Air conditioning system

Abstract

The utility model discloses an air-conditioning system, which comprises an outdoor unit, an indoor unit, an indoor unit and an outdoor unit, a plurality of electronic elements are arranged in the electric control box; the compressor is connected with the outdoor heat exchanger through the four-way valve; an indoor unit including: an indoor heat exchanger serving as an evaporator or a condenser; the heat dissipation module comprises a heat dissipation branch, the heat dissipation branch is arranged between the outdoor heat exchanger and the indoor heat exchanger, and part of the heat dissipation branch exchanges heat with the electric control box; the heat dissipation adjusting element is arranged on the heat dissipation branch and used for adjusting the flow of the refrigerant in the heat dissipation branch; and the compensation branch is arranged between the exhaust side of the compressor and the heat dissipation branch, and the compensation branch allows part of refrigerant on the exhaust side of the compressor to be introduced into the heat dissipation branch. By configuring the heat dissipation branch and the compensation branch, temperature compensation is rapidly carried out in the refrigeration mode and when the humidity is high, and the condensation problem of refrigerant heat dissipation is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioning technology field especially relates to a kind of air conditioning system. BACKGROUND

[0002] Many electronic components are arranged inside the electric appliance box (also called electric control box) in air conditioning system, these electronic components heat when working, so that the temperature of the electric appliance box environment is high;And electronic components work under high temperature can cause performance degradation, service life is shortened, there is also security risk.Therefore, the electric appliance box needs to be cooled, common cooling methods include: natural convection cooling, forced convection cooling and liquid cooling and so on.

[0003] Prior art discloses the technical scheme of liquid cooling, for example, the technical scheme disclosed in Chinese patent application (CN109341131A) is as follows: "the air conditioner includes four-way valve, indoor heat exchanger and outdoor throttling component;Indoor heat exchanger and outdoor throttling component are connected in series between indoor throttling component and controller cooling module, wherein, four-way valve and indoor heat exchanger and indoor throttling component and controller cooling module between connecting branch, the branch is provided with air supplement throttling component.Therefore, high-temperature and high-pressure refrigerant and medium-temperature and medium-pressure refrigerant are mixed with each other, so that the temperature of the refrigerant entering the controller cooling module is increased, the stable control of electric controller temperature is realized, and the electric controller condensation is avoided. "

[0004] The scheme disclosed in prior art can solve the condensation problem caused by liquid cooling when air conditioning system runs in heating mode and the refrigerant is less.However, liquid cooling condensation is more likely to occur when air conditioning system runs in cooling mode, especially in the case of high ambient temperature and high humidity, the technical scheme in prior art cannot solve this problem.

[0005] The above information disclosed in the background is only used to increase the understanding of the background of the present application, therefore, it can include prior art known by those skilled in the art. UTILITY MODEL CONTENT

[0006] In view of the problem that liquid cooling condensation is more likely to occur when air conditioning system runs in cooling mode, especially in the case of high ambient temperature and high humidity, a kind of air conditioning system is designed and provided.

[0007] In some embodiments of the present application, an air conditioning system comprises: an outdoor unit comprising: an outdoor heat exchanger serving as a condenser or an evaporator; an electronic control box in which a plurality of electronic components are arranged; a compressor connected to the outdoor heat exchanger through a four-way valve; an indoor unit comprising: an indoor heat exchanger serving as an evaporator or a condenser; further comprising: a heat dissipation branch, the heat dissipation branch being arranged between the outdoor heat exchanger and the indoor heat exchanger, the heat dissipation branch being in heat exchange with the electronic control box; and a heat dissipation adjustment element arranged on the heat dissipation branch, the heat dissipation adjustment element being used to adjust the flow of refrigerant in the heat dissipation branch; and a compensation branch arranged between the discharge side of the compressor and the heat dissipation branch, the compensation branch allowing part of the refrigerant on the discharge side of the compressor to be introduced into the heat dissipation branch.

[0008] The above technical solution has the following advantages or beneficial effects: by configuring the heat dissipation branch and the compensation branch, the present application can quickly compensate for temperature when in refrigeration mode and when humidity is high, solving the condensation problem of refrigerant heat dissipation.

[0009] In some embodiments of the present application, the compensation branch is further configured to allow part of the refrigerant in the heat dissipation branch to be introduced into the discharge side of the compressor.

[0010] The above technical solution has the following advantages or beneficial effects: by configuring the compensation branch, the refrigerant in the heat dissipation branch can also be used to compensate for the pressure on the discharge side of the compressor in refrigeration mode, avoiding shutdown caused by excessively low pressure on the discharge side of the compressor.

[0011] In some embodiments of the present application, a compensation valve is arranged on the compensation branch, the compensation valve being configured to open a fluid passage of the compensation branch to allow part of the refrigerant on the discharge side of the compressor to flow into the heat dissipation branch through the fluid passage of the compensation branch, or to allow part of the refrigerant in the heat dissipation branch to flow into the discharge side of the compressor through the fluid passage of the compensation branch.

[0012] The above technical solution has the following advantages or beneficial effects: by arranging the compensation valve, the flow of refrigerant between the discharge side of the compressor and the heat dissipation branch can be flexibly adjusted according to actual needs.

[0013] In some embodiments of the present application, the outdoor unit further comprises: a pressure relief branch arranged between the discharge side and the suction side of the compressor, the pressure relief branch being configured to allow part of the refrigerant on the discharge side of the compressor to flow to the suction side of the compressor.

[0014] The above technical solution has the following advantages or beneficial effects: by designing the pressure relief branch, the pressure of the refrigeration cycle is adjusted, and the system components are protected.

[0015] In some embodiments of the present application, a pressure relief valve is arranged on the pressure relief branch, and the pressure relief valve is configured to open the fluid passage of the pressure relief branch to allow part of the refrigerant on the exhaust side of the compressor to flow to the suction side of the compressor through the fluid passage of the pressure relief branch.

[0016] The above technical solution has the following advantages or beneficial effects: by arranging the pressure relief valve, the pressure relief process can be flexibly controlled to prevent overloading and improve the operation stability and service life of the compressor.

[0017] In some embodiments of the present application, the outdoor unit further comprises: a gas-liquid separator arranged on the suction side of the compressor; the inlet of the pressure relief branch is connected to the compensation branch, and the outlet of the pressure relief branch is connected to the gas-liquid separator.

[0018] The above technical solution has the following advantages or beneficial effects: by designing the pressure relief branch, the influence on the main refrigerant flow path is minimized, and the pressure relief efficiency is improved.

[0019] In some embodiments of the present application, the outdoor unit further comprises: a supercooling heat exchanger arranged between the outdoor heat exchanger and the indoor heat exchanger; the heat dissipation branch is connected to one fluid passage of the supercooling heat exchanger, and the other fluid passage of the supercooling heat exchanger is connected to the gas-liquid separator through a cold throttling element.

[0020] The above technical solution has the following advantages or beneficial effects: by the supercooling heat exchanger, the operation efficiency of the air conditioning system is further improved.

[0021] In some embodiments of the present application, the outdoor unit further comprises: a first detection unit for monitoring the temperature of the electric control box to output a temperature detection signal; a comparison circuit for outputting a first driving signal when the temperature detection signal is higher than a preset temperature threshold signal, or outputting a second driving signal when the temperature detection signal is lower than the preset temperature threshold signal; and a controller receiving the first driving signal to drive the heat dissipation adjusting element to act to increase the refrigerant flow in the heat dissipation branch, or receiving the second driving signal to drive the heat dissipation adjusting element to act to decrease the refrigerant flow in the heat dissipation branch.

[0022] The above technical solution has the following advantages or beneficial effects: by the first detection unit, the second detection unit, the comparison circuit and the controller, the refrigerant flow in the heat dissipation branch can be automatically adjusted according to the temperature detection signal to ensure that the electric control box works in a suitable temperature range.

[0023] In some embodiments of the present application, the outdoor unit further comprises: a first detection unit for monitoring the temperature of the electric control box to output a temperature detection signal; a second detection unit for monitoring the dew point temperature of the electric control box to output a dew point temperature detection signal; and a comparison circuit for outputting a first compensation driving signal when the temperature detection signal is lower than the dew point temperature detection signal; and a controller receiving the first compensation driving signal to drive the compensation valve to open the fluid passage of the compensation branch to allow part of the refrigerant on the exhaust side of the compressor to flow into the heat dissipation branch through the fluid passage of the compensation branch.

[0024] The above technical solution has the following advantages or beneficial effects: by setting the first detection unit and the second detection unit to monitor the temperature and the dew point temperature of the electric control box respectively, and combining the comparison circuit and the controller, the compensation valve can be automatically opened when the temperature of the electric control box is lower than the dew point temperature, allowing part of the refrigerant on the exhaust side of the compressor to flow into the heat dissipation branch, thereby effectively preventing the condensation phenomenon inside the electric control box, improving the working stability and reliability of the electric control box, and prolonging the service life of the equipment.

[0025] In some embodiments of the present application, the outdoor unit further comprises: a suction pressure detection unit for detecting the pressure on the suction side of the compressor to generate a suction pressure detection signal; an exhaust pressure detection unit for detecting the pressure on the exhaust side of the compressor to generate an exhaust pressure detection signal; a comparison circuit for comparing the suction pressure detection signal and a reference suction pressure signal, and the exhaust pressure detection signal and a reference exhaust pressure signal, respectively; a logic circuit for generating a second compensation driving signal based on the output of the comparison circuit; and a controller receiving the second compensation driving signal to drive the compensation valve to open the fluid passage of the compensation branch to allow part of the refrigerant in the heat dissipation branch to flow into the exhaust side of the compressor through the fluid passage of the compensation branch in the refrigeration mode.

[0026] The above technical solution has the following advantages or beneficial effects: by setting the suction pressure detection unit and the exhaust pressure detection unit, the pressures on the suction side and the exhaust side of the compressor are monitored in real time, and combining the comparison circuit and the logic circuit, the opening and closing of the compensation valve can be automatically adjusted according to the pressure detection signal in the refrigeration mode, thereby optimizing the flow of refrigerant between the heat dissipation branch and the exhaust side of the compressor.

[0027] Other features and advantages of the present application will become more apparent after reading the detailed description of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor under the premise of not paying.

[0029] Figure 1 The structural schematic diagram of the air conditioning system provided by some embodiments of the present application is shown in the figure.

[0030] Figure 2 The structural schematic diagram of the air conditioning system provided by some embodiments of the present application is shown in the figure.

[0031] Figure 3 The structural schematic diagram of the air conditioning system provided by some embodiments of the present application is shown in the figure.

[0032] Figure 4 The structural schematic diagram of the air conditioning system provided by some embodiments of the present application is shown in the figure.

[0033] Figure 5 The structural schematic diagram of the air conditioning system provided by some embodiments of the present application is shown in the figure.

[0034] Figure 6 The structural schematic diagram of the air conditioning system provided by some embodiments of the present application is shown in the figure.

[0035] Figure 7 The structural schematic diagram of the air conditioning system provided by some embodiments of the present application is shown in the figure.

[0036] Figure 8 The structural schematic diagram of the air conditioning system provided by some embodiments of the present application is shown in the figure.

[0037] Figure 9 The structural schematic diagram of the air conditioning system provided by some embodiments of the present application is shown in the figure.

[0038] Figure 10 The structural schematic diagram of the air conditioning system provided by some embodiments of the present application is shown in the figure.

[0039] In the figure: 1, compressor; 2, gas-liquid separator; 3, oil separator; 4, four-way valve; 5, shunt pipe; 6, outdoor heat exchanger; 7, shunt capillary; 8, outdoor fan; 9, shunt; 10, outdoor electronic expansion valve; 11, subcooling heat exchanger; 12, subcooling throttling element; 13, liquid-side stop valve; 14, pressure relief valve; 15, pressure relief capillary; 16, oil return capillary; 17, compensating valve; 18, indoor heat exchanger; 19, indoor fan; 20, gas-side stop valve; 21, heat dissipation adjusting element; 22, first detection unit; 23, heat dissipation module; 24, second detection unit;

[0040] 100, outdoor unit; 200, indoor unit; 101, heat dissipation branch; 102, heat dissipation part; 103, compensating branch; 104, pressure relief branch. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0042] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] The terms "first", "second", are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "a plurality of" means two or more.

[0044] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature, which includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature is "under", "below" and "underneath" the second feature, which includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0046] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. For the purpose of simplifying the present application, the components and settings of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0047] The following refers to the accompanying drawings Figures 1 to 10 The embodiments of the air conditioning system provided in the present application are described.

[0048] The air conditioning system includes performing a refrigeration cycle of the air conditioning system by using a compressor, a condenser, a throttling element and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and refrigeration or heating of an indoor space.

[0049] The low-temperature and low-pressure refrigerant enters the compressor, which compresses the refrigerant gas into a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0050] The throttling element (for example, an electronic expansion valve) expands the high-temperature and high-pressure state liquid phase refrigerant condensed in the condenser into a low-pressure liquid phase refrigerant. The evaporator evaporates the refrigerant expanded in the electronic expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by exchanging heat with the material to be cooled by using the latent heat of evaporation of the refrigerant. Throughout the cycle, the air conditioning system can adjust the temperature of the indoor space.

[0051] As Figure 1As shown, the air conditioning outdoor unit 100 refers to the part of the refrigerant cycle including the compressor 1 and the outdoor heat exchanger 6, and the air conditioning indoor unit 200 includes the indoor heat exchanger 18. Electronic expansion valves can be installed in the outdoor unit 100 and / or the indoor unit 200.

[0052] The indoor heat exchanger 18 and the outdoor heat exchanger 6 serve as condensers or evaporators. When the indoor heat exchanger 18 serves as a condenser, the air conditioning system functions as a heater in heating mode; when the indoor heat exchanger 18 serves as an evaporator, the air conditioning system functions as a cooler in cooling mode.

[0053] The air conditioning outdoor unit 100 also includes an outdoor fan 8 for expelling heat or cold to the outdoor environment. In cooling mode, the outdoor fan 8 drives air flow through the condenser so that the refrigerant in the condenser exchanges heat with the air; in heating mode, the outdoor fan 8 drives air flow through the evaporator so that the refrigerant in the evaporator exchanges heat with the air. The outdoor fan 8 includes a motor and fan blades, the motor drives the fan blades to rotate, and the fan blades are axial flow fans or centrifugal fans for guiding air flow.

[0054] The air conditioning indoor unit 200 also includes an indoor fan 19 for sending processed air into the room to adjust the indoor temperature and humidity. In cooling mode, the indoor fan 19 sends air cooled by the evaporator into the room to lower the indoor temperature; in heating mode, the indoor fan 19 sends air heated by the condenser into the room to raise the indoor temperature. In addition, the indoor fan 19 further drives indoor air circulation to ensure uniform distribution of cold or hot air and improve comfort. The indoor fan 19 includes a motor and fan blades, the motor drives the fan blades to rotate, and the fan blades are axial flow fans or centrifugal fans for guiding air flow.

[0055] The air conditioning system also includes an oil separator 3. The oil separator 3 is used to separate and recover lubricating oil in the exhaust gas of the compressor 1. The compressor 1 needs lubricating oil during operation to reduce friction, reduce noise and prolong service life. However, the lubricating oil can be discharged by the compressor 1 along with the refrigerant into other parts of the air conditioning system. The oil separator 3 can separate the lubricating oil from the refrigerant and recover it to the compressor 1 to ensure the normal operation of the air conditioning system. The oil separator 3 is provided on the exhaust gas line of the compressor 1. When the high-temperature and high-pressure gas discharged by the compressor 1 enters the oil separator 3, the oil separator 3 separates the lubricating oil from the refrigerant based on its own separation principle (such as centrifugal force, gravity or other physical methods), and the separated lubricating oil returns to the suction side of the compressor 1 through the oil return line inside the oil separator 3 and the oil return capillary tube 16 to ensure that the compressor 1 has enough lubricating oil to work normally. The refrigerant gas after separating the lubricating oil continues to circulate in the air conditioning system, entering the condenser, the throttling element and the evaporator, etc.

[0056] The air conditioning system further comprises a four-way valve 4. The four-way valve 4 is used to control the flow direction of the refrigerant to achieve the switching between the heating mode and the cooling mode. The four-way valve 4 is arranged between the discharge side and the suction side of the compressor 1. Four interfaces of the four-way valve 4 are connected to the discharge pipeline of the compressor 1, the suction pipeline of the compressor 1, the outdoor heat exchanger 6 and the indoor heat exchanger 18 respectively. In the cooling mode, the high-temperature and high-pressure refrigerant gas discharged by the compressor 1 enters the outdoor heat exchanger 6 through the four-way valve 4; in the heating mode, the high-temperature and high-pressure refrigerant gas discharged by the compressor 1 enters the indoor heat exchanger 18 through the four-way valve 4.

[0057] The air conditioning system further comprises a subcooling heat exchanger 11. The subcooling heat exchanger 11 is used to achieve the subcooling of the refrigerant, which refers to further reducing the temperature of the refrigerant to below the saturation temperature. The subcooling heat exchanger 11 is arranged downstream of the condenser to reduce the temperature of the condensed liquid refrigerant to below the condensation temperature. Through subcooling, the temperature of the refrigerant is reduced, the heat absorption capacity of the evaporator is enhanced, and thus the cooling efficiency and capacity of the air conditioning system are improved. The subcooling heat exchanger 11 is a plate heat exchanger, which uses a plurality of thin plates arranged alternately to form a plurality of small flow channels, so that two different temperature refrigerants exchange heat through these flow channels. For example, at the outlet of the plate heat exchanger, part of the refrigerant is throttled and cooled by the subcooling throttling element 12, and then enters the plate heat exchanger again to exchange heat with the refrigerant in the main path of the plate heat exchanger, so as to subcool the refrigerant in the main path of the plate heat exchanger and further improve the subcooling degree of the refrigerant in the main path of the plate heat exchanger. The refrigerant in the auxiliary path of the plate heat exchanger flows out of the plate heat exchanger and returns to the suction side of the compressor 1. The subcooling throttling element 12 is an electronic expansion valve.

[0058] The air conditioning system further comprises a gas-liquid separator 2. The gas-liquid separator 2 is used to separate the gas and liquid in the refrigerant. The gas-liquid separator 2 is arranged at the suction side of the compressor 1 to prevent liquid refrigerant from entering the compressor 1, thereby protecting the compressor 1 from liquid damage. The gas-liquid separator 2 is based on gravity or centrifugal force. When the refrigerant enters the gas-liquid separator 2, the gas and liquid will naturally separate due to the difference in density. The gas refrigerant will rise to the upper part of the gas-liquid separator 2 due to its lower density, while the liquid refrigerant will sink to the bottom of the gas-liquid separator 2 due to its higher density. The separated gas refrigerant enters the suction side of the compressor 1 through the upper outlet of the gas-liquid separator 2, and the separated liquid refrigerant is stored at the bottom of the gas-liquid separator 2 and returned to the refrigeration cycle through an oil return pipeline or processed by other means. The oil separator 3 and the refrigerant in the auxiliary path of the plate heat exchanger all return to the gas-liquid separator 2 at the suction side of the compressor 1.

[0059] As Figure 3As shown, the air conditioning system further comprises a pressure relief branch 104. The pressure relief branch 104 is configured to allow part of the refrigerant on the discharge side of the compressor 1 to flow to the suction side of the compressor 1 to regulate the pressure of the refrigeration cycle and protect the system components. When the pressure of the refrigeration cycle is too high, protection is provided by pressure relief to prevent damage to the compressor 1 and other components. The pressure relief branch 104 is provided with a pressure relief valve 14, which is configured to open the fluid passage of the pressure relief branch 104 to allow part of the refrigerant on the discharge side of the compressor 1 to flow to the suction side of the compressor 1 through the fluid passage of the pressure relief branch 104. When the pressure in the refrigeration cycle (e.g. the high-pressure side) reaches a predetermined safety threshold or other predetermined pressure relief conditions are met, the pressure relief valve 14 will automatically open, as shown Figure 4 As shown, part of the high-pressure refrigerant is allowed to flow to the low-pressure side through the pressure relief branch 104, thereby reducing the pressure of the refrigeration cycle; when the pressure in the refrigeration cycle is reduced to within a safe range, the pressure relief valve 14 automatically closes and the refrigeration system resumes normal operation. The pressure relief branch 104 is provided with a pressure relief capillary tube 15, which is arranged in series with the pressure relief valve 14. The small diameter and length of the capillary tube can effectively limit the flow of refrigerant, thereby ensuring that the flow of refrigerant is controllable during pressure relief and preventing excessive refrigerant from being suddenly released, which can cause excessive fluctuations in the pressure of the refrigeration cycle.

[0060] The pressure relief valve 14 is an electromagnetic valve. When the solenoid of the pressure relief valve 14 is energized, a magnetic field is generated, attracting the valve core to move and open the fluid passage of the pressure relief branch 104; when the solenoid of the pressure relief valve 14 is de-energized, the magnetic field disappears and the spring pushes the valve core back to its original position, closing the fluid passage of the pressure relief branch 104; alternatively, when the solenoid of the pressure relief valve 14 is energized, a magnetic field is generated, attracting the valve core to move and close the fluid passage of the pressure relief branch 104; when the solenoid of the pressure relief valve 14 is de-energized, the magnetic field disappears and the spring pushes the valve core back to its original position, opening the fluid passage of the pressure relief branch 104.

[0061] As shown Figure 6 The air conditioning system further comprises a heat dissipation module 23. The heat dissipation module 23 uses refrigerant in the refrigeration cycle to cool the electronic control box. The heat dissipation module 23 comprises a heat dissipation branch 101 and a heat dissipation regulating element 21, the heat dissipation branch 101 is arranged between the outdoor heat exchanger 6 and the indoor heat exchanger 18; the heat dissipation branch 101 is partially located near the electronic control box for heat exchange with the electronic control box, and the heat dissipation branch 101 is provided with the heat dissipation regulating element 21. The heat dissipation branch 101 draws refrigerant from the indoor heat exchanger 18 or the outdoor heat exchanger 6, and the heat dissipation regulating element 21 is used to regulate the flow of refrigerant in the heat dissipation branch 101. The heat dissipation regulating element 21 absorbs heat from the refrigerant, which is then returned to the refrigeration cycle. The heat dissipation regulating element 21 is an electronic expansion valve.

[0062] As shown Figure 5As shown, in some embodiments of the present application, the heat dissipation branch 101 includes a heat dissipation part 102, which includes a bent pipe or a coil pipe, and can further include fins to achieve desired heat exchange efficiency and heat exchange area; the heat dissipation part 102 is arranged in or adjacent to the electric control box. The electric control box is arranged in the outdoor unit 100, in which a plurality of electronic components are arranged.

[0063] When the refrigerant in the heat dissipation module 23 flows through the electric control box, the heat of the electric control box and the surrounding area is taken away, so that the temperature of the electric control box is reduced. However, if the temperature of the refrigerant in the heat dissipation branch 101 is too low, the temperature of the surrounding area of the electric control box will also be too low. If the surface temperature of the electric control box is lower than the dew point temperature of the surrounding air, the water vapor in the air will condense into liquid water on the surface of the electric control box, forming condensation. The water droplets of condensation can cause the circuit board or electronic components of the electric control box to short circuit, thereby causing equipment failure or damage; the water droplets of condensation can also contain impurities, which can cause corrosion of the electronic components and the circuit board, damage the insulation layer on the surface of the electronic components, and cause electrical performance to decline or fail.

[0064] As shown in FIG. 7, to solve this problem, the air conditioning system further includes a compensation branch 103. The compensation branch 103 is arranged between the discharge end of the compressor 1 and the heat dissipation branch 101, and the compensation branch 103 allows part of the refrigerant on the discharge side of the compressor 1 to be introduced into the heat dissipation branch 101, thereby avoiding the temperature of the refrigerant in the heat dissipation branch 101 from being too low, which causes condensation to form on the surface or inside of the electric control box.

[0065] In some embodiments of the present application, the inlet of the compensation branch 103 is connected to the outlet of the oil separator 3, the outlet of the compensation branch 103 is arranged on the heat dissipation branch 101, and the outlet of the compensation branch 103 is located between the heat dissipation part 102 and the heat dissipation adjusting element 21; after passing through the heat dissipation adjusting element 21, the temperature of the refrigerant can be too low. Arranging the compensation branch 103 between the heat dissipation part 102 and the heat dissipation adjusting element 21 can quickly increase the temperature of the refrigerant in the heat dissipation part 102, thereby avoiding the temperature of the refrigerant in the heat dissipation part 102 from being too low, which causes condensation to form on the electric control box.

[0066] In some embodiments of this application, a compensation valve 17 is also provided on the compensation branch 103. The compensation valve 17 is a solenoid valve. When the solenoid coil of the compensation valve 17 is energized, it generates a magnetic field, attracting the valve core to move and opening the fluid passage of the compensation branch 103, so as to allow part of the refrigerant on the discharge side of the compressor 1 to flow into the heat dissipation branch 101 through the fluid passage of the compensation branch 103; when the solenoid coil of the compensation valve 17 is de-energized, the magnetic field disappears, and the spring pushes the valve core back to its original position, closing the fluid passage of the compensation branch 103; or, when the solenoid coil of the compensation valve 17 is energized, it generates a magnetic field, attracting the valve core to move and closing the fluid passage of the compensation branch 103; when the solenoid coil of the compensation valve 17 is de-energized, the magnetic field disappears, and the spring pushes the valve core back to its original position, opening the fluid passage of the compensation branch 103, so as to allow part of the refrigerant on the discharge side of the compressor 1 to flow into the heat dissipation branch 101 through the fluid passage of the compensation branch 103.

[0067] In some embodiments of this application, the compensation branch 103 is also connected to the pressure relief branch 104. The inlet of the pressure relief branch 104 is connected to the compensation branch 103, and the outlet of the pressure relief branch 104 is connected to the gas-liquid separator 2, so as to minimize the impact on the main flow path and ensure that the air conditioning system operates without drastic fluctuations.

[0068] like Figure 8 As shown, in cooling mode, the refrigerant discharged from compressor 1 enters oil separator 3. Downstream of oil separator 3, the refrigerant is divided into two branches. The refrigerant in the main branch is guided by four-way valve 4 and enters outdoor heat exchanger 6 through diversion pipe 5. The high-temperature and high-pressure gaseous refrigerant condenses into high-pressure liquid refrigerant in outdoor heat exchanger 6.

[0069] After passing through the splitting capillary tube 7 and the splitter 9, the refrigerant in the main circuit is divided into two paths. One path passes through the heat dissipation regulating element 21 and enters the heat dissipation section 102 to reduce the temperature of the components in the electrical control box. The other path passes through the outdoor electronic expansion valve 10 and merges with the refrigerant flowing out of the heat dissipation section 102.

[0070] The combined refrigerants enter the subcooling heat exchanger 11 for subcooling. At the outlet of the subcooling heat exchanger 11, part of the refrigerant passes through the cold throttling element 12 and re-enters the subcooling heat exchanger 11, further subcooling the other refrigerant in the subcooling heat exchanger 11. This further increases the subcooling degree of the other refrigerant in the subcooling heat exchanger 11. Part of the refrigerant drawn out from the outlet of the subcooling heat exchanger 11 flows out of the subcooling heat exchanger 11 and enters the gas-liquid separator 2.

[0071] The remaining refrigerant at the outlet of the subcooling heat exchanger 11 enters the indoor side after passing through the liquid-side shut-off valve 13. In the indoor heat exchanger 18, the refrigerant evaporates and absorbs heat, then enters the four-way valve 4 through the gas-side shut-off valve 20, and finally flows to the gas-liquid separator 2. The refrigerant in the gas-liquid separator 2 is drawn back into the compressor 1 by the compressor 1, forming a complete refrigeration cycle.

[0072] In addition to the main line, another branch downstream of oil separator 3 is connected to compensation branch 103. When pressure relief valve 14 is opened, facilitating pressure relief branch 104, the high-pressure and low-pressure sides of the refrigeration cycle are connected, thus relieving system pressure. Figure 9 As shown, when the compensation valve 17 is opened and the compensation branch 103 is connected, the superheated refrigerant on the high-pressure side can flow into the heat dissipation branch 101, increasing the refrigerant temperature in the heat dissipation branch 101 and preventing condensation.

[0073] like Figure 10 As shown, in cooling mode, when the indoor unit 200 has a low load, the compressor 1 discharge pressure is relatively low. At this time, the compensation branch 103 is also configured to allow some of the refrigerant in the heat dissipation branch 101 to be introduced into the discharge side of the compressor 1. Specifically, the compensation valve 17 opens to allow some of the refrigerant in the heat dissipation branch 101 to flow into the discharge side of the compressor 1 through the fluid passage of the compensation branch 103. The refrigerant that flows through the outdoor heat exchanger 6 and the heat dissipation regulating element 21 in sequence can enter the four-way valve 4 through the compensation valve 17, which temporarily compensates for the discharge pressure of the compressor 1 and prevents the compressor 1 from being triggered by the low-pressure protection mechanism due to excessively low discharge pressure, thus causing the compressor 1 to stop.

[0074] like Figure 2 As shown, in heating mode, the refrigerant discharged from compressor 1 enters oil separator 3. Downstream of oil separator 3, the refrigerant is divided into two branches. The refrigerant in the main branch is guided by four-way valve 4, passes through gas-side shut-off valve 20, and enters indoor heat exchanger 18. The high-temperature and high-pressure gaseous refrigerant condenses in indoor heat exchanger 18 and becomes high-pressure liquid refrigerant.

[0075] The liquid refrigerant flowing out from the indoor heat exchanger 18 passes through the liquid-side shut-off valve 13 and enters the outdoor side. After entering the indoor side, part of the refrigerant passes through the cold throttling element 12 and enters the subcooling heat exchanger 11; another part of the refrigerant directly enters the subcooling heat exchanger 11. The refrigerant passing through the subcooling throttling element 12 subcools the other refrigerant in the subcooling heat exchanger 11, further increasing the subcooling degree of the other refrigerant in the subcooling heat exchanger 11. After some of the refrigerant flows out of the subcooling heat exchanger 11, it enters the gas-liquid separator 2.

[0076] Another part of the refrigerant in the subcooling heat exchanger 11 is further divided into two paths, one path enters the heat dissipation part 102 and flows through the heat dissipation adjustment element 21 to reduce the temperature of the components in the electronic control box; the other path passes through the outdoor electronic expansion valve 10 and is combined with the refrigerant flowing through the heat dissipation adjustment element 21, and the combined refrigerant evaporates and absorbs heat in the outdoor heat exchanger 6, and finally flows to the gas-liquid separator 2 guided by the four-way valve 4, and the refrigerant in the gas-liquid separator 2 is sucked into the compressor 1 again to form a complete refrigeration cycle.

[0077] In addition to the main path, another branch downstream of the oil separator 3 is connected to the compensation branch 103. When the pressure relief valve 14 is opened and the pressure relief branch 104 is conducted, the high-pressure side and the low-pressure side of the refrigeration cycle are conducted, which plays a role in system pressure relief. When the compensation valve 17 is opened and the compensation branch 103 is conducted, the overheat state refrigerant on the high-pressure side can flow into the heat dissipation branch 101, thereby increasing the temperature of the refrigerant in the heat dissipation branch 101 and avoiding condensation.

[0078] The air conditioning system further comprises a first detection unit 22; the first detection unit 22 is used for monitoring or monitoring and recording the temperature of the electronic control box to output a temperature detection signal. The first detection unit 22 can be a temperature sensor to detect the temperature of the electronic control box in real time; the first detection unit 22 can also be a temperature recorder or a smart temperature sensor; it can record the temperature data within a period of time and output the highest temperature of the electronic control box as the temperature detection signal.

[0079] The air conditioning system further comprises a second detection unit 24; the second detection unit 24 is used for monitoring the dew point temperature of the electronic control box to output a dew point temperature detection signal. The dew point temperature represents the humidity level around the electronic control box, and a too high humidity level is more likely to cause condensation, resulting in moisture, short circuit or corrosion of electronic components. The second detection unit 24 can be a combination of a temperature sensor and a humidity sensor, or a dedicated dew point temperature sensor.

[0080] The air conditioning system further comprises a first comparison unit, which is used for outputting a first driving signal when the temperature detection signal is higher than a preset temperature threshold signal; or outputting a second driving signal when the temperature detection signal is lower than the preset temperature threshold signal.

[0081] The air conditioning system further comprises a controller, which can be a system on chip with MCU as the core. The controller receives the first driving signal to drive the heat dissipation adjustment element to act to increase the refrigerant flow in the heat dissipation branch; or receives the second driving signal to drive the heat dissipation adjustment element to act to reduce the refrigerant flow in the heat dissipation branch.

[0082] Specifically, the first comparison unit comprises a first comparison circuit, one input end of the first comparison circuit inputs the temperature detection signal generated by the first detection unit 22, and the other input end inputs a preset temperature threshold signal (for example, a converted voltage signal).

[0083] If the temperature detection signal is higher than the temperature threshold signal, the first comparator outputs a first driving signal, for example, a high-level signal; at this time, the temperature of the electric control box is higher than the preset temperature, the controller receives the first driving signal to drive the heat dissipation adjusting element 21 to open the valve, so as to increase the refrigerant flow in the heat dissipation branch 101 (and the heat dissipation part 102 therein) and improve the heat dissipation efficiency.

[0084] If the temperature detection signal is lower than the temperature threshold signal, the first comparator outputs a second driving signal, for example, a low-level signal; at this time, the temperature of the electric control box is lower than the preset temperature, the controller receives the second driving signal to drive the heat dissipation adjusting element 21 to close the valve or maintain the current opening degree unchanged, so as to maintain the heat dissipation efficiency.

[0085] The first comparison circuit can be realized by one comparator chip. The first comparison circuit can also be realized by multiple comparator chips, and each comparator circuit has one input end inputting different temperature threshold signals (for example, A, B, C, D with different sizes). The first comparison circuit can also be realized by an MCU and its peripheral circuit. The model of the comparator chip is not limited herein.

[0086] In some embodiments of the present application, the first comparison unit further comprises a second comparison circuit, one input end of the second comparison circuit inputs the temperature detection signal generated by the first detection unit 22, and the other input end inputs the dew point temperature detection signal generated by the second detection unit 24; if the temperature detection signal is lower than the dew point temperature detection signal, the second comparison circuit outputs a third driving signal to drive the heat dissipation adjusting element 21 to close the valve, so as to reduce the refrigerant flow in the heat dissipation branch 101 (and the heat dissipation part 102 therein) and avoid condensation due to too low temperature. If the temperature detection signal is higher than the dew point temperature detection signal, the second comparison circuit outputs a fourth driving signal to drive the heat dissipation electronic expansion valve to open the valve or maintain the current opening degree unchanged, so as to maintain the heat dissipation efficiency. The second comparison circuit can be realized by one comparator chip. The first comparison circuit can also be realized by an MCU. The model of the comparator chip and the MCU is not limited herein.

[0087] The air conditioning system further comprises a second comparison unit for outputting a first compensation driving signal when the temperature detection signal is lower than the dew point temperature detection signal. The controller receives the first compensation driving signal to drive the compensation valve 17 to open the fluid passage of the compensation branch 103, so as to allow part of the refrigerant on the exhaust side of the compressor 1 to flow into the heat dissipation branch 101 through the fluid passage of the compensation branch 103.

[0088] When the opening of the heat dissipation regulating element 21 is at the minimum, there can still be a case that the temperature detection signal is lower than the dew point temperature detection signal. In some embodiments of the present application, the second comparison unit further comprises a third comparison circuit, when the heat dissipation regulating element 21 is at the minimum opening and a certain time length is met, one input end of the third comparison circuit inputs the temperature detection signal generated by the first detection unit 22, and the other input end inputs the dew point temperature detection signal generated by the second detection unit 24; if the temperature detection signal is lower than the dew point temperature detection signal, the third comparison circuit outputs a first compensation driving signal, for example, a high level signal, to drive the compensation valve 17 to open, allowing part of the refrigerant on the exhaust side of the compressor 1 to flow into the heat dissipation branch 101 through the fluid passage of the compensation branch 103, to neutralize the low temperature refrigerant with the overheat refrigerant, to avoid the risk of condensation. The detection that the heat dissipation regulating element 21 is at the minimum opening can be realized by the combination of a current detection circuit and a comparator circuit, or by a position sensor. If the temperature detection signal is higher than the dew point temperature detection signal, the third comparison circuit outputs a low level signal to drive the compensation valve 17 to close. The third comparison circuit can be realized by a comparator chip.

[0089] The third comparison circuit can also work independently, that is, when the temperature detection signal is lower than the dew point temperature detection signal, the third comparison circuit outputs the first compensation driving signal to drive the compensation valve 17 to open, allowing part of the refrigerant on the exhaust side of the compressor 1 to flow into the heat dissipation branch 101 through the fluid passage of the compensation branch 103.

[0090] The air conditioning system further comprises an exhaust pressure detection unit for detecting the pressure at the exhaust end of the compressor 1 and generating an exhaust pressure detection signal.

[0091] The air conditioning system further comprises a suction pressure detection unit for detecting the pressure at the suction end of the compressor 1 and generating a suction pressure detection signal.

[0092] The air conditioning system further comprises a third comparison unit for comparing the suction pressure detection signal and a reference suction pressure signal, and comparing the exhaust pressure detection signal and a reference exhaust pressure signal.

[0093] The air conditioning system further comprises a logic circuit for generating a second compensation driving signal based on the output of the comparison unit.

[0094] The controller further receives the second compensation driving signal in the refrigeration mode to drive the compensation valve 17 to open the fluid passage of the compensation branch 103, to allow part of the refrigerant in the heat dissipation branch 101 to flow into the exhaust side of the compressor 1 through the fluid passage of the compensation branch 103.

[0095] Specifically, the third comparison unit includes a fourth comparison circuit and a fifth comparison circuit. The logic circuit includes an AND gate circuit; one input end of the fourth comparison circuit inputs the exhaust pressure detection signal, another input end inputs the reference exhaust pressure signal, and the output end of the fourth comparison circuit outputs an effective signal, such as a high-level signal, to one input end of the AND gate circuit when the exhaust pressure detection signal is lower than the reference exhaust pressure signal; one input end of the fifth comparison circuit inputs the suction pressure detection signal, another input end inputs the reference suction pressure signal, and the output end of the fifth comparison circuit outputs an effective signal, such as a high-level signal, to another input end of the AND gate circuit when the suction pressure detection signal is higher than the reference suction pressure signal; the output end of the AND gate circuit is connected to the controller, and the AND gate circuit outputs the second compensation driving signal when receiving two effective signals; the controller drives the compensation valve 17 to open when the AND gate circuit outputs the second compensation driving signal, allowing part of the refrigerant in the heat dissipation branch 101 to flow into the exhaust side of the compressor 1 through the fluid passage of the compensation branch 103, and compensating the exhaust pressure by using the refrigerant in the heat dissipation branch 101; so as to realize exhaust pressure compensation when the exhaust pressure is too low and the suction pressure is normal in the refrigeration mode.

[0096] The fourth comparison circuit and the fifth comparison circuit can be realized by a comparator chip.

[0097] Of course, the first comparison circuit, the second comparison circuit, the third comparison circuit, the fourth comparison circuit, the fifth comparison circuit and the AND gate circuit can be realized by an MCU and its peripheral circuit, and the comparison and logic operation realized by the MCU and its peripheral circuit are well-known technical means to those skilled in the art, and are not the focus of protection of the present application. The model of the MCU is not limited herein.

[0098] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0099] The above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air conditioning system, comprising: an outdoor unit, comprising: an outdoor heat exchanger serving as a condenser or an evaporator; an electric control box in which a plurality of electronic components are arranged; a compressor connected to the outdoor heat exchanger through a four-way valve; an indoor unit, comprising: an indoor heat exchanger serving as an evaporator or a condenser; characterized in that it further comprises: a heat dissipation module, comprising: a heat dissipation branch arranged between the outdoor heat exchanger and the indoor heat exchanger, the heat dissipation branch being in heat exchange with the electric control box; and a heat dissipation regulating element arranged on the heat dissipation branch, for regulating the flow of refrigerant in the heat dissipation branch; and a compensation branch arranged between the discharge side of the compressor and the heat dissipation branch, the compensation branch allowing part of the refrigerant on the discharge side of the compressor to be introduced into the heat dissipation branch.

2. The air conditioning system according to claim 1, characterized in that: the compensation branch is further configured to allow part of the refrigerant in the heat dissipation branch to be introduced into the discharge side of the compressor.

3. The air conditioning system according to claim 2, characterized in that: a compensation valve is arranged on the compensation branch, the compensation valve being configured to open a fluid passage of the compensation branch to allow part of the refrigerant on the discharge side of the compressor to flow into the heat dissipation branch through the fluid passage of the compensation branch, or to allow part of the refrigerant in the heat dissipation branch to flow into the discharge side of the compressor through the fluid passage of the compensation branch.

4. The air conditioning system according to any one of claims 1 to 3, characterized in that: the outdoor unit further comprises: a pressure relief branch arranged between the discharge side and the suction side of the compressor, the pressure relief branch being configured to allow part of the refrigerant on the discharge side of the compressor to flow to the suction side of the compressor.

5. The air conditioning system according to claim 4, characterized in that: a pressure relief valve is arranged on the pressure relief branch, the pressure relief valve being configured to open a fluid passage of the pressure relief branch to allow part of the refrigerant on the discharge side of the compressor to flow to the suction side of the compressor through the fluid passage of the pressure relief branch.

6. The air conditioning system according to claim 5, characterized in that: the outdoor unit further comprises: a gas-liquid separator arranged on the suction side of the compressor; an inlet of the pressure relief branch is connected to the compensation branch, and an outlet of the pressure relief branch is connected to the gas-liquid separator.

7. The air conditioning system according to claim 6, characterized in that: the outdoor unit further comprises: a subcooling heat exchanger arranged between the outdoor heat exchanger and the indoor heat exchanger; the heat dissipation branch is connected to one fluid passage of the subcooling heat exchanger, and another fluid passage of the subcooling heat exchanger is connected to the gas-liquid separator through a cold throttling element.

8. The air conditioning system according to claim 3, characterized in that: the outdoor unit further comprises: a first detection unit for monitoring the temperature of the electric control box to output a temperature detection signal; a second detection unit for monitoring the temperature of the subcooling heat exchanger to output a temperature detection signal; and a third detection unit for monitoring the temperature of the gas-liquid separator to output a temperature detection signal. a comparison circuit configured to output a first driving signal when the temperature detection signal is higher than a preset temperature threshold signal, or output a second driving signal when the temperature detection signal is lower than the preset temperature threshold signal; and a controller configured to receive the first driving signal and drive the heat dissipation adjustment element to increase the refrigerant flow in the heat dissipation branch, or receive the second driving signal and drive the heat dissipation adjustment element to decrease the refrigerant flow in the heat dissipation branch.

9. The air conditioning system of claim 3, wherein: the outdoor unit further comprises: a first detection unit configured to monitor the temperature of the electric control box to output a temperature detection signal; a second detection unit configured to monitor the dew point temperature of the electric control box to output a dew point temperature detection signal; and a comparison circuit configured to output a first compensation driving signal when the temperature detection signal is lower than the dew point temperature detection signal; and a controller configured to receive the first compensation driving signal and drive the compensation valve to open the fluid passage of the compensation branch to allow part of the refrigerant on the discharge side of the compressor to flow into the heat dissipation branch through the fluid passage of the compensation branch.

10. The air conditioning system of claim 3, wherein: the outdoor unit further comprises: a suction pressure detection unit configured to detect the pressure on the suction side of the compressor to generate a suction pressure detection signal; a discharge pressure detection unit configured to detect the pressure on the discharge side of the compressor to generate a discharge pressure detection signal; a comparison circuit configured to compare the suction pressure detection signal with a reference suction pressure signal and the discharge pressure detection signal with a reference discharge pressure signal, respectively; a logic circuit configured to generate a second compensation driving signal based on the output of the comparison circuit; and a controller configured to receive the second compensation driving signal and drive the compensation valve to open the fluid passage of the compensation branch to allow part of the refrigerant in the heat dissipation branch to flow into the discharge side of the compressor through the fluid passage of the compensation branch in the cooling mode.

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