Air conditioner

Abstract

The invention discloses an air conditioner which comprises an outdoor unit and an indoor unit. The outdoor unit comprises an outdoor electronic expansion valve, at least one compressor and at least one driving module correspondingly connected with the compressor; the outdoor electronic expansion valve is connected with the indoor unit through a refrigerant main pipe; the driving module is arranged in the electric control box; the outdoor unit further comprises a first temperature detection unit, at least one refrigerant heat dissipation module and a controller. The first temperature detection unit is used for detecting the dew point temperature in the electric control box; the refrigerant heat dissipation module is connected with the electric control box, dissipates heat for the corresponding driving module, and comprises a heat dissipation electronic expansion valve, a refrigerant branch pipe, a second temperature detection unit and a third temperature detection unit; the refrigerant branch pipe comprises an inflow end and an outflow end; the inflow end is connected with the refrigerant main pipe; the heat dissipation electronic expansion valve is arranged on the refrigerant branch pipe; the second temperature detection unit is used for detecting the refrigerant temperature; the third temperature detection unit is used for detecting the temperature of the driving module; the controller is electrically connected with the compressor, the heat dissipation electronic expansion valves, the first temperature detection unit, the second temperature detection unit and the third temperature detection unit and is configured to control the corresponding heat dissipation electronic expansion valves to be opened when the compressor operates, and the dew point temperature, the refrigerant temperature and the driving module temperature are obtained. And the opening degree of the heat dissipation electronic expansion valve is controlled by stages according to the difference value between the refrigerant temperature and the dew point temperature and the temperature of the driving module.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioning technology, in particular to an air conditioner. BACKGROUND

[0002] With the gradual improvement of air conditioning technology, in the air conditioning industry, especially the frequency conversion outdoor unit, the structure of the electric control box needs to meet the conditions of good ventilation and heat dissipation and dustproof and waterproof, which can effectively prevent the entry of water droplets from damaging the electric control box. The contradiction between ventilation and heat dissipation and dustproof and waterproof often leads to certain difficulty in the heat dissipation design of the electric control system of the frequency conversion outdoor unit. Moreover, the application range of the frequency conversion air conditioner is becoming more and more extensive. In order to cope with the increasing energy efficiency requirements, the working frequency of the frequency conversion compressor will also be gradually improved, and the heat generated by the frequency conversion control module in the electric control system of the frequency conversion air conditioner will also be higher, and the temperature of the electric control box cavity will also be higher.

[0003] At present, the electronic component heat dissipation methods of the frequency conversion air conditioner outdoor unit applied in the market mainly include forced air cooling heat dissipation and refrigerant heat dissipation. The forced air cooling heat dissipation method has simple structure, high reliability and low cost, but due to its limited heat dissipation effect, especially in high temperature environment, the heat dissipation effect is not good, which leads to poor air conditioner operation reliability, and it is difficult to adapt to the heat dissipation demand of high temperature environment; the refrigerant heat dissipation effect is good, but the structure is complex, and the reliability is low due to condensation problem, and the air conditioner energy efficiency will be affected.

[0004] The above information disclosed in the background of the application is only used to increase the understanding of the background of the application, therefore, it can include prior art known by those skilled in the art. SUMMARY

[0005] In view of the problems of low heat dissipation efficiency, poor reliability and influence on energy efficiency of the frequency conversion electric control in the background art, the present application provides an air conditioner, which sets a refrigerant branch pipe connected in parallel with a refrigerant main pipe and a scheme of controlling the refrigerant flow in stages through a heat dissipation electronic expansion valve, so as to improve the heat dissipation efficiency and reliability of the frequency conversion electric control part, and reduce the influence on the energy efficiency of the air conditioner.

[0006] In order to achieve the above application purposes, the present application adopts the following technical solutions: An air conditioner, comprising an outdoor unit and an indoor unit; the outdoor unit comprises an outdoor electronic expansion valve, at least one compressor and at least one drive module corresponding to the compressor; the outdoor electronic expansion valve is connected with the indoor unit through a refrigerant main pipe; the drive module is arranged in an electric control box; The outdoor unit further comprises a first temperature detection unit, at least one refrigerant heat dissipation module and a controller; The first temperature detection unit is arranged in the electric control box and is used for detecting the dew point temperature in the electric control box; The refrigerant heat dissipation module is arranged corresponding to the driving module to dissipate heat for the driving module, and comprises a heat dissipation electronic expansion valve, a refrigerant branch pipe, a second temperature detection unit and a third temperature detection unit; the refrigerant branch pipe comprises an inflow end and an outflow end; the inflow end is connected with the refrigerant main pipe; the heat dissipation electronic expansion valve is arranged on the refrigerant branch pipe; the second temperature detection unit is connected with the refrigerant branch pipe and is used for detecting the refrigerant temperature; and the third temperature detection unit is connected with the driving module and is used for detecting the driving module temperature. The controller is electrically connected with the compressor, the heat dissipation electronic expansion valve, the first temperature detection unit, the second temperature detection unit and the third temperature detection unit, and is configured to control the corresponding heat dissipation electronic expansion valve to be opened when the compressor is running, to cyclically acquire the dew point temperature, the refrigerant temperature and the driving module temperature, and to control the opening degree of the heat dissipation electronic expansion valve in stages according to the difference between the refrigerant temperature and the dew point temperature and the driving module temperature.

[0007] The air conditioner of the present application adopts the anti-condensation mode control of controlling the opening degree of the heat dissipation electronic expansion valve according to the difference between the refrigerant temperature and the dew point temperature in the initial stage of heat dissipation, and adopts the normal control of controlling the opening degree of the heat dissipation electronic expansion valve according to the driving module temperature in the stable stage of heat dissipation, effectively prevents condensation from occurring, and quickly and efficiently adjusts the opening degree of the heat dissipation electronic expansion valve to a stable range with low risk of condensation, then performs normal mode control, reduces the risk of condensation, improves the stability and reliability of operation, reduces energy consumption and improves energy efficiency.

[0008] In some specific embodiments, the controller is configured with an initial opening degree, a first temperature threshold, a minimum opening degree, a first time threshold, an anti-condensation mode and a condensation condition, the condensation condition is that the difference between the refrigerant temperature and the dew point temperature does not exceed the first temperature threshold, and the controller is configured to open the heat dissipation electronic expansion valve at the initial opening degree and enter the anti-condensation mode when the compressor is initially running. The anti-condensation mode comprises: acquiring the refrigerant temperature and the dew point temperature, judging whether the condensation condition is met and the opening degree of the heat dissipation electronic expansion valve is not less than the minimum opening degree, and if so, controlling the opening degree of the heat dissipation electronic expansion valve to be reduced. If the condensation condition is met and the opening degree of the heat dissipation electronic expansion valve does not exceed the minimum opening degree, the running time length of the compressor is timed, and if the running time length reaches the first time threshold and the condensation condition is met during the period, the compressor is controlled to be stopped.

[0009] The air conditioner of the present embodiment adjusts the opening degree of the heat dissipation electronic expansion valve or controls the compressor to be stopped to prevent condensation from occurring when it is judged that the condensation condition is met, i.e., the condition of condensation is met, thereby improving the reliability of the driving module.

[0010] In some specific embodiments, the controller is configured with a second temperature threshold greater than the first temperature threshold, a first maximum opening degree, a second time threshold, a no-condensation condition that whether the difference between the refrigerant temperature and the dew point temperature exceeds the second temperature threshold; the anti-condensation mode further comprises: If the no-condensation condition is met, comparing the opening degree of the heat dissipation electronic expansion valve with the first maximum opening degree; If the opening degree of the heat dissipation electronic expansion valve does not exceed the first maximum opening degree, controlling the heat dissipation electronic expansion valve to increase the opening degree; If the opening degree of the heat dissipation electronic expansion valve reaches the first maximum opening degree, timing the running time length of the compressor; if the running time length reaches the second time threshold and the no-condensation condition is met during the time, obtaining the opening degree of the heat dissipation electronic expansion valve at this time and defining it as a second maximum opening degree, and exiting the anti-condensation mode.

[0011] The air conditioner of the embodiment executes no-condensation control when judging that the no-condensation condition is met, so that the opening degree of the heat dissipation electronic expansion valve is as large as possible, and the heat dissipation effect is guaranteed.

[0012] In some specific embodiments, the controller is configured with a third time threshold, a safe condensation condition that the difference between the refrigerant temperature and the dew point temperature exceeds the first temperature threshold and does not exceed the second temperature threshold, and the anti-condensation mode further comprises: If the safe condensation condition is met, timing the running time length of the compressor; if the running time length reaches the third time threshold and the safe condensation condition is met during the time, obtaining the opening degree of the heat dissipation electronic expansion valve at this time and defining it as a second maximum opening degree, and exiting the anti-condensation mode.

[0013] The air conditioner of the embodiment executes safe condensation control when judging that the safe condensation condition is met, so that the heat dissipation effect and the opening degree of the heat dissipation electronic expansion valve are kept stable, and the reliability of the driving module and the energy efficiency of the unit are improved.

[0014] In some specific embodiments, the controller is further configured with a normal mode which controls the opening degree of the heat dissipation electronic expansion valve according to the driving module temperature; the second time threshold is equal to the third time threshold; The controller is further configured to enter the normal mode when exiting the anti-condensation mode.

[0015] In some specific embodiments, the controller is configured with a third temperature threshold, and is configured to the normal mode comprising: Obtaining the driving module temperature; comparing the drive module temperature to the third temperature threshold; if the drive module temperature does not exceed the third temperature threshold, maintaining the current opening degree of the heat dissipation electronic expansion valve.

[0016] The air conditioner of the embodiment maintains the opening degree of the heat dissipation electronic expansion valve when the drive module temperature meets the requirement of not exceeding the third temperature threshold through the normal mode control, reduces the adjustment frequency of the heat dissipation electronic expansion valve, improves the heat dissipation effect and the stability of the non-condensation state, and improves the control efficiency and reduces the power consumption.

[0017] In some specific embodiments, the controller is configured with a fourth temperature threshold which is greater than the third temperature threshold; the normal mode further comprises: if the drive module temperature reaches or exceeds the third temperature threshold, comparing the opening degree of the heat dissipation electronic expansion valve to the second maximum opening degree; if the opening degree of the heat dissipation electronic expansion valve reaches or exceeds the second maximum opening degree, judging whether the drive module temperature reaches or exceeds the fourth temperature threshold; if yes, reducing the frequency of the compressor; if no, maintaining the current opening degree of the heat dissipation electronic expansion valve.

[0018] The air conditioner of the embodiment maintains the opening degree of the heat dissipation electronic expansion valve or reduces the frequency of the compressor through the judgment control of the drive module and the fourth temperature threshold, realizes the safety condensation state below the second maximum opening degree and the solution when the heat dissipation effect cannot be guaranteed in the safety condensation state, and guarantees the condensation safety and the heat dissipation effect.

[0019] In some specific embodiments, the normal mode further comprises: if the opening degree of the heat dissipation electronic expansion valve does not reach the second maximum opening degree, controlling the heat dissipation electronic expansion valve to increase the opening degree, and continuing to acquire the drive module temperature and compare it with the third temperature threshold.

[0020] The air conditioner of the embodiment guarantees the heat dissipation effect under the premise of guaranteeing the condensation safety in the normal mode control.

[0021] In some specific embodiments, the outdoor unit further comprises a plate heat exchanger and a gas-liquid separator; the plate heat exchanger comprises a supercooling main circuit which is connected in series on the refrigerant main circuit, and the refrigerant branch pipe is connected in parallel with the refrigerant main pipe and located between the outdoor electronic expansion valve and the supercooling main circuit.

[0022] The air conditioner of the embodiment is a way of setting a refrigerant heat dissipation module, and the refrigerant after heat dissipation of the drive module returns to the main circuit to participate in the main circulation, and the supercooling degree is guaranteed through the plate heat exchanger to improve the unit energy efficiency.

[0023] In some specific embodiments, the outdoor unit further includes a plate heat exchanger and a gas-liquid separator; the plate heat exchanger includes an auxiliary branch, one end of which is connected to the gas-liquid separator; The outflow end is connected to one end of the auxiliary branch.

[0024] The air conditioner in this embodiment uses an alternative refrigerant heat dissipation module. After the refrigerant has been cooled by the drive module, it returns to the compressor through a gas-liquid separator to ensure subcooling and improve the unit's energy efficiency.

[0025] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the system structure according to an embodiment; Figure 2 This is a schematic diagram of the system structure according to an embodiment; Figure 3 This is a schematic diagram of the connection of the electronic control components according to an embodiment; Figure 4 This is a schematic diagram of the control flow according to an embodiment; Figure 5 This is a schematic diagram of the control flow according to an embodiment; Figure 6 This is a schematic diagram of the control flow according to an embodiment; Figure 7 This is a schematic diagram of the control flow according to an embodiment; Figure 8 This is a schematic diagram of the control flow according to an embodiment; Figure 9 This is a schematic diagram of the control flow according to an embodiment; Figure 10 This is a schematic diagram of the control flow according to an embodiment.

[0028] Figure label, 01, indoor unit; 02, outdoor unit; 1, compressor; 2, outdoor electronic expansion valve; 3, first temperature detection unit; 41, heat dissipation electronic expansion valve; 42, second temperature detection unit; 43, third temperature detection unit; 44, radiator; 45, refrigerant branch pipe; 46, inflow end; 47, outflow end; 5, plate heat exchanger; 51, auxiliary branch; 52, auxiliary electronic expansion valve; 53, supercooling main path; 6, gas-liquid separator; 7, liquid side stop valve; 8, controller; 9, outdoor heat exchanger. DETAILED DESCRIPTION

[0029] 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 of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0030] 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 shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply 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 a limitation of the present application.

[0031] The terms "first", "second" are only used for descriptive purposes, 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, the meaning of "a plurality of" is two or more.

[0032] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, 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, or internal communication of 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.

[0033] In the present invention, unless explicitly specified and limited, "on" or "under" of a first feature to a second feature 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, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0034] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present invention. For the purpose of simplification, the components and arrangements of the specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeatedly refer to numerals and / or reference 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 arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials.

[0035] An air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and performs cooling or heating of an indoor space.

[0036] A 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.

[0037] The expansion valve expands the high-temperature and high-pressure state liquid phase refrigerant formed in the condenser into a low-pressure liquid phase refrigerant. The evaporator evaporates the refrigerant expanded in the 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 a material to be cooled using the latent heat of evaporation of the refrigerant. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

[0038] The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger, the indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in the indoor unit or the outdoor unit.

[0039] The indoor heat exchanger and the outdoor heat exchanger are used as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.

[0040] Referring to Figure 1 , Figure 2 , Figure 3 The outdoor unit 02 comprises an outdoor electronic expansion valve 2, at least one compressor 1 and at least one drive module corresponding to the compressor 1; the compressor 1 is a variable frequency compressor 1, which is driven by the drive module; the drive module is a power module, which is arranged in an electric control box and needs to be configured with a heat dissipation device to dissipate heat for the drive module and ensure that the drive module operates at a suitable temperature.

[0041] The outdoor electronic expansion valve 2 is connected to the indoor unit 01 through a refrigerant main pipe, and is used to throttle and depressurize the liquid refrigerant condensed by the outdoor heat exchanger 9 or the indoor heat exchanger of the indoor unit 01.

[0042] The outdoor unit 02 further comprises a first temperature detection unit 3 arranged in the electric control box, which is used to detect the dew point temperature in the electric control box.

[0043] The outdoor unit 02 further comprises at least one refrigerant heat dissipation module connected to the electric control box to dissipate heat for the corresponding drive module. That is, the number of compressors 1, the number of drive modules and the number of refrigerant heat dissipation modules are the same, and each compressor 1 is connected to each drive module one by one; each refrigerant heat dissipation module is arranged corresponding to each drive module, so that each refrigerant heat dissipation module dissipates heat for each drive module one by one.

[0044] The refrigerant heat dissipation module comprises a heat dissipation electronic expansion valve 41 and a refrigerant branch pipe 45; the refrigerant branch pipe 45 is a single-flow pipe comprising an inflow end 46 and an outflow end 47; the inflow end 46 is connected to the refrigerant main pipe, so that the refrigerant condensed by the outdoor heat exchanger 9 and throttled by the outdoor electronic expansion valve 2 flows into the refrigerant branch pipe 45, and the refrigerant flow into the refrigerant branch pipe 45 is adjusted by adjusting the opening of the heat dissipation electronic expansion valve 41; the liquid refrigerant in the refrigerant branch pipe 45 evaporates to cool and dissipate heat for the drive module.

[0045] The refrigerant heat dissipation module further comprises a second temperature detection unit 42 and a third temperature detection unit 43, which are respectively connected to the refrigerant branch pipe 45 and the drive module, and are used to detect the temperature of the refrigerant in the refrigerant branch pipe 45 and the temperature of the drive module.

[0046] The outdoor unit 02 further comprises a controller 8 electrically connected with the compressor 1, the heat-dissipation electronic expansion valve 41, the first temperature detecting unit 3, the second temperature detecting unit 42 and the third temperature detecting unit 43, respectively, to control the start, operation and stop of the compressor 1, and to receive the dew point temperature detected by the first temperature detecting unit 3, the refrigerant temperature detected by the second temperature detecting unit 42 corresponding to the driving module and the driving module temperature detected by the third temperature detecting unit 43 when the compressor 1 is started and operated, and to control the opening degree of the heat-dissipation electronic expansion valve 41 corresponding to the refrigerant heat-dissipation module in stages according to the difference between the refrigerant temperature and the dew point temperature and the driving module temperature.

[0047] That is, the opening degree of the heat-dissipation electronic expansion valve 41 is controlled according to the difference between the refrigerant temperature and the dew point temperature in different operation stages of the compressor 1, or the opening degree of the heat-dissipation electronic expansion valve 41 is controlled according to the driving module temperature. That is, the opening degree of the heat-dissipation electronic expansion valve 41 is controlled by the difference between the refrigerant temperature and the dew point temperature in the high risk stage of condensation, and the opening degree of the heat-dissipation electronic expansion valve 41 is controlled according to the driving module temperature in the low risk stage of condensation or the stable stage of condensation.

[0048] The air conditioner of the present application adopts the anti-condensation control of controlling the opening degree of the heat-dissipation electronic expansion valve 41 according to the difference between the refrigerant temperature and the dew point temperature when the driving module temperature changes greatly, i.e. in the high risk stage of condensation, which is generally the initial start stage of the compressor 1, to effectively prevent the generation of condensation and quickly and efficiently adjust the opening degree of the heat-dissipation electronic expansion valve 41 to the low risk stable range of condensation. The air conditioner adopts the normal control of controlling the opening degree of the heat-dissipation electronic expansion valve 41 according to the driving module temperature when the driving module temperature tends to be stable, i.e. in the stable stage of condensation, and the low risk stable range of condensation is controlled in the normal mode to ensure the heat-dissipation effect and improve the reliability of operation. The control is reduced, the control efficiency is improved, and the power consumption is reduced. The refrigerant heat-dissipation module is controlled respectively for the driving module and the compressor 1 to reduce the risk of condensation and improve the energy efficiency.

[0049] The specific structure, control process and principle of the air conditioner of the present application will be described in detail below through specific embodiments.

[0050] In some specific embodiments, with reference to Figure 1 , Figure 2 , Figure 3 , the outdoor unit 02 further comprises a liquid-side stop valve 7; the outdoor electronic expansion valve 2 is connected with the liquid-side stop valve 7 through a refrigerant main pipe; and the liquid-side stop valve 7 is connected with the indoor unit 01 through a refrigerant pipe.

[0051] In some specific embodiments, with reference to Figure 1 , Figure 3The outflow end 47 is also connected with the refrigerant main pipe; that is, each refrigerant branch pipe 45 is connected with the refrigerant main pipe in parallel; that is, the liquid refrigerant enters the refrigerant branch pipe 45 from the inflow end 46 of the refrigerant main pipe, evaporates in the refrigerant branch pipe 45, and returns to the refrigerant main pipe after being cooled by the refrigerant cooling module.

[0052] The refrigerant in the refrigerant branch pipe 45 of the air conditioner of the embodiment returns to the refrigerant main pipe through the outflow end 47 to participate in the main loop circulation, simplifying the pipeline design.

[0053] In some specific embodiments, referring to Figure 1 , Figure 3 The outdoor unit 02 further comprises a plate heat exchanger 5 arranged between the liquid-side stop valve 7 and the refrigerant cooling module, and comprising a supercooling main loop 53; the supercooling main loop 53 is connected in series on the refrigerant main pipe; that is, the supercooling main loop 53 is connected with the liquid-side stop valve 7 and the outdoor electronic expansion valve 2 at two ends thereof.

[0054] The air conditioner of the embodiment supercools the refrigerant main pipe and the refrigerant returning to the refrigerant main pipe through the refrigerant branch pipe 45 by the plate heat exchanger 5, thereby improving the refrigeration capacity and efficiency.

[0055] In some specific embodiments, referring to Figure 2 , Figure 3 The outdoor unit 02 further comprises a plate heat exchanger 5 arranged between the liquid-side stop valve 7 and the refrigerant cooling module, and comprising a supercooling main loop 53; the supercooling main loop 53 is connected in series on the refrigerant main pipe; that is, the supercooling main loop 53 is connected with the liquid-side stop valve 7 and the outdoor electronic expansion valve 2 at two ends thereof.

[0056] The plate heat exchanger 5 further comprises an auxiliary branch loop 51 and an auxiliary electronic expansion valve 52; one end of the auxiliary branch loop 51 is connected with one end of the supercooling main loop 53 close to the liquid-side stop valve 7 through the auxiliary electronic expansion valve 52, and the other end is connected with the suction port of the compressor 1; that is, one end of the auxiliary branch loop 51 is connected with one end of the auxiliary electronic expansion valve 52, and the other end is connected with the suction port of the compressor 1; the other end of the auxiliary electronic expansion valve 52 is connected with one end of the supercooling main loop 53 close to the liquid-side stop valve 7.

[0057] The refrigerant passing through the supercooling main loop 53 enters the auxiliary branch loop 51 from one end of the auxiliary branch loop 51 through the auxiliary electronic expansion valve 52, exchanges heat with the refrigerant in the supercooling main loop 53 in the process of passing through the auxiliary branch loop 51, and returns to the suction port of the compressor 1 after passing through the auxiliary branch loop 51.

[0058] The inflow end 46 of the refrigerant branch loop is connected with one end of the supercooling main loop 53 close to the outdoor electronic expansion valve 2, and the outflow end 47 is connected with the suction port of the compressor 1.

[0059] The air conditioner of the embodiment returns the refrigerant of the refrigerant branch to the compressor 1 directly, avoids occupying the volume of the indoor heat exchanger, improves the heat exchange efficiency of the indoor heat exchanger, and thus increases the unit efficiency.

[0060] In some specific embodiments, with reference to Figure 2 、 Figure 3 , the outdoor unit 02 further comprises a gas-liquid separator 6, the other end of the auxiliary branch 51 is connected with the gas-liquid separator 6, and the gas-liquid separator 6 is connected with the suction port of the compressor 1; the outflow end 47 of the refrigerant branch pipe 45 is connected with the gas-liquid separator 6; that is, the outflow end 47 is connected with the suction port of the compressor 1 through the gas-liquid separator 6. Liquid refrigerant entering the compressor 1 through the suction port is prevented to generate liquid strike, and the compressor 1 is protected.

[0061] In some specific embodiments, with reference to Figure 1 、 Figure 2 、 Figure 3 , the refrigerant heat dissipation module further comprises a heat sink 44 connected with the refrigerant branch pipe 45 and the electronic control box, for conducting heat of the driving module to the refrigerant branch pipe 45.

[0062] In some specific embodiments, with reference to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 , the controller 8 is configured with an initial opening degree, a first temperature threshold, a second temperature threshold, a minimum opening degree, a first time threshold, a condensation prevention mode, a condensation condition, a non-condensation condition, and a safe condensation condition; the first temperature threshold is smaller than the second temperature threshold; the condensation condition is that a difference between the refrigerant temperature and the dew point temperature does not exceed the first temperature threshold; the non-condensation condition is that the difference between the refrigerant temperature and the dew point temperature reaches or exceeds the second temperature threshold; and the safe condensation condition is that the difference between the refrigerant temperature and the dew point temperature reaches or exceeds the first temperature threshold and does not exceed the second temperature threshold.

[0063] The controller 8 is configured to: when the compressor 1 is started, the heat dissipation electronic expansion valve 41 is controlled to open at the initial opening degree and execute the condensation prevention mode control.

[0064] The condensation prevention mode comprises: S1, the refrigerant temperature and the dew point temperature are obtained cyclically, and a difference between the refrigerant temperature and the dew point temperature is calculated; S2, it is judged whether the condensation condition, the non-condensation condition, or the safe condensation condition is met; if the condensation condition is met, S3 is executed; S3, the condensation condition control.

[0065] That is, if the condensation condition is satisfied, the opening degree of the heat radiating electronic expansion valve 41 is compared with the minimum opening degree S31; and if the opening degree of the heat radiating electronic expansion valve 41 reaches or is lower than the minimum opening degree, the operation time of the compressor 1 under the condensation condition is accumulated S32; if the opening degree of the heat radiating electronic expansion valve 41 reaches or is higher than the minimum opening degree, the opening degree of the heat radiating electronic expansion valve 41 is decreased S33.

[0066] The operation time of the compressor 1 under the condensation condition is accumulated specifically by obtaining the refrigerant temperature and the dew point temperature, calculating the difference between the refrigerant temperature and the dew point temperature S34, and judging whether the condensation condition is satisfied S35; if satisfied, the counting of the operation time of the compressor 1 under the condensation condition is continued S32; if not satisfied, the counting of the operation time of the compressor 1 is exited, and the judgment of whether the non-condensation condition and the safe condensation condition are satisfied is performed S2.

[0067] After the opening degree of the heat radiating electronic expansion valve 41 is decreased when the opening degree reaches or is higher than the minimum opening degree, the process returns to the obtaining of the refrigerant temperature, the dew point temperature, and the judgment of whether the condensation condition, the non-condensation condition, and the safe condensation condition are satisfied S2.

[0068] The operation time of the compressor 1 under the condensation condition is compared with the first time threshold S36; if the operation time reaches or exceeds the first time threshold, the compressor 1 is controlled to stop S37.

[0069] The air conditioner of the embodiment adjusts the opening degree of the heat radiating electronic expansion valve 41 to increase the refrigerant temperature, i.e., the difference between the refrigerant temperature and the dew point temperature, to reduce the risk of condensation when the condensation condition, i.e., the condition of generating condensation, is satisfied, or controls the compressor 1 to stop when the compressor 1 is operated under the condensation condition for the first time threshold, to prevent condensation from being generated, thereby improving the reliability of the driving module.

[0070] In some specific embodiments, with reference to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The controller 8 is configured with a fourth time threshold, and is configured to control the compressor 1 to stop when the operation time of the compressor 1 under the condensation condition reaches or exceeds the first time threshold, and then count the time, and control the compressor 1 to restart when the counted time reaches the fourth time threshold.

[0071] That is, the compressor 1 is controlled to stop when the compressor 1 is continuously operated under the condensation condition for the first time threshold, and the anti-condensation mode control is performed again when the compressor 1 is restarted. That is, the anti-condensation mode control of the opening degree of the heat radiating electronic expansion valve 41 is only performed when the compressor 1 is controlled to stop in the anti-condensation mode control.

[0072] In some specific embodiments, with reference to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , the controller 8 is further configured with a first maximum opening degree, a second time threshold, and configured to: when the compressor 1 is started, control the heat dissipation electronic expansion valve 41 to open at an initial opening degree and perform anti-condensation mode control.

[0073] The anti-condensation mode further includes: S1, cyclically acquire the refrigerant temperature and the dew point temperature, and calculate the difference between the refrigerant temperature and the dew point temperature; S2, determine whether the condensation condition, or the no-condensation condition, or the safe condensation condition is met; if the no-condensation condition is met, execute S4; S4, no-condensation condition control.

[0074] That is, if the no-condensation condition is met, first perform the judgment S41 of whether the opening degree of the heat dissipation electronic expansion valve 41 reaches or exceeds the first maximum opening degree; and if yes, accumulate the running time of the compressor 1 under the no-condensation condition S42; if no, increase the opening degree of the heat dissipation electronic expansion valve 41 S46, and return to the cyclic acquisition of the refrigerant temperature and the dew point temperature S1 and the judgment S2 of whether the condensation condition, the no-condensation condition, or the safe condensation condition is met.

[0075] At the same time as the accumulation of the running time of the compressor 1 under the no-condensation condition, determine whether the running time reaches the second time threshold S44; and if it reaches or exceeds the second time threshold, set the current opening degree of the heat dissipation electronic expansion valve 41 as the second maximum opening degree, and exit the anti-condensation mode S45.

[0076] If the second time threshold is not reached or exceeded, continue to accumulate the running time of the compressor 1 under the no-condensation condition S42; that is, cyclically acquire the refrigerant temperature and the dew point temperature S43 while accumulating the running time of the compressor 1, and perform the judgment S47 of whether the condensation condition is met, and if the condensation condition is met, continue to accumulate the running time S42; if the condensation condition is not met, perform the judgment S2 of whether the no-condensation condition or the safe condensation condition is met, and execute the no-condensation condition control or the safe condensation condition control according to the judgment result.

[0077] The air conditioner of the present embodiment performs no-condensation control when it is determined that the no-condensation condition is met, so that the opening degree of the heat dissipation electronic expansion valve 41 is as large as possible, thereby ensuring the heat dissipation effect.

[0078] In some specific embodiments, with reference to Figure 1、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 , the controller 8 is configured with a third time threshold and configured to: when the compressor 1 starts, the control heat dissipation electronic expansion valve 41 to open at an initial opening degree and execute anti-condensation mode control.

[0079] The anti-condensation mode further comprises: S1, the circulating acquisition of refrigerant temperature, dew point temperature, calculate the difference between the refrigerant temperature and the dew point temperature; S2, judge to meet the condensation condition, or no condensation condition, or safe condensation condition; if the safe condensation condition is met, execute S5; S5, safe condensation condition control.

[0080] The safe condensation condition control specifically includes: If the safe condensation condition is met, the cumulative timing of the compressor 1 operating time under the safe condensation condition is performed S51, and the operating time is compared with the third time threshold S52; when the operating time reaches or exceeds the third time threshold, the opening degree of the current heat dissipation electronic expansion valve 41 is set to the second maximum opening degree, and the anti-condensation mode control is exited S53.

[0081] If the third time threshold is not reached or exceeded, the refrigerant temperature and the dew point temperature are acquired S1, and it is judged whether the safe condensation condition is met S2; if yes, the cumulative timing of the compressor 1 operating time is continued S51; if no, the condensation condition control or the no condensation condition control is executed according to the judgment of the condensation condition or the no condensation condition.

[0082] The air conditioner of the embodiment executes safe condensation control when it is judged that the safe condensation condition is met, so that the heat dissipation effect and the opening degree of the heat dissipation electronic expansion valve 41 are kept stable, and the driving module reliability and the unit energy efficiency are improved.

[0083] In some specific embodiments, with reference to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 , the controller 8 is further configured with a normal mode, which controls the opening degree of the heat dissipation electronic expansion valve 41 according to the driving module temperature; the second time threshold is equal to the third time threshold.

[0084] The controller 8 is further configured to enter the normal mode from the anti-condensation mode.

[0085] In some specific embodiments, with reference to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 The controller 8 is further configured with a third temperature threshold, and the normal mode includes: S10, obtaining the driving module temperature when entering the normal mode; S20, comparing the driving module temperature with the third temperature threshold; if the driving module temperature does not exceed the third temperature threshold, performing S30; S30, maintaining the current opening degree of the heat-dissipation electronic expansion valve 41, and returning to the process of obtaining the driving module temperature and first comparing with the third temperature threshold and making a judgment.

[0086] The air conditioner of the embodiment maintains the opening degree of the heat-dissipation electronic expansion valve 41 when the driving module temperature meets the requirement of not exceeding the third temperature threshold, reduces the adjustment frequency of the heat-dissipation electronic expansion valve 41, improves the heat-dissipation effect and the stability of the non-condensation state, and improves the control efficiency and reduces the power consumption.

[0087] In some specific embodiments, with reference to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 The controller 8 is further configured with a fourth temperature threshold, which is greater than the third temperature threshold, and the normal mode further includes: S20, comparing the driving module temperature with the third temperature threshold; if the driving module temperature exceeds the third temperature threshold, performing S40; if the driving module temperature does not reach or exceed the third temperature threshold, performing S30; S30, maintaining the current opening degree of the heat-dissipation electronic expansion valve 41, and returning to the process S10 of obtaining the driving module temperature and first comparing with the third temperature threshold and making a judgment; S40, comparing the opening degree of the heat-dissipation electronic expansion valve 41 with the second maximum opening degree; if the opening degree of the heat-dissipation electronic expansion valve 41 reaches or exceeds the second maximum opening degree, performing S50; if the opening degree of the heat-dissipation electronic expansion valve 41 does not reach or exceed the second maximum opening degree, performing S70; S50, judging whether the driving module temperature reaches or exceeds the fourth temperature threshold value; if yes, executing S60; if the driving module temperature does not reach or exceed the fourth temperature threshold value, executing S30; S60, reducing the compressor 1 frequency, and returning to the flow S10 of cyclically acquiring the driving module temperature and first comparing and judging with the third temperature threshold value; S70, controlling the opening of the heat dissipation electronic expansion valve 41 to increase, and returning to the flow S10 of cyclically acquiring the driving module temperature and first comparing and judging with the third temperature threshold value.

[0088] The air conditioner of the embodiment controls the opening of the heat dissipation electronic expansion valve 41 or reduces the compressor 1 frequency through the judgment of the driving module and the fourth temperature threshold value, realizes the safe condensation state when the opening is lower than the second maximum opening and the solution method when the heat dissipation effect cannot be guaranteed in the safe condensation state, and guarantees the condensation safety and the heat dissipation effect.

[0089] In some specific embodiments, the cyclic acquisition of the refrigerant temperature, the dew point temperature, and the cyclic acquisition of the driving module temperature are all cyclically acquired and compared and judged for execution in a set period.

[0090] In some specific embodiments, the increase or decrease of the opening of the heat dissipation electronic expansion valve 41 is all uniformly increased or decreased through the way of setting the increase step or the decrease step.

[0091] Of course, it can also be realized through the way of setting the proportion of the current opening.

[0092] 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.

[0093] The above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in 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 conditioner, comprising an outdoor unit and an indoor unit; the outdoor unit comprising an outdoor electronic expansion valve, at least one compressor, and at least one drive module correspondingly connected to the compressor; The outdoor electronic expansion valve is connected to the indoor unit via the refrigerant main pipe; The drive module is located inside the electrical control box; The outdoor unit is characterized in that it further includes: The first temperature detection unit is installed inside the electrical control box and is used to detect the dew point temperature inside the electrical control box. At least one refrigerant heat dissipation module is provided corresponding to the drive module for heat dissipation, including a heat dissipation electronic expansion valve, a refrigerant branch pipe, a second temperature detection unit, and a third temperature detection unit; the refrigerant branch pipe includes an inlet end and an outlet end; the inlet end is connected to the refrigerant main pipe; the heat dissipation electronic expansion valve is provided on the refrigerant branch pipe; the second temperature detection unit is connected to the refrigerant branch pipe for detecting the refrigerant temperature; the third temperature detection unit is connected to the drive module for detecting the drive module temperature; The controller is electrically connected to the compressor, the thermal electronic expansion valve, the first temperature detection unit, the second temperature detection unit, and the third temperature detection unit, respectively. It is configured to control the corresponding thermal electronic expansion valve to open when the compressor is running, to cyclically acquire the dew point temperature, the refrigerant temperature, and the drive module temperature, and to control the opening degree of the thermal electronic expansion valve in stages according to the difference between the refrigerant temperature and the dew point temperature and the drive module temperature.

2. The air conditioner according to claim 1, characterized in that, The controller is configured with an initial opening degree, a first temperature threshold, a minimum opening degree, a first time threshold, an anti-condensation mode, and a condensation condition. The condensation condition is that the difference between the refrigerant temperature and the dew point temperature does not exceed the first temperature threshold. The controller is configured such that when the compressor is initially running, the heat dissipation electronic expansion valve opens at the initial opening degree and enters the anti-condensation mode. The anti-condensation mode includes: Obtain the refrigerant temperature and the dew point temperature; determine whether the condensation condition is met and whether the opening of the heat dissipation electronic expansion valve is not less than the minimum opening; if so, control the reduction of the opening of the heat dissipation electronic expansion valve. If the condensation condition is met and the opening degree of the heat dissipation electronic expansion valve does not exceed the minimum opening degree, the operating time of the compressor is timed; if the operating time reaches the first time threshold and the condensation condition is met during the period, the compressor is controlled to stop.

3. The air conditioner according to claim 2, characterized in that, The controller is configured with a second temperature threshold greater than the first temperature threshold, a first maximum opening degree, a second time threshold, and a non-condensation condition. The non-condensation condition is whether the difference between the refrigerant temperature and the dew point temperature exceeds the second temperature threshold. The anti-condensation mode also includes: If the non-condensation condition is met, then compare the opening degree of the heat dissipation electronic expansion valve with the first maximum opening degree. If the opening of the heat dissipation electronic expansion valve does not exceed the first maximum opening, then control the heat dissipation electronic expansion valve to increase its opening. If the opening degree of the heat dissipation electronic expansion valve reaches the first maximum opening degree, the operating time of the compressor is timed; if the operating time reaches the second time threshold and the non-condensation condition is met during the period, the opening degree of the heat dissipation electronic expansion valve at this time is obtained and defined as the second maximum opening degree, and the anti-condensation mode is exited.

4. The air conditioner according to claim 3, characterized in that, The controller is configured with a third time threshold and a safe condensation condition. The safe condensation condition is that the difference between the refrigerant temperature and the dew point temperature exceeds the first temperature threshold but does not exceed the second temperature threshold. The anti-condensation mode also includes: If the safety condensation condition is met, the operating time of the compressor is timed; if the operating time reaches the third time threshold and the safety condensation condition is met during the period, the opening degree of the heat dissipation electronic expansion valve at this time is obtained and defined as the second maximum opening degree, and the anti-condensation mode is exited.

5. The air conditioner according to claim 4, characterized in that, The controller is also configured with a normal mode, which controls the opening of the heat dissipation electronic expansion valve according to the temperature of the drive module; the second time threshold is equal to the third time threshold; The controller is also configured to enter the normal mode when exiting the anti-condensation mode.

6. The air conditioner according to claim 5, characterized in that, The controller is configured with a third temperature threshold and is configured in the normal mode including: Obtain the temperature of the drive module; Compare the temperature of the drive module with the third temperature threshold; If the temperature of the drive module does not exceed the third temperature threshold, the current opening of the heat dissipation electronic expansion valve is maintained.

7. The air conditioner according to claim 6, characterized in that, The controller is configured with a fourth temperature threshold, which is greater than the third temperature threshold; the normal mode further includes: If the temperature of the drive module exceeds the third temperature threshold, the opening degree of the heat dissipation electronic expansion valve is compared with the second maximum opening degree. If the opening of the thermal electronic expansion valve reaches the second maximum opening, it is determined whether the temperature of the drive module exceeds the fourth temperature threshold; if yes, the frequency of the compressor is reduced; if no, the current opening of the thermal electronic expansion valve is maintained.

8. The air conditioner according to claim 7, characterized in that, The general pattern also includes: If the opening of the heat dissipation electronic expansion valve does not reach the second maximum opening, the heat dissipation electronic expansion valve is controlled to increase its opening, and the temperature of the drive module is continuously acquired and compared with the third temperature threshold.

9. The air conditioner according to any one of claims 1 to 8, characterized in that, The outdoor unit also includes a plate heat exchanger and a gas-liquid separator; the plate heat exchanger includes a subcooling main circuit, which is connected in series on the refrigerant main circuit, and the refrigerant branch pipe is connected in parallel with the refrigerant main pipe and is located between the outdoor electronic expansion valve and the subcooling main circuit.

10. The air conditioner according to any one of claims 1 to 8, characterized in that, The outdoor unit also includes a plate heat exchanger and a gas-liquid separator; the plate heat exchanger includes an auxiliary branch, one end of which is connected to the gas-liquid separator; The outflow end is connected to one end of the auxiliary branch.

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