CN115096024A - Refrigerant recovery control method and device and refrigerant recovery system - Google Patents
Refrigerant recovery control method and device and refrigerant recovery system Download PDFInfo
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- CN115096024A CN115096024A CN202210707046.1A CN202210707046A CN115096024A CN 115096024 A CN115096024 A CN 115096024A CN 202210707046 A CN202210707046 A CN 202210707046A CN 115096024 A CN115096024 A CN 115096024A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
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Abstract
The invention provides a refrigerant recovery control method, a refrigerant recovery control device and a refrigerant recovery system, and relates to the technical field of refrigerant recovery. The refrigerant recovery control method is applied to a refrigerant recovery system, wherein the refrigerant recovery system comprises a first recovery pipeline, one end of the first recovery pipeline is connected to a system to be recovered, and the other end of the first recovery pipeline is connected to a recovery container; the first recovery pipeline is provided with a compressor and a heat exchanger, the compressor is used for extracting gaseous refrigerant in the system to be recovered when the compressor operates and guiding the refrigerant to the heat exchanger; the refrigerant having passed through the heat exchanger is introduced into the recovery tank. The refrigerant recovery control method includes determining an operating frequency of the compressor according to a vessel pressure value and an outer disc temperature value such that the vessel pressure value approaches a preset pressure value. The refrigerant recovery control device and the refrigerant recovery system provided by the invention can execute the method. The refrigerant recovery control method, the refrigerant recovery control device and the refrigerant recovery system can improve the recovery efficiency of the refrigerant.
Description
Technical Field
The invention relates to the technical field of refrigerant recovery, in particular to a refrigerant recovery control method, a refrigerant recovery control device and a refrigerant recovery system.
Background
The application and development of refrigerant recovery containers are slow, besides the environmental awareness of workers is not enough, an important reason is that many refrigerant recovery containers have various defects of low recovery speed, low efficiency and the like in the practical application process at present, while recovery containers with relatively high recovery speed have the problems of large volume, inconvenience in carrying and the like, but some refrigerant recovery containers have small volume and relatively slow recovery speed of portable equipment.
However, in the prior art, in order to improve the recovery efficiency of the refrigerant, an operator is usually required to control the compressor by his own experience, so as to achieve the purpose of improving the recovery efficiency of the refrigerant; however, the control method based on this is generally liable to cause excessive consumption of energy, and is disadvantageous in energy saving.
Disclosure of Invention
The problem to be solved by the invention is how to prevent the excessive consumption of energy while improving the recovery efficiency of the refrigerant.
In order to solve the above problems, the present invention provides a refrigerant recovery control method, which is applied to a refrigerant recovery system, wherein the refrigerant recovery system includes a first recovery pipeline, one end of the first recovery pipeline is connected to a system to be recovered, and the other end of the first recovery pipeline is connected to a recovery container; a compressor and a heat exchanger are arranged on the first recovery pipeline, and the compressor is used for extracting gaseous refrigerant in the system to be recovered and guiding the refrigerant to the heat exchanger during operation; the refrigerant passing through the heat exchanger is introduced into the recovery tank, and the refrigerant recovery control method includes:
receiving a vessel pressure value representing a pressure inside the recovery vessel;
receiving an outer disc temperature value, wherein the outer disc temperature value represents the temperature of an outer disc of the heat exchanger;
and controlling the compressor to determine the operating frequency according to the container pressure value and the outer disc temperature value, so that the container pressure value approaches to the preset pressure value.
Compared with the prior art, the refrigerant recovery control method provided by the invention has the beneficial effects that:
in the process of recovering the refrigerant in the system for recovery through the refrigerant recovery system, the recovery rate of the refrigerant is increased according to the operation frequency of the compressor, and at the same time, the pressure in the recovery vessel and the temperature of the outer plate of the heat exchanger are changed. However, when the pressure inside the recovery container reaches a certain value and the temperature of the outer plate of the heat exchanger reaches a certain value, the recovery rate of the refrigerant is significantly increased even if the operating frequency of the compressor is continuously increased. Based on this, can control the operating frequency of compressor according to the inside pressure of recovery vessel and the outer dish temperature of heat exchanger, can guarantee the operating frequency of compressor can not too high the condition that leads to the energy waste when rising refrigerant recovery speed, based on this, can not only reach the purpose that improves recovery efficiency, can also ensure the effective utilization of the energy simultaneously. Therefore, the refrigerant recovery control method provided by the invention can improve the recovery efficiency of the refrigerant, can also improve the utilization rate of energy, and solves the technical problem that energy is not beneficial to energy conservation due to excessive energy consumption.
In addition, when the operation frequency of the compressor is adjusted according to the pressure in the recovery container, the operation frequency of the compressor is further adjusted according to the temperature of the outer plate of the heat exchanger, thereby preventing the control precision of the compressor from being influenced by the detection error or the detection lag. In other words, the compressor can be controlled according to the container pressure value and the outer disc temperature value at the same time to determine the operation frequency, so that the control precision of the compressor can be improved.
Optionally, the step of controlling the compressor to determine an operating frequency according to the container pressure value and the outer disc temperature value, so that the container pressure value approaches the preset pressure value includes:
judging whether the container pressure value is within an interval defined by a first pressure threshold and a second pressure threshold and whether the outer disc temperature value is within an interval defined by a first temperature threshold and a second temperature threshold;
if the container pressure value is not within the interval defined by the first pressure threshold value and the second pressure threshold value, or if the outer disc temperature value is not within the interval defined by the first temperature threshold value and the second temperature threshold value, controlling the compressor to increase or decrease the operating frequency so as to enable the container pressure value to approach the preset pressure value;
if the container pressure value is located in an interval defined by the first pressure threshold and the second pressure threshold, controlling the compressor to maintain the current operating frequency until the refrigerant recovery is finished;
the first pressure threshold value is obtained by subtracting a first preset value from a preset pressure value, the second pressure threshold value is obtained by adding a second preset value to the preset pressure value, and the first pressure threshold value is smaller than the second pressure threshold value; the first temperature threshold is obtained by subtracting a third preset value from a preset temperature value, the second temperature threshold is obtained by adding a fourth preset value to the preset temperature value, and the first temperature threshold is smaller than the second temperature threshold.
Under the condition that the pressure value of the container reaches a preset pressure value, the temperature of the outer disc corresponding to the heat exchanger is a preset temperature value; and, continuing to promote the container pressure value through rising compressor operating frequency, the recovery speed of refrigerant also does not have obvious rising, consequently, adjusts the container pressure value through the operating frequency of control compressor and approaches to preset pressure value, just can realize improving the purpose of the recovery efficiency of refrigerant accurately.
Optionally, if the vessel pressure value is not within the interval defined by the first pressure threshold and the second pressure threshold, or if the outer disc temperature value is not within the interval defined by the first temperature threshold and the second temperature threshold, the step of controlling the compressor to increase or decrease the operating frequency so that the vessel pressure value approaches the preset pressure value includes:
if the container pressure value is greater than the second pressure threshold value, or the outer disc temperature value is greater than the second temperature threshold value, controlling the compressor to reduce the operating frequency until the container pressure value is less than or equal to the preset pressure value and the outer disc temperature value is less than or equal to the preset temperature value;
if the container pressure value is smaller than the first pressure threshold value, or the outer disc temperature value is smaller than the first temperature threshold value, controlling the compressor to increase the operating frequency until the container pressure value is larger than or equal to the preset pressure value and the outer disc temperature value is larger than or equal to the preset temperature value;
and controlling the compressor to operate for a first preset time at the adjusted operating frequency, and returning to execute the step of judging whether the container pressure value is located in an interval defined by a first pressure threshold and a second pressure threshold and whether the outer disc temperature value is located in an interval defined by a first temperature threshold and a second temperature threshold until the container pressure value is located in the interval defined by the first pressure threshold and the second pressure threshold.
In the recovery process, the operation frequency of the compressor is controlled repeatedly according to the size relationship between the container pressure value and the preset pressure value and the size relationship between the outer disc temperature value and the preset temperature value, so that the container pressure value is closer to the preset pressure value, the outer disc temperature value is closer to the preset temperature value, and the purpose of improving the recovery efficiency of the refrigerant can be effectively realized.
Optionally, the refrigerant recovery control method further includes:
counting when controlling the compressor to finish raising the operation frequency once and finish lowering the operation frequency once;
and when the counting reaches the preset times, controlling the compressor to operate at the operating frequency after the compressor finishes increasing the operating frequency for the next time until the recovery of the refrigerant is finished.
Of course, in order to prevent the operation frequency of the compressor from frequently fluctuating to cause the operation failure of the compressor, after the operation frequency of the compressor is adjusted by the preset times, the refrigerant can be recovered at the operation frequency after the frequency of the compressor is increased next time, so that the frequent fluctuation of the operation frequency of the compressor can be prevented, and the purpose of effectively increasing the refrigerant recovery speed can be ensured.
Optionally, the step of controlling the compressor to reduce the operating frequency until the container pressure value is less than or equal to the preset pressure value and the outer disc temperature value is less than or equal to the preset temperature value includes:
controlling the running frequency of the compressor to reduce a preset frequency every other second preset time until the pressure value of the container is less than or equal to the preset pressure value and the temperature value of the outer disc is less than or equal to the preset temperature value;
the step of controlling the compressor to increase the operating frequency until the pressure value of the container is greater than or equal to the preset pressure value and the temperature value of the outer disc is greater than or equal to the preset temperature value comprises the following steps:
and controlling the running frequency of the compressor to increase a preset frequency every other third preset time until the pressure value of the container is greater than or equal to the preset pressure value and the temperature value of the outer disc is greater than or equal to the preset temperature value.
Optionally, the ratio of the preset pressure value to the nominal withstand pressure of the recovery vessel is 0.6-0.8.
Optionally, the refrigerant recovery system further comprises a second recovery line and a recovery branch;
one end of the second recovery pipeline is connected to the bottom of the system to be recovered, and the other end of the second recovery pipeline is connected to the recovery container; a second switch valve is arranged on the second recovery pipeline; one end of the recovery branch is connected to the second recovery pipeline between the second switch valve and the system to be recovered, and the other end of the recovery branch is connected to the first recovery pipeline between the compressor and the heat exchanger; a third switch valve is arranged on the recovery branch;
before receiving the vessel pressure value, the refrigerant recovery control method further includes:
receiving a front end pressure value indicative of a refrigerant pressure in the first recovery line between the compressor and the recovery branch and a back end pressure value indicative of a refrigerant pressure in the first recovery line between the heat exchanger and the recovery branch;
and if the difference value between the front end pressure value and the rear end pressure value is smaller than or equal to a preset difference value, controlling the second switch valve and the third switch valve to be closed, and then executing the step of receiving the pressure value of the container.
Optionally, the refrigerant recovery system further comprises a nitrogen plant; the output end of the nitrogen device is connected to the system to be recovered;
and when the difference value between the front end pressure value and the rear end pressure value is smaller than or equal to a preset difference value, controlling the nitrogen device to be opened so as to fill nitrogen into the system to be recovered.
A refrigerant recovery control device comprising:
a first receiving module for receiving a vessel pressure value, the vessel pressure value being indicative of a pressure inside the recovery vessel;
the second receiving module is used for receiving an outer disc temperature value, and the outer disc temperature value represents the temperature of the outer disc of the heat exchanger;
and the control module is used for controlling the compressor to determine the operating frequency according to the container pressure value and the outer disc temperature value so as to enable the container pressure value to approach the preset pressure value.
A refrigerant recovery system comprising:
one end of the first recovery pipeline is connected to a system to be recovered, and the other end of the first recovery pipeline is connected to a recovery container; a compressor and a heat exchanger are arranged on the first recovery pipeline, and the compressor is used for extracting gaseous refrigerant in the system to be recovered and guiding the refrigerant to the heat exchanger during operation; the refrigerant passing through the heat exchanger is introduced into the recovery vessel;
a pressure detection device provided in the recovery container to detect a pressure inside the recovery container;
the temperature detection device is arranged on the heat exchanger to detect the temperature of the outer disc of the heat exchanger;
and the controller is electrically connected with the pressure detection device and the temperature detection device and is used for executing the refrigerant recovery control method.
The beneficial effects of the refrigerant recovery control device and the refrigerant recovery system in comparison with the prior art are the same as the beneficial effects of the refrigerant recovery control method in comparison with the prior art, and the details are not repeated herein.
Drawings
Fig. 1 shows a schematic configuration diagram of a refrigerant recovery system provided in an embodiment of the present application;
fig. 2 shows a flowchart of a refrigerant recovery control method provided in an embodiment of the present application;
FIG. 3 is a graph showing the pressure value of the vessel versus the refrigerant recovery rate;
FIG. 4 shows a graph of outer disc temperature values versus refrigerant recovery rate;
fig. 5 is a flowchart showing step S4 in the refrigerant recovery control method in the embodiment of the present application;
fig. 6 is a flowchart showing step S42 in the refrigerant recovery control method in the embodiment of the present application;
fig. 7 shows a partial flowchart of a refrigerant recovery control method provided in an embodiment of the present application;
fig. 8 shows a functional block diagram of a refrigerant recovery device provided in the embodiment of the present application.
Description of reference numerals:
1-a refrigerant recovery system; 11-a first recovery line; 111-a compressor; 112-a heat exchanger; 1121-temperature detection means; 113-a laval nozzle; 114-a first on-off valve; 115-a first pressure sensor; 116-a second pressure sensor; 12-a second recovery line; 121-a second on-off valve; 13-recovery branch; 131-a third on-off valve; 100-a first receiving module; 14-the system to be recovered; 15-a recovery vessel; 151-pressure detection means; 16-nitrogen unit; 200-a second receiving module; 300-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.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a refrigerant recovery system 1 provided in an embodiment of the present application. In the embodiment of the present application, a refrigerant recovery system 1 is provided, and the refrigerant recovery system 1 is used for recovering the refrigerant in the system to be recovered 14, in other words, the refrigerant in the system to be recovered 14 can be extracted and introduced into a container for collecting the refrigerant.
The refrigerant recovery system 1 comprises a first recovery line 11, a second recovery line 12 and a recovery branch 13. The first recycling pipeline 11 is provided with a compressor 111 and a heat exchanger 112, one end of the first recycling pipeline 11 is connected to the system 14 to be recycled, and the other end of the first recycling pipeline 11 is connected to the recycling container 15, so as to recycle the gaseous refrigerant in the system 14 to be recycled. One end of the second recovery pipeline 12 is connected to the bottom of the system 14 to be recovered, and the other end is connected to the recovery container 15, so as to recover the liquid refrigerant in the system 14 to be recovered. One end of the recovery branch 13 is connected to the first recovery line 11 between the compressor 111 and the heat exchanger 112, and the other end is connected to the second recovery branch 13, so that when the recovery branch 13 is opened, the gas refrigerant and the liquid refrigerant can be mixed and recovered. Further, a first switching valve 114 is provided on the first recovery pipe 11, and the first switching valve 114 is used for switching on or off the first recovery pipe 11; a second switch valve 121 is arranged on the second recovery pipeline 12, and the second switch valve 121 is used for switching on or off the second recovery pipeline 12; the recovery branch 13 is provided with a third on-off valve 131, and the third on-off valve 131 is used for turning on or off the recovery branch 13. Further, a laval nozzle 113 is provided in the first recovery line 11, and the laval nozzle 113 is provided between the compressor 111 and the recovery branch line 13.
It should be noted that, in general, the system to be recovered 14 stores liquid refrigerant and gaseous refrigerant, during the refrigerant recovery process, the liquid refrigerant can be directly led out to the recovery container 15 through the second recovery line 12, while the gaseous refrigerant needs to provide recovery power through the compressor 111 in the first recovery line 11 to be recovered from the first recovery line 11. Due to the low pressure formed at the laval nozzle 113, the liquid refrigerant can be recovered from the recovery branch 13 by opening the third on/off valve 131, i.e. by mixing the gaseous refrigerant and the liquid refrigerant. After the liquid refrigerant recovery is completed, a large amount of gaseous refrigerant remains in the system 14 to be recovered, and the recovery of pure gaseous refrigerant is started.
Of course, if only gaseous refrigerant is present in the system to be recovered 14, then recovery of pure gaseous refrigerant can be started directly by the refrigerant recovery system 1. Alternatively, if only the first recovery line 11 is provided in the refrigerant recovery system 1, in other words, the refrigerant recovery system 1 can recover only the gaseous refrigerant, the recovery of the pure gaseous refrigerant may be started as it is.
In the pure gas refrigerant recovery process, the recovery speed of the refrigerant can be increased along with the increase of the running frequency of the compressor 111; however, when the pressure inside the recovery container 15 reaches a certain value and the temperature of the outer plate of the heat exchanger 112 correspondingly reaches a certain value, if the operation frequency of the compressor 111 is continuously increased, the recovery rate of the refrigerant is slightly increased, and thus, excessive energy consumption is easily caused. In order to improve the above problems, the present application also provides a refrigerant recovery control method. The refrigerant recovery control method can improve the recovery efficiency of the refrigerant and prevent the excessive consumption of energy.
In order to facilitate the above-mentioned refrigerant recovery control method, a controller is provided in the refrigerant recovery system 1, and the controller can execute the above-mentioned refrigerant recovery control method to adjust or maintain the operating frequency of the compressor 111.
Referring to fig. 2, fig. 2 is a flowchart illustrating a refrigerant recovery control method provided in an embodiment of the present application, where the refrigerant recovery control method includes:
and S1, receiving the front end pressure value and the rear end pressure value.
Wherein the front end pressure value represents the refrigerant pressure in the first recovery line 11 between the compressor 111 and the recovery branch 13, in other words, the refrigerant pressure in the first recovery line 11 before the refrigerant flows to be mixed with the refrigerant in the recovery branch 13. The rear end pressure value represents the pressure of the refrigerant in the first recovery line 11 between the heat exchanger 112 and the recovery branch 13, in other words the pressure of the refrigerant after flowing in the first recovery line 11 to be mixed with the refrigerant in the recovery branch 13. Of course, with continued reference to fig. 1, in order to conveniently detect the front end pressure value and the rear end pressure value, the refrigerant recovery system 1 further includes a first pressure sensor 115 and a second pressure sensor 116 for detecting the refrigerant pressure, where the first pressure sensor 115 is disposed on the first recovery pipeline 11 between the laval nozzle 113 and the recovery branch 13 for detecting the front end pressure value; a second pressure sensor 116 is arranged in the first recovery line 11 between the recovery branch 13 and the heat exchanger 112 for detecting a back-end pressure value.
It should be noted that the first pressure sensor 115 and the second pressure sensor 116 are both electrically connected to the controller and are configured to send the front end pressure value and the rear end pressure value to the controller.
Referring to fig. 2, in step S11, if the difference between the front end pressure value and the rear end pressure value is smaller than or equal to the preset difference, the second on-off valve 121 and the third on-off valve 131 are both controlled to close.
At this time, in the case where both the second switching valve 121 and the third switching valve 131 are closed, the gaseous refrigerant may be drawn from the belt recovery system by the operation of the compressor 111 to perform the recovery of the pure gaseous refrigerant while maintaining the first switching valve 114 open.
It should be noted that, if only the first recovery line 11 is included in the refrigerant recovery system 1, or if neither the second switching valve 121 nor the third switching valve 131 is opened to directly perform the recovery of the gaseous refrigerant, the steps S1 and S11 may be omitted.
Optionally, referring to fig. 1, in order to improve the refrigerant recovery efficiency, in some embodiments of the present application, the refrigerant recovery system 1 further includes a nitrogen device 16, and an output end of the nitrogen device 16 is connected to the system to be recovered 14. In the case of performing step S11, the nitrogen device 16 may be simultaneously turned on, the nitrogen device 16 charges nitrogen into the system to be recovered 14, and the pressure in the system to be recovered 14 may be maintained at a high level, so that the discharge of the gaseous refrigerant may be improved, and the recovery efficiency of the gaseous refrigerant may be improved.
It should be understood that in other embodiments, the nitrogen device 16 may be eliminated.
In an embodiment of the present application, referring to fig. 1 and fig. 2 in combination, after performing step S11, the refrigerant recovery control method includes:
and S2, receiving the pressure value of the container.
The vessel pressure value indicates the pressure inside the recovery vessel 15. It should be noted that, in order to obtain the container pressure value, the refrigerant recovery system 1 further includes a pressure detection device 151, the pressure detection device 151 is disposed inside the recovery container 15, and the pressure detection device 151 is used for detecting the pressure inside the recovery container 15. Of course, the pressure detection device 151 is electrically connected to the controller, so that the pressure detection device 151 can send the detected pressure value of the container to the controller conveniently.
And S3, receiving the outer disk temperature value.
The outer disc temperature value represents the temperature of the outer disc of the heat exchanger 112. It should be noted that, in order to obtain the temperature value of the outer disc, the refrigerant recovery system 1 further includes a temperature detection device 1121, and the temperature detection device 1121 is disposed on the outer disc of the heat exchanger 112, in other words, the temperature detection device 1121 is disposed outside the heat exchanger 112 to detect the temperature of the outer disc of the heat exchanger 112. Of course, the temperature detecting device 1121 is electrically connected to the controller, so that the temperature detecting device 1121 can conveniently send the detected temperature value of the outer disk to the controller.
S4, controlling the compressor 111 to determine the operation frequency according to the container pressure value and the outer disk temperature value, so that the container pressure value approaches the preset pressure value.
It should be noted that, when the pressure value of the container reaches the preset pressure value, the temperature of the outer plate corresponding to the heat exchanger 112 is the preset temperature value.
In addition, please refer to fig. 3 and 4 in combination, in the process of recovering the gaseous refrigerant, fig. 3 shows a graph of the relation between the container pressure value and the refrigerant recovery speed, and fig. 4 shows a graph of the relation between the outer plate temperature value and the refrigerant recovery speed.
In fig. 3, sit uprightThe scale indicates the refrigerant recovery rate and the abscissa indicates the tank pressure value. The curve shows that the pressure value in the container is from P 1 Is increased to P 0 The refrigerant recovery rate is positively correlated with the vessel pressure value, i.e. in case of an increase in the vessel pressure value, the refrigerant recovery rate is increased synchronously. And the relationship between the refrigerant recovery speed and the container pressure value is as follows: the refrigerant recovery rate is M times the vessel pressure value, where M is a constant coefficient related to the nominal pressure of the recovery vessel 15, in other words, in the case where the recovery vessel 15 is determined, the value of M may be determined according to the nominal pressure of the recovery vessel 15. For example, when the nominal pressure of the recovery vessel 15 is 6Mpa, M may be 1/3. However, at a vessel pressure value greater than P 0 In the case of (2), the refrigerant recovery rate is substantially maintained.
In fig. 4, the ordinate represents the refrigerant recovery rate, and the abscissa represents the outer pan temperature value. It can be seen from this graph that the outside temperature value is from T 1 Is raised to T 0 In the process of (2), the refrigerant recovery speed is positively correlated with the outer disc temperature value, namely, under the condition that the outer disc temperature value is increased, the refrigerant recovery speed is synchronously increased. And the relationship between the refrigerant recovery speed and the outer disc temperature value is as follows: the refrigerant recovery speed is K times of the temperature value of the outer disc, where K is a constant coefficient related to the heat exchange area of the heat exchanger 112, in other words, the value of K can be determined according to the heat exchange area of the heat exchanger 112 when the heat exchange area of the heat exchanger 112 is determined. For example, in the case where the heat exchange area of the heat exchanger 112 is 0.1mm, K may be 1/2. However, at the outer disk temperature value greater than T 0 In the case of (2), the refrigerant recovery rate is substantially maintained.
In summary, it can be seen from fig. 3 that the pressure value of the container reaches the preset pressure value P 0 Then, under the condition of continuously increasing the pressure value of the container, the refrigerant recovery speed is slightly increased; as can be seen from fig. 4, when the outer disk temperature reaches the preset temperature T 0 And then, under the condition of continuously increasing the temperature value of the outer disc, the refrigerant recovery speed is slightly increased.
Based on this, in the process of recovering the refrigerant in the system for recovery 14 by the refrigerant recovery system 1, the recovery speed of the refrigerant is increased according to the operation frequency of the compressor 111, and at the same time, the pressure in the recovery vessel 15 and the temperature of the outer plate of the heat exchanger 112 are caused to change. However, when the pressure inside the recovery container 15 reaches a certain value and the temperature of the outer plate of the heat exchanger 112 reaches a certain value, the recovery rate of the refrigerant is significantly increased even if the operating frequency of the compressor 111 is continuously increased. Therefore, the operation frequency of the compressor 111 can be controlled according to the pressure inside the recovery container 15 and the temperature of the outer plate of the heat exchanger 112, and the operation frequency of the compressor 111 can be ensured not to be too high to cause energy waste while the refrigerant recovery speed is increased. In other words, the refrigerant recovery control method provided by the application can not only improve the recovery efficiency of the refrigerant, but also improve the utilization rate of energy, and solves the technical problem that energy is not beneficial to energy conservation due to excessive energy consumption.
In addition, when the operating frequency of the compressor 111 is adjusted according to the pressure inside the recovery container 15, the operating frequency of the compressor 111 is further adjusted according to the outer disk temperature of the heat exchanger 112, and thus it is possible to prevent detection errors or detection delays from affecting the control accuracy of the compressor 111. In other words, the operating frequency can be determined by controlling the compressor 111 according to both the vessel pressure value and the outer disk temperature value, which can improve the control accuracy of the compressor 111.
Optionally, in an embodiment of the present application, a ratio of the preset pressure value to the nominal withstand pressure of the recovery container 15 is 0.6 to 0.8, where the ratio is a value calculated by taking the preset pressure value as a numerator and the nominal withstand pressure of the recovery container 15 as a denominator. Alternatively, the ratio may be 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, or the like. In addition, in general, the preset temperature value ranges from 52 ℃ to 58 ℃, in other words, the preset temperature value can be 52 ℃, 53 ℃, 54 ℃, 55 ℃, 56 ℃, 57 ℃ or 58 ℃ and the like; the preset temperature value is generally related to the size of the compressor 111 and the type of refrigerant, and for example, when the compressor 111 with 27.5ML displacement is used to recover R32 refrigerant, the preset temperature value is 52 ℃. Of course, both the preset pressure value and the preset temperature value may be pre-stored in the controller when the refrigerant recovery system 1 is manufactured.
Alternatively, referring to fig. 5, fig. 5 shows a flowchart of step S4 in the refrigerant recovery control method in the embodiment of the present application. Step S4 may include:
and S41, judging whether the pressure value of the container is within the interval defined by the first pressure threshold and the second pressure threshold, and whether the temperature value of the outer disk is within the interval defined by the first temperature threshold and the second temperature threshold.
The first pressure threshold value is obtained by subtracting a first preset value from a preset pressure value, the second pressure threshold value is obtained by adding a second preset value to the preset pressure value, and the first pressure threshold value is smaller than the second pressure threshold value; the first temperature threshold value is obtained by subtracting a third preset value from a preset temperature value, the second temperature threshold value is obtained by adding a fourth preset value to the preset temperature value, and the first temperature threshold value is smaller than the second temperature threshold value.
Optionally, the first preset value ranges from 0.05Mpa to 0.2Mpa, in other words, the first preset value may range from 0.05Mpa, 0.06Mpa, 0.07Mpa, 0.08Mpa, 0.09Mpa, 0.1Mpa, 0.11Mpa, 0.12Mpa, 0.13Mpa, 0.14Mpa, 0.15Mpa, 0.16Mpa, 0.17Mpa, 0.18Mpa, 0.19Mpa, or 0.2 Mpa. The second predetermined value can be 0.05Mpa-0.2Mpa, in other words, the second predetermined value can be 0.05Mpa, 0.06Mpa, 0.07Mpa, 0.08Mpa, 0.09Mpa, 0.1Mpa, 0.11Mpa, 0.12Mpa, 0.13Mpa, 0.14Mpa, 0.15Mpa, 0.16Mpa, 0.17Mpa, 0.18Mpa, 0.19Mpa or 0.2 Mpa. Of course, the first preset value and the second preset value may take the same value, or may take different values. The value range of the third preset value is 0.3-0.8 ℃; in other words, the third predetermined value can be 0.3 ℃, 0.4 ℃, 0.5 ℃, 0.6 ℃, 0.7 ℃ or 0.8 ℃ and the like. The value range of the fourth preset value is 0.3-0.8 ℃; in other words, the fourth predetermined value can be 0.3 ℃, 0.4 ℃, 0.5 ℃, 0.6 ℃, 0.7 ℃ or 0.8 ℃ or the like. Of course, the third preset value and the fourth preset value may take the same value, or may take different values.
It should be noted that, because there is a certain lag or error between the pressure detection device 151 and the temperature detection device 1121 when the pressure detection device 151 detects the pressure value of the vessel and between the temperature detection device 1121 detects the temperature value of the outer disk of the heat exchanger 112, based on this, in order to improve the control accuracy of the operating frequency of the compressor 111 and to prevent the operating frequency of the compressor 111 from being controlled to frequently fluctuate, the operating frequency of the compressor 111 is controlled by selecting the interval defined by the first pressure threshold value and the second pressure threshold value and the interval defined by the first temperature threshold value and the second temperature threshold value, so that the control accuracy can be improved and the stability can be ensured.
Step S42, if the pressure value of the container is not within the interval defined by the first pressure threshold and the second pressure threshold, or if the temperature value of the outer disk is not within the interval defined by the first temperature threshold and the second temperature threshold, controlling the compressor 111 to increase or decrease the operating frequency, so as to make the pressure value of the container approach the preset pressure value.
In other words, in the case where the reservoir pressure value is not located in the interval defined by the first pressure threshold value and the second pressure threshold value, or in the case where the outer disc temperature value is not located in the interval defined by the first temperature threshold value and the second temperature threshold value, it means that the reservoir pressure value is greatly different from the preset pressure value, or that the outer disc temperature value is greatly different from the preset temperature value. At this time, as can be seen from the graphs of fig. 3 and 4, the refrigerant recovery rate is not optimal; or, the pressure value of the container is too high or the temperature value of the outer plate of the heat exchanger 112 is too high, and it is seen that the operation frequency of the compressor 111 is high, which causes too much energy consumption, and is not beneficial to energy saving. Based on this, it is necessary to control the compressor 111 to increase the operation frequency or decrease the operation frequency so that the pressure value of the container can approach the preset pressure value, thereby preventing the excessive consumption of energy while achieving the improvement of the refrigerant recovery efficiency.
Alternatively, referring to fig. 6, fig. 6 shows a flowchart of step S42 in the refrigerant recovery control method in the embodiment of the present application, and step S42 may include:
s421, if the pressure value of the container is greater than the second pressure threshold, or the temperature value of the outer disk is greater than the second temperature threshold, controlling the compressor 111 to reduce the operating frequency until the pressure value of the container is less than or equal to the preset pressure value and the temperature value of the outer disk is less than or equal to the preset temperature value.
In the case that the container pressure value is greater than the second pressure threshold value, or the outer disk temperature value is greater than the second temperature threshold value, it indicates that the operating frequency of the compressor 111 is too high, resulting in excessive consumption of energy, and based on this, the energy consumption can be reduced by reducing the operating frequency of the compressor 111. Of course, if the vessel pressure value is less than or equal to the preset pressure value and the outer disk temperature value is less than or equal to the preset temperature value, the recovery speed of the refrigerant is reduced if the operation frequency of the compressor 111 is continuously reduced, so that the reduction of the operation frequency of the compressor 111 is stopped at this time to ensure that the recovery of the refrigerant is efficiently completed.
Optionally, in some embodiments of the present application, in step S421, the operation frequency of the compressor 111 is controlled to be decreased by: and controlling the operating frequency of the compressor 111 to reduce the preset frequency every second preset time until the pressure value of the container is less than or equal to the preset pressure value and the temperature value of the outer disc is less than or equal to the preset temperature value. The value of the second preset time may range from 10s to 20s, in other words, the value of the second preset time may be 10s, 11s, 12s, 13s, 14s, 15s, 16s, 17s, 18s, 19s, 20s, or the like. The predetermined frequency ranges from 1HZ to 3HZ, in other words, the predetermined frequency may be 1HZ, 2HZ, or 3 HZ.
It should be understood that in other embodiments of the present application, the manner of reducing the operating frequency of the compressor 111 may also be other manners, for example, controlling the compressor 111 to continuously reduce the operating frequency within 10s, reducing the operating frequency by 10HZ, and the like.
S422, if the container pressure value is less than the first pressure threshold value, or the outer disk temperature value is less than the first temperature threshold value, the compressor 111 is controlled to increase the operating frequency until the container pressure value is greater than or equal to the preset pressure value and the outer disk temperature value is greater than or equal to the preset temperature value.
Under the condition that the container pressure value is smaller than the first pressure threshold value or the outer disc temperature value is smaller than the first temperature threshold value, the operation frequency of the compressor 111 is low, so that the recovery speed of the refrigerant is not optimal, and on the basis, the container pressure value and the outer disc temperature value can be increased in a mode of increasing the operation frequency of the compressor 111, so that the purpose of increasing the recovery speed of the refrigerant is achieved. Of course, if the container pressure value is greater than or equal to the second pressure threshold value and the outer disk temperature value is greater than or equal to the second temperature threshold value, the recovery rate of the refrigerant is increased only slightly and the energy is consumed excessively if the operation frequency of the compressor 111 is increased continuously, so that the operation frequency of the compressor 111 is stopped being increased to prevent the energy from being consumed excessively.
Optionally, in some embodiments of the present application, in step S422, the manner of controlling the compressor 111 to increase the operating frequency is: and controlling the operating frequency of the compressor 111 to increase the preset frequency every third preset time until the pressure value of the container is greater than or equal to the preset pressure value and the temperature value of the outer disc is greater than or equal to the preset temperature value. The value range of the third preset time may be 20s to 30s, in other words, the value of the third preset time may be 20s, 21s, 22s, 23s, 24s, 25s, 26s, 27s, 28s, 29s, 30s, or the like. The predetermined frequency ranges from 1HZ to 3HZ, in other words, the predetermined frequency may be 1HZ, 2HZ, or 3 HZ.
It should be noted that, because the temperature value of the outer disk rises faster in the frequency increasing process of the compressor 111, the interval time of the frequency increasing is set longer, so that the refrigerant recovery system 1 can be prevented from being out of order due to sudden rise of the temperature of the outer disk, in other words, the value of the third preset time is greater than the second preset time.
It should be understood that in other embodiments of the present application, the frequency of the compressor 111 may be controlled to be increased in other manners, for example, the operating frequency of the compressor 111 is controlled to be continuously increased within 20s until the operating frequency of the compressor 111 is increased by 10HZ, and the like.
S423, controlling the compressor 111 to operate at the adjusted operating frequency for the first preset time, and returning to step S41 until the pressure value of the container is within the interval defined by the first pressure threshold and the second page.
Optionally, the value of the first preset time may be in a range of 1min to 2min, in other words, the value of the first preset time may be 1min, 1.1min, 1.2min, 1.3min, 1.4min, 1.5min, 1.6min, 1.7min, 1.8min, 1.9min, 2min, or the like. By controlling the compressor 111 to continuously operate for the first preset time and then returning to the step S41, it can be ensured that the operation state of the compressor 111 is stable, and thus the relationship between the container pressure value and the outer disc temperature value and the preset pressure value and the preset temperature value is performed, and the control accuracy can be improved.
It is worth noting that the controller re-acquires the vessel pressure value and the outer disc temperature value before returning to perform step S41.
In other words, after the operation frequency of the compressor 111 is increased or decreased in step S421 or step S422, in order to ensure that the container pressure value approaches the preset pressure value, thereby achieving effective increase of the refrigerant recovery speed and preventing excessive consumption of energy, the operation returns to step S41 to determine whether the container pressure value falls within the interval defined by the first pressure threshold and the second pressure threshold, so as to adjust the operation frequency of the compressor 111 again if the container pressure value or the outer disc temperature value is not in the specified interval.
Optionally, referring to fig. 7, fig. 7 shows a partial flowchart of a refrigerant recovery control method provided in an embodiment of the present application, in some embodiments of the present application, in order to prevent the compressor 111 from malfunctioning due to frequent fluctuation of the operating frequency of the compressor 111, the refrigerant recovery control method may further include:
s424, counting when the compressor 111 is controlled to complete one operation frequency increase and complete one operation frequency decrease.
It should be noted that, if the operation frequency is raised once, the step S421 is executed once; similarly, completing the operation frequency reduction once refers to completing the execution of step S422 once. In other words, in the case where step S421 is performed once and step S422 is performed once, the controller performs counting once. This one count indicates that the operating frequency of the compressor 111 exhibits sequentially higher and lower fluctuations.
And step S425, when the count reaches the preset number, controlling the compressor 111 to operate at the operation frequency after the operation frequency is increased by controlling the compressor 111 next time until the recovery of the refrigerant is completed.
In other words, when the count reaches the preset number of times, indicating that the compressor 111 has completed the execution of the steps S421 and S422 a plurality of times, resulting in a fluctuation of the operation frequency of the compressor 111 a plurality of times, in order to prevent frequent fluctuation of the operation frequency of the compressor 111, the refrigerant recovery control method may be controlled to terminate the cycle of the steps S421 to S423 when the count reaches the preset number of times, so that the operation of the compressor 111 is controlled at the operation frequency after the next execution of the step S421. Optionally, the value of the preset number of times may be 1, 2, 3, 4, 5, 6, or 7, and the like.
The operation frequency after the next step S421 is executed to control the operation of the compressor 111, which not only can prevent the operation frequency of the compressor 111 from frequently fluctuating, but also can ensure that the refrigerant recovery speed reaches the optimal recovery speed to recover the refrigerant, thereby achieving the purpose of effectively increasing the refrigerant recovery speed.
It should be understood that, in other embodiments of the present application, the settings of step S424 to step S425 may also be cancelled.
Of course, with continued reference to fig. 5, after step S41, step S4 further includes:
s43, if the pressure value of the container is within the interval defined by the first pressure threshold and the second pressure threshold, controlling the compressor 111 to maintain the current operating frequency until the refrigerant recovery is completed.
If the pressure value of the container is greater than or equal to the first pressure threshold value and less than or equal to the second pressure threshold value, the pressure value of the container is located in an interval defined by the first pressure threshold value and the second pressure threshold value.
It should be noted that, if the pressure value of the container is located in the interval defined by the first pressure threshold and the second pressure threshold, it indicates that the pressure value of the container approaches the preset pressure value; correspondingly, the temperature value of the outer disk also approaches the preset temperature value. As can be seen from fig. 3 and 4, the refrigerant recovery rate is substantially optimal at this time, and there is no case where the energy is excessively consumed due to the high operation frequency of the compressor 111. Therefore, the operation of the compressor 111 can be controlled according to the operation frequency at this time until the recovery of the refrigerant is completed.
In summary, the refrigerant recovery control method provided in the embodiment of the present application may increase the recovery rate of the refrigerant according to the operation frequency of the compressor 111 during the recovery of the refrigerant in the system 14 by the refrigerant recovery system 1, and at the same time, may change the pressure in the recovery vessel 15 and the temperature of the outer plate of the heat exchanger 112. However, when the pressure inside the recovery container 15 reaches a certain value and the temperature of the outer plate of the heat exchanger 112 reaches a certain value, the recovery rate of the refrigerant is significantly increased even if the operating frequency of the compressor 111 is continuously increased. Based on this, the operation frequency of the compressor 111 can be controlled according to the pressure inside the recovery container 15 and the temperature of the outer plate of the heat exchanger 112, and the operation frequency of the compressor 111 can be ensured not to be too high to cause energy waste while the refrigerant recovery speed is increased. Therefore, the refrigerant recovery control method provided by the invention can improve the recovery efficiency of the refrigerant, can also improve the utilization rate of energy, and solves the technical problem that energy is not beneficial to energy conservation due to excessive energy consumption. Meanwhile, the operation frequency of the compressor 111 can be adjusted cyclically, so that the pressure value of the container can approach the preset pressure value, and the control precision can be improved.
Based on the refrigerant recovery system 1, please refer to fig. 8, fig. 8 shows a schematic block diagram of functional modules of a refrigerant recovery device provided in the embodiment of the present application. In order to execute the refrigerant recovery control method, the embodiment of the application also provides a refrigerant recovery control device. The refrigerant recovery control device includes a first receiving module 100, a second receiving module 200, and a control module 300.
A first receiving module 100 for receiving a vessel pressure value, the vessel pressure value being indicative of the pressure within the recovery vessel 15.
Optionally, the first receiving module 100 is configured to execute step S2 in the above-mentioned respective diagrams to achieve the corresponding technical effect.
And a second receiving module 200 for receiving an outer disk temperature value, which represents the temperature of the outer disk of the heat exchanger 112.
Optionally, the second receiving module 200 is configured to execute step S3 in the above-mentioned respective diagrams to achieve a corresponding technical effect.
It should be noted that the first receiving module 100 and the second receiving module 200 may be the same functional module.
The control module 300 is configured to control the compressor 111 to determine an operating frequency according to the container pressure value and the outer disc temperature value, so that the container pressure value approaches a preset pressure value.
Optionally, the control module 300 is configured to execute step S4 and its sub-steps in the above-mentioned figures to achieve the corresponding technical effect.
It should be noted that the control module 300 is further configured to execute steps S1, S11, and S424 to S425 in the above-mentioned figures to achieve the corresponding technical effects.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A refrigerant recovery control method is applied to a refrigerant recovery system (1), the refrigerant recovery system (1) comprises a first recovery pipeline (11), one end of the first recovery pipeline (11) is connected to a system (14) to be recovered, and the other end of the first recovery pipeline is connected to a recovery container (15); a compressor (111) and a heat exchanger (112) are arranged on the first recovery pipeline (11), the compressor (111) is used for extracting gaseous refrigerant in the system (14) to be recovered when in operation, and guiding the refrigerant to the heat exchanger (112); the refrigerant passing through the heat exchanger (112) is introduced into the recovery tank (15), characterized by comprising:
receiving a vessel pressure value representing a pressure inside the recovery vessel (15);
receiving an outer disc temperature value representing a temperature of an outer disc of the heat exchanger (112);
and controlling the compressor (111) to determine the operating frequency according to the container pressure value and the outer disc temperature value, so that the container pressure value approaches a preset pressure value.
2. The refrigerant recovery control method according to claim 1, wherein the step of controlling the compressor (111) to determine an operating frequency in accordance with the vessel pressure value and the outer disc temperature value such that the vessel pressure value approaches the preset pressure value comprises:
judging whether the container pressure value is within an interval defined by a first pressure threshold and a second pressure threshold and whether the outer disc temperature value is within an interval defined by a first temperature threshold and a second temperature threshold;
if the pressure value of the container is not within the interval defined by the first pressure threshold value and the second pressure threshold value, or,
if the temperature value of the outer disc is not in the interval defined by the first temperature threshold value and the second temperature threshold value, controlling the compressor (111) to increase or decrease the operation frequency so as to enable the pressure value of the container to approach the preset pressure value;
if the container pressure value is in the interval defined by the first pressure threshold value and the second pressure threshold value, controlling the compressor (111) to maintain the current operating frequency until the refrigerant recovery is finished;
the first pressure threshold value is obtained by subtracting a first preset value from a preset pressure value, the second pressure threshold value is obtained by adding a second preset value to the preset pressure value, and the first pressure threshold value is smaller than the second pressure threshold value; the first temperature threshold is obtained by subtracting a third preset value from a preset temperature value, the second temperature threshold is obtained by adding a fourth preset value to the preset temperature value, and the first temperature threshold is smaller than the second temperature threshold.
3. The refrigerant recovery control method according to claim 2, wherein the step of controlling the compressor (111) to increase or decrease the operating frequency so that the tank pressure value approaches the preset pressure value, if the tank pressure value is not within an interval defined by a first pressure threshold value and a second pressure threshold value, or if the outer disc temperature value is not within an interval defined by a first temperature threshold value and a second temperature threshold value, comprises:
if the container pressure value is greater than the second pressure threshold value, or the outer disc temperature value is greater than the second temperature threshold value, controlling the compressor (111) to reduce the operating frequency until the container pressure value is less than or equal to the preset pressure value and the outer disc temperature value is less than or equal to the preset temperature value;
if the container pressure value is smaller than the first pressure threshold value, or the outer disc temperature value is smaller than the first temperature threshold value, controlling the compressor (111) to increase the operating frequency until the container pressure value is larger than or equal to the preset pressure value and the outer disc temperature value is larger than or equal to the preset temperature value;
and controlling the compressor (111) to operate for a first preset time at the adjusted operating frequency, and returning to the step of judging whether the container pressure value is located in an interval defined by a first pressure threshold and a second pressure threshold and whether the outer disc temperature value is located in an interval defined by a first temperature threshold and a second temperature threshold until the container pressure value is located in the interval defined by the first pressure threshold and the second pressure threshold.
4. The refrigerant recovery control method according to claim 3, further comprising:
counting when controlling the compressor (111) to finish raising the operation frequency once and finish lowering the operation frequency once;
and when the counting reaches the preset times, controlling the compressor (111) to operate at the operating frequency after the compressor (111) finishes increasing the operating frequency for the next time until the recovery of the refrigerant is finished.
5. The refrigerant recovery control method according to claim 3, wherein the step of controlling the compressor (111) to decrease the operating frequency until the vessel pressure value is less than or equal to the preset pressure value and the outer disc temperature value is less than or equal to the preset temperature value comprises:
controlling the running frequency of the compressor (111) to reduce a preset frequency every second preset time until the pressure value of the container is less than or equal to the preset pressure value and the temperature value of the outer disc is less than or equal to the preset temperature value;
the step of controlling the compressor (111) to increase the operating frequency until the container pressure value is greater than or equal to the preset pressure value and the outer disc temperature value is greater than or equal to the preset temperature value comprises the steps of:
and controlling the running frequency of the compressor (111) to increase a preset frequency every third preset time until the pressure value of the container is greater than or equal to the preset pressure value and the temperature value of the outer disc is greater than or equal to the preset temperature value.
6. Refrigerant recovery control method according to claim 3, characterized in that the ratio of the preset pressure value to the nominal withstand pressure of the recovery vessel (15) is 0.6-0.8.
7. The refrigerant recovery control method according to any one of claims 1 to 6, wherein the refrigerant recovery system (1) further includes a second recovery line (12) and a recovery branch (13);
one end of the second recovery pipeline (12) is connected to the bottom of the system to be recovered (14), and the other end of the second recovery pipeline is connected to the recovery container (15); a second switch valve (121) is arranged on the second recovery pipeline (12); one end of the recovery branch (13) is connected to the second recovery pipeline (12) between the second switch valve (121) and the system to be recovered (14), and the other end is connected to the first recovery pipeline (11) between the compressor (111) and the heat exchanger (112); a third on-off valve (131) is arranged on the recovery branch (13);
before receiving the vessel pressure value, the refrigerant recovery control method further includes:
-receiving a front end pressure value representative of the refrigerant pressure in the first recovery line (11) between the compressor (111) and the recovery branch (13), and a rear end pressure value representative of the refrigerant pressure in the first recovery line (11) between the heat exchanger (112) and the recovery branch (13);
and if the difference value between the front end pressure value and the rear end pressure value is smaller than or equal to a preset difference value, controlling the second switch valve (121) and the third switch valve (131) to be closed, and then executing the step of receiving the container pressure value.
8. The refrigerant recovery control method according to claim 7, characterized in that the refrigerant recovery system (1) further includes a nitrogen device (16); the output end of the nitrogen device (16) is connected to the system (14) to be recovered;
and when the difference value between the front end pressure value and the rear end pressure value is smaller than or equal to a preset difference value, controlling the nitrogen device (16) to be opened so as to fill nitrogen into the system to be recovered (14).
9. The refrigerant recovery control device is applied to a refrigerant recovery system (1), the refrigerant recovery system (1) comprises a first recovery pipeline (11), one end of the first recovery pipeline (11) is connected to a system (14) to be recovered, and the other end of the first recovery pipeline is connected to a recovery container (15); a compressor (111) and a heat exchanger (112) are arranged on the first recovery pipeline (11), the compressor (111) is used for extracting gaseous refrigerant in the system (14) to be recovered when in operation, and guiding the refrigerant to the heat exchanger (112); the refrigerant that has passed through the heat exchanger (112) is introduced into the recovery tank (15), and the refrigerant recovery system is characterized by comprising:
a first receiving module (100) for receiving a vessel pressure value representing a pressure inside the recovery vessel (15);
a second receiving module (200) for receiving an outer disc temperature value, the outer disc temperature value being indicative of a temperature of an outer disc of the heat exchanger (112);
and the control module (300) is used for controlling the compressor (111) to determine the running frequency according to the container pressure value and the outer disc temperature value, so that the container pressure value approaches to a preset pressure value.
10. A refrigerant recovery system, comprising:
a first recovery pipeline (11), wherein one end of the first recovery pipeline (11) is connected to a system (14) to be recovered, and the other end of the first recovery pipeline is connected to a recovery container (15); a compressor (111) and a heat exchanger (112) are arranged on the first recovery pipeline (11), the compressor (111) is used for extracting gaseous refrigerant in the system (14) to be recovered when in operation, and guiding the refrigerant to the heat exchanger (112); the refrigerant passing through the heat exchanger (112) is introduced into the recovery container (15);
a pressure detection device (151) provided in the recovery container (15) to detect a pressure inside the recovery container (15);
the temperature detection device (1121) is arranged on the heat exchanger (112) and used for detecting the temperature of an outer disc of the heat exchanger (112);
a controller electrically connected to both the pressure detection device (151) and the temperature detection device (1121) and configured to perform the refrigerant recovery control method according to any one of claims 1 to 8.
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| WO2020220989A1 (en) * | 2019-04-28 | 2020-11-05 | 青岛海尔智能技术研发有限公司 | Freezer device, refrigeration system, and control method therefor |
| CN114198954A (en) * | 2021-12-21 | 2022-03-18 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery unit |
| CN114353401A (en) * | 2021-12-21 | 2022-04-15 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020220989A1 (en) * | 2019-04-28 | 2020-11-05 | 青岛海尔智能技术研发有限公司 | Freezer device, refrigeration system, and control method therefor |
| CN114198954A (en) * | 2021-12-21 | 2022-03-18 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery unit |
| CN114353401A (en) * | 2021-12-21 | 2022-04-15 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery system |
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