Electric control box assembly, air conditioner and external unit mainboard temperature control method

Abstract

The present invention provides an electric control box assembly, an air conditioner and an external mainboard temperature control method, which relates to the technical field of air conditioners and is designed to solve the problem that the existing air conditioner outdoor unit has a high risk of explosion during use. The electric control box assembly includes an electric control box, an external mainboard and a mainboard radiator. The electric control box is a sealed box body. The external mainboard and the mainboard radiator are both arranged in the electric control box. The mainboard radiator is configured to allow the refrigerant to flow inside. The air conditioner includes the above-mentioned electric control box assembly. The external mainboard temperature control method is used to control the temperature of the external mainboard of the air conditioner. The electric control box assembly and the air conditioner provided by the present invention have a low risk of explosion, and the external mainboard temperature control method can achieve effective cooling of the external mainboard.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an electric control box component, an air conditioner and a temperature control method for an external unit mainboard. Background Art

[0002] Some air conditioner outdoor units are equipped with a controller motherboard (hereinafter referred to as the outdoor motherboard), which is used to collect information such as the operating mode of the air conditioner indoor unit and the outdoor temperature to control the efficient operation of components such as the compressor, fan and expansion valve. However, since electrical components are installed on the outdoor motherboard, there is a high risk of explosion when flammable refrigerant leaks. Summary of the invention

[0003] The first object of the present invention is to provide an electric control box assembly to solve the technical problem that the existing air-conditioning outdoor unit has a high risk of explosion during use.

[0004] The electric control box assembly provided by the present invention comprises an electric control box, an external mainboard and a mainboard radiator. The electric control box is a sealed box body. The external mainboard and the mainboard radiator are both arranged in the electric control box. The mainboard radiator is configured to allow refrigerant to flow inside it.

[0005] Since the external unit mainboard is arranged in the electric control box formed by the sealed box body, when the air-conditioning outdoor unit produces a flammable refrigerant leak, the above-mentioned arrangement can protect and isolate the external unit mainboard, reduce or even prevent the leaked flammable refrigerant from entering the electric control box, and ensure that the concentration of the flammable refrigerant in the electric control box is lower than the explosion value, thereby reducing the risk of explosion and improving the safety of the external unit mainboard during the operation of the air conditioner.

[0006] At the same time, by installing the mainboard radiator in the electrical control box, the refrigerant flowing through the mainboard radiator is used to cool the outdoor unit mainboard, without relying on the air conditioner outdoor unit fan for convection heat exchange. Therefore, the situation in which the leakage of refrigerant enters the outdoor unit mainboard through the gap between the screw holes of the mainboard radiator and the outdoor unit mainboard due to the traditional mainboard radiator and the outdoor unit mainboard being fixed with screws is avoided, thereby further reducing the risk of combustion and explosion.

[0007] Furthermore, the mainboard radiator is attached to the external mainboard. This arrangement can ensure that the mainboard radiator and the external mainboard can perform sufficient heat exchange.

[0008] Furthermore, the mainboard radiator is located below the external mainboard, so that the condensed water generated in the electric control box can drip to the bottom of the box body, and will not adhere to the external mainboard and cause adverse effects on the external mainboard.

[0009] Furthermore, the mainboard radiator is a parallel flow radiator. This configuration saves box space and has a high heat dissipation efficiency.

[0010] Furthermore, the inner bottom surface of the electric control box is provided with a guide slope, and the guide slope is configured to guide the condensed water to gather at the bottom of the electric control box. Such a configuration can reduce the contact between the condensed water and the external mainboard, thereby reducing the adverse effects of the condensed water on the external mainboard.

[0011] Furthermore, a drainage hole is provided on the bottom wall of the electric control box, and a one-way drainage structure is provided at the drainage hole, and the one-way drainage structure is configured to only drain the condensed water in the electric control box. Such a configuration ensures that the condensed water in the electric control box is drained in time, and can also prevent the refrigerant leaked from the outside from entering the electric control box through the drainage hole.

[0012] Furthermore, the one-way drainage structure includes an S-shaped water channel, the upper wall of the S-shaped water channel is staggered to form an upper convex part and an upper groove part, and the lower wall of the S-shaped water channel is staggered to form a lower groove part and a lower convex part, wherein the lower groove part is opposite to the upper convex part, the lower convex part is opposite to the upper groove part, and the apex of the lower convex part is higher than the bottom end of the upper convex part. This form of one-way drainage structure can achieve one-way conduction of the drainage hole only by using the principle of liquid level balance, and has a simple structure and low cost.

[0013] The second object of the present invention is to provide an air conditioner to solve the technical problem that the existing air conditioner outdoor unit has a high risk of explosion during use.

[0014] The air conditioner provided by the present invention comprises a refrigeration circuit and the above-mentioned electric control box assembly, wherein the refrigeration circuit comprises a compressor, a condenser, a throttle and an evaporator arranged in series in sequence, and the medium inlet and the medium outlet of the mainboard radiator are both connected to the refrigeration circuit.

[0015] By arranging the above-mentioned electric control box assembly in the air conditioner, the air conditioner accordingly has all the advantages of the above-mentioned electric control box assembly, which will not be described one by one here.

[0016] Furthermore, the medium inlet is connected to the outlet of the evaporator. By connecting the medium inlet of the mainboard radiator to the outlet of the evaporator, when the air conditioner is in operation, the refrigerant with a relatively low temperature flowing out of the evaporator can enter through the medium inlet of the mainboard heat exchanger, exchange heat for the external mainboard, and then flow out through the medium outlet of the mainboard heat exchanger, and further enter the refrigeration circuit of the air conditioner to continue to participate in the refrigeration cycle of the air conditioner.

[0017] This form of using the refrigerant in the air conditioner refrigeration circuit as the refrigerant for the mainboard radiator effectively utilizes the refrigerant in the air conditioner refrigeration circuit, does not require the installation of other refrigerant circuits, and has a low cost.

[0018] Furthermore, the medium outlet is arranged to communicate with the inlet of the compressor. This arrangement not only reduces the waste of refrigerant, but also ensures the refrigeration effect of the air conditioner.

[0019] Furthermore, the outlet of the evaporator is connected to the inlet of the compressor through a main pipeline, the main pipeline is provided with a branch pipeline connected to the medium inlet, and the branch pipeline is provided with an electronic expansion valve. The electronic expansion valve can be used to control the amount of refrigerant entering the mainboard radiator, thereby adjusting the heat dissipation efficiency of the external unit mainboard.

[0020] Furthermore, a pressure sensor is installed on the mainboard radiator of the electric control box assembly, and the pressure sensor is used to detect the pressure of the mainboard radiator when it is working. This arrangement realizes the detection of the pressure of the mainboard radiator when it is working, so that the air conditioner can make corresponding adjustments according to the pressure feedback.

[0021] Furthermore, a first temperature sensor is installed on the mainboard radiator, and the first temperature sensor is used to detect the temperature of the mainboard radiator when it is working. This arrangement realizes the detection of the temperature of the mainboard radiator when it is working, so that the air conditioner can make corresponding adjustments according to the temperature feedback.

[0022] Furthermore, a second temperature sensor is installed on the external mainboard, and the second temperature sensor is used to detect the temperature of the external mainboard. This arrangement enables the detection of the temperature of the external mainboard during the operation of the air conditioner, so that the air conditioner can make corresponding adjustments based on temperature feedback.

[0023] The third object of the present invention is to provide a method for controlling the temperature of an external unit mainboard, so as to solve the technical problem that the existing air-conditioning outdoor unit cannot effectively cool down the external unit mainboard during use.

[0024] The external mainboard temperature control method provided by the present invention is used to control the temperature of the external mainboard of the air conditioner, and comprises the following steps:

[0025] Acquire the temperature of the external mainboard and the temperature difference between the external mainboard and the mainboard radiator;

[0026] The refrigerant flow rate flowing through the mainboard radiator is controlled according to the temperature of the external mainboard and the temperature difference between the external mainboard and the mainboard radiator.

[0027] The external machine mainboard temperature control method collects the temperature T of the mainboard radiator. 盘 and the temperature T of the external mainboard 板The two are compared accordingly, and the flow of refrigerant flowing through the mainboard radiator is adjusted using a certain control logic, thereby achieving effective cooling of the external unit mainboard, enabling it to work normally, and thus ensuring the efficient operation of the corresponding components in the air-conditioning outdoor unit.

[0028] Further, controlling the refrigerant flow through the mainboard radiator according to the temperature of the external mainboard and the temperature difference between the external mainboard and the mainboard radiator includes:

[0029] When the temperature difference between the external mainboard and the mainboard radiator is within a preset temperature difference range, and the temperature of the external mainboard is within a preset temperature range, controlling the refrigerant in the mainboard radiator to flow at a first flow rate;

[0030] When the temperature difference between the external mainboard and the mainboard radiator is greater than the maximum temperature difference of the preset temperature difference range, or the temperature of the external mainboard is greater than or equal to the maximum temperature of the preset temperature range, controlling the refrigerant in the mainboard radiator to flow at a second flow rate;

[0031] When the temperature difference between the external mainboard and the mainboard radiator is less than the minimum temperature difference of the preset temperature difference range, or the temperature of the external mainboard is less than or equal to the minimum temperature of the preset temperature range, the refrigerant in the mainboard radiator is controlled to flow at a third flow rate;

[0032] The first flow rate is smaller than the second flow rate and larger than the third flow rate.

[0033] When the temperature of the external mainboard is not much different from the temperature of the mainboard radiator and the temperature of the external mainboard is moderate, the flow of the refrigerant flowing through the mainboard radiator remains unchanged, that is, the temperature of the external mainboard is still maintained at the current state; when the temperature of the external mainboard is greatly different from the temperature of the mainboard radiator or the temperature of the external mainboard is high, the flow of the refrigerant flowing through the mainboard radiator is increased to reduce the temperature of the mainboard radiator, thereby achieving the purpose of quickly cooling the external mainboard; when the temperature of the external mainboard is not much different from the temperature of the mainboard radiator or the temperature of the external mainboard is low, at this time, the mainboard radiator does not need to perform excessive heat exchange, and the flow of the refrigerant flowing through the mainboard radiator can be reduced. Using this external mainboard temperature control method, the temperature of the external mainboard can be adjusted in real time according to its current state, ensuring that the temperature of the external mainboard can be relatively stable within a certain range.

[0034] Furthermore, controlling the refrigerant in the mainboard radiator to flow at a second flow rate includes increasing the opening of the electronic expansion valve; controlling the refrigerant in the mainboard radiator to flow at a third flow rate includes reducing the opening of the electronic expansion valve.

[0035] This method of regulating the refrigerant flow is sensitive and responsive.

[0036] Further, the obtaining of the temperature of the external mainboard and the temperature difference between the external mainboard and the mainboard radiator includes:

[0037] The temperature of the external mainboard and the temperature of the mainboard radiator are obtained, and the temperature difference between the temperature of the external mainboard and the mainboard radiator is calculated. In this acquisition method, the data obtained is more accurate.

[0038] Furthermore, the method further comprises the steps of:

[0039] Obtaining a first pressure when the motherboard radiator is in operation, and comparing the pressure with a second pressure when condensation is generated on the motherboard radiator;

[0040] When the refrigerant in the mainboard radiator flows at the third flow rate, it is determined whether the first pressure is less than the second pressure. If so, the flow rate flowing through the mainboard radiator is increased until the first pressure is greater than or equal to the second pressure.

[0041] Such an arrangement avoids the situation where excessive condensation is generated due to too little refrigerant flowing through the mainboard radiator, thereby ensuring the normal operation of the mainboard radiator. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0043] Figure 1 A schematic diagram of the internal structure of an air conditioner outdoor unit of an air conditioner provided in an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of the structure decomposition of the electric control box assembly provided in an embodiment of the present invention;

[0045] Figure 3 A structural side view of an electric control box of an electric control box assembly provided by an embodiment of the present invention;

[0046] Figure 4 A side view of a partial structure of an electric control box of an electric control box assembly provided by an embodiment of the present invention;

[0047] Figure 5 A structural cross-sectional view of a box body of an electric control box of an electric control box assembly provided in an embodiment of the present invention;

[0048] Figure 6 for Figure 5 A magnified view of the local structure at point A in the middle;

[0049] Figure 7 A schematic diagram of a refrigeration system of an air conditioner provided in an embodiment of the present invention;

[0050] Figure 8 A temperature control flow chart of an external mainboard of an air conditioner provided in an embodiment of the present invention.

[0051] Description of reference numerals:

[0052] 010-electric control box assembly; 020-fan; 030-compressor; 040-casing; 041-partition; 050-evaporator; 060-condenser; 070-throttle; 080-electronic expansion valve;

[0053] 100-electric control box; 200-external machine mainboard; 300-mainboard radiator; 400-accommodation cavity;

[0054] 110-box cover; 120-box body;

[0055] 121-first wall; 122-second wall; 123-drain hole; 124-lower groove portion; 125-upper raised portion; 126-lower raised portion; 127-upper groove portion;

[0056] 410 - first guide slope; 420 - second guide slope. DETAILED DESCRIPTION

[0057] At present, the main research directions of household air conditioning refrigerants are no damage to the ozone layer and low greenhouse effect, followed by good thermal properties, high safety and low production costs. The research objects have gradually transitioned from R22 refrigerants to R410A refrigerants and R32 refrigerants, which have been applied in the market in batches. However, R290 refrigerant, which has the lowest cost, the least impact on the environment and better thermal properties, has not been mass-produced and put on the market due to its flammable and explosive characteristics.

[0058] Although R290 refrigerant has many excellent properties such as high liquefaction critical temperature, moderate evaporation saturation pressure, low solidification temperature, low viscosity coefficient, high thermal conductivity, and small insulation coefficient, its ignition point is only 468°C, and its minimum lower flammable limit (LFL) and maximum upper flammable limit (UFL) are both low, at 2.1% (volume fraction) and 9.5% (volume fraction) respectively, making R290 refrigerant obviously flammable and explosive.

[0059] Unlike fixed-frequency air conditioners, variable-frequency air conditioners have an additional outdoor mainboard on the outdoor unit, which is used to collect information such as the operating mode of the indoor unit and the outdoor temperature, in order to control the efficient operation of components such as the compressor, fan, and expansion valve. According to relevant requirements, high-risk components on the mainboard that may become ignition sources (such as relays, contactors, thermostats, and glass fuses, etc.) must use explosion-proof components, and electrical components are recommended to be installed in explosion-proof housings to prevent flammable refrigerants from leaking and being ignited. Even so, the use of flammable and explosive R290 refrigerant still poses a risk of explosion.

[0060] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0061] Figure 1 The internal structure diagram of the outdoor unit of the air conditioner provided in this embodiment is as follows: Figure 2 The schematic diagram of the structure decomposition of the electric control box assembly 010 provided in this embodiment. Figure 1 and Figure 2 As shown, this embodiment provides an electric control box assembly 010, which is installed in the outdoor unit of the air conditioner. Specifically, the electric control box assembly 010 includes an electric control box 100, an outdoor unit main board 200 and a main board radiator 300, wherein the electric control box 100 is a sealed box body, the outdoor unit main board 200 and the main board radiator 300 are both arranged in the electric control box 100, and the main board radiator 300 is configured to allow the refrigerant to flow therein.

[0062] Since the external main board 200 is arranged in the electric control box 100 formed by the sealed box body, when the air-conditioning outdoor unit generates a flammable refrigerant leak, the above-mentioned arrangement can protect and isolate the external main board 200, reduce or even prevent the leaked flammable refrigerant from entering the electric control box 100, and ensure that the concentration of the flammable refrigerant in the electric control box 100 is lower than the explosion value, thereby reducing the risk of explosion and improving the safety of the external main board 200 during the operation of the air conditioner.

[0063] At the same time, by installing the mainboard radiator 300 in the electric control box 100, the refrigerant flowing through the mainboard radiator 300 is used to cool the external mainboard 200, without relying on the air conditioner outdoor unit fan 020 for convection heat exchange. Therefore, the leakage of refrigerant entering the external mainboard 200 through the gap between the screw holes of the mainboard radiator 300 and the external mainboard 200 due to the traditional fixing of the mainboard radiator 300 and the external mainboard 200 with screws is avoided, thereby further reducing the risk of explosion.

[0064] Please continue to refer to Figure 2In this embodiment, the electric control box 100 includes a box cover 110 and a box body 120, wherein the box body 120 is provided with an opening, and the external machine mainboard 200 can be placed into the box body 120 through the opening, and the box cover 110 covers the opening, and the box cover 110 is sealed and connected to the box body 120. Specifically, a sealing strip can be provided between the box cover 110 and the box body 120, and the sealing strip is used to achieve a sealed connection between the two; or, a gluing process can be performed between the box cover 110 and the box body 120, so as to achieve a sealed connection between the box cover 110 and the box body 120.

[0065] Please continue to refer to Figure 2 In this embodiment, the mainboard radiator 300 is fixedly attached to the external mainboard 200. Such a configuration can not only ensure that the mainboard radiator 300 and the external mainboard 200 can fully exchange heat, enhance the heat dissipation effect of the mainboard radiator 300 on the external mainboard 200, but also fix the external mainboard 200 in a corresponding position, avoid damage to the external mainboard 200 and the mainboard radiator 300 caused by vibration of the air conditioner outdoor unit, and extend the service life of the electric control box assembly 010.

[0066] Preferably, a portion of the box body 120 forms a receiving cavity 400 . When the external machine mainboard 200 and the mainboard radiator 300 are installed in the electric control box 100 , the mainboard radiator 300 is accommodated in the receiving cavity 400 .

[0067] Please continue to refer to Figure 2 In this embodiment, the mainboard radiator 300 is located below the external mainboard 200. During operation, the mainboard radiator 300 uses the refrigerant flowing through it to dissipate heat for the external mainboard 200. By arranging the radiator below the external mainboard 200, the condensed water attached to the surface of the mainboard radiator 300 due to the cooling of the refrigerant in this process can drip into the accommodating cavity 400, and will hardly affect the external mainboard 200, thereby ensuring the working reliability of the external mainboard 200 and further extending the working life of the electric control box assembly 010 of this embodiment.

[0068] Preferably, in this embodiment, the mainboard radiator 300 is a parallel flow radiator. Such a configuration not only saves the space of the box body 120, facilitates the miniaturization design of the electric control box 100, but also improves the heat dissipation efficiency of the external mainboard 200.

[0069] Figure 3 The structure side view of the electric control box 100 of the electric control box assembly 010 provided in this embodiment is as follows:

[0070] Figure 4 This is a partial structural side view of the electric control box 100 of the electric control box assembly 010 provided in this embodiment. Figure 1 and Figure 2, and combined with Figure 3 and Figure 4 In this embodiment, a guide slope is provided on the inner bottom surface of the electric control box 100 , wherein the guide slope is configured to guide the condensed water to gather toward the bottom of the electric control box 100 .

[0071] By setting a guide slope on the inner bottom surface of the electrical control box 100, the condensed water generated during the cooling process of the mainboard radiator 300 can flow along the guide slope to the bottom of the electrical control box 100, reducing the contact between the condensed water and the external mainboard 200, thereby reducing the adverse effects of the condensed water on the external mainboard 200.

[0072] Figure 5 This is a structural cross-sectional view of the box body 120 of the electric control box 100 of the electric control box assembly 010 provided in this embodiment, Figure 6 for Figure 5 The enlarged view of the local structure at A in the middle. Please continue to refer to Figures 1 to 4 , and combined with Figure 5 and Figure 6 In this embodiment, a drainage hole 123 is provided on the bottom wall of the electric control box 100 . Specifically, a one-way drainage structure is provided at the drainage hole 123 , wherein the one-way drainage structure is configured to only drain the condensed water in the electric control box 100 .

[0073] By providing a drainage hole 123 on the bottom wall of the electric control box 100, the condensed water collected at the bottom of the electric control box 100 can be discharged in time, thereby reducing the risk of short-circuiting the external main board 200 due to the condensed water filling the electric control box 100 and soaking the external main board 200, thereby ensuring the working reliability of the external main board 200.

[0074] In addition, a one-way drainage structure is provided at the drainage hole 123, wherein the one-way drainage structure only allows the condensed water in the electrical control box 100 to be discharged outwardly, and does not allow external impurities to enter the electrical control box 100, thereby avoiding the risk of explosion caused by the refrigerant leaking from the outside entering the electrical control box 100 through the drainage hole 123.

[0075] Please continue to refer to Figure 5 and Figure 6 In this embodiment, the one-way drainage structure may include an S-shaped water guiding channel. Specifically, the upper wall surface of the S-shaped water guiding channel is staggered to form an upper protrusion 125 and an upper groove portion 127, and the lower wall surface of the S-shaped water guiding channel is staggered to form a lower groove portion 124 and a lower protrusion 126, wherein the lower groove portion 124 is opposite to the upper protrusion 125, the lower protrusion 126 is opposite to the upper groove portion 127, and the vertex of the lower protrusion 126 is higher than the bottom end of the upper protrusion 125.

[0076] During the operation of the air conditioner, the condensed water in the electric control box 100 is discharged through the S-shaped water guide channel. When a certain amount of condensed water accumulates in the S-shaped water guide channel, since the top of the lower protrusion 126 is higher than the bottom of the upper protrusion 125, that is, the upper protrusion 125 is embedded in the lower groove 124, the channel flowing through the upper protrusion 125 and the lower groove 124 is sealed. When condensed water continues to be generated in the electric control box 100, according to the principle of liquid level balance, the gradually increasing condensed water can be continuously discharged outward. While the gradually increasing condensed water is discharged outward, since the upper protrusion 125 is embedded in the lower groove 124, the S-shaped water guide channel is still kept in a liquid-sealed state. In the above process, since the S-shaped water guide channel is always kept in a liquid-sealed state, the refrigerant leaked from the outside will not enter the electric control box 100.

[0077] This one-way drainage structure can achieve one-way conduction of the drainage hole 123 only by utilizing the liquid level balance principle, and has a simple structure and low cost.

[0078] It should be noted that the upper protrusion 125 and the lower groove 124 can be a triangular structure as shown in the figure, but are not limited thereto, and other arrangements can also be adopted, such as: the upper protrusion 125 and the lower groove 124 are arranged as an interlocking rectangular structure, or the upper protrusion 125 is arranged as a triangular structure and the lower groove 124 is arranged as a rectangular structure. As long as the upper protrusion 125 and the lower groove 124 are arranged in this way, the liquid seal can be achieved by utilizing the liquid level balance principle, thereby achieving unidirectional conduction of the drain hole 123. The shapes of the upper groove 127 and the lower protrusion 126 are similar to those of the upper protrusion 125 and the lower groove 124, so they will not be described in detail.

[0079] Please continue to refer to Figure 5 and Figure 6 In this embodiment, the bottom wall of the electric control box 100 includes a first wall 121 and a second wall 122, which are respectively connected to different side walls of the electric control box 100, and the S-shaped water channel is located between the first wall 121 and the second wall 122. Specifically, the distance from the upper protrusion 125 to the outer bottom surface of the electric control box 100 is h1, and the distance from the lower protrusion 126 to the outer bottom surface of the electric control box 100 is h2. The upper protrusion 125 is embedded in the lower groove 124, that is, h1 <h2。

[0080] Please continue to refer to Figure 3 and Figure 4In this embodiment, the guide slope includes a first guide slope 410 and a second guide slope 420. Specifically, the first guide slope 410 is formed by the first wall 121, and the second guide slope 420 is formed by the second wall 122, wherein the angle between the first wall 121 and the horizontal plane is α, and the angle between the second wall 122 and the horizontal plane is β, and the drainage hole 123 is arranged at the free ends of the first wall 121 and the second wall 122.

[0081] This structural form in which the first guide slope 410 and the second guide slope 420 are directly formed by the first wall 121 and the second wall 122 of the box body 120, respectively, does not require additional processing of the slope in the box body 120, thereby reducing the manufacturing cost of the box body 120. In addition, by arranging the first wall 121 and the second wall 122 at different angles to the horizontal plane, the drainage hole 123 is offset, so that the condensed water discharged through the drainage hole 123 can avoid the fan 020 of the air conditioner outdoor unit, and will not directly drip onto the fan 020, thereby reducing the impact on the fan 020.

[0082] It should be noted that, in actual use, the verticality of α and β can be adjusted according to the specific setting position of the fan 020 in the air-conditioning outdoor unit.

[0083] Figure 7 This is a schematic diagram of the refrigeration system of the air conditioner provided in this embodiment. Please continue to refer to Figure 1 , and combined with Figure 7 This embodiment also provides an air conditioner, including a refrigeration circuit and the above-mentioned electric control box assembly 010. Specifically, the refrigeration circuit includes a compressor 030, a condenser 060, a throttle 070 and an evaporator 050 arranged in series in sequence, and the medium inlet and the medium outlet of the mainboard radiator 300 are both connected to the refrigeration circuit.

[0084] By setting the above-mentioned electric control box assembly 010 in the air conditioner, the air conditioner accordingly has all the advantages of the above-mentioned electric control box assembly 010, which will not be described one by one here.

[0085] Please continue to refer to Figure 7 In this embodiment, the medium inlet is connected to the outlet of the evaporator 050.

[0086] By connecting the medium inlet of the mainboard radiator 300 to the outlet of the evaporator 050, when the air conditioner is in operation, the refrigerant with a lower temperature flowing out of the evaporator 050 can enter through the medium inlet of the mainboard heat exchanger, exchange heat with the external mainboard 200, and then flow out through the medium outlet of the mainboard heat exchanger, and further enter the refrigeration circuit of the air conditioner to continue to participate in the refrigeration cycle of the air conditioner.

[0087] This form of using the refrigerant in the air conditioner refrigeration circuit as the refrigerant of the mainboard radiator 300 effectively utilizes the refrigerant in the air conditioner refrigeration circuit, does not need to set up other refrigerant circuits, and has low cost.

[0088] Please continue to refer to Figure 1 In this embodiment, the air conditioner includes an air conditioner outdoor unit, the air conditioner outdoor unit includes a housing 040, and the electric control box assembly 010 is installed on the housing 040 through the electric control box 100. Specifically, the housing 040 includes a partition 041, and the electric control box 100 is inserted into the partition 041, with a part located on one side of the fan 020 and the other part located on one side of the compressor 030.

[0089] Please continue to refer to Figure 7 In this embodiment, the medium outlet of the mainboard radiator 300 is connected to the inlet of the compressor 030. This arrangement allows the refrigerant to flow directly back to the compressor 030 for pressurization to continue to participate in the refrigeration cycle after flowing through the mainboard radiator 300 to dissipate heat to the external mainboard 200, thereby reducing the waste of refrigerant and ensuring the refrigeration effect of the air conditioner.

[0090] During the operation of the air conditioner, the low-temperature refrigerant flowing out through the evaporator 050 will mainly flow into the compressor 030 to participate in the refrigeration cycle of the air conditioner. A small amount of refrigerant enters the mainboard radiator 300 through the medium inlet of the mainboard radiator 300 to dissipate heat for the external mainboard 200. After that, the refrigerant that has undergone heat exchange is discharged through the medium outlet and flows to the compressor 030.

[0091] Please continue to refer to Figure 7 In this embodiment, the outlet of the evaporator 050 is connected to the inlet of the compressor 030 through a main pipeline, and the main pipeline is provided with a branch pipeline connected to the medium inlet, wherein the branch pipeline is provided with an electronic expansion valve 080. During the operation of the air conditioner, the opening of the electronic expansion valve 080 can be adjusted to control the amount of refrigerant entering the mainboard radiator 300, thereby achieving the adjustment of the heat dissipation efficiency of the external unit mainboard 200.

[0092] Preferably, in this embodiment, a pressure sensor is installed on the mainboard radiator 300 of the electric control box assembly 010, wherein the pressure sensor is used to detect the pressure of the mainboard radiator 300 when it is working. Such a setting realizes the detection of the pressure of the mainboard radiator 300 when it is working, so that the air conditioner can be adjusted accordingly according to the pressure feedback.

[0093] Preferably, in this embodiment, a first temperature sensor is installed on the mainboard radiator 300, wherein the first temperature sensor is used to detect the working temperature of the mainboard radiator 300. Such a setting realizes the detection of the working temperature of the mainboard radiator 300, so that the air conditioner can make corresponding adjustments according to the temperature feedback.

[0094] Preferably, in this embodiment, a second temperature sensor is installed on the external mainboard 200 , wherein the second temperature sensor is used to detect the temperature of the external mainboard 200 when it is working.

[0095] The present embodiment also provides an external mainboard temperature control method for controlling the temperature of the external mainboard 200 of the air conditioner, comprising the following steps: obtaining the temperature of the external mainboard 200 and the temperature difference between the external mainboard 200 and the mainboard radiator 300; and controlling the refrigerant flow through the mainboard radiator 300 according to the temperature of the external mainboard 200 and the temperature difference between the external mainboard 200 and the mainboard radiator 300.

[0096] like Figure 8 As shown, the air conditioner is turned on and the temperature T of the external mainboard 200 is obtained. 板 And the temperature T of the external mainboard 200 板 With the temperature of the motherboard heat sink 300 T 盘 The temperature difference T 板 -T 盘 , and then, the refrigerant flow through the mainboard radiator 300 is controlled according to the corresponding data.

[0097] Specifically, when the temperature difference T between the external mainboard 200 and the mainboard radiator 300 is 板 -T 盘 is within the preset temperature difference range, and the temperature T of the external mainboard 200 is 板 When the temperature is within a preset range, the refrigerant in the mainboard heat sink 300 is controlled to flow at a first flow rate.

[0098] When the temperature difference T between the external mainboard 200 and the mainboard radiator 300 is 板 -T 盘 is greater than the maximum temperature difference of the preset temperature difference range, or the temperature T of the external mainboard 200 板 When the temperature is greater than or equal to the maximum temperature in the preset temperature range, the refrigerant in the mainboard heat sink 300 is controlled to flow at a second flow rate.

[0099] When the temperature difference T between the external mainboard 200 and the mainboard radiator 300 is 板 -T 盘 is smaller than the minimum temperature difference of the preset temperature difference range, or the temperature T of the external mainboard 200 is 板 When the temperature is less than or equal to the minimum temperature of the preset temperature range, the refrigerant in the mainboard heat sink 300 is controlled to flow at a third flow rate.

[0100] The first flow rate is smaller than the second flow rate and larger than the third flow rate.

[0101] After the air conditioner is turned on and runs for a set time, the temperature T of the mainboard radiator 300 is obtained. 盘 and the temperature T of the external mainboard 200 板 ; When K1 ≥ T 板 -T 盘 ≥K2, and T 主板上限 >T 板 >T 主板下限 When T 板 -T 盘 >K1 or T 板 ≥T 主板上限 When K1 is greater than T, the flow rate of the refrigerant flowing through the mainboard radiator 300 is increased, that is, the refrigerant flows through the mainboard radiator 300 at the second flow rate until K1 ≥ T 板 -T 盘 ≥K2, and T 主板上限 >T 板 >T 主板下限 When T 板 -T 盘 <K2 or T 板 ≤T 主板下限 When K1≥T, the flow rate of the refrigerant flowing through the mainboard radiator 300 is reduced, that is, the refrigerant flows through the mainboard radiator at the third flow rate until K1≥T 板 -T 盘 ≥K2, and T 主板上限 >T 板 >T 主板下限 When the refrigerant flow rate through the mainboard radiator 300 is kept constant. Wherein, K1 is the first parameter of the air conditioner, K2 is the second parameter of the air conditioner, T 主板上限 is the upper temperature limit allowed by the external mainboard 200, T 主板下限 It is the lower limit temperature value allowed by the external mainboard 200.

[0102] The external machine mainboard temperature control method collects the temperature T of the mainboard radiator 300. 盘 and the temperature T of the external mainboard 200 板, and compare the two accordingly, and use a certain control logic to adjust the flow rate of the refrigerant flowing through the mainboard radiator 300. When the temperature of the external mainboard 200 is not much different from the temperature of the mainboard radiator 300 and the temperature of the external mainboard 200 is moderate, the flow rate of the refrigerant flowing through the mainboard radiator 300 remains unchanged, that is, the temperature of the external mainboard 200 is still maintained at the current state; when the temperature of the external mainboard 200 is significantly different from the temperature of the mainboard radiator 300 or the temperature of the external mainboard 200 is high, the flow rate of the refrigerant flowing through the mainboard radiator 300 is increased to reduce the temperature of the mainboard radiator 300, thereby achieving the purpose of quickly cooling the external mainboard 200; when the temperature of the external mainboard 200 is not much different from the temperature of the mainboard radiator 300 or the temperature of the external mainboard 200 is low, at this time, the mainboard radiator 300 does not need to perform excessive heat exchange, and the flow rate of the refrigerant flowing through the mainboard radiator 300 can be reduced.

[0103] By utilizing the temperature control method for the external unit mainboard, the temperature of the external unit mainboard 200 can be adjusted in real time according to its current state, ensuring that the temperature of the external unit mainboard 200 can be relatively stably within a certain range, thereby achieving effective cooling of the external unit mainboard 200, enabling it to work normally, and further ensuring the efficient operation of the corresponding components in the air conditioner outdoor unit.

[0104] Specifically, the temperature T of the mainboard heat sink 300 is 盘 The detection of the temperature T of the external mainboard 200 can be realized by the first temperature sensor. 板 The detection can be achieved by a second temperature sensor.

[0105] During the operation of the air conditioner, the electronic expansion valve 080 is first opened at B 初始 Run, when T 板 -T 盘 >K1 or T 板 ≥T 主板上限 When T is 0, the flow rate of the refrigerant flowing through the mainboard radiator 300 is increased by gradually increasing the opening of the electronic expansion valve 080. Specifically, the electronic expansion valve 080 can be opened at a speed of 5 steps per second to gradually increase the flow rate of the refrigerant flowing through the mainboard radiator 300. 板 -T 盘 <K2 or T 板 ≤T 主板下限 When the electronic expansion valve 080 is opened, the flow of the refrigerant flowing through the mainboard radiator 300 is reduced. Specifically, the electronic expansion valve 080 can be closed at a speed of 5 steps per second to gradually reduce the flow of the refrigerant flowing through the mainboard radiator 300. This method of adjusting the refrigerant flow is sensitive and timely.

[0106] Please continue to refer to Figure 8 The external mainboard temperature control method further includes obtaining a first pressure P of the mainboard radiator 300 when the air conditioner is turned on and operated for a set time. 蒸发 and the second pressure P when condensation is generated with the mainboard heat sink 300 凝露 By comparison, when the refrigerant in the mainboard radiator 300 flows at the third flow rate, the first pressure P of the mainboard radiator 300 when working is determined. 蒸发 Is it less than the second pressure P when condensation occurs? 凝露 If the answer is yes, the flow rate through the motherboard heat sink 300 is increased until the first pressure P 蒸发 Greater than or equal to the second pressure P 凝露 .

[0107] During the operation of the air conditioner, when the water vapor in the electric control box 100 encounters the mainboard radiator 300 with a lower temperature, condensed water will be precipitated on its surface, i.e., condensation. According to the refrigeration principle, within a certain range, the less refrigerant flows through the mainboard radiator 300, the lower the pressure and temperature inside the mainboard radiator 300 will be, and the easier it will be to produce condensation.

[0108] In the mode of reducing the flow rate of the refrigerant flowing through the mainboard radiator 300, the pressure P of the mainboard radiator 300 is 蒸发 Detect and compare it with P 凝露 By comparison, the opening of the electronic expansion valve 080 is adjusted to avoid excessive condensation caused by too little refrigerant flowing through the mainboard radiator 300, thereby ensuring the normal operation of the mainboard radiator 300.

[0109] Specifically, the pressure P of the mainboard heat sink 300 is 蒸发 The detection can be achieved by a pressure sensor installed on the mainboard heat sink 300.

[0110] Preferably, in the mode of reducing the flow rate of the refrigerant flowing through the mainboard radiator 300, when it is necessary to gradually increase the opening of the electronic expansion valve 080, the electronic expansion valve 080 can also be opened at a speed of 5 steps per second.

[0111] It should be noted that, in this embodiment, K1, K2, T 主板上限 , T 主板下限 and P 凝露 All of them are constant values ​​set by the air conditioner manufacturer, wherein the set constant values ​​are different according to the different heat dissipation of the outdoor unit main board 200 of different models of air conditioners.

[0112] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

[0113] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0114] In the above embodiments, the descriptions of directions such as “side” and “bottom” are all based on the drawings.

[0115] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling the temperature of an external machine mainboard, characterized in that: Used to control the temperature of an external mainboard (200) of an air conditioner, the air conditioner comprising a refrigeration circuit and an electric control box assembly (010), the refrigeration circuit comprising a compressor (030), a condenser (060), a throttle (070) and an evaporator (050) arranged in series in sequence; the electric control box assembly comprising an electric control box (100), an external mainboard (200) and a mainboard radiator (300), the electric control box (100) being a sealed box body, the external mainboard (200) and the mainboard radiator (300) being both arranged in the electric control box (100), the mainboard radiator (300) being configured to allow a refrigerant to flow therein, and a medium inlet and a medium outlet of the mainboard radiator (300) being both in communication with the refrigeration circuit; A first temperature sensor is installed on the mainboard radiator (300), and the first temperature sensor is used to detect the temperature of the mainboard radiator (300) when it is in operation; a second temperature sensor is installed on the external mainboard (200), and the second temperature sensor is used to detect the temperature of the external mainboard (200); The external unit mainboard temperature control method comprises the following steps: Acquiring the temperature of the external mainboard (200) and the temperature difference between the external mainboard (200) and the mainboard radiator (300); According to the temperature of the external mainboard (200) and the temperature difference between the external mainboard (200) and the mainboard radiator (300), the flow rate of the refrigerant flowing through the mainboard radiator (300) is controlled: when the temperature difference between the external mainboard (200) and the mainboard radiator (300) is within a preset temperature difference range, and the temperature of the external mainboard (200) is within a preset temperature range, the refrigerant in the mainboard radiator (300) is controlled to flow at a first flow rate; When the temperature difference between the external unit mainboard (200) and the mainboard radiator (300) is greater than the maximum temperature difference in the preset temperature difference range, controlling the refrigerant in the mainboard radiator (300) to flow at a second flow rate; When the temperature difference between the external unit mainboard (200) and the mainboard radiator (300) is less than the minimum temperature difference in the preset temperature difference range, the refrigerant in the mainboard radiator (300) is controlled to flow at a third flow rate; the first flow rate is less than the second flow rate and greater than the third flow rate.

2. The external unit mainboard temperature control method according to claim 1, characterized in that: The controlling the refrigerant in the mainboard radiator (300) to flow at a second flow rate includes increasing the opening of the electronic expansion valve (080); the controlling the refrigerant in the mainboard radiator (300) to flow at a third flow rate includes reducing the opening of the electronic expansion valve (080).

3. The external unit mainboard temperature control method according to claim 1, characterized in that: A pressure sensor is installed on the mainboard radiator (300) of the electric control box assembly (010), and the pressure sensor is used to detect the pressure of the mainboard radiator (300) when it is working; the external mainboard temperature control method also includes the steps of: Acquiring a first pressure when the mainboard radiator (300) is in operation, and comparing it with a second pressure when condensation is generated on the mainboard radiator (300); When the refrigerant in the mainboard radiator (300) flows at the third flow rate, it is determined whether the first pressure is less than the second pressure. If so, the flow rate flowing through the mainboard radiator (300) is increased until the first pressure is greater than or equal to the second pressure.

4. The external unit mainboard temperature control method according to claim 1, characterized in that: The mainboard heat sink (300) is bonded to the external mainboard (200).

5. The external unit mainboard temperature control method according to claim 1, characterized in that: The mainboard heat sink (300) is located below the external mainboard (200).

6. The external unit mainboard temperature control method according to claim 1, characterized in that: The mainboard heat sink (300) is a parallel flow heat sink.

7. The external unit mainboard temperature control method according to claim 1, characterized in that: The inner bottom surface of the electric control box (100) is provided with a guide slope, and the guide slope is configured to guide condensed water to gather toward the bottom of the electric control box (100).

8. The external unit mainboard temperature control method according to claim 1, characterized in that: The bottom wall of the electric control box (100) is provided with a drainage hole (123), and a one-way drainage structure is provided at the drainage hole (123), wherein the one-way drainage structure is configured to only drain condensed water in the electric control box (100).

9. The external unit mainboard temperature control method according to claim 8, characterized in that: The one-way drainage structure comprises an S-shaped water guide channel, wherein the upper wall surface of the S-shaped water guide channel is staggered to form an upper protruding portion (125) and an upper groove portion (127), and the lower wall surface of the S-shaped water guide channel is staggered to form a lower groove portion (124) and a lower protruding portion (126), wherein the lower groove portion (124) is opposite to the upper protruding portion (125), the lower protruding portion (126) is opposite to the upper groove portion (127), and the apex of the lower protruding portion (126) is higher than the bottom end of the upper protruding portion (125).

10. The external unit mainboard temperature control method according to claim 1, characterized in that: The medium inlet is connected to the outlet of the evaporator (050).

11. The external unit mainboard temperature control method according to claim 1, characterized in that: The medium outlet is connected to the inlet of the compressor (030).

12. The external unit mainboard temperature control method according to claim 11, characterized in that: The outlet of the evaporator (050) is connected to the inlet of the compressor (030) via a main pipeline, the main pipeline is provided with a branch pipeline connected to the medium inlet, and the branch pipeline is provided with an electronic expansion valve (080).

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