Composite fan and air conditioner

Abstract

The utility model discloses a composite fan and an air conditioner, the composite fan comprises a motor, a first volute and a second volute, and a centrifugal turbine is arranged in each of the first volute and the second volute. The combined fan further comprises a first volute side plate, a second volute side plate and an air duct surrounding piece, and the first volute side plate, the second volute side plate and the first volute form a first air outlet pipeline. The first volute side plate, the second volute side plate, the first volute, the second volute and the air duct surrounding piece form a second air outlet pipeline, the combined fan can achieve air volume superposition and enhancement, the air volume and air pressure are integrally enhanced, the cooling efficiency is improved, and the space utilization rate of a machine room can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning energy saving and emission reduction, and in particular to a composite fan and an air conditioner. Background Art

[0002] Existing air conditioners often cannot effectively deal with the problem of local overheating in 5G BBU equipment rooms, especially in hot seasons. The temperature in some local areas of some rooms may even exceed 45°C, which not only increases the risk of equipment downtime and network interruption, but also causes a significant increase in the operating power consumption of the BBU cabinet. This inefficient cooling mechanism not only affects the stable operation of the room, but also greatly increases the operating costs of operators.

[0003] The space limitation of the 5G BBU equipment room makes the installation of air conditioners extremely difficult. The distance between aisles is usually only 120cm, and the indoor unit needs to be placed on one side of the aisle or at a corner to ensure that it does not hinder the passage of maintenance personnel. This means that the floor space of the indoor unit is strictly limited, and the length and width should not exceed 40cm. This space limitation puts higher requirements on the design of the air conditioner.

[0004] In addition, the modern communications industry has strict standards for indoor noise in data centers, requiring it to not exceed 60dB. However, traditional air conditioners often have the problem of excessive noise in the fan design, which not only affects the working environment of the computer room, but may also be difficult to gain user recognition because it does not meet market demand. Utility Model Content

[0005] The purpose of the utility model is to provide a composite fan and air conditioner to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A composite fan comprises a motor, a first volute, and a second volute, wherein a centrifugal turbine is arranged in each of the first volute and the second volute, and characterized in that it also comprises a first volute side plate, a second volute side plate and an air duct enclosure, wherein the first volute side plate, the second volute side plate and the first volute form a first air outlet duct, and the first volute side plate, the second volute side plate, the second volute, the first volute and the air duct enclosure form a second air outlet duct;

[0008] The first air outlet duct and the second air outlet duct are superimposed to form a composite air outlet duct, the composite air outlet duct has a composite air outlet, the composite air outlet has a first air outlet and a second air outlet, the first air outlet is connected to the first air outlet duct, the second air outlet is connected to the second air outlet duct, and the air outlet directions of the first air outlet and the second air outlet are consistent.

[0009] Furthermore, the first air outlet of the first volute has a first air outlet upper plate and a first air outlet bottom plate, and the first air outlet is surrounded by the first volute side plate, the second volute side plate, the first air outlet upper plate and the first air outlet bottom plate; the second air outlet is surrounded by the first volute side plate, the second volute side plate, the first air outlet bottom plate and the air duct enclosure.

[0010] Optionally, the second air outlet is in an "L" shape.

[0011] Specifically, the air duct enclosure includes a first side plate of the air duct enclosure and a bottom plate of the air duct enclosure, and the first side plate of the air duct enclosure and the bottom plate of the air duct enclosure are vertically arranged.

[0012] Optionally, the composite air outlet is a square, and the composite air outlet satisfies the following size relationship:

[0013] L 1+ L 3= L 2+ L 4

[0014] in, L 1 is the design width of the first volute, that is, the distance between the first volute side plate and the second volute side plate; L 2 is the distance between the first air outlet upper plate and the first air outlet bottom plate; L 3 is the distance between the second volute side plate and the first side plate of the air duct enclosure; L 4 is the distance between the first air outlet bottom plate and the air duct enclosure bottom plate.

[0015] Optionally, the second air outlet is in a "concave" shape, and the air duct enclosure is in a "U" shape.

[0016] Specifically, the duct enclosure includes a second side panel of the duct enclosure, a third side panel of the duct enclosure and a bottom panel of the duct enclosure, the second side panel of the duct enclosure and the third side panel of the duct enclosure are arranged in parallel, and the second side panel of the duct enclosure and the third side panel of the duct enclosure are both arranged perpendicular to the bottom panel of the duct enclosure.

[0017] Optionally, the composite air outlet is a square, and the composite air outlet satisfies the following size relationship:

[0018] L 1+ L 5+ L 6= L 2+ L 4

[0019] Among them, among them, L 1 is the design width of the first volute, that is, the distance between the first volute side plate and the second volute side plate; L 2 is the distance between the first air outlet upper plate and the first air outlet bottom plate; L 4 is the distance between the first air outlet bottom plate and the air duct enclosure bottom plate; L 5 is the distance between the second side plate of the air duct enclosure and the first volute side plate; L 6 is the distance between the second volute side plate and the third side plate of the air duct enclosure.

[0020] Furthermore, it also includes a motor fixing part, the motor fixing part is provided with a center hole, the motor can be sleeved in the center hole, and the motor fixing part is fixedly connected to the second volute side plate.

[0021] An air conditioner comprises the above-mentioned composite fan.

[0022] Compared with the prior art, the composite fan has the following beneficial effects:

[0023] A unique composite air duct is formed by arranging the first volute, the second volute, the first volute side plate, the second volute side plate and the air duct surround. The two turbines are respectively installed in the first volute and the second volute, and the generated air volume can be gathered into one air outlet, so as to realize the superposition and enhancement of the air volume, so that the air volume and air pressure are enhanced as a whole, which not only improves the cooling efficiency, but also effectively improves the space utilization rate of the machine room and avoids the use of larger fans. By adopting a dual-turbine design, each turbine can work independently, and the dual-volute structure makes the airflow in the volute smoother, reduces the turbulence and impact of the airflow, and can effectively reduce the noise of the fan. The reasonable combination of the above components can enhance the structural stability and durability of the air duct, be able to withstand greater pressure and vibration, and reduce the occurrence of problems such as air leakage and breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0026] Figure 1 This is a schematic diagram of the structure of the first direction of the first embodiment of the composite fan of the utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the composite fan in the second direction of the first embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of the internal structure of the first embodiment of the composite fan of the utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the air duct enclosure of the first embodiment of the utility model;

[0030] Figure 5 for Figure 1 A partial enlarged schematic diagram of the composite fan A is shown;

[0031] Figure 6 This is a schematic diagram of the structure of the motor fixing member of the utility model;

[0032] Figure 7 This is a structural schematic diagram of a second embodiment of the composite fan of the utility model;

[0033] Figure 8 This is a schematic diagram of the structure of the air duct enclosure of the second embodiment of the utility model;

[0034] Fig. 9 for Figure 7 A partial enlarged schematic diagram of the composite fan B is shown;

[0035] In the figure: 1 motor, 2 first volute, 21 first air outlet upper plate, 22 first air outlet bottom plate, 3 second volute, 4 centrifugal turbine, 5 first volute side plate, 6 second volute side plate, 7 duct enclosure, 71 duct enclosure first side plate, 72 duct enclosure second side plate, 73 duct enclosure third side plate, 74 duct enclosure bottom plate, 8 first air outlet duct, 81 first air outlet, 9 second air outlet duct, 91 second air outlet, 10 air inlet, 11 motor fixing part, 12 flange structure, 13 center hole. DETAILED DESCRIPTION

[0036] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the embodiment described below is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0038] Embodiment 1

[0039] Fan structure

[0040] Please see attached Figure 1-Figure 3 The utility model provides a technical solution for a composite fan:

[0041] A composite fan includes a motor 1, a first volute 2, and a second volute 3. A centrifugal turbine 4 is arranged in each of the first volute 2 and the second volute 3. The fan also includes a first volute side plate 5, a second volute side plate 6 and an air duct enclosure 7. The first volute side plate 5, the second volute side plate 6 and the first volute 2 form a first air outlet duct 8. The first volute side plate 5, the second volute side plate 6, the first volute 2, the second volute 3 and the air duct enclosure 7 form a second air outlet duct 9.

[0042] By arranging a centrifugal turbine 4 in each of the first volute 2 and the second volute 3, and adding a first volute side panel 5, a second volute side panel 6 and an air duct enclosure 7 thereon, the composite fan can generate two independent air outlet ducts, and the air outlet effect of the composite fan is greatly enhanced. Since the composite fan adopts a dual-turbine design, each turbine can work independently, so the working efficiency is higher. The dual-volute structure makes the airflow in the volute more stable, reduces the turbulence and impact of the airflow, and can effectively reduce the noise of the fan.

[0043] The composite setting of two air outlet ducts can realize the superposition of air volume, that is, utilize two wind sources to act on one air outlet together, successfully increase the air volume, this setting makes the air outlet can deliver more cold air in the same time, thereby improving the cold air discharge efficiency; avoid using larger fan turbine and volute, improve the space utilization rate of indoor fan, through optimizing the structure of fan, while increasing air volume, also realize the increase of wind pressure, this means that fan can overcome greater resistance when delivering air, makes air flow out more smoothly.

[0044] Air volume superposition means that at the same time, more air can be delivered to the area that needs cooling through the air outlet, thereby improving the air circulation effect. While achieving efficient cooling, it also reduces dependence on larger fans, thereby saving valuable computer room space resources.

[0045] By setting two air inlets 10, see Figure 2 , more air can be introduced at the same time, thereby increasing the air flow speed in the vortex chamber, which helps the equipment to complete the same amount of work in a shorter time and improves the working efficiency of the fan. The setting of the two air inlets 10 can make the airflow more evenly distributed in the vortex chamber, avoiding the problem of excessive concentration or sparseness of airflow in certain areas, and reducing performance fluctuations caused by uneven airflow.

[0046] Composite air duct structure

[0047] See attached Figure 3-Figure 5 The first air outlet duct 8 and the second air outlet duct 9 are superimposed to form a composite air outlet duct, the composite air outlet duct has a composite air outlet, the composite air outlet has a first air outlet 81 and a second air outlet 91, the first air outlet 81 is connected to the first air outlet duct 8, the second air outlet 91 is connected to the second air outlet duct 9, the air outlet directions of the first air outlet 81 and the second air outlet 91 are consistent, and the composite air outlet is square.

[0048] The design of the composite air duct makes the air outlet more uniform and comprehensive, and can meet the air outlet needs of different areas. The two air outlets are independent of each other and do not affect each other, avoiding possible air flow turbulence problems and ensuring that the air volume output of each air outlet is stable and does not interfere with each other; the first air outlet and the second air outlet are in the same direction, which helps to ensure the consistency and stability of the air outlet. The two converge into a composite air outlet, and the air volume out of the air outlet can form a combined force; the composite air outlet is designed to be square, which not only makes the appearance more beautiful, but also facilitates installation and maintenance, and can effectively ensure the area of ​​the air outlet and improve the air outlet effect.

[0049] The number of air outlets can also be expanded to three or even four, and finally converged into a composite air outlet, and used in conjunction with a corresponding number of fans to achieve a combined output of air volume. This not only improves the air outlet effect, but also makes the air volume distribution more uniform. It can adapt to ventilation needs of different scales and provides flexible solutions for various application scenarios.

[0050] The first air outlet 81 of the first volute 2 has a first air outlet upper plate 21 and a first air outlet bottom plate 22, and the first air outlet 81 is surrounded by the first volute side plate 5, the second volute side plate 6, the first air outlet upper plate 21 and the first air outlet bottom plate 22; the second air outlet 91 is surrounded by the first volute side plate 5, the second volute side plate 6, the first air outlet bottom plate 22 and the air duct enclosure 7.

[0051] The design of the composite fan can significantly improve the fan's air outlet effect, ensuring that the airflow is fully mixed and evenly distributed inside the fan. Due to the optimization of the air outlet structure, the fan's noise and vibration are also effectively reduced, further improving the fan's comfort and stability. The formation of the composite channel helps to optimize the air flow performance. By reasonably designing the shape and size of the composite channel, the resistance to air flow can be reduced, thereby improving the operating efficiency and comfort of the entire system.

[0052] The air duct enclosure 7 has a flange structure 12, see Figure 4 The flange structure 12 can fit tightly in the enclosed space formed by the first volute side panel 5 and the second volute side panel 6. By adopting the air duct enclosure 7 with the flange structure 12, it can achieve a tight fit with the enclosed space formed between the first volute side panel 5 and the second volute side panel 6, prevent air leakage, and ensure the integrity and stability of the air duct. The close fit between the flange structure 12 and the second volute side panel 6 can effectively resist external forces and vibrations, reduce the shaking and deformation of the air duct, and maintain the long-term stable operation of the air duct. Screws can be used for fixed connection, which can ensure that the connection between the flange structure 12 of the air duct enclosure 7 and the volute side panel is firm and reliable, and can provide sufficient connection strength to ensure that the air duct enclosure 7 will not loosen or fall off during long-term use.

[0053] See also Figure 4-Figure 5 The air duct enclosure 7 includes a first side plate 71 of the air duct enclosure and a bottom plate 74 of the air duct enclosure, and the first side plate 71 of the air duct enclosure and the bottom plate 74 of the air duct enclosure are vertically arranged.

[0054] By means of the vertically arranged first side panel 71 of the duct enclosure and the bottom panel 74 of the duct enclosure, a stable and closed duct structure can be effectively formed to ensure the stability and uniformity of the airflow. The vertically arranged side panels and bottom panel also make the duct enclosure 7 more solid and stable, and able to withstand greater external pressure and vibration, thereby helping to reduce deformation and damage of the duct and improving the service life and reliability of the duct. The vertically arranged duct enclosure is also easy to install and maintain, and can be assembled and disassembled more conveniently, reducing the difficulty and cost of installation and maintenance.

[0055] The composite air outlet satisfies the following dimensional relationship:

[0056] L 1+ L 3= L 2+ L 4

[0057] Among them, see Figure 5 , L 1 is the design width of the first volute, that is, the horizontal distance between the first volute side plate 5 and the second volute side plate 6; L 2 is the distance between the first air outlet upper plate 21 and the first air outlet bottom plate 22; L 3 is the distance between the second volute side plate 6 and the first side plate 71 of the air duct enclosure; L 4 is the distance between the first air outlet bottom plate 22 and the air duct enclosure bottom plate 74.

[0058] By limiting the dimensional relationship of the composite air outlet, it is helpful to achieve uniform distribution of air volume. Due to the precise control between each distance, the airflow in the composite air outlet flows more smoothly, reducing the occurrence of eddies and turbulence, thereby ensuring the consistency and stability of the air outlet effect. The dimensional relationship also enhances the durability and reliability of the composite air outlet. Due to the close fit between the various components, the composite air outlet is not prone to loosening or deformation during long-term use, ensuring the sealing and durability of the air duct.

[0059] By setting four parameters reasonably L 1. L 2. L 3. L The value of 4 makes the area of ​​the first air outlet equal to the area of ​​the second air outlet, achieving the effect of air volume superposition and more uniform air discharge; in actual application, the value is: L 1 = 90 mm, L 2=80mm, L 3 = 30 mm, L 4=40mm. After calculation, the area of ​​the two air outlets is 720mm², which allows the airflow to be distributed more evenly when passing through the two air outlets, avoiding the problems of dead corners and uneven wind speed. It not only improves the air outlet effect, but also helps to improve the efficiency of the entire ventilation system.

[0060] The second air outlet 91 is in an "L" shape. Figure 1-Figure 5 .

[0061] Setting the second air outlet 91 into an "L" shape makes it easier to form a square composite air outlet with the rectangular first air outlet 81. The square composite air outlet design makes the air outlet more uniform and comprehensive; due to the change in the shape of the air outlet, the wind flow can be better dispersed and mixed when passing through the composite air outlet, avoiding the problems of dead corners and uneven wind speed; due to its simple shape and structure, the assembly and disassembly process of the air outlet becomes easier and faster, which not only reduces the cost of installation and maintenance, but also improves the convenience of operation.

[0062] Motor mounting structure

[0063] In this embodiment, the centrifugal turbine 4 of the composite fan is connected to the motor 1 through the motor shaft, which can ensure that the power output by the motor 1 can be accurately and efficiently transmitted to the centrifugal turbine 4. The power of the motor 1 is fully utilized, reducing the loss of energy during the transmission process and improving the energy transmission efficiency. At the same time, the rotation speed and stability of the centrifugal turbine 4 are also effectively guaranteed, thereby improving the operating efficiency and reliability of the entire device.

[0064] The composite fan also includes a motor fixing member 11, see Figure 6 The motor fixing member is provided with a center hole 13 , and the motor 1 can be sleeved in the center hole 13 . The motor fixing member 11 is fixedly connected to the second volute side plate 6 .

[0065] By providing the motor fixing part 11, the motor 1 can be effectively fixed at a specific position of the composite fan, thereby ensuring the stability and reliability of the motor 1. This fixing method is not only simple and easy, but also can effectively prevent the motor 1 from loosening or falling off during operation, thereby improving the overall stability and safety of the composite fan; the center hole 13 of the motor fixing part 11 allows the motor 1 to be conveniently inserted therein, thereby realizing the rapid connection and disassembly of the motor and the composite fan; the fixed connection between the motor fixing part 11 and the second volute side plate 6 further enhances the structural stability and overall rigidity of the composite fan. This connection method can effectively resist various forces and vibrations generated during the operation of the fan, thereby ensuring the long-term stable operation and good performance of the composite fan.

[0066] Embodiment 2

[0067] The difference between this embodiment and the first embodiment lies in the structure of the air duct enclosure.

[0068] See also Figure 7-Figure 8, the second air outlet 91 is in a "concave" shape, and the air duct enclosure 7 is in a "U" shape, including the second side plate 72 of the air duct enclosure, the third side plate 73 of the air duct enclosure, and the bottom plate 74 of the air duct enclosure. The second side plate 72 of the air duct enclosure is parallel to the third side plate 73 of the air duct enclosure, and the second side plate 72 of the air duct enclosure and the third side plate 73 of the air duct enclosure are perpendicular to the bottom plate 74 of the air duct enclosure. The second side plate 72 of the air duct enclosure, the third side plate 73 of the air duct enclosure, and the bottom plate 74 of the air duct enclosure form a U-shaped structure.

[0069] The vertical setting effectively avoids airflow turbulence and leakage in the air duct, allowing the airflow to pass more smoothly and improving the efficiency of the air duct. The vertically set side panels and bottom panels can also enhance the pressure resistance of the air duct enclosure. When facing external pressure or vibration, the vertical structure can reduce the deformation and distortion of the air duct, maintain the sealing and stability of the air duct, and help simplify the installation and maintenance process of the air duct. The vertically arranged components are easier to assemble and disassemble, reducing the difficulty of installation and maintenance.

[0070] The composite air outlet satisfies the following dimensional relationship:

[0071] L 1+ L 5+ L 6= L 2+ L 4

[0072] Among them, see Fig. 9 ,in, L 1 is the design width of the first volute, that is, the horizontal distance between the first volute side plate 5 and the second volute side plate 6; L 2 is the distance between the first air outlet upper plate 21 and the first air outlet bottom plate 22; L 4 is the distance between the first air outlet bottom plate 22 and the air duct enclosure bottom plate 74; L 5 is the distance between the second side plate 72 of the air duct enclosure and the first volute side plate 5; L 6 is the distance between the second volute side plate 6 and the third side plate 73 of the air duct enclosure.

[0073] The setting of this dimensional relationship ensures the structural stability and sealing of the composite air outlet. By precisely controlling each distance parameter, the composite air outlet can form a stable structure after assembly, reduce air leakage, and improve air outlet efficiency. This dimensional relationship helps to achieve uniform distribution of air volume; when the airflow passes through the composite air outlet, the airflow will be evenly distributed to each air outlet, avoiding the problem of excessive or insufficient air volume and improving the air outlet effect. This dimensional relationship also enhances the scalability and applicability of the composite air outlet. According to different application scenarios and requirements, the structure and performance of the composite air outlet can be optimized by adjusting the dimensional relationship to make it better adapt to various actual usage situations.

[0074] By setting five parameters reasonably L 1. L 2. L 4. L 5. L The value of 6 makes the area of ​​the first air outlet equal to the area of ​​the second air outlet, achieving the effect of air volume superposition and more uniform air discharge. In practical applications, the value is: L 1 = 90 mm, L 2=80mm, L 4 = 40 mm, L 5 = 15 mm, L 6=15mm. After calculation, the area of ​​the two air outlets is 720mm², which allows the airflow to be distributed more evenly when passing through the two air outlets, avoiding the problems of dead corners and uneven wind speed. It not only improves the air outlet effect, but also helps to improve the efficiency of the entire ventilation system.

[0075] The second air outlet 91 is in a concave shape. Figure 7-Figure 9 .

[0076] The "concave" shaped air outlet can better adapt to different installation environments and usage scenarios, providing greater flexibility. The design also helps to reduce wind flow eddies and turbulence, making the air output more uniform and stable.

[0077] Embodiment 3

[0078] The present embodiment relates to an air conditioner, including the above-mentioned composite fan. The composite air outlet design in the composite fan can converge the air volume of multiple air outlets into one air outlet to form a combined output, which not only improves the air outlet effect, but also reduces the noise and vibration of the fan, making the air conditioner quieter and more stable during operation.

[0079] As described above, the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A composite fan, comprising a motor, a first volute, and a second volute, wherein a centrifugal turbine is arranged in each of the first volute and the second volute, characterized in that: The first volute side plate, the second volute side plate and the air duct enclosure are also included, wherein the first volute side plate, the second volute side plate and the first volute form a first air outlet duct, and the first volute side plate, the second volute side plate, the second volute, the first volute and the air duct enclosure form a second air outlet duct; The first air outlet duct and the second air outlet duct are superimposed to form a composite air outlet duct, the composite air outlet duct has a composite air outlet, the composite air outlet has a first air outlet and a second air outlet, the first air outlet is connected to the first air outlet duct, the second air outlet is connected to the second air outlet duct, and the air outlet directions of the first air outlet and the second air outlet are consistent.

2. The composite fan according to claim 1, characterized in that: The first air outlet of the first volute has a first air outlet upper plate and a first air outlet bottom plate, and the first air outlet is surrounded by the first volute side plate, the second volute side plate, the first air outlet upper plate and the first air outlet bottom plate; the second air outlet is surrounded by the first volute side plate, the second volute side plate, the first air outlet bottom plate and the air duct enclosure.

3. The composite fan according to claim 2, characterized in that: The second air outlet is in an "L" shape, and the duct enclosure includes a first side plate of the duct enclosure and a bottom plate of the duct enclosure, and the first side plate of the duct enclosure and the bottom plate of the duct enclosure are vertically arranged.

4. The composite fan according to claim 3, characterized in that: The composite air outlet is a square, and the composite air outlet satisfies the following size relationship: L 1＋ L 3= L 2＋ L 4 in, L 1 is the design width of the first volute, that is, the distance between the first volute side plate and the second volute side plate; L 2 is the distance between the first air outlet upper plate and the first air outlet bottom plate; L 3 is the distance between the second volute side plate and the first side plate of the air duct enclosure; L 4 is the distance between the first air outlet bottom plate and the air duct enclosure bottom plate.

5. The composite fan according to claim 2, characterized in that: The second air outlet is in a "concave" shape, and the duct enclosure is in a "U" shape. The duct enclosure includes a second side panel of the duct enclosure, a third side panel of the duct enclosure and a bottom panel of the duct enclosure. The second side panel of the duct enclosure and the third side panel of the duct enclosure are arranged in parallel, and the second side panel of the duct enclosure and the third side panel of the duct enclosure are both perpendicular to the bottom panel of the duct enclosure.

6. The composite fan according to claim 5, characterized in that: The composite air outlet is a square, and the composite air outlet satisfies the following size relationship: L 1＋ L 5＋ L 6= L 2＋ L 4 Among them, among them, L 1 is the design width of the first volute, that is, the distance between the first volute side plate and the second volute side plate; L 2 is the distance between the first air outlet upper plate and the first air outlet bottom plate; L 4 is the distance between the first air outlet bottom plate and the air duct enclosure bottom plate; L 5 is the distance between the second side plate of the air duct enclosure and the first volute side plate; L 6 is the distance between the second volute side plate and the third side plate of the air duct enclosure.

7. The composite fan according to any one of claims 1 to 6, characterized in that: It also includes a motor fixing part, which is provided with a center hole, and the motor can be sleeved in the center hole. The motor fixing part is fixedly connected to the second volute side plate.

8. An air conditioner, characterized in that: The composite fan comprises any one of claims 1 to 7.

Images