Exhaust method, exhaust system and electric appliance

Abstract

The invention discloses an exhaust method, an exhaust system and an electric appliance. The exhaust method comprises the following steps: setting a temperature parameter delta T1; the pressure value Pc of the first condenser and the temperature value Tca of refrigerant liquid in the first condenser are obtained; a first saturation temperature value Tc of the refrigerant liquid is calculated according to the pressure value Pc of the first condenser, delta Tc = Tc-Tca is calculated, and delta Tc and delta T1 are compared; and if the delta Tc is larger than or equal to the delta T1, the second refrigerating system is started, and the non-condensable gas in the first refrigerating system is separated and exhausted through the refrigerating device and the exhaust device. The exhaust system is used for achieving the exhaust method and comprises a first refrigerating system and a second refrigerating system which are connected, the first refrigerating system comprises a first condenser, and the second refrigerating system comprises a refrigerating device and an exhaust device which are connected. The electric appliance comprises the exhaust system. According to the exhaust method provided by the invention, the separation efficiency of the non-condensable gas can be improved, the separation effect of the non-condensable gas is enhanced, and the loss rate of a refrigerant is reduced.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to an exhaust method, an exhaust system and an electrical appliance. Background Art

[0002] In the related art, refrigeration units are usually used to achieve refrigeration, such as air conditioning. When the refrigeration unit is in operation, a low-pressure (negative pressure) area will be formed inside the refrigeration system of the refrigeration unit, making it easy for non-condensable gases such as air to enter the low-pressure (negative pressure) area of ​​the refrigeration system, thereby reducing the refrigeration efficiency of the refrigeration unit and increasing the energy consumption of the refrigeration unit.

[0003] Generally, the refrigerant gas in the refrigeration unit will mix with the non-condensable gas to form a mixed gas. In order to separate and remove the non-condensable gas in the refrigeration unit, the related technology uses the existing refrigeration cycle system of the refrigeration unit to further cool, separate and remove the mixed gas. However, on the one hand, the system circulation pressure is limited by the host application conditions, resulting in a higher cooling temperature when the mixed gas is further separated, which in turn leads to poor separation effect. On the other hand, when the system circulation pressure difference is small, the liquid supply may be insufficient, making it difficult to cool and separate the mixed gas. Summary of the invention

[0004] In order to solve at least one of the above technical problems, the present application provides an exhaust method, an exhaust system and an electrical appliance, and the technical solutions adopted are as follows.

[0005] The present application provides an exhaust method, the exhaust method is used to exhaust non-condensable gas in a first refrigeration system in an exhaust system, the exhaust system also includes a second refrigeration system connected to the first refrigeration system, the first refrigeration system includes a first condenser, and the second refrigeration system includes a connected refrigeration device and an exhaust device;

[0006] The exhaust method comprises the following steps:

[0007] Set the temperature parameter ΔT1;

[0008] Acquire a pressure value Pc of the first condenser and a temperature value Tca of the refrigerant liquid in the first condenser;

[0009] Calculate the first saturation temperature value Tc of the refrigerant liquid according to the pressure value Pc of the first condenser, calculate ΔTc=Tc-Tca, and compare ΔTc with ΔT1;

[0010] If ΔTc≥ΔT1, the second refrigeration system is started, and the non-condensable gas in the first refrigeration system is separated and discharged through the refrigeration device and the exhaust device.

[0011] In some embodiments of the present application, the second refrigeration system includes a gas tank, the gas tank is used to store the mixed gas exhausted from the first refrigeration system, the mixed gas includes refrigerant gas and non-condensable gas, the refrigeration device and the exhaust device are both connected to the gas tank, starting the second refrigeration system, and separating and exhausting the non-condensable gas in the first refrigeration system through the refrigeration device and the exhaust device includes:

[0012] discharging the mixed gas in the first refrigeration system into the gas tank;

[0013] Starting the refrigeration device to condense the refrigerant gas in the mixed gas in the gas tank to form a refrigerant liquid in the gas tank;

[0014] The exhaust device is activated to exhaust the non-condensable gas in the gas tank.

[0015] In certain embodiments of the present application, the refrigeration device includes a second evaporator, a second compressor, a second condenser, and a second throttle valve that are sequentially connected and constitute a cooling cycle loop, the second compressor, the second condenser, and the second throttle valve are arranged outside the gas tank, the second evaporator is arranged inside the gas tank, and the refrigerant in the second evaporator is used to exchange heat with the refrigerant gas in the gas tank. Before starting the exhaust device, the exhaust method further includes:

[0016] Set temperature parameter T1;

[0017] Obtaining a temperature value T2 of the refrigerant after leaving the gas tank and before entering the second compressor;

[0018] Starting the exhaust device to exhaust the non-condensable gas in the gas tank includes:

[0019] Compare T2 with T1. If T2<T1, shut down the refrigeration device and start the exhaust device to exhaust air.

[0020] In some embodiments of the present application, after starting the refrigeration device, the exhaust method further includes:

[0021] Re-acquire Pc and Tca;

[0022] Calculate Tc again based on Pc, calculate ΔTc=Tc-Tca, and compare ΔTc with ΔT1;

[0023] If ΔTc<ΔT1, the refrigeration device is turned off.

[0024] In some embodiments of the present application, before closing the exhaust device, the exhaust method further includes:

[0025] Set temperature parameter ΔT2;

[0026] Obtaining a pressure value Pp of the gas tank and a temperature value Tpa of the refrigerant liquid in the gas tank;

[0027] The second saturation temperature value Tp of the refrigerant liquid is calculated according to the pressure value Pp of the gas tank, and ΔTp=Tp-Tpa is calculated;

[0028] After starting the exhaust device, the exhaust method further includes:

[0029] Compare the magnitudes of ΔTp and ΔT2. If ΔTp<ΔT2, close the exhaust device to stop exhausting.

[0030] In some embodiments of the present application, after closing the exhaust device, the exhaust method further includes:

[0031] The refrigerant liquid in the gas tank is transported back to the first refrigeration system.

[0032] In some embodiments of the present application, the exhaust device includes an air pump and a first valve, and the gas tank is connected to the air pump through the first valve.

[0033] In certain embodiments of the present application, the second refrigeration system further includes an air inlet pipeline, a liquid return pipeline, a second valve and a third valve. The gas tank is connected to the first condenser through the liquid return pipeline, and the second valve is provided on the liquid return pipeline. The gas tank is also connected to the first condenser through the air inlet pipeline, and the third valve is provided on the air inlet pipeline.

[0034] The present application also provides an exhaust system, which is used to implement the above exhaust method.

[0035] The present application also provides an electrical appliance, which includes the above-mentioned exhaust system.

[0036] The embodiments of the present application have at least the following beneficial effects: the exhaust system in the embodiments of the present application separates and discharges the non-condensable gases in the first refrigeration system by setting up a second refrigeration system. The system circulation pressure is not limited to the first refrigeration system, and the second refrigeration system can be controlled more accurately and flexibly. The separation efficiency of the non-condensable gases can be improved, the separation effect of the non-condensable gases can be enhanced, and the loss rate of the refrigerant can be reduced. The exhaust method in the embodiments of the present application uses ΔTc as an indicator for determining the non-condensable gas content in the first condenser, which can improve the accuracy of determining the non-condensable gas content, and is conducive to determining whether to turn on the second refrigeration system for exhaust. The second refrigeration system does not need to be in the on state all the time, and energy consumption can be reduced while ensuring the refrigeration effect and efficiency of the first refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The aspects and advantages described and / or attached in the embodiments of the present application will become apparent and easy to understand in conjunction with the following drawings. It should be noted that the embodiments embodied in the following drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0038] Figure 1 A schematic diagram of the structure of the exhaust system provided in an embodiment of the present application;

[0039] Figure 2 A flow chart of an exhaust method provided in an embodiment of the present application;

[0040] Figure 3 A logic control diagram of the exhaust method provided in an embodiment of the present application.

[0041] Figure numerals: first refrigeration system 100, first condenser 110, first compressor 120, first evaporator 130, first throttle valve 140; second refrigeration system 200, second condenser 211, second compressor 212, second evaporator 213, second throttle valve 214, condensing fan 215, gas tank 220, vacuum pump 231, first valve 232, air intake pipeline 241, third valve 242, liquid return pipeline 251, second valve 252. DETAILED DESCRIPTION

[0042] Combine the following Figures 1 to 3 Embodiments of the present application are described in detail, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0043] In the description of the present application, it should be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] See also Figure 1 The embodiment of the present application provides an exhaust system, which can be used to implement the following exhaust method. Exemplarily, the exhaust system includes a first refrigeration system 100 and a second refrigeration system 200 connected to each other, the first refrigeration system 100 includes a first condenser 110, and the second refrigeration system 200 includes a connected refrigeration device and an exhaust device.

[0046] For example, see Figure 2 The embodiment of the present application provides an exhaust method, which is used for exhausting non-condensable gas from the first refrigeration system in the above-mentioned exhaust system. The exhaust method comprises the following steps:

[0047] Step S110: setting a temperature parameter ΔT1;

[0048] Step S120: obtaining a pressure value Pc of the first condenser 110 and a temperature value Tca of the refrigerant liquid in the first condenser 110;

[0049] Step S130: Calculate the first saturation temperature value Tc of the refrigerant liquid according to the pressure value Pc of the first condenser 110, calculate ΔTc=Tc-Tca, and compare ΔTc with ΔT1;

[0050] Step S140: If ΔTc≥ΔT1, the second refrigeration system 200 is started, and the non-condensable gas in the first refrigeration system 100 is separated and discharged through the refrigeration device and the exhaust device.

[0051] Optionally, a first pressure sensor and a first temperature sensor are provided in the first condenser 110, and the pressure value Pc of the first condenser 110 can be measured by the first pressure sensor, and the temperature value Tca of the refrigerant liquid in the first condenser 110 can be measured by the first temperature sensor.

[0052] It should be noted that when non-condensable gas (such as air, etc.) enters the first refrigeration system 100 and converges at the top of the condenser, the pressure value in the condenser will increase to Pc, and the first saturation temperature value Tc of the refrigerant liquid calculated based on Pc will also be higher than the actual temperature value Tca of the refrigerant liquid in the first condenser 110, and the more non-condensable gas in the condenser, the greater ΔTc. Therefore, ΔTc can be used as an indicator to determine the content of non-condensable gas in the first condenser 110. It can be understood that the temperature parameter ΔT1 can be a specific value or a range value, and the specific size of ΔT1 can be adjusted according to the actual application scenario, and no specific limitation is made here.

[0053] The exhaust system in the embodiment of the present application separates and discharges the non-condensable gas in the first refrigeration system 100 by setting up a second refrigeration system 200. The system circulation pressure is not limited by the first refrigeration system 100, and the second refrigeration system 200 can be controlled more accurately and flexibly. The separation efficiency of the non-condensable gas can be improved, the separation effect of the non-condensable gas can be enhanced, and the loss rate of the refrigerant can be reduced. The exhaust method in the embodiment of the present application uses ΔTc as an indicator for determining the non-condensable gas content in the first condenser 110, which can improve the accuracy of determining the non-condensable gas content, and is conducive to determining whether to turn on the second refrigeration system 200 for exhaust. The second refrigeration system 200 does not need to be in the on state all the time, and energy consumption can be reduced while ensuring the refrigeration effect and efficiency of the first refrigeration system 100.

[0054] Optionally, in some embodiments, the second refrigeration system 200 includes a gas tank 220, which is used to store a mixed gas exhausted from the first refrigeration system 100, wherein the mixed gas includes a refrigerant gas and a non-condensable gas, and both the refrigeration device and the exhaust device are connected to the gas tank 220.

[0055] Optionally, in some embodiments, the step S140 of “starting the second refrigeration system 200, and separating and discharging the non-condensable gas in the first refrigeration system 100 through the refrigeration device and the exhaust device” includes:

[0056] Step S141: discharging the mixed gas in the first refrigeration system 100 into the gas tank 220;

[0057] Step S142: starting the refrigeration device to condense the refrigerant gas in the mixed gas in the gas tank 220 to form a refrigerant liquid in the gas tank 220, thereby separating the refrigerant gas from the non-condensable gas in the mixed gas;

[0058] Step S143: Start the exhaust device to exhaust the non-condensable gas in the gas tank 220.

[0059] Optionally, in some embodiments, the refrigeration device includes a second evaporator 213, a second compressor 212, a second condenser 211, and a second throttle valve 214 which are connected in sequence and form a cooling cycle. The second compressor 212, the second condenser 211, and the second throttle valve 214 are arranged outside the gas tank, and the second evaporator 213 is arranged inside the gas tank. The refrigerant in the second evaporator 213 is used to exchange heat with the refrigerant gas in the gas tank 220, so that the refrigerant gas in the gas tank 220 condenses to form a refrigerant liquid. Optionally, the second evaporator 213 is an evaporation coil.

[0060] Optionally, the refrigeration device further includes a condensing fan 215 , and the condensing fan 215 is disposed close to the second condenser 211 to further enhance the condensation effect of the second condenser 211 .

[0061] Optionally, in some embodiments, before starting the exhaust device in step S143, the exhaust method further includes the following steps:

[0062] Set temperature parameter T1;

[0063] The temperature value T2 of the refrigerant after leaving the gas tank 220 and before entering the second compressor 212 is obtained.

[0064] Exemplarily, step S110 further includes: setting a temperature parameter T1.

[0065] Step S120 also includes: obtaining a temperature value T2 of the refrigerant after leaving the gas tank 220 and before entering the second compressor 212 .

[0066] Optionally, the second evaporator 213 is connected to the second compressor 212 through the first pipeline, and the refrigerant enters the second compressor 212 from the second evaporator 213 through the first pipeline. Optionally, a second temperature sensor can be set in the first pipeline between the gas tank 220 and the second compressor 212, and T2 can be measured by the second temperature sensor. The temperature parameter T1 can be a specific value or a range value. The specific size of T1 can be adjusted according to the actual application scenario, and no specific limitation is made here.

[0067] Optionally, in some embodiments, the step S143 includes: comparing T2 with T1, if T2<T1, shutting down the refrigeration device, and starting the exhaust device to exhaust air.

[0068] Optionally, in some embodiments, after starting the refrigeration device in step S142, the exhaust method further includes the following steps:

[0069] Step S150: Return to steps S120 and S130, i.e. reacquire Pc and Tca; calculate Tc again based on Pc, calculate ΔTc=Tc-Tca, compare ΔTc with ΔT1; if ΔTc<ΔT1, turn off the refrigeration device.

[0070] Optionally, the above steps S120 to S140 may be repeated until ΔTc<ΔT1.

[0071] Optionally, in some embodiments, before closing the exhaust device, the exhaust method further comprises:

[0072] Set temperature parameter ΔT2;

[0073] Obtaining the pressure value Pp of the gas tank 220 and the temperature value Tpa of the refrigerant liquid in the gas tank 220;

[0074] The second saturation temperature value Tp of the refrigerant liquid is calculated based on the pressure value Pp of the gas tank 220, and ΔTp=Tp-Tpa is calculated.

[0075] Optionally, a second pressure sensor and a third temperature sensor are further provided in the gas tank 220. The pressure value Pp of the gas tank 220 can be measured by the second pressure sensor, and the temperature value Tpa of the refrigerant liquid in the gas tank 220 can be measured by the third temperature sensor.

[0076] Exemplarily, the above step S110 further includes: setting a temperature parameter ΔT2.

[0077] The above step S120 also includes: obtaining a pressure value Pp of the gas tank 220 and a temperature value Tpa of the refrigerant liquid in the gas tank 220 .

[0078] The above step S130 also includes: calculating the second saturation temperature value Tp of the refrigerant liquid according to the pressure value Pp of the gas tank 220, ΔTp=Tp-Tpa.

[0079] It is understandable that the temperature parameter ΔT2 can be a specific value or a range value, and the specific value of ΔT2 can be adjusted according to the actual application scenario, and no specific limitation is made here.

[0080] After the exhaust device is started in step S143, the exhaust method further includes:

[0081] Step S160: Compare ΔTp with ΔT2. If ΔTp<ΔT2, close the exhaust device to stop exhaust.

[0082] Optionally, the above step S160 occurs after step S150.

[0083] Optionally, in some embodiments, after the exhaust device is turned off in step 160, the exhaust method further includes the following steps:

[0084] Step S170 : transporting the refrigerant liquid in the gas tank 220 back to the first refrigeration system 100 .

[0085] By liquefying the refrigerant gas to separate the refrigerant gas from the non-condensable gas in the mixed gas, and then transporting the liquefied refrigerant liquid back to the first refrigeration system 100, the utilization rate of the refrigerant in the first refrigeration system 100 can be improved and the loss can be reduced.

[0086] Optionally, in some embodiments, the above step S170 includes:

[0087] Step S171: setting liquid level parameters H1 and H2, H1>H2;

[0088] Step S172: Obtain the liquid level height value H in the gas tank 220. If H≥H1, the refrigerant liquid is transported back to the first refrigeration system 100 until H=H2.

[0089] It can be understood that the liquid level parameters H1 and H2 can be a specific value or a range value. The specific values ​​of H1 and H2 can be adjusted according to the actual application scenario and are not specifically limited here.

[0090] Optionally, in some embodiments, the exhaust device also includes an exhaust pump 231 and a first valve 232. The upper end of the gas tank 220 is connected to the exhaust pump 231 through the first valve 232. The non-condensable gas in the gas tank 220 can be extracted by starting the exhaust pump 231 and opening the first valve 232.

[0091] Optionally, in some embodiments, the second refrigeration system 200 further includes an air intake line 241, a liquid return line 251, a second valve 252, and a third valve 242. The lower end of the gas tank 220 is connected to the first condenser 110 through the liquid return line 251, and the second valve 252 is provided on the liquid return line 251. The lower end of the gas tank 220 is also connected to the first condenser 110 through the air intake line 241, and the third valve 242 is provided on the air intake line 241. The mixed gas in the first condenser 110 enters the gas tank 220 through the air intake line 241, and the refrigerant liquid in the gas tank 220 enters the first condenser 110 through the liquid return line 251.

[0092] Optionally, the first valve 232, the second valve 252 and the third valve 242 are all electric valves. Optionally, a suction device may be provided in the gas tank 220 to draw the mixed gas in the first condenser 110 into the gas tank 220. Optionally, the suction device may be an air pump.

[0093] Optionally, a first float liquid level switch is provided at a height of H1 in the gas tank 220, and a second float liquid level switch is provided at a height of H2. The first float liquid level switch and the second float liquid level switch are both electrically connected to the second valve 252, and the first valve 232, the second compressor 212 and the vacuum pump 231 are all electrically connected to the first float liquid level switch.

[0094] When the liquid level of the refrigerant liquid in the gas tank 220 reaches H1, the first float liquid level switch is triggered, the first valve 232, the second compressor 212 and the vacuum pump 231 are closed in response to the first float liquid level switch, and the second valve 252 is opened in response to the first float liquid level switch, so that the refrigerant liquid in the gas pipe flows back to the first condenser 110 through the return liquid pipeline 251. When the liquid level of the refrigerant liquid in the gas tank 220 reaches H2, the second valve 252 is closed in response to the second float liquid level switch.

[0095] Optionally, in some embodiments, the first refrigeration system 100 also includes a first compressor 120, a first throttle valve 140 and a first evaporator 130, the condenser is respectively connected to the first compressor 120 and the first throttle valve 140, and the first compressor 120 and the first throttle valve 140 are respectively connected to the first evaporator 130 to form a refrigeration cycle.

[0096] Optionally, in some embodiments, the exhaust method further comprises the following steps:

[0097] Step S180: Set the temperature parameter T3, obtain the temperature value T4 of the refrigerant after leaving the second throttle valve 214 and before entering the gas tank 220, if T4 ≥ T3 within the first preset time, then determine that the refrigeration device is faulty.

[0098] Optionally, in some embodiments, the second evaporator 213 is connected to the second throttle valve 214 through a second pipeline, and the refrigerant flows from the second throttle valve 214 through the second pipeline into the second evaporator 213. Optionally, a fourth temperature sensor may be provided in the second pipeline between the second throttle valve 214 and the gas tank 220, and T4 may be measured by the fourth temperature sensor.

[0099] It should be noted that when the refrigeration device fails such as leaking, blocking, or component abnormalities, the refrigeration effect will be poor and the temperature of T4 will increase. Based on this, the refrigeration device failure can be judged according to T4≥T3.

[0100] Step S190: When the exhaust device does not operate within the second preset time, the second refrigeration system 200 may be stopped within the third preset time, and then started within the fourth preset time to optimize the operation of the second refrigeration system 200.

[0101] Optionally, the first preset time, the second preset time, the third preset time and the fourth preset time are all range values, and their specific values ​​can be adjusted according to actual needs, and no specific limitation is made here.

[0102] In a specific embodiment, see Figure 3 , the exhaust method comprises the following steps:

[0103] Step S210: Setting parameters ΔT1, ΔT2, T1, H1 and H2.

[0104] Step S220: Obtain the pressure value Pc of the first condenser 110, the temperature value Tca of the refrigerant liquid in the first condenser 110, the pressure value Pp of the gas tank 220, the temperature value Tpa of the refrigerant liquid in the gas tank 220, and the temperature value T2 of the refrigerant after leaving the gas tank 220 and before entering the second compressor 212.

[0105] Step S230: Calculate the first saturation temperature value Tc of the refrigerant liquid according to the pressure value Pc of the first condenser 110, ΔTc=Tc-Tca; calculate the second saturation temperature value Tp of the refrigerant liquid according to the pressure value Pp of the gas tank 220, ΔTp=Tp-Tpa, and determine whether ΔTc≥ΔT1 is established.

[0106] Step S240: If ΔTc≥ΔT1 is established, start the refrigeration device; determine whether T2<T1 is established. If T2<T1 is established, close the refrigeration device and the third valve 242, start the exhaust device to exhaust, and then return to step S220; if not established, directly return to step S220.

[0107] Step S250: If ΔTc≥ΔT1 is not established, the refrigeration device is turned off, and it is determined whether ΔTp<ΔT2 is established;

[0108] If ΔTp<ΔT2 is established, the exhaust device is closed, and it is determined whether the liquid level value H≥H1 in the gas tank 220 is established;

[0109] If H≥H1 is established, the second valve 252 and the third valve 242 are opened, and the refrigerant liquid in the gas tank 220 is refluxed into the first condenser 110 by opening the second valve 252 until the liquid level height value H in the gas tank 220 drops to H2, and then the second valve 252 is closed and the process returns to step S220;

[0110] If H≥H1 is not true, then continue to determine whether H≤H2 is true. If H≤H2 is true, close the second valve 252 and return to step S220; if H≤H2 is not true, directly return to step S220.

[0111] The embodiment of the present application further provides an electrical appliance, comprising the above-mentioned exhaust system. Optionally, the electrical appliance may be an air conditioner, and of course the electrical appliance may also be a refrigerator or other electrical appliances with refrigeration function, which is not specifically limited here.

[0112] In the description of this specification, if the reference terms "one embodiment", "some examples", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0113] The above describes the implementation methods of the present application in detail in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

[0114] In the description of this application, if "," appears in the patent name, it means an "and" relationship, not an "or" relationship. For example, if the patent name is "a kind of A, a kind of B", it means that the content protected by this application is: the technical solution with the subject name A and the technical solution with the subject name B.

Claims

1. Exhaust method, Features: The exhaust method is used to exhaust non-condensable gas in a first refrigeration system in an exhaust system, the exhaust system also includes a second refrigeration system connected to the first refrigeration system, the first refrigeration system includes a first condenser, and the second refrigeration system includes a connected refrigeration device and an exhaust device; The exhaust method comprises the following steps: Set the temperature parameter ΔT1; Acquire a pressure value Pc of the first condenser and a temperature value Tca of the refrigerant liquid in the first condenser; Calculate the first saturation temperature value Tc of the refrigerant liquid according to the pressure value Pc of the first condenser, calculate ΔTc=Tc-Tca, and compare ΔTc with ΔT1; If ΔTc≥ΔT1, the second refrigeration system is started, and the non-condensable gas in the first refrigeration system is separated and discharged through the refrigeration device and the exhaust device.

2. The exhaust method according to claim 1, Features: The second refrigeration system includes a gas tank, the gas tank is used to store the mixed gas exhausted from the first refrigeration system, the mixed gas includes refrigerant gas and non-condensable gas, the refrigeration device and the exhaust device are both connected to the gas tank, the second refrigeration system is started, and the non-condensable gas in the first refrigeration system is separated and exhausted through the refrigeration device and the exhaust device, including: discharging the mixed gas in the first refrigeration system into the gas tank; Starting the refrigeration device to condense the refrigerant gas in the mixed gas in the gas tank to form a refrigerant liquid in the gas tank; The exhaust device is activated to exhaust the non-condensable gas in the gas tank.

3. The exhaust method according to claim 2, Features: The refrigeration device comprises a second evaporator, a second compressor, a second condenser and a second throttle valve which are connected in sequence and constitute a cooling circulation loop, the second compressor, the second condenser and the second throttle valve are arranged outside the gas tank, the second evaporator is arranged inside the gas tank, the refrigerant in the second evaporator is used for heat exchange with the refrigerant gas in the gas tank, and before starting the exhaust device, the exhaust method further comprises: Set temperature parameter T1; Obtaining a temperature value T2 of the refrigerant after leaving the gas tank and before entering the second compressor; Starting the exhaust device to exhaust the non-condensable gas in the gas tank includes: Compare T2 with T1. If T2<T1, shut down the refrigeration device and start the exhaust device to exhaust air.

4. The exhaust method according to claim 2, Features: After starting the refrigeration device, the exhaust method further comprises: Re-acquire Pc and Tca; Calculate Tc again based on Pc, calculate ΔTc=Tc-Tca, and compare ΔTc with ΔT1; If ΔTc<ΔT1, the refrigeration device is turned off.

5. The exhaust method according to claim 2, Features: Before closing the exhaust device, the exhaust method further comprises: Set temperature parameter ΔT2; Obtaining a pressure value Pp of the gas tank and a temperature value Tpa of the refrigerant liquid in the gas tank; The second saturation temperature value Tp of the refrigerant liquid is calculated according to the pressure value Pp of the gas tank, and ΔTp=Tp-Tpa is calculated; After starting the exhaust device, the exhaust method further includes: Compare the magnitudes of ΔTp and ΔT2. If ΔTp<ΔT2, close the exhaust device to stop exhausting.

6. The exhaust method according to claim 5, Features: After closing the exhaust device, the exhaust method further comprises: The refrigerant liquid in the gas tank is transported back to the first refrigeration system.

7. The exhaust method according to claim 2, Features: The exhaust device comprises an air extraction pump and a first valve, and the gas tank is connected to the air extraction pump via the first valve.

8. The exhaust method according to claim 2, Features: The second refrigeration system also includes an air inlet pipeline, a liquid return pipeline, a second valve and a third valve. The gas tank is connected to the first condenser through the liquid return pipeline, and the second valve is arranged on the liquid return pipeline. The gas tank is also connected to the first condenser through the air inlet pipeline, and the third valve is arranged on the air inlet pipeline.

9. Exhaust system, Features: The exhaust system is used to implement the exhaust method according to any one of claims 1 to 8.

10. Electrical appliances, Features: The appliance comprises the exhaust system of claim 9.

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