Refrigerant recovery system and control method

Abstract

This invention belongs to the field of air conditioner technology and discloses a refrigerant recovery system and control method. The refrigerant recovery system includes a refrigerant outlet pipe for connection to the refrigeration equipment to be recovered, and a first flow path and a second flow path connected in parallel at the outlet end of the refrigerant outlet pipe. The first and second flow paths are configured such that a first valve is open and a second valve is closed. A detection component can detect the saturation pressure value of the refrigerant flowing into the first flow path. When the refrigerant recovery system is in recovery mode, the first valve is closed and the second valve is open, and the recovery component can recover the refrigerant flowing into the second flow path. By connecting the first and second flow paths in parallel, the type and purity of the refrigerant can be quickly and easily identified and recovered during the recovery process. This avoids recovering refrigerants with extremely low purity or of different types into the same storage tank, thereby improving the purity of the refrigerant to be recovered and increasing the refrigerant recovery efficiency.

Description

Technical Field

[0001] This invention relates to the field of refrigerant recovery technology, and in particular to a refrigerant recovery system and control method. Background Art

[0002] Currently, in the relevant technologies for refrigerant recovery, refrigerants can be recovered using equipment such as portable recovery machines, recovery purification machines, and recovery filling machines. However, during the refrigerant recovery process, there are usually multiple refrigerants. The relevant recovery equipment can easily recover refrigerants with extremely low purity or different types into the same storage tank, which increases the difficulty of handling the recovered refrigerants and reduces the recovery efficiency of the equipment.

[0003] Portable refrigerant analyzers and other recycling equipment that can identify refrigerants primarily utilize non-dispersive infrared spectroscopy (NDIR) technology. However, because portable refrigerant analyzers are complex in principle, expensive, and can only identify a limited number of refrigerants, they cannot achieve rapid and simple identification and recycling of multiple types of refrigerants during the recycling process. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that existing recycling equipment cannot quickly and easily identify and recycle various types of refrigerants. To address this, a refrigerant recycling system and control method are provided.

[0005] This invention aims to provide a refrigerant recovery system, comprising:

[0006] Refrigerant outlet piping used for connection to refrigeration equipment to be recycled;

[0007] The first and second flow paths are connected in parallel at the outlet end of the refrigerant outlet pipe;

[0008] The first flow path includes a detection component and a first valve. The detection component is located downstream of the first valve and is used to detect the saturation pressure value of the refrigerant flowing into the first flow path.

[0009] The second flow path includes a recovery component and a second valve. The recovery component is located downstream of the second valve and is used to recover the refrigerant flowing into the second flow path.

[0010] The refrigerant recovery system is in detection mode. The first flow path and the second flow path are set with the first valve open and the second valve closed. The detection component can detect the saturation pressure value of the refrigerant flowing into the first flow path.

[0011] The refrigerant recovery system is in recovery mode, with the first valve closed and the second valve open, allowing the recovery components to recover the refrigerant flowing into the second flow path.

[0012] In some embodiments, the detection component includes:

[0013] The temperature control room contains a first chamber, which in turn contains temperature control components and a detection chamber.

[0014] Among them, the temperature control component is used to maintain a constant temperature value in the temperature control room;

[0015] The detection chamber has a second chamber that is connected to the first flow path. The detection chamber is equipped with a sensor group, which includes a temperature sensor and a pressure sensor, for detecting the temperature and pressure values ​​of the refrigerant in the detection chamber.

[0016] In some embodiments, the testing chamber includes:

[0017] The controller, wherein the temperature sensor and the pressure sensor are electrically connected to the controller respectively;

[0018] The controller is configured to: when the temperature value detected by the temperature sensor reaches a preset temperature value, control the pressure sensor to detect the saturation pressure value of the refrigerant in the second chamber.

[0019] In some embodiments, the temperature control component includes a heating element and a first fan;

[0020] It is located on the side of the testing chamber away from the first valve.

[0021] In some embodiments, the recycling component includes:

[0022] The refrigerant is transported to the receiving section, which is located downstream of the transport section.

[0023] In some embodiments, the transmission unit includes:

[0024] The compressor and condenser are located downstream of the compressor.

[0025] The second fan is used to cool the condenser.

[0026] In some embodiments, the accommodating portion includes:

[0027] The third valve is located downstream of the condenser.

[0028] Storage tank, located downstream of the third valve;

[0029] The third valve is a check valve.

[0030] In some embodiments, the refrigerant recovery system further includes:

[0031] The purification component is located in the refrigerant outlet pipeline.

[0032] In some embodiments, a control method is provided for controlling a refrigerant recovery system as described above, the control method comprising:

[0033] Control the first valve to open the first flow path, and control the second valve to block the second flow path;

[0034] The control and detection components acquire the saturation pressure value of the refrigerant;

[0035] Determine whether the deviation between the refrigerant's saturation pressure value and the preset saturation pressure value exceeds the preset deviation range;

[0036] If so, if it is determined that the refrigerant does not meet the requirements for the type of target refrigerant and / or the purity of the target refrigerant, the first valve is controlled to block the first flow path, and the detection and recovery of refrigerant is stopped;

[0037] If not, determine that the refrigerant meets the target refrigerant type requirement and / or the target refrigerant purity requirement, control the first valve to block the first flow path, control the second valve to open the second flow path, control the refrigerant to flow into the second flow path, and control the recovery component to recover the refrigerant.

[0038] In some embodiments, a control method is provided for controlling a refrigerant recovery system as described above, the control method comprising:

[0039] Control the refrigerant as it passes through the purification components;

[0040] Control the first valve to open the first flow path, and control the second valve to block the second flow path;

[0041] The temperature control components are activated to raise the temperature of the testing chamber.

[0042] The sensor array is controlled to operate and acquire the refrigerant temperature value in the second chamber.

[0043] Determine whether the refrigerant temperature in the second chamber is equal to the preset temperature value;

[0044] If not, it is determined that the refrigerant has not reached the condition for detecting the saturation pressure value, and the sensor group repeatedly acquires the refrigerant temperature value in the second chamber;

[0045] If so, determine that the refrigerant has reached the detection saturation pressure value, and control the sensor group to obtain the saturation pressure value of the refrigerant in the second chamber;

[0046] The temperature control components are stopped working.

[0047] Determine whether the initial deviation range between the refrigerant saturation pressure value in the second chamber and the preset saturation pressure value is greater than the preset deviation range;

[0048] If so, if it is determined that the refrigerant does not meet the requirements for the type of target refrigerant and / or the purity of the target refrigerant, the first valve is controlled to block the first flow path, and the detection and recovery of refrigerant is stopped;

[0049] If not, determine that the refrigerant meets the type requirement and / or purity requirement of the target refrigerant, control the first valve to block the first flow path, control the second valve to open the second flow path, and control the transmission unit to transport the refrigerant to the container.

[0050] In some embodiments, the preset temperature value is 40°C, and the preset deviation range is 5%.

[0051] The technical solution provided by this invention has the following advantages compared with the prior art:

[0052] By connecting the first and second flow paths in parallel, the refrigerant recovery system can determine whether the refrigerant to be recovered is the target refrigerant by detecting its saturation pressure value before recovery. This avoids recovering refrigerants that do not meet the requirements, thereby enabling rapid and easy identification and recovery of multiple types of refrigerants during the recovery process. It also prevents refrigerants with extremely low purity or different types from being recovered into the same storage tank, reducing the difficulty of handling the recovered refrigerant and improving the refrigerant recovery efficiency. Attached Figure Description

[0053] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0054] Figure 1 This is a schematic diagram of the flow path of the refrigerant recovery system shown in an embodiment of the present invention;

[0055] Figure 2 This is one of the flowcharts of the control method shown in the embodiments of the present invention;

[0056] Figure 3 This is a second flowchart of the control method shown in the embodiments of the present invention;

[0057] Figure 4 This is the third flowchart of the control method shown in the embodiment of the present invention.

[0058] In the diagram: 10-Refrigerant recovery system, 100-First flow path, 110-Detection component, 112-Temperature control chamber, 114-Temperature control component, 116-Heating element, 118-First fan, 120-Detection chamber, 122-Second chamber, 126-Sensor, 128-Temperature sensor, 130-Pressure sensor, 140-First valve, 142-Controller, 200-Second flow path, 210-Recovery component, 212-Transfer section, 214-Compressor, 216-Condenser, 218-Second fan, 220-Containment section, 222-Third valve, 224-Storage tank, 240-Second valve, 300-Purification component, 310-Filter section, 312-Filter outlet, 400-Refrigerant outlet pipeline.

[0059] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0060] In the description of this invention, it should be noted that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0061] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "contact," and "communication" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] In refrigerant recovery technologies, the recovery equipment cannot quickly and easily identify and recover multiple types of refrigerants during the recovery process. This makes it easy for the equipment to recover refrigerants with extremely low purity or of different types into the same storage tank, thereby increasing the difficulty of refrigerant disposal and reducing the recovery efficiency of the equipment.

[0063] Based on this technical problem, the following embodiments are proposed.

[0064] Example 1

[0065] like Figure 1 As shown, a refrigerant recovery system 10 is characterized by comprising:

[0066] 400 is a refrigerant outlet line for connection to the refrigeration equipment to be recycled;

[0067] The first flow path 100 and the second flow path 200 are connected in parallel to the outlet end of the refrigerant outlet pipe 400.

[0068] A first flow path 100 includes a detection component 110 and a first valve 140. The detection component 110 is located downstream of the first valve 140 and is used to detect the saturation pressure value of the refrigerant flowing into the first flow path 100.

[0069] The second flow path 200 includes a recovery component 210 and a second valve 240. The recovery component 210 is located downstream of the second valve 240 and is used to recover the refrigerant flowing into the second flow path 200.

[0070] The refrigerant recovery system is in detection mode, and the first flow path 100 and the second flow path 200 are set such that the first valve 140 is open and the second valve 240 is closed. The detection component 110 is able to detect the saturation pressure value of the refrigerant flowing into the first flow path 100.

[0071] The refrigerant recovery system is in recovery mode, with the first valve 140 closed and the second valve 240 open, and the recovery component 210 capable of recovering the refrigerant flowing into the second flow path 200.

[0072] In this embodiment, as Figure 1As shown, the refrigerant recovery system 10 includes a refrigerant outlet pipe 400 for connection to the refrigeration equipment to be recovered, a first flow path 100, and a second flow path 200. After the refrigerant recovery system 10 is connected to the refrigeration equipment to be recovered, the refrigerant in the refrigeration equipment to be recovered can flow into the refrigerant recovery system 10 through the refrigerant outlet pipe 400 and flow in the first flow path 100 and the second flow path 200 respectively. The first flow path 100 includes a detection component 110 and a first valve 140. The detection component 110 is located downstream of the first valve 140, and the refrigerant must first flow through the first valve 140 before entering the detection component 110. The second flow path 200 includes a recovery component 210 and a second valve 240. The recovery component 210 is located downstream of the second valve 240, and the refrigerant must first flow through the second valve 240 before entering the recovery component 210. By connecting the first flow path 100 and the second flow path 200 in parallel, the refrigerant can flow only in the first flow path 100, only in the second flow path 200, or simultaneously in both. When recovering the refrigerant, it must first be tested to determine if its type and purity meet the recovery requirements. If the test confirms that the type and purity of the refrigerant meet the recovery requirements, recovery begins. In testing mode, the first flow path 100 and the second flow path 200 are configured such that the first valve 140 is opened while the second valve 240 is closed. The refrigerant flows into the first flow path 100 through the first valve 140 but is blocked outside the second flow path 200 by the second valve 240, preventing untested refrigerant from being directly recovered by the second flow path 200.

[0073] When the refrigerant flows into the detection component 110, the detection component 110 can detect the saturation pressure value of the refrigerant flowing into it. When the initial deviation between the saturation pressure value of the refrigerant and the preset saturation pressure value is greater than the preset deviation range, it indicates that the purity of the refrigerant to be recovered is low, or that it is different from the type of target refrigerant to be recovered. Therefore, the recovery operation can be terminated directly.

[0074] When the initial deviation range between the refrigerant's saturation pressure value and the preset saturation pressure value is within the preset deviation range, it indicates that the type and purity of the refrigerant to be recovered meet the recovery requirements of the target refrigerant, and the recovery mode is initiated. At this time, the first flow path 100 and the second flow path 200 are configured as follows: the second valve 240 is opened, allowing the refrigerant to flow into the second flow path 200 through the second valve 240, and the recovery component 210 recovers and stores the refrigerant.

[0075] By connecting the first flow path 100 and the second flow path 200 in parallel, the refrigerant recovery system 10 can determine the type and purity of the refrigerant to be recovered by detecting its saturation pressure value before recovery. This avoids recovering refrigerants that do not meet the requirements, thereby enabling quick and easy identification and recovery of the type and purity of the refrigerant during the recovery process. It also avoids recovering refrigerants with extremely low purity or different types into the same storage tank, thus improving the purity of the refrigerant to be recovered, reducing the difficulty of handling the recovered refrigerant, and improving the refrigerant recovery efficiency.

[0076] Preferably, in the recovery mode, the first valve 140 can also be closed to prevent the refrigerant from experiencing a pressure drop due to diversion after flowing into the refrigerant recovery system 10, so that the refrigerant can maintain a stable state in the recovery mode and further improve the recovery efficiency.

[0077] Preferably, the refrigerant to be recovered flows into the first flow path 100 and / or the second flow path 200 in a liquid state.

[0078] Preferably, the types of refrigerants that the refrigerant recovery system 10 can identify and process include: R22, R32, R410A, R134a, R290, R600a, etc.

[0079] Optionally, in one implementation of this embodiment, such as Figure 1 As shown, the detection component 110 includes:

[0080] Temperature control chamber 112, wherein a first chamber is provided in the temperature control chamber 112, and a temperature control component 114 and a detection chamber 120 are provided in the first chamber;

[0081] The temperature control component 114 is used to maintain a constant temperature value inside the temperature control chamber 112;

[0082] The detection chamber 120 has a second chamber 122, which is connected to the first flow path. The detection chamber 120 is equipped with a sensor group 126, which includes a temperature sensor 128 and a pressure sensor 130, for detecting the temperature and pressure values ​​of the refrigerant in the detection chamber 120.

[0083] In this embodiment, as Figure 1As shown, the detection assembly 110 includes a temperature control chamber 112, which has a first chamber. A temperature control component 114 and a detection chamber 120 are respectively disposed within the first chamber. When refrigerant flows into the detection assembly 110, it first passes through the temperature control chamber 112 into the first chamber, and then enters the detection chamber 120. The temperature control component 114 can control the temperature value within the first chamber, and thus adjust the temperature value within the detection chamber 120 through heat exchange, so that the temperature value within the detection chamber 120 can be kept essentially constant, maintaining it within the temperature range required for detection. The detection chamber 120 includes a second chamber 122 and a sensor group 126. The sensor group 126 is disposed within the second chamber 122. In detection mode, refrigerant flows into the second chamber 122 and comes into contact with the sensor group 126. The sensor group 126 includes a temperature sensor 128 and a pressure sensor 130. In the detection mode, both the temperature sensor 128 and the pressure sensor 130 obtain the temperature value data and saturation pressure value data of the refrigerant by contacting the refrigerant.

[0084] By setting up a temperature control chamber 112 and installing a temperature sensor 128 and a pressure sensor 130 in the sensor group 126, the detection chamber 120 can maintain the temperature range required for detection to detect the saturation pressure of the refrigerant, thereby making the detection results more accurate and avoiding misjudgment.

[0085] Optionally, in one implementation of this embodiment, such as Figure 1 As shown, the detection chamber 120 includes:

[0086] The temperature sensor 128 and the pressure sensor 130 are electrically connected to the controller 142.

[0087] The controller 142 is configured to: when the temperature value detected by the temperature sensor 128 reaches a preset temperature value, control the pressure sensor 130 to detect the saturation pressure value of the refrigerant in the second chamber 122.

[0088] In this embodiment, as Figure 1 As shown, the detection chamber 120 also includes a controller 142. The temperature sensor 128 and the pressure sensor 130 are electrically connected to the controller 142, so that the temperature sensor 128 and the pressure sensor 130 can both transmit signals to the controller 142 and receive signals from the controller 142.

[0089] The preset program in the controller 142 is set as follows: when the temperature sensor 128 detects that the refrigerant in the second chamber 122 has reached the preset temperature value, it transmits the data signal to the controller 142. After receiving the data signal from the temperature sensor 128, the controller 142 sends a detection command to the pressure sensor 130. After receiving the detection command from the controller, the pressure sensor 130 detects the saturation pressure value of the refrigerant in the second chamber 122.

[0090] When the pressure sensor 130 detects that the initial deviation between the saturation pressure value of the refrigerant in the second chamber 122 at the preset temperature value and the preset saturation pressure value is greater than the preset deviation range, it is considered that the purity of the refrigerant is low or that it is different from the type of target refrigerant that needs to be recovered. At this time, the recovery can be stopped.

[0091] When the pressure sensor 130 detects that the initial deviation between the saturation pressure value of the refrigerant in the second chamber 122 at the preset temperature value and the preset saturation pressure value is within the preset deviation range, it indicates that the refrigerant to be recovered is the target refrigerant that needs to be recovered, and the recovery mode can be entered at this time.

[0092] By electrically connecting the temperature sensor 128 and the pressure sensor 130 to the controller 142, the pressure sensor 130 can detect the saturation pressure of the refrigerant only after the refrigerant has reached the preset temperature value. This prevents the pressure sensor 130 from detecting the saturation pressure of the refrigerant before it has reached the preset temperature value, thereby further reducing the risk of misjudgment in the detection mode.

[0093] Optionally, in one implementation of this embodiment, such as Figure 1 As shown, the temperature control assembly includes a heating element 116 and a first fan 118;

[0094] It is located on the side of the detection chamber 120 away from the first valve 140.

[0095] In this embodiment, as Figure 1As shown, the temperature control assembly 114 includes a heating element 116 and a first fan 118. Positioning the heating element 116 on the side of the detection chamber 120 away from the first valve 140 shortens the refrigerant's flow distance, allowing the refrigerant to enter the detection chamber 120 more quickly. This side of the detection chamber 120 away from the first valve 140 is designated A. The first fan 118 can be positioned on the side of the heating element 116 away from the detection chamber 120 to heat the chamber. This side of the heating element 116 away from the detection chamber 120 is designated B. The first fan 118 can be positioned facing the heating element 116, allowing the airflow from the first fan 118 to pass through the heating element 116 and ultimately reach the detection chamber 120 to heat it. This direction towards the heating element 116 is designated C. When the temperature value of the detection chamber 120 does not meet the detection conditions, the heating element 116 starts to heat the temperature control chamber 112, and at the same time the first fan 118 turns on to blow the hot airflow generated around the heating element 116 toward the detection chamber 120, so that the detection chamber 120 can quickly reach the preset temperature value that meets the detection conditions, and complete the detection of the refrigerant saturation pressure value at the preset temperature value.

[0096] Preferably, the temperature control component 114 can use the PID (Proportional-Integral-Derivative) adjustment algorithm to control the temperature value of the detection chamber 120. The comparison temperature set by the temperature control component 114 is generally higher than the room temperature, such as 40°C. When the temperature value of the temperature control component 114 deviates from the set comparison temperature value by more than 1°C, the heating power of the heating element 116 and the fan speed of the first fan 118 can be adjusted to bring the temperature value of the temperature control component 114 within 1°C of the set comparison temperature value. At this point, a stable state is considered to have been reached, and the saturation pressure value of the refrigerant can be detected.

[0097] By setting the temperature control component 114, the temperature control component 114 can adjust the temperature value of the detection chamber 120, which can make the refrigerant in the detection chamber 120 reach the preset temperature value more quickly, so that the detection chamber 120 can detect the saturation pressure value of the refrigerant, thereby further improving the operating efficiency of the refrigerant recovery system 10.

[0098] Optionally, in one implementation of this embodiment, such as Figure 1 As shown, the recycling component 210 includes a transport section 212 and a receiving section 220. The receiving section 220 is located downstream of the transport section 212, and the transport section 212 is capable of transporting refrigerant to the receiving section 220.

[0099] In this embodiment, as Figure 1As shown, the recovery assembly 210 includes a conveying section 212 and a receiving section 220. The conveying section 212 is located downstream of the second valve 240, and the refrigerant flows into the conveying section 212 after passing through the second valve 240. The conveying section 212 provides power for the flow of the refrigerant. The receiving section 220 is located downstream of the conveying section 212. After flowing through the conveying section 212, the refrigerant is transported to the receiving section 220, where it is stored. In recovery mode, after flowing into the recovery assembly 210, the refrigerant first flows through the conveying section 212, which provides power to propel the refrigerant downstream, ultimately allowing it to flow into the receiving section 220 for storage. In recovery mode, this refrigerant recovery system 10 can rapidly recover and store the refrigerant using the power provided by the conveying section 212. Compared to other non-powered recovery methods, the transmission unit 212 can increase the refrigerant recovery speed of the refrigerant recovery system 10, thereby further improving the refrigerant recovery efficiency of the refrigerant recovery system 10.

[0100] Optionally, in one implementation of this embodiment, such as Figure 1 As shown, the transmission unit 212 includes a compressor 214 and a condenser 216, with the condenser 216 located downstream of the compressor 214;

[0101] The second fan 218 is used to cool the condenser 216.

[0102] In this embodiment, as Figure 1 As shown, the transmission unit 212 includes a compressor 214, a condenser 216, and a second fan 218. The compressor 214 is connected downstream of the second valve 240. When the refrigerant flows through the second valve 240, it flows into the compressor 214. The compressor 214 compresses the refrigerant, turning it into a high-temperature, high-pressure vapor, and propels the refrigerant downstream. The condenser 216 is connected downstream of the compressor 214. When the high-temperature, high-pressure refrigerant vapor flows from the compressor 214 into the condenser 216, the second fan 218, located on one side of the heat exchange surface of the condenser 216, blows air onto the condenser 216, cooling it down. The refrigerant in the condenser 216, after cooling, becomes a high-pressure liquid and continues to flow into the container 220. Since the refrigerant in a liquid state has a smaller unit volume than the refrigerant in a gaseous state, the refrigerant flowing into the container 220 in a liquid state allows the container 220 to store a larger quantity of refrigerant, thereby further improving the refrigerant recovery efficiency of the refrigerant recovery system 10.

[0103] Specifically, compressor 214 can be either an oil-free compressor 214 or an oil-containing compressor 214.

[0104] Specifically, if Figure 1 As shown, one side of the heat exchange surface of condenser 216 is D.

[0105] Optionally, in one implementation of this embodiment, such as Figure 1 As shown, the accommodating portion 220 includes:

[0106] The third valve 222 is located downstream of the condenser 216;

[0107] Storage tank 224 is located downstream of the third valve 222;

[0108] Among them, the third valve 222 is a one-way valve.

[0109] In this embodiment, as Figure 1 As shown, the receiving section 220 includes a third valve 222 and a storage tank 224. The third valve 222 is located downstream of the condenser 216, and the refrigerant flows from the transfer section 212 to the third valve 222. The storage tank 224 is located downstream of the third valve 222, and the refrigerant flows into the storage tank 224 after passing through the third valve 222, thus completing the refrigerant recovery. By setting the third valve 222 as a one-way valve, the refrigerant can only continue to flow to the storage tank 224 after passing through the third valve 222 and cannot flow to the second valve 240, avoiding the risk of refrigerant flowing back from the storage tank 224 to the second valve 240 when a sudden power outage or other malfunction causes negative pressure to be generated in the second flow path 200.

[0110] Specifically, the third valve 222 can be a ball check valve, a swing check valve, or a rubber flap check valve, etc.

[0111] Optionally, in one implementation of this embodiment, such as Figure 1 As shown, the refrigerant recovery system 10 also includes:

[0112] Purification component 300 is provided in the refrigerant outlet pipe 400.

[0113] In this embodiment, as Figure 1 As shown, the refrigerant recovery system 10 also includes a purification component 300, which is used to filter impurities in the refrigerant. The purification component 300 is installed in the refrigerant outlet pipe 400, so that the purification component 300 is upstream of the parallel end of the first flow path 100 and the second flow path 200. When the refrigerant recovery system 10 is running, the refrigerant to be recovered needs to first flow into the purification component 300 for filtration, and then be controlled to flow into the first flow path 100 and / or the second flow path 200 respectively.

[0114] By setting up the purification component 300, impurities in the refrigerant flowing into the first flow path 100 and / or the second flow path 200 are reduced. This not only reduces the risk of failure of each component in the detection component 110 and the recovery component 210, but also improves the purity of the refrigerant during the recovery process, thereby further improving the recovery efficiency of the refrigerant recovery system 10.

[0115] Optionally, in one implementation of this embodiment, such as Figure 1 As shown, the purification component 300 includes:

[0116] The filter section 310 is provided with a filter outlet 312.

[0117] In this embodiment, as Figure 1 As shown, the purification assembly 300 includes a filter section 310 with a filter outlet 312. The filtered refrigerant flows from the filter outlet 312 to the first flow path 100 and / or the second flow path 200, respectively. Since the first flow path 100 and the second flow path 200 are connected in parallel, by controlling the first valve 140 and the second valve 240 respectively, the refrigerant flowing out of the filter outlet 312 can either flow into the first flow path 100 only through the first valve 140, flow into the second flow path 200 only through the second valve 240, or flow into the first flow path 100 and the second flow path 200 simultaneously from both valves 140 and 240, to meet the needs of the refrigerant recovery system 10 in different modes.

[0118] Specifically, the filtration unit 310 can be composed of filters with different filtration functions, such as an oil removal filter, a water removal filter, an acid removal filter, and a solid particulate impurity filter, connected in series to meet the purification requirements of refrigerants containing different unknown impurities.

[0119] Example 2

[0120] This embodiment provides a control method, such as Figure 2 As shown, the control method for controlling the refrigerant recovery system as in Example 1 includes:

[0121] Control the first valve 140 to open the first flow path 100, and control the second valve 240 to block the second flow path 200;

[0122] The detection component 110 is controlled to acquire the saturation pressure value of the refrigerant;

[0123] Determine whether the deviation between the refrigerant's saturation pressure value and the preset saturation pressure value exceeds the preset deviation range;

[0124] If so, if it is determined that the refrigerant does not meet the requirements for the type and / or purity of the target refrigerant, the first valve 140 is controlled to block the first flow path 100, and the detection and recovery of the refrigerant is stopped;

[0125] If not, determine that the refrigerant meets the type requirement and / or purity requirement of the target refrigerant, control the first valve 140 to block the first flow path 100, control the second valve 240 to open the second flow path 200, control the refrigerant to flow into the second flow path 200, and control the recovery component 210 to recover the refrigerant.

[0126] In this embodiment, as Figure 2 As shown, this control method is used to control the refrigerant recovery system as described in Embodiment 1. This control method opens the first flow path by controlling the opening of the first valve 140 before recovery, and blocks the second flow path by controlling the closing of the second valve 240. This allows the refrigerant to flow into the first flow path for detection in detection mode, thus preventing the refrigerant from entering the second flow path and being directly recovered without detection. When the refrigerant flows into the detection component in the first flow path, the detection component detects and obtains the saturation pressure value of the refrigerant, and determines whether the deviation range between the obtained saturation pressure value and the preset saturation pressure value is greater than a preset deviation range, in order to proceed to the next step. When the deviation between the obtained refrigerant saturation pressure value and the preset saturation pressure value is greater than the preset deviation range, it indicates that the current refrigerant does not meet the target refrigerant type requirement, the target refrigerant purity requirement, or both the type and purity requirements are not met, and it is not suitable for recycling. At this time, the first valve 140 is closed to block the first flow path, preventing the refrigerant from continuing to flow into the first flow path, and the refrigerant recycling operation is stopped, for example, by diverting the refrigerant to another storage space awaiting disposal. When the deviation between the obtained refrigerant saturation pressure value and the preset saturation pressure value is less than the preset deviation range, it indicates that the current refrigerant meets the target refrigerant type requirement and the target refrigerant purity requirement, and it can be recycled. At this time, the first valve 140 is closed to block the first flow path, preventing the refrigerant from continuing to flow into the first flow path, and the second valve 240 is opened to open the second flow path, allowing the refrigerant to flow into the second flow path, and the recycling component 210 is used to recycle and store the refrigerant.

[0127] Specifically, if Figure 2 As shown, the control method includes:

[0128] Step 202: Control the first valve 140 to open the first flow path 100, and control the second valve 240 to block the second flow path 200;

[0129] Step 204: Control the detection component 110 to acquire the saturation pressure value of the refrigerant;

[0130] Step 206: Determine whether the deviation range between the refrigerant saturation pressure value and the preset saturation pressure value is greater than the preset deviation range;

[0131] Step 208: If so, determine that the refrigerant does not meet the target refrigerant type requirement and / or does not meet the target refrigerant purity requirement, control the first valve 140 to block the first flow path 100, and stop the refrigerant detection and recovery;

[0132] Step 210: If not, determine that the refrigerant meets the type requirement and / or purity requirement of the target refrigerant, control the first valve 140 to block the first flow path 100, control the second valve 240 to open the second flow path 200, control the refrigerant to flow into the second flow path 200, and control the recovery component 210 to recover the refrigerant.

[0133] This embodiment also provides a control method, such as Figure 3 As shown, the control method for controlling the refrigerant recovery system as in Example 1 includes:

[0134] Control the refrigerant as it passes through the purification component 300;

[0135] Control the first valve 140 to open the first flow path 100, and control the second valve 240 to block the second flow path 200;

[0136] The temperature control component 114 is controlled to operate, thereby raising the temperature of the detection chamber 120;

[0137] The sensor group 126 is controlled to operate and the refrigerant temperature value in the second chamber 122 is obtained.

[0138] Determine whether the refrigerant temperature in the second chamber 122 is equal to the preset temperature value;

[0139] If not, it is determined that the refrigerant has not reached the condition for detecting the saturation pressure value, and the sensor group 126 repeatedly acquires the refrigerant temperature value in the second chamber 122;

[0140] If so, if it is determined that the refrigerant has reached the condition for detecting the saturation pressure value, the sensor group 126 is controlled to acquire the saturation pressure value of the refrigerant in the second chamber 122;

[0141] The temperature control component 114 is controlled to stop working;

[0142] Determine whether the initial deviation range between the saturation pressure value of the refrigerant in the second chamber 122 and the preset saturation pressure value is greater than the preset deviation range;

[0143] If so, if it is determined that the refrigerant does not meet the requirements for the type of target refrigerant and / or does not meet the requirements for the purity of the target refrigerant, the first valve 140 is controlled to block the first flow path 100, and the detection and recovery of refrigerant is stopped;

[0144] If not, determine that the refrigerant meets the type requirement and / or purity requirement of the target refrigerant, control the first valve 140 to block the first flow path 100, control the second valve 240 to open the second flow path 200, and control the transmission unit 212 to transport the refrigerant to the receiving unit 220.

[0145] In this embodiment, as Figure 3As shown, this control method is used to control the refrigerant recovery system 10 as described in Embodiment 1. This control method filters out various impurities in the refrigerant by controlling the refrigerant to pass through the purification component 300 before recovery. This reduces the risk of failure in the components of the detection component 110 and the recovery component 210, and also improves the purity of the refrigerant during the recovery process. Next, the first valve 140 is opened while the second valve 240 is closed, allowing the refrigerant to flow into the first flow path 100 for detection in detection mode, thus preventing the refrigerant from entering the second flow path 200 and being directly recovered without being detected. Then, the temperature control component 114 is turned on. The heating element 116 within the temperature control component 114 heats the temperature control chamber 112, and the first fan 118 is turned on. The heating element 116 heats the temperature control chamber 112, and the first fan 118 blows the generated hot airflow towards the detection chamber 120, raising the temperature of the detection chamber 120. At this time, the temperature sensor 128 in the sensor group 126 located in the detection chamber 120 is activated and repeatedly acquires the refrigerant temperature value in the second chamber 122. When the refrigerant temperature value in the second chamber 122 acquired by the temperature sensor 128 is greater than or less than the preset temperature value required for the detection conditions, it indicates that the refrigerant in the second chamber 122 has not yet reached the condition for the detection saturation pressure value. At this time, the heating power of the heating element 116 in the temperature control component 114 or the wind speed of the first fan 118 can be adjusted, or the heating power of the heating element 116 or the wind speed of the first fan 118 can be adjusted simultaneously to make the refrigerant in the second chamber 122 reach the preset temperature value more quickly. When the temperature value of the refrigerant in the second chamber 122 obtained by the temperature sensor 128 is equal to the preset temperature value required for the detection conditions, it indicates that the refrigerant in the second chamber 122 has reached the condition for detecting the saturation pressure value. At this time, the controller 142 sends a signal to the pressure sensor 130, controlling the pressure sensor 130 to obtain the saturation pressure value of the refrigerant in the second chamber 122, and then controls the temperature control component 114 to stop heating, and the detection component 110 stops working at this time. When the initial deviation range between the obtained saturation pressure value of the refrigerant in the second chamber 122 and the preset saturation pressure value is greater than the preset deviation range, it indicates that the refrigerant does not meet the requirements for the type of target refrigerant or the purity requirements of the target refrigerant, or both, and is not suitable for recycling. At this time, the first valve 140 is closed to prevent the refrigerant from continuing to flow into the first flow path 100, and the refrigerant recycling operation is stopped, for example, the refrigerant is diverted to other storage spaces awaiting disposal. When the initial deviation range between the obtained saturation pressure value of the refrigerant in the second chamber 122 and the preset saturation pressure value is greater than the preset deviation range, it indicates that the refrigerant meets the requirements for the type or purity of the target refrigerant and can be recycled. At this time, the first valve 140 is closed to prevent the refrigerant from continuing to flow into the first flow path 100 and the refrigerant recycling operation is stopped. For example, the refrigerant is diverted to other storage spaces awaiting disposal.When the initial deviation of the refrigerant saturation pressure value in the second chamber 122 from the preset saturation pressure value is less than the preset deviation range, it indicates that the refrigerant meets the recovery conditions. At this time, the first valve 140 is closed to prevent the refrigerant from continuing to flow into the detection component 110 and affecting the pressure drop of the refrigerant in the second flow path. At the same time, the second valve is opened to allow the refrigerant to flow into the recovery component 210 for recovery. Then, the compressor 214 located in the transmission section 212 is turned on to compress the refrigerant flowing into the transmission section 212, turning the refrigerant into a high-temperature, high-pressure gaseous state and pushing the refrigerant into the downstream condenser 216. At this time, the second fan 218 is turned on, and the second fan 218 located on the heat exchange surface side of the condenser 216 blows towards the condenser 216 to cool it down. At this time, the refrigerant in the condenser 216 becomes a high-pressure liquid state after cooling and continues to flow into the receiving section 220. At this time, the third valve 222 is opened to allow the refrigerant to enter the storage tank 224. The refrigerant recovery operation is now complete.

[0146] Specifically, if Figure 3 As shown, the control method includes:

[0147] Step 302: Control the refrigerant to pass through the purification component 300;

[0148] Step 304: Control the first valve 140 to open the first flow path 100, and control the second valve 240 to block the second flow path 200;

[0149] Step 306: Control the temperature control component 114 to operate and heat up the detection chamber 120;

[0150] Step 308: Control the sensor group 126 to work and obtain the refrigerant temperature value in the second chamber 122;

[0151] Step 310: Determine whether the refrigerant temperature in the second chamber 122 is equal to the preset temperature value;

[0152] Step 312: If not, it is determined that the refrigerant has not reached the condition for detecting the saturation pressure value, and the sensor group 126 repeatedly acquires the refrigerant temperature value in the second chamber 122;

[0153] Step 314: If yes, determine that the refrigerant has reached the condition for detecting the saturation pressure value, and control the sensor group 126 to acquire the saturation pressure value of the refrigerant in the second chamber 122;

[0154] Step 316: Control the temperature control component 114 to stop working;

[0155] Step 318: Determine whether the initial deviation range between the saturation pressure value of the refrigerant in the second chamber 122 and the preset saturation pressure value is greater than the preset deviation range;

[0156] Step 320: If so, determine that the refrigerant does not meet the target refrigerant type requirement and / or does not meet the target refrigerant purity requirement, control the first valve 140 to block the first flow path 100, and stop the refrigerant detection and recovery;

[0157] Step 322: If not, determine that the refrigerant meets the type requirement and / or purity requirement of the target refrigerant, control the first valve 140 to block the first flow path 100, control the second valve 240 to open the second flow path 200, and control the transmission unit 212 to transport the refrigerant to the receiving unit 220.

[0158] Optionally, in one implementation of this embodiment, such as Figure 4 As shown, the preset temperature value in this control method is 40℃, and the preset deviation range is 5%.

[0159]

[0160]

[0161] Table 1

[0162] Table 1 shows the saturated vapor pressure values ​​of various commonly used refrigerants at 40℃. The saturated vapor pressure values ​​differ for different types of refrigerants. Once the refrigerant reaches a stable state that meets the detection conditions, it is determined whether the saturated pressure value of the refrigerant in the second chamber 122 obtained by the pressure sensor 130 is within the normal pressure range corresponding to the target refrigerant type with a 5% deviation. If it is within the normal pressure range, it is determined that the type and purity of the refrigerant to be recovered meet the recovery requirements of the target refrigerant, and the recovery operation can be carried out. If it is not within the normal pressure range, it is determined that the purity of the refrigerant to be recovered is low, or it is different from the type of target refrigerant to be recovered. At this time, the recovery operation of the refrigerant to be recovered is stopped, and it can be transferred to other storage spaces awaiting disposal.

[0163] In this embodiment, as Figure 4 As shown, the control method presets the deviation range to 5%, thereby making the detection of the refrigerant's saturation pressure value more accurate and improving the accuracy of refrigerant type identification.

[0164] Specifically, if Figure 4 As shown, the control method includes:

[0165] Step 402: Control the refrigerant to pass through the purification component 300;

[0166] Step 404: Control the first valve 140 to open the first flow path 100, and control the second valve 240 to block the second flow path 200;

[0167] Step 406: Control the temperature control component 114 to operate and raise the temperature of the detection chamber 120.

[0168] Step 408: Control the sensor group 126 to work and obtain the refrigerant temperature value in the second chamber 122;

[0169] Step 410: Determine whether the refrigerant temperature in the second chamber 122 is equal to 40℃;

[0170] Step 412: If not, it is determined that the refrigerant has not reached the condition for detecting the saturation pressure value, and the sensor group 126 repeatedly acquires the refrigerant temperature value in the second chamber 122;

[0171] Step 414: If yes, determine that the refrigerant has reached the condition for detecting the saturation pressure value, and control the sensor group 126 to obtain the saturation pressure value of the refrigerant in the second chamber 122;

[0172] Step 416: Control the temperature control component 114 to stop working;

[0173] Step 418: Determine whether the initial deviation range between the saturation pressure value of the refrigerant in the second chamber 122 and the preset saturation pressure value is greater than 5%;

[0174] Step 420: If so, determine that the refrigerant does not meet the target refrigerant type requirement and / or does not meet the target refrigerant purity requirement, control the first valve 140 to block the first flow path 100, and stop the refrigerant detection and recovery;

[0175] Step 422: If not, determine that the refrigerant meets the type requirement of the target refrigerant and / or meets the purity requirement of the target refrigerant, control the first valve 140 to block the first flow path 100, control the second valve 240 to open the second flow path 200, and control the transmission unit 212 to transport the refrigerant to the container 220.

[0176] It can be further understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0177] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0178] It is further understood that although operations are described in a specific order in the accompanying drawings in the embodiments of this disclosure, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all of the shown operations to be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0179] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0180] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A refrigerant recovery system, characterized in that, include: Refrigerant outlet piping (400) for connection to the refrigeration equipment to be recycled; The first flow path (100) and the second flow path (200) are connected in parallel to the outlet end of the refrigerant outlet pipe (400); A first flow path (100) includes a detection component (110) and a first valve (140). The detection component (110) is located downstream of the first valve (140) and is used to detect the saturation pressure value of the refrigerant flowing into the first flow path (100). The second flow path (200) includes a recovery component (210) and a second valve (240). The recovery component (210) is located downstream of the second valve (240) and is used to recover the refrigerant flowing into the second flow path (200). The refrigerant recovery system is in detection mode, the first flow path (100) and the second flow path (200) are set such that the first valve (140) is open and the second valve (240) is closed, and the detection component (110) is able to detect the saturation pressure value of the refrigerant flowing into the first flow path (100); The refrigerant recovery system is in recovery mode, the first valve (140) is closed, the second valve (240) is open, and the recovery component (210) is able to recover the refrigerant flowing into the second flow path (200).

2. The refrigerant recovery system as described in claim 1, characterized in that, The detection component (110) includes: A temperature control chamber (112) is provided, wherein a first chamber is provided in the temperature control chamber (112), and a temperature control component (114) and a detection chamber (120) are provided in the first chamber; The temperature control component (114) is used to maintain a constant temperature value inside the temperature control chamber (112); The detection chamber (120) forms a second chamber (122), which is connected to the first flow path (100). The detection chamber (120) is equipped with a sensor group (126), which includes a temperature sensor (128) and a pressure sensor (130), which are used to detect the temperature and saturation pressure of the refrigerant in the detection chamber (120), respectively.

3. The refrigerant recovery system as described in claim 2, characterized in that, The testing chamber (120) includes: The controller (142) is equipped with a temperature sensor (128) and a pressure sensor (130) which are electrically connected to the controller (142). The controller (142) is configured to: when the temperature value detected by the temperature sensor (128) reaches the preset temperature value, control the pressure sensor (130) to detect the saturation pressure value of the refrigerant in the second chamber (122).

4. The refrigerant recovery system as described in claim 2, characterized in that, The temperature control component (114) is located on the side of the detection chamber (120) away from the first valve (140), and the temperature control component (114) includes a heating element (116) and a first fan (118).

5. The refrigerant recovery system as described in claim 2, characterized in that, The recycling component (210) includes: The refrigerant is transported to the refrigerant via a transfer section (212) and a receiving section (220), the receiving section (220) being located downstream of the transfer section (212).

6. The refrigerant recovery system as described in claim 5, characterized in that, The transmission unit (212) includes: A compressor (214) and a condenser (216), the condenser (216) being located downstream of the compressor (214); A second fan (218) is used to cool the condenser (216).

7. The refrigerant recovery system as described in claim 6, characterized in that, The accommodating portion (220) includes: A third valve (222) is located downstream of the condenser (216); Storage tank (224), the storage tank (224) being located downstream of the third valve (222); The third valve (222) is a one-way valve.

8. The refrigerant recovery system as described in claim 5, characterized in that, The refrigerant recovery system also includes: Purification component (300) is disposed in the refrigerant outlet pipe (400).

9. A control method, characterized in that, The control method is used to control the refrigerant recovery system as described in any one of claims 1-7, the control method comprising: Control the first valve (140) to open the first flow path (100), and control the second valve (240) to block the second flow path (200); The detection component (110) is controlled to acquire the saturation pressure value of the refrigerant; Determine whether the deviation range between the saturation pressure value of the refrigerant and the preset saturation pressure value is greater than the preset deviation range; If so, if it is determined that the refrigerant does not meet the type requirement of the target refrigerant and / or does not meet the purity requirement of the target refrigerant, the first valve (140) is controlled to block the first flow path (100) and the detection and recovery of the refrigerant is stopped; If not, determine that the refrigerant meets the type requirement and / or purity requirement of the target refrigerant, control the first valve (140) to block the first flow path (100), control the second valve (240) to open the second flow path (200), control the refrigerant to flow into the second flow path (200), and control the recovery component (210) to recover the refrigerant.

10. A control method, characterized in that, The control method is used to control the refrigerant recovery system as described in claim 8, the control method comprising: Control the refrigerant as it passes through the purification assembly (300); Control the first valve (140) to open the first flow path (100), and control the second valve (240) to block the second flow path (200); The temperature control component (114) is controlled to operate, thereby raising the temperature of the detection chamber (120); Control the sensor group (126) to work and obtain the refrigerant temperature value in the second chamber (122); Determine whether the refrigerant temperature value in the second chamber (122) is equal to the preset temperature value; If not, it is determined that the refrigerant has not reached the condition for detecting the saturation pressure value, and the sensor group (126) repeatedly acquires the refrigerant temperature value in the second chamber (122); If so, if it is determined that the refrigerant has reached the condition for detecting the saturation pressure value, the sensor group (126) is controlled to acquire the saturation pressure value of the refrigerant in the second chamber (122); The temperature control component (114) is controlled to stop working; Determine whether the initial deviation range between the saturation pressure value of the refrigerant in the second chamber (122) and the preset saturation pressure value is greater than the preset deviation range; If so, if it is determined that the refrigerant does not meet the type requirement of the target refrigerant and / or does not meet the purity requirement of the target refrigerant, the first valve (140) is controlled to block the first flow path (100) and the detection and recovery of refrigerant is stopped; If not, determine that the refrigerant meets the type requirement and / or purity requirement of the target refrigerant, control the first valve (140) to block the first flow path (100), control the second valve (240) to open the second flow path (200), and control the transmission unit (212) to transport the refrigerant to the receiving unit (220).

11. The control method according to claim 10, characterized in that, The preset temperature value is 40℃, and the preset deviation range is 5%.

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