than P1, T1_ PV is less than or equal to T _ PV _ EVAP, T1_ PV-T1_ EVA is greater than T2 and EV1 is greater than or equal to EV1_ T-1, or if P _ EVAP _1 is less than P1, T1_ PV is greater than T _ PV _ EVAP and EV1 is greater than or equal to EV1_ T-1, controlling the opening degree of the first electronic expansion valve to be increased by a preset opening amount every preset time; wherein r1 ═ 1 indicates that the first electromagnetic valve is in an on state, T1_ PV is the actual temperature of the first compartment, T _ PV _ EVAP is a preset temperature difference control value, T1_ EVA is the evaporation temperature of the first compartment, T1_ PV-T1_ EVA is the second temperature difference of the first compartment, T2 is a preset second temperature difference value corresponding to the first temperature difference, P _ EVAP _1 and P1 are the evaporation pressure and the preset pressure of the first compartment, and 1 and EV1 EV _ T are the current opening degree and the target opening degree of the first electronic expansion valve, respectively.
5. The control method for a multi-chamber electronic expansion valve of a refrigeration system according to claim 1, wherein the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber;
the controlling the opening value of the electronic expansion valve corresponding to the chamber to reduce the preset opening amount according to the first temperature difference, the second temperature difference, the heating output amount of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber includes:
when r2 is equal to 1 and the current opening degree of the second electronic expansion valve is greater than a preset second minimum opening degree, if T2_ PV is less than or equal to T _ PV _ EVAP, T2_ PV-T2_ EVA is less than T1, P _ EVAP _2 is greater than or equal to P2, and EV2 is less than or equal to EV2_ T +1, controlling the opening degree of the second electronic expansion valve to be reduced by a preset opening amount every preset time; wherein r2 ═ 1 indicates that the second solenoid valve is in an on state, T2_ PV is the actual temperature of the second compartment, T2_ EVA is the evaporation temperature of the second compartment, T2_ PV-T2_ EVA is the second temperature difference of the second compartment, P _ evap _2 and P2 are the evaporation pressure and the preset pressure of the second compartment, respectively, and EV2 and EV2_ T are the current opening degree and the target opening degree of the second electronic expansion valve, respectively.
6. The control method for a multi-chamber electronic expansion valve of a refrigeration system according to claim 1, wherein the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber;
the controlling the opening value of the electronic expansion valve corresponding to the chamber to reduce the preset opening amount according to the first temperature difference, the second temperature difference, the heating output amount of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber includes:
when r2 is equal to 1 and the current opening degree of the second electronic expansion valve is greater than a preset second minimum opening degree, if Δ T21 is equal to or less than Δ T2 is equal to or less than Δ T22, T2HMV is equal to or greater than K × Δ T2HMV, T2_ PV > T _ PV _ EVAP, r1 is equal to 1, Δ T1 > - Δ T, T1_ SV < T _ PV _ EVAP, EV2_ T-EV1_ T is equal to or greater than EV _ T, P _ EVAP _2 is equal to or greater than P2, and EV2 EV is equal to or less than 1_ T +1, the opening degree of the second electronic expansion valve is controlled to be reduced by a preset opening amount every preset time; wherein r2 ═ 1 denotes that the second electromagnetic valve is in an on state, Δ T2 denotes a first temperature difference of the second compartment, Δ T11 and Δ T12 are respectively a preset minimum value and a preset maximum value of Δ T1, T1HMV and Δ T1HMV denote a heating output and a target reference value of the first compartment, K denotes a coefficient, T1_ PV denotes an actual temperature of the first compartment, T _ PV _ EVAP denotes a preset temperature difference control value, r1 ═ 1 denotes that the first electromagnetic valve is in an on state, Δ T1 denotes a first temperature difference of the first compartment, Δ T denotes a preset minimum value of Δ T1, T2_ SV denotes a preset target temperature of the second compartment, 2_ T denotes a target opening degree of the second electronic expansion valve, EV2 denotes a current opening degree of the second electronic expansion valve, EV1_ T denotes a target opening degree of the first compartment, EV 29 _ SV is a preset target opening degree of the first electronic expansion valve, EV _ ap _ P2 denotes a preset pressure difference of the second compartment, and EV2 are respectively preset pressure difference of the second compartment.
7. The control method for a multi-chamber electronic expansion valve of a refrigeration system according to claim 1, wherein the solenoid valve includes a first solenoid valve and a second solenoid valve, the electronic expansion valve includes a first electronic expansion valve and a second electronic expansion valve, and the chamber includes a first chamber and a second chamber;
controlling the opening value of the electronic expansion valve corresponding to the chamber to increase a preset opening amount according to the first temperature difference, the second temperature difference, the heating output amount of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber, including:
when r2 is equal to 1 and the current opening degree of the second electronic expansion valve is smaller than a preset second maximum opening degree, if P _ EVAP _2 is less than P2, T2_ PV is less than or equal to T _ PV _ EVAP, T2_ PV-T2_ EVA is greater than T2 and EV2 is greater than or equal to EV2_ T-1, or if P _ EVAP _2 is less than P2, T2_ PV is greater than T _ PV _ EVAP and EV2 is greater than or equal to EV2_ T-1, controlling the opening degree of the second electronic expansion valve to be increased by a preset opening amount every preset time; wherein r2 ═ 1 indicates that the second electromagnetic valve is in a conducting state, P _ EVAP _2 and P2 respectively indicate the evaporation pressure and the preset pressure of the second compartment, T2_ PV indicates the actual temperature of the second compartment, T _ PV _ EVAP indicates a preset temperature difference control value, T2_ PV indicates the actual temperature of the second compartment, T2_ EVA indicates the evaporation temperature of the second compartment, T2_ PV-T2_ EVA indicates the second temperature difference of the second compartment, T2 indicates a preset second temperature difference value corresponding to the first temperature difference, EV2 indicates the current opening degree of the second electronic expansion valve, and EV2_ T indicates the target opening degree of the second electronic expansion valve.
8. A control device for a multi-chamber electronic expansion valve of a refrigeration system, comprising:
the information acquisition module is used for acquiring the on-off state of each electromagnetic valve, the opening degree of each electronic expansion valve, the actual temperature of each compartment, the heating output quantity of a heater of each compartment, and the evaporation temperature and the evaporation pressure of an evaporator of each compartment in the refrigeration system; the electromagnetic valves and the electronic expansion valves are in one-to-one correspondence with the chambers, and each chamber is provided with a corresponding preset target temperature;
the temperature difference determining module is used for determining a first temperature difference between the actual temperature of each chamber and the corresponding preset target temperature according to the actual temperature of each chamber, and determining a second temperature difference between the actual temperature of each chamber and the corresponding evaporation temperature;
and the opening control module is used for controlling the opening value of the electronic expansion valve corresponding to the chamber to increase or decrease a preset opening value according to the first temperature difference, the second temperature difference, the heating output quantity of the chamber and the current opening value of the electronic expansion valve corresponding to the chamber when the electromagnetic valve corresponding to the chamber is in a conducting state.
9. A refrigeration system, comprising: the control device of the refrigeration system multi-chamber electronic expansion valve according to claim 8 is integrated in the controller; the electromagnetic valve and the electronic expansion valve are electrically connected with the controller, and the variable frequency compressor is connected with the evaporator of the corresponding compartment through the electromagnetic valve.
10. The refrigerant system as set forth in claim 9, wherein said compartment includes a temperature sensor, an evaporator and a heater, said temperature sensor, said evaporator and said heater all being electrically connected to said controller.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113154725A (en) * | 2021-05-27 | 2021-07-23 | 江苏拓米洛环境试验设备有限公司 | Control method of multi-chamber electronic expansion valve of refrigeration system and refrigeration system |
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