Refrigerant recovery and charging device and control method thereof

Abstract

The present application provides a kind of refrigerant recovery filling device and its control method, wherein the refrigerant recovery filling device includes: shell;First pressure regulating mechanism, including the piston that can move in shell, and it is formed with the storage cavity for storing refrigerant between the one side of piston and shell, first pressure regulating mechanism is used to adjust the pressure in storage cavity by changing the volume of storage cavity;Second pressure regulating mechanism, including the heating part for heating storage cavity and the cooling part for cooling storage cavity, for adjusting the pressure in storage cavity by heating or cooling storage cavity;Ventilation mechanism, communication with storage cavity, for communicating the refrigeration cycle system of refrigeration equipment.The refrigerant recovery filling device and its control method of the present application make that the refrigerant recovery filling device can have as small as possible volume, facilitate maintenance personnel, the use of test or research and development personnel, while also guarantee the universality of refrigerant recovery filling device use.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and in particular to a refrigerant recovery and charging device and its control method. Background Technology

[0002] Many refrigeration devices are used in people's production and daily life, such as air conditioners and refrigerators. When the refrigerant in a refrigeration device is insufficient, it needs to be replenished to ensure the refrigeration effect. Alternatively, when a refrigeration device is phased out, the refrigerant can be recycled and reused. Furthermore, during the research and development of refrigeration equipment, it is necessary to frequently add refrigerant to the refrigeration cycle system and recover the refrigerant within the system to determine the appropriate amount of refrigerant that can be charged into the refrigeration cycle system to achieve the best cooling effect and energy efficiency.

[0003] Currently, conventional refrigerant recovery machines are bulky and inconvenient to carry. Furthermore, they require an external storage tank during refrigerant recovery and refilling, making them inconvenient for maintenance, testing, and R&D personnel. Another type is a refrigerant recovery and refilling device with a piston-driven cylinder or tank. This device uses the piston to change the pressure in the storage chamber within the cylinder or tank to recover and refill the refrigerant. However, the variable pressure range of the storage chamber is limited by the size of the cylinder or tank. With a smaller cylinder or tank, the pressure range is limited, making it only suitable for recovering small amounts of refrigerant, such as residual refrigerant in the recovery pipes of a refrigerant recovery device. Moreover, it is easily affected by temperature. At high temperatures, the piston movement cannot lower the pressure in the storage chamber to the pressure required for refrigerant recovery; at low temperatures, the piston movement cannot raise the pressure to the required level, limiting its applicability. Summary of the Invention

[0004] One object of the present invention is to provide a refrigerant recovery and refueling device and its control method that can solve at least one of the defects in the prior art.

[0005] A further objective of this invention is to make the refrigerant recovery and charging device as small as possible, so as to facilitate use by maintenance personnel, testers or researchers, while ensuring the wide applicability of the refrigerant recovery and charging device.

[0006] In particular, the present invention provides a refrigerant recovery and charging device, comprising:

[0007] case;

[0008] The first pressure regulating mechanism includes a piston movable within a housing, and a storage cavity for storing refrigerant is formed between one side of the piston and the housing. When the piston moves, the volume of the storage cavity changes. The first pressure regulating mechanism is used to regulate the pressure within the storage cavity by changing the volume of the storage cavity.

[0009] The second pressure regulating mechanism is disposed in the storage cavity and includes a heating part for heating the storage cavity and a cooling part for cooling the storage cavity, for regulating the pressure in the storage cavity by heating or cooling the storage cavity.

[0010] A venting mechanism, connected to the storage cavity, is used to connect the refrigeration cycle system of the refrigeration equipment.

[0011] Furthermore, the second pressure regulating mechanism includes:

[0012] A thermoelectric cooler is disposed on the side wall of a housing and has a first working end and a second working end that can provide heat or cold. The first working end is exposed to the storage cavity. When the direction of the current flowing through the thermoelectric cooler is a first direction, the first working end is a heating part. When the direction of the current flowing through the thermoelectric cooler is a second direction, the first working end is a cooling part, and the directions of the first and second directions are opposite.

[0013] Furthermore, the storage cavity is located below the piston, and the piston moves in the vertical direction, while the thermoelectric cooler is arranged in the vertical direction;

[0014] The ventilation system includes:

[0015] The first refrigerant passage, the first end of which is connected to the bottom of the storage cavity;

[0016] The pin switch is located at the second end of the first refrigerant passage and is used to connect to the inspection port of the three-way valve of the refrigeration cycle system.

[0017] Furthermore, the refrigerant recovery and refueling device also includes:

[0018] An oil separator is disposed below the storage cavity and connects the first end of the first refrigerant channel to the storage cavity; and,

[0019] The ventilation system also includes:

[0020] The second refrigerant passage has its first end connected to the bottom of the storage cavity and its second end connected to the first refrigerant passage.

[0021] The switching mechanism is located at the connection between the first refrigerant channel and the second refrigerant channel, and has a first state in which the refrigeration cycle system is connected to the oil separator when the pin switch is turned on, and a second state in which the refrigeration cycle system is connected to the second refrigerant channel.

[0022] Furthermore, the refrigerant recovery and refueling device also includes:

[0023] The filter is installed on the first refrigerant passage and is located between the switching mechanism and the oil separator;

[0024] The flow meter is installed on the first refrigerant channel and is located between the switching mechanism and the pin switch.

[0025] Furthermore, the refrigerant recovery and refueling device also includes:

[0026] A partition is positioned between the top of the housing and the piston; and,

[0027] The first pressure regulating mechanism also includes:

[0028] The piston rod passes through the partition plate, with one end connected to the piston and the other end equipped with a magnetic attraction mechanism;

[0029] An electromagnetic coil is mounted on the housing and positioned opposite the magnetic attraction mechanism.

[0030] A traction spring is positioned between the magnetic attraction mechanism and the electromagnetic coil.

[0031] In particular, the present invention also provides a control method for a refrigerant recovery and charging device, wherein the refrigerant recovery and charging device includes:

[0032] case;

[0033] The first pressure regulating mechanism includes a piston movable within a housing, and a storage cavity for storing refrigerant is formed between one side of the piston and the housing. When the piston moves, the volume of the storage cavity changes. The first pressure regulating mechanism is used to regulate the pressure within the storage cavity by changing the volume of the storage cavity.

[0034] The second pressure regulating mechanism is disposed in the storage cavity and includes a heating part for heating the storage cavity and a cooling part for cooling the storage cavity, for regulating the pressure in the storage cavity by heating or cooling the storage cavity.

[0035] A venting mechanism, connected to the storage cavity, is used to connect to the refrigeration cycle system of the refrigeration equipment; and...

[0036] Control methods include:

[0037] The first pressure regulating mechanism is used to adjust the volume of the storage cavity to a preset value;

[0038] Real-time acquisition of system pressure within the refrigeration cycle system;

[0039] Real-time acquisition of cavity pressure within the storage cavity;

[0040] Determine whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and charging;

[0041] If not, control the second pressure regulating mechanism to adjust the pressure inside the storage cavity.

[0042] Furthermore, the second pressure regulating mechanism includes:

[0043] A thermoelectric cooler, disposed on the side wall of a housing, has a first working end and a second working end that can provide heat or cold. The first working end is exposed in the storage cavity. When the direction of current flowing through the thermoelectric cooler is a first direction, the first working end functions as a heating element; when the direction of current flowing through the thermoelectric cooler is a second direction, the first working end functions as a cooling element, and the directions of the first and second current flows are opposite.

[0044] The steps for controlling the second pressure regulating mechanism to regulate the pressure inside the storage cavity include:

[0045] A current with a preset direction is passed through the thermoelectric cooler, and the current flowing through the thermoelectric cooler is adjusted to a first preset current value;

[0046] A secondary judgment is made to determine whether the system pressure and cavity pressure meet the preset conditions;

[0047] If not, adjust the current flowing through the thermoelectric cooler to a second preset current value, wherein the second preset current value is greater than the first preset current value;

[0048] The system pressure and cavity pressure are checked three times to see if they meet the preset conditions.

[0049] If the system pressure and cavity pressure fail to meet the preset conditions in three separate determinations, obtain the adjustment time taken for the step of adjusting the current flowing through the semiconductor cooling chip to the second preset value.

[0050] Determine if the adjustment duration is less than the preset duration;

[0051] If the adjustment time is less than the preset time, return to the step of judging whether the system pressure and cavity pressure meet the preset conditions three times;

[0052] When the system pressure and cavity pressure meet preset conditions, the steps of controlling the second pressure regulating mechanism to regulate the pressure inside the storage cavity also include:

[0053] The refrigeration cycle system and the storage cavity are connected by a ventilation mechanism.

[0054] Furthermore, the ventilation mechanism includes:

[0055] The first refrigerant passage, the first end of which is connected to the bottom of the storage cavity;

[0056] The pin switch is located at the second end of the first refrigerant passage and is used to connect to the inspection port of the three-way valve of the refrigeration cycle system.

[0057] The refrigerant recovery and refueling device includes:

[0058] An oil separator is located below the storage cavity and connects the first end of the first refrigerant channel to the storage cavity;

[0059] The ventilation system also includes:

[0060] The second refrigerant passage has its first end connected to the bottom of the storage cavity and its second end connected to the first refrigerant passage.

[0061] The switching mechanism is located at the connection between the first refrigerant channel and the second refrigerant channel, and has a first state in which the refrigeration cycle system is connected to the oil separator when the pin switch is turned on, and a second state in which the refrigeration cycle system is connected to the second refrigerant channel.

[0062] In situations where it is necessary to recover the refrigerant from the refrigeration cycle system:

[0063] The steps of controlling the first pressure regulating mechanism to adjust the volume of the storage cavity to a preset value include:

[0064] The first pressure regulating mechanism expands the volume of the storage cavity to a preset value; and,

[0065] The steps to determine whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and charging include:

[0066] Determine if the cavity pressure is less than the system pressure;

[0067] If so, determine whether the difference between the cavity pressure and the system pressure is greater than a first predetermined value;

[0068] If the difference is greater than or equal to the first predetermined value, it is determined that the system pressure and cavity pressure meet the preset conditions.

[0069] If the difference is less than a first predetermined value, or if the cavity pressure is greater than or equal to the system pressure, it is determined that the system pressure and cavity pressure do not meet the preset conditions; and,

[0070] The preset flow direction is the first flow direction; and,

[0071] The steps of connecting the refrigeration cycle system and the storage cavity via a ventilation mechanism include:

[0072] Turn on the ejector pin switch and adjust the switching mechanism to the first state.

[0073] Furthermore, the ventilation mechanism includes:

[0074] The first refrigerant passage, the first end of which is connected to the bottom of the storage cavity;

[0075] The pin switch is located at the second end of the first refrigerant passage and is used to connect to the inspection port of the three-way valve of the refrigeration cycle system.

[0076] The refrigerant recovery and refueling device includes:

[0077] An oil separator is located below the storage cavity and connects the first end of the first refrigerant channel to the storage cavity;

[0078] The ventilation system also includes:

[0079] The second refrigerant passage has its first end connected to the bottom of the storage cavity and its second end connected to the first refrigerant passage.

[0080] The switching mechanism is located at the connection between the first refrigerant channel and the second refrigerant channel, and has a first state in which the refrigeration cycle system is connected to the oil separator when the pin switch is turned on, and a second state in which the refrigeration cycle system is connected to the second refrigerant channel.

[0081] When it is necessary to add refrigerant to the refrigeration cycle system:

[0082] The steps of controlling the first pressure regulating mechanism to adjust the volume of the storage cavity to a preset value include:

[0083] The volume of the compression storage cavity is controlled to a preset value by the first pressure regulating mechanism; and,

[0084] The steps to determine whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and charging include:

[0085] Determine if the cavity pressure is greater than the system pressure;

[0086] If so, determine whether the difference between the cavity pressure and the system pressure is greater than a second predetermined value;

[0087] If the difference is greater than the second predetermined value, it is determined that the system pressure and cavity pressure meet the preset conditions.

[0088] If the difference is less than or equal to the second predetermined value, or if the cavity pressure is less than or equal to the system pressure, it is determined that the system pressure and cavity pressure do not meet the preset conditions; and,

[0089] The preset flow direction is the second flow direction; and,

[0090] The steps of connecting the refrigeration cycle system and the storage cavity via a ventilation mechanism include:

[0091] Turn on the ejector pin switch and adjust the switching mechanism to the second state.

[0092] The refrigerant recovery and charging device of the present invention, since the storage cavity for storing refrigerant is located on the main body of the device, does not require an external storage tank during the refrigerant recovery and charging process. Furthermore, the device incorporates both a first pressure regulating mechanism (which adjusts the pressure within the storage cavity by adjusting a piston) and a second pressure regulating mechanism (which adjusts the pressure within the storage cavity by adjusting the temperature). If the piston movement cannot adjust the pressure of the storage cavity to the required level for refrigerant recovery or charging, the second pressure regulating mechanism can further adjust the pressure to complete the refrigerant recovery and charging process. This expands the variable pressure range of the storage cavity beyond the limitations of the device's size, ensuring the amount of refrigerant that can be recovered or charged. Consequently, the device can meet the refrigerant recovery and charging requirements of refrigeration equipment while minimizing its size; simultaneously, it avoids the influence of ambient temperature on the refrigerant recovery and charging process. Therefore, the refrigerant recovery and charging device of the present invention can have a small size, making it easy for maintenance personnel, testers, or R&D personnel to use, while also ensuring the wide applicability of the refrigerant recovery and charging device.

[0093] The control method of the refrigerant recovery and charging device of the present invention can be applied to the refrigerant recovery and charging device of the present invention. Therefore, the beneficial technical effects that the refrigerant recovery and charging device of the present invention can achieve can also be achieved by the control method of the refrigerant recovery and charging device of the present invention.

[0094] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0095] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0096] Figure 1 This is a schematic diagram of a refrigerant recovery and refueling device according to an embodiment of the present invention;

[0097] Figure 2 This is a schematic block diagram of the connection of a refrigerant recovery and charging device according to an embodiment of the present invention;

[0098] Figure 3This is a schematic flowchart of a control method for a refrigerant recovery and charging device according to an embodiment of the present invention;

[0099] Figure 4 This is a schematic flowchart of a control method for a refrigerant recovery and charging device according to another embodiment of the present invention;

[0100] Figure 5 This is a schematic flowchart of a control method for a refrigerant recovery and charging device according to yet another embodiment of the present invention;

[0101] Figure 6 This is a flowchart illustrating the process of determining whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and refueling in the control method of the refrigerant recovery and refueling device according to another embodiment of the present invention.

[0102] Figure 7 This is a schematic flowchart of a control method for a refrigerant recovery and charging device according to another embodiment of the present invention;

[0103] Figure 8 This is a flowchart illustrating the process of determining whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and refueling in the control method of the refrigerant recovery and refueling device according to another embodiment of the present invention. Detailed Implementation

[0104] In the description of this embodiment, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present 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 limitations on the present invention.

[0105] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically stated, this indicates that other features are not excluded and may be further included.

[0106] Unless otherwise expressly specified and limited, the terms "set up," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0107] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0108] Unless otherwise specified, all terms (including technical and scientific terms) used in the description of these embodiments have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0109] In the description of this embodiment, the reference to terms such as "embodiment," "modified embodiment," etc., indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0110] The following is combined with Figure 1 and Figure 2 The refrigerant recovery and refueling device of this embodiment will be described in detail below. Figure 1 This is a schematic diagram of a refrigerant recovery and refueling device according to an embodiment of the present invention; Figure 2 This is a schematic block diagram of the connection of a refrigerant recovery and charging device according to an embodiment of the present invention.

[0111] Reference Figure 1In this embodiment, the refrigerant recovery and charging device 100 includes a housing 110, a first pressure regulating mechanism 120, a second pressure regulating mechanism 130, and a venting mechanism 140. The first pressure regulating mechanism 120 includes a piston 121 movable within the housing 110, and a storage cavity 111 for storing refrigerant is formed between one side of the piston 121 and the housing 110. When the piston 121 moves, the volume of the storage cavity 111 changes. The first pressure regulating mechanism 120 is used to change the volume of the storage cavity 111 by adjusting the volume of the storage cavity 111. The volume adjustment storage cavity 111 has a pressure regulating mechanism; a second pressure regulating mechanism 130 is disposed in the storage cavity 111, the second pressure regulating mechanism 130 includes a heating part 131 for heating the storage cavity 111 and a cooling part 132 for cooling the storage cavity 111, the second pressure regulating mechanism 130 is used to regulate the pressure in the storage cavity 111 by heating or cooling the storage cavity 111; a venting mechanism 140 is connected to the storage cavity 111, the venting mechanism 140 is used to connect to the refrigeration cycle system of the refrigeration equipment.

[0112] Since the refrigerant recovery and charging device 100 of this embodiment has its refrigerant storage cavity 111 located on the main body of the device, no external storage tank is required during the refrigerant recovery and charging process. Furthermore, the refrigerant recovery and charging device 100 of this embodiment, while having a first pressure regulating mechanism 120 that regulates the pressure inside the storage cavity 111 by adjusting the piston 121, also has a second pressure regulating mechanism 130 that regulates the pressure inside the storage cavity 111 by adjusting the temperature inside the storage cavity 111. Therefore, if the movement of the piston 121 cannot adjust the pressure in the storage cavity 111 to the required level for refrigerant recovery... When refrigerant recovery or refilling is required, the pressure in the storage cavity 111 can be further adjusted by regulating the second pressure regulating mechanism 130 to complete the refrigerant recovery and refilling process. This allows the variable pressure range of the storage cavity 111 to exceed the size limitations of the refrigerant recovery and refilling device 100, ensuring the amount of refrigerant that can be recovered or refilled by the device. Correspondingly, the refrigerant recovery and refilling device 100 can meet the refrigerant recovery and refilling requirements of refrigeration equipment while minimizing its size; simultaneously, it avoids the influence of ambient temperature on the refrigerant recovery and refilling process. Therefore, the refrigerant recovery and refilling device 100 of this embodiment can have a small size, facilitating use by maintenance personnel, testing or R&D personnel, while also ensuring its wide applicability.

[0113] In this embodiment, the housing 110 can be made of steel to ensure the safety of the refrigerant recovery and charging device 100.

[0114] In this embodiment, the maximum amount of refrigerant that the refrigerant recovery and charging device 100 can recover can be set to 2kg, so that the refrigerant recovery and charging device 100 is suitable for the maintenance and testing of household air conditioners or refrigerators, while ensuring its convenience; at the same time, at 25°C, the pressure of 2kg of refrigerant stored in the storage cavity 111 is much less than the maximum safe pressure value, so as to ensure the safety of the refrigerant recovery and charging device 100 in use.

[0115] Reference Figure 1 In this embodiment, the second pressure regulating mechanism 130 includes a thermoelectric cooler 133. The thermoelectric cooler 133 is disposed on the side wall of the housing 110. The thermoelectric cooler 133 has a first working end and a second working end that can provide heat or cold. The first working end is exposed to the storage cavity 111. When the current flowing through the thermoelectric cooler 133 flows in a first direction, the first working end is a heating part 131; when the current flowing through the thermoelectric cooler 133 flows in a second direction, the first working end is a cooling part 132, and the first and second directions are opposite. This allows the second pressure regulating mechanism 130 to complete the process of heating and cooling the storage cavity 111.

[0116] In addition, the second working end can be attached to or embedded in the side wall of the housing 110, or it can pass through the housing 110 and be exposed to the outside of the housing 110, so as to avoid the heat or cold generated by the second working end from acting on the storage cavity 111.

[0117] In a modified embodiment, the second pressure regulating mechanism 130 includes a heater and an evaporator exposed within the storage cavity 111, the heater being a heating section 131 and the evaporator a cooling section 132. This allows the second pressure regulating mechanism 130 to perform the processes of heating and cooling the storage cavity 111. Furthermore, the energy efficiency or the increased heat or cooling capacity of the heater and cooling section 132 can be adjusted by regulating the current flowing through the heater and the amount of refrigerant flowing through the evaporator.

[0118] Reference Figure 1 In this embodiment, the storage cavity 111 is located below the piston 121, and the piston 121 moves in the vertical direction, while the semiconductor cooling chip 133 is arranged in the vertical direction.

[0119] Currently, existing technologies also include refrigerant recovery and recharging systems that include a container for storing refrigerant and at least two switching valves. Before recovering or recharging refrigerant, the two switching valves of the refrigerant recovery and recharging system need to be connected to the valve bodies on the high-pressure and low-pressure sides of the refrigeration cycle system, respectively, which is cumbersome. Especially when the refrigeration equipment is an air conditioner, it is necessary to disassemble the unit to complete the valve body connection operation before recovery or recharging.

[0120] Reference Figure 1 In this embodiment, the ventilation mechanism 140 includes a first refrigerant channel 141 and a pin switch 142. The first end of the first refrigerant channel 141 is connected to the bottom of the storage cavity 111; the pin switch 142 is disposed at the second end of the first refrigerant channel 141 and is used to connect to the inspection port of the three-way valve of the refrigeration cycle system.

[0121] It should be noted that when the refrigeration equipment requiring refrigerant recovery or recharging is an air conditioner, the pin switch 142 can be connected to the inspection port of the three-way valve on the outside of the air conditioner's outdoor unit, facilitating operation by maintenance personnel, testing personnel, or R&D personnel. Furthermore, in this embodiment, before recovering or recharging refrigerant, the refrigerant recovery and recharging device 100 only requires connecting the pin switch 142 to the inspection port of the refrigeration cycle system; no other pipes or valves need to be connected, further facilitating use by maintenance personnel, testing personnel, or R&D personnel, and simplifying operation.

[0122] Furthermore, during the refrigerant recovery and charging process, the refrigerant only needs to flow through the first refrigerant passage 141 and the ejector switch 142 to complete the process. The first refrigerant passage 141 can be formed within the housing 110 or through a separately installed pipeline.

[0123] Reference Figure 1 In this embodiment, the refrigerant recovery and refueling device 100 further includes an oil separator 150. The oil separator 150 is disposed below the storage cavity 111 and connects the first end of the first refrigerant channel 141 and the storage cavity 111. Therefore, during the refrigerant recovery process, the refrigerant passes through the oil separator 150 before entering the storage cavity 111, ensuring the purity of the recovered refrigerant.

[0124] Reference Figure 1 In this embodiment, the ventilation mechanism 140 further includes a second refrigerant channel 143 and a switching mechanism 144. The first end of the second refrigerant channel 143 is connected to the bottom of the storage cavity 111, and the second end of the second refrigerant channel 143 is connected to the first refrigerant channel 141. The switching mechanism 144 is disposed at the connection between the first refrigerant channel 141 and the second refrigerant channel 143. The switching mechanism 144 has a first state in which the refrigeration cycle system is connected to the oil separator 150 when the pin switch 142 is turned on, and a second state in which the refrigeration cycle system is connected to the second refrigerant channel 143.

[0125] Understandably, during the refrigerant recovery process, the pin switch 142 is opened, and the switching mechanism 144 is in the first state. Consequently, the refrigerant in the refrigeration cycle system is recovered into the storage cavity 111 through the pin switch 142, the first refrigerant channel 141, and the oil separator 150. During the refrigerant charging process into the refrigeration cycle system of the refrigeration equipment, the pin switch 142 is opened, and the switching mechanism 144 is in the second state. Consequently, the refrigerant in the storage cavity 111 enters the refrigeration cycle system through the second refrigerant channel 143, a portion of the first refrigerant channel 141, and the pin switch 142. This ensures the purity of the refrigerant during recovery and charging.

[0126] Furthermore, the second refrigerant passage 143 can be formed within the housing 110 or through a separately installed pipeline. The switching mechanism 144 can be a three-way valve; it can also be a three-way fitting and two valves. Specifically, the three-way fitting is connected at the connection between the first refrigerant passage 141 and the second refrigerant passage 143, one valve is connected between the three-way fitting and the first refrigerant passage 141, and the other valve is connected between the three-way fitting and the second refrigerant passage 143.

[0127] Reference Figure 1 In this embodiment, the refrigerant recovery and charging device 100 further includes a filter 160. The filter 160 is disposed on the first refrigerant channel 141 and is located between the switching mechanism 144 and the oil separator 150 to filter out impurities that may be contained in the recovered refrigerant, thereby further ensuring the purity of the recovered and charged refrigerant.

[0128] Reference Figure 1 In this embodiment, the refrigerant recovery and charging device 100 further includes a flow meter 170, which is disposed on the first refrigerant channel 141 and located between the switching mechanism 144 and the pin switch 142. Maintenance personnel can then use the flow meter 170 to determine the amount of refrigerant being added to or recovered from the refrigeration cycle system, thus completing the charging or recovery operation. Compared to the sight glass on the pipeline of existing refrigerant recovery machines, the refrigerant recovery and charging device 100 of this embodiment provides more accurate refrigerant recovery or charging. This facilitates the control of refrigerant quantity by R&D or testing personnel during testing and debugging.

[0129] Reference Figure 1In this embodiment, the refrigerant recovery and charging device 100 further includes a partition 180, which is disposed between the top of the housing 110 and the piston 121. The first pressure regulating mechanism 120 further includes a piston rod 122, an electromagnetic coil 123, and a traction spring 124. The piston rod 122 passes through the partition 180, with one end connected to the piston 121 and the other end provided with a magnetic attraction mechanism. The electromagnetic coil 123 is disposed on the housing 110, and is disposed opposite to the magnetic attraction mechanism. The traction spring 124 is disposed between the magnetic attraction mechanism and the electromagnetic coil 123. Thus, when the electromagnetic coil 123 is energized or de-energized, the piston 121 can be driven to move.

[0130] In addition, the partition 180 can be a pressure-resistant partition 180; the piston rod 122, the electromagnetic coil 123 and the traction spring 124 can all be arranged in the space formed between the partition 180 and the top of the housing 110.

[0131] In a modified embodiment, the refrigerant recovery and charging device 100 further includes a partition 180, which is disposed between the top of the housing 110 and the piston 121. The first pressure regulating mechanism 120 further includes a piston rod 122 and a drive motor, and a rack is provided on the piston rod 122. A gear that meshes with the rack is provided on the output shaft of the drive motor. The piston rod 122 passes through the partition 180, and one end of the piston rod 122 is connected to the piston 121. Thus, the piston 121 can be moved by rotating the drive motor in both directions.

[0132] Reference Figure 1 In this embodiment, the refrigerant recovery and charging device 100 may further include a first pressure sensor 191 and a second pressure sensor 192; the first pressure sensor 191 may be disposed in the storage cavity 111 to obtain the cavity pressure in the storage cavity 111; the second pressure sensor 192 may be disposed in the pin switch 142 on the side connected to the refrigeration cycle system to obtain the system pressure in the refrigeration cycle system.

[0133] Reference Figure 1 and Figure 2 In this embodiment, the refrigerant recovery and charging device 100 may further include a controller 200, which includes a memory 210 and a processor 220. The memory 210 stores a machine-executable program 211, which, when executed by the processor 220, implements the control method of the refrigerant recovery and charging device 100 described in the following embodiments. Furthermore, the refrigerant recovery and charging device 100 of this embodiment can also achieve the beneficial technical effects that the control method of the following embodiments can achieve. Moreover, the refrigerant recovery and charging device 100 of this embodiment can achieve beneficial technical effects, and the control method of the following embodiments is also present.

[0134] In addition, the first pressure sensor 191, the second pressure sensor 192, the pin switch 142, the switching mechanism 144, the electromagnetic coil 123, and the semiconductor cooling chip 133 can also be electrically connected to the controller 200.

[0135] The following is combined with Figures 3 to 8 The control method of the refrigerant recovery and charging device in this embodiment will be described in detail below.

[0136] Figure 3 This is a schematic flowchart of a control method for a refrigerant recovery and charging device according to an embodiment of the present invention; see reference. Figure 3 In this embodiment, the control method for the refrigerant recovery and charging device 100 includes:

[0137] Step S302: Control the first pressure regulating mechanism 120 to adjust the volume of the storage cavity 111 to a preset value.

[0138] Step S304: Obtain the system pressure within the refrigeration cycle system in real time.

[0139] Step S306: Obtain the cavity pressure in the storage cavity 111 in real time.

[0140] Step S308: Determine whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and charging; if not, proceed to step S310; if yes, proceed to step S422 in the following embodiment.

[0141] Step S310: Control the second pressure regulating mechanism 130 to regulate the pressure inside the storage cavity 111.

[0142] It is understood that the control method of the refrigerant recovery and charging device 100 in this embodiment, when the pressure of the storage cavity 111 cannot be adjusted to the required level for refrigerant recovery or charging by moving the piston 121, can further adjust the pressure of the storage cavity 111 by adjusting the second pressure regulating mechanism 130 to complete the refrigerant recovery and charging process. This allows the variable range of the pressure in the storage cavity 111 to exceed the size limitation of the refrigerant recovery and charging device 100, thus ensuring the amount of refrigerant that can be recovered or charged by the refrigerant recovery and charging device 100; and avoids the influence of ambient temperature on the refrigerant recovery and charging process of the refrigerant recovery and charging device 100. Therefore, the control method of the refrigerant recovery and charging device 100 in this embodiment allows the refrigerant recovery and charging device 100 to have a small size, making it easy for maintenance personnel, testing or R&D personnel to use, while also ensuring the wide applicability of the refrigerant recovery and charging device 100.

[0143] Reference Figure 3In this embodiment, step S310, controlling the second pressure regulating mechanism 130 to regulate the pressure in the storage cavity 111, may include steps S410 to S422.

[0144] Figure 4 This is a schematic flowchart of a control method for a refrigerant recovery and charging device according to another embodiment of the present invention; see reference. Figure 4 In this embodiment, the control method for the refrigerant recovery and charging device 100 includes:

[0145] Step S402: Control the first pressure regulating mechanism 120 to adjust the volume of the storage cavity 111 to a preset value.

[0146] Step S404: Obtain the system pressure within the refrigeration cycle system in real time.

[0147] Step S406: Obtain the cavity pressure in the storage cavity 111 in real time.

[0148] Step S408: Determine whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and charging; if not, proceed to step S410; if yes, proceed to step S422 in the following embodiment.

[0149] In step S410, a current with a preset direction is passed through the thermoelectric cooler 133, and the current flowing through the thermoelectric cooler 133 is adjusted to a first preset current value.

[0150] Step S412: Secondarily determine whether the system pressure and cavity pressure meet the preset conditions; if not, proceed to step S414; if yes, proceed to step S422 in the following embodiment.

[0151] Step S414: Adjust the current flowing through the semiconductor cooling chip 133 to a second preset current value, wherein the second preset current value is greater than the first preset current value.

[0152] Step S416: Determine three times whether the system pressure and cavity pressure meet the preset conditions. If not, that is, if the system pressure and cavity pressure do not meet the preset conditions in the three determinations, proceed to step S418; if yes, proceed to step S422 in the following embodiment.

[0153] Step S418: Obtain the adjustment time elapsed during the step of adjusting the current flowing through the semiconductor cooling chip 133 to a second preset value.

[0154] Step S420: Determine whether the adjustment time is less than the preset time. If yes, return to step S416, that is, if the adjustment time is less than the preset time, return to the step of determining whether the system pressure and cavity pressure meet the preset conditions three times. If no, a prompt message can be issued that the condensation in the storage cavity 111 is full.

[0155] Understandably, by increasing the current value of the thermoelectric cooler 133 in stages through steps S410 to S416, the thermoelectric cooler 133 can consume as little electrical energy as possible, ensuring the low energy consumption of the refrigerant recovery and charging device 100. Through steps S418 to S420, the user (maintenance personnel, testing or R&D personnel) of the refrigerant recovery and charging device 100 can be reminded, further facilitating its use by maintenance personnel, testing or R&D personnel.

[0156] It should be noted that the "second" and "third" in steps S412 and S416 may simply mean that step S408 has been executed again. The first preset current value in step S410 may be the current value of the thermoelectric cooler 133 when achieving optimal cooling or heating efficiency; the second preset current value in step S414 may be the current value of the thermoelectric cooler 133 when achieving maximum cooling or heating capacity.

[0157] Reference Figure 4 In this embodiment, when the system pressure and cavity pressure meet preset conditions, the control method of the refrigerant recovery and charging device 100 includes:

[0158] In step S422, the refrigeration cycle system and the storage cavity 111 are connected through the ventilation mechanism 140. This allows refrigerant in the refrigeration cycle system to flow into the storage cavity 111, or refrigerant in the storage cavity 111 to flow into the refrigeration cycle system, completing the refrigerant recovery or charging operation.

[0159] Figure 5 This is a schematic flowchart of a control method for a refrigerant recovery and charging device according to yet another embodiment of the present invention; Figure 6 This is a flowchart illustrating the process of determining whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and charging in the control method of a refrigerant recovery and charging device according to another embodiment of the present invention; see reference. Figure 5 In this embodiment, when it is necessary to recover refrigerant from the refrigeration cycle system, the control method of the refrigerant recovery and charging device 100 includes:

[0160] Step S502: Control the first pressure regulating mechanism 120 to expand the volume of the storage cavity 111 to a preset value.

[0161] Step S504: Obtain the system pressure within the refrigeration cycle system in real time.

[0162] Step S506: Obtain the cavity pressure in the storage cavity 111 in real time.

[0163] Step S508: Determine whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and charging; if not, proceed to step S510; if yes, proceed to step S522 in the following embodiment.

[0164] In step S510, a first-direction current is supplied to the thermoelectric cooler 133, and the current flowing through the thermoelectric cooler 133 is adjusted to a first preset current value. This allows the second pressure regulating mechanism 130 to reduce the pressure in the storage cavity 111 by cooling the storage cavity 111 through the thermoelectric cooler 133.

[0165] Step S512: Secondarily determine whether the system pressure and cavity pressure meet the preset conditions; if not, proceed to step S514; if yes, proceed to step S522 in the following embodiment.

[0166] In step S514, the current flowing through the thermoelectric cooler 133 is adjusted to a second preset current value, wherein the second preset current value is greater than the first preset current value, in order to further reduce the pressure in the storage cavity 111.

[0167] Step S516: Determine three times whether the system pressure and cavity pressure meet the preset conditions. If not, that is, if the system pressure and cavity pressure do not meet the preset conditions in the three determinations, proceed to step S518; if yes, proceed to step S522 in the following embodiment.

[0168] Step S518: Obtain the adjustment time elapsed during the step of adjusting the current flowing through the semiconductor cooling chip 133 to a second preset value.

[0169] Step S520: Determine whether the adjustment time is less than the preset time. If yes, return to step S516, that is, if the adjustment time is less than the preset time, return to the step of determining whether the system pressure and cavity pressure meet the preset conditions three times. If no, a prompt message can be issued that the condensation in the storage cavity 111 is full.

[0170] It should be understood that when it is necessary to recover the refrigerant in the refrigeration cycle system, step S502 can be used to raise the piston 121, increase the volume of the storage cavity 111, and thereby reduce the pressure in the storage cavity 111. Furthermore, the preset value in step S502 can be the maximum volume value, that is, the volume value of the storage cavity 111 when the piston 121 rises to the highest position or touches the partition 180.

[0171] In addition, steps S508, S512 and S516 may include steps S602 to S608 in the following embodiments.

[0172] Reference Figure 5In this embodiment, when the system pressure and cavity pressure meet preset conditions, the control method further includes:

[0173] In step S522, turn on the pin switch 142 and adjust the switching mechanism 144 to the first state. Then, the refrigerant in the refrigeration cycle system can enter the storage cavity 111 through the pin switch 142, the first refrigerant channel 141 (and the oil separator 150) to complete the refrigerant recovery.

[0174] Reference Figure 6 In this embodiment, the step of determining whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and recharge includes:

[0175] Step S602: Determine whether the cavity pressure is less than the system pressure; if yes, proceed to step S604; if no, that is, if the cavity pressure is greater than or equal to the system pressure, proceed to step S608.

[0176] Step S604: Determine whether the difference between the cavity pressure and the system pressure is greater than a first predetermined value; if the difference is greater than or equal to the first predetermined value, proceed to step S606; if the difference is less than the first predetermined value, proceed to step S608.

[0177] Step S606: Determine that the system pressure and cavity pressure meet the preset conditions.

[0178] Step S608: Determine that the system pressure and cavity pressure do not meet the preset conditions.

[0179] It is understood that the first predetermined value can be in the range of 4.5 Pa to 5.5 Pa, preferably 5 Pa. Under this pressure difference, the flow rate of the refrigerant from the refrigeration cycle system to the storage cavity 111 can be appropriate, and the safety of the refrigerant recovery process can be guaranteed.

[0180] Alternatively, the preset condition could be that the cavity pressure is less than the system pressure minus a first predetermined value.

[0181] Figure 7 This is a schematic flowchart of a control method for a refrigerant recovery and charging device according to another embodiment of the present invention; Figure 8 This is a flowchart illustrating the process of determining whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and charging in the control method of the refrigerant recovery and charging device according to another embodiment of the present invention; see reference. Figure 7 In this embodiment, when it is necessary to add refrigerant to the refrigeration cycle system, the control method of the refrigerant recovery and charging device 100 includes:

[0182] Step S702: Control the first pressure regulating mechanism 120 to compress the volume of the storage cavity 111 to a preset value.

[0183] Step S704: Obtain the system pressure within the refrigeration cycle system in real time.

[0184] Step S706: Obtain the cavity pressure in the storage cavity 111 in real time.

[0185] Step S708: Determine whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and charging; if not, proceed to step S710; if yes, proceed to step S722 in the following embodiment.

[0186] In step S710, a second current is supplied to the thermoelectric cooler 133, and the current flowing through the thermoelectric cooler 133 is adjusted to a first preset current value. This causes the second pressure regulating mechanism 130 to increase the pressure in the storage cavity 111 by heating the storage cavity 111 through the thermoelectric cooler 133.

[0187] Step S712: Secondarily determine whether the system pressure and cavity pressure meet the preset conditions; if not, proceed to step S714; if yes, proceed to step S722 in the following embodiment.

[0188] In step S714, the current flowing through the thermoelectric cooler 133 is adjusted to a second preset current value, wherein the second preset current value is greater than the first preset current value, in order to further increase the pressure in the storage cavity 111.

[0189] Step S716: Determine three times whether the system pressure and cavity pressure meet the preset conditions. If not, that is, if the system pressure and cavity pressure do not meet the preset conditions in the three determinations, proceed to step S718; if yes, proceed to step S722 in the following embodiment.

[0190] Step S718: Obtain the adjustment time elapsed during the step of adjusting the current flowing through the semiconductor cooling chip 133 to a second preset value.

[0191] Step S720: Determine whether the adjustment time is less than the preset time. If yes, return to step S716, that is, if the adjustment time is less than the preset time, return to the step of determining whether the system pressure and cavity pressure meet the preset conditions three times. If no, a prompt message can be issued that the condensation in the storage cavity 111 is full.

[0192] It should be understood that when it is necessary to recover the refrigerant in the refrigeration cycle system, the piston 121 can be lowered in step S702 to reduce the volume of the storage cavity 111, thereby increasing the pressure in the storage cavity 111. Furthermore, the preset value in step S702 is less than the maximum safe pressure value that the storage cavity 111 can withstand.

[0193] In addition, steps S708, S712 and S716 may include steps S802 to S808 in the following embodiments.

[0194] Reference Figure 7 In this embodiment, when the system pressure and cavity pressure meet preset conditions, the control method further includes:

[0195] In step S722, the ejector switch 142 is turned on, and the switching mechanism 144 is adjusted to the second state. The refrigerant in the storage cavity 111 can then enter the refrigeration cycle system through the second refrigerant channel 143 and the ejector switch 142 (or it can enter the refrigeration cycle system through the first refrigerant channel 141 and the ejector switch 142), completing the refrigerant charging process.

[0196] Reference Figure 8 In this embodiment, the step of determining whether the system pressure and cavity pressure meet the preset conditions for refrigerant recovery and recharge includes:

[0197] Step S802: Determine whether the cavity pressure is greater than the system pressure; if yes, proceed to step S804; if no, that is, if the cavity pressure is less than or equal to the system pressure, proceed to step S808.

[0198] Step S804: Determine whether the difference between the cavity pressure and the system pressure is greater than a second predetermined value; if the difference is greater than the second predetermined value, proceed to step S806; if the difference is less than or equal to the second predetermined value, proceed to step S808.

[0199] Step S806: Determine that the system pressure and cavity pressure meet the preset conditions.

[0200] Step S808: Determine that the system pressure and cavity pressure do not meet the preset conditions.

[0201] It is understandable that the second predetermined value can be the same as the first predetermined value.

[0202] Alternatively, the preset condition could be that the cavity pressure is greater than the system pressure plus a second predetermined value.

[0203] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A control method for a refrigerant recovery and charging device, wherein the refrigerant recovery and charging device comprises: case; A first pressure regulating mechanism includes a piston movable within the housing, and a storage cavity for storing refrigerant is formed between one side of the piston and the housing. When the piston moves, the volume of the storage cavity changes. The first pressure regulating mechanism is used to regulate the pressure within the storage cavity by changing the volume of the storage cavity. A second pressure regulating mechanism is disposed within the storage cavity, including a heating part for heating the storage cavity and a cooling part for cooling the storage cavity, for regulating the pressure within the storage cavity by heating or cooling the storage cavity; A ventilation mechanism, connected to the storage cavity, is used to connect to the refrigeration cycle system of the refrigeration equipment; and, The control method includes: The first pressure regulating mechanism is controlled to adjust the volume of the storage cavity to a preset value; Real-time acquisition of system pressure within the refrigeration cycle system; Real-time acquisition of cavity pressure within the storage cavity; Determine whether the system pressure and the cavity pressure meet the preset conditions for refrigerant recovery and recharge; If not, control the second pressure regulating mechanism to adjust the pressure inside the storage cavity; In cases where it is necessary to recover the refrigerant within the refrigeration cycle system: The step of controlling the first pressure regulating mechanism to adjust the volume of the storage cavity to a preset value includes: The first pressure regulating mechanism is controlled to expand the volume of the storage cavity to a preset value; The step of determining whether the system pressure and the cavity pressure meet the preset conditions for refrigerant recovery and recharge includes: Determine whether the cavity pressure is less than the system pressure; If so, determine whether the difference between the cavity pressure and the system pressure is greater than a first predetermined value; If the difference is greater than or equal to the first predetermined value, it is determined that the system pressure and the cavity pressure meet the preset condition; If the difference is less than the first predetermined value or if the cavity pressure is greater than or equal to the system pressure, it is determined that the system pressure and the cavity pressure do not meet the preset conditions.

2. The control method for the refrigerant recovery and charging device according to claim 1, wherein, The second pressure regulating mechanism includes: A thermoelectric cooler, disposed on the side wall of the housing, has a first working end and a second working end that can provide heat or cold. The first working end is exposed to the storage cavity. When the direction of current flowing through the thermoelectric cooler is a first direction, the first working end serves as the heating element; when the direction of current flowing through the thermoelectric cooler is a second direction, the first working end serves as the cooling element, and the first and second directions are opposite. The step of controlling the second pressure regulating mechanism to regulate the pressure inside the storage cavity includes: A current with a preset direction is passed through the semiconductor refrigeration chip, and the current flowing through the semiconductor refrigeration chip is adjusted to a first preset current value; A second determination is made to determine whether the system pressure and the cavity pressure meet the preset conditions; If not, adjust the current flowing through the semiconductor cooling chip to a second preset current value, wherein the second preset current value is greater than the first preset current value; The system pressure and the cavity pressure are determined three times to see if they meet the preset conditions. If the system pressure and the cavity pressure fail to meet the preset conditions in three separate determinations, the adjustment time elapsed during the step of adjusting the current flowing through the semiconductor cooling chip to the second preset value is obtained. Determine whether the adjustment duration is less than the preset duration; If the adjustment time is less than the preset time, return to the step of determining whether the system pressure and the cavity pressure meet the preset conditions three times; When the system pressure and the cavity pressure meet the preset conditions, the step of controlling the second pressure regulating mechanism to adjust the pressure inside the storage cavity further includes: The refrigeration cycle system and the storage cavity are connected through the ventilation mechanism.

3. The control method for the refrigerant recovery and charging device according to claim 2, wherein, The ventilation mechanism includes: The first refrigerant channel has its first end connected to the bottom of the storage cavity; A pin switch is located at the second end of the first refrigerant passage and is used to connect to the inspection port of the three-way valve of the refrigeration cycle system. The refrigerant recovery and refueling device includes: An oil separator is disposed below the storage cavity and is connected between the first end of the first refrigerant channel and the storage cavity; The ventilation mechanism also includes: The second refrigerant channel has its first end connected to the bottom of the storage cavity and its second end connected to the first refrigerant channel. The switching mechanism is located at the connection between the first refrigerant channel and the second refrigerant channel, and has a first state in which the refrigeration cycle system is connected to the oil separator when the pin switch is turned on, and a second state in which the refrigeration cycle system is connected to the second refrigerant channel. The preset flow direction is a first flow direction; and, The step of connecting the refrigeration cycle system and the storage cavity through the ventilation mechanism includes: Turn on the pin switch and adjust the switching mechanism to the first state.

4. The control method for the refrigerant recovery and charging device according to claim 2, wherein, The ventilation mechanism includes: The first refrigerant channel has its first end connected to the bottom of the storage cavity; A pin switch is located at the second end of the first refrigerant passage and is used to connect to the inspection port of the three-way valve of the refrigeration cycle system. The refrigerant recovery and refueling device includes: An oil separator is disposed below the storage cavity and is connected between the first end of the first refrigerant channel and the storage cavity; The ventilation mechanism also includes: The second refrigerant channel has its first end connected to the bottom of the storage cavity and its second end connected to the first refrigerant channel. The switching mechanism is located at the connection between the first refrigerant channel and the second refrigerant channel, and has a first state in which the refrigeration cycle system is connected to the oil separator when the pin switch is turned on, and a second state in which the refrigeration cycle system is connected to the second refrigerant channel. When it is necessary to add refrigerant to the refrigeration cycle system: The step of controlling the first pressure regulating mechanism to adjust the volume of the storage cavity to a preset value includes: The first pressure regulating mechanism is controlled to compress the volume of the storage cavity to a preset value; and, The step of determining whether the system pressure and the cavity pressure meet the preset conditions for refrigerant recovery and recharge includes: Determine whether the cavity pressure is greater than the system pressure; If so, determine whether the difference between the cavity pressure and the system pressure is greater than a second predetermined value; If the difference is greater than the second predetermined value, it is determined that the system pressure and the cavity pressure meet the preset condition; If the difference is less than or equal to the second predetermined value, or if the cavity pressure is less than or equal to the system pressure, it is determined that the system pressure and the cavity pressure do not meet the preset condition; and, The preset flow direction is the second flow direction; and, The step of connecting the refrigeration cycle system and the storage cavity through the ventilation mechanism includes: Turn on the pin switch and adjust the switching mechanism to the second state.

5. The control method for the refrigerant recovery and charging device according to claim 3, wherein, The refrigerant recovery and refueling device also includes: A filter is disposed on the first refrigerant channel and located between the switching mechanism and the oil separator; A flow meter is installed on the first refrigerant channel and located between the switching mechanism and the pin switch.

6. The control method for the refrigerant recovery and charging device according to claim 1, wherein, The refrigerant recovery and refueling device also includes: A partition is disposed between the top of the housing and the piston; and, The first pressure regulating mechanism further includes: A piston rod passes through the partition plate, with one end connected to the piston and the other end equipped with a magnetic attraction mechanism; An electromagnetic coil is disposed on the housing and is positioned opposite to the magnetic attraction mechanism; A traction spring is disposed between the magnetic attraction mechanism and the electromagnetic coil.

7. The control method for the refrigerant recovery and charging device according to claim 2, wherein, The storage cavity is located below the piston, and the piston moves in the vertical direction, while the semiconductor cooling chip is arranged in the vertical direction.

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