Outdoor unit and water source multi-split system

Abstract

The utility model discloses an outdoor unit and water source multi-connected unit, outdoor unit includes the casing and electric appliance box, the inside formation of casing has installation cavity, is provided with first air inlet and first air outlet on the casing, electric appliance box includes electric appliance box body and heat dissipation air duct, the inside of electric appliance box body is provided with the fan, and the lateral wall of electric appliance box body is provided with second air inlet, heat dissipation air duct sets up at the bottom of electric appliance box body, and the top side of heat dissipation air duct is communicated with the inner chamber of electric appliance box body, and heat dissipation air duct has second air outlet, and second air outlet is towards first air outlet, the scheme is improved to electric appliance box through the structure, improves the heat dissipation effect of electric appliance box.

Description

Technical Field

[0001] This utility model relates to the field of air conditioner technology, and in particular to an outdoor unit and a water source multi-split air conditioner. Background Technology

[0002] A water-source multi-split air conditioning system is a type of central air conditioning system, comprising an outdoor unit, indoor units, and a water supply system. The outdoor unit houses components such as a plate heat exchanger, compressor, gas-liquid separator, liquid receiver, and electrical box. The indoor unit contains components such as an indoor heat exchanger and indoor fan. The plate heat exchanger has water and refrigerant flow paths; the water path connects to the water supply system, and heat exchange occurs between the water and refrigerant paths. The refrigerant circulates between the outdoor and indoor units.

[0003] Because the outdoor unit of a water-source multi-split air conditioning system omits the finned heat exchanger, it cannot efficiently dissipate the heat generated in the electrical box to the ambient air using a forced-air cooling system. Therefore, the heat dissipation structure of the electrical box needs improvement. In one existing outdoor unit, the electrical box is located above the compressor; the heat generated by the compressor flows upwards back into the electrical box, affecting its heat dissipation performance.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] In response to the problems mentioned in the background art, this utility model proposes an outdoor unit and a water source multi-split unit to improve the heat dissipation effect of the electrical box.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0007] In some embodiments of this application, an outdoor unit is provided, including:

[0008] The housing has an internal mounting cavity and a first air inlet and a first air outlet.

[0009] Electrical box, the electrical box comprising:

[0010] An electrical box body, wherein a fan is installed inside the electrical box body, and a second air inlet is provided on the side wall of the electrical box body;

[0011] A heat dissipation duct is provided at the bottom of the electrical box body, and the top side of the heat dissipation duct is connected to the inner cavity of the electrical box body. The heat dissipation duct has a second air outlet, which faces the first air outlet.

[0012] The above technical solution has the following advantages or beneficial effects:

[0013] When the outdoor unit is running, the fan provides stable airflow, driving ambient outdoor air into the inner cavity through the first air inlet on the left side of the casing, and then directly to the surface of the electrical components through the second air inlet on the side wall of the electrical box, forming directional air cooling. After absorbing heat from the electrical components, the airflow is guided along the heat dissipation duct to the second air outlet, and finally discharged outdoors through the first air outlet on the right side of the casing, forming a complete active circulation of air intake, heat absorption, and exhaust, improving the heat dissipation effect of the electrical box.

[0014] This application sets the heat dissipation duct at the bottom of the electrical box body, with the second air outlet facing the first air outlet of the housing, and one end of the heat dissipation duct is closed. In this way, the heat generated by the compressor and gas-liquid separator located below cannot enter the electrical box, but is directly discharged from the first air outlet, effectively avoiding the influence of the heat below on the temperature of the electrical box.

[0015] In some embodiments of this application, a second air outlet is formed at the first end of the heat dissipation duct, the second end of the heat dissipation duct is closed, the first end and the second end are opposite to each other, and a guide portion is provided at the second end of the heat dissipation duct. The guide portion is configured to guide the airflow flowing from the inner cavity of the electrical box body into the heat dissipation duct to the second air outlet.

[0016] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects:

[0017] By guiding the airflow through the air guide section, hot air is prevented from flowing back into the inner cavity of the electrical box body.

[0018] The heat dissipation duct is a long, narrow channel with one open end and one closed end. The open end is the first end, forming a second air outlet corresponding to the first air outlet of the casing. The closed end is the second end, positioned opposite the first end, and its inner wall integrates an air guide. The air guide is an arc-shaped baffle, made of the same material as the heat dissipation duct, and smoothly transitions to the inner wall of the duct. When airflow enters the heat dissipation duct from the internal cavity of the electrical box, the air guide directs the airflow along the inner wall of the duct towards the second air outlet at the first end, preventing airflow from stagnating or flowing back at the closed end.

[0019] In some embodiments of this application, the air guide is arc-shaped, and the central angle of the arc of the air guide is θ, where θ ≥ 20° and θ ≤ 30°.

[0020] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects:

[0021] θ≥20° and θ≤30° optimize the airflow stripping angle, reduce vortices, and facilitate the rapid discharge of hot air.

[0022] If θ < 20°, the curvature of the air guide is insufficient, and the airflow is prone to prematurely separating from the surface of the air guide due to insufficient turning, forming vortices in the separation area.

[0023] If θ > 30°, the air guide is excessively curved, and the airflow is prone to generating backflow vortices on the inner side of the arc due to excessively sharp turns. Both situations will lead to airflow energy loss and reduce the hot air exhaust velocity.

[0024] In some embodiments of this application, the radius of the air guide is R, and the wall thickness of the heat dissipation duct is t, where R = 3t.

[0025] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects:

[0026] If R < 3t, the curvature of the air guide is too large and the bending is too steep, which will lead to stress concentration on the inner side of the arc. Under the vibration of the outdoor unit during operation, the air guide is prone to cracks.

[0027] If R > 3t, the arc of the air guide is too gentle, and the material distribution at the connection with the duct wall is uneven due to the large radius. This can easily lead to thermal deformation under high temperature conditions, affecting the accuracy of airflow guidance.

[0028] When R = 3t, the stress distribution in the arc-shaped area of ​​the air guide is uniform, no cracks appear after vibration test, and it is not easily deformed after high temperature test, thus meeting the structural stability requirements for long-term operation of the outdoor unit.

[0029] In some embodiments of this application, the height of the heat dissipation duct is H, and the diameter of the fan is D, where H = 0.7D.

[0030] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects:

[0031] If H < 0.7D, the duct height is too small, the turbulent vortex density increases, and the noise of the ground fissure group increases.

[0032] If H > 0.7D, the duct height is too large, and the airflow forms a backflow vortex in the gap, increasing the noise and accompanied by a noticeable whistling sound.

[0033] When H = 0.7D, the ground gap is exactly in the turbulent vortex suppression range. Through aeroacoustic simulation, it is verified that the airflow under this gap can smoothly enter the air duct along the fan tangent direction without obvious blockage or backflow. The noise sound pressure level of the ground gap group decreases and is completely integrated into the overall background noise of the outdoor unit, which cannot be distinguished by the human ear.

[0034] In some embodiments of this application, a protective net is provided at the second air outlet to prevent external dust and other foreign objects from entering the electrical box.

[0035] In some embodiments of this application, the housing includes a left side shell and a right side shell disposed opposite to each other, the left side shell is provided with the first air inlet, and the right side shell is provided with the first air outlet;

[0036] The electrical box is located at the top of the mounting cavity of the housing, and the second air outlet of the heat dissipation duct is close to the first air outlet.

[0037] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects:

[0038] There is a certain distance between the left end of the electrical box and the left side shell, forming a first space, which is reserved for the routing of refrigerant pipes. The right end of the electrical box is close to the right side shell, so that the first air outlet and the second air outlet are close together, which facilitates the hot air in the heat dissipation duct to be discharged as quickly as possible along the shortest path, thereby improving the heat dissipation effect.

[0039] In some embodiments of this application, the circumferential wall of the electrical box body includes a left side wall, a right side wall, a front side wall, and a rear side wall. The left side wall, front side wall, and rear side wall of the electrical box body are provided with a second air inlet. There is a gap between the left side wall of the electrical box body and the left side shell. There is a gap between the front side wall of the electrical box body and the front shell of the housing. There is a gap between the rear side wall of the electrical box body and the rear shell of the housing. The right side wall of the electrical box body is closed. The right side wall of the electrical box body and the second air outlet are located on the same side.

[0040] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects:

[0041] There are gaps between the left, front and rear sides of the electrical box and the shell, and air inlets are provided on the side walls of the electrical box in these three directions. External air can enter the electrical box from the three directions, increasing the air intake and helping to improve the heat dissipation of the electrical box.

[0042] In some embodiments of this application, the electrical box body is provided with a main control board, a drive board, a reactor and a fan. The main control board and the drive board are arranged at intervals along the length of the electrical box. The fan is disposed between the main control board and the drive board. The reactor is disposed between the main control board and the drive board and is disposed adjacent to the fan.

[0043] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects:

[0044] The reactor is the main heat source inside the electrical box. Placing the reactor next to the fan allows the fan to dissipate the heat generated by the reactor in a timely manner, and the heat will not pass through other electrical components during the dissipation process.

[0045] The fan is positioned in the middle of the electrical box, with the driver board and main control board placed on the left and right sides respectively, to ensure that the driver board and main control board can be cooled evenly.

[0046] In some embodiments of this application, a water source multi-split air conditioner is provided, including an indoor unit, a water source system, and an outdoor unit as described above.

[0047] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a structural diagram of an outdoor unit viewed from the front, according to some embodiments;

[0050] Figure 2 This is a structural diagram of an outdoor unit viewed from the rear, according to some embodiments;

[0051] Figure 3 A side view of an outdoor unit according to some embodiments;

[0052] Figure 4 This is a structural diagram of an outdoor unit according to some embodiments, with the top plate and part of the front casing omitted;

[0053] Figure 5 This is a structural diagram of an outdoor unit with the top plate omitted according to some embodiments;

[0054] Figure 6 This is a top view of an outdoor unit according to some embodiments;

[0055] Figure 7 for Figure 6 Sectional view along line AA;

[0056] Figure 8 This is a structural diagram of an electrical box according to some embodiments;

[0057] Figure 9 This is yet another structural diagram of an electrical box according to some embodiments;

[0058] Figure 10 This is a top view of an electrical box according to some embodiments, omitting the top cover;

[0059] Figure 11 This is a top view of an electrical box according to some embodiments;

[0060] Figure 12 for Figure 11 Sectional view along the BB direction;

[0061] Figure 13 for Figure 11 C-axis sectional view;

[0062] Figure 14 This is a front view of a second sheet metal part as seen from its exterior surface, according to some embodiments;

[0063] Figure 15 This is a structural diagram of a second sheet metal part viewed from a non-visual side according to some embodiments;

[0064] Figure 16 This is a front view of a third sheet metal part as seen from its exterior surface, according to some embodiments;

[0065] Figure 17 This is a rear view of a third sheet metal part as viewed from a non-exterior surface, according to some embodiments;

[0066] Figure 18 This is an internal layout diagram of an outdoor unit according to some embodiments;

[0067] Figure 19 for Figure 18 A structural diagram viewed from the Q side;

[0068] Figure 20 This is a structural diagram of a second plate heat exchanger according to some embodiments;

[0069] Figure 21 This is another structural diagram of a second plate heat exchanger according to some embodiments;

[0070] Figure 22 This is a partial structural diagram of a vent on a housing according to some embodiments;

[0071] Figure 23 This is a schematic diagram of a refrigerant flow path during outdoor unit refrigeration according to some embodiments;

[0072] Figure 24 This is a schematic diagram of a refrigerant flow path during outdoor unit heating according to some embodiments.

[0073] Figure label:

[0074] 100. Shell; 111. Front shell; 112. Rear shell; 113. Left side shell; 114. Right side shell; 115. Top plate; 121. First air inlet; 122. First air outlet; 130. Second sheet metal part; 131. Second reinforcing rib; 132. Second auxiliary reinforcing rib; 140. Third sheet metal part; 141. Third reinforcing rib; 142. Third auxiliary reinforcing rib; 143. Fourth auxiliary reinforcing rib; 151. First sub-front housing; 152. Second sub-front housing; 153. Third sub-front housing; 160. Refrigerant pipe inlet; 161. First sub-pipe inlet; 162. Second sub-pipe inlet; 170. Wiring inlet; 171. Low-voltage wiring inlet; 172. High-voltage wiring inlet; 181. First water pipe inlet; 182. Second water pipe inlet; 190. Ventilation opening; 191. Sub-ventilation opening; 192. Windshield;

[0075] 200. Electrical box; 210. Electrical box body; 211. Second air inlet; 220. Heat dissipation duct; 221. Second air outlet; 222. Air guide section; 231. Driver board; 232. Main control board; 233. Reactor; 234. Fan; 235. Heat dissipation fins; 236. Terminal block; 240. Support frame; 250. Wiring opening; 260. Protective net;

[0076] 310. Compressor; 320. Gas-liquid separator; 330. Liquid receiver; 340. Four-way reversing valve; 350. First plate heat exchanger; 360. Second plate heat exchanger; 361. First refrigerant branch; 362. Second refrigerant branch; 363. Third refrigerant branch; 364. Fourth refrigerant branch; 365. Positioning stud; 370. Temperature sensor; 380. First throttling device; 390. Second throttling device;

[0077] 410. Liquid-side shut-off valve; 420. Gas-side shut-off valve;

[0078] 510. First external pipeline; 520. Second external pipeline;

[0079] 600. Support unit; 610. Vertical plate; 620. Side plate; 630. Flip plate; 640. Positioning hole;

[0080] 700, First Space. Detailed Implementation

[0081] 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.

[0082] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0083] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0084] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0085] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0086] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0087] In some embodiments of this application, a water source multi-split air conditioner is provided, which is a type of central air conditioning system and includes an outdoor unit. Figure 1 This is a structural diagram of the outdoor unit as viewed from the front. Figure 2 This is a structural diagram of the outdoor unit as viewed from the rear. Figure 3 This is a side view of the outdoor unit. Figure 6 This is a top view of the outdoor unit. Figure 8 for Figure 7 Sectional view along line AA.

[0088] The outdoor unit includes a housing 100. The housing 100 is made of sheet metal. The housing 100 has a rectangular outline. The housing 100 includes a front housing 111 and a rear housing 112 arranged opposite each other. The housing 100 includes a left side housing 113 and a right side housing 114 arranged opposite each other. The housing 100 includes a top plate 115 and a bottom plate arranged opposite each other. Figure 4 This is a structural diagram of the outdoor unit after omitting the top plate 115 and part of the front casing 111. Figure 5 This is a structural diagram of the outdoor unit after omitting the top plate 115.

[0089] The outdoor unit contains components such as a plate heat exchanger, compressor 310, four-way reversing valve 340, gas-liquid separator 320, liquid receiver 330, and electrical box 200. These components are all installed in the internal mounting cavity of the casing 100.

[0090] Reference Figure 22 The four-way reversing valve 340 is connected to the outlet of the compressor 310, and the four-way reversing valve 340 is configured to change the flow direction of the refrigerant.

[0091] The gas-liquid separator 320 is connected to the inlet of the compressor 310 and is configured to separate the gas and liquid of the refrigerant flowing through it.

[0092] The receiver 330 is configured to balance the refrigerant circulation in the system, store excess refrigerant, and ensure the stable operation of the compressor 310, avoiding malfunctions caused by refrigerant supply and demand imbalance.

[0093] The electrical box 200 serves as the electrical control hub and safety protection core of the system. It is an enclosed unit that integrates various electrical components and is responsible for receiving instructions, coordinating equipment operation, monitoring faults, and triggering protection.

[0094] The plate heat exchanger (specifically, the first plate heat exchanger 350 described below) is configured to exchange heat with the refrigerant flowing through it using a water source. The first plate heat exchanger 350 has a water flow path and a refrigerant flow path, and heat exchange occurs between the water flow path and the refrigerant flow path.

[0095] Water-source multi-split systems also include indoor units (not shown). The indoor unit contains components such as an indoor heat exchanger and an indoor fan. Refrigerant circulates between the outdoor and indoor units.

[0096] The water source multi-split system also includes a water source system (not shown). The water flow path within the first plate heat exchanger 350 is connected to the water source system.

[0097] In existing technology, the refrigerant piping of the outdoor unit is designed with the pipes exiting from the front and top, requiring space to be reserved at the top of the unit's interior for piping. To facilitate the installation of the electrical box, some outdoor units have the box positioned vertically and facing forward within the unit's interior, with the wiring outlet located at the bottom of the unit. This low outlet position poses a risk of water contact; furthermore, the refrigerant piping and the electrical box wiring are not in the same location, hindering cable management after centralized off-site installation.

[0098] To address this technical problem, structural improvements have been made to the arrangement of the electrical box in some embodiments of this application.

[0099] Specifically, refer to Figure 4 and Figure 5 The electrical box 200 is located at the top of the mounting cavity inside the housing 100. The length of the electrical box 200 is less than the length of the housing 100. Figure 8 This is a structural diagram of an electrical box 200.

[0100] A first space 700 is formed between the electrical box 200 and the side wall of the housing 100. For example, there is a certain distance between the left end of the electrical box 200 and the left side housing 113, and this distance space is denoted as the first space 700. The right end of the electrical box 200 is located close to the right side housing 114.

[0101] The outdoor unit adopts a front-side piping and wiring method, that is, the refrigerant piping is led out from the front casing 111, and the wiring of the electrical box 200 is also led out from the front casing 111.

[0102] Reference Figure 1A refrigerant pipe outlet 160 is provided at the upper part of the front housing 111, and the refrigerant pipe outlet 160 is configured for the refrigerant pipe to pass through. The refrigerant pipe outlet 160 is correspondingly provided to the first space 700.

[0103] A wiring port 170 is provided at the upper part of the front cover 111, and the wiring port 170 is configured for the wiring of the power supply box 200.

[0104] In the existing technology, the electrical box is vertically installed in the lower part of the outdoor unit's inner cavity, and the wiring port is located below the equipment. However, the outdoor unit's operating environment (such as outdoor installation, rain erosion, and ground water splashing) can easily cause moisture to come into contact with the wiring port and wiring connectors, posing safety risks such as short circuits and leakage.

[0105] In this application, the electrical box 200 is installed at the top of the mounting cavity inside the housing 100. The wiring port 170 is moved up with the electrical box 200 to a position near the top of the front housing 111, away from the ground and the bottom of the equipment where water is likely to accumulate. This spatially cuts off the contact path between water and the wiring, significantly reducing the probability of electrical failure.

[0106] In the existing technology, the refrigerant pipeline is led out from the top front side, while the electrical box wiring is led out from the bottom. The two wiring positions are separate. When installing the machine outside the factory, the pipeline and wiring need to be fixed and arranged separately, which can easily lead to problems such as wiring tangling and interference between pipelines and wiring, increasing assembly time.

[0107] This application proposes a scheme that places the electrical box 200 on top and simultaneously sets up the refrigerant pipe outlet 160 and the wiring outlet 170 in the upper area of ​​the front shell 111. This allows the refrigerant pipe and electrical box wiring to be led out from the same area on the front side. During assembly, the pipes and wiring can be organized in the same direction, reducing cross-interference. It is also convenient to use a unified fixing bracket (such as pipe clamps and wire clamps) for integration and fixing, making the wiring layout more regular and improving the efficiency of off-site installation.

[0108] When equipment malfunctions and requires repair, maintenance personnel can simultaneously access the refrigerant piping interfaces and electrical box wiring connectors from the same front area, eliminating the need to separately disassemble the top of the equipment to check the piping and the bottom to check the wiring, thus reducing disassembly steps. Furthermore, the organized wiring layout allows for quick location of the corresponding pipes and wires, preventing misoperation due to messy wiring, improving maintenance efficiency, and reducing the risk of maintenance errors.

[0109] In the existing technology, the electrical box occupies the lower space of the inner cavity, which may restrict the installation position of core components such as water-side heat exchangers and water pumps, resulting in an increase in the overall size of the equipment.

[0110] This application moves the electrical box 200 to the top, freeing up the lower part of the inner cavity, which can be used to optimize the arrangement of the water-side heat exchanger or reduce the horizontal / vertical dimensions of the equipment, thereby achieving a miniaturized design of the outdoor unit while ensuring heat exchange performance.

[0111] The first space 700 formed between the electrical box 200 and the side wall of the housing 100 (such as the left side housing 113) corresponds to the refrigerant pipe outlet 160 of the front housing 111. This space can serve as a transition channel for the refrigerant pipe from the heat exchanger to the outlet. Compared with the existing technology where the top piping space needs to be reserved separately, the first space 700 of this solution has the dual functions of the side clearance of the electrical box 200 and the pipe buffer space. It can meet the needs of pipe bending and fixing without additionally increasing the size of the top of the equipment, thereby improving the utilization rate of the internal space and taking into account both structural compactness and pipe installation convenience.

[0112] In some embodiments of this application, reference is made to Figure 1 The refrigerant pipe outlet 160 and the wiring outlet 170 are arranged sequentially along the length of the housing 100, and the refrigerant pipe outlet 160 and the wiring outlet 170 are located at the same height.

[0113] The refrigerant pipe outlet 160 and the wiring outlet 170 are arranged sequentially along the length of the casing 100 without vertical or horizontal overlap. No adjustment or avoidance is required during installation, and there is no risk of pipes and cables getting tangled.

[0114] The refrigerant pipe access port 160 and the wiring port 170 are located at the same height, allowing installers to operate synchronously based on the same height reference without repeatedly adjusting their posture. During mass production, the uniformity of the opening height can be controlled through molds, adapting to large-scale production and installation.

[0115] In some embodiments of this application, reference is made to Figure 1 The refrigerant pipe outlet 160 includes a first sub-outlet 161. The refrigerant pipe outlet 160 also includes a second sub-outlet 162. The first sub-outlet 161 and the second sub-outlet 162 are arranged sequentially along the length of the housing 100, and the wiring outlet 170 is located adjacent to the second sub-outlet 162.

[0116] Reference Figure 4 A liquid-side shut-off valve 410 is installed at the liquid end of the refrigerant pipeline inside the outdoor unit. The liquid-side shut-off valve 410 is located inside the outdoor unit and below the first space 700. The liquid-side shut-off valve 410 is connected to the first external pipeline 510, which is L-shaped and passes through the first sub-pipe port 161.

[0117] A gas-side shut-off valve 420 is installed at the gas end of the refrigerant pipeline. The gas-side shut-off valve 420 is located in the inner cavity of the outdoor unit and is located below the first space 700. The gas-side shut-off valve 420 is connected to the second external pipeline 520, which is L-shaped. The first external pipeline 510 passes through the second sub-pipe port 162.

[0118] A breakable baffle is installed at the location of the first sub-pipe inlet 161 and the second sub-pipe inlet 162. During the installation of the outdoor unit, the baffle is broken before the first external pipe 510 and the second external pipe 520 are installed.

[0119] The first space 700 provides space for the L-shaped first external pipeline 510 and second external pipeline 520 to run pipes.

[0120] Before the outdoor unit leaves the factory, the liquid-side shut-off valve 410 and the gas-side shut-off valve 420 in the inner cavity are pre-fixed below the first space 700. When installing the outdoor unit, the operator needs to connect the first external pipe 510 and the second external pipe 520 to the corresponding shut-off valves respectively. The two external pipes are designed in an L-shape, and their horizontal sections can pass horizontally through the corresponding sub-pipe openings. The first sub-pipe opening 161 and the second sub-pipe opening 162 are arranged sequentially along the length of the casing 100 to avoid the problem of the two pipes crossing during the pipe laying process.

[0121] The first space 700 is the reserved space between the electrical box 200 and the side wall of the housing 100, so there is no need to open a pipeline channel for the L-shaped external pipeline in the inner cavity of the outdoor unit, nor is it necessary to increase the overall size of the equipment.

[0122] In some embodiments of this application, reference is made to Figure 8 The electrical box 200 is provided with a wiring opening 250, which faces the front shell 111 and is set to correspond with the wiring port 170.

[0123] The wiring opening 250 of the electrical box 200 faces the front shell 111 and corresponds to the wiring port 170, so that the wires can be led out from the inside of the electrical box 200 and pass through the wiring port 170 in a straight line without the need to reserve redundant wires between the electrical box 200 and the front shell 111.

[0124] In some embodiments of this application, reference is made to Figure 1 The wiring port 170 includes a low-voltage wiring port 171 and a high-voltage wiring port 172. The low-voltage wiring port 171 and the high-voltage wiring port 172 are arranged sequentially along the height direction of the housing 100 to facilitate wiring.

[0125] In some embodiments of this application, Figure 18 This is a structural diagram showing the internal layout of the outdoor unit. Figure 19 for Figure 18 A structural diagram viewed from direction Q. The mounting cavity is equipped with a compressor 310, a gas-liquid separator 320, and a first plate heat exchanger 350, which are arranged sequentially along the length of the shell 100.

[0126] The compressor 310, gas-liquid separator 320, and first plate heat exchanger 350 are the core series components of the refrigerant circulation system. Their sequential arrangement along the length of the casing 100 allows for a straight, short-distance refrigerant pipeline connection between them. This shortened pipeline length not only reduces material usage and costs but, more importantly, reduces the number of welded joints. Since welded joints are a major risk point for refrigerant leakage, this solution helps reduce the risk of refrigerant leakage.

[0127] The first plate heat exchanger 350 is located below the first space 700. The plate heat exchanger corresponds vertically to the first space 700 and is adapted for installation with external piping.

[0128] The electrical box 200 is located above the compressor 310 and the gas-liquid separator 320, making full use of the unused top space of the compressor 310 and the gas-liquid separator 320, resulting in a compact structural layout. The housing 100 has heat dissipation holes near the electrical box 200, through which the heat generated by the compressor 310 and the gas-liquid separator 320 during operation is dissipated, preventing high temperatures from affecting electrical performance.

[0129] As the core component of water-fluoride heat exchange, the first plate heat exchanger 350 needs to avoid heat interference with other components. In this design, the first plate heat exchanger 350 is independently arranged along the length direction on the right side of the gas-liquid separator 320, and is spaced a certain distance from the compressor 310, forming an independent heat exchange area.

[0130] After the electrical box 200 is placed on top, the compressor 310 and gas-liquid separator 320 area below it do not need to reserve additional space for electrical component installation. This is equivalent to overlapping and reusing the electrical control area and the mechanical function area in the vertical direction. The total volume of the installation cavity is reduced compared to the existing technology, and the overall size of the outdoor unit is reduced while ensuring the core functions.

[0131] In some embodiments of this application, reference is made to Figure 1 The front housing 111 includes a first sub-front housing 151, which is located in front of the compressor 310 and the gas-liquid separator 320.

[0132] The front shell 111 includes a second sub-front shell 152, which is located in front of the first plate heat exchanger 350. The second sub-front shell 152 has water pipe inlets, denoted as the first water pipe inlet 181 and the second water pipe inlet 182, which are spaced apart along the height of the shell 100. The first water pipe inlet 181 is located below the second water pipe inlet 182.

[0133] The water pipe connected to the inlet of the first plate heat exchanger 350 passes through the first water pipe outlet 181. The water pipe connected to the outlet of the first plate heat exchanger 350 passes through the second water pipe outlet 182.

[0134] The first water pipe inlet 181 and the second water pipe inlet 182 are respectively equipped with breakable plastic end plates. When installing outside the factory, the plastic end plates are broken to facilitate the connection of external water pipes.

[0135] The front housing 111 includes a third sub-front housing 153, which is located above the second sub-front housing 152. The third sub-front housing 153 is provided with a refrigerant pipe inlet 160 and a wiring inlet 170.

[0136] The front housing 111 consists of a first sub-front housing 151, a second sub-front housing 152, and a third sub-front housing 153. When installed off-site, the first sub-front housing 151 protects the compressor 310 and the gas-liquid separator 320, preventing damage to critical components such as the compressor 310 and the gas-liquid separator 320 due to improper operation or accidental contact by installers during disassembly. It also ensures the safety of materials highly sensitive to noise, such as sound insulation covers, wire ties, and vibration damping hammers, within the sheet metal. Thus, during installation, only the water-side and refrigerant-side interfaces need to be exposed.

[0137] The second front housing 152 and the third front housing 153 are arranged vertically, and they can be disassembled and installed independently. The installation of water pipes and refrigerant pipes is independent of each other.

[0138] In some embodiments of this application, Figure 9 This is a structural diagram of the electrical box 200 without the top cover. Figure 10 for Figure 9 A top view. The electrical box 200 is provided with a main control board 232, a drive board 231, a reactor 233 and a fan 234. The main control board 232 and the drive board 231 are arranged at intervals along the length of the electrical box 200. The fan 234 is located between the main control board 232 and the drive board 231. The reactor 233 is located between the main control board 232 and the drive board 231 and is located adjacent to the fan 234.

[0139] Reactor 233 is the main heat source inside electrical box 200. By placing reactor 233 next to fan 234, fan 234 can dissipate the heat generated by reactor 233 in a timely manner, and the heat will not pass through other electrical components during the dissipation process.

[0140] The fan 234 is positioned in the middle of the electrical box 200, with the driver board 231 and the main control board 232 placed on the left and right sides respectively, to ensure that the driver board 231 and the main control board 232 can dissipate heat evenly.

[0141] A minimum distance of 10mm is maintained between the main control board 232, the driver board 231 and the electrical box 200 in the circumferential sheet metal to ensure safety and provide sufficient space for wiring.

[0142] In some embodiments of this application, reference is made to Figure 10 Terminal block 236 is located adjacent to main control board 232, and terminal block 236 and main control board 232 are arranged sequentially along the width direction of electrical box 200.

[0143] There is a height difference between the terminal block 236 and the main control board 232, and the two are very close together, which makes it easy for the terminals and wiring to bend when wiring.

[0144] Therefore, in this application, Figure 11 This is a top view of the electrical box 200. Figure 12 for Figure 11 In the BB-direction sectional view, the bottom of the electrical box 200 is provided with a support frame 240, which is configured to install the terminal block 236 to reduce the height difference between the terminal block 236 and the main control board 232, thereby avoiding bending during wiring.

[0145] In existing technologies, outdoor units of water-source multi-split air conditioners, lacking finned heat exchangers, cannot efficiently dissipate the heat generated by the electrical box into the ambient air using a forced-air cooling system. Therefore, improvements to the heat dissipation structure of the electrical box are needed. In one current outdoor unit, the electrical box is located above the compressor; heat generated by the compressor flows upwards back into the electrical box, affecting its heat dissipation performance.

[0146] To address this technical problem, improvements have been made to the heat dissipation structure of the electrical box in some embodiments of this application.

[0147] Reference Figure 5 The housing 100 is provided with a first air inlet 121 and a first air outlet 122. For example, the left housing 113 is provided with a first air inlet 121 and the right housing 114 is provided with a first air outlet 122.

[0148] Reference Figure 8 and Figure 9 The electrical box 200 includes an electrical box body 210. Electrical components are installed in the inner cavity of the electrical box body 210. A fan 234 is provided inside the electrical box body 210 to provide airflow power. A second air inlet 211 is provided on the side wall of the electrical box body 210.

[0149] The electrical box 200 includes a heat dissipation duct 220. The heat dissipation duct 220 is located at the bottom of the electrical box body 210, and the top side of the heat dissipation duct 220 is connected to the inner cavity of the electrical box body 210. The heat dissipation duct 220 has a second air outlet 221, which faces the first air outlet 122.

[0150] When the outdoor unit is running, air from the external environment enters the inner cavity of the outdoor unit through the first air inlet 121. Under the action of the fan 234, the air continues to flow into the inner cavity of the electrical box body 210 through the second air inlet 211, then into the heat dissipation duct 220, and then flows out through the second air outlet 221 and the first air outlet 122 in sequence, thereby dissipating the heat in the inner cavity of the electrical box 200.

[0151] The compressor 310 and the gas-liquid separator 320 are located below the electrical box 200. The heat generated by the compressor 310 and the gas-liquid separator 320 rises and is also discharged through the second air outlet 221.

[0152] When the outdoor unit is running, the fan 234 provides stable airflow power, driving outdoor ambient air to enter the inner cavity through the first air inlet 121 on the left side of the casing 100, and then directly reach the surface of the electrical components through the second air inlet 211 on the side wall of the electrical box body 210, forming directional air cooling.

[0153] After absorbing heat from the electrical components, the airflow is guided along the heat dissipation duct 220 to the second air outlet 221, and finally discharged outdoors through the first air outlet 122 on the right side of the housing 100, forming a complete active circulation of air intake, heat absorption, and exhaust, thereby improving the heat dissipation effect of the electrical box 200.

[0154] In the prior art, the electrical box is located above the compressor. The heat generated by the compressor during operation flows upward through natural convection and directly enters the inner cavity of the electrical box, causing the temperature of the electrical components to rise cumulatively.

[0155] This application sets the heat dissipation duct 220 at the bottom of the electrical box body 210, with the second air outlet 221 facing the first air outlet 122 of the housing 100, and one end of the heat dissipation duct 220 is closed. In this way, the heat generated by the compressor 310 and the gas-liquid separator 320 cannot enter the electrical box 200, but is directly discharged from the first air outlet 122, effectively avoiding the influence of the heat below on the temperature of the electrical box 200.

[0156] The fan 234 is built into the inner cavity of the electrical box body 210, the heat dissipation duct 220 is integrated into the bottom of the electrical box 200, and the first air inlet 121 and the first air outlet 122 are directly opened on the side wall of the housing 100 without increasing the overall size of the outdoor unit.

[0157] Meanwhile, the position of the heat dissipation duct 220 matches the layout of the compressor 310 and the gas-liquid separator 320 below, so there is no need to adjust the installation position of the core components.

[0158] In some embodiments of this application, reference is made to Figure 12 , Figure 12 for Figure 11In the C-C cross-sectional view, a second air outlet 221 is formed at the first end of the heat dissipation duct 220, and the second end of the heat dissipation duct 220 is closed, with the first end opposite to the second end. The heat dissipation duct 220 is a channel that is closed at one end and open at the other. An air guide 222 is provided at the second end of the heat dissipation duct 220, which is configured to guide the airflow flowing from the inner cavity of the electrical box body 210 into the heat dissipation duct 220 to the second air outlet 221.

[0159] By guiding the airflow through the air guide section 222, hot air is prevented from flowing back into the inner cavity of the electrical box body 210.

[0160] The heat dissipation duct 220 is an elongated channel with one open end and one closed end. The open end is the first end, forming a second air outlet 221 corresponding to the first air outlet 122 on the housing 100. The closed end is the second end, which is opposite to the first end, and the inner wall of the second end integrates a guide section 222. The guide section 222 is an arc-shaped guide plate, made of the same material as the heat dissipation duct 220, and smoothly transitions to the inner wall of the duct. When airflow flows from the inner cavity of the electrical box body 210 into the heat dissipation duct 220, the guide section 222 can guide the airflow along the inner wall of the duct to the second air outlet 221 at the first end, preventing airflow from stagnating or flowing back at the closed end.

[0161] If the heat dissipation duct 220 is designed to be closed at one end and open at the other, without a guide section 222, the airflow will be blocked at the closed end after flowing into the heat dissipation duct 220 from the inner cavity of the electrical box body 210, resulting in airflow reversal. Some of the hot air that has absorbed heat will flow back along the inner wall of the duct and re-enter the inner cavity of the electrical box body 210, causing secondary heat accumulation in the inner cavity and reducing heat dissipation efficiency. In this embodiment, the arc-shaped structure of the guide section 222 can forcibly guide the airflow.

[0162] After the airflow enters the heat dissipation duct 220, it is guided by the guide plate to turn along the arc trajectory to the second air outlet 221 at the first end, so as to avoid the airflow directly hitting the closed end and turning back.

[0163] In some embodiments of this application, the air guide 222 is arc-shaped, and the central angle of the arc of the air guide 222 is θ, where θ ≥ 20° and θ ≤ 30°, thereby optimizing the airflow stripping angle, reducing eddies, and facilitating the rapid discharge of hot air.

[0164] When the airflow flows on the surface of the arc-shaped air guide 222, if the arc center angle θ < 20°, the curvature of the air guide 222 is insufficient, and the airflow is prone to prematurely separating from the surface of the air guide 222 due to insufficient turning, forming vortices in the separation area.

[0165] If θ > 30°, the air guide section 222 is excessively curved, and the airflow is prone to generating backflow vortices on the inner side of the arc due to excessively sharp turns. Both situations will lead to airflow energy loss and reduce the hot air exhaust speed.

[0166] In this embodiment, the angle range of 20°≤θ≤30° can be verified through simulation to achieve complete airflow conforming to the surface of the air guide 222.

[0167] In some embodiments of this application, the radius of the air guide 222 is R, and the wall thickness of the heat dissipation duct 220 is t, where R = 3t.

[0168] If R < 3t, the curvature of the air guide section 222 is too large and the bending is too steep, which will lead to stress concentration on the inner side of the arc. Under the vibration of the outdoor unit during operation, the air guide section 222 is prone to cracks.

[0169] If R > 3t, the arc of the air guide 222 is too gentle, and the material distribution at the connection with the duct wall thickness is uneven due to the large radius. It is prone to thermal deformation under high temperature environment, which affects the airflow guidance accuracy.

[0170] When R = 3t, the stress distribution in the arc-shaped area of ​​the air guide section 222 is uniform, no cracks are found after vibration test, and it is not easily deformed after high temperature test, thus meeting the structural stability requirements for long-term operation of the outdoor unit.

[0171] In some embodiments of this application, the height of the heat dissipation duct 220 is H, and the diameter of the fan 234 is D, where H = 0.7D. Controlling the height of the heat dissipation duct 220 prevents noise from the floor joint assembly.

[0172] Ground gap noise is a typical aerodynamic noise resulting from the interaction between fan airflow and the gap in the air duct. When the airflow generated by the rotation of fan 234 enters the heat dissipation air duct 220, if the air duct height H and the fan diameter D are not properly matched, turbulent vortices will be formed in the ground gap area between the fan 234 outlet and the air duct inlet. When the vortex breaks, high-frequency noise will be generated, which is ground gap noise.

[0173] If H < 0.7D, the duct height is too small, the turbulent vortex density increases, and the noise of the ground fissure group increases.

[0174] If H > 0.7D, the duct height is too large, and the airflow forms a backflow vortex in the gap, increasing the noise and accompanied by a noticeable whistling sound.

[0175] When H = 0.7D, the ground gap is exactly in the turbulent vortex suppression range. Through aeroacoustic simulation, it is verified that the airflow under this gap can smoothly enter the air duct along the tangent direction of the fan 234 without obvious blockage or backflow. The noise sound pressure level of the ground gap group decreases and is completely integrated into the overall background noise of the outdoor unit, which cannot be distinguished by the human ear.

[0176] In some embodiments of this application, a protective net 260 is provided at the second air outlet 221 to prevent external dust and other foreign objects from entering the electrical box 200.

[0177] In some embodiments of this application, a first air inlet 121 is provided on the left side shell 113, and a first air outlet 122 is provided on the right side shell 114. The electrical box 200 is disposed at the top of the mounting cavity of the shell 100, and the second air outlet 221 of the heat dissipation duct 220 is close to the first air outlet 122.

[0178] There is a certain distance between the left end of the electrical box 200 and the left side shell 113, forming a first space 700, which is a reserved space for the refrigerant pipe.

[0179] The right end of the electrical box 200 is close to the right side shell 114, which makes the first air outlet 122 and the second air outlet 221 close together, so that the hot air in the heat dissipation duct 220 can be discharged as quickly as possible through the shortest path, thereby improving the heat dissipation effect.

[0180] In some embodiments of this application, reference is made to Figure 9 The circumferential walls of the electrical box body 210 include a left side wall, a right side wall, a front side wall, and a rear side wall. Second air inlets 211 are respectively provided on the left side wall, front side wall, and rear side wall of the electrical box body 210. There is a gap between the left side wall of the electrical box body 210 and the left side shell 113, a gap between the front side wall of the electrical box body 210 and the front shell 111, and a gap between the rear side wall of the electrical box body 210 and the rear shell 112. The right side wall of the electrical box body 210 is closed, and the right side wall of the electrical box body 210 is located on the same side as the second air outlet 221.

[0181] The left, front and rear sides of the electrical box body 210 have gaps with the housing 100, and the electrical box 200 has air inlets on the side walls in these three directions. External air can enter the electrical box 200 from the three directions, increasing the air intake and helping to improve the heat dissipation effect of the electrical box 200.

[0182] The right end of the electrical box 200 is close to the right side shell 114. When hot air from the heat dissipation duct 220 is discharged from the second air outlet 221 to the first air outlet 122, the right end of the electrical box 200 is closed, which prevents hot air from flowing back into the electrical box 200 through this end. Furthermore, when heat from the bottom compressor 310 and the gas-liquid separator 320 is discharged through the first air outlet 122, heat is also prevented from flowing back into the electrical box 200 through the right end of the electrical box 200.

[0183] In some embodiments of this application, reference is made to Figure 13 The drive board 231 is connected to heat dissipation fins 235, which extend downward into the heat dissipation duct 220 to improve the heat dissipation effect of the heat dissipation fins 235 by utilizing airflow.

[0184] In existing technologies, outdoor units of water-source multi-split air conditioning systems, lacking finned heat exchangers, cannot efficiently dissipate the heat generated by electrical components into the ambient air using a forced-air cooling system. One existing outdoor unit has ventilation holes on its casing, but the specific arrangement of these holes has not been optimized, resulting in limited heat dissipation.

[0185] To address this technical problem, some embodiments of this application refer to... Figure 3 and Figure 5 The housing 100 includes two opposing end shells, namely the left end shell 113 and the right end shell 114 mentioned above. Each end shell has a vent 190, one of which serves as an air inlet and the other as an air outlet. Correspondingly, the vent 190 on the left end shell 113 is the first air inlet 121, and the air outlet on the right end shell 114 is the first air outlet 122.

[0186] Any vent 190 is an array formed by multiple sub-vents 191. The area of ​​the vent 190 is S1, and the area of ​​the end side shell is S2, where S1≥0.2S2 and S1≤0.35S2.

[0187] The electrical box 200 is located at the top of the mounting cavity of the housing 100. The electrical box 200 is provided with a second air inlet 211 and a second air outlet 221. The second air outlet 221 is close to the ventilation port 190, which serves as the air outlet, that is, the second air outlet 221 is close to the first air outlet 122.

[0188] In the existing technology, the heat dissipation holes of the outdoor unit casing are mostly scattered small circular holes without optimization of the area. As a result, the ventilation area is usually insufficient in proportion to the area of ​​the end side shell, and the amount of ambient cold air entering the installation cavity per unit time is limited, which cannot meet the heat dissipation needs of components such as electrical box 200 and compressor 310.

[0189] This application increases the effective ventilation area by setting up an array of ventilation openings. Each ventilation opening 190 is formed by an array of multiple sub-vents 191. Compared with scattered small holes, this can reduce the ineffective material area between adjacent holes and significantly increase the ventilation area ratio.

[0190] The area S1 of the vent 190 and the area S2 of the end side shell are limited to satisfy 0.2S2≤S1≤0.35S2. Actual tests show that within this area range, the ventilation volume per unit time is increased by 100%-125% compared to traditional heat dissipation holes, which can quickly introduce ambient cold air into the installation cavity and provide sufficient heat dissipation carrier for the electrical box 200 and compressor 310.

[0191] If S1 < 0.2S2, the ventilation area is too small, resulting in insufficient ventilation. If S1 > 0.35S2, the ventilation area is too large, leading to a decrease in the structural strength of the shell 100.

[0192] In existing technologies, heat dissipation holes are often randomly distributed without a clear air inlet and outlet direction, resulting in turbulent airflow within the mounting cavity, mixing of cold and hot air, and low heat dissipation efficiency. In this application, the ventilation openings 190 on the two end side shells are defined as the first air inlet 121 and the first air outlet 122, respectively, forming a counter-flow layout with air inlet on the left and air outlet on the right.

[0193] Cool ambient air enters the mounting cavity evenly through the first air inlet 121 on the left side, flows along the length of the housing 100, passes through the electrical box 200, and discharges heat from the first air outlet 122 on the right side, forming a through-flow airflow. This prevents hot air from stagnating around the electrical box 200 and improves its heat dissipation. The heat generated by the compressor 310 rises, and as the airflow passes through the electrical box 200, it simultaneously discharges this rising heat from the first air outlet 122.

[0194] In some embodiments of this application, the area of ​​any sub-vent 191 is S0, where S0 ≥ 20 mm2 and S0 ≤ 60 mm2.

[0195] The area of ​​the sub-vent 191 directly affects the local resistance coefficient of airflow. If S0 < 20mm 2 The small cross-section of the sub-vent 191 causes a constriction effect when airflow passes through it, resulting in a sharp increase in local resistance and a decrease in ventilation volume per unit time, which cannot meet the heat dissipation requirements of the installation cavity. Simultaneously, the high airflow velocity due to the small cross-section easily generates high-frequency turbulent noise at the orifice, which, combined with the noise from fan 234, causes the overall noise level of the outdoor unit to exceed the standard. Furthermore, while the small interception area of ​​the sub-vent 191 can block some large dust particles, the small orifice size easily leads to dust accumulation on the surface, forming a dust filter effect and causing blockage. This necessitates regular cleaning of the orifice, increasing the maintenance burden on users.

[0196] If S0 > 60mm 2 The excessively large cross-section of the sub-vent 191, while reducing the local resistance coefficient, easily leads to diffusion vortices in the airflow at the vent, resulting in uneven airflow distribution within the mounting cavity and creating localized blind spots in the heat dissipation of core components such as the compressor 310 and electrical box 200. Furthermore, large dust particles can easily penetrate the vent and enter the mounting cavity, causing dust accumulation in the heat dissipation duct 220 of the electrical box 200, requiring frequent disassembly and cleaning, thus increasing maintenance costs.

[0197] When 20mm 2 ≤S0≤60mm 2Through fluid dynamics simulation, it was verified that the local resistance coefficient of the sub-vent 191 is stable, and there is no obvious contraction or diffusion vortex when the airflow passes through it. The ventilation volume per unit time matches the total ventilation volume requirement limited by S1 mentioned above, and no additional noise is generated, achieving the dual goals of efficient ventilation and low noise. Furthermore, the orifice size of the sub-vent 191 can effectively block large dust particles while avoiding blockage of the orifice itself.

[0198] In some embodiments of this application, the length of any sub-vent 191 is L0, where L0 ≥ 10 mm and L0 ≤ 15 mm. The length L0 of the sub-vent 191 is the length extending along the width direction of the housing 100.

[0199] The width of any sub-vent 191 is W0, where W0 ≥ 5 mm and W0 ≤ 6 mm. The width W0 of the sub-vent 191 is the length extending along the height direction of the housing 100.

[0200] In the prior art, circular or square sub-vents lack clear airflow guidance, and the airflow tends to diffuse vertically after entering the mounting cavity, resulting in uneven airflow distribution between the top of the compressor 310 and the bottom of the electrical box 200. In this embodiment, L0≥10mm and L0≤15mm, and the sub-vent 191 extends along the width direction of the housing 100, forming a horizontal elongated channel.

[0201] When ambient cold air enters through the sub-vent 191, it is constrained by the horizontal elongated channel, and the airflow mainly flows along the length of the casing 100, with air entering from the left and exiting from the right, avoiding ineffective airflow diffusion. The horizontal directional airflow can accurately cover the core heat dissipation area of ​​the electrical box 200, improving the heat dissipation effect of the electrical box 200.

[0202] If L0 < 10mm, the length of the sub-ventilation opening 191 is too small, which is not conducive to air intake and cannot guarantee the air intake volume. If L0 > 15mm, the length of the sub-ventilation opening 191 is too long, which reduces the structural strength.

[0203] The width W0 of the sub-vent 191 extends vertically. If W0 > 6mm, the size is too large, the vertical airflow cross section increases, which can easily lead to a sudden increase in local airflow velocity, easily generate turbulent noise, and easily lead to excessive spacing of the vertical support ribs of the housing 100, resulting in a decrease in bending strength. If W0 < 5mm, the size is too small, the vertical airflow resistance increases, the heat rising from the compressor 310 cannot be discharged in time, and the temperature around the compressor 310 rises.

[0204] This application sets W0≥5mm and W0≤6mm to avoid noise caused by excessive wind speed while ensuring smooth heat dissipation.

[0205] In some embodiments of this application, Figure 14This is a front view of the end side shell. The distance between two adjacent sub-vents 191 along the width direction of the end side shell is d1, where d1≥19mm and d1≤21mm.

[0206] If d1 < 19mm, the distance between two adjacent vents 190 on the left and right is too small, reducing the structural strength of the end shell; if d > 21mm, the distance between two adjacent vents 190 on the left and right is too large, resulting in a smaller vent area and reduced air intake for the same shell area. This application sets d1 ≥ 19mm and d1 ≤ 21mm to balance the structural strength of the shell and the air intake.

[0207] The distance between two adjacent sub-vents 191 along the height direction of the end side shell is d2, where d2≥7mm and d2≤9mm.

[0208] If d2 < 7mm, the distance between two adjacent vents 190 is too small, reducing the structural strength of the end shell; if d > 9mm, the distance between two adjacent vents 190 is too large, resulting in a smaller vent area and reduced air intake for the same shell area. This application sets d2 ≥ 7mm and d2 ≤ 9mm to balance the structural strength of the shell and the air intake.

[0209] In some embodiments of this application, reference is made to Figure 22 A windbreak 192 is provided at the upper edge of any sub-vent 191. The windbreak 192 extends downward and is configured to guide the airflow from the sub-vent 191 downward, ensuring that the hot air emitted from each sub-vent 191 does not interfere with the airflow of adjacent sub-vent 191.

[0210] In some embodiments of this application, reference is made to Figure 5 Ventilation opening 190, second air inlet 211 and second air outlet 221 are at the same height, that is, first air inlet 121, second air inlet 211, second air outlet 221 and first air outlet 122 are at the same height.

[0211] In existing technologies, the air outlets are often misaligned due to their dispersed structural layout. The airflow needs to change direction during the flow process, and the local drag coefficient increases during the change process, resulting in a decrease in airflow speed and a reduction in heat dissipation efficiency.

[0212] In this application, the air inlet and outlet are at the same height. After the airflow enters from the first air inlet 121, it flows in a horizontal straight line and can reach the second air inlet 211. After absorbing heat in the inner cavity of the electrical box 200, it is discharged from the second air outlet 221 and still flows in a horizontal straight line towards the first air outlet 122, forming a straight flow path, which helps to improve the exhaust heat dissipation effect.

[0213] Highly misaligned air vents are prone to creating vortices in turning areas. Stagnant airflow in these vortex areas leads to heat accumulation and the formation of localized high temperatures. In this embodiment, the straight airflow path has no obvious turning point, thus avoiding the generation of vortices and heat accumulation.

[0214] The low-temperature ambient air introduced by the first air inlet 121 travels along a straight path to the second air inlet 211, providing a sufficient source of low-temperature airflow for the electrical box 200. The hot air exhausted from the electrical box 200 flows in a straight line from the second air outlet 221 to the first air outlet 122, and can be discharged outdoors without turning, avoiding secondary heating caused by the diffusion of hot air in the installation cavity.

[0215] In some embodiments of this application, the housing 100 includes a left housing 113 and a right housing 114. Ventilation openings 190 are provided on both the left and right housings 113 and 114. The ventilation opening 190 on the left housing 113 serves as a first air inlet 121, and the ventilation opening 190 on the right housing 114 serves as a first air outlet 122. A first space 700 is formed between the electrical box 200 and the left housing 113, and the electrical box 200 is located close to the right housing 114.

[0216] The outdoor unit also includes plate heat exchangers (including the first plate heat exchanger 350 and the second plate heat exchanger 360 described below), which are located below the first space 700. The compressor 310 and the gas-liquid separator 320 are located below the electrical box 200.

[0217] In this application, a first space 700 is formed between the left side shell 113 of the housing 100 and the electrical box 200. The electrical box 200 is offset towards the right side shell 114. A plate heat exchanger is fixedly installed below the first space 700, which is a reserved space for refrigerant pipe routing. The compressor 310 and the gas-liquid separator 320 are arranged along the length of the housing 100 and are located directly below the electrical box 200. This layout ensures the pipe routing requirements of the plate heat exchanger while enhancing the synergy of the heat dissipation system, adapting to the compactness and functional integration requirements of the outdoor unit of a water-source multi-split air conditioning system.

[0218] As mentioned above, the first space 700 provides space for the refrigerant piping. At the same time, the cold air flowing in from the first air inlet 121 reaches the electrical box 200 after passing through the first space 700 without the interference of hot air flow back. Since most of the space area of ​​the first space 700 is empty, the airflow obstruction is reduced, which facilitates the cold air to reach the electrical box 200 smoothly and also helps the electrical box 200 to dissipate heat.

[0219] In the existing technology, there is an outdoor unit that further subcools the condensed refrigerant through copper subcooling pipes. The subcooling section requires splicing of various pipes of different sizes, which is complicated. Moreover, the subcooling function depends on the length of the pipes, resulting in low heat exchange efficiency and a large space occupation.

[0220] To address this technical problem, in some embodiments of this application, plate heat exchangers are used for subcooling to improve heat exchange efficiency and reduce the space occupied by piping.

[0221] Specifically, refer to Figure 18 and Figure 19 as well as Figure 23 The outdoor unit includes a compressor 310.

[0222] The outdoor unit includes a four-way reversing valve 340, which is connected to the outlet of the compressor 310. The four-way reversing valve 340 is configured to change the flow direction of the refrigerant.

[0223] The outdoor unit includes a gas-liquid separator 320, which is connected to the inlet of the compressor 310. The gas-liquid separator 320 is configured to separate the gas and liquid of the refrigerant flowing through it.

[0224] The outdoor unit includes a first plate heat exchanger 350, which is configured to exchange heat between the flowing water and the refrigerant.

[0225] The outdoor unit includes a second plate heat exchanger 360, which contains a first refrigerant flow path and a second refrigerant flow path. The second refrigerant flow path is configured to exchange heat with the first refrigerant flow path to increase the subcooling of the refrigerant in the first refrigerant flow path. One end of the first refrigerant flow path is connected to the first plate heat exchanger 350 via a first refrigerant branch 361, and the other end is connected to the indoor unit via a second refrigerant branch 362. One end of the second refrigerant flow path is connected to the first refrigerant branch 361 via a third refrigerant branch 363, and the other end is connected to a refrigerant pipeline located between the four-way reversing valve 340 and the gas-liquid separator 320 via a fourth refrigerant branch 364. A throttling device, denoted as a second throttling device 390, is provided on the third refrigerant branch 363. For example, the second throttling device 390 is an electronic expansion valve.

[0226] The first plate heat exchanger 350 is a water-fluorine heat exchange plate, responsible for the initial heat exchange between the water source and the refrigerant. The second plate heat exchanger 360 is a subcooling plate heat exchanger, responsible for the secondary cooling of the refrigerant, enabling heat exchange between the high-temperature liquid refrigerant and the low-temperature gaseous refrigerant, achieving subcooling of the liquid refrigerant and increasing the unit cooling capacity.

[0227] Reference Figure 23In a water-source multi-unit refrigeration system, the refrigerant discharged from the compressor 310 flows sequentially through the four-way reversing valve 340, the first plate heat exchanger 350, and the first throttling device 380. The refrigerant flowing out of the first throttling device 380 is divided into two paths: one path flows through the first branch 361 into the first refrigerant flow path in the second plate heat exchanger 360, and then flows from the first branch 361 to the indoor unit; the other path flows through the third branch 363 into the second refrigerant flow path in the second plate heat exchanger 360, and then flows from the fourth branch 364 to the gas-liquid separator 320, and then returns to the compressor 310. When the refrigerant flows through the third branch 363, it is throttled by the second throttling device 390.

[0228] Reference Figure 24 When the water source multi-unit heating system is in operation, the refrigerant discharged from the compressor 310 flows to the indoor unit through the four-way reversing valve 340. The refrigerant returning from the indoor unit to the outdoor unit first flows into the second refrigerant branch 362, then into the first refrigerant flow path in the second plate heat exchanger 360, and then flows out from the first refrigerant branch 361. The refrigerant in the first refrigerant branch 361 is divided into two paths: one path flows into the first plate heat exchanger 350 through the first throttling device 380, and then returns to the compressor 310 through the four-way reversing valve 340 and the gas-liquid separator 320; the other path flows into the second refrigerant flow path in the second plate heat exchanger 360 through the third refrigerant branch 363, then flows to the gas-liquid separator 320 through the fourth refrigerant branch 364, and then returns to the compressor 310. When the refrigerant flows through the third refrigerant branch 363, it is throttled by the second throttling device 390.

[0229] This application upgrades the subcooling function from a traditional pipe length-dependent type to a high-efficiency plate heat exchanger type through a collaborative design of dual plate heat exchangers. The first plate heat exchanger 350 undertakes the initial heat exchange between the water source and the refrigerant, realizing the initial condensation of the refrigerant; the second plate heat exchanger 360, through its built-in independent first and second refrigerant flow paths, utilizes the temperature difference between the low-temperature gaseous refrigerant and the high-temperature liquid refrigerant in the system for secondary heat exchange, actively improving the subcooling degree of the liquid refrigerant. At the same time, the second throttling device 390 precisely controls the refrigerant flow rate and temperature in the second flow path, ensuring stable subcooling effect under both cooling and heating conditions.

[0230] Under refrigeration conditions, the first flow path of the refrigerant is through the high-temperature liquid refrigerant coming out of the first plate heat exchanger 350, while the second flow path of the refrigerant is through the low-temperature gaseous refrigerant after being throttled by the second throttling device 390. The temperature difference between the two is large, much greater than the temperature difference between the traditional subcooling pipe and the environment, thus improving the heat exchange efficiency.

[0231] By adjusting the opening of the second throttling device 390, the refrigerant flow rate and the temperature after throttling in the second refrigerant flow path can be precisely controlled, thereby stabilizing the refrigerant subcooling in the first refrigerant flow path within the set range.

[0232] During heating, the refrigerant returning from the indoor unit flows through the first refrigerant flow path in the second plate heat exchanger 360, while the second refrigerant flow path is filled with low-temperature refrigerant after throttling. Through temperature difference heat exchange, the refrigerant temperature in the first refrigerant flow path can be reduced in advance, thereby reducing the heat load on the subsequent first plate heat exchanger 350.

[0233] Traditional copper subcooling tubes rely on pipe length for subcooling effectiveness, requiring linear arrangement space within the outdoor unit. This large space requirement restricts the placement of other core components (such as the compressor 310 and the first plate heat exchanger 350). In this application, the second plate heat exchanger 360 adopts a flat, three-dimensional structure. The second plate heat exchanger 360 connects to related pipe assemblies and measures 340mm × 216mm × 554mm, while the copper subcooling tube assembly measures 378mm × 116mm × 562mm. The copper tube length used in the plate heat exchanger assembly is reduced by 10.8% compared to the subcooling tubes, allowing for manufacturing with less welding fixtures and processing time, thus improving efficiency by 15%.

[0234] The second plate heat exchanger 360 can be installed side by side with the first plate heat exchanger 350 below the first space 700 without taking up additional space in the length or width of the installation cavity, thus reducing the overall size of the outdoor unit by 15%-20% compared to traditional solutions.

[0235] In existing technologies, the subcooling effect of copper subcooling tubes is essentially ineffective under heating conditions, resulting in low heating efficiency. This application's second plate heat exchanger 360 achieves stable subcooling operation under both cooling and heating conditions through a combination of flow path design and throttling control. Specifically:

[0236] During refrigeration, as mentioned above, the high-temperature liquid refrigerant flows through the first refrigerant flow path, while the low-temperature gaseous refrigerant flows through the second refrigerant flow path after being throttled by the second throttling device 390. The heat exchange between the two achieves subcooling of the first refrigerant flow path, thereby increasing the refrigeration capacity.

[0237] During heating operation, the refrigerant returning from the indoor unit first flows through the first refrigerant flow path in the second plate heat exchanger 360. The second refrigerant flow path is then filled with low-temperature refrigerant after throttling. Through heat exchange, the temperature of the refrigerant in the first refrigerant flow path is reduced, thereby reducing the heat load on the subsequent first plate heat exchanger 350. At the same time, it avoids system pressure fluctuations caused by excessively high refrigerant temperature in the first refrigerant flow path.

[0238] Traditional copper subcooling pipes lack active temperature control. When the ambient temperature is too low, excessive subcooling can cause refrigerant to freeze inside the pipes, clogging them. Conversely, when the ambient temperature is too high, insufficient subcooling leads to inadequate cooling capacity. The design of the second throttling device 390 (such as an electronic expansion valve) in this application effectively solves this problem.

[0239] The system controller collects the outlet temperature of the first refrigerant flow path and the inlet temperature of the second refrigerant flow path, and adjusts the opening of the second throttling device 390 in real time to control the subcooling of the first refrigerant flow path within the target range.

[0240] In some embodiments of this application, reference is made to Figure 23 A temperature sensor 370 is installed on the second refrigerant branch 362, and the throttling device is an electronic expansion valve, which is configured to adjust its opening degree according to the detection data of the temperature sensor 370.

[0241] The temperature sensor 370 collects the temperature of the liquid refrigerant in real time. The second throttling device 390 dynamically adjusts its opening based on the detection data of the temperature sensor 370, thereby controlling the refrigerant flow rate and the temperature after throttling in the second refrigerant flow path, and ultimately ensuring that the subcooling of the refrigerant in the first refrigerant flow path is stable within the target range.

[0242] In some embodiments of this application, reference is made to Figure 18 and Figure 19 The compressor 310 and the first plate heat exchanger 350 are spaced apart along the length of the housing 100. The gas-liquid separator 320 is disposed between the compressor 310 and the first plate heat exchanger 350. The first plate heat exchanger 350 and the second plate heat exchanger 360 are arranged sequentially along the width of the housing 100. The first plate heat exchanger 350 is disposed near the front shell 111 of the housing 100, and the second plate heat exchanger 360 is disposed near the rear shell 112 of the housing 100.

[0243] The compressor 310 generates a lot of heat when it is running. In this application, there is a certain distance between the compressor 310 and the first plate heat exchanger 350. The gas-liquid separator 320 embedded in the middle can form a heat buffer layer to reduce the transfer of high temperature from the compressor 310 to the first plate heat exchanger 350.

[0244] As the core component of water-fluoride heat exchange, the first plate heat exchanger 350 requires regular cleaning of water-side scale. The first plate heat exchanger 350 is located at the front, in the front operating area. After the front shell 111 is disassembled, its water-side interface can be directly accessed. No other components need to be disassembled during cleaning, which facilitates scale removal and pipeline maintenance.

[0245] The second plate heat exchanger 360 is designed to make full use of the space behind the first plate heat exchanger 350, resulting in a compact layout.

[0246] The compressor 310 is located on one side along the length, the first plate heat exchanger 350 is located on the other side, and the gas-liquid separator 320 is embedded in the middle to facilitate the balance of the center of gravity of the whole machine.

[0247] In some embodiments of this application, reference is made to Figure 20 and Figure 21 The installation cavity is equipped with a support part 600, which is a sheet metal bracket. The support part 600 is provided with a positioning hole 640, and the second plate heat exchanger 360 is provided with a positioning stud 365, which passes through the positioning hole 640 and is equipped with a nut.

[0248] When installing the second plate heat exchanger 360, the positioning stud 365 passes through the positioning hole 640 to pre-position the installation. Then, a nut is installed on the positioning stud 365 to fix the second plate heat exchanger 360 on the support 600, which facilitates disassembly and assembly.

[0249] In some embodiments of this application, reference is made to Figure 21 The support 600 includes a vertical plate 610, side plates 620 are respectively provided on opposite sides of the vertical plate 610, and a flap 630 is provided on the bottom side of the vertical plate 610. The flap 630 is configured to be fixedly connected to the bottom plate of the housing 100 by bolts or the like. A space for accommodating the second plate heat exchanger 360 is formed between the vertical plate 610 and the two side plates 620. A positioning hole 640 is provided on the vertical plate 610.

[0250] The vertical plate 610 of the support 600 and the side plates 620 on both sides form an enclosing structure for the second plate heat exchanger 360, which helps to improve the stability of the second plate heat exchanger 360 after installation.

[0251] In some embodiments of this application, a first sub-pipe port 161 is provided on the front housing 111, and the refrigerant pipeline between the second refrigerant branch 362 and the indoor unit passes through the first sub-pipe port 161. In other words, as described above, a liquid-side shut-off valve 410 is provided on the second refrigerant branch 362, and the refrigerant pipeline between the second refrigerant branch 362 and the indoor unit includes a first external pipeline 510, which passes through the first sub-pipe port 161.

[0252] The front casing 111 is provided with a second sub-pipe port 162, through which the refrigerant line between the four-way reversing valve 340 and the indoor unit passes. In other words, as mentioned above, a gas-side shut-off valve 420 is provided on the line from the four-way reversing valve 340 to the indoor unit. The gas-side shut-off valve 420 is connected to a second external pipe line 520, which is used to connect to the indoor unit and passes through the second sub-pipe port 162.

[0253] In this embodiment, the first sub-pipe port 161, the second sub-pipe port 162 and the wiring port 170 are centrally located to form a front upper pipe and wiring functional area, and the space below can be used to arrange other components, resulting in a compact structural layout.

[0254] In some embodiments of this application, the first sub-pipe port 161, the second sub-pipe port 162, and the wiring port 170 are arranged sequentially along the length of the front housing 111, which facilitates the centralized routing of refrigerant pipelines and electrical box 200 wiring.

[0255] In existing technologies, outdoor unit casing sheet metal parts are thinned to control overall unit cost. When designing and using large-area sheet metal, the sheet metal itself is prone to twisting due to insufficient strength, affecting the assembly efficiency and quality of the entire unit.

[0256] To address this technical problem, some embodiments of this application involve structural improvements to the shell sheet metal parts. The reinforcing ribs on the shell sheet metal parts are correlated with the area of ​​the sheet metal parts, thereby increasing the structural strength of the sheet metal parts and improving assembly efficiency and quality.

[0257] Specifically, the housing 100 is composed of multiple sheet metal parts. The area of ​​any sheet metal part is denoted as St.

[0258] Sheet metal parts with an area St ≤ 0.1m² are designated as the first sheet metal part. No reinforcing ribs are provided on the first sheet metal part. The first sheet metal part has a small area and does not require additional reinforcing ribs to meet the sheet metal strength requirements.

[0259] Sheet metal parts with an area St > 0.1m² and ≤ 0.5m² are designated as the second sheet metal part 130. Figure 14 This is a front view of the second sheet metal part 130 from the exterior side. Figure 15 This is a structural drawing of the second sheet metal part 130 viewed from a non-exterior surface. (Combined with...) Figure 1 and Figure 2 The second sheet metal part 130 can be used as the first sub-front shell 151 in the left side shell 113, right side shell 114 and front shell 111 of the housing 100.

[0260] The second sheet metal part 130 is provided with a plurality of second reinforcing ribs 131, which extend along the width direction of the second sheet metal part 130 and are spaced apart along the length direction of the second sheet metal part 130. For example Figure 14 The second sheet metal part 130 shown has three second reinforcing ribs 131. The second reinforcing ribs 131 are located below the vent 190.

[0261] Sheet metal parts with an area St > 0.5m2 are designated as the third sheet metal part 140. Figure 16 This is a front view of the third sheet metal part 140 viewed from the exterior side. Figure 17 This is a structural diagram of the third sheet metal part 140 viewed from a non-exterior surface. (Combined with...) Figure 1 and Figure 2 The third sheet metal rib can be used as the rear shell 112 and the top plate 115 of the housing 100.

[0262] Multiple third reinforcing ribs 141 are provided on the third sheet metal part 140. The third reinforcing ribs 141 extend along the width direction of the third sheet metal part 140, and the multiple third reinforcing ribs 141 form an array. For example Figure 16 The third sheet metal rib shown has eight third reinforcing ribs 141, which are arranged in two columns and four rows along the width and length of the third sheet metal part 140.

[0263] This application classifies the 100 sheet metal parts of the shell into three categories based on their area and matches them with differentiated reinforcing rib schemes. The first sheet metal part (St≤0.1m) 2 The first sheet metal part has a small area and sufficient rigidity, so no reinforcing ribs are needed; the second sheet metal part is 130 (0.1m). 2 <St≤0.5m 2 The area is medium, and a second reinforcing rib 131 extending along the width direction and spaced apart along the length direction is provided on a non-exterior surface and below the ventilation opening 190; the third sheet metal part 140 (St>0.5m) 2 For sheet metal with large area and high torsional resistance requirements, a third reinforcing rib 141 is provided on the non-appearance surface, extending along the width direction and arranged in an array. This application adopts a design approach of strengthening as needed, which ensures the strength of the sheet metal while avoiding over-design, solving the torsion problem and improving assembly efficiency.

[0264] In existing technologies, to simplify design, reinforcing ribs are often uniformly set on all sheet metal parts, resulting in St≤0.1m. 2 Excessive reinforcement of small-area sheet metal parts increases costs. In this application, the first sheet metal part with a small area is not reinforced, and based on mechanical calculations, the first sheet metal part meets the structural strength requirements.

[0265] In the prior art, the thinned second sheet metal part 130 and the third sheet metal part 140 are prone to distortion due to the lack of differentiated reinforcement. This application provides two types of reinforcing ribs with different arrangements on the second sheet metal part 130 and the third sheet metal part 140, which, while meeting structural strength requirements, also helps to avoid increased costs due to excessive reinforcement of the sheet metal parts.

[0266] In some embodiments of this application, the distance between two adjacent second reinforcing ribs 131 along the length direction of the second sheet metal part 130 is D1, where D1≥200mm and D1≤300mm.

[0267] The second sheet metal part 130 uses reinforcing ribs to offset the risk of torsion after thinning while avoiding increased costs due to excessive reinforcement. If D1 < 200mm, excessively dense rib arrangement, although improving bending stiffness, will lead to increased costs, and excessively dense ribs will increase the weight of the sheet metal part, which does not meet the lightweight requirements of the outdoor unit. During stamping, excessively dense rib cavities are prone to local stress concentration in the sheet metal part, increasing the processing cracking rate and decreasing the pass rate.

[0268] If D1 > 300mm, the reinforcing ribs are too sparsely distributed, resulting in uneven rigidity distribution along the length of the sheet metal part. The unreinforced area between adjacent reinforcing ribs increases, making this area prone to denting under the tightening force of assembly bolts or outdoor wind pressure. Simultaneously, insufficient torsional resistance leads to increased torsion of the second sheet metal part 130, requiring hole enlargement during assembly and increasing the risk of assembly errors.

[0269] When 200mm≤D1≤300mm, through mechanical simulation and actual measurement verification, the bending stiffness and torsion are controlled within the target range, fully meeting the assembly accuracy requirements, while also taking into account strength and economy.

[0270] In some embodiments of this application, the second sheet metal part 130 has a load-bearing area, and the distance between two adjacent second reinforcing ribs 131 located in the load-bearing area is D2, where D2 ≥ 150 mm and D2 ≤ 200 mm. The second reinforcing ribs 131 in the load-bearing area are arranged more densely to ensure that the sheet metal part has no obvious curvature.

[0271] If D2 < 150mm, the reinforcing ribs are too dense, increasing cost and weight. If D2 > 200mm, the reinforcing ribs are too sparse, resulting in insufficient torsional resistance and increased torsion.

[0272] In some embodiments of this application, the second reinforcing rib 131 protrudes toward the outer surface of the second sheet metal part 130, and the height of the second reinforcing rib 131 is H1, where H1≥5mm and H1≤8mm.

[0273] If H1 < 5mm, the cross-sectional moment of inertia and bending stiffness of the reinforcing rib decrease, failing to offset deformation caused by outdoor wind pressure or assembly force. If H1 > 8mm, although the cross-sectional moment of inertia and bending stiffness of the reinforcing rib increase, it exceeds the target range, increasing cost and weight.

[0274] When 5mm≤H1≤8mm, the cross-sectional moment of inertia and bending stiffness of the stiffener are moderate, and no additional cost or weight is added.

[0275] In some embodiments of this application, the second sheet metal part 130 is provided with an opening, such as an observation window or an interface hole. The opening is ≥30mm away from the edge of the second sheet metal part 130 to ensure the edge's resistance to deformation.

[0276] In some embodiments of this application, reference is made to Figure 15 An auxiliary reinforcing rib, referred to as the second auxiliary reinforcing rib 132, is provided along the weak edge of the second sheet metal part 130, such as the free edge without folding, to enhance the edge's resistance to deformation.

[0277] In some embodiments of this application, the distance between two adjacent third reinforcing ribs 141 along the width direction of the third sheet metal part 140 is D3, where D3 ≥ 20 mm and D3 ≤ 40 mm.

[0278] If D3 < 20mm, although the transverse bending stiffness can be improved, the excessive density of the reinforcing ribs leads to increased cost and weight, and the material flow is impeded during stamping, resulting in a higher rate of localized cracking. If D3 > 40mm, the transverse stiffness decreases and the torsion increases.

[0279] When 20mm≤D3≤40mm, through mechanical simulation and actual measurement verification, the lateral rigidity and lateral torsion meet the standards, while taking into account cost and weight.

[0280] The distance between two adjacent third reinforcing ribs 141 along the length of the third sheet metal part 140 is D4, where D4≥300mm and D4≤400mm.

[0281] If D4 < 300mm, the longitudinal stiffening ribs are too dense. Although the longitudinal stiffness is improved, it exceeds the requirements and leads to increased costs. If D4 > 400mm, the longitudinal unstiffened area is too long. The rear shell 112 is prone to wavy deformation under vertical vibration, and the top plate 115 suffers from insufficient longitudinal support. Stress concentration occurs at the mounting bolts of the electrical box 200, resulting in localized dents in the sheet metal.

[0282] When 300mm≤D4≤400mm, the longitudinal rigidity is balanced, the vibration deformation of the rear shell 112 is small, the top plate 115 has no local dents, and the economy is also taken into account.

[0283] In some embodiments of this application, the third reinforcing rib 141 protrudes towards the outer surface of the third sheet metal part 140, and the height of the second reinforcing rib 131 is H2, where H2 ≥ 8mm and H2 ≤ 12mm. This is to prevent processing cracking.

[0284] If H2 < 8mm, the cross-sectional moment of inertia and bending stiffness of the reinforcing rib decrease, failing to offset deformation caused by outdoor wind pressure or assembly force. If H2 > 12mm, although the cross-sectional moment of inertia and bending stiffness of the reinforcing rib increase, it exceeds the target range, increasing cost and weight.

[0285] When 8mm≤H2≤12mm, the cross-sectional moment of inertia and bending stiffness of the stiffener are moderate, and no additional cost or weight is added.

[0286] In some embodiments of this application, reference is made to Figure 17The third sheet metal part 140 is provided with auxiliary reinforcing ribs at its four corners, referred to as the third auxiliary reinforcing ribs 142. The third auxiliary reinforcing ribs 142 are L-shaped structures, including horizontal reinforcing ribs and vertical reinforcing ribs. The horizontal reinforcing ribs extend along the width direction of the third sheet metal part 140, and the vertical reinforcing ribs extend along the length direction of the third sheet metal part 140.

[0287] By setting an L-shaped third auxiliary reinforcing rib 142 at the corner of the larger third sheet metal part 140, the corner is prevented from sagging or twisting.

[0288] In some embodiments of this application, reference is made to Figure 17 An auxiliary reinforcing rib, designated as the fourth auxiliary reinforcing rib 143, is provided along the weak edge of the third sheet metal part 140, such as the free edge without folding, to enhance the edge's resistance to deformation.

[0289] In some embodiments of this application, reference is made to Figure 1 and Figure 2 The housing 100 includes a left side housing 113, a right side housing 114, a front housing 111, a rear housing 112, a top cover, and a bottom plate. The left side housing 113 and the right side housing 114 are made of a second sheet metal part 130, and the rear housing 112 and the top plate 115 are made of a third sheet metal part 140.

[0290] The front shell 111 includes a first sub-front shell 151, a second sub-front shell 152, and a third sub-front shell 153. The first sub-front shell 151 and the second sub-front shell 152 are arranged sequentially along the width direction of the front shell 111. The third sub-front shell 153 is located above the second sub-front shell 152. The first sub-front shell 151 is made of a second sheet metal part 130, and the second sub-front shell 152 and the third sub-front shell 153 are made of a first sheet metal part.

[0291] As mentioned above, the second sub-front housing 152 is provided with a water inlet and a water outlet, and the third sub-front housing 153 is provided with a refrigerant pipe routing port 160 and an electrical box 200 wiring port 170.

[0292] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0293] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An outdoor unit, characterized in that, Including: The housing has an internal mounting cavity and a first air inlet and a first air outlet. Electrical box, the electrical box comprising: An electrical box body, wherein a fan is installed inside the electrical box body, and a second air inlet is provided on the side wall of the electrical box body; A heat dissipation duct is provided at the bottom of the electrical box body, and the top side of the heat dissipation duct is connected to the inner cavity of the electrical box body. The heat dissipation duct has a second air outlet, which faces the first air outlet.

2. The outdoor unit according to claim 1, characterized in that, The first end of the heat dissipation duct forms the second air outlet, the second end of the heat dissipation duct is closed, the first end and the second end are opposite to each other, and the second end of the heat dissipation duct is provided with an air guide, which is configured to guide the airflow flowing from the inner cavity of the electrical box body into the heat dissipation duct to the second air outlet.

3. The outdoor unit according to claim 2, characterized in that, The air guide is arc-shaped, and the central angle of the arc of the air guide is θ, where θ ≥ 20° and θ ≤ 30°.

4. The outdoor unit according to claim 3, characterized in that, The radius of the air guide is R, and the wall thickness of the heat dissipation duct is t, where R = 3t.

5. The outdoor unit according to claim 2, characterized in that, The height of the heat dissipation duct is H, and the diameter of the fan is D, where H = 0.7D.

6. The outdoor unit according to claim 1, characterized in that, A protective net is installed at the second air outlet.

7. The outdoor unit according to any one of claims 1 to 6, characterized in that, The housing includes a left side shell and a right side shell arranged opposite to each other. The left side shell is provided with the first air inlet, and the right side shell is provided with the first air outlet. The electrical box is located at the top of the mounting cavity of the housing, and the second air outlet of the heat dissipation duct is close to the first air outlet.

8. The outdoor unit according to claim 7, characterized in that, The circumferential walls of the electrical box body include a left side wall, a right side wall, a front side wall, and a rear side wall. The second air inlet is provided on the left side wall, the front side wall, and the rear side wall of the electrical box body. There is a gap between the left side wall of the electrical box body and the left side shell. There is a gap between the front side wall of the electrical box body and the front shell of the housing. There is a gap between the rear side wall of the electrical box body and the rear shell of the housing. The right side wall of the electrical box body is closed. The right side wall of the electrical box body and the second air outlet are located on the same side.

9. The outdoor unit according to claim 8, characterized in that, The electrical box body is internally equipped with a main control board, a drive board, a reactor, and a fan. The main control board and the drive board are arranged at intervals along the length of the electrical box. The fan is located between the main control board and the drive board. The reactor is located between the main control board and the drive board and is located adjacent to the fan.

10. A multi-split water source unit, characterized in that, It includes an indoor unit, a water supply system, and an outdoor unit as described in any one of claims 1 to 9.

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