CN114198954A - Refrigerant recovery control method and device and refrigerant recovery unit - Google Patents
Refrigerant recovery control method and device and refrigerant recovery unit Download PDFInfo
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- CN114198954A CN114198954A CN202111571921.XA CN202111571921A CN114198954A CN 114198954 A CN114198954 A CN 114198954A CN 202111571921 A CN202111571921 A CN 202111571921A CN 114198954 A CN114198954 A CN 114198954A
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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
- F25B45/00—Arrangements for charging or discharging refrigerant
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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
- F25B49/022—Compressor control arrangements
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Abstract
The invention provides a refrigerant recovery control method and device and a refrigerant recovery unit, and relates to the technical field of refrigerant recovery. The refrigerant recovery control method is applied to a refrigerant recovery unit, the refrigerant recovery unit comprises a first recovery pipeline, one end of the first recovery pipeline is connected to the unit to be recovered, and the other end of the first recovery pipeline is connected to a refrigerant container; the first recovery pipeline is provided with a compressor. The method comprises the step of controlling the compressor to increase or decrease the operation frequency according to the exhaust temperature value, the first preset exhaust temperature value, the current value and the preset current value so as to adjust the exhaust temperature of the compressor to approach the first preset exhaust temperature value. The refrigerant recovery control device and the refrigerant recovery unit provided by the invention can execute the refrigerant recovery control method so as to improve the condition of excessive energy waste caused by improving the refrigerant recovery efficiency in the prior art.
Description
Technical Field
The invention relates to the technical field of refrigerant recovery, in particular to a refrigerant recovery control method and device and a refrigerant recovery unit.
Background
The application and development of the refrigerant recovery equipment are slow, besides the environmental awareness of workers is not enough, an important reason is that many refrigerant recovery equipment have various defects of low recovery speed, low efficiency and the like in the practical application process at present, while the recovery equipment with relatively high recovery speed has the problems of large volume, inconvenience in carrying and the like, but some refrigerant recovery equipment have small volume and the recovery speed of portable equipment is relatively slow.
In the prior art, in order to improve the recovery efficiency of the refrigerant, the operation frequency of the compressor is adjusted by manpower according to self experience under normal conditions so as to achieve the purpose of rapidly recovering the refrigerant, but the operation frequency of the compressor cannot be accurately regulated and controlled by the method, so that the condition of excessive energy waste is caused, and the energy conservation of a refrigerant recovery unit is not facilitated.
Disclosure of Invention
The invention solves the problem of how to improve the condition of excessive energy waste caused by improving the recovery efficiency of the refrigerant in the prior art.
In order to solve the above problems, the present invention provides a refrigerant recovery control method, which is applied to a refrigerant recovery unit, wherein the refrigerant recovery unit comprises a first recovery pipeline, one end of the first recovery pipeline is connected to a unit to be recovered, and the other end of the first recovery pipeline is connected to a refrigerant container; a compressor is arranged on the first recovery pipeline;
the refrigerant recovery control method includes:
receiving an exhaust temperature value representing an exhaust temperature of the compressor;
receiving a current value representing a current of the compressor;
and controlling the compressor to increase or decrease the operating frequency according to the exhaust temperature value, a first preset exhaust temperature value, the current value and a preset current value so as to adjust the exhaust temperature of the compressor to approach the first preset exhaust temperature value.
Compared with the prior art, the refrigerant recovery control method provided by the invention has the beneficial effects that:
for the recovery speed of the refrigerant, the exhaust temperature value and the current value of the compressor in the refrigerant recovery unit are in a positive correlation with the recovery speed of the refrigerant, so that whether the recovery speed of the refrigerant reaches the optimum value can be judged by monitoring the exhaust temperature value and the current value of the compressor, and the exhaust temperature value of the compressor can be adjusted by adjusting the operating frequency of the compressor according to the exhaust temperature value and the current value of the compressor, so that the exhaust temperature value of the compressor can approach to a first preset exhaust temperature value, and the excessive consumption of energy caused by the overhigh operating frequency of the compressor is prevented under the condition that the refrigerant recovery speed is ensured to be the optimum value, thereby improving the technical problem of the excessive consumption of energy caused by the increase of the refrigerant recovery speed in the prior art.
In addition, because the monitoring of the exhaust temperature value has certain hysteresis, the current value of the compressor is synthesized to assist in controlling the compressor to adjust the operating frequency, so that the control precision can be improved.
Optionally, the step of controlling the compressor to increase or decrease the operation frequency according to the discharge temperature value, the first preset discharge temperature value, the current value and the preset current value includes:
acquiring a first temperature value and a second temperature value according to the first preset exhaust temperature value, wherein the first temperature value is greater than the second temperature value;
acquiring a first current value and a second current value according to the preset current value, wherein the first current value is larger than the second current value;
and controlling the compressor to increase or decrease the operating frequency according to the exhaust temperature value, the first temperature value, the second temperature value, the current value, the first current value and the second current value.
Optionally, the step of controlling the compressor to increase or decrease the operation frequency according to the discharge temperature value, the first temperature value, the second temperature value, the current value, the first current value, and the second current value includes:
if the exhaust temperature value is greater than the first temperature value, or if the current value is greater than the first current value, controlling the operating frequency of the compressor to be reduced until the exhaust temperature value is less than or equal to the first preset exhaust temperature value;
if the exhaust temperature value is smaller than the second temperature value, or if the current value is smaller than the second current value, controlling the operation frequency of the compressor to be increased until the exhaust temperature value is larger than or equal to the first preset exhaust temperature value;
and if the exhaust temperature value is less than or equal to the first temperature value and greater than or equal to the second temperature value, controlling the compressor to maintain the current operation frequency until the refrigerant is completely recovered.
In order to improve the accuracy of controlling the compressor to adjust the operating frequency, optionally, after the step of controlling the operating frequency of the compressor to decrease until the discharge temperature value is less than or equal to the first preset discharge temperature value, the refrigerant recovery control method further includes:
controlling the compressor to operate for a first preset time at the reduced operation frequency, if the exhaust temperature value is smaller than the second temperature value, returning to execute the step of controlling the operation frequency of the compressor to increase until the exhaust temperature value is larger than or equal to the first preset exhaust temperature value if the exhaust temperature value is smaller than the second temperature value, or if the current value is smaller than the second current value;
after the step of controlling the operating frequency of the compressor to increase until the discharge temperature value is greater than or equal to the first preset discharge temperature value, the refrigerant recovery control method further includes:
and controlling the compressor to operate for a second preset time at the increased operating frequency, if the exhaust temperature value is greater than the first temperature value, returning to execute the step of controlling the operating frequency of the compressor to be reduced until the exhaust temperature value is less than or equal to the first preset exhaust temperature value if the exhaust temperature value is greater than the first temperature value, or if the current value is greater than the first current value.
In order to prevent the operation frequency of the compressor from fluctuating repeatedly, optionally, the refrigerant recovery control method further includes:
counting once when the compressor is continuously controlled to increase the running frequency and decrease the running frequency;
and when the counting reaches the preset times, controlling the compressor to operate at the operating frequency after the compressor is controlled to increase the operating frequency for the next time until the refrigerant recovery is finished.
Optionally, the step of controlling the compressor to reduce the operating frequency comprises:
controlling the running frequency of the compressor to reduce a first preset frequency value every a third preset time;
the step of controlling the compressor to increase the operating frequency comprises:
controlling the running frequency of the compressor to increase by a second preset frequency value every fourth preset time;
and the third preset time is less than the fourth preset time.
Optionally, the step of obtaining a first temperature value and a second temperature value according to the first preset exhaust temperature value comprises:
adding a first value to the first preset exhaust temperature value to obtain a first temperature value;
subtracting a second value from the first preset exhaust temperature value to obtain a second temperature value;
the step of obtaining a first current value and a second current value according to the preset current value comprises the following steps;
adding a third value to the preset current value to obtain the first current value;
and subtracting a fourth value from the preset current value to obtain the second current value.
Optionally, before the step of receiving a discharge temperature value, the refrigerant recovery control method further comprises:
judging whether the recovery of the gaseous refrigerant is performed;
if yes, executing the step of receiving the exhaust temperature value;
if not, the compressor is controlled to be started, the running frequency of the compressor is controlled to be increased by a third preset frequency value every fifth preset time, and the step of receiving the first preset exhaust temperature value is started until the exhaust temperature of the compressor reaches a second preset exhaust temperature value.
A refrigerant recovery control device is applied to a refrigerant recovery unit, the refrigerant recovery unit comprises a first recovery pipeline, one end of the first recovery pipeline is connected to a unit to be recovered, and the other end of the first recovery pipeline is connected to a refrigerant container; a compressor is arranged on the first recovery pipeline; the refrigerant recovery control device includes:
a first receiving module to receive an exhaust temperature value, the exhaust temperature value representing an exhaust temperature of the compressor;
a second receiving module for receiving a current value representing a current of the compressor;
and the control module is used for controlling the compressor to increase or decrease the operating frequency according to the exhaust temperature value, a first preset exhaust temperature value, the current value and a preset current value so as to adjust the exhaust temperature of the compressor to approach the first preset exhaust temperature value.
A refrigerant recovery unit comprises a first recovery pipeline, a refrigerant container, a temperature detection device, a current detection device, a compressor and a controller;
one end of the first recovery pipeline is connected to the recovered unit, and the other end of the first recovery pipeline is connected to the refrigerant container; the compressor is arranged on the first recovery pipeline; the temperature detection device is arranged at an exhaust port of the compressor to detect the exhaust temperature value of the compressor; the current detection device is electrically connected with the compressor to detect the current value of the compressor; the temperature detection device is electrically connected with the controller to send the exhaust temperature value to the controller; the current detection device is electrically connected with the controller to send the current value to the controller; the controller is configured to execute the refrigerant recovery control method described above.
The refrigerant recovery control device and the refrigerant recovery unit provided by the invention can execute the refrigerant recovery control method, and the beneficial effects of the refrigerant recovery control device and the refrigerant recovery unit relative to the prior art are the same as the beneficial effects of the refrigerant recovery control method relative to the prior art, and are not repeated herein.
Drawings
Fig. 1 is a schematic structural diagram of a refrigerant recovery unit provided in an embodiment of the present application;
FIG. 2 is a flow chart of a refrigerant recovery control method provided in the practice of the present application;
FIG. 3 is a graph of discharge temperature of the compressor versus refrigerant recovery rate;
FIG. 4 is a graph of compressor current versus refrigerant recovery rate;
FIG. 5 is a flow chart of another portion of a refrigerant recovery control method provided in an embodiment of the present application;
fig. 6 is a flowchart of step S30 in the refrigerant recovery control method provided in the embodiment of the present application;
fig. 7 is a flowchart of step S33 in the refrigerant recovery control method provided in the embodiment of the present application;
FIG. 8 is a flow chart of yet another portion of a refrigerant recovery control method provided in an embodiment of the present application;
FIG. 9 is a flow chart of a portion of a refrigerant recovery control method provided in an embodiment of the present application;
FIG. 10 is a flow chart of a further portion of a refrigerant recovery control method provided in an embodiment of the present application;
fig. 11 shows a functional block schematic diagram of a refrigerant recovery control device provided in an embodiment of the present application.
Description of reference numerals:
10-a refrigerant recovery unit; 11-a recovered unit; 12-a refrigerant container; 13-a first recovery line; 131-a compressor; 132-a laval nozzle; 133-a condenser; 134-a first solenoid valve; 14-a second recovery line; 141-a second solenoid valve; 15-a third recovery line; 151-third solenoid valve; 16-a pressure boosting device; 20-refrigerant recovery control means; 21-a first receiving module; 22-a second receiving module; 23-control module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The application and development of the refrigerant recovery equipment are slow, and besides the environmental awareness of workers is not enough, an important reason is that many refrigerant recovery equipment have various defects of low recovery speed, low efficiency and the like in the practical application process at present.
In the prior art, in the process of recovering the refrigerant by using the refrigerant recovery device, in order to improve the recovery efficiency of the refrigerant, the operation frequency of the compressor is adjusted by manpower according to self experience under a normal condition, so that the refrigerant recovery device achieves the purpose of rapidly recovering the refrigerant, but the operation frequency of the compressor cannot be accurately regulated and controlled by the method, so that the condition of excessive energy waste is caused, and the energy conservation of a refrigerant recovery unit is not facilitated.
In order to improve the above problem, i.e. to improve the technical problem of excessive energy consumption caused by improving the refrigerant recovery efficiency in the prior art, the refrigerant recovery unit 10 of the present application is provided.
Referring to fig. 1, the refrigerant recovery unit 10 includes a refrigerant container 12, a first recovery line 13, a second recovery line 14, a third recovery line 15, and a pressurizing device 16. One end of the first recovery pipeline 13 is connected to the unit 11 to be recovered, and the other end is connected to the refrigerant container 12; the first recovery line 13 is provided with a compressor 131, a laval nozzle 132, a condenser 133, and a first solenoid valve 134, and when the refrigerant of the recovery unit 11 is recovered, the refrigerant passes through the compressor 131, the laval nozzle 132, the condenser 133, and the first solenoid valve 134 in this order, and then is recovered by the refrigerant container 12. In general, the first recovery line 13 is used to recover the refrigerant in a gaseous state. One end of the second recovery pipeline 14 is connected to the unit to be recovered 11, and the other end is connected to the refrigerant container 12, and a second electromagnetic valve 141 is disposed on the second recovery pipeline 14, and the second electromagnetic valve 141 is used for selectively opening or closing the second recovery pipeline 14. One end of the third recovery pipeline 15 is connected to the first recovery pipeline 13, and the third recovery pipeline 15 is connected between the laval nozzle 132 and the condenser 133 on the first recovery pipeline 13; the other end of the third recovery pipeline 15 is connected to the second recovery pipeline 14, and the third recovery pipeline 15 is connected between the second electromagnetic valve 141 on the second recovery pipeline 14 and the recovered unit 11. The third recovery line 15 is further provided with a third solenoid valve 151, and the third solenoid valve 151 is used to selectively open or close the third recovery line 15. The supercharging device 16 is used for connecting the recovered unit 11, and the supercharging device 16 is used for charging gas into the recovered unit 11 to increase the gas pressure in the recovered unit 11, so as to improve the recovery efficiency of the refrigerant. Alternatively, the pressure increasing device 16 may adopt a nitrogen device for filling nitrogen into the recovered unit 11 for the purpose of increasing the air pressure in the recovered unit 11.
In general, the unit to be recovered 11 contains a gaseous refrigerant and a liquid refrigerant, and in order to improve the recovery efficiency, the refrigerant recovery unit 10 according to the present application conducts the first recovery line 13 and the second recovery line 14 simultaneously when recovering the refrigerant from the unit to be recovered 11, so as to recover the gaseous refrigerant and recover the liquid refrigerant simultaneously.
Alternatively, when the refrigerant recovery unit 10 recovers the refrigerant in the recovered unit 11, the refrigerant recovery unit 10 starts the compressor 131, the compressor 131 extracts the gaseous refrigerant from the recovered unit 11, performs isentropic compression in the compressor 131 to form the high-temperature and high-pressure gaseous refrigerant, and then guides the gaseous refrigerant to the laval nozzle 132; after the gaseous refrigerant enters the laval nozzle 132, the gaseous refrigerant is accelerated in the laval nozzle 132 and forms a low pressure at the outlet end of the laval nozzle 132. The gaseous refrigerant exiting the laval nozzle 132 enters the condenser 133 and, after condensing in the condenser 133, is directed to the refrigerant container 12 for recovery.
In addition, in some embodiments of the present application, the end of the laval nozzle 132 is further provided with a pressure detecting device, and in case that the pressure detecting device detects that the pressure at the end of the laval nozzle 132 is reduced to a specified pressure, the second electromagnetic valve 141 may be closed and the third electromagnetic valve 151 may be opened; because the outlet end of the laval nozzle 132 forms a low pressure, and the pressure of the refrigerant is increased by the pressure increasing device 16 in the recovery unit 11, the liquid refrigerant is guided to the condenser 133 through the third recovery line 15 under the condition of pressure difference to be mixed with the gaseous refrigerant, so that the mixed recovery of the gaseous refrigerant and the liquid refrigerant is performed.
It should be noted that, in general, the recovery rate of the liquid refrigerant is greater than that of the gaseous refrigerant, and the liquid refrigerant is volatilized during the recovery process of the liquid refrigerant, and therefore, the liquid refrigerant is generally recovered in the recovery unit 11. After the liquid refrigerant recovery is completed, pure gaseous refrigerant recovery is performed.
In the case that the refrigerant recovery unit 10 enters a pure gas state for refrigerant recovery, an operator can only control the compressor 131 to adjust the operation frequency according to personal experience in order to adjust the recovery speed of the refrigerant, which usually causes excessive energy consumption and is not beneficial to energy saving of the refrigerant recovery unit 10. Of course, in the process of performing mixed recovery of the gaseous refrigerant and the liquid refrigerant, the above-described problem is also easily caused in the recovery of the refrigerant depending on the experience of the operator.
In order to prevent excessive consumption of energy while precisely controlling the operation frequency of the compressor 131, the refrigerant recovery unit 10 further includes a temperature detection device, a current detection device, and a controller. The temperature detection device is arranged at the exhaust pipe of the compressor 131 and used for detecting the exhaust temperature value of the compressor 131; the current detection device is electrically connected to the compressor 131 to detect a current value of the compressor 131. The temperature detection device and the current detection device are electrically connected with the controller, the temperature detection device can send an exhaust temperature value to the controller, the current detection device can send a current value to the controller, and the controller can control the compressor 131 to adjust the running frequency according to the exhaust temperature value and the current value so as to adjust the recovery speed of the refrigerant.
The controller may be an integrated circuit chip having signal processing capabilities. The controller may be a general-purpose processor, and may include a Central Processing Unit (CPU), a single chip Microcomputer (MCU), a Micro Controller Unit (MCU), a Complex Programmable Logic Device (CPLD), a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an embedded ARM, and other chips, where the controller may implement or execute the methods, steps, and Logic blocks disclosed in the embodiments of the present invention.
In a possible implementation, the refrigerant recovery assembly 10 may further include a memory for storing program instructions executable by a controller, such as the refrigerant recovery control device 20 provided in the embodiment of the present application, and the refrigerant recovery control device 20 provided in the embodiment of the present application includes at least one of software and firmware stored in the memory. The Memory may be a stand-alone external Memory including, but not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Read-Only Memory (EPROM), electrically Erasable Read-Only Memory (EEPROM). The memory may also be integrated with the controller, for example, the memory may be integrated with the controller on the same chip.
Based on the refrigerant recovery unit 10 provided above, the embodiment of the present application further provides a refrigerant recovery control method, which is used to solve the technical problem of excessive energy waste caused by increasing the refrigerant recovery speed in the prior art.
Referring to fig. 2, the refrigerant recovery control method includes:
and step S10, receiving the exhaust temperature value.
Step S20, the current value is received.
Wherein the discharge temperature value represents a discharge temperature of the compressor 131, and is detected and generated by the temperature detecting means, which then sends the discharge temperature value to the controller. In addition, the current value represents a current of the compressor 131 in an operation state, and is detected and generated by the current detection means, and then the current detection means transmits the current value to the controller.
In the embodiment of the present application, the receiving operation in step S10 and step S20 is a real-time receiving operation, that is, the temperature detection device detects and generates the exhaust temperature value in real time, and the current detection device detects and generates the current value in real time.
Step S30, controlling the compressor 131 to increase or decrease the operation frequency according to the discharge temperature value, the first preset discharge temperature value, the current value and the preset current value.
However, when the operating frequency of the compressor 131 increases, the discharge temperature of the compressor 131 increases, and the current of the compressor 131 also increases. In the process of recovering the refrigerant, the relationship between the recovery speed of the refrigerant and the discharge temperature value of the compressor 131 is shown in fig. 3, wherein the abscissa in the figure represents the discharge temperature value of the compressor 131, the ordinate represents the recovery speed of the refrigerant, and Ta ℃ in fig. 3 represents a first preset discharge temperature value, and it can be seen that, in the section of the discharge temperature value from 35 ℃ to Ta ℃, the higher the discharge temperature value is, the faster the corresponding refrigerant recovery speed is; and in the interval that the exhaust temperature value is greater than Ta ℃, the exhaust temperature value continues to rise in time, and the influence on the recovery speed of the refrigerant is very little. Therefore, the operation frequency of the compressor 131 can be regulated according to the exhaust temperature value and the first preset exhaust temperature value, so that the operation frequency of the compressor 131 can be accurately regulated to prevent excessive consumption of energy. Of course, since the temperature monitoring has a certain hysteresis, the accuracy of the adjustment of the operating frequency of the compressor 131 can be further improved by performing the assist control using the current value of the compressor 131 based on this. It should be noted that the relationship between the current of the compressor 131 and the refrigerant recovery speed is substantially as shown in fig. 4, the abscissa indicates the current value of the compressor 131, the ordinate indicates the refrigerant recovery speed, and Ia in the figure indicates the preset current value. The current value of the compressor 131 is substantially Ia under the condition that the discharge temperature value of the compressor 131 is Ta ℃ and remains stable, based on which, the operation frequency of the compressor 131 can be adjusted according to the discharge temperature value, the first preset discharge temperature value, the current value and the preset current value at the same time, and the operation frequency of the compressor 131 can be adjusted to optimize the refrigerant recovery speed while ensuring the adjustment accuracy, and meanwhile, the situation of excessive energy consumption is avoided. Therefore, the technical problem of excessive energy consumption caused by the increase of the refrigerant recovery speed in the prior art can be solved.
Optionally, the first preset exhaust temperature value ranges from 80 ℃ to 90 ℃, in other words, the first preset exhaust temperature value may be 81 ℃, 82 ℃, 83 ℃, 84 ℃, 85 ℃, 86 ℃, 87 ℃, 88 ℃, 89 ℃, or 90 ℃ or the like. In addition, the preset current value ranges from 8A to 14A, in other words, the preset current value may be 8A, 9A, 10A, 11A, 12A, 13A, 14A, or the like. It should be noted that values of the first preset exhaust temperature value and the preset current value may be set according to an actual displacement of the compressor 131, for example, in the compressor 131 with a displacement of 27.5ML, the first preset exhaust temperature value may be set to 85 ℃, the preset current value may be set to 11A, and the like.
In some embodiments of the present application, the refrigerant recovery control method is generally used for recovering pure gaseous refrigerant, in other words, in the case that the recovery of liquid refrigerant in the recovery unit 11 is completed, the above-mentioned refrigerant recovery control method may be triggered. Based on this, in some embodiments of the present application, the refrigerant recovery unit 10 includes at least two pressure detection devices. One of the pressure detecting devices is disposed at the outlet end of the laval nozzle 132 between the laval nozzle 132 and the third recovery branch, and is configured to detect a pressure value of the refrigerant at the outlet end of the laval coil, which may also represent a pressure value before the gaseous refrigerant and the liquid refrigerant are mixed. Another pressure detecting means for detecting a pressure value of the first recovery line 13 after the gaseous refrigerant and the liquid refrigerant are mixed is provided on the first recovery line 13 between the third recovery line 15 and the condenser 133.
When the third recovery line 15 introduces the liquid refrigerant into the first recovery line 13, the position at which the third recovery line 15 and the first recovery line 13 are connected is the mixing point of the gas refrigerant and the liquid refrigerant. The two pressure detection devices are respectively used for detecting the pressure values before and after the mixing point on the first recovery pipeline 13.
In the case where the liquid refrigerant is still present in the recovered unit 11, the above-described mixing point is a point where the gaseous refrigerant and the liquid refrigerant are mixed, and thus the pressure values before and after the mixing point are different. When the liquid refrigerant is recovered, there is no liquid refrigerant at the mixing point, so that the pressure values before and after the mixing point are not greatly different. Based on this, referring to fig. 5, before step S10, the refrigerant recovery control method provided by the present application may further include:
and step S05, receiving the front pressure value and the rear pressure value.
Wherein the front pressure value represents the pressure value before the mixing point in the first recovery line 13 and the rear pressure value represents the pressure value after the mixing point in the first recovery line 13.
Step S06, if the difference between the front pressure value and the rear pressure value is less than or equal to the preset pressure value, the frequency control mode of the compressor 131 is turned on.
If the difference value between the front pressure value and the rear pressure value is smaller than or equal to the preset pressure value, the difference between the front pressure value and the rear pressure value is not large, the front pressure value and the rear pressure value can also be considered to be approximately equal, and based on the difference value, the recovery of the liquid refrigerant is finished, and the refrigerant recovery control method can be triggered to recover the pure-gas refrigerant.
It should be noted that the frequency control mode of the compressor 131 is a control mode in which the compressor 131 can perform operation frequency adjustment according to the discharge temperature value, the current value, the first preset discharge temperature value, and the preset current value, so that after the controller receives the discharge temperature value and the current value of the compressor 131, the operation frequency of the compressor 131 can be adjusted. In addition, when the frequency control mode of the compressor 131 is entered, the controller controls the third electromagnetic valve 151 to be closed and controls the second electromagnetic valve 141 to be opened, so that the recovery of the gaseous refrigerant can be simultaneously performed through the first recovery line 13 and the second recovery line 14, thereby further improving the recovery efficiency.
Alternatively, the preset pressure value may range from 0 to 0.05MPa, in other words, the preset pressure value may range from 0.01MPa, 0.02MPa, 0.03MPa, 0.04MPa, or 0.05MPa, etc.
It should be noted that, in other embodiments of the present application, the refrigerant recovery control method provided above may also be applied to the recovery of general gaseous refrigerant, in other words, in the case that liquid refrigerant exists in the recovered unit 11, the refrigerant recovery unit 10 may also perform the refrigerant recovery control method described above to increase the recovery speed of gaseous refrigerant. For example, when the refrigerant recovery unit 10 is just connected to the unit 11 to be recovered to recover the refrigerant, the above-mentioned frequency control mode of the compressor 131 can be entered to adjust the operating frequency of the compressor 131, thereby improving the recovery efficiency.
In an embodiment of the present application, referring to fig. 6, step S30 may include:
and step S31, acquiring a first temperature value and a second temperature value according to the first preset exhaust temperature value.
Step S32, obtaining a first current value and a second current value according to a preset current value.
The first temperature value is greater than the second temperature value, and the first current value is greater than the second current value.
It should be noted that, since the discharge temperature value is difficult to be maintained at a specific temperature value and the current value is difficult to be maintained at a specific current value, if the operation frequency of the compressor 131 is directly adjusted according to the first preset discharge temperature value as the threshold value or the operation frequency of the compressor 131 is directly adjusted according to the preset current value as the threshold value to control the discharge temperature value of the compressor 131 to approach the first preset discharge temperature value, the frequency of the compressor 131 may fluctuate repeatedly, and the compressor 131 may malfunction instead. Based on this, the first temperature value and the second temperature value can be obtained according to the first preset exhaust temperature value as the threshold value, and the first current value and the second current value can be obtained according to the preset current value as the threshold value to perform frequency modulation control on the compressor 131, so that the situation that the operation frequency of the compressor 131 fluctuates repeatedly can be prevented while ensuring the adjustment accuracy.
Alternatively, the method for acquiring the first temperature value and the second temperature value in step S31 may be as follows: and subtracting the second value from the first preset exhaust temperature value to obtain a second temperature value. Wherein, the value range of the first value is 0.5-1.5 ℃; in other words, the first value may take on a value of 0.5 ℃, 0.6 ℃, 0.7 ℃, 0.8 ℃, 0.9 ℃, 1 ℃, 1.1 ℃, 1.2 ℃, 1.3 ℃, 1.4 ℃, or 1.5 ℃ or the like. In addition, the value range of the second value is 0.5-1.5 ℃; in other words, the second value may take a value of 0.5 ℃, 0.6 ℃, 0.7 ℃, 0.8 ℃, 0.9 ℃, 1 ℃, 1.1 ℃, 1.2 ℃, 1.3 ℃, 1.4 ℃, or 1.5 ℃ or the like. The first value and the second value may be the same value, but of course, the first value and the second value may be different.
Alternatively, the method of acquiring the first current value and the second current value in step S32 may be as follows: and subtracting the fourth value from the preset current value to obtain a second current value. The value range of the third value is 0.1A-0.4A, in other words, the value of the third value may be 0.1A, 0.15A, 0.2A, 0.25A, 0.3A, 0.35A, 0.4A, or the like. The value of the fourth value ranges from 0.1A to 0.4A, in other words, the value of the fourth value may be 0.1A, 0.15A, 0.2A, 0.25A, 0.3A, 0.35A, 0.4A, or the like. Of course, the third value and the fourth value may be the same value or different values.
It should be understood that in other embodiments of the present application, the first temperature value and the second temperature value may be selected in other manners, for example, based on the first preset exhaust temperature value, the first preset exhaust temperature value multiplied by the corresponding coefficient to obtain the first temperature value and the second temperature value, and so on. Alternatively, in still other embodiments, the setting of the first and second temperature values may be performed in a manner deemed to be set. Similarly, the first current value and the second current value may be selected in other manners, for example, the first current value and the second current value are obtained by taking the preset current value as a base number and multiplying the preset current value by the corresponding coefficient. Alternatively, the first current value and the second current value may be selected directly by a manner of setting.
Step S33, controlling the compressor 131 to increase or decrease the operation frequency according to the discharge temperature value, the first temperature value, the second temperature value, the current value, the first current value and the second current value.
Alternatively, referring to fig. 7, step S33 may include:
step S331, if the exhaust temperature value is greater than the first temperature value, or if the current value is greater than the first current value, controlling the operating frequency of the compressor 131 to decrease until the exhaust temperature value is less than or equal to a first preset exhaust temperature value and the current value is less than a preset current value.
Alternatively, in the embodiment of the present application, the manner of controlling the operating frequency of the compressor 131 to decrease is substantially as follows: the operating frequency of the compressor 131 is controlled to decrease the first preset frequency value every third preset time. In other words, the operation frequency of the compressor 131 is intermittently reduced to slowly reduce the operation frequency of the compressor 131 to prevent the operation frequency from being excessively adjusted.
Optionally, the third preset time has a value in a range of 20s to 30s, in other words, the value of the third preset time may be 20s, 21s, 22s, 23s, 24s, 25s, 26s, 27s, 28s, 29s, or 30 s. The first predetermined frequency value ranges from 1Hz to 3Hz, in other words, the first predetermined frequency value may range from 1Hz, 2Hz, or 3 Hz.
Step S332, if the exhaust temperature value is smaller than the second temperature value, or if the current value is smaller than the second current value, controlling the operating frequency of the compressor 131 to increase until the exhaust temperature value is greater than or equal to the first preset exhaust temperature value and the current value is greater than the preset current value.
Alternatively, in the embodiment of the present application, the manner of controlling the operating frequency of the compressor 131 to be increased is substantially as follows: the operating frequency of the compressor 131 is controlled to be increased by the second preset frequency value every fourth preset time. In other words, the operation frequency of the compressor 131 is increased intermittently to increase the operation frequency of the compressor 131 slowly to prevent the operation frequency from being excessively adjusted.
Optionally, the value of the fourth preset time ranges from 30s to 40s, in other words, the value of the fourth preset time may be 30s, 31s, 32s, 33s, 34s, 35s, 36s, 37s, 38s, 39s, or 40 s. The second predetermined frequency value ranges from 1Hz to 3Hz, in other words, the second predetermined frequency value may range from 1Hz, 2Hz, or 3 Hz.
It is worth to say that, since the speed of temperature increase is fast in the case of increasing the operating frequency, the interval at which the operating frequency is increased by the compressor 131 is controlled to be set long based on this, so as to prevent the over-regulation caused by the excessively fast temperature increase.
Step S333, if the discharge temperature value is less than or equal to the first temperature value and greater than or equal to the second temperature value, controlling the compressor 131 to maintain the current operating frequency until the refrigerant is completely recovered.
In the case that the discharge temperature value is greater than the first temperature value or the current value is greater than the first current value, it indicates that the operation frequency of the compressor 131 is too high, which results in excessive waste of energy of the refrigerant recovery unit 10, and thus, the compressor 131 may be controlled to reduce the operation frequency, so as to reduce the discharge temperature value of the compressor 131 to the first preset discharge temperature value, and reduce the current value of the compressor 131 to the preset current value, so as to optimize the operation frequency of the compressor 131, and thus, under the condition that the speed of refrigerant recovery is ensured to be optimal, the situation of excessive energy consumption is prevented.
In the case that the discharge temperature value is less than the second temperature value, or the current value is less than the second current value, it indicates that the operation frequency of the compressor 131 is low so that the recovery speed of the refrigerant has not yet reached the optimum, based on which, the compressor 131 may be controlled to increase the operation frequency so as to increase the discharge temperature value of the compressor 131 to the first preset discharge temperature value and to increase the current value of the compressor 131 to the preset current value, thereby making the recovery speed of the refrigerant reach the optimum.
Of course, if the discharge temperature value is less than or equal to the first temperature value and greater than or equal to the second temperature value, it indicates that the current discharge temperature value of the compressor 131 approaches the first preset discharge temperature value, and further indicates that the refrigerant recovery speed at this time approaches the optimum value.
It should be noted that, the order of step S331, step S332, and step S333 is not limited, and the corresponding steps may be executed when any condition is satisfied.
In addition, after the steps S331 and S332, in order to ensure that the operation frequency of the compressor 131 is accurately adjusted, the refrigerant recovery control method provided in the present application may further continue to determine whether the discharge temperature value of the compressor 131 approaches the first preset discharge temperature value.
For example, referring to fig. 8, after step S331, the refrigerant recovery control method further includes:
step S301, the compressor 131 is controlled to operate for a first preset time with the reduced operation frequency, if the exhaust temperature value is less than the second temperature value or the current value is less than the second current value, the step is returned to execute if the exhaust temperature value is less than the second temperature value, or if the current value is less than the second current value, the operation frequency of the compressor 131 is controlled to increase until the exhaust temperature value is greater than or equal to the first preset exhaust temperature value and the current value is greater than or equal to the preset current value.
In other words, after the frequency reduction control of the compressor 131 is performed, the compressor 131 is controlled to operate for a first preset time, so that the compressor 131 reaches a stable state, and it is determined again whether the discharge temperature value of the compressor 131 approaches the first preset discharge temperature value and whether the current value of the compressor 131 approaches the preset current value. If the discharge temperature value of the compressor 131 is less than the second temperature value or the current value of the compressor 131 is less than the second current value, it indicates that the frequency reduction control for the compressor 131 is excessive, so as to reduce the refrigerant recovery speed, and based on this, step S332 is executed again to increase the frequency of the compressor 131 to achieve the purpose of increasing the refrigerant recovery speed.
Similarly, after step S332, the refrigerant recovery control method includes:
step S302, controlling the compressor 131 to operate for a second preset time at the increased operating frequency, and if the exhaust temperature value is greater than the first temperature value or the current value is greater than the first current value, returning to execute the step of if the exhaust temperature value is greater than the first temperature value, or if the current value is greater than the first current value, controlling the operating frequency of the compressor 131 to decrease until the exhaust temperature value is less than or equal to the first preset exhaust temperature value and the current value is less than or equal to the preset current value.
In other words, after the up-conversion control of the compressor 131 is performed, the compressor 131 is controlled to operate for a second preset time, so that the compressor 131 reaches a stable state, and it is determined again whether the discharge temperature value of the compressor 131 approaches the first preset discharge temperature value and whether the current value of the compressor 131 approaches the preset current value. If the discharge temperature value of the compressor 131 is greater than the first temperature value or the current value of the compressor 131 is greater than the first current value, it indicates that the frequency-up control on the compressor 131 is excessive, so that the operating frequency of the refrigerant recovery unit 10 is too high and the energy is excessively consumed, based on this, step S331 is executed again to reduce the frequency of the compressor 131, so as to achieve the purpose of preventing the refrigerant recovery unit 10 from excessively consuming energy.
Optionally, in some embodiments of the application, a value of the first preset time may range from 1min to 3min, in other words, a value of the first preset time may range from 1min, 1.5min, 2min, 2.5min, or 3 min. In addition, the value range of the second preset time may be 1min to 3min, in other words, the value of the second preset time may be 1min, 1.5min, 2min, 2.5min, or 3min, and the like. The first preset time and the second preset time may be the same value, or the first preset time and the second preset time may be different values.
Of course, referring to fig. 9, in order to prevent the repeated up-conversion control and down-conversion control of the compressor 131 from causing the operation frequency of the compressor 131 to fluctuate repeatedly, optionally, in an embodiment of the present application, the refrigerant recovery control method further includes:
step S41, when the compressor 131 is continuously controlled to increase the operating frequency and decrease the operating frequency, the sequential counting is performed.
In other words, the controller counts once every time the compressor 131 continuously performs the up-conversion control and the down-conversion control, and the controller counts again in an accumulation manner when the up-conversion control and the down-conversion control are continuously performed another time.
In step S42, when the count reaches the preset number, the operation frequency after the next control of the compressor 131 to increase the operation frequency controls the compressor 131 to operate until the refrigerant recovery is completed.
In other words, in order to prevent the repetition of the up-conversion control and the down-conversion control of the compressor 131, when the count reaches the preset number, it indicates that the up-conversion control and the down-conversion control of the operation frequency of the compressor 131 have been performed a plurality of times, and it is difficult to adjust the discharge temperature value of the compressor 131 to a state approaching the first preset discharge temperature value, so that it is possible to control the operation of the compressor 131 to complete the recovery of the refrigerant at the increased operation frequency after the next up-conversion control. This prevents the compressor 131 from repeatedly adjusting the operating frequency to repeatedly fluctuate the operating frequency, and also ensures the optimum refrigerant recovery rate, thereby improving the refrigerant recovery efficiency.
In the embodiment of the present application, the recovery of the pure gas refrigerant is performed at the end of the process of performing the gas-liquid mixture recovery, and the compressor 131 is in an operating state at this time, and the refrigerant recovery control method described above may be directly performed. Of course, in other embodiments, if the recovered unit 11 only contains gaseous refrigerant, or it is inconvenient to recover liquid refrigerant, or only the first recovery pipe 13 is available, and the compressor 131 is in the state of being started up immediately at this time, in order to ensure that the refrigerant recovery control method operates stably, referring to fig. 10, before step S10, the refrigerant recovery control method further includes:
step S01 determines whether or not the recovery of the gaseous refrigerant has been performed.
In step S02, if yes, the frequency control mode of the compressor 131 is executed.
In other words, if the recovery of the gaseous refrigerant has already been performed, the process may proceed to step S10.
In general, the recovery unit 11 contains both the gaseous refrigerant and the liquid refrigerant, and therefore, both the gaseous refrigerant and the liquid refrigerant are recovered to improve the recovery efficiency. After the recovery process is performed for a while, the recovery of the liquid refrigerant is completed and the gaseous refrigerant remains, and based on this, in the case that the determination result of step S01 is yes, it indicates that the recovery of the gaseous refrigerant has been performed before, and at this time, the frequency control mode of the compressor 131 may be directly started.
Step S03, if not, the compressor 131 is controlled to be started, and the operation frequency of the compressor 131 is controlled to increase by a third preset frequency value every fifth preset time, until the discharge temperature of the compressor 131 reaches the second preset discharge temperature value, the frequency control mode of the compressor 131 is started.
In other words, if the recovery of the gaseous refrigerant is not performed before, for example, in the case that only the gaseous refrigerant exists in the recovered unit 11, or in the case that it is inconvenient to perform the recovery of the liquid refrigerant, the refrigerant recovery control method provided by the present application may be performed, so that it is necessary to control the operation frequency of the compressor 131 to be increased enough to make the discharge temperature value of the compressor 131 reach the third preset temperature value, in other words, the speed of the refrigerant recovery is directly increased to be close to the optimal recovery speed, so that the refrigerant can be rapidly recovered while controlling the operation frequency of the compressor 131 to adjust, thereby improving the overall recovery efficiency.
Optionally, the value of the fifth preset time ranges from 5s to 15s, in other words, the value of the fifth preset time may be 5s, 6s, 7s, 8s, 9s, 10s, 11s, 12s, 13s, 14s, or 15 s. In addition, the third preset frequency value ranges from 1Hz to 3Hz, in other words, the third preset frequency value can be 1Hz, 2Hz or 3 Hz.
It is noted that steps S01 and S02 are required to be performed before steps S05 and S06, in other words, after steps S01 and S02, so that step S05 and step S06 are performed to proceed to step S10 to control the operating frequency of the compressor 131.
In summary, according to the refrigerant recovery unit 10 and the refrigerant recovery control method provided in the embodiments of the present application, since the discharge temperature value and the current value of the compressor 131 in the refrigerant recovery unit 10 are in a positive correlation with the recovery speed of the refrigerant, it can be determined whether the recovery speed of the refrigerant is optimal by monitoring the discharge temperature value and the current value of the compressor 131, and the discharge temperature value of the compressor 131 can be adjusted by adjusting the operating frequency of the compressor 131 according to the discharge temperature value of the compressor 131 and the current value of the compressor 131, so that the discharge temperature value of the compressor 131 can approach to the first preset discharge temperature value, and the excessive consumption of energy due to the excessively high operating frequency of the compressor 131 can be prevented while ensuring that the recovery speed of the refrigerant is optimal, thereby improving the technical problem of excessive energy consumption caused by improving the refrigerant recovery speed in the prior art.
In order to execute possible steps of the refrigerant recovery control method provided above, fig. 11 shows a functional block schematic diagram of a refrigerant recovery control device 20 provided in an embodiment of the present application, as shown in fig. 11. The refrigerant recovery control device 20 is applied to the refrigerant recovery unit 10, and is configured to execute the above-described refrigerant recovery control method. It should be noted that the basic principle and the technical effects of the refrigerant recovery control device 20 provided in the present embodiment are substantially the same as those of the above embodiments, and for the sake of brief description, no part of the present embodiment is mentioned, and reference may be made to the corresponding contents in the above embodiments.
The refrigerant recovery control device 20 includes a first receiving module 21, a second receiving module 22, and a control module 23.
The first receiving module 21 is configured to receive an exhaust temperature value, which represents an exhaust temperature of the compressor 131.
Optionally, the first receiving module 21 may be configured to execute step S10 in the above-mentioned respective diagrams to achieve the corresponding technical effect.
The second receiving module 22 is configured to receive a current value, which represents a current of the compressor 131.
Optionally, the second receiving module 22 may be configured to execute step S20 in the above-mentioned respective figures to achieve the corresponding technical effect.
Alternatively, the first receiving module 21 and the second receiving module 22 may be integrated to form one integral module. In addition, the first receiving module 21 or the second receiving module 22 may also be used to execute step S05 to achieve the corresponding technical effect.
The control module 23 is configured to control the compressor 131 to increase or decrease the operation frequency according to the exhaust temperature value, the first preset exhaust temperature value, the current value, and the preset current value, so as to adjust the exhaust temperature of the compressor 131 to approach the first preset exhaust temperature value.
Alternatively, the control module 23 may be configured to execute step S30 and its sub-steps in the above-mentioned respective figures to achieve the corresponding technical effect.
Of course, the control module 23 may also be used to execute the steps S01, S02, S06, etc. in the above-mentioned respective figures to achieve the corresponding technical effects.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The refrigerant recovery control method is applied to a refrigerant recovery unit and is characterized in that the refrigerant recovery unit comprises a first recovery pipeline, one end of the first recovery pipeline is connected to the unit to be recovered, and the other end of the first recovery pipeline is connected to a refrigerant container; a compressor is arranged on the first recovery pipeline;
the refrigerant recovery control method includes:
receiving an exhaust temperature value representing an exhaust temperature of the compressor;
receiving a current value representing a current of the compressor;
and controlling the compressor to increase or decrease the operating frequency according to the exhaust temperature value, a first preset exhaust temperature value, the current value and a preset current value so as to adjust the exhaust temperature of the compressor to approach the first preset exhaust temperature value.
2. The refrigerant recovery control method as set forth in claim 1, wherein the step of controlling the compressor to increase or decrease the operation frequency according to the discharge temperature value, a first preset discharge temperature value, the current value and a preset current value comprises:
acquiring a first temperature value and a second temperature value according to the first preset exhaust temperature value, wherein the first temperature value is greater than the second temperature value;
acquiring a first current value and a second current value according to the preset current value, wherein the first current value is larger than the second current value;
and controlling the compressor to increase or decrease the operating frequency according to the exhaust temperature value, the first temperature value, the second temperature value, the current value, the first current value and the second current value.
3. The refrigerant recovery control method according to claim 2, wherein the step of controlling the compressor to increase or decrease the operation frequency in accordance with the discharge temperature value, the first temperature value, the second temperature value, the current value, the first current value, and the second current value includes:
if the exhaust temperature value is greater than the first temperature value, or if the current value is greater than the first current value, controlling the operating frequency of the compressor to be reduced until the exhaust temperature value is less than or equal to the first preset exhaust temperature value and the current value is less than or equal to the preset current value;
if the exhaust temperature value is smaller than the second temperature value, or if the current value is smaller than the second current value, controlling the operation frequency of the compressor to be increased until the exhaust temperature value is larger than or equal to the first preset exhaust temperature value and the current value is larger than or equal to the preset current value;
and if the exhaust temperature value is less than or equal to the first temperature value and greater than or equal to the second temperature value, controlling the compressor to maintain the current operation frequency until the refrigerant is completely recovered.
4. The refrigerant recovery control method according to claim 3, wherein after the step of controlling the operating frequency of the compressor to be decreased until the discharge temperature value is less than or equal to the first preset discharge temperature value, the refrigerant recovery control method further comprises:
controlling the compressor to operate for a first preset time at the reduced operation frequency, if the exhaust temperature value is smaller than the second temperature value or the current value is smaller than the second current value, returning to execute the step of controlling the operation frequency of the compressor to increase if the exhaust temperature value is smaller than the second temperature value, or if the current value is smaller than the second current value until the exhaust temperature value is greater than or equal to the first preset exhaust temperature value and the current value is greater than or equal to the preset current value;
after the step of controlling the operating frequency of the compressor to increase until the discharge temperature value is greater than or equal to the first preset discharge temperature value, the refrigerant recovery control method further includes:
and controlling the compressor to operate for a second preset time at the increased operating frequency, returning to execute the step of controlling the operating frequency of the compressor to be reduced if the exhaust temperature value is greater than the first temperature value or if the current value is greater than the first current value until the exhaust temperature value is less than or equal to the first preset exhaust temperature value and the current value is less than or equal to the preset current value if the exhaust temperature value is greater than the first temperature value.
5. The refrigerant recovery control method according to claim 4, further comprising:
counting once when the compressor is continuously controlled to increase the running frequency and decrease the running frequency;
and when the counting reaches the preset times, controlling the compressor to operate at the operating frequency after the compressor is controlled to increase the operating frequency for the next time until the refrigerant recovery is finished.
6. The refrigerant recovery control method as recited in claim 3, wherein the step of controlling the compressor to lower the operating frequency comprises:
controlling the running frequency of the compressor to reduce a first preset frequency value every a third preset time;
the step of controlling the compressor to increase the operating frequency comprises:
controlling the running frequency of the compressor to increase by a second preset frequency value every fourth preset time;
and the third preset time is less than the fourth preset time.
7. The refrigerant recovery control method according to claim 2, wherein the step of obtaining a first temperature value and a second temperature value from the first preset discharge temperature value includes:
adding a first value to the first preset exhaust temperature value to obtain a first temperature value;
subtracting a second value from the first preset exhaust temperature value to obtain a second temperature value;
the step of obtaining a first current value and a second current value according to the preset current value comprises the following steps;
adding a third value to the preset current value to obtain the first current value;
and subtracting a fourth value from the preset current value to obtain the second current value.
8. The refrigerant recovery control method according to any one of claims 1 to 7, further comprising, before the step of receiving a discharge temperature value:
judging whether the recovery of the gaseous refrigerant is performed;
if yes, executing the step of receiving the exhaust temperature value;
if not, the compressor is controlled to be started, the running frequency of the compressor is controlled to be increased by a third preset frequency value every fifth preset time, and the step of receiving the first preset exhaust temperature value is started until the exhaust temperature of the compressor reaches a second preset exhaust temperature value.
9. The refrigerant recovery control device is applied to a refrigerant recovery unit and is characterized in that the refrigerant recovery unit comprises a first recovery pipeline, one end of the first recovery pipeline is connected to the unit to be recovered, and the other end of the first recovery pipeline is connected to a refrigerant container; a compressor is arranged on the first recovery pipeline; the refrigerant recovery control device includes:
a first receiving module to receive an exhaust temperature value, the exhaust temperature value representing an exhaust temperature of the compressor;
a second receiving module for receiving a current value representing a current of the compressor;
and the control module is used for controlling the compressor to increase or decrease the operating frequency according to the exhaust temperature value, a first preset exhaust temperature value, the current value and a preset current value so as to adjust the exhaust temperature of the compressor to approach the first preset exhaust temperature value.
10. The refrigerant recovery unit is characterized by comprising a first recovery pipeline, a refrigerant container, a temperature detection device, a current detection device, a compressor and a controller;
one end of the first recovery pipeline is connected to the recovered unit, and the other end of the first recovery pipeline is connected to the refrigerant container; the compressor is arranged on the first recovery pipeline; the temperature detection device is arranged at an exhaust port of the compressor to detect the exhaust temperature value of the compressor; the current detection device is electrically connected with the compressor to detect the current value of the compressor; the temperature detection device is electrically connected with the controller to send the exhaust temperature value to the controller; the current detection device is electrically connected with the controller to send the current value to the controller; the controller is configured to execute the refrigerant recovery control method according to any one of claims 1 to 8.
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| CN115096024A (en) * | 2022-06-21 | 2022-09-23 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery system |
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