CN114234501A - Refrigerant recovery method, control device and refrigerant recovery device - Google Patents
Refrigerant recovery method, control device and refrigerant recovery device Download PDFInfo
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- CN114234501A CN114234501A CN202111571924.3A CN202111571924A CN114234501A CN 114234501 A CN114234501 A CN 114234501A CN 202111571924 A CN202111571924 A CN 202111571924A CN 114234501 A CN114234501 A CN 114234501A
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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 method, a control device and a refrigerant recovery device, and relates to the technical field of refrigerant recovery. The refrigerant recovery method is applied to a refrigerant recovery device, the refrigerant recovery device comprises a first refrigerant recovery branch, one end of the first refrigerant recovery branch is connected to a recovered unit, the other end of the first refrigerant recovery branch is connected to a recovery container, and a compressor is arranged on the first refrigerant recovery branch. The method comprises the step of controlling the compressor to increase or decrease the operation frequency according to the temperature value of the top shell of the compressor and a first preset temperature value so as to control the temperature of the top shell of the compressor to approach the first preset temperature value. The refrigerant recovery control device and the refrigerant recovery device provided by the invention can execute the refrigerant recovery method. The refrigerant recovery method, the control device and the refrigerant recovery device provided by the invention can solve the technical problem of excessive energy consumption 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 method, a control device and a refrigerant recovery device.
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, only a method of increasing the operation frequency of the compressor is generally adopted, but when the operation frequency of the compressor is increased to a certain value, the recovery efficiency of the refrigerant is not obviously improved, and excessive consumption of energy is caused, resulting in waste of energy.
Disclosure of Invention
The invention solves the technical problem of how to improve the energy over consumption caused by improving the refrigerant recovery efficiency in the prior art.
In order to solve the above problems, the present invention provides a refrigerant recovery method, which is applied to a refrigerant recovery device, wherein the refrigerant recovery device comprises a first refrigerant recovery branch, one end of the first refrigerant recovery branch is connected to a recovered unit, the other end of the first refrigerant recovery branch is connected to a recovery container, and a compressor is arranged on the first refrigerant recovery branch;
the refrigerant recovery method comprises the following steps:
receiving a compressor top shell temperature value, the compressor top shell temperature value representing a temperature of a top shell of the compressor;
and controlling the compressor to increase or decrease the operating frequency according to the compressor top shell temperature value and a first preset temperature value so as to control the top shell temperature of the compressor to approach the first preset temperature value.
Compared with the prior art, the refrigerant recovery method provided by the invention has the beneficial effects that:
in the process of recovering the refrigerant, the top shell temperature of the compressor can influence the recovery rate of the refrigerant, and based on the method, in the refrigerant recovery method, the operation frequency of the compressor is controlled according to the top shell temperature value of the compressor and a first preset temperature value, the top shell temperature of the compressor can be monitored in real time, the top shell temperature of the compressor is adjusted to approach to the first preset temperature value, the rate of recovering the refrigerant is ensured to be kept at a higher rate, the efficiency of recovering the refrigerant is improved, and energy waste caused by the operation frequency of the compressor can be prevented from being blindly promoted. Therefore, the refrigerant recovery method provided by the invention can improve the technical problem of low refrigerant recovery efficiency in the prior art.
Optionally, the step of controlling the compressor to increase or decrease the operating frequency according to the compressor top shell temperature value and the first preset temperature value includes:
acquiring a first threshold value and a second threshold value according to the first preset temperature value, wherein the first threshold value is larger than the second threshold value;
and controlling the compressor to increase or decrease the operating frequency according to the magnitude relation of the compressor top shell temperature value, the first threshold value and the second threshold value.
Optionally, the step of controlling the compressor to increase or decrease the operating frequency according to the magnitude relationship between the compressor top shell temperature value and the first threshold and the second threshold comprises:
if the temperature value of the top shell of the compressor is greater than the first threshold value, controlling the compressor to reduce the operating frequency until the temperature value of the top shell of the compressor is less than or equal to the first preset temperature value;
if the temperature value of the top shell of the compressor is smaller than the second threshold value, controlling the compressor to increase the running frequency until the temperature value of the top shell of the compressor is larger than or equal to the first preset temperature value;
and if the temperature value of the top shell of the compressor is greater than or equal to a second threshold value and the temperature value of the top shell of the compressor is less than or equal to a first threshold value, controlling the compressor to keep the current running frequency to run.
In order to improve the adjustment accuracy of the operating frequency of the compressor, optionally, after the step of controlling the compressor to reduce the operating frequency until the temperature value of the top shell of the compressor is less than or equal to the first preset temperature value, the refrigerant recovery method further includes:
after the reduced operation frequency is used for controlling the compressor to operate for a third preset time, if the temperature value of the top shell of the compressor is smaller than the second threshold value, the step of controlling the compressor to increase the operation frequency is returned to be executed if the temperature value of the top shell of the compressor is smaller than the second threshold value until the temperature value of the top shell of the compressor is larger than or equal to the first preset temperature value;
after the step of controlling the compressor to increase the operating frequency until the temperature value of the top shell of the compressor is greater than or equal to the first preset temperature value, the refrigerant recovery method further comprises the following steps:
and after the fourth running time of the compressor is controlled by the raised running frequency, if the temperature value of the top shell of the compressor is greater than the first threshold value, returning to execute the step of controlling the running frequency of the compressor to be lowered if the temperature value of the top shell of the compressor is greater than the first threshold value until the temperature value of the top shell of the compressor is less than or equal to the first preset temperature value.
In order to prevent the operating frequency of the compressor from frequently fluctuating, optionally, the refrigerant recovery method further comprises:
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 running frequency of the compressor after the running frequency is increased for the next time to control the compressor to run until the refrigerant recovery is finished.
In order to facilitate stable operation of the compressor, optionally, the step of controlling the compressor to reduce the operation frequency comprises:
controlling the running frequency of the compressor to reduce a first preset frequency value every a first 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 second preset time;
wherein the first preset time is less than the second preset time.
Optionally, the step of obtaining the first threshold and the second threshold according to the first preset temperature value includes:
adding a first preset value to the first preset temperature value to obtain a first threshold value;
and subtracting a second preset value from the first preset temperature value to obtain the second threshold value.
Optionally, the refrigerant recovery device further includes a second refrigerant recovery branch and a third refrigerant recovery branch; one end of the second refrigerant recovery branch is connected to the recovered unit, the other end of the second refrigerant recovery branch is connected to the recovery container, and the second refrigerant recovery branch is used for recovering liquid refrigerants; one end of the third refrigerant recovery branch is connected to the second refrigerant recovery branch, and the other end of the third refrigerant recovery branch is connected to the first refrigerant recovery branch, so that liquid refrigerants are guided into the first refrigerant branch to be subjected to gas-liquid mixing recovery;
before the step of receiving the temperature value of the top shell of the compressor, the refrigerant recovery method further comprises the following steps:
receiving a first pressure value and a second pressure value, wherein the first pressure value represents the pressure of the refrigerant in the first refrigerant recovery branch before mixing, and the second pressure value represents the pressure of the refrigerant in the first refrigerant recovery branch after mixing;
and if the difference value between the first pressure value and the second pressure value is smaller than or equal to a preset pressure value, executing the step of receiving the temperature value of the top shell of the compressor.
Optionally, before the step of receiving the temperature value of the top shell of the compressor, the refrigerant recovery method further includes:
judging whether the gaseous refrigerant is recovered or not;
if yes, executing the step of receiving the temperature value of the top shell of the compressor;
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 temperature value of the top shell of the compressor is started until the temperature of the top shell of the compressor reaches a second preset temperature value.
A refrigerant recovery control device is applied to a refrigerant recovery device, the refrigerant recovery device comprises a first refrigerant recovery branch, one end of the first refrigerant recovery branch is connected to a recovered unit, the other end of the first refrigerant recovery branch is connected to a recovery container, and a compressor is arranged on the first refrigerant recovery branch;
the refrigerant recovery control device includes:
a receiving module for receiving a compressor top shell temperature value, the compressor top shell temperature value representing a temperature of a top shell of the compressor;
and the control module is used for controlling the compressor to increase or decrease the operating frequency according to the compressor top shell temperature value and a first preset temperature value so as to control the top shell temperature of the compressor to approach the first preset temperature value.
A refrigerant recovery device comprises a first refrigerant recovery branch, a compressor, a recovery container, a temperature detection device and a controller; one end of the first refrigerant recovery branch is connected to a recovered unit, the other end of the first refrigerant recovery branch is connected to a recovery container, the compressor is arranged on the first refrigerant recovery branch, and the temperature detection device is arranged on a top shell of the compressor to detect the temperature of the top shell of the compressor so as to obtain a temperature value of the top shell of the compressor; the temperature detection device is electrically connected with the controller and is used for sending a compressor top shell temperature value to the controller; the controller is used for executing the refrigerant recovery method.
The refrigerant recovery control device and the refrigerant recovery device provided by the invention can execute the refrigerant recovery method, and the beneficial effects of the refrigerant recovery control device and the refrigerant recovery device relative to the prior art are the same as the beneficial effects of the refrigerant recovery method relative to the prior art, and are not repeated herein.
Drawings
Fig. 1 is a schematic structural diagram of a refrigerant recovery device provided in an embodiment of the present application;
fig. 2 is a flowchart of a refrigerant recovery method provided in the embodiment of the present application;
FIG. 3 is a flowchart of another portion of a common refrigerant recovery method according to an embodiment of the present disclosure;
FIG. 4 is a graph showing a relationship between a top temperature of the compressor and a refrigerant recovery rate;
fig. 5 is a flowchart of step S20 in the refrigerant recovery method according to the embodiment of the present application;
fig. 6 is a flowchart of step S22 in the refrigerant recovery method according to the embodiment of the present application;
fig. 7 is a flowchart of another part of the step S22 in the refrigerant recovery method according to the embodiment of the present application;
fig. 8 is a flowchart of another part of the refrigerant recovery method according to the embodiment of the present application;
fig. 9 is a flowchart of a portion of a refrigerant recovery method provided in the embodiment of the present application;
fig. 10 is a schematic diagram illustrating functional modules of a refrigerant recovery control device according to an embodiment of the present disclosure.
Description of reference numerals:
10-a refrigerant recovery device; 11-a recovered unit; 12-a first refrigerant recovery branch; 121-a compressor; 122-a laval nozzle; 123-heat exchanger; 124-a first solenoid valve; 13-a second refrigerant recovery branch; 131-a second solenoid valve; 14-a third refrigerant recovery branch; 141-a third solenoid valve; 15-nitrogen unit; 16-a recovery vessel; 20-refrigerant recovery control device; 21-a receiving module; 22-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 refrigerant recovery device 10 is used for recovering the refrigerant, in other words, the refrigerant recovery device 10 is used for connecting the unit 11 to be recovered to extract and recover the refrigerant in the unit 11 to be recovered.
As shown in fig. 1, the refrigerant recovery device 10 includes a first refrigerant recovery branch 12 and a second refrigerant recovery branch 13. One end of the first refrigerant recovery branch 12 is connected to the unit 11 to be recovered, and the other end is connected to the recovery container 16. The first refrigerant recovery branch 12 is sequentially provided with a compressor 121, a laval nozzle 122, a heat exchanger 123 and a first electromagnetic valve 124, and in the process of respectively recovering the refrigerants in the recovery unit 11, the refrigerants sequentially pass through the compressor 121, the laval nozzle 122, the heat exchanger 123 and the first electromagnetic valve 124 and are then introduced into the recovery container 16. It should be noted that the first refrigerant recovery branch 12 is generally used for recovering the gaseous refrigerant. Further, one end of the second refrigerant recovery branch 13 is connected to the unit 11 to be recovered, and the other end is connected to the recovery container 16. The second refrigerant recovery branch 13 is provided with a second solenoid valve 131, and the second solenoid valve 131 is used for opening or closing the second refrigerant recovery branch 13. Generally, the second refrigerant recovery branch 13 is used for recovering the liquid refrigerant.
Of course, the refrigerant recovery device 10 may further include a nitrogen device 15, the nitrogen device 15 is used for connecting the recovered unit 11, and the nitrogen device 15 is used for filling nitrogen into the recovered unit 11 to balance the air pressure in the recovered unit 11, so as to facilitate recovery of the gaseous refrigerant and the liquid refrigerant in the recovered unit 11, and improve the recovery efficiency of the refrigerant. It should be understood that the nitrogen gas device 15 may be eliminated in other embodiments of the present application.
In addition, the refrigerant recovery device 10 may further include a third refrigerant recovery branch 14, wherein one end of the third refrigerant recovery branch 14 is connected to the first refrigerant recovery branch 12 and connected between the laval nozzle 122 and the heat exchanger 123; the other end of the third refrigerant recovery branch 14 is connected to the second refrigerant recovery branch 13 and between the unit 11 to be recovered and the second solenoid valve 131. The third refrigerant recovery branch 14 is further provided with a third solenoid valve 141, and the third solenoid valve 141 is used for turning on or off the third refrigerant recovery branch 14.
The refrigerant recovery device 10 performs refrigerant recovery in a manner substantially as follows: the compressor 121 is started to suck the gaseous refrigerant in the recovered unit 11, the compressor 121 performs isentropic compression on the gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant is discharged to enter the laval nozzle 122, the laval nozzle 122 accelerates the refrigerant and then sprays the refrigerant, low pressure is formed at an outlet of the laval nozzle 122, the sprayed gaseous refrigerant enters the heat exchanger 123, the high-temperature and high-pressure gaseous refrigerant is condensed in the heat exchanger 123, and the condensed gaseous refrigerant enters the recovery container 16 to be recovered. Because the laval nozzle 122 forms a low pressure at the outlet of the laval nozzle 122 after the isentropic injection, the nitrogen device 15 is used for filling nitrogen into the recovered unit 11 to pressurize, so that a high-pressure environment is formed in the recovered unit 11, the flow rate of the refrigerant flowing towards the heat exchanger 123 can be increased, the recovery efficiency can be improved, and the quantity of the recovered refrigerant can be increased.
Of course, during the refrigerant recovery process, the second electromagnetic valve 131 may also be opened at the same time to recover the liquid refrigerant through the second refrigerant recovery branch 13; that is, the gaseous refrigerant is recovered by the first refrigerant recovery branch 12, and the liquid refrigerant is recovered by the second refrigerant recovery branch 13, so that the refrigerant recovery efficiency can be improved.
In addition, since a low pressure is formed at the outlet of the laval nozzle 122, the second solenoid valve 131 can be closed and the third solenoid valve 141 can be opened, so that the pipeline for recovering the liquid refrigerant is connected to the branch behind the laval nozzle 122, and thus a pressure difference can be formed between the recovered unit 11 and the third refrigerant recovery branch 14, so that the liquid refrigerant can conveniently enter the third refrigerant recovery branch 14, and the gaseous refrigerant and the liquid refrigerant are mixed in the heat exchanger 123, so as to perform the mixing recovery of the gaseous refrigerant and the liquid refrigerant.
The refrigerant recovery device 10 may further include a pressure detection device, the pressure detection device is disposed on the first refrigerant recovery branch 12, and the pressure detection device is located at an outlet end of the laval nozzle 122, and the pressure detection device is configured to detect a pressure at the outlet end of the laval nozzle 122. The conduction of the third refrigerant recovery branch 14 may be controlled according to the pressure detected by the pressure detection device, for example, when the pressure detection device detects a low pressure, the third solenoid valve 141 is controlled to be opened, and the second solenoid valve 131 is controlled to be closed, so as to conduct the third refrigerant recovery branch 14.
It should be noted that, in general, the liquid refrigerant is recovered at a faster rate, and the liquid refrigerant is volatilized during the recovery process, so that the liquid refrigerant is recovered earlier than the gaseous refrigerant. After that, the pure gaseous refrigerant is recovered.
In the prior art, no matter the recovery to gaseous refrigerant at the anterior segment in-process of refrigerant recovery process, still retrieve pure gaseous refrigerant at the end of recovery process in-process, in order to improve recovery rate, generally promote recovery rate through the mode that improves the operating frequency of compressor, but under the condition that the operating frequency of compressor improves a definite value, it is not obvious to the promotion effect of recovery rate of refrigerant to continue to promote the operating frequency of compressor, not only improved the energy consumption and still not reached the desired effect, the excessive consumption of the energy has been led to.
In order to solve the above problem, that is, in order to solve the technical problem of excessive energy consumption caused by improving the refrigerant recovery efficiency in the prior art, the refrigerant recovery device 10 of the present application is provided.
In the embodiment of the present application, the refrigerant recovery device 10 further includes a temperature detection device and a controller. The temperature detecting device is disposed at the top case of the compressor 121 to detect the top case temperature of the compressor 121 and generate a top case temperature value of the compressor 121. The temperature detection device is also electrically connected with the controller and used for sending the detected and generated temperature value of the top shell of the compressor 121 to the controller, and the controller can control the operating frequency of the compressor 121 according to the temperature value of the top shell of the compressor 121, so that the recovery efficiency of the gaseous refrigerant is improved.
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 manner, the refrigerant recycling device 10 may further include a memory for storing program instructions executable by the controller, for example, the refrigerant recycling control device 20 provided in the embodiment of the present application, and the refrigerant recycling control device 20 provided in the embodiment of the present application includes at least one of the program instructions stored in the memory in a form of software or firmware. 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 device 10 provided above, an embodiment of the present application further provides a refrigerant recovery method to solve the technical problem of excessive energy consumption caused by improving the refrigerant recovery efficiency in the prior art. Referring to fig. 2, the refrigerant recycling method includes:
and step S10, receiving the top shell temperature value of the compressor 121.
The value of the top shell temperature of the compressor 121 indicates the top shell temperature of the compressor 121 in the first refrigerant recovery branch 12. The temperature value of the top shell of the compressor 121 is detected and generated by a temperature detection device arranged on the top shell of the compressor 121, and is sent to the controller by the temperature detection device.
In some embodiments of the present application, referring to fig. 3, before the step S10, the refrigerant recycling method further includes:
and step S05, receiving the first pressure value and the second pressure value.
The first pressure value represents the pressure of the refrigerant before mixing in the first refrigerant recovery branch 12, that is, the pressure of the refrigerant in the first refrigerant recovery branch 12 between the third refrigerant recovery branch 14 and the laval nozzle 122; the second pressure value represents the pressure of the mixed refrigerant in the first refrigerant recovery branch 12, that is, the pressure of the refrigerant in the first refrigerant recovery branch 12 between the third refrigerant recovery branch 14 and the heat exchanger 123. It should be noted that the pressure detection device provided above is used for detecting the pressure at the outlet end of the laval nozzle 122, and may also represent the pressure before the refrigerants in the first refrigerant recovery branch 12 are mixed, that is, may represent the first pressure value. In addition, in the embodiment of the present application, the refrigerant recovery device 10 may further include another pressure detection device, where the pressure detection device is disposed on the first refrigerant recovery branch 12 and located between the third refrigerant recovery branch 14 and the heat exchanger 123, so as to detect a pressure of the mixed refrigerant in the first refrigerant recovery branch 12, that is, a second pressure value; and the pressure detection device is also electrically connected with the controller so as to send the second pressure value to the controller.
Step S06, if the difference between the first pressure value and the second pressure value is less than or equal to the preset pressure value, executing the step of receiving the temperature value of the top shell of the compressor 121.
In other words, when the difference between the first pressure value and the second pressure value satisfies the condition of being less than or equal to the preset pressure value, step S10 may be executed. It should be noted that, when the value of the preset pressure value is small, that is, the first pressure value and the second pressure value are approximately equal, it indicates that the difference between the first pressure value and the second pressure value satisfies the above condition. In this case, it is assumed that only a small amount or no liquid refrigerant in the third refrigerant recovery branch 14 is introduced into the first refrigerant recovery branch 12, and the pure gas refrigerant is recovered in this case.
Optionally, the value of the preset pressure value may be 0.01MPa, and certainly, the range of the preset pressure value may be 0.005MPa to 0.05MPa, in other words, the value of the preset pressure value may also be 0.015MPa, 0.02MPa, 0.025MPa, 0.03MPa, 0.035MPa, 0.04MPa, or 0.045MPa, and the like.
In addition, when the condition of step S06 is satisfied, the third refrigerant recovery branch 14 is controlled to be turned off, and the second refrigerant recovery branch 13 is controlled to be turned on, that is, the third solenoid valve 141 is controlled to be closed and the second solenoid valve 131 is controlled to be opened.
And step S20, controlling the compressor 121 to increase or decrease the operation frequency according to the top shell temperature value and the first preset temperature value of the compressor 121.
It should be noted that, a relationship between the top shell temperature value of the compressor 121 and the recovery speed of the refrigerant is shown in fig. 4, where Ta in the diagram represents a first preset temperature value, so that it can be seen that the recovery speed of the refrigerant reaches the highest value when the top shell temperature of the compressor 121 is the first preset temperature value. The first preset temperature value may be set on the controller when the refrigerant recovery device 10 is manufactured, in other words, the first preset temperature value is a value that is considered to be set.
In addition, in step S20, the purpose of controlling the operation frequency of the compressor 121 to increase or decrease is to adjust the temperature of the top shell of the compressor 121, so that the temperature of the top shell of the compressor 121 can approach the first preset temperature value, in other words, the top shell temperature of the compressor 121 can be monitored in real time to determine whether the refrigerant recovery speed is optimal, and thus the operation frequency of the compressor 121 is controlled to adjust the top shell temperature of the compressor 121, so as to adjust the refrigerant recovery speed to the optimal speed, thereby not only improving the refrigerant recovery efficiency, but also ensuring that energy is not excessively wasted, and further improving the technical problem of excessive energy consumption caused by improving the refrigerant recovery efficiency in the prior art.
Alternatively, the first predetermined temperature value may range from 85 ℃ to 95 ℃, in other words, the first predetermined temperature value may range from 85 ℃, 86 ℃, 87 ℃, 88 ℃, 89 ℃, 90 ℃, 91 ℃, 92 ℃, 93 ℃, 94 ℃ or 95 ℃ and the like. It should be noted that the value of the first preset temperature value may be set according to the displacement of the compressor 121, for example, in the compressor 121 with a displacement of 27.5ML, the first preset temperature value may be set to 90 ℃.
Alternatively, referring to fig. 5, step S20 may include:
step S21, obtaining a first threshold and a second threshold according to the first preset temperature value.
Wherein the first threshold is greater than the second threshold.
The manner of acquiring the first threshold value and the second threshold value in step S21 may be as follows: and subtracting a second preset value from the first preset temperature value to obtain a second threshold value. Wherein the first predetermined value can range from greater than 0 ℃ to less than or equal to 2 ℃, optionally, the first predetermined value can range from 0.1 ℃, 0.2 ℃, 0.3 ℃, 0.4 ℃, 0.5 ℃, 0.6 ℃, 0.7 ℃, 0.8 ℃, 0.9 ℃, 1 ℃, 1.1 ℃, 1.2 ℃, 1.3 ℃, 1.4 ℃, 1.5 ℃, 1.6 ℃, 1.7 ℃, 1.8 ℃ or 1.9 ℃ and the like. In addition, the second predetermined value can range from greater than 0 ℃ to less than or equal to 2 ℃, and optionally, the second predetermined value can range from 0.1 ℃, 0.2 ℃, 0.3 ℃, 0.4 ℃, 0.5 ℃, 0.6 ℃, 0.7 ℃, 0.8 ℃, 0.9 ℃, 1 ℃, 1.1 ℃, 1.2 ℃, 1.3 ℃, 1.4 ℃, 1.5 ℃, 1.6 ℃, 1.7 ℃, 1.8 ℃ or 1.9 ℃ and the like. It should be understood that in some embodiments of the present application, the first preset value and the second preset value may take the same value, and of course, in other embodiments of the present application, the first preset value and the second preset value may also take different values.
And step S22, controlling the compressor 121 to increase or decrease the operation frequency according to the top shell temperature value of the compressor 121 and the size relationship between the first threshold and the second threshold.
Alternatively, referring to fig. 6, step S22 may include:
step S221, if the temperature value of the top shell of the compressor 121 is greater than the first threshold, controlling the compressor 121 to reduce the operating frequency until the temperature value of the top shell of the compressor 121 is less than or equal to a first preset temperature value.
Alternatively, the manner of controlling the compressor 121 to reduce the operating frequency may be as follows: the operating frequency of the compressor 121 is controlled to decrease by a first preset frequency value every a first preset time. In other words, by intermittently decreasing the operating frequency of the compressor 121, the operating frequency is decreased by slowly controlling the compressor 121. In the process of reducing the operating frequency of the compressor 121, the top shell temperature of the compressor 121 cannot be changed immediately as the operating frequency is reduced, and therefore, the operating frequency of the compressor 121 needs to be reduced slowly to prevent the compressor 121 from being excessively adjusted.
Optionally, the value range of the first preset time may be 20s to 30 s; in other words, the value of the first preset time may be 20s, 21s, 22s, 23s, 24s, 25s, 26s, 27s, 28s, 29s, or the like. In addition, the value range of the first preset frequency value may be 1Hz to 3Hz, in other words, the value of the first preset frequency value may be 1Hz, 2Hz, or 3Hz, and the like.
Step S223, if the temperature value of the top shell of the compressor 121 is smaller than the second threshold, controlling the compressor 121 to increase the operating frequency until the temperature value of the top shell of the compressor 121 is greater than or equal to the first preset temperature value.
Alternatively, the manner of controlling the compressor 121 to increase the operating frequency may be as follows: the operating frequency of the compressor 121 is controlled to be increased by a second preset frequency value every second preset time. In other words, by intermittently increasing the operating frequency of the compressor 121, the operating frequency is increased by slowly controlling the compressor 121. In the process of increasing the operating frequency of the compressor 121, the top shell temperature of the compressor 121 cannot be changed immediately along with the increase of the operating frequency, so that the operating frequency of the compressor 121 needs to be increased slowly to prevent the compressor 121 from being excessively adjusted.
Optionally, the value range of the second preset time may be 30s to 40 s; in other words, the second preset time may take 30s, 31s, 32s, 33s, 34s, 35s, 36s, 37s, 38s, 39s, 40s, or the like. In addition, the value range of the second preset frequency value may be 1Hz to 3Hz, in other words, the value of the second preset frequency value may be 1Hz, 2Hz, or 3Hz, and the like. Of course, the first predetermined frequency value and the second predetermined frequency value may be the same value or different values.
Note that, in the case where the operating frequency of the compressor 121 increases, the rate at which the temperature of the compressor 121 increases is V1; in the case where the operating frequency of the compressor 121 is decreased, the rate at which the temperature of the compressor 121 is decreased is V2; generally, V1 is greater than V2, based on which the interval time in the case of the up-conversion control of the compressor 121 needs to be greater than the interval time in the case of the down-conversion control of the compressor 121, i.e., the second preset time is greater than the first preset time. Optionally, the first preset time and the second preset time may be selected and set in the controller after the refrigerant recovery device 10 is manufactured, and certainly, a developer may set the first preset time and the second preset time according to a time when the operation of the compressor 121 reaches a stable state.
Step S225, if the temperature value of the top shell of the compressor 121 is greater than or equal to the second threshold value and the temperature value of the top shell of the compressor 121 is less than or equal to the first threshold value, controlling the compressor 121 to keep the current operating frequency to operate.
It should be noted that, under the condition that the top shell temperature of the compressor 121 is greater than the first threshold, it indicates that the operation frequency of the compressor 121 is too high, which results in the top shell temperature of the compressor 121 being too high, and at this time, not only the recovery rate of the refrigerant is improved less, but also the situation of excessive energy consumption is caused. In addition, when the top shell temperature of the compressor 121 is less than the second threshold, it indicates that the top shell temperature of the compressor 121 is low due to a low operation frequency of the compressor 121 at this time, that is, the recovery rate of the refrigerant has not reached the optimal recovery rate, and therefore, the operation frequency of the compressor 121 may be controlled to be increased to increase the top shell temperature of the compressor 121, thereby increasing the recovery rate of the refrigerant, and ensuring efficient recovery of the refrigerant. Of course, when the top shell temperature of the compressor 121 is less than or equal to the first threshold and greater than or equal to the second threshold, it indicates that the top shell temperature of the compressor 121 is not much different from the first preset temperature value, and based on this, it indicates that the refrigerant recovery speed is not different from the optimal recovery speed, and the energy is not excessively consumed, so the compressor 121 can be controlled to keep operating at the current operating frequency.
In addition, it should be noted that, because there is a certain delay in monitoring the top shell temperature of the compressor 121, the first threshold and the second threshold are obtained according to the first preset temperature value, so that the compressor 121 is controlled to maintain the current frequency when the top shell temperature value of the compressor 121 is between the first threshold and the second threshold, and based on this, it is possible to prevent a monitoring error from causing a false adjustment, thereby avoiding a situation where the frequency of the compressor 121 fluctuates frequently.
In the embodiment of the present application, the order of step S221, step S223, and step S225 is not limited, and the corresponding steps may be executed when any one of the conditions is satisfied.
In some embodiments of the present application, referring to fig. 7, in order to improve the accuracy of adjusting the frequency of the compressor 121, after step S221, the refrigerant recovery method further includes:
step S202, after the compressor 121 is controlled to operate at the reduced operating frequency for the third preset time, if the temperature value of the top shell of the compressor 121 is smaller than the second threshold, the step of controlling the compressor 121 to increase the operating frequency until the temperature value of the top shell of the compressor 121 is greater than or equal to the first preset temperature value is executed again if the temperature value of the top shell of the compressor 121 is smaller than the second threshold.
In other words, after the frequency reduction operation is performed on the compressor 121 in step S221, the operation of the compressor 121 is controlled according to the operation frequency after the frequency reduction, and when the operation time reaches a third preset time, it is determined whether the temperature value of the top shell of the compressor 121 is smaller than the second threshold, and if the temperature value of the top shell of the compressor 121 is smaller than the second threshold, it indicates that the temperature of the compressor 121 is excessively adjusted, so that it is necessary to return to step S223 again to adjust the temperature of the top shell of the compressor 121, so as to adjust the recovery speed of the refrigerant.
It should be noted that, the detection of the temperature value of the top shell of the compressor 121 is performed after the compressor 121 is operated for the third preset time, so as to ensure that the compressor 121 is operated for a long enough time, so that the state of the compressor 121 is stable, thereby improving the accuracy of determining the state of the compressor 121, and preventing the misadjustment of the operating frequency of the compressor 121 caused by the misdetermination.
Optionally, the value range of the third preset time may be 1min to 3 min; in other words, the value of the third preset time may be 1.5min, 2min, 2.5min, 3min, or the like.
Similarly, after step S223, the refrigerant recovery method further includes:
step S204, after the raised operating frequency is used to control the compressor 121 to operate for the fourth preset time, if the temperature of the top shell of the compressor 121 is greater than the first threshold, the step of returning to execute the step of controlling the compressor 121 to reduce the operating frequency if the temperature value of the top shell of the compressor 121 is greater than the first threshold until the temperature value of the top shell of the compressor 121 is less than or equal to the first preset temperature value is executed.
In other words, after the frequency-up operation is performed on the compressor 121 in step S223, the operation of the compressor 121 is controlled according to the operation frequency after the frequency-up operation, and when the operation time reaches the fourth preset time, it is determined whether the top shell temperature value of the compressor 121 is greater than the first threshold, and if the top shell temperature value of the compressor 121 is greater than the first threshold, it indicates that the temperature of the compressor 121 is excessively adjusted, so that the step S221 needs to be performed again to adjust the top shell temperature of the compressor 121, so as to adjust the recovery speed of the refrigerant.
In a similar way, the compressor 121 is allowed to operate for the fourth preset time and then the top shell temperature value of the compressor 121 is detected, so as to ensure that the compressor 121 operates for a long enough time, so that the state of the compressor 121 is stable, the accuracy of judging the state of the compressor 121 can be improved, and misadjustment of the operating frequency of the compressor 121 due to misjudgment is prevented.
Optionally, the value range of the fourth preset time may be 1min to 3 min; in other words, the value of the fourth preset time may be 1.5min, 2min, 2.5min, 3min, or the like. In addition, in some embodiments of the present application, values of the third preset time and the fourth preset time may be the same, and certainly, the value of the third preset time and the value of the fourth preset time may also be different.
In order to prevent the operation frequency of the compressor 121 from repeatedly rising and falling, so as to avoid frequent fluctuation of the operation frequency of the compressor 121, referring to fig. 8, in some embodiments of the present application, the refrigerant recovery method further includes:
step S310, when the compressor 121 is continuously controlled to increase the operation frequency and decrease the operation frequency, counting is performed in sequence.
In other words, after the operating frequency of the compressor 121 is down-converted in step S221, if the top shell temperature of the compressor 121 is lower than the second threshold, the step of up-converting the operating frequency of the compressor 121 in step S223 is performed again, and after the step of up-converting is completed, counting is performed once; in other words, when one down-conversion control and one up-conversion control are completed, one count is performed.
Step S320, when the count reaches the preset number, controlling the compressor 121 to operate at the operation frequency after the operation frequency of the compressor 121 is increased for the next time until the refrigerant recovery is completed.
When the count reaches the preset number of times in step S310, it indicates that the refrigerant recovery device 10 has performed the repeated control of the frequency increase and frequency decrease a plurality of times, indicating that the top case temperature of the compressor 121 is difficult to adjust between the first threshold value and the second threshold value, and based on this, in order to prevent the repeated frequency increase and frequency decrease of the frequency of the compressor 121, the operation frequency after the next frequency increase control is controlled to operate the compressor 121. Of course, in other embodiments of the present application, the operation frequency after the frequency reduction control may be changed once to control the operation of the compressor 121 until the recovery of the refrigerant is completed.
In other words, in some embodiments of the present application, after the compressor 121 repeatedly performs the frequency-up control and the frequency-down control, the controller continues to control the compressor 121 to perform the frequency-down control in step S221 or the frequency-up control in step S223, and controls the compressor 121 to operate at the operating frequency obtained after the frequency-up control in step S223 until the refrigerant is recovered.
It is worth to be noted that, compared with the method that the operation frequency obtained after the down-conversion control is used for controlling the compressor 121 to operate until the refrigerant is recovered, and the operation frequency obtained after the up-conversion control is used for controlling the compressor 121 to operate until the refrigerant is recovered, the temperature of the top shell of the compressor 121 is higher, so that the refrigerant recovery speed is higher, the refrigerant can be rapidly recovered, the recovery efficiency is improved, and the energy consumption is also saved to a certain extent.
In addition, referring to fig. 9, in some embodiments of the present application, before the step S10, the refrigerant recycling method may further include:
step S01, it is determined whether or not the gaseous refrigerant has been collected.
Step S02, if yes, executing the step of receiving the temperature value of the top shell of the compressor 121.
In other words, if the gaseous refrigerant is already recovered, the process may proceed to step S10.
In general, the recovery unit 11 contains both the gaseous refrigerant and the liquid refrigerant, and thus recovers both the gaseous refrigerant and the liquid refrigerant to improve the recovery efficiency. After the recovery process is performed for a period of time, the liquid refrigerant is recovered, and the gaseous refrigerant remains, so that if the determination result in step S01 is yes, it indicates that the gaseous refrigerant has been recovered before, and at this time, the step of receiving the top shell temperature value of the compressor 121 may be directly performed.
Step S03, if not, the compressor 121 is controlled to be started, and the operating frequency of the compressor 121 is controlled to increase by a third preset frequency value every fifth preset time, until the top shell temperature of the compressor 121 reaches the second preset temperature value, the step of receiving the top shell temperature value of the compressor 121 is started.
In other words, if the recycling of the gaseous refrigerant is not performed before, for example, under the condition that only the gaseous refrigerant exists in the recycled unit 11 or the recycling of the liquid refrigerant is inconvenient, the refrigerant recycling method provided by the present application may be performed, so that the operation frequency of the compressor 121 needs to be controlled to be increased enough to enable the top shell temperature of the compressor 121 to reach the third preset temperature value, in other words, the speed of recycling the refrigerant is directly increased to be close to the optimal recycling speed, so that the refrigerant can be rapidly recycled while the operation frequency of the compressor 121 is controlled to be adjusted, thereby improving the overall recycling efficiency.
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 control the operating frequency of the compressor 121 in step S10.
To sum up, the refrigerant recovery method and the refrigerant recovery apparatus 10 provided in the present application, in the process of recovering the refrigerant, the top shell temperature of the compressor 121 may affect the recovery rate of the refrigerant, based on this, in the refrigerant recovery method, the operation frequency is controlled by the top shell temperature value of the compressor 121 and the first preset temperature value, the top shell temperature of the compressor 121 may be monitored in real time, so as to adjust the top shell temperature of the compressor 121 to approach to the first preset temperature value, ensure that the rate of recovering the refrigerant is maintained at a higher rate, thereby improve the efficiency of recovering the refrigerant, and also prevent the energy waste caused by blindly increasing the operation frequency of the compressor 121. Therefore, the refrigerant recovery method provided by the invention can improve the technical problem of low refrigerant recovery efficiency in the prior art.
In order to execute possible steps of the refrigerant recovery method provided in the foregoing embodiments, please refer to fig. 10, and fig. 10 shows a functional module schematic diagram of a refrigerant recovery control device 20 provided in the embodiment of the present application. The refrigerant recovery control device 20 is applied to refrigerant recovery decoration to execute the provided refrigerant recovery 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 receiving module 21 and a control module 22.
The receiving module 21 is configured to receive a top shell temperature value of the compressor 121, where the top shell temperature value of the compressor 121 represents a top shell temperature of the compressor 121. In addition, the receiving module 21 is further configured to receive a first pressure value and a second pressure value, where the first pressure value represents a pressure before the refrigerant is mixed in the first refrigerant recovery branch 12, and the second pressure value represents a pressure after the refrigerant is mixed in the first refrigerant recovery branch 12.
Optionally, the receiving module 21 may be specifically configured to execute step S10 and step S05 in the above-mentioned figures, so as to achieve the corresponding technical effect.
The control module 22 is configured to control the compressor 121 to increase or decrease the operating frequency according to the top shell temperature value of the compressor 121 and the first preset temperature value, so as to adjust the top shell temperature of the compressor 121 to approach the first preset temperature value.
Optionally, the receiving module 21 may be specifically configured to execute step S20 and its sub-steps in the above-mentioned figures, so as to achieve the corresponding technical effect.
The control module 22 may also be used to perform steps S01 and S02 in the various figures described above to achieve 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 (11)
1. A refrigerant recovery method is applied to a refrigerant recovery device and is characterized in that the refrigerant recovery device comprises a first refrigerant recovery branch, one end of the first refrigerant recovery branch is connected to a recovered unit, the other end of the first refrigerant recovery branch is connected to a recovery container, a compressor is arranged on the first refrigerant recovery branch, and the first refrigerant recovery branch is used for recovering gaseous refrigerants;
the refrigerant recovery method comprises the following steps:
receiving a compressor top shell temperature value, the compressor top shell temperature value representing a temperature of a top shell of the compressor;
and controlling the compressor to increase or decrease the operating frequency according to the compressor top shell temperature value and a first preset temperature value so as to control the top shell temperature of the compressor to approach the first preset temperature value.
2. The refrigerant recovery method according to claim 1, wherein the step of controlling the compressor to increase or decrease the operating frequency according to the compressor top shell temperature value and a first preset temperature value comprises: acquiring a first threshold value and a second threshold value according to the first preset temperature value, wherein the first threshold value is larger than the second threshold value;
and controlling the compressor to increase or decrease the operating frequency according to the magnitude relation of the compressor top shell temperature value, the first threshold value and the second threshold value.
3. The refrigerant recovery method according to claim 2, wherein the step of controlling the compressor to increase or decrease the operating frequency according to the relationship among the compressor top shell temperature value, the first threshold value and the second threshold value comprises:
if the temperature value of the top shell of the compressor is greater than the first threshold value, controlling the compressor to reduce the operating frequency until the temperature value of the top shell of the compressor is less than or equal to the first preset temperature value;
if the temperature value of the top shell of the compressor is smaller than the second threshold value, controlling the compressor to increase the running frequency until the temperature value of the top shell of the compressor is larger than or equal to the first preset temperature value;
and if the temperature value of the top shell of the compressor is greater than or equal to a second threshold value and the temperature value of the top shell of the compressor is less than or equal to a first threshold value, controlling the compressor to keep the current running frequency to run.
4. The refrigerant recovery method according to claim 3, wherein after the step of controlling the compressor to reduce the operating frequency until the temperature value of the top shell of the compressor is less than or equal to the first preset temperature value, the refrigerant recovery method further comprises:
after the reduced operation frequency is used for controlling the compressor to operate for a third preset time, if the temperature value of the top shell of the compressor is smaller than the second threshold value, the step of controlling the compressor to increase the operation frequency is returned to be executed if the temperature value of the top shell of the compressor is smaller than the second threshold value until the temperature value of the top shell of the compressor is larger than or equal to the first preset temperature value;
after the step of controlling the compressor to increase the operating frequency until the temperature value of the top shell of the compressor is greater than or equal to the first preset temperature value, the refrigerant recovery method further comprises the following steps:
and after the fourth running time of the compressor is controlled by the raised running frequency, if the temperature value of the top shell of the compressor is greater than the first threshold value, returning to execute the step of controlling the running frequency of the compressor to be lowered if the temperature value of the top shell of the compressor is greater than the first threshold value until the temperature value of the top shell of the compressor is less than or equal to the first preset temperature value.
5. The refrigerant recovery 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 running frequency of the compressor after the running frequency is increased for the next time to control the compressor to run until the refrigerant recovery is finished.
6. The refrigerant recovery method according to claim 3, wherein 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 first 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 second preset time;
wherein the first preset time is less than the second preset time.
7. The refrigerant recovery method according to claim 2, wherein the step of obtaining the first threshold value and the second threshold value according to the first preset temperature value includes:
adding a first preset value to the first preset temperature value to obtain a first threshold value;
and subtracting a second preset value from the first preset temperature value to obtain the second threshold value.
8. The refrigerant recovery method according to any one of claims 1 to 7, wherein the refrigerant recovery apparatus further includes a second refrigerant recovery branch and a third refrigerant recovery branch; one end of the second refrigerant recovery branch is connected to the recovered unit, the other end of the second refrigerant recovery branch is connected to the recovery container, and the second refrigerant recovery branch is used for recovering liquid refrigerants; one end of the third refrigerant recovery branch is connected to the second refrigerant recovery branch, and the other end of the third refrigerant recovery branch is connected to the first refrigerant recovery branch, so that liquid refrigerants are guided into the first refrigerant branch to be subjected to gas-liquid mixing recovery;
before the step of receiving the temperature value of the top shell of the compressor, the refrigerant recovery method further comprises the following steps:
receiving a first pressure value and a second pressure value, wherein the first pressure value represents the pressure of the refrigerant in the first refrigerant recovery branch before mixing, and the second pressure value represents the pressure of the refrigerant in the first refrigerant recovery branch after mixing;
and if the difference value between the first pressure value and the second pressure value is smaller than or equal to a preset pressure value, executing the step of receiving the temperature value of the top shell of the compressor.
9. The refrigerant recovery method according to any one of claims 1 to 7, further comprising, before the step of receiving a compressor top shell temperature value:
judging whether the gaseous refrigerant is recovered or not;
if yes, executing the step of receiving the temperature value of the top shell of the compressor;
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 temperature value of the top shell of the compressor is started until the temperature of the top shell of the compressor reaches a second preset temperature value.
10. A refrigerant recovery control device is applied to a refrigerant recovery device and is characterized by comprising a first refrigerant recovery branch, wherein one end of the first refrigerant recovery branch is connected to a unit to be recovered, the other end of the first refrigerant recovery branch is connected to a recovery container, and a compressor is arranged on the first refrigerant recovery branch;
the refrigerant recovery control device includes:
a receiving module for receiving a compressor top shell temperature value, the compressor top shell temperature value representing a temperature of a top shell of the compressor;
and the control module is used for controlling the compressor to increase or decrease the operating frequency according to the compressor top shell temperature value and a first preset temperature value so as to control the top shell temperature of the compressor to approach the first preset temperature value.
11. The refrigerant recovery device is characterized by comprising a first refrigerant recovery branch, a compressor, a recovery container, a temperature detection device and a controller; one end of the first refrigerant recovery branch is connected to a recovered unit, the other end of the first refrigerant recovery branch is connected to a recovery container, the compressor is arranged on the first refrigerant recovery branch, and the temperature detection device is arranged on a top shell of the compressor to detect the temperature of the top shell of the compressor so as to obtain a temperature value of the top shell of the compressor; the temperature detection device is electrically connected with the controller and is used for sending a compressor top shell temperature value to the controller; the controller is configured to perform the refrigerant recovery method according to any one of claims 1 to 9.
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