CN114234501B - 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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- CN114234501B CN114234501B CN202111571924.3A CN202111571924A CN114234501B CN 114234501 B CN114234501 B CN 114234501B CN 202111571924 A CN202111571924 A CN 202111571924A CN 114234501 B CN114234501 B CN 114234501B
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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 includes controlling the compressor to increase or decrease the operating frequency according to the top shell temperature value and the first preset temperature value to control the top shell temperature 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 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
Besides the insufficient environmental awareness of operators, the refrigerant recovery device has an important reason that various defects such as low recovery speed and efficiency exist in the practical application process of many refrigerant recovery devices at present, but the recovery device with relatively high recovery speed has the problems of relatively large volume, inconvenient transportation and carrying and the like, but some of the recovery devices with small volume and relatively slow recovery speed of portable devices.
In the prior art, in order to improve the recovery efficiency of the refrigerant, only a method for improving the operation frequency of the compressor is generally adopted, but under the condition that the operation frequency of the compressor is improved to a certain value, the recovery efficiency of the refrigerant is not obviously improved, but excessive consumption of energy is caused, and the energy is wasted.
Disclosure of Invention
The invention solves the technical problem of excessive energy consumption caused by improving the refrigerant recovery efficiency in the prior art.
In order to solve the problems, the 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 with a recovered unit, the other end of the first refrigerant recovery branch is connected with 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 top shell temperature value of the compressor 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 refrigerant recovery method, the top shell temperature of the compressor can influence the recovery rate of the refrigerant, and based on the refrigerant recovery method, the top shell temperature of the compressor can be monitored in real time by controlling the compressor to adjust the operation frequency according to the top shell temperature value of the compressor and the first preset temperature value so as to adjust the top shell temperature of the compressor to be close to the first preset temperature value, the refrigerant recovery rate is ensured to be kept at a higher rate, the refrigerant recovery efficiency is improved, and energy waste caused by blindly improving the operation frequency of the compressor can be prevented. Therefore, the refrigerant recovery method provided by the invention can solve 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 and a second threshold according to the first preset temperature value, wherein the first threshold is larger than the second threshold;
and controlling the compressor to increase or decrease the operating frequency according to the magnitude relation among the top shell temperature value of the compressor, 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 relation of 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 larger than the first threshold value, controlling the compressor to reduce the running frequency until the temperature value of the top shell of the compressor is smaller 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 operating 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 larger than or equal to the second threshold value and the temperature value of the top shell of the compressor is smaller than or equal to the first threshold value, controlling the compressor to keep the current running frequency to run.
In order to improve the accuracy of adjusting 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 controlling the compressor to run for a third preset time with the reduced running frequency, if the temperature value of the top shell of the compressor is smaller than the second threshold value, returning to execute the step of controlling the compressor to raise 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 if the temperature value of the top shell of the compressor is smaller than the second threshold value;
after the step of controlling the compressor to raise 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 includes:
and after the compressor is controlled to run for a fourth running time according to the increased running frequency, if the temperature value of the top shell of the compressor is larger than the first threshold value, returning to the step of controlling the compressor to reduce the running frequency until the temperature value of the top shell of the compressor is smaller than or equal to the first preset temperature value if the temperature value of the top shell of the compressor is larger than the first threshold value.
In order to prevent frequent fluctuation of the operation frequency of the compressor, optionally, the refrigerant recovery method further includes:
counting once while continuously controlling the compressor to raise and lower an operating frequency;
when the count reaches the preset times, the operation frequency after the operation frequency of the compressor is controlled to be increased next time is used for controlling the operation of the compressor until the refrigerant recovery is completed.
In order to facilitate stable operation of the compressor, optionally, the step of controlling the compressor to reduce the operating frequency includes:
controlling the operation frequency of the compressor to reduce a first preset frequency value at intervals of a first preset time;
the step of controlling the compressor to raise the operating frequency includes:
controlling the operation frequency of the compressor to rise 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 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 the first threshold value;
subtracting a second preset value from the first preset temperature value to obtain the second threshold value.
Optionally, the refrigerant recovery device further comprises 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 refrigerant; 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 the liquid refrigerant is led into the first refrigerant branch for gas-liquid mixed recovery;
the refrigerant recovery method further includes, prior to the step of receiving the compressor top shell temperature value:
receiving a first pressure value and a second pressure value, wherein the first pressure value represents the pressure before the refrigerant in the first refrigerant recovery branch is mixed, and the second pressure value represents the pressure after the refrigerant in the first refrigerant recovery branch is mixed;
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 comprises:
judging whether recovery of the gaseous refrigerant is performed;
If yes, executing the step of receiving the temperature value of the top shell of the compressor;
if not, controlling the compressor to be started, and controlling the running frequency of the compressor to be increased by a third preset frequency value every fifth preset time until the top shell temperature of the compressor reaches a second preset temperature value, and starting to execute the step of receiving the top shell temperature value of the compressor.
The refrigerant recovery control device is applied to a refrigerant recovery device, and comprises a first refrigerant recovery branch, wherein one end of the first refrigerant recovery branch is connected with a recovered unit, the other end of the first refrigerant recovery branch is connected with 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 running frequency according to the top shell temperature value of the compressor and a first preset temperature value so as to control the top shell temperature of the compressor to approach the first preset temperature value.
The 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 the recovered unit, the other end of the first refrigerant recovery branch is connected to the recovery container, the compressor is arranged on the first refrigerant recovery branch, and the temperature detection device is arranged on the top shell of the compressor to detect the temperature of the top shell of the compressor so as to obtain the 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 temperature value of the top shell of the compressor 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 application 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 those of the refrigerant recovery method provided by the application relative to the prior art, and are not repeated here.
Drawings
Fig. 1 is a schematic structural diagram of a refrigerant recovery device according to an embodiment of the present application;
FIG. 2 is a flow chart of a refrigerant recovery method according to an embodiment of the present application;
FIG. 3 is a flow chart of another part of the refrigerant recovery method according to the embodiment of the application;
FIG. 4 is a graph of the relationship between the top temperature of the compressor and the refrigerant recovery rate;
FIG. 5 is a flowchart of step S20 in the refrigerant recycling 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 recycling method according to the embodiment of the present application;
FIG. 8 is a flow chart of a further part of the refrigerant recovery method according to the embodiment of the application;
FIG. 9 is a flow chart of a further part of the refrigerant recovery method according to the embodiment of the present application;
Fig. 10 is a schematic functional block diagram of a refrigerant recovery control device according to an embodiment of the present application.
Reference numerals illustrate:
10-refrigerant recovery device; 11-recovered units; 12-a first refrigerant recovery branch; 121-a compressor; 122-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 device; 16-a recovery vessel; 20-refrigerant recovery control device; a 21-receiving module; 22-control module.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
The refrigerant recovery device 10 is used for recovering the refrigerant, in other words, the refrigerant recovery device 10 is connected to the recovered unit 11 to extract and recover the refrigerant in the recovered unit 11.
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 recovered unit 11, and the other end is connected to the recovery container 16. The first refrigerant recovery branch 12 is provided with a compressor 121, a laval nozzle 122, a heat exchanger 123 and a first electromagnetic valve 124 in order, and in the process of separately recovering the refrigerant in the recovery unit 11, the refrigerant passes through the compressor 121, the laval nozzle 122, the heat exchanger 123 and the first electromagnetic valve 124 in order and is then led into the recovery container 16. It should be noted that the first refrigerant recovery branch 12 is generally used for recovering the refrigerant in the gaseous state. The second refrigerant recovery branch 13 has one end connected to the recovery unit 11 and the other end connected to the recovery container 16. The second refrigerant recovery branch 13 is provided with a second electromagnetic valve 131, and the second electromagnetic valve 131 is used for opening or closing the second refrigerant recovery branch 13. In general, 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, where the nitrogen device 15 is used to connect the recovered unit 11, and the nitrogen device 15 is used to charge 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, thereby improving the recovery efficiency of the refrigerant. It should be understood that in other embodiments of the present application, the nitrogen device 15 may be eliminated.
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 is 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 is connected between the recovered unit 11 and the second solenoid valve 131. The third refrigerant recovery branch 14 is further provided with a third electromagnetic valve 141, and the third electromagnetic valve 141 is used for switching on or switching off the third refrigerant recovery branch 14.
The refrigerant recovery device 10 performs refrigerant recovery in the following manner: the compressor 121 is turned on to suck the gaseous refrigerant in the recovered unit 11, the compressor 121 isentropically compresses the gaseous refrigerant, the gaseous refrigerant with high temperature and high pressure 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 the outlet of the Laval nozzle 122, the sprayed gaseous refrigerant enters the heat exchanger 123, the gaseous refrigerant with high temperature and high pressure 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 low pressure at the outlet of the Laval nozzle 122 after isentropic injection, nitrogen is filled into the recovered unit 11 through the nitrogen device 15 to boost pressure, thereby forming a high-pressure environment in the recovered unit 11, the flow rate of the refrigerant towards the heat exchanger 123 can be improved, the recovery efficiency can be improved, and the amount of the recovered refrigerant can be improved.
Of course, in the process of refrigerant recovery, the second electromagnetic valve 131 may be opened simultaneously to recover the liquid refrigerant through the second refrigerant recovery branch 13; that is, the refrigerant recovery efficiency can be improved by recovering the liquid refrigerant by the second refrigerant recovery branch 13 while recovering the gaseous refrigerant by the first refrigerant recovery branch 12.
In addition, since the outlet of the laval nozzle 122 forms a low pressure, the second electromagnetic valve 131 can be closed and the third electromagnetic valve 141 can be opened, so that the pipeline for recovering the liquid refrigerant is connected to the branch behind the laval nozzle 122, a pressure difference can be formed between the recovered unit 11 and the third refrigerant recovery branch 14, 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 for mixed recovery of the gaseous refrigerant and the liquid refrigerant.
The refrigerant recovery device 10 may further include a pressure detecting device disposed on the first refrigerant recovery branch 12 and located at the outlet end of the laval nozzle 122, and configured to detect the pressure at the outlet end of the laval nozzle 122. The third refrigerant recovery branch 14 may be controlled according to the pressure detected by the pressure detecting device, for example, when the pressure detecting 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 that the third refrigerant recovery branch 14 is turned on.
It should be noted that, in general, the liquid refrigerant recovery rate is faster, and in the process of refrigerant recovery, the liquid refrigerant volatilizes, so that the liquid refrigerant is recovered in advance compared with the gaseous refrigerant. After that, the pure gaseous refrigerant is recovered.
In the prior art, no matter the gaseous refrigerant is recovered in the front stage process of the refrigerant recovery process or the pure gaseous refrigerant is recovered in the end stage process of the recovery process, in order to improve the recovery rate, the recovery rate is generally improved by improving the operation frequency of the compressor, but under the condition that the operation frequency of the compressor is improved to a certain value, the improvement effect of the operation frequency of the compressor on the recovery rate of the refrigerant is not obvious, the energy consumption is not improved yet, and the excessive consumption of energy is caused.
In order to solve the above-mentioned problems, that is, 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 provided at the top shell of the compressor 121 to detect the top shell temperature of the compressor 121 and generate a top shell temperature value of the compressor 121. The temperature detecting device is further electrically connected to the controller, so as to send the detected top shell temperature value of the compressor 121 to the controller, and the controller can control the operation frequency of the compressor 121 according to the top shell temperature value of the compressor 121, thereby improving the recovery efficiency of the gaseous refrigerant.
The controller may be an integrated circuit chip with signal processing capabilities. The controller may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a single-chip microcomputer, a micro-control unit (Microcontroller Unit, MCU), a complex programmable logic device (Complex Programmable Logic Device, CPLD), a Field-programmable gate array (Field-Programmable Gate Array, FPGA), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an embedded ARM, or other chips, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present application.
In a possible embodiment, the refrigerant recovery device 10 may further include a memory, where the memory is used to store program instructions that can be executed by the controller, for example, the refrigerant recovery control device 20 provided in the embodiment of the present application, where the refrigerant recovery control device 20 provided in the embodiment of the present application includes at least one of the refrigerant recovery control device and the refrigerant recovery control device may be 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 (Random Access Memory, RAM), read Only Memory (ROM), programmable Read Only Memory (Programmable Read-Only Memory, PROM), erasable Read Only Memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable Read Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM). The memory may also be provided integrally with the controller, e.g. the memory may be provided integrally with the controller in the same chip.
Based on the above-mentioned refrigerant recovery device 10, the embodiment of the 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 recovery method includes:
step S10, receiving a top shell temperature value of the compressor 121.
Wherein the top shell temperature value of the compressor 121 represents the top shell temperature of the compressor 121 on the first refrigerant recovery branch 12. The temperature value of the top shell of the compressor 121 is detected and generated by a temperature detecting device arranged on the top shell of the compressor 121, and is sent to a controller by the temperature detecting device.
In some embodiments of the present application, referring to fig. 3, before step S10, the refrigerant recovery method further includes:
step S05, receiving a first pressure value and a second pressure value.
Wherein the first pressure value represents the pressure before the mixing of the 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 laval nozzle 122; the second pressure value represents the pressure of the first refrigerant recovery branch 12 after the refrigerant is mixed, 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 detecting device provided above is used for detecting the pressure at the outlet end of the laval nozzle 122, and may also indicate the pressure on the first refrigerant recovery branch 12 before the refrigerant is mixed, i.e. may indicate 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, which is disposed on the first refrigerant recovery branch 12 and located between the third refrigerant recovery branch 14 and the heat exchanger 123, for detecting the pressure after the refrigerant is mixed in the first refrigerant recovery branch 12, that is, the second pressure value; and the pressure detection device is also electrically connected to the controller 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, a step of receiving the top shell temperature value of the compressor 121 is performed.
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 performed. It should be noted that, when the preset pressure value is smaller, that is, the first pressure value and the second pressure value are approximately equal, the difference value between the first pressure value and the second pressure value satisfies the above condition. At this time, it is assumed that only a small amount or no liquid refrigerant is introduced into the first refrigerant recovery branch circuit 12 in the third refrigerant recovery branch circuit 14, and the recovery of the pure gaseous refrigerant is performed at this time.
Alternatively, the preset pressure value may be 0.01MPa, and of course, the preset pressure value may be in the range of 0.005MPa to 0.05MPa, in other words, the preset pressure value may be 0.015MPa, 0.02MPa, 0.025MPa, 0.03MPa, 0.035MPa, 0.04MPa, 0.045MPa, or the like.
In addition, in the case where the condition of step S06 is satisfied, the third refrigerant recovery branch 14 is controlled to be opened, and the second refrigerant recovery branch 13 is controlled to be opened, in other words, the third solenoid valve 141 is controlled to be closed, and the second solenoid valve 131 is controlled to be opened.
Step S20, controlling 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.
It should be noted that, the relationship between the top shell temperature value of the compressor 121 and the recovery speed of the refrigerant is shown in fig. 4, in which Ta represents the first preset temperature value, so that it can be seen that the recovery speed of the refrigerant is highest 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 considered to be a set value.
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 to 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, so that the operation frequency of the compressor 121 is controlled to adjust the top shell temperature of the compressor 121, thereby realizing the adjustment of the refrigerant recovery speed to the optimal, improving the refrigerant recovery efficiency, ensuring that energy is not excessively wasted, and further improving the technical problem of excessive energy consumption caused by the improvement of the refrigerant recovery efficiency in the prior art.
Alternatively, the value of the first preset temperature value may be in the range of 85 ℃ to 95 ℃, in other words, the value of the first preset temperature value may be 85 ℃, 86 ℃, 87 ℃, 88 ℃, 89 ℃, 90 ℃, 91 ℃, 92 ℃, 93 ℃, 94 ℃, 95 ℃, or 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 the displacement of 27.5ML, the first preset temperature value may be set to 90 ℃.
Optionally, referring to fig. 5, step S20 may include:
step S21, a first threshold value and a second threshold value are obtained according to a 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: the first preset temperature value is added with the first preset value to obtain a first threshold value, and the second preset value is subtracted from the first preset temperature value to obtain a second threshold value. Wherein the range of the first preset value may be greater than 0 ℃ and less than or equal to 2 ℃, alternatively, the value of the first preset value may be 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 ℃, 1.9 ℃, or the like. In addition, the range of values of the second preset value may be greater than 0 ℃ and less than or equal to 2 ℃, alternatively, the value of the second preset value may be 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 ℃, 1.9 ℃, or 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 take different values.
Step S22, controlling the compressor 121 to increase or decrease the operation frequency according to the magnitude relation among the top shell temperature value of the compressor 121, the first threshold value and the second threshold value.
Optionally, referring to fig. 6, step S22 may include:
in step S221, if the top shell temperature value of the compressor 121 is greater than the first threshold value, the compressor 121 is controlled to reduce the operating frequency until the top shell temperature value of the compressor 121 is less than or equal to the first preset temperature value.
Alternatively, the manner in which the compressor 121 is controlled to reduce the operating frequency may be as follows: the operating frequency of the compressor 121 is controlled to be reduced by a first preset frequency value every first preset time. In other words, the operating frequency of the compressor 121 is controlled to be lowered slowly by intermittently lowering the operating frequency of the compressor 121. Among them, since the top shell temperature of the compressor 121 cannot be changed immediately with the decrease of the operation frequency in the course of decreasing the operation frequency of the compressor 121, it is necessary to slowly decrease the operation frequency of the compressor 121 to prevent the compressor 121 from being excessively adjusted.
Optionally, the value range of the first preset time may be 20s-30s; 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-3Hz, in other words, the value of the first preset frequency value may be 1Hz, 2Hz, 3Hz, or the like.
In step S223, if the top shell temperature value of the compressor 121 is less than the second threshold value, the compressor 121 is controlled to raise the operating frequency until the top shell temperature value of the compressor 121 is greater than or equal to the first preset temperature value.
Alternatively, the manner in which the compressor 121 is controlled to raise 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, the operating frequency of the compressor 121 is increased by intermittently increasing the operating frequency of the compressor 121 to slowly control the compressor 121. Among them, since the top shell temperature of the compressor 121 cannot be changed immediately with the increase of the operation frequency in the process of increasing the operation frequency of the compressor 121, it is necessary to increase the operation frequency of the compressor 121 slowly to prevent the compressor 121 from being excessively adjusted.
Optionally, the value range of the second preset time may be 30s-40s; in other words, the second preset time may have a value of 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-3Hz, in other words, the value of the second preset frequency value may be 1Hz, 2Hz, 3Hz, or the like. Of course, the first preset frequency value and the second preset frequency value may take the same value, or may take different values.
In the case where the operation 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 lowered, V2 is a rate at which the temperature of the compressor 121 is lowered; in general, V1 is greater than V2, based on which the interval time in the case of the frequency-up control of the compressor 121 needs to be greater than the interval time in the case of the frequency-down control of the compressor 121, i.e., the second preset time is greater than the first preset time. Alternatively, the selection of the first preset time and the second preset time may be set in the controller after the refrigerant recovery device 10 is manufactured, and of course, a developer may set the first preset time and the second preset time according to the time when the operation of the compressor 121 reaches a stable state.
In step S225, if the top shell temperature value of the compressor 121 is greater than or equal to the second threshold value and the top shell temperature value of the compressor 121 is less than or equal to the first threshold value, the compressor 121 is controlled to keep the current operating frequency.
It should be noted that, when the top shell temperature of the compressor 121 is greater than the first threshold, it means that the operation frequency of the compressor 121 is too high, which results in that the top shell temperature of the compressor 121 is too high, at this time, the recovery rate of the refrigerant is improved less, and meanwhile, the situation of excessive energy consumption is also caused, based on this, the operation frequency of the compressor 121 can be controlled to be reduced to reduce the top shell temperature of the compressor 121, so that not only can the refrigerant be guaranteed to have a higher recovery rate, but also the energy consumption can be reduced. In addition, in the case where the top shell temperature of the compressor 121 is less than the second threshold value, it means that the lower operation frequency of the compressor 121 at this time results in the lower top shell temperature of the compressor 121, that is, the recovery rate of the refrigerant has not reached the optimal recovery rate, and therefore, the operation frequency of the compressor 121 can be controlled to be increased to increase the top shell temperature of the compressor 121, thereby increasing the recovery rate of the refrigerant, thereby ensuring efficient refrigerant recovery. Of course, when the top shell temperature of the compressor 121 is less than or equal to the first threshold value and greater than or equal to the second threshold value, it means that the top shell temperature of the compressor 121 is not greatly different from the first preset temperature value, based on which it means that the refrigerant recovery speed is not opposite to the optimal recovery speed and energy is not excessively consumed, so that the compressor 121 can be controlled to keep the current operation frequency.
In addition, it should be noted that, since there is a certain delay in monitoring the top shell temperature of the compressor 121, the first threshold value and the second threshold value 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 value and the second threshold value, and based on this, the situation that the monitoring error causes erroneous adjustment can be prevented, so as to avoid frequent frequency fluctuation of the compressor 121.
In the embodiment of the present application, the sequence of steps S221, S223 and 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 controlling the compressor 121 to operate for a third preset time with the reduced operating frequency, if the top shell temperature value of the compressor 121 is smaller than the second threshold value, the step of controlling the compressor 121 to raise the operating frequency until the top shell temperature value of the compressor 121 is greater than or equal to the first preset temperature value is performed back.
In other words, after the down-conversion 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 down-conversion, and if the operation time reaches the third preset time, it is determined whether the top shell temperature value of the compressor 121 is less than the second threshold value, if the top shell temperature value of the compressor 121 is less than the second threshold value, it indicates that the temperature adjustment of the compressor 121 is excessive, and therefore, it is necessary to return to execute step S223 again to adjust the top shell temperature of the compressor 121, so that the recovery speed of the refrigerant is adjusted.
It should be noted that, the detection of the top shell temperature value 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 judging the state of the compressor 121 and preventing the erroneous adjustment of the operation frequency of the compressor 121 caused by the erroneous judgment.
Optionally, the value range of the third preset time may be 1min-3min; in other words, the third preset time may take a value of 1.5min, 2min, 2.5min, 3min, or the like.
Similarly, after step S223, the refrigerant recovery method further includes:
step S204, after controlling the compressor 121 to operate for a fourth preset time with the increased operating frequency, if the top shell temperature of the compressor 121 is greater than the first threshold, the step is performed back to control the compressor 121 to reduce the operating frequency until the top shell temperature of the compressor 121 is less than or equal to the first preset temperature value if the top shell temperature of the compressor 121 is greater than the first threshold.
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 if 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 value, if the top shell temperature value of the compressor 121 is greater than the first threshold value, it indicates that the temperature adjustment of the compressor 121 is excessive, and therefore, it is necessary to return to execute step S221 again to adjust the top shell temperature of the compressor 121, so that the recovery speed of the refrigerant is adjusted.
Similarly, the detection of the top shell temperature value of the compressor 121 is performed after the compressor 121 is operated for the fourth 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 judging the state of the compressor 121 and preventing the erroneous adjustment of the operation frequency of the compressor 121 caused by the erroneous judgment.
Optionally, the value range of the fourth preset time may be 1min-3min; 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, the values of the third preset time and the fourth preset time may be the same, and of course, the values of the third preset time and 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 raise the operation frequency and lower the operation frequency, the sequential counting is performed.
In other words, after the step S221 of down-converting the operation frequency of the compressor 121, if the top shell temperature of the compressor 121 is lower than the second threshold value, the step S223 of up-converting the operation frequency of the compressor 121 is performed again, and after the step of up-converting is completed, a count is performed once; in other words, one count is performed when one down-conversion control and one up-conversion control are completed.
Step 320, when the count reaches the preset number, the operation frequency after the next time of controlling the compressor 121 to raise the operation frequency is used to control the operation of the compressor 121 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 repeatedly controlled the frequency up and down a plurality of times, and that the top shell temperature of the compressor 121 is difficult to adjust between the first threshold value and the second threshold value, based on this, in order to prevent the frequency of the compressor 121 from repeatedly increasing and decreasing, the operation of the compressor 121 is controlled at the operation frequency after the next frequency up control. Of course, in other embodiments of the present application, the operation frequency after the one-time down-conversion control may be used 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, if 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 of step S221 or the frequency-up control of step S223, and controls the operation of the compressor 121 at the operation frequency obtained after the frequency-up control of this sub-step S223 until the recovery of the refrigerant is completed.
It should be noted that, compared with the operation frequency obtained after the frequency-reducing control, which controls the operation of the compressor 121 until the refrigerant is recovered, the operation frequency after the frequency-increasing control controls the operation of the compressor 121 until the refrigerant is recovered, and the top shell temperature of the compressor 121 is higher, so that the refrigerant recovery speed is higher, the refrigerant recovery can be rapidly completed, 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 step S10, the refrigerant recovery method may further include:
and S01, judging whether the recovery of the gaseous refrigerant is performed.
If yes, step S02 is performed to receive the top shell temperature value of the compressor 121.
In other words, if the recovery of the gaseous refrigerant has already been performed, the process may proceed to step S10.
In general, the recovered unit 11 includes both a gaseous refrigerant and a liquid refrigerant, and thus the gaseous refrigerant and the liquid refrigerant are recovered at the same time to improve the recovery efficiency. After the recovery process is performed for a period of time, the recovery of the liquid refrigerant is completed, and the gaseous refrigerant remains, based on which, if the determination structure of step S01 is yes, it indicates that the recovery of the gaseous refrigerant has been performed before, and at this time, the step of receiving the top shell temperature value of the compressor 121 can be directly performed.
If not, the compressor 121 is controlled to be turned on, and the operating frequency of the compressor 121 is controlled to be increased 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, and then the step of receiving the top shell temperature value of the compressor 121 is started.
In other words, if the recovery of the gaseous refrigerant has not been performed before, for example, in the case where only the gaseous refrigerant exists in the recovered unit 11, or in the case where the recovery of the liquid refrigerant is inconvenient to perform, the refrigerant recovery method provided by the present application may be performed, so that the operation frequency of the compressor 121 needs to be controlled to be raised sufficiently to enable the top shell temperature of the compressor 121 to reach the third preset temperature value, in other words, the refrigerant recovery speed is directly raised to be close to the optimal recovery speed, so that the refrigerant can be quickly recovered simultaneously in the process of controlling the operation frequency of the compressor 121, thereby improving the overall recovery efficiency.
It should be noted that, step S01 and step S02 precede step S05 and step S06, in other words, step S05 and step S06 are also required to be performed after step S01 and step S02, so that step S10 is entered to control the operation frequency of the compressor 121.
In summary, in the refrigerant recovery method and the refrigerant recovery device 10 provided by the application, the top shell temperature of the compressor 121 affects the recovery rate of the refrigerant in the process of performing refrigerant recovery, and therefore, in the refrigerant recovery method, the top shell temperature of the compressor 121 can be monitored in real time by controlling the operation frequency of the compressor 121 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 be close to the first preset temperature value, thereby ensuring that the recovery rate of the refrigerant is kept at a higher rate, improving the refrigerant recovery efficiency, and also preventing energy waste caused by blindly improving the operation frequency of the compressor 121. Therefore, the refrigerant recovery method provided by the application can solve the technical problem of low refrigerant recovery efficiency in the prior art.
In order to execute the possible steps of the refrigerant recovery method provided in the above embodiments, please refer to fig. 10, in which fig. 10 shows a functional block diagram of a refrigerant recovery control device 20 according to an embodiment of the present application. The refrigerant recovery control device 20 is applied to refrigerant recovery decoration to execute the refrigerant recovery method provided above. It should be noted that the basic principle and the technical effects of the refrigerant recovery control device 20 provided in this embodiment are substantially the same as those of the above embodiment, and for brevity, reference should be made to the corresponding contents of the above embodiment.
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 indicates 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 cooling is mixed in the first cooling medium recovery branch 12, and the second pressure value represents a pressure after the cooling is mixed in the first cooling medium recovery branch 12.
Alternatively, the receiving module 21 may be specifically configured to perform the step S10 and the step S05 in the foregoing respective figures, so as to achieve the corresponding technical effects.
The control module 22 is used for controlling 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 perform the step S20 and the sub-steps thereof in the foregoing respective figures, so as to achieve the corresponding technical effects.
The control module 22 may also be configured to perform the steps S01 and S02 in the respective figures described above, so as to achieve the corresponding technical effects.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus embodiments described above are merely illustrative, for example, of the flowcharts and block diagrams in the figures that illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. 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, functional modules in the embodiments of the present invention may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single 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 this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform 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, random Access Memory), a magnetic disk, or an optical disk, or 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 made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (10)
1. The 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 refrigerant; the refrigerant recovery device further comprises 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 refrigerant; 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 the liquid refrigerant is led into the first refrigerant branch for gas-liquid mixed recovery;
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;
controlling the compressor to increase or decrease the operating frequency according to the top shell temperature value and a first preset temperature value of the compressor so as to control the top shell temperature of the compressor to approach the first preset temperature value;
The refrigerant recovery method further includes, prior to the step of receiving the compressor top shell temperature value:
receiving a first pressure value and a second pressure value, wherein the first pressure value represents the pressure before the refrigerant in the first refrigerant recovery branch is mixed, and the second pressure value represents the pressure after the refrigerant in the first refrigerant recovery branch is mixed;
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.
2. The refrigerant recovery method according to claim 1, wherein the step of controlling the operation frequency of the compressor to be increased or decreased according to the compressor top shell temperature value and a first preset temperature value comprises: acquiring a first threshold and a second threshold according to the first preset temperature value, wherein the first threshold is larger than the second threshold;
and controlling the compressor to increase or decrease the operating frequency according to the magnitude relation among the top shell temperature value of the compressor, the first threshold value and the second threshold value.
3. The refrigerant recovery method according to claim 2, wherein the step of controlling the operation frequency of the compressor to be increased or decreased according to the magnitude relation 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 larger than the first threshold value, controlling the compressor to reduce the running frequency until the temperature value of the top shell of the compressor is smaller 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 operating 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 larger than or equal to the second threshold value and the temperature value of the top shell of the compressor is smaller than or equal to the 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 compressor top shell temperature value is less than or equal to the first preset temperature value, the refrigerant recovery method further comprises:
after controlling the compressor to run for a third preset time with the reduced running frequency, if the temperature value of the top shell of the compressor is smaller than the second threshold value, returning to execute the step of controlling the compressor to raise 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 if the temperature value of the top shell of the compressor is smaller than the second threshold value;
After the step of controlling the compressor to raise 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 includes:
and after the compressor is controlled to run for a fourth running time according to the increased running frequency, if the temperature value of the top shell of the compressor is larger than the first threshold value, returning to the step of controlling the compressor to reduce the running frequency until the temperature value of the top shell of the compressor is smaller than or equal to the first preset temperature value if the temperature value of the top shell of the compressor is larger than the first threshold value.
5. The refrigerant recovery method according to claim 4, further comprising:
counting once while continuously controlling the compressor to raise and lower an operating frequency;
when the count reaches the preset times, the operation frequency after the operation frequency of the compressor is controlled to be increased next time is used for controlling the operation of the compressor until the refrigerant recovery is completed.
6. The refrigerant recovery method according to claim 3, wherein the step of controlling the compressor to reduce an operation frequency includes:
controlling the operation frequency of the compressor to reduce a first preset frequency value at intervals of a first preset time;
The step of controlling the compressor to raise the operating frequency includes:
controlling the operation frequency of the compressor to rise 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 acquiring 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 the first threshold value;
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, further comprising, prior to the step of receiving a compressor top shell temperature value:
judging whether recovery of the gaseous refrigerant is performed;
if yes, executing the step of receiving the temperature value of the top shell of the compressor;
if not, controlling the compressor to be started, and controlling the running frequency of the compressor to be increased by a third preset frequency value every fifth preset time until the top shell temperature of the compressor reaches a second preset temperature value, and starting to execute the step of receiving the top shell temperature value of the compressor.
9. The 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 with a recovered unit, the other end of the first refrigerant recovery branch is connected with a recovery container, and a compressor is arranged on the first refrigerant recovery branch; the refrigerant recovery device further comprises 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 refrigerant; 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 the liquid refrigerant is led into the first refrigerant branch for gas-liquid mixed recovery;
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; the receiving module 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 in the first refrigerant recovery branch is mixed, and the second pressure value represents a pressure after the refrigerant in the first refrigerant recovery branch is mixed;
The control module is used for controlling the compressor to increase or decrease the running frequency according to the top shell temperature value of the compressor and a first preset temperature value so as to control the top shell temperature of the compressor to approach the first preset temperature value; the control module is further configured to execute the step of receiving a compressor top shell temperature value if a difference between the first pressure value and the second pressure value is less than or equal to a preset pressure value.
10. 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 the recovered unit, the other end of the first refrigerant recovery branch is connected to the recovery container, the compressor is arranged on the first refrigerant recovery branch, and the temperature detection device is arranged on the top shell of the compressor to detect the temperature of the top shell of the compressor so as to obtain the 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 temperature value of the top shell of the compressor to the controller; the refrigerant recovery device further comprises 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 refrigerant; 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 the liquid refrigerant is led into the first refrigerant branch for gas-liquid mixed recovery; the controller is configured to perform the refrigerant recovery method according to any one of claims 1 to 8.
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Effective date of registration: 20221012 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant after: NINGBO AUX ELECTRIC Co.,Ltd. Applicant after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Applicant before: NINGBO AUX ELECTRIC Co.,Ltd. Applicant before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |
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