Outdoor unit

Abstract

This application relates to the field of air conditioning technology, and more particularly to an outdoor unit. The outdoor unit of this application has a cooling channel constructed within the motor housing of the compressor, and a mounting cavity is formed by providing a mounting shell on the motor housing. The inverter includes a first part and a second part. The first part is arranged within the mounting cavity, and heat dissipation is achieved using the cooling channel and the thermal conductivity of the motor housing. The second part is arranged independently of the motor housing. The first part includes an inverter module and a filter capacitor. The inverter module generates a significant amount of heat and is in contact with the motor housing, ensuring effective heat dissipation for the inverter module and improving its heat dissipation efficiency, thus preventing the temperature of the filter capacitor from being affected by insufficient heat dissipation from the inverter module. The filter capacitor generates less heat and is located on the side of the inverter module away from the motor housing. The remaining cooling capacity after heat exchange with the inverter module via the refrigerant channel is used to dissipate heat from the filter capacitor, ensuring its service life and reducing maintenance frequency.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more particularly to an outdoor unit. Background Technology

[0002] Air temperature control equipment typically includes a compressor that compresses low-temperature, low-pressure refrigerant gas into high-temperature, high-pressure gas, creating conditions for condensation and heat release.

[0003] The frequency converter is a core device for controlling and adjusting the compressor speed, regulating the output cooling capacity, and improving the energy efficiency ratio of air conditioners. As the control device of the compressor, the frequency converter generates a lot of heat during operation. Therefore, it is crucial to dissipate heat from the frequency converter to ensure the stable operation of the compressor. Utility Model Content

[0004] This application provides an outdoor unit that utilizes the compressor motor housing to dissipate heat from a portion of the inverter structure.

[0005] This application provides an outdoor unit, which includes:

[0006] A compressor, configured to compress refrigerant gas; the compressor includes:

[0007] The motor housing has an internal structure that forms cooling channels;

[0008] The mounting housing is fixed to the outside of the housing and forms a mounting cavity;

[0009] A frequency converter is configured to control the speed of the compressor by frequency conversion; the frequency converter includes:

[0010] The first part includes:

[0011] The inverter module is installed inside the mounting cavity and contacts the motor housing;

[0012] A filter capacitor is installed inside the mounting cavity and located on the side of the inverter module away from the motor housing;

[0013] The second part is set independently of the motor housing.

[0014] The outdoor unit of this application embodiment has a cooling channel constructed inside the compressor motor housing to dissipate heat from the compressor motor. A mounting cavity is formed by providing a mounting shell on the motor housing. The inverter includes a first part and a second part. The first part is arranged within the mounting cavity, and heat is dissipated using the cooling channel and the thermal conductivity of the motor housing. The second part is arranged independently of the motor housing, eliminating the need for overly complex and redundant structures on the motor housing to install it. The first part includes an inverter module and a filter capacitor. The inverter module generates a significant amount of heat and is in contact with the motor housing, ensuring effective heat dissipation and improving heat dissipation efficiency, preventing the filter capacitor's temperature from being affected by insufficient heat dissipation from the inverter module. The filter capacitor generates less heat and is located inside the mounting shell on the side of the inverter module away from the motor housing. The remaining cooling capacity after heat exchange with the inverter module via the refrigerant channel is used to dissipate heat from the filter capacitor, ensuring its lifespan and reducing maintenance frequency. Furthermore, the side of the inverter module away from the motor housing has ample space, facilitating the placement of the larger filter capacitor.

[0015] In some embodiments of this application, the mounting housing includes a base plate having a first surface and a second surface opposite to each other. The first surface is an arc-shaped surface that is attached to and fixed to the motor housing. The second surface is a flat surface to support the inverter module.

[0016] The mounting housing forms the bottom wall of the mounting cavity by setting a base plate. One side of the base plate is curved, matching the shape of the outer surface of the motor housing, and is fitted and fixed, so that heat can be transferred to the cooling channel through the base plate and the motor housing by heat conduction, which helps to improve heat dissipation efficiency. The other side of the base plate is flat, which helps to stably and reliably support the inverter module, making the installation of the inverter module more stable.

[0017] In some embodiments of this application, thermally conductive adhesive is provided between the base plate and the inverter module.

[0018] On the one hand, thermally conductive adhesive can improve the stability of the connection between the inverter module and the base plate. On the other hand, thermally conductive adhesive can fill the uneven gaps between the base plate and the inverter module, increasing the effective contact area, thereby helping to improve heat transfer efficiency and thus heat dissipation efficiency.

[0019] In some embodiments of this application, a partition is provided inside the mounting housing to divide the mounting cavity into a first cavity and a second cavity, wherein the first cavity is located below the second cavity;

[0020] The inverter module is installed in the first cavity, and the filter capacitor is installed in the second cavity.

[0021] In this embodiment, a partition is provided inside the mounting housing to divide the mounting cavity into a first cavity and a second cavity, thereby allowing the inverter module and the filter capacitor to be installed in different cavities. The partition provides support for the filter capacitor, making the first part of the inverter structure more stable, and also creates spatial isolation between the filter capacitor and the inverter module, reducing their mutual interference.

[0022] In some embodiments of this application, a frequency converter output port is provided on one side of the mounting housing, and a motor wiring port is provided on the motor housing. The motor wiring port and the frequency converter output port are located on the same side of the motor housing.

[0023] This configuration brings the motor wiring port and the inverter output port closer together, which helps to shorten the electrical connection cable between the motor wiring port and the inverter output port, making the connection more convenient and improving the transmission quality of control signals.

[0024] In some embodiments of this application, the motor wiring port and the inverter output port are electrically connected via a cable;

[0025] A junction box is fixed to the outside of the motor housing, and the junction box covers the outside of the cable.

[0026] This application embodiment utilizes a junction box to shield and protect the cable connecting the motor wiring port and the inverter output port, thereby improving the safety of the outdoor unit.

[0027] In some embodiments of this application, the motor housing is provided with an inlet and a first outlet, and the inlet and the first outlet are respectively connected to the two ends of the cooling channel along the axial direction;

[0028] The inlet is used to connect to the condenser, and the first outlet is used to connect to the evaporator.

[0029] Since the evaporator is located on the suction side of the compressor and the condenser is located on the discharge side of the compressor, the refrigerant pressure in the condenser is greater than that in the evaporator, resulting in a pressure difference between the inlet and the first outlet. This pressure difference causes the refrigerant to continuously enter the cooling channel from the inlet and flow out through the first outlet, thereby cooling the motor and keeping the motor casing at a low temperature. No additional refrigerant driver is required, which simplifies the structure.

[0030] In some embodiments of this application, the mounting housing is located between the inlet and the first outlet.

[0031] In this way, when the refrigerant flows through the cooling channel, it can dissipate heat to the mounting shell and its internal structure through the motor housing, which helps to improve the heat dissipation efficiency of the mounting shell and its internal structure.

[0032] In some embodiments of this application, the mounting housing is a metal housing.

[0033] The metal casing has good thermal conductivity, which facilitates the transfer of heat from inside the casing to the motor housing.

[0034] In some embodiments of this application, the cooling channel extends spirally along the axial direction of the motor housing.

[0035] The spiral cooling channel helps to extend the flow path of the coolant, increase the contact area between the motor housing and stator and the coolant, and thus help to improve the cooling effect.

[0036] In some embodiments of this application, the second part includes a frequency converter cabinet and electrical components installed inside the frequency converter cabinet;

[0037] The outdoor unit also includes a cooling fan, which is configured to drive cooling airflow across the surface of the electrical components.

[0038] In this embodiment of the inverter, the second part is set independently of the motor housing and uses air cooling for heat dissipation, which is simple and reliable. Moreover, since the inverter module, which is the main heat source of the inverter, is located above the motor housing, the heat dissipation requirements of the second part are relatively reduced, and air cooling can meet the heat dissipation requirements, which helps to simplify the structure and reduce the cost of the outdoor unit. Attached Figure Description

[0039] Figure 1 A schematic diagram of the refrigeration system and refrigerant flow direction provided for some embodiments of this application;

[0040] Figure 2 This is a schematic diagram of the structure of the motor portion provided in some embodiments of this application;

[0041] Figure 3 Cross-sectional views of the motor portion provided in some embodiments of this application;

[0042] Figure 4 This is a schematic diagram of the structure of the motor portion provided in some embodiments of this application;

[0043] Figure 5 Front view of the motor portion provided in some embodiments of this application;

[0044] Figure 6 Schematic diagrams of the compressor and frequency converter provided in some embodiments of this application;

[0045] Figure 7 This application provides schematic diagrams of the structure of a compressor and a portion of a frequency converter, as shown in some embodiments.

[0046] Figure 8 This is a schematic diagram of the structure of an inverter module provided in some embodiments of this application;

[0047] Figure 9 Here are some schematic diagrams of the structure of the filter capacitor provided in some embodiments of this application;

[0048] Figure 10 This is a cross-sectional schematic diagram of the motor housing and mounting housing provided in some embodiments of this application.

[0049] Explanation of reference numerals in the attached figures:

[0050] 10: Compressor; 11: Compression section; 20: Condenser; 30: Evaporator; 40: Throttling element;

[0051] 100: Motor section; 110: Motor housing; 111: Inlet; 112: First outlet; 113: First cooling chamber; 114: Second cooling chamber; 115: Second outlet; 116: Motor wiring port; 120: Cooling channel; 121: Spiral sleeve; 130: Rotor; 140: Stator; 150: Bearing structure;

[0052] 200: Mounting housing; 210: Mounting cavity; 211: First cavity; 212: Second cavity; 220: Base plate; 230: Side plate; 250: Top plate; 260: Partition; 270: Inverter output port; 280: Thermal adhesive;

[0053] 300: Frequency converter; 310: Part 1; 311: Inverter module; 3111: Insulated gate bipolar transistor; 3112: Input terminal; 3113: Output terminal; 312: Filter capacitor; 3121: DC busbar assembly; 3122: Capacitor cover; 320: Part 2;

[0054] 400: Junction box;

[0055] 510: First control valve; 520: Second control valve. Detailed Implementation

[0056] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0057] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0058] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0059] Chillers are the core cooling source equipment in central air conditioning systems, primarily used to produce low-temperature chilled water, such as 7°C supply water and 12°C return water. The cooling capacity is delivered to terminal devices, such as fan coil units and air handling units, through water circulation. A chiller unit may include an evaporator, compressor, condenser, and a throttling device. The refrigerant circulates in the circulation path formed by the evaporator, compressor, condenser, and throttling device, exchanging heat with the water in the evaporator's water path to lower its temperature. The chilled water is then pumped to the terminal devices to regulate the air temperature.

[0060] Oil-free operation is an inevitable trend for centrifugal chillers. Magnetic levitation chillers utilize magnetic bearings to levitate the rotor, eliminating mechanical friction and resulting in a highly energy-efficient, completely oil-free system. Magnetic levitation compressors typically use permanent magnet synchronous motors as the drive core, replacing electrically excited windings with permanent magnets, thus eliminating the need for external excitation current. To improve the chiller's energy efficiency ratio, a frequency converter must be installed to regulate the motor's speed, enabling stepless adjustment of the exhaust volume and providing cooling capacity that matches the environment, achieving an IPLV of 12 or higher.

[0061] In related technologies, the inverter and compressor of magnetic levitation chillers above 200kW are two completely separate structures, and both require independent air-cooled or liquid-cooled heat exchange schemes, resulting in a large overall air conditioning unit size. Here, 200kW refers to the rated cooling capacity of the compressor.

[0062] In some outdoor units, the inverter and compressor are integrated, with the inverter cooled by a heat exchange channel. However, this approach is typically used with small-displacement scroll compressors, where the inverter's power components are highly integrated, resulting in a relatively small overall size and ample space within the compressor for the inverter.

[0063] However, for large magnetic levitation compressors with a power output of 200kW or more, the power components of the inverter are large, while the available space on the compressor is limited, making it impossible to achieve an integrated design of the compressor and the inverter.

[0064] In view of this, the researchers of this application considered to arrange part of the inverter's structure on the compressor, while the rest of the structure is still integrated into the electrical box.

[0065] A frequency converter includes a rectifier module, an inverter module, and a filter capacitor module, all of which generate significant losses during operation. The inverter module, in particular, generates a large amount of heat. The Insulated-Gate Bipolar Transistor (IGBT) in the inverter module is the inverter bridge arm. The conduction and switching losses of the IGBT during switching processes generate substantial heat, potentially reaching several kilowatts. Since the junction temperature of the IGBT is around 175°C, excessively high operating temperatures can cause the device to burn out. Therefore, the inverter module is mounted on the compressor housing, utilizing the compressor's coolant for cooling.

[0066] As a device that converts AC to DC, the rectifier module generates a significant amount of heat during operation, which can be dissipated using the coolant within the compressor. However, there is insufficient space for the rectifier module to be in direct contact with the compressor housing. Placing the rectifier module above the inverter module for indirect heat dissipation would be ineffective. Therefore, the rectifier module is housed within the inverter's electrical box for proper cooling.

[0067] The inverter's filter capacitors serve to smooth voltage ripple after rectification and act as energy storage buffers. These capacitors also generate heat during operation, and their lifespan is halved for every 10°C increase in temperature. Therefore, heat dissipation is crucial for the filter capacitors. Considering that the heat generated by the filter capacitors is relatively small compared to the rectifier module, and their size is relatively large, stacking the filter capacitors on top of the inverter module not only dissipates heat from the capacitors but also reduces the size of the inverter's electrical box, allowing for more flexible installation.

[0068] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0069] First, it should be noted that the outdoor unit in this application embodiment can be a household air conditioner outdoor unit, which may include an outdoor heat exchanger, compressor, expansion valve, etc., while the indoor heat exchanger is located indoors. The outdoor unit in this application embodiment can also be a central air conditioning unit, an industrial cooling air conditioning unit, etc., and can also be called a chiller unit. It produces chilled water through compression refrigeration, and the chilled water is transported to terminal equipment, such as fan coil units and air handling units, through a chilled water system to achieve indoor cooling.

[0070] Combination Figure 1In some embodiments, the outdoor unit may include a compressor 10, a condenser 20, an evaporator 30, and a throttling element 40. The exhaust port of the compressor 10 is connected to the condenser 20 via a third pipe, the condenser 20 is connected to the evaporator 30 via a fourth pipe, and the evaporator 30 is connected to the intake port of the compressor 10 via a fifth pipe. The throttling element 40 is installed on the fourth pipe.

[0071] Compressor 10 compresses the refrigerant into a high-temperature, high-pressure gas, which enters the condenser 20 through the third pipe. In the condenser 20, the gas condenses and liquefies into a high-pressure liquid, while its temperature decreases. Then, it enters the throttling element 40 through the fourth pipe, forming a medium-pressure gas-liquid two-phase mixture of refrigerant. Next, it enters the evaporator 30, where the low-pressure, low-temperature liquid refrigerant absorbs heat from the chilled water pipe and evaporates to form a low-pressure gaseous refrigerant. Finally, it enters the suction port of compressor 10 through the fifth pipe. The temperature in the chilled water pipe is cooled by the evaporator 30 to form chilled water, which is then circulated to terminal equipment such as fan coil units to achieve cooling.

[0072] In some embodiments, the outdoor unit may further include an economizer, which may be disposed on the pipeline between the throttling element 40 and the evaporator 30, and the economizer is also connected to the suction port of the compressor 10. The economizer can play a secondary throttling role, which helps to improve the cooling efficiency.

[0073] Continue to refer to Figure 1 The compressor 10 is configured to compress refrigerant gas. In this embodiment, the compressor 10 may be a magnetic levitation compressor 10, an air flotation compressor 10, a liquid flotation compressor 10, etc. The compressor 10 may include a motor section 100 and a compression section 11, with the motor section 100 driving the compression section 11 to compress the refrigerant gas.

[0074] The compression section 11 can be a piston type, where the piston reciprocates within a cylinder, controlling the refrigerant gas flow through intake and exhaust valves. Alternatively, the compression section 11 can be a scroll type, where a fixed scroll meshes with a moving scroll to form a gradually shrinking gas chamber that compresses the gas. The compression section 11 can also be a screw type, where male and female rotors 130 mesh and rotate to continuously compress the gas. No specific restrictions are placed on the specific structure of the compression section 11.

[0075] Combination Figure 2 and Figure 3 The motor section 100 includes a motor housing 110, which has a first end and a second end opposite each other along the axial direction. The housing is cylindrical to facilitate the installation of internal structures. Figure 3 In the orientation shown, the motor housing 110 has a first end and a second end along the X-axis direction.

[0076] The motor housing 110 has a cooling channel 120 internally configured to dissipate heat and cool down the motor housing 110 and its internal structure.

[0077] The motor section 100 also includes a rotor 130, which is coaxially arranged within the motor housing 110 and rotates relative to the motor housing 110. This can be understood as the rotor 130 being coaxially arranged with the motor housing 110. The two ends of the rotor 130 along the axial direction are respectively mounted to the motor housing 110 via bearing structures 150. The bearing structure 150 can be an oil-free bearing, such as a magnetic levitation bearing or an air bearing; the bearing structure 150 can also be a sliding bearing, a thrust bearing, or other bearing that uses lubrication. No specific limitations are placed on the specific structure of the bearing structure 150 or similar designs.

[0078] The motor section 100 may further include a stator 140, which is fixed inside the motor housing 110, allowing the rotor 130 to rotate relative to the stator 140. The stator 140 may be fitted over the rotor 130, with a gap between them to allow coolant flow. The stator 140 and rotor 130 convert electrical energy into mechanical energy through electromagnetic interaction, driving the compression section 11 to compress the gas. A cooling channel 120 is located between the stator 140 and the motor housing 110.

[0079] In some embodiments, the cooling channel 120 is spiral-shaped. The spiral-shaped cooling channel 120 extends spirally from the first end of the motor housing 110 toward the second end along the axial direction of the motor housing 110. The spiral-shaped cooling channel 120 facilitates the extension of the coolant flow path, increases the contact area between the motor housing 110 and the stator 140 and the coolant, and thus helps to improve the cooling effect.

[0080] In some embodiments, a spiral groove is formed on the inner wall of the motor housing 110, and the stator 140 and the motor housing 110 enclose a spiral cooling channel 120. This results in a simple structure that is easy to implement.

[0081] In other embodiments, the motor portion 100 further includes a spiral sleeve 121. A spiral groove is formed on the outer side of the spiral sleeve 121. The spiral sleeve 121 is located inside the motor housing 110, and the outer side of the spiral sleeve 121 and the motor housing 110 enclose each other to form a spiral cooling channel 120. Sealing rings are provided between the two ends of the spiral sleeve 121 and the housing. The sealing rings are closer to the ends of the spiral sleeve 121 than the ends of the spiral grooves to ensure the sealing of the spiral cooling channel 120.

[0082] The spiral sleeve 121 is arranged coaxially with the motor housing 110, and the stator 140 is fixed inside the spiral sleeve 121.

[0083] The spiral sleeve 121 can be a metal part with good thermal conductivity, facilitating heat transfer from the stator 140 to the spiral sleeve 121. For example, the spiral sleeve 121 can be an aluminum alloy.

[0084] The sealing ring can be an O-ring. The spiral sleeve 121 is fixed inside the housing by the interference fit between the sealing ring and the motor housing 110.

[0085] In this embodiment, the motor housing 110 is provided with an inlet 111 and a first outlet 112, which are respectively connected to the two ends of the cooling channel 120 along the axial direction. The inlet 111 is used to introduce coolant, and the first outlet 112 is used to discharge coolant. Thus, the coolant enters the first end of the cooling channel 120 through the inlet 111, flows along the cooling channel 120 to the second end, and then flows out through the first outlet 112. In this process, the coolant carries away the heat from the stator 140 and the motor housing 110, thereby achieving heat dissipation and cooling of the motor part 100.

[0086] In this embodiment, the refrigerant of the outdoor unit acts as a coolant to cool the motor section 100. Wherein, combined with Figure 1 The inlet 111 is used to connect to the condenser 20, and the first outlet 112 is used to connect to the evaporator 30. Specifically, the inlet 111 is connected to the condenser 20 through a first pipe, and the first outlet 112 is connected to the evaporator 30 through a second pipe.

[0087] The high-pressure, low-temperature liquid refrigerant in the condenser 20 enters the inlet 111 through the first pipe and then enters the cooling channel 120. The refrigerant cools the motor part 100 in the cooling channel 120 and then flows out through the first outlet 112 and enters the second pipe through the first outlet 112, flowing back to the evaporator 30.

[0088] Since the evaporator 30 is located on the suction port side of the compressor 10 and the condenser 20 is located on the discharge port side of the compressor 10, the refrigerant pressure in the condenser 20 is greater than the refrigerant pressure in the evaporator 30, resulting in a pressure difference between the inlet 111 and the first outlet 112. Consequently, the refrigerant continuously enters the cooling channel 120 from the inlet 111 under the action of the pressure difference and flows out through the first outlet 112, thereby cooling the motor section 100 and keeping the motor housing 110 at a low temperature. No additional refrigerant driver is required, which simplifies the structure.

[0089] In some embodiments, a first control valve 510 is provided on the first pipeline and a second control valve 520 is provided on the second pipeline. The opening degree of the first control valve 510 and the second control valve 520 can be determined according to the temperature of the motor housing 110, the refrigerant pressure in the cooling channel 120, etc., so that the refrigerant in the cooling channel 120 matches the cooling requirements of the motor part 100. This can avoid overcooling, which can easily cause condensation on the outer surface of the motor housing 110, and also avoid insufficient cooling, which can lead to a high temperature of the motor part 100.

[0090] Continue to refer to Figure 3 In some embodiments of this application, a first cooling chamber 113 and a second cooling chamber 114 may also be formed inside the motor housing 110. The first cooling chamber 113 and the second cooling chamber 114 are located on both sides of the stator 140 and the rotor 130 along the axial direction, respectively, and the first cooling chamber 113 and the second cooling chamber 114 are connected through the gap between the stator 140 and the rotor 130.

[0091] Refrigerant is introduced into at least one of the first cooling chamber 113 and the second cooling chamber 114 to further cool the motor section 100. Exemplarily, a nozzle is provided in the first cooling chamber 113, which can communicate with the condenser 20 to spray refrigerant into the first cooling chamber 113; and the refrigerant in the first cooling chamber 113 can enter the second cooling chamber 114 through the gap between the stator 140 and the rotor 130, improving the overall cooling of the motor section 100.

[0092] Continue to refer to Figure 2 A second outlet 115 is provided on the bottom side of the motor housing 110. The second outlet 115 is connected to the first cooling chamber 113 and the second cooling chamber 114 respectively, so as to discharge the coolant in the first cooling chamber 113 and the second cooling chamber 114. Furthermore, the second outlet 115 is located on the bottom side of the housing, which helps to drain the coolant in the first cooling chamber 113 and the second cooling chamber 114 as completely as possible, thus improving the cooling effect.

[0093] Reference Figure 1 and Figure 2 In some embodiments of this application, the compressor 10 may further include a mounting housing 200, which is fixed to the outside of the motor housing 110, and the mounting housing 200 is also configured to form a mounting cavity 210.

[0094] For example, the mounting housing 200 may include two parts that are detachably connected to facilitate the installation of devices inside. One part is fixedly connected to the motor housing 110, for example, by welding the other part to the motor housing 110, providing a stable and reliable connection that facilitates heat transfer.

[0095] The mounting housing 200 is a metal housing with good thermal conductivity, facilitating the transfer of heat from inside the mounting housing 200 to the motor housing 110. For example, the mounting housing 200 is an aluminum housing.

[0096] Reference Figure 4 and Figure 5 In some embodiments of this application, the mounting housing 200 is located between the inlet 111 and the first outlet 112, such that the mounting housing 200 corresponds to the cooling channel 120. Thus, when the refrigerant flows through the cooling channel 120, heat can be dissipated from the mounting housing 200 and its internal structure through the motor housing 110, which helps to improve the heat dissipation efficiency of the mounting housing 200 and its internal structure.

[0097] like Figure 6 As shown, the outdoor unit in this embodiment of the application may also include a frequency converter 300, which is configured to control the speed of the compressor 10 by frequency conversion.

[0098] In this embodiment, the power of the motor section 100 is above 200KW, which is relatively large. The power components of its frequency converter 300 are also relatively large, which is insufficient to install the entire frequency converter 300 on the motor housing 110.

[0099] The frequency converter 300 includes a first part 310 and a second part 320. The first part 310 is located on the motor housing 110, and the cooling capacity of the cooling channel 120 is used to dissipate heat from the first part 310 through the motor housing 110. The second part 320 is set independently of the motor housing 110 and has its own heat dissipation structure. The heat dissipation structure can be cooled by air, liquid cooling, etc.

[0100] In some embodiments of this application, reference is made to Figure 7 and Figure 8 The first part 310 includes an inverter module 311, wherein the inverter module 311 is installed in the mounting cavity 210 and contacts the motor housing 110.

[0101] The motor housing 110 is a metal housing, which can provide sufficient strength to support the internal structure and also utilize the thermal conductivity of metal to dissipate heat from the inverter module 311 inside the mounting housing 200.

[0102] The inverter module 311 can directly contact the motor housing 110, so that the heat of the inverter module 311 can be directly transferred to the refrigerant in the cooling channel 120 through the motor housing 110, thereby playing a role in heat dissipation.

[0103] Typically, the outer surface of the motor housing 110 is a curved surface, which is not conducive to the direct installation of the inverter module 311. Therefore, in this embodiment, the inverter module 311 is indirectly in contact with the motor housing 110 through the bottom wall of the mounting shell 200. The bottom wall of the mounting shell 200 provides stable support for the inverter module 311, which can ensure the structural stability of the first part 310 of the frequency converter 300.

[0104] like Figure 8 As shown, the inverter module 311 includes an insulated-gate bipolar transistor 3111 (hereinafter referred to as IGBT), which can be fixed to the mounting housing 200 with screws. Both the input terminal 3112 and the output terminal 3113 of the IGBT can be in the form of a cable adapter copper busbar. The input terminal 3112 can be located at the input copper busbar at the top of the IGBT, and the output terminal 3113 can be located at the output copper busbar at the bottom of the IGBT.

[0105] The first part 310 may also include a filter capacitor 312, which is installed inside the mounting cavity 210 and located on the side of the inverter module 311 away from the motor housing 110. Compared to the inverter module 311, the filter capacitor 312 has lower heat dissipation requirements. Therefore, by installing the filter capacitor 312 on the side of the inverter module 311 away from the motor housing 110, the remaining cooling capacity after the inverter module 311 has cooled down can be used to dissipate heat from the filter capacitor 312, thus meeting the heat dissipation requirements. Moreover, since the filter capacitor 312 is relatively large, integrating it into the mounting cavity 210 helps to reduce the size of the second part 320 of the frequency converter 300 and improves the compactness of the compressor 10 and the frequency converter 300 structure.

[0106] The filter capacitor 312 may include an electrolytic capacitor, which smooths the voltage through charging and discharging to suppress voltage ripple after rectification and provide a stable DC bus voltage for the IGBT. During the operation of the inverter 300, the electrolytic capacitor heats up; for every 10°C increase in temperature, the capacitor's lifespan is halved. In this embodiment, the electrolytic capacitor is arranged in the mounting cavity 210, and the remaining cooling energy after heat exchange with the inverter module 311 is used to dissipate heat from the electrolytic capacitor, ensuring its lifespan and reducing maintenance frequency.

[0107] Of course, the filter capacitor 312 may also include other capacitors, such as film capacitors for high-frequency filtering and peak absorption; and ceramic capacitors for ultra-high-frequency filtering and decoupling.

[0108] The filter capacitor 312 may also include a DC bus assembly 3121, which is used for connection to the output of the rectifier module. Figure 7 and Figure 9 The electrolytic capacitor is locked and fixed to the mounting shell 200 using the capacitor cover 3122.

[0109] In some embodiments, the mounting housing 200 is located at the top of the motor housing 110 along the height direction perpendicular to the horizontal plane. This avoids electrical and piping connections at other locations on the motor housing 110 and also utilizes the space above the motor housing 110. The inverter module 311 generates a large amount of heat and is located close to the motor housing 110, where it is cooled by the refrigerant in the cooling channel 120. The filter capacitor 312 generates relatively little heat and is larger in size, so it is located at the top of the inverter module 311 and is cooled indirectly by the refrigerant in the cooling channel 120. This arrangement ensures effective heat dissipation and also utilizes the ample space above the motor housing 110.

[0110] In some embodiments of this application, combined with Figure 6 Part 2, 320, includes the frequency converter cabinet and the electrical components installed within it. The electrical components within the frequency converter cabinet include rectifier modules, circuit breakers, reactors, etc.

[0111] The outdoor unit also includes a cooling fan, which is designed to drive cooling airflow through the surface of electrical components.

[0112] Among them, the cooling fan can drive outdoor air to flow over the surface of the electrical components to dissipate heat from the electrical components.

[0113] Alternatively, the outdoor unit may also be equipped with a cold air source, such as using the evaporator 30 for heat exchange and cooling to generate a cold air source. The cooling fan drives the cold air source to flow over the surface of the electrical components to dissipate heat from them.

[0114] In this embodiment of the inverter 300, the second part 320 is set independently of the motor housing 110 and uses air cooling for heat dissipation, which is simple and reliable. Moreover, since the inverter module 311, which is the main heat source of the inverter 300, is located above the motor housing 110, the heat dissipation requirements of the second part 320 are relatively reduced, and air cooling can meet the heat dissipation requirements, which helps to simplify the structure and reduce the cost of the outdoor unit.

[0115] In this embodiment of the outdoor unit, a cooling channel 120 is constructed within the motor housing 110 of the compressor 10 to dissipate heat from the motor portion 100 of the compressor 10. A mounting cavity 210 is formed by providing a mounting shell 200 on the motor housing 110. The inverter 300 includes a first portion 310 and a second portion 320. The first portion 310 is disposed within the mounting cavity 210, and heat is dissipated using the thermal conductivity of the cooling channel 120 and the motor housing 110. The second portion 320 is disposed independently of the motor housing 110, eliminating the need for overly complex and redundant structures on the motor housing 110 to mount the second portion 320. The first part 310 includes an inverter module 311 and a filter capacitor 312. The inverter module 311 generates a significant amount of heat and is in contact with the motor housing 110. This ensures effective heat dissipation for the inverter module 311 and improves its heat dissipation efficiency, preventing the temperature of the filter capacitor 312 from being affected by insufficient heat dissipation from the inverter module 311. The filter capacitor 312 generates less heat and is housed within the mounting housing 200, located on the side of the inverter module 311 away from the motor housing 110. The remaining cooling energy after heat exchange with the inverter module 311 is dissipated through the refrigerant flow channel, thus ensuring the lifespan of the filter capacitor 312 and reducing maintenance frequency. Furthermore, the side of the inverter module 311 away from the motor housing 110 has ample space, which is conducive to accommodating the relatively large filter capacitor 312.

[0116] The outdoor unit of this application embodiment, based on the cooling of the motor housing 110, also dissipates heat to the inverter module 311 and the filter capacitor 312. This allows for the reuse of the cooling capacity of the motor housing 110, reducing energy waste; and it compresses the volume of the inverter 300 and the compressor 10 as much as possible, improving the miniaturization and integration of the outdoor unit.

[0117] Reference Figure 10 In some embodiments of this application, the mounting housing 200 includes a base plate 220, which has a first surface and a second surface. The first surface is an arc-shaped surface that is fitted and fixed to the motor housing 110; the second surface is a flat surface to support the inverter module 311. When the mounting housing 200 is fixed to the top of the motor housing 110, the bottom surface of the base plate 220 forms the first surface, and the top surface of the base plate 220 forms the second surface.

[0118] The mounting housing 200 forms the bottom wall of the mounting cavity 210 by setting the base plate 220. One side of the base plate 220 is an arc-shaped surface, which matches the shape of the outer surface of the motor housing 110, and fits and fixes it in place. This allows heat to be transferred to the cooling channel 120 through the base plate 220 and the motor housing 110 by heat conduction, which helps to improve heat dissipation efficiency. The other side of the base plate 220 is a flat surface, which helps to stably and reliably support the inverter module 311, making the installation of the inverter module 311 more stable.

[0119] In some embodiments, a thermally conductive adhesive 280, such as thermally conductive silicone grease, is provided between the base plate portion 220 and the inverter module 311. Thus, on the one hand, the thermally conductive adhesive 280 can improve the stability of the connection between the inverter module 311 and the base plate portion 220; on the other hand, the thermally conductive adhesive 280 can fill the uneven gaps between the base plate portion 220 and the inverter module 311, increasing the effective contact area, thereby helping to improve heat transfer efficiency and thus heat dissipation efficiency.

[0120] The mounting housing 200 may further include a top plate portion 250 and a plurality of side plate portions 230, the top plate portion 250 being spaced apart above the bottom plate portion 220. The plurality of side plate portions 230 are sequentially connected end-to-end to form a ring structure, the ring structure connecting the top plate portion 250 and the bottom plate portion 220. For example, four side plate portions 230 are provided, the four side plates enclosing a ring-shaped rectangular frame, the structure being regular.

[0121] At least one of the top plate portion 250 and the side plate portion 230 can be detachably connected to other structures of the mounting housing 200, facilitating the installation and maintenance of the internal inverter module 311 and filter capacitor 312.

[0122] Continue to refer to Figure 10 In some embodiments of this application, a partition 260 is provided inside the mounting shell 200 to divide the mounting cavity 210 into a first cavity 211 and a second cavity 212, with the first cavity 211 located below the second cavity 212.

[0123] The inverter module 311 is installed in the first cavity 211, and the filter capacitor 312 is installed in the second cavity 212.

[0124] The partition 260 can be a metal plate, which facilitates the conduction of heat from the filter capacitor 312 toward the first cavity 211.

[0125] In this embodiment, by providing a partition 260 within the mounting housing 200, the mounting cavity 210 is divided into a first cavity 211 and a second cavity 212, thereby allowing the inverter module 311 and the filter capacitor 312 to be installed in different cavities. The partition 260 provides support for the filter capacitor 312, making the first part 310 of the inverter 300 more stable, and also creates spatial isolation between the filter capacitor 312 and the inverter module 311, reducing their mutual interference.

[0126] In related technologies, since the inverter 300 and the compressor 10 are two completely independent structures, and since the inverter 300 has a separate heat dissipation structure, the inverter 300 is relatively large. Due to depreciation, the output of the inverter 300 and the motor wiring terminals are located on two separate components, and the connecting cables are relatively long.

[0127] Combination Figure 5 In some embodiments of this application, a frequency converter output port 270 is provided on one side of the mounting housing 200, and a motor wiring port 116 is provided on the motor housing 110. The motor wiring port 116 and the frequency converter output port 270 are located on the same side of the motor housing 110.

[0128] For example, the inverter output port 270 is located at the bottom of the mounting housing 200, and the motor wiring port 116 is located below the inverter output port 270.

[0129] This configuration brings the distance between the motor wiring port 116 and the inverter output port 270 closer, which helps to shorten the electrical connection cable between the motor wiring port 116 and the inverter output port 270, making the connection more convenient and improving the transmission quality of control signals.

[0130] Reference Figure 7 In some implementations of this application, the motor wiring port 116 and the inverter output port 270 are electrically connected via a cable;

[0131] A junction box 400 is fixed to the outside of the motor housing 110, and the junction box 400 covers the outside of the cable.

[0132] Junction box 400 may be located on one side of mounting housing 200. Junction box 400 is connected to mounting housing 200, and / or, junction box 400 is connected to motor housing 110.

[0133] This application embodiment utilizes a junction box 400 to shield and protect the cable electrically connected between the motor wiring port 116 and the inverter output port 270, which helps to improve the safety of the outdoor unit.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0135] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. An outdoor unit, characterized in that, include: The compressor (10) is configured to compress refrigerant gas; The compressor (10) includes: A motor housing (110) having a cooling channel (120) formed inside the motor housing (110); Mounting housing (200) is fixed to the outside of the housing and is configured to form mounting cavity (210); A frequency converter (300) is configured to control the speed of the compressor (10) by frequency conversion; the frequency converter (300) includes: The first part (310) includes: An inverter module (311) is installed in the mounting cavity (210) and contacts the motor housing (110); A filter capacitor (312) is installed in the mounting cavity (210) and located on the side of the inverter module (311) away from the motor housing (110); The second part (320) is provided independently of the motor housing (110).

2. The outdoor unit according to claim 1, characterized in that, The mounting housing (200) includes a base plate (220) having a first surface and a second surface opposite to each other. The first surface is an arc-shaped surface that is attached to and fixed to the motor housing (110). The second surface is a flat surface that supports the inverter module (311).

3. The outdoor unit according to claim 2, characterized in that, Thermally conductive adhesive (280) is provided between the base plate (220) and the inverter module (311).

4. The outdoor unit according to claim 1, characterized in that, The mounting housing (200) is provided with a partition (260) to divide the mounting cavity (210) into a first cavity (211) and a second cavity (212), wherein the first cavity (211) is located below the second cavity (212); The inverter module (311) is installed in the first cavity (211), and the filter capacitor (312) is installed in the second cavity (212).

5. The outdoor unit according to claim 1, characterized in that, A frequency converter output port (270) is provided on one side of the mounting housing (200), and a motor wiring port (116) is provided on the motor housing (110). The motor wiring port (116) and the frequency converter output port (270) are located on the same side of the motor housing (110).

6. The outdoor unit according to claim 5, characterized in that, The motor wiring port (116) and the inverter output port (270) are electrically connected by a cable; A junction box (400) is fixed to the outside of the motor housing (110), and the junction box (400) covers the outside of the cable.

7. The outdoor unit according to any one of claims 1-6, characterized in that, The motor housing (110) is provided with an inlet (111) and a first outlet (112), and the inlet (111) and the first outlet (112) are respectively connected to the two ends of the cooling channel (120) along the axial direction; The inlet (111) is used to communicate with the condenser (20), and the first outlet (112) is used to communicate with the evaporator (30).

8. The outdoor unit according to claim 7, characterized in that, The mounting housing (200) is located between the inlet (111) and the first outlet (112).

9. The outdoor unit according to any one of claims 1-6, characterized in that, The mounting housing (200) is a metal housing; and / or, the cooling channel (120) extends spirally along the axial direction of the motor housing (110).

10. The outdoor unit according to any one of claims 1-6, characterized in that, The second part (320) includes a frequency converter cabinet and electrical components installed in the frequency converter cabinet; The outdoor unit also includes a cooling fan configured to drive cooling airflow across the surface of the electrical components.

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