CN112682988B - Control method and device for refrigerant flow and refrigeration equipment - Google Patents
Control method and device for refrigerant flow and refrigeration equipment Download PDFInfo
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- CN112682988B CN112682988B CN202011583648.8A CN202011583648A CN112682988B CN 112682988 B CN112682988 B CN 112682988B CN 202011583648 A CN202011583648 A CN 202011583648A CN 112682988 B CN112682988 B CN 112682988B
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 102
- 238000005057 refrigeration Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000012937 correction Methods 0.000 claims abstract description 74
- 239000012530 fluid Substances 0.000 claims description 55
- 230000005494 condensation Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
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- 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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2515—Flow valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a control method of refrigerant flow, a device thereof and refrigeration equipment, wherein the control method comprises the following steps: acquiring the actual temperature of each chamber, the preset temperature of each chamber, the temperature of the environment where the condenser is located and a correction coefficient; determining target opening values of the throttling devices associated with the chambers in a one-to-one correspondence mode according to preset temperatures of the chambers, actual temperatures of the chambers, the temperature of the environment where the condenser is located and correction coefficients; and controlling the valve body of each throttling device to operate to the target opening according to the target opening value of each throttling device so as to control the flow rate of the refrigerant flowing into each chamber in a one-to-one correspondence mode through each throttling device associated with each chamber. The invention realizes the intelligent control of the flow of the refrigerant of a plurality of compartments, enables the flow of the refrigerant of each compartment to be matched with the actual load requirement of the refrigerating system, and avoids the problems of poor refrigerating effect and even damage to the refrigerating system caused by overlarge or undersize flow of the refrigerant.
Description
Technical Field
The embodiment of the invention relates to a refrigeration control technology of environmental test equipment, in particular to a method and a device for controlling the flow of refrigerant and refrigeration equipment.
Background
The refrigerant is a working medium for completing thermodynamic cycle of refrigerating equipment, absorbs heat of a cooled object at a low temperature, and then transfers the heat to cooling water or air at a higher temperature.
At present, for environment test equipment applied to battery testing, accurate adjustment and control of refrigerant flow of a plurality of chambers according to refrigeration requirements of each chamber cannot be realized, so that the refrigerant flow cannot be matched with actual load requirements of a refrigeration system, the refrigeration effect of the refrigeration system is poor, and the problems of damage to the refrigeration equipment, resource waste and the like are caused.
Disclosure of Invention
The invention provides a method and a device for controlling the flow of a refrigerant and refrigeration equipment, which can accurately control the flow of the refrigerant of each chamber and enable the flow of the refrigerant of each chamber to be matched with the actual load requirement of a refrigeration system.
In a first aspect, an embodiment of the present invention provides a method for controlling a refrigerant flow, including:
acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and a correction coefficient;
determining a target opening value of each throttling device associated with each compartment in a one-to-one correspondence manner according to a preset temperature of each compartment, an actual temperature of each compartment, a fluid inlet temperature of an environment where the condenser is located and the correction coefficient;
and controlling the valve body of each throttling device to operate to a target opening degree according to the target opening degree value of each throttling device so as to control the flow rate of the refrigerant flowing into each chamber in a one-to-one correspondence mode through each throttling device associated with each chamber.
Optionally, before the obtaining the actual temperature of each compartment, the preset temperature of each compartment, the fluid inlet temperature of the environment where the condenser is located, and the correction coefficient, the method further includes:
acquiring the conduction state of each electromagnetic valve associated with each chamber;
determining conduction state values of the electromagnetic valves associated with the chambers in a one-to-one correspondence manner according to the conduction states of the electromagnetic valves; when the electromagnetic valve is in an open state, the conduction state value of the electromagnetic valve is 1; when the electromagnetic valve is in a closed state, the conducting state value of the electromagnetic valve is 0;
determining whether each compartment has a refrigeration demand according to the conduction state value of the electromagnetic valve;
and if so, executing the step of acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and the correction coefficient.
Optionally, before controlling the valve body of each of the throttling devices to move to the target opening according to the target opening of each of the throttling devices, the method further includes:
determining a product of a conduction state value of the solenoid valve associated with the chamber and a target opening value of the throttling device associated with the chamber as a target opening value of the throttling device associated with the chamber.
Optionally, determining the target opening degree of each throttling device associated with each compartment in a one-to-one correspondence manner according to the preset temperature of each compartment, the actual temperature of each compartment, the fluid inlet temperature of the environment in which the condenser is located, and the correction coefficient, includes:
calculating the temperature difference between the preset temperature of the chamber and the actual temperature of the chamber;
determining the target opening value d1 according to the temperature difference, the preset temperature of each compartment, the fluid inlet temperature of the environment where the condenser is located and a correction coefficient according to the following formula:
d1＝r1*int{60-Et*T1/5+Cr*Tr/5+e1+Max[2*(ΔT1-1),0]}
wherein r1 is the on state value of the solenoid valve associated with the compartment; et is a preset temperature correction coefficient of the chamber; cr is a fluid inlet temperature correction coefficient of the environment where the condenser is located; e1 is a target opening dynamic correction value of the throttling device related to the compartment; t1 is the preset temperature of the compartment, Tr is the fluid inlet temperature of the environment in which the condenser is located, Δ T1 is the temperature difference between the preset temperature and the actual temperature of the compartment.
Optionally, the obtaining of the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located, and the correction coefficient includes:
and acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is positioned and the correction coefficient at preset periods.
Optionally, the correction parameter includes an ambient temperature correction coefficient, a preset temperature correction coefficient, and a dynamic correction value of the design opening of the throttling device.
In a second aspect, an embodiment of the present invention further provides a control device for a refrigerant flow, the control device including:
the information acquisition module is used for acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and a correction coefficient;
the target opening degree determining module is used for determining a target opening degree value of each throttling device associated with each compartment in a one-to-one correspondence mode according to the preset temperature of each compartment, the actual temperature of each compartment, the fluid inlet temperature of the environment where the condenser is located and the correction coefficient;
and the control module is used for controlling the valve body of each throttling device to operate to a target opening degree according to the target opening degree value of each throttling device so as to control the flow of the refrigerant flowing into each chamber in a one-to-one correspondence mode through each throttling device associated with each chamber.
Optionally, the information obtaining module further includes:
the electromagnetic valve state acquisition module is used for acquiring the conduction state of each electromagnetic valve associated with each chamber;
the state value determining module is used for determining the conduction state values of the electromagnetic valves related to the chambers in a one-to-one correspondence mode according to the conduction states of the electromagnetic valves; when the electromagnetic valve is in an open state, the conduction state value of the electromagnetic valve is 1; when the electromagnetic valve is in a closed state, the conducting state value of the electromagnetic valve is 0;
the refrigeration demand determining module is used for determining whether each compartment has a refrigeration demand according to the conduction state value of the electromagnetic valve; and if so, executing the step of acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and the correction coefficient.
Optionally, the information obtaining module is specifically configured to:
and acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is positioned and the correction coefficient at preset periods.
In a third aspect, an embodiment of the present invention further provides a refrigeration apparatus, including: the system comprises at least one compartment, at least one throttling device, at least one electromagnetic valve, at least one first temperature sensor, a second temperature sensor, a condenser, a compressor and a controller;
the first temperature sensors are arranged in the compartments in a one-to-one correspondence manner; the first temperature sensor is used for acquiring the actual temperature of the compartment;
the second temperature sensor is used for acquiring the fluid inlet temperature of the environment where the condenser is located;
the compressor is used for compressing the refrigerant gas and transmitting the compressed refrigerant gas to the condenser for condensation through a gas pipeline, so that the condensed refrigerant is transmitted to the positions of the chambers through the refrigerant pipelines corresponding to the chambers one by one;
the throttling device and the electromagnetic valve are arranged in each refrigerant pipeline in a one-to-one correspondence mode so as to control the refrigerant flow in each refrigerant pipeline;
the controller is used for executing the control method of the refrigerant flow.
According to the invention, the target opening degree value of the throttling device connected with each chamber is determined through the real-time acquired actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and the correction coefficient, and each throttling device is controlled to operate to the target opening degree according to the target opening degree value, so that the accurate control of the refrigerant flow of each chamber is realized, the refrigerant flow of each chamber is matched with the actual load requirement of a refrigeration system, and the problem that the refrigeration effect is poor even the refrigeration system is damaged due to the over-large or over-small refrigerant flow is avoided, thereby accurately controlling the temperature in each chamber and being beneficial to saving power consumption.
Drawings
FIG. 1 is a flow chart of a method for controlling refrigerant flow according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for controlling refrigerant flow according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a device for controlling the flow rate of refrigerant according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a refrigeration apparatus according to an 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.
The embodiment of the invention provides a control method of refrigerant flow, which can realize intelligent control of the refrigerant flow of a plurality of compartments, the control method can be executed by adopting the control device of the refrigerant flow provided by the embodiment of the invention, the control device is realized by software and/or hardware, and the control device of the refrigerant flow can be integrated in the refrigeration equipment provided by the embodiment of the invention. The refrigeration equipment can comprise a compressor, a condenser, a plurality of chambers and a plurality of throttling devices which are arranged in one-to-one correspondence with the chambers; the compressor can compress refrigerant gas, the compressed refrigerant gas is converted into liquid refrigerant after being condensed by the condenser, and the refrigerant is transmitted to each chamber through corresponding pipelines so as to control the temperature in each chamber; and the throttle devices can control the flow rate of the refrigerant flowing into each chamber in a one-to-one correspondence. For convenience of description, the operation principle of the refrigeration equipment is described above by taking an air cooling refrigeration mode as an example, and it should be noted that the method for controlling the flow rate of the refrigerant provided by the embodiment of the present invention is also applicable to a water cooling refrigeration mode.
Fig. 1 is a flowchart of a method for controlling a refrigerant flow according to an embodiment of the present invention, and as shown in fig. 1, the method for controlling a refrigerant flow includes:
s110, acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and a correction coefficient;
specifically, by arranging corresponding temperature sensors in each compartment of the refrigeration equipment, the actual temperature of each compartment can be acquired in a one-to-one correspondence manner through the temperature sensors; meanwhile, a temperature sensor can be arranged in the environment of the condenser to acquire the fluid inlet temperature of the environment of the condenser. The preset temperature of each chamber is set by a user to generate; the correction coefficients may include an ambient temperature correction coefficient, a preset temperature correction coefficient, a dynamic correction value of the design opening of the throttle device, and the like, which may be summarized from experimental data and experience for improving the stability and accuracy of the system. The fluid may comprise a liquid or a gas, among others.
For example, after the user sets the preset temperature, the actual temperature of each chamber and the fluid inlet temperature of the environment where the condenser is located may be obtained in a preset period, so that the actual temperature of each chamber and the fluid inlet temperature of the environment where the condenser is located may be updated in real time; meanwhile, the preset temperature and the correction coefficient of each chamber can be obtained in a preset period, so that the real-time updating of the preset temperature and the correction coefficient of each chamber can be realized. The preset period may be updating the acquired data every 5 ms.
And S120, determining the target opening value of each throttling device associated with each chamber in a one-to-one correspondence mode according to the preset temperature of each chamber, the actual temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and the correction coefficient.
Specifically, the respective throttling devices associated with the respective chambers are throttling devices capable of controlling the flow rates of the refrigerant flowing into the respective chambers in a one-to-one correspondence. Thus, after the preset temperature of each compartment, the actual temperature of each compartment, the fluid inlet temperature of the environment where the condenser is located, and the correction coefficient are obtained, the temperature difference Δ T1 between the preset temperature of each compartment and the actual temperature can be calculated according to the preset temperature T1 of each compartment and the actual temperature of each compartment, and then the target opening value d1 of the throttling device associated with each compartment is calculated in a one-to-one correspondence manner by using the following formula according to the temperature difference Δ T1 corresponding to each compartment, the preset temperature T1 of each compartment, and the fluid inlet temperature Tr of the environment where the condenser is located:
d1＝int{60-Et*T1/5+Cr*Tr/5+e1+Max[2*(ΔT1-1),0]}
et is a preset temperature correction coefficient of the compartment; cr is a fluid inlet temperature correction coefficient of the environment where the condenser is located; e1 is a target opening dynamic correction value of the chamber-related throttling device, int is a rounding function, and Max is a maximum function. Wherein the throttling device may be an electronic expansion valve.
For example, when the acquired data is updated at the preset period, the updated data is used to recalculate the target opening value of the throttling device corresponding to each chamber, so that the target opening value of the throttling device associated with each chamber can be updated at the preset period.
And S130, controlling the valve body of each throttling device to move to the target opening according to the target opening value of each throttling device, so as to control the flow rate of the refrigerant flowing into each chamber in a one-to-one correspondence mode through each throttling device associated with each chamber.
Specifically, after the target opening degree value of each throttling device associated with each chamber is determined, the valve body of each throttling device can be controlled to operate to the target opening degree in a one-to-one correspondence manner according to the determined target opening degree value of each throttling device, so that the flow rate of the refrigerant flowing through each throttling device can be controlled, and the temperature of each chamber can be accurately controlled to be at the preset temperature. When the target opening degree value of each throttling device is updated according to the preset period, the running position of the valve body of each throttling device can be controlled in real time according to the target opening degree value of each throttling device.
According to the control method of the refrigerant flow, the target opening value of the throttling device connected with each chamber is determined through the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and the correction coefficient which are obtained in real time, each throttling device is controlled to operate to the target opening according to the target opening value, the intelligent control of the refrigerant flow of a plurality of chambers is achieved, the refrigerant flow of each chamber is matched with the actual load requirement of a refrigeration system, the problem that the refrigeration effect is poor and even the refrigeration system is damaged due to the fact that the refrigerant flow is too large or too small is solved, the temperature in each chamber can be accurately controlled, and power consumption is saved. Meanwhile, the embodiment of the invention acquires the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located, the correction coefficient and other information in a preset period, periodically updates the target opening of each throttling device, and controls the opening of each throttling device again according to the updated target opening, thereby ensuring the real-time performance and realizing the accurate control of the flow of the refrigerant flowing into the corresponding chamber by controlling the opening of the throttling device.
Optionally, before obtaining the actual temperature of each compartment, the preset temperature of each compartment, the fluid inlet temperature of the environment where the condenser is located, and the correction coefficient, it should be determined whether each compartment has a refrigeration requirement, fig. 2 is a flowchart of another method for controlling the refrigerant flow according to an embodiment of the present invention, and as shown in fig. 2, the method for controlling the refrigerant flow includes:
s210, acquiring the conduction state of each electromagnetic valve associated with each chamber;
s220, determining the conduction state values of the electromagnetic valves related to the chambers in a one-to-one correspondence mode according to the conduction states of the electromagnetic valves;
s230, determining whether each chamber has a refrigeration demand according to the conduction state value of the electromagnetic valve; if yes, go to S240.
Specifically, the refrigerant transmission pipeline of each chamber in the refrigeration equipment is provided with an electromagnetic valve for switching on or off the refrigerant pipeline of each chamber. Normally, the solenoid valves provided on the refrigerant transmission pipelines of the compartments are opened only when there is a refrigeration demand, and the solenoid valves provided on the refrigerant transmission pipelines of the compartments are closed when there is no refrigeration demand. Therefore, the conducting state of the electromagnetic valve associated with each chamber can be obtained in real time, and the conducting state value of each battery valve is determined in a one-to-one correspondence mode according to the conducting state of each electromagnetic valve. When the electromagnetic valve is in an open state, the conducting state value r1 of the electromagnetic valve is 1; when the solenoid valve is in the closed state, the on-state value r1 of the solenoid valve is 0. Therefore, the embodiment of the invention quantizes the conduction state of the electromagnetic valve into the conduction state value easy to recognize, judges whether the chambers correspondingly connected with the electromagnetic valve have refrigeration requirements according to the conduction state value easy to recognize, so as to control the flow of the refrigerant of the chambers with the refrigeration requirements, and does not control the refrigeration of the chambers without the refrigeration requirements.
S240, acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and a correction coefficient.
S250, calculating a temperature difference delta T1 between the preset temperature and the actual temperature of each compartment according to the preset temperature T1 of each compartment and the actual temperature of each compartment;
s260, determining target opening values d1 of the throttling devices associated with the compartments in a one-to-one correspondence mode according to the temperature difference delta T1, the preset temperature T1 of the compartments, the fluid inlet temperature Tr of the environment where the condenser is located and the correction coefficient, wherein the specific formula is as follows:
d1＝r1*int{60-Et*T1/5+Cr*Tr/5+e1+Max[2*(ΔT1-1),0]}
wherein r1 is the conduction state value of the solenoid valve associated with the chamber, and Et is the preset temperature correction coefficient of the chamber; cr is a fluid inlet temperature correction coefficient of the environment where the condenser is located; e1 is a target opening dynamic correction value of the chamber-related throttling device, int is a rounding function, and Max is a maximum function.
Specifically, the product of the on-state value r1 of the solenoid valve associated with each chamber and the rounded target opening value is determined as the target opening value of the throttling device associated with the chamber, and when the on-state value r1 of the solenoid valve is 0, the target opening value of the throttling device is 0, that is, the throttling device is in a closed state, and the refrigerant cannot be delivered into the chamber, that is, the refrigerant flow rate control of the chamber is not required; when the on-state value r1 of the electromagnetic valve is 1, the target opening value d1 of the throttling device can be correspondingly calculated, the opening of the throttling device is controlled according to the target opening value, and in addition, correction parameters and numerical parameters are set to improve the stability and the accuracy of the system.
And S270, controlling the valve body of each throttling device to move to the target opening degree according to the target opening degree value of each throttling device.
According to the embodiment of the invention, the target opening degree of each throttling device corresponding to each chamber is determined according to the preset temperature and the actual temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located, the correction parameter and other information in combination with the conduction state of the electromagnetic valve, so that the accurate control of the refrigerant flow of a plurality of chambers is realized, and the refrigerant flow of each chamber is matched with the actual load requirement of the refrigeration system.
The embodiment of the invention also provides a control device of the refrigerant flow, which can realize the intelligent control of the refrigerant flow of the plurality of compartments, the control device of the refrigerant flow can execute the control method of the refrigerant flow provided by the embodiment of the invention, the control device is realized by software and/or hardware, and the control device of the refrigerant flow can be integrated in the refrigeration equipment provided by the embodiment of the invention. Fig. 3 is a schematic structural diagram of a control device for refrigerant flow according to an embodiment of the present invention, and as shown in fig. 3, the control device includes: the information acquisition module 310 is configured to acquire an actual temperature of each chamber, a preset temperature of each chamber, a fluid inlet temperature of an environment where the condenser is located, and a correction coefficient; the target opening degree determining module 320 is configured to determine target opening degree values of the throttling devices associated with the chambers in a one-to-one correspondence manner according to preset temperatures of the chambers, actual temperatures of the chambers, fluid inlet temperatures of environments where the condensers are located, and correction coefficients; and the control module 330 is configured to control the valve body of each throttling device to operate to a target opening degree according to the target opening degree value of each throttling device, so as to control the flow rate of the refrigerant flowing into each chamber in a one-to-one correspondence manner through each throttling device associated with each chamber.
Optionally, the information obtaining module 310 further includes: the electromagnetic valve state acquisition module is used for acquiring the conduction state of each electromagnetic valve associated with each chamber; the state value determining module is used for determining the conduction state values of the electromagnetic valves related to the chambers in a one-to-one correspondence mode according to the conduction states of the electromagnetic valves; when the electromagnetic valve is in an open state, the conduction state value of the electromagnetic valve is 1; when the electromagnetic valve is in a closed state, the conducting state value of the electromagnetic valve is 0; the refrigeration demand determining module is used for determining whether each chamber has a refrigeration demand according to the conduction state value of the electromagnetic valve; and if so, executing the step of acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and the correction coefficient.
Optionally, the information obtaining module is specifically configured to: and acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is positioned and the correction coefficient at preset periods.
Optionally, the target opening determining module 320 further includes: the temperature difference calculation unit is used for calculating the temperature difference between the preset temperature of the chamber and the actual temperature of the chamber; a target opening value determining unit, configured to determine a target opening value d1 according to the following formula according to the temperature difference, the preset temperatures of the compartments, the fluid inlet temperature of the environment in which the condenser is located, and the correction coefficient:
d1＝r1*int{60-Et*T1/5+Cr*Tr/5+e1+Max[2*(ΔT1-1),0]}
wherein r1 is the conduction state value of the solenoid valve associated with the compartment; et is a preset temperature correction coefficient of the compartment; cr is a fluid inlet temperature correction coefficient of the environment where the condenser is located; e1 is a target opening dynamic correction value of the chamber-related throttle device; t1 is the preset temperature of the compartment, Tr is the fluid inlet temperature of the environment in which the condenser is located, Δ T1 is the temperature difference between the preset temperature and the actual temperature of the compartment.
It should be noted that, in the embodiment of the control device for refrigerant flow rate, the modules and units included in the embodiment are merely divided according to the function logic, but are not limited to the above division, as long as the corresponding functions can be realized; in addition, specific names of the functional modules and units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
The control device for the refrigerant flow provided by the embodiment of the invention can execute the control method for the refrigerant flow provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects for executing the control method for the refrigerant flow. Technical details that are not described in detail in the above embodiments may be referred to a method of controlling a refrigerant flow rate provided in any embodiment of the present invention.
An embodiment of the present invention further provides a refrigeration apparatus, and fig. 4 is a schematic structural diagram of a refrigeration apparatus provided in an embodiment of the present invention, and as shown in fig. 4, the refrigeration apparatus includes: at least one compartment 410, at least one throttling device 420, at least one solenoid valve 430, at least one first temperature sensor 440, a second temperature sensor 450, a condenser 460, a compressor 470, and a controller 480; the first temperature sensors 440 are correspondingly arranged in the chambers 410; the first temperature sensor 440 is used to obtain the actual temperature of the compartment 410; the second temperature sensor 450 is used for acquiring the temperature of the environment where the condenser 460 is located; the compressor 470 is configured to compress a refrigerant gas and transmit the compressed refrigerant gas to the condenser 460 through a gas pipeline for condensation, so that the condensed refrigerant is transmitted to the positions of the compartments 410 through refrigerant pipelines corresponding to the compartments 410 one by one; the throttle devices 420 and the solenoid valves 430 are disposed in the respective refrigerant lines in a one-to-one correspondence to control the refrigerant flow rate in the respective refrigerant lines; the controller 480 is configured to perform a method for controlling a flow rate of the refrigerant according to an embodiment of the present invention.
Specifically, the signal input end of the controller 480 is electrically connected to the first temperature sensor, the second temperature sensor, and each electromagnetic valve, and is configured to collect an actual temperature of each compartment, a fluid inlet temperature of an environment in which the condenser is located, and a conduction state of each electromagnetic valve, the signal input end of the controller 480 is electrically connected to the control end of each throttling device, and is configured to control an opening degree of the throttling device, and the controller 480 includes the control device for the refrigerant flow, and is configured to execute the control method for the refrigerant flow.
The refrigeration equipment provided by the embodiment of the invention can execute the control method of the refrigerant flow provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the control method of the refrigerant flow. Technical details that are not described in detail in the above embodiments may be referred to a method of controlling a refrigerant flow rate provided in any embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A method for controlling a flow rate of a refrigerant, comprising:
acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and a correction coefficient;
determining the target opening value of each throttling device associated with each compartment in a one-to-one correspondence according to the preset temperature of each compartment, the actual temperature of each compartment, the fluid inlet temperature of the environment in which the condenser is located, and the correction coefficient comprises: determining target opening values d1 of the throttling devices associated with the compartments in a one-to-one correspondence mode according to temperature differences delta T1 between preset temperatures and actual temperatures of the compartments, preset temperatures T1 of the compartments, fluid inlet temperatures Tr of environments where condensers are located and correction coefficients;
determining the target opening value d1 according to the following formula:
d1= r1*int{ 60-Et*T1/5+Cr*Tr/5+e1+Max[2*(△T1-1),0]}
wherein r1 is the on state value of the solenoid valve associated with the compartment; et is a preset temperature correction coefficient of the chamber; cr is a fluid inlet temperature correction coefficient of the environment where the condenser is located; e1 is a target opening dynamic correction value of the throttling device related to the compartment;
and controlling the valve body of each throttling device to operate to a target opening degree according to the target opening degree value of each throttling device so as to control the flow rate of the refrigerant flowing into each chamber in a one-to-one correspondence mode through each throttling device associated with each chamber.
2. The control method of claim 1, further comprising, prior to said obtaining the actual temperature of each compartment, the preset temperature of each compartment, the fluid inlet temperature of the environment in which the condenser is located, and the correction factor:
acquiring the conduction state of each electromagnetic valve associated with each chamber;
determining conduction state values of the electromagnetic valves associated with the chambers in a one-to-one correspondence manner according to the conduction states of the electromagnetic valves; when the electromagnetic valve is in an open state, the conduction state value of the electromagnetic valve is 1; when the electromagnetic valve is in a closed state, the conducting state value of the electromagnetic valve is 0;
determining whether each compartment has a refrigeration demand according to the conduction state value of the electromagnetic valve;
and if so, executing the step of acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and the correction coefficient.
3. The control method according to claim 2, before controlling the valve body of each of the throttle devices to operate to the target opening degree in accordance with the target opening degree of each of the throttle devices, further comprising:
determining a product of a conduction state value of the solenoid valve associated with the chamber and a target opening value of the throttling device associated with the chamber as a target opening value of the throttling device associated with the chamber.
4. The control method according to any one of claims 1 to 3, wherein the obtaining of the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment in which the condenser is located, and the correction coefficient comprises:
and acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is positioned and the correction coefficient at preset periods.
5. The control method according to claim 1, wherein the correction coefficients include an ambient temperature correction coefficient, a preset temperature correction coefficient, and a throttle device design opening dynamic correction value.
6. A control device for a refrigerant flow rate, comprising:
the information acquisition module is used for acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and a correction coefficient;
the target opening degree determining module is used for determining a target opening degree value of each throttling device associated with each compartment in a one-to-one correspondence mode according to the preset temperature of each compartment, the actual temperature of each compartment, the fluid inlet temperature of the environment where the condenser is located and the correction coefficient, and comprises the following steps: determining target opening values d1 of the throttling devices associated with the compartments in a one-to-one correspondence mode according to temperature differences delta T1 between preset temperatures and actual temperatures of the compartments, preset temperatures T1 of the compartments, fluid inlet temperatures Tr of environments where condensers are located and correction coefficients;
determining the target opening value d1 according to the following formula:
d1= r1*int{ 60-Et*T1/5+Cr*Tr/5+e1+Max[2*(△T1-1),0]}
wherein r1 is the on state value of the solenoid valve associated with the compartment; et is a preset temperature correction coefficient of the chamber; cr is a fluid inlet temperature correction coefficient of the environment where the condenser is located; e1 is a target opening dynamic correction value for the chamber-related throttle device
And the control module is used for controlling the valve body of each throttling device to operate to a target opening degree according to the target opening degree value of each throttling device so as to control the flow of the refrigerant flowing into each chamber in a one-to-one correspondence mode through each throttling device associated with each chamber.
7. The apparatus for controlling a flow rate of refrigerant according to claim 6, wherein the information acquisition module further comprises:
the electromagnetic valve state acquisition module is used for acquiring the conduction state of each electromagnetic valve associated with each chamber;
the state value determining module is used for determining the conduction state values of the electromagnetic valves related to the chambers in a one-to-one correspondence mode according to the conduction states of the electromagnetic valves; when the electromagnetic valve is in an open state, the conduction state value of the electromagnetic valve is 1; when the electromagnetic valve is in a closed state, the conducting state value of the electromagnetic valve is 0;
the refrigeration demand determining module is used for determining whether each compartment has a refrigeration demand according to the conduction state value of the electromagnetic valve; and if so, executing the step of acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is located and the correction coefficient.
8. The refrigerant flow rate control device according to claim 6, wherein the information acquisition module is specifically configured to:
and acquiring the actual temperature of each chamber, the preset temperature of each chamber, the fluid inlet temperature of the environment where the condenser is positioned and the correction coefficient at preset periods.
9. A refrigeration apparatus, comprising: the system comprises at least one chamber, at least one throttling device, at least one electromagnetic valve, at least one first temperature sensor, a second temperature sensor, a condenser, a compressor and a controller;
the first temperature sensors are arranged in the compartments in a one-to-one correspondence manner; the first temperature sensor is used for acquiring the actual temperature of the compartment;
the second temperature sensor is used for acquiring the fluid inlet temperature of the environment where the condenser is located;
the compressor is used for compressing refrigerant gas and transmitting the compressed refrigerant gas to the condenser for condensation through a gas pipeline, so that the condensed refrigerant is transmitted to the positions of the compartments through refrigerant pipelines corresponding to the compartments one to one;
the throttling device and the electromagnetic valve are arranged in each refrigerant pipeline in a one-to-one correspondence mode so as to control the refrigerant flow in each refrigerant pipeline;
the controller is configured to execute the method for controlling a flow rate of the refrigerant according to any one of claims 1 to 5.
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| CN114719477B (en) | 2023-01-10 |
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