CN113154725A - Control method of multi-chamber electronic expansion valve of refrigeration system and refrigeration system - Google Patents
Control method of multi-chamber electronic expansion valve of refrigeration system and refrigeration system Download PDFInfo
- Publication number
- CN113154725A CN113154725A CN202110584787.0A CN202110584787A CN113154725A CN 113154725 A CN113154725 A CN 113154725A CN 202110584787 A CN202110584787 A CN 202110584787A CN 113154725 A CN113154725 A CN 113154725A
- Authority
- CN
- China
- Prior art keywords
- electronic expansion
- expansion valve
- chamber
- temperature
- opening degree
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention belongs to the technical field of test equipment, and discloses a control method of a multi-chamber electronic expansion valve of a refrigerating system and the refrigerating system. The method comprises the following steps: acquiring the opening degree of each electronic expansion valve in the refrigeration system at present and the actual temperature and the target temperature of each chamber; determining a chamber needing constant temperature and a chamber needing cooling, and determining the temperature difference between the actual temperature and the target temperature of the chamber needing constant temperature; judging whether the temperature difference between the actual temperature of the compartment needing constant temperature and the target temperature is within a preset temperature difference range, and if not, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the minimum opening degree; and if the temperature difference is within the preset temperature difference range, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the target opening degree. When the temperature of one part of the compartments needs to be constant and the other part of the compartments needs to be cooled simultaneously, the temperature fluctuation range of the compartments needing constant temperature can be ensured to be small, and each compartment can work normally.
Description
Technical Field
The invention relates to the technical field of test equipment, in particular to a control method of a multi-chamber electronic expansion valve of a refrigerating system and the refrigerating 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 refrigeration system, for a multi-compartment parallel cycle refrigeration system, the required temperatures of the compartments during operation may be the same or different, depending on the actual requirements of the compartments. In a multi-chamber parallel-cycle refrigeration system, the flow rate in a passage between a compressor and a chamber 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 chamber is not properly adjusted, the temperature fluctuation of the chamber and other chambers in an operating state is easily caused, and the normal operation of each chamber is influenced.
Therefore, reliable control of the electronic expansion valves of each compartment in the refrigeration system is required.
Disclosure of Invention
The invention aims to provide a control method of a multi-chamber electronic expansion valve of a refrigerating system, which can ensure that the temperature fluctuation range of a chamber requiring constant temperature is small and each chamber works normally when the temperature of one part of the chambers needs to be constant and the temperature of the other part of the chambers needs to be reduced simultaneously.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of controlling a multi-chamber electronic expansion valve of a refrigeration system, comprising:
acquiring the opening degree of each electronic expansion valve in the refrigeration system at present and the actual temperature and the target temperature of each chamber, wherein the electronic expansion valves correspond to the chambers one by one;
determining a chamber needing constant temperature and a chamber needing cooling, and determining the temperature difference between the actual temperature and the target temperature of the chamber needing constant temperature;
judging whether the temperature difference between the actual temperature of the compartment needing constant temperature and the target temperature is within a preset temperature difference range, and if not, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the minimum opening degree; and if the temperature difference is within the preset temperature difference range, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the target opening degree.
Preferably, the electronic expansion valve comprises a first electronic expansion valve and a second electronic expansion valve, the chambers comprise a first chamber and a second chamber, and when the first chamber is kept at a constant temperature and the second chamber is cooled, if T1_ PV-T1_ SV is not satisfied to be less than or equal to 0.1, the EV2 to Min _ EXV2 are controlled and maintained; if T1_ PV-T1_ SV is less than or equal to 0.1, controlling the EV2 to adjust to EV2_ T at each Tc time;
wherein T1_ PV is the actual temperature of the first compartment, T1_ SV is the target temperature of the first compartment, EV2 is the current opening degree of the second electronic expansion valve, Min _ EXV2 is the minimum value of the opening degree range of the second electronic expansion valve, Tc is the adjustment period of the refrigeration system, and EV2_ T is the target opening degree value of the second electronic expansion valve.
Preferably, the method further comprises the following steps:
and in the adjustment period time of the refrigeration system, after the current opening degree of the second electronic expansion valve is increased to the target opening degree value of the second electronic expansion valve, controlling the second electronic expansion valve to be maintained at the target opening degree value of the second electronic expansion valve.
Preferably, the method further comprises the following steps:
judging whether the elapsed time of Min _ EXV2 exceeds a preset time or not, and controlling the EV2 to adjust to the EV2_ T every Tc time if the elapsed time of Min _ EXV2 exceeds the preset time; if the preset time is not exceeded, whether T1_ PV-T1_ SV is less than or equal to 0.1 is continuously judged.
Preferably, the electronic expansion valve comprises a first electronic expansion valve and a second electronic expansion valve, the chambers comprise a first chamber and a second chamber, and when the second chamber is kept at a constant temperature and the first chamber is cooled, if T2_ PV-T2_ SV is not satisfied to be less than or equal to 0.1, the EV1 to Min _ EXV1 are controlled and maintained; if T2_ PV-T2_ SV is less than or equal to 0.1, controlling the EV1 to adjust to EV1_ T at each Tc time;
wherein T2_ PV is the actual temperature of the second compartment, T2_ SV is the target temperature of the second compartment, EV1 is the current opening degree of the first electronic expansion valve, Min _ EXV1 is the minimum value of the opening degree range of the first electronic expansion valve, Tc is the adjustment period of the refrigeration system, and EV1_ T is the target opening degree value of the first electronic expansion valve.
Preferably, the method further comprises the following steps:
and in the adjustment cycle time of the refrigeration system, after the current opening degree of the first electronic expansion valve is increased to the target opening degree value of the first electronic expansion valve, controlling the first electronic expansion valve to be maintained at the target opening degree value of the first electronic expansion valve.
Preferably, the method further comprises the following steps:
judging whether the elapsed time of Min _ EXV1 exceeds a preset time or not, and controlling the EV1 to adjust to the EV1_ T every Tc time if the elapsed time of Min _ EXV1 exceeds the preset time; if the preset time is not exceeded, whether T2_ PV-T2_ SV is less than or equal to 0.1 is continuously judged.
Another objective of the present invention is to provide a refrigeration system, which includes a compressor, a control device, at least two chambers, and at least two electronic expansion valves corresponding to the chambers one by one, wherein an evaporator is disposed in the chamber, the electronic expansion valves are electrically connected to the control device, and the compressor is connected to the evaporator through the electronic expansion valves.
Preferably, the control device comprises an obtaining module, a determining module and a control module, wherein the obtaining module is configured to obtain the opening degree of each electronic expansion valve and the actual temperature and the target temperature of each chamber, the determining module is configured to determine the chamber needing to be kept at a constant temperature and the chamber needing to be cooled, and determine the temperature difference between the actual temperature and the target temperature of the chamber needing to be kept at the constant temperature, the control module is configured to judge whether the temperature difference between the actual temperature and the target temperature of the chamber needing to be kept at the constant temperature is within a preset temperature difference range, and if the temperature difference is not within the preset temperature difference range, the electronic expansion valve corresponding to the chamber needing to be cooled is controlled to be adjusted from the current opening degree to the minimum opening degree; and if the temperature difference is within the preset temperature difference range, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the target opening degree.
Preferably, a temperature sensor is further provided in the compartment, and the temperature sensor is electrically connected to the control device.
The invention has the beneficial effects that:
according to the control method of the multi-chamber electronic expansion valve of the refrigeration system and the refrigeration system, the temperature difference between the actual temperature and the target temperature of the chamber needing constant temperature is determined according to the acquired actual temperature and the target temperature of each chamber; when the temperature difference between the actual temperature of the compartment needing constant temperature and the target temperature is not within the preset temperature difference range, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the minimum opening degree, and if the temperature difference is within the preset temperature difference range, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the target opening degree; the electronic expansion valves correspond to the chambers one by one, and the compressors are connected with the corresponding chambers through the electronic expansion valves. The control method of the multi-chamber electronic expansion valve of the refrigerating system and the refrigerating system provided by the invention ensure that the temperature fluctuation of the chamber needing constant temperature is not more than +/-0.5, and meanwhile, when the temperature fluctuation of the chamber needing constant temperature is not more than +/-0.5, the electronic expansion valve of the chamber needing cooling is adjusted to be gradually adjusted to a target opening degree in an adjustment period, the chamber needing cooling is ensured to be cooled smoothly, the dynamic adjustment of the temperature of the chamber is realized, and thus, the normal and stable work of each chamber is ensured.
Drawings
Fig. 1 is a flow chart of a control method of 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 flow chart of a control method of a multi-chamber electronic expansion valve of a refrigeration system provided by a third embodiment of the invention;
fig. 4 is a flowchart of a control method of a multi-chamber electronic expansion valve of a refrigeration system according to a fourth embodiment of the present invention;
fig. 5 is a flowchart of a control method of the multi-chamber electronic expansion valve of the refrigeration system according to the fifth 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.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
As shown in fig. 1, the present embodiment provides a method for controlling a multi-chamber electronic expansion valve of a refrigeration system, which specifically includes:
acquiring the opening degree of each electronic expansion valve in the refrigeration system at present and the actual temperature and the target temperature of each chamber; determining a chamber needing constant temperature and a chamber needing cooling, and determining the temperature difference between the actual temperature and the target temperature of the chamber needing constant temperature; judging whether the temperature difference between the actual temperature of the compartment needing constant temperature and the target temperature is within a preset temperature difference range, and if not, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the minimum opening degree; and if the temperature difference is within the preset temperature difference range, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the target opening degree. Wherein, the electronic expansion valves are arranged in one-to-one correspondence with the chambers. The temperature unit may be degrees celsius and the difference between the actual temperature of the compartment and the corresponding target temperature, e.g. -40 c, is taken as the temperature difference of the compartment. 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.
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 electronic expansion valve and a second electronic expansion valve. For example, when the first chamber is at a constant temperature and the second chamber is cooled, if the temperature difference between the actual temperature of the first chamber and the target temperature of the first chamber is not within a preset temperature difference range, the second electronic expansion valve is controlled to be adjusted to the minimum opening; if the temperature difference between the actual temperature of the first compartment and the target temperature of the first compartment is within the preset temperature difference range, the second electronic expansion valve is controlled to be adjusted to the target opening degree, temperature fluctuation (exceeding +/-0.5 ℃) of the first compartment is avoided, heat transfer temperature difference and system flow are guaranteed, and the pressure of the low-pressure end of the system is prevented from being changed into negative pressure.
The control method for the multi-chamber electronic expansion valve of the refrigeration system provided by this embodiment ensures that the temperature fluctuation of the chamber to be kept constant does not exceed ± 0.5, and meanwhile, when the temperature fluctuation of the chamber to be kept constant does not exceed ± 0.5, the electronic expansion valve of the chamber to be cooled is adjusted to a target opening gradually in an adjustment period, and the chamber to be cooled is ensured to be cooled smoothly, so that the dynamic adjustment of the temperature of the chamber is realized, the heat transfer temperature difference and the system flow are ensured, and the pressure at the low-pressure end of the system is prevented from being changed into negative pressure, thereby ensuring the normal and stable operation of each chamber.
Example two
As shown in fig. 2, this embodiment provides a method for controlling a multi-chamber electronic expansion valve of a refrigeration system, taking a refrigeration system including two chambers, namely a first chamber and a second chamber, as an example, where the first chamber and the second chamber correspond to a first electronic expansion valve and a second electronic expansion valve, and the method specifically includes:
acquiring the opening degree of each electronic expansion valve in the refrigeration system at present and the actual temperature and the target temperature of each chamber; determining a chamber needing constant temperature and a chamber needing cooling, and determining the temperature difference between the actual temperature and the target temperature of the chamber needing constant temperature; when the first compartment is at a constant temperature and the second compartment is cooled, if T1_ PV-T1_ SV is not satisfied to be less than or equal to 0.1, controlling EV2 to Min _ EXV2 and keeping; if T1_ PV-T1_ SV ≦ 0.1 is satisfied, the EV2 is controlled to adjust to EV2_ T per Tc time.
Wherein, the electronic expansion valves are arranged in one-to-one correspondence with the chambers. The temperature unit may be degrees celsius and the difference between the actual temperature of the compartment and the corresponding target temperature, e.g. -40 c, is taken as the temperature difference of the compartment. 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.
Wherein T1_ PV is the actual temperature of the first compartment, T1_ SV is the target temperature of the first compartment, EV2 is the current opening degree of the second electronic expansion valve, Min _ EXV2 is the minimum value of the opening degree range of the second electronic expansion valve, Tc is the adjustment period of the refrigeration system, and EV2_ T is the target opening degree value of the second electronic expansion valve.
The target temperature of the first compartment, the minimum value of the opening range of the second electronic expansion valve, the adjustment period of the refrigeration system, the target opening value of the second electronic expansion valve, and the like may be specifically set according to actual conditions, and are not limited herein.
Optionally, the control method of the multi-chamber electronic expansion valve of the refrigeration system provided in this embodiment further includes:
and controlling the second electronic expansion valve to maintain the target opening value of the second electronic expansion valve after the current opening of the second electronic expansion valve is increased to the target opening value of the second electronic expansion valve in the adjustment period time of the refrigeration system.
The control method for the multi-chamber electronic expansion valve of the refrigeration system provided by this embodiment ensures that the temperature fluctuation of the first chamber is not more than ± 0.5, and simultaneously, when the temperature fluctuation of the first chamber is not more than ± 0.5, the second electronic expansion valve is adjusted to a target opening degree gradually in an adjustment period, and the second chamber is ensured to be cooled smoothly, thereby realizing dynamic adjustment of the temperatures of the first chamber and the second chamber, ensuring the heat transfer temperature difference and the system flow, and avoiding the pressure at the low-pressure end of the system from becoming negative pressure, thereby ensuring that each chamber can work normally and stably.
EXAMPLE III
As shown in fig. 3, this embodiment provides a control method for a multi-chamber electronic expansion valve of a refrigeration system, which further includes, on the basis of the second embodiment: judging whether the elapsed time of Min _ EXV2 exceeds a preset time or not, and controlling the EV2 to adjust to the EV2_ T every Tc time if the elapsed time of Min _ EXV2 exceeds the preset time; if the preset time is not exceeded, whether T1_ PV-T1_ SV is less than or equal to 0.1 is continuously judged.
According to the control method of the multi-chamber electronic expansion valve of the refrigeration system, when the first chamber cannot maintain the constant temperature chamber due to system failure of the first chamber, the second chamber is cooled after a preset time, the problem that the second electronic expansion valve cannot be cooled in time due to the fact that the second electronic expansion valve is in the minimum value of the opening range for a long time due to system failure of the first chamber is avoided, and stable operation of the second chamber is guaranteed.
Example four
As shown in fig. 4, this embodiment provides a method for controlling a multi-chamber electronic expansion valve of a refrigeration system, taking a refrigeration system including two chambers, namely a first chamber and a second chamber, as an example, where the first chamber and the second chamber correspond to a first electronic expansion valve and a second electronic expansion valve, and the method specifically includes:
acquiring the opening degree of each electronic expansion valve in the refrigeration system at present and the actual temperature and the target temperature of each chamber; determining a chamber needing constant temperature and a chamber needing cooling, and determining the temperature difference between the actual temperature and the target temperature of the chamber needing constant temperature; when the second compartment is at a constant temperature and the first compartment is cooled down, if T2_ PV-T2_ SV is not satisfied to be less than or equal to 0.1, controlling EV1 to Min _ EXV1 and keeping; if T2_ PV-T2_ SV ≦ 0.1 is satisfied, the EV1 is controlled to adjust to EV1_ T per Tc time.
Wherein, the electronic expansion valves are arranged in one-to-one correspondence with the chambers. The temperature unit may be degrees celsius and the difference between the actual temperature of the compartment and the corresponding target temperature, e.g. -40 c, is taken as the temperature difference of the compartment. 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.
Wherein T2_ PV is the actual temperature of the second compartment, T2_ SV is the target temperature of the second compartment, EV1 is the current opening degree of the first electronic expansion valve, Min _ EXV1 is the minimum value of the opening degree range of the first electronic expansion valve, Tc is the adjustment period of the refrigeration system, and EV1_ T is the target opening degree value of the first electronic expansion valve.
The target temperature of the second compartment, the minimum value of the opening range of the first electronic expansion valve, the adjustment period of the refrigeration system, the target opening value of the first electronic expansion valve, and the like may be specifically set according to actual conditions, and are not limited herein.
Optionally, the control method of the multi-chamber electronic expansion valve of the refrigeration system provided in this embodiment further includes:
and controlling the first electronic expansion valve to maintain the target opening value of the first electronic expansion valve after the current opening of the first electronic expansion valve is increased to the target opening value of the first electronic expansion valve in the adjustment period time of the refrigeration system.
The control method for the multi-chamber electronic expansion valve of the refrigeration system provided by the embodiment ensures that the temperature fluctuation of the second chamber is not more than +/-0.5, and meanwhile, when the temperature fluctuation of the second chamber is not more than +/-0.5, the first electronic expansion valve is adjusted to gradually adjust to the target opening degree in the adjustment period, and the first chamber is ensured to be cooled smoothly, so that the dynamic adjustment of the temperature of the first chamber and the second chamber is realized, the heat transfer temperature difference and the system flow are ensured, and the pressure of the low-pressure end of the system is prevented from being changed into negative pressure, thereby ensuring the normal and stable work of each chamber.
EXAMPLE five
As shown in fig. 5, this embodiment provides a control method for a multi-chamber electronic expansion valve of a refrigeration system, which further includes, on the basis of the fourth embodiment: judging whether the elapsed time of Min _ EXV1 exceeds a preset time or not, and controlling the EV1 to adjust to the EV1_ T every Tc time if the elapsed time of Min _ EXV1 exceeds the preset time; if the preset time is not exceeded, whether T2_ PV-T2_ SV is less than or equal to 0.1 is continuously judged.
According to the control method of the multi-chamber electronic expansion valve of the refrigeration system, when the second chamber cannot maintain the constant temperature chamber due to system failure of the second chamber, the first chamber is cooled after a preset time, the problem that the first electronic expansion valve cannot be cooled in time due to the fact that the first electronic expansion valve is in the minimum opening range value for a long time due to system failure of the second chamber is avoided, and stable operation of the first chamber is guaranteed.
EXAMPLE six
The embodiment provides a refrigeration system, which comprises a compressor, a control device, at least two chambers and at least two electronic expansion valves in one-to-one correspondence with the chambers, wherein an evaporator is arranged in each chamber, the electronic expansion valves are electrically connected with the control device, and the compressor is connected with the evaporator through the electronic expansion valves.
Optionally, the control device comprises an obtaining module, a determining module and a control module, wherein the obtaining module is configured to obtain the opening degree of each electronic expansion valve and the actual temperature and the target temperature of each chamber; the determining module is configured to determine a chamber needing constant temperature and a chamber needing cooling, and determine the temperature difference between the actual temperature of the chamber needing constant temperature and the target temperature; the control module is configured to judge whether the temperature difference between the actual temperature and the target temperature of the compartment needing constant temperature is within a preset temperature difference range, and if the temperature difference is not within the preset temperature difference range, the control module controls the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the minimum opening degree; and if the temperature difference is within the preset temperature difference range, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the target opening degree.
Furthermore, a temperature sensor is also arranged in the chamber and is electrically connected with the control device. The temperature sensor is used for detecting the temperature in the compartment in real time and feeding back the detected temperature to the control device.
The refrigerating system provided by the embodiment ensures that the temperature fluctuation of the room needing constant temperature is not more than +/-0.5, and meanwhile, when the temperature fluctuation of the room needing constant temperature is not more than +/-0.5, the electronic expansion valve of the room needing cooling is adjusted to be gradually adjusted to the target opening degree in the adjustment period, the room needing cooling is ensured to be cooled smoothly, the dynamic adjustment of the temperature of the room is realized, and therefore the normal and stable work of each room is ensured.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method for controlling a multi-chamber electronic expansion valve of a refrigeration system, comprising:
acquiring the opening degree of each electronic expansion valve in the refrigeration system at present and the actual temperature and the target temperature of each chamber, wherein the electronic expansion valves correspond to the chambers one by one;
determining a chamber needing constant temperature and a chamber needing cooling, and determining the temperature difference between the actual temperature and the target temperature of the chamber needing constant temperature;
judging whether the temperature difference between the actual temperature of the compartment needing constant temperature and the target temperature is within a preset temperature difference range, and if not, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the minimum opening degree; and if the temperature difference is within the preset temperature difference range, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the target opening degree.
2. The control method of the multi-chamber electronic expansion valve of the refrigeration system according to claim 1, wherein the electronic expansion valve comprises a first electronic expansion valve and a second electronic expansion valve, the chambers comprise a first chamber and a second chamber, and when the first chamber is at a constant temperature and the second chamber is at a low temperature, if T1_ PV-T1_ SV is not satisfied to be less than or equal to 0.1, EV2 is controlled to Min _ EXV2 and maintained; if T1_ PV-T1_ SV is less than or equal to 0.1, controlling the EV2 to adjust to EV2_ T at each Tc time;
wherein T1_ PV is the actual temperature of the first compartment, T1_ SV is the target temperature of the first compartment, EV2 is the current opening degree of the second electronic expansion valve, Min _ EXV2 is the minimum value of the opening degree range of the second electronic expansion valve, Tc is the adjustment period of the refrigeration system, and EV2_ T is the target opening degree value of the second electronic expansion valve.
3. The method for controlling a multi-chamber electronic expansion valve of a refrigeration system of claim 2, further comprising:
and in the adjustment period time of the refrigeration system, after the current opening degree of the second electronic expansion valve is increased to the target opening degree value of the second electronic expansion valve, controlling the second electronic expansion valve to be maintained at the target opening degree value of the second electronic expansion valve.
4. The method for controlling a multi-chamber electronic expansion valve of a refrigeration system of claim 2, further comprising:
judging whether the elapsed time of Min _ EXV2 exceeds a preset time or not, and controlling the EV2 to adjust to the EV2_ T every Tc time if the elapsed time of Min _ EXV2 exceeds the preset time; if the preset time is not exceeded, whether T1_ PV-T1_ SV is less than or equal to 0.1 is continuously judged.
5. The control method of the multi-chamber electronic expansion valve of the refrigeration system according to claim 1, wherein the electronic expansion valve comprises a first electronic expansion valve and a second electronic expansion valve, the chambers comprise a first chamber and a second chamber, and when the second chamber is at a constant temperature and the first chamber is cooled, if T2_ PV-T2_ SV is not satisfied to be less than or equal to 0.1, EV1 is controlled to Min _ EXV1 and maintained; if T2_ PV-T2_ SV is less than or equal to 0.1, controlling the EV1 to adjust to EV1_ T at each Tc time;
wherein T2_ PV is the actual temperature of the second compartment, T2_ SV is the target temperature of the second compartment, EV1 is the current opening degree of the first electronic expansion valve, Min _ EXV1 is the minimum value of the opening degree range of the first electronic expansion valve, Tc is the adjustment period of the refrigeration system, and EV1_ T is the target opening degree value of the first electronic expansion valve.
6. The method for controlling a multi-chamber electronic expansion valve of a refrigeration system of claim 5, further comprising:
and in the adjustment cycle time of the refrigeration system, after the current opening degree of the first electronic expansion valve is increased to the target opening degree value of the first electronic expansion valve, controlling the first electronic expansion valve to be maintained at the target opening degree value of the first electronic expansion valve.
7. The method for controlling a multi-chamber electronic expansion valve of a refrigeration system of claim 5, further comprising:
judging whether the elapsed time of Min _ EXV1 exceeds a preset time or not, and controlling the EV1 to adjust to the EV1_ T every Tc time if the elapsed time of Min _ EXV1 exceeds the preset time; if the preset time is not exceeded, whether T2_ PV-T2_ SV is less than or equal to 0.1 is continuously judged.
8. A refrigerating system is characterized by comprising a compressor, a control device, at least two chambers and at least two electronic expansion valves in one-to-one correspondence with the chambers, evaporators are arranged in the chambers, the electronic expansion valves are electrically connected with the control device, and the compressor is connected with the evaporators through the electronic expansion valves.
9. The refrigeration system according to claim 8, wherein the control device comprises an obtaining module, a determining module and a control module, the obtaining module is configured to obtain the opening degree of each electronic expansion valve and the actual temperature and the target temperature of each chamber, the determining module is configured to determine the chamber needing to be thermostated and the chamber needing to be cooled, and determine the temperature difference between the actual temperature and the target temperature of the chamber needing to be thermostated, the control module is configured to judge whether the temperature difference between the actual temperature and the target temperature of the chamber needing to be thermostated is within a preset temperature difference range, and if the temperature difference is not within the preset temperature difference range, the electronic expansion valve corresponding to the chamber needing to be cooled is controlled to be adjusted from the current opening degree to the minimum opening degree; and if the temperature difference is within the preset temperature difference range, controlling the electronic expansion valve corresponding to the compartment needing cooling to be adjusted from the current opening degree to the target opening degree.
10. A refrigeration system as claimed in claim 8 or 9, wherein a temperature sensor is also provided in the compartment, the temperature sensor being electrically connected to the control means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110584787.0A CN113154725A (en) | 2021-05-27 | 2021-05-27 | Control method of multi-chamber electronic expansion valve of refrigeration system and refrigeration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110584787.0A CN113154725A (en) | 2021-05-27 | 2021-05-27 | Control method of multi-chamber electronic expansion valve of refrigeration system and refrigeration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113154725A true CN113154725A (en) | 2021-07-23 |
Family
ID=76877883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110584787.0A Pending CN113154725A (en) | 2021-05-27 | 2021-05-27 | Control method of multi-chamber electronic expansion valve of refrigeration system and refrigeration system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113154725A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218114A (en) * | 2021-06-04 | 2021-08-06 | 江苏拓米洛环境试验设备有限公司 | Control method of electronic expansion valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766535A (en) * | 2016-12-29 | 2017-05-31 | 青岛海尔股份有限公司 | A kind of control method of refrigerator |
| CN111351306A (en) * | 2020-03-10 | 2020-06-30 | 合肥美的电冰箱有限公司 | Refrigeration equipment, control method and control device thereof and storage medium |
| CN111854284A (en) * | 2020-07-22 | 2020-10-30 | 合肥华凌股份有限公司 | Refrigeration device and control method thereof |
| CN112272622A (en) * | 2018-06-08 | 2021-01-26 | 株式会社电装 | Refrigeration cycle device for vehicle |
| CN112665254A (en) * | 2020-12-28 | 2021-04-16 | 江苏拓米洛环境试验设备有限公司 | Control method and device for multi-chamber electronic expansion valve of refrigeration system and refrigeration system |
-
2021
- 2021-05-27 CN CN202110584787.0A patent/CN113154725A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766535A (en) * | 2016-12-29 | 2017-05-31 | 青岛海尔股份有限公司 | A kind of control method of refrigerator |
| CN112272622A (en) * | 2018-06-08 | 2021-01-26 | 株式会社电装 | Refrigeration cycle device for vehicle |
| CN111351306A (en) * | 2020-03-10 | 2020-06-30 | 合肥美的电冰箱有限公司 | Refrigeration equipment, control method and control device thereof and storage medium |
| CN111854284A (en) * | 2020-07-22 | 2020-10-30 | 合肥华凌股份有限公司 | Refrigeration device and control method thereof |
| CN112665254A (en) * | 2020-12-28 | 2021-04-16 | 江苏拓米洛环境试验设备有限公司 | Control method and device for multi-chamber electronic expansion valve of refrigeration system and refrigeration system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218114A (en) * | 2021-06-04 | 2021-08-06 | 江苏拓米洛环境试验设备有限公司 | Control method of electronic expansion valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111692736B (en) | Control method of electronic expansion valve and air conditioning system | |
| CN107860103B (en) | Control method and device of multi-split system and system with control device | |
| EP1624262B1 (en) | Refrigerator | |
| CN108759029B (en) | Air conditioning system, control method of air conditioning system and air conditioner | |
| US10801767B2 (en) | Refrigeration cycle apparatus | |
| CN115355637B (en) | Control method and device for multi-chamber electronic expansion valve of refrigeration system and refrigeration system | |
| CN113063216A (en) | Rotating speed control method of air conditioner external fan | |
| CN113701411B (en) | Refrigerant cooling system and method of frequency converter | |
| CN112965546A (en) | Temperature control system and temperature control method for semiconductor temperature control | |
| CN111486508A (en) | Adaptive refrigerant quantity multi-split system and control method thereof | |
| CN113154725A (en) | Control method of multi-chamber electronic expansion valve of refrigeration system and refrigeration system | |
| CN112611140A (en) | Temperature control device and method | |
| CN110388772B (en) | Control method and device for electronic expansion valve of heat pump air conditioner and heat pump air conditioner | |
| CN113915901B (en) | Refrigerator and constant-temperature refrigeration method thereof | |
| CN114165845A (en) | Multi-split air conditioner | |
| KR20130026685A (en) | Air conditioner and control method thereof | |
| CN116085934A (en) | Air conditioning unit control method and device and air conditioning unit | |
| KR20100088426A (en) | Control method of air conditioner for vehicle | |
| KR20150074247A (en) | Method for controlling inverter compressor of refrigerator | |
| EP3619480B1 (en) | A method for controlling suction pressure based on a most loaded cooling entity | |
| CN215864170U (en) | Electronic expansion valve control system | |
| KR100765726B1 (en) | Manual a/c control compressor method for vehicle | |
| CN115325751B (en) | Control method for precisely controlling temperature in multiple temperature areas, refrigerating system and refrigerator | |
| CN115717805B (en) | Control method and device of refrigerating system and refrigerating system | |
| CN113701406A (en) | Electronic expansion valve control system and control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210723 |