A fan system and a refrigerated range hood using the fan system.

Abstract

This invention discloses a fan system and a refrigerated range hood using the fan system. The fan system includes a centrifugal fan, which includes a volute and an impeller disposed within the volute. An air inlet is formed on the volute. The fan system also includes a condenser, which includes an air inlet ring and an air inlet grille. The air inlet ring is disposed around the air inlet. The air inlet grille extends from the inner circumference of the air inlet ring along the axial direction of the centrifugal fan into the volute and into the impeller. The air inlet grille is generally hollow cylindrical. The air inlet grille includes grille bars extending along the axial direction of the centrifugal fan. There are at least two grille bars, which are arranged at intervals along the circumference of the centrifugal fan. The space between two adjacent grille bars forms a grille hole for airflow. Each grille bar has a hollow structure, and the hollow space within each grille bar directly forms a refrigerant channel for refrigerant to pass through.

Description

Technical Field

[0001] This invention relates to an oil fume purification device, and more particularly to a fan system and a refrigerated range hood using the fan system. Background Technology

[0002] As living standards improve, people have higher expectations for their kitchen environment. Cooking involves using stoves and other appliances, generating a significant amount of heat in the kitchen, which raises the overall temperature and reduces comfort. Currently, most families use temporary fans to solve this problem; however, this method is not only inconvenient but also takes up kitchen space.

[0003] Existing technologies already disclose range hoods with cooling functions, which can blow cool air from the hood casing to cool the kitchen. How to improve the heat dissipation of the condenser, thereby increasing the cooling efficiency, is a crucial problem that needs to be solved for such range hoods.

[0004] Existing range hoods with cooling functions include, for example, a range hood integrated stove air conditioning duct condenser structure disclosed in Chinese Patent Application No. 202110729564.9. This duct condenser has a unidirectional exhaust port and inlet. The inlet is equipped with a centrifugal fan interface and left and right exhaust centrifugal fans, while the exhaust port is equipped with an exhaust pipe interface. The duct condenser has multiple media channels on its inner side, extending to the outside of the duct condenser near the exhaust port to form a refrigerant inlet pipe. Another example is an integrated range hood and kitchen air conditioning system disclosed in Chinese Patent Application No. 202023265036.2, which includes an air conditioning component, a range hood component, and an oil fume filter. The air conditioning component includes a compressor, a first heat exchanger, and a second heat exchanger. The range hood component includes a range hood housing and a centrifugal fan. The range hood housing includes a fan casing and an exhaust pipe, with the centrifugal fan located inside the fan casing and the first heat exchanger covering the exhaust pipe.

[0005] This type of cooling range hood utilizes the airflow exhausted by the impeller of the fan system to dissipate heat from the condenser of the cooling component. With the condenser positioned at the rear, the airflow temperature at the outlet of the volute is T0. As the airflow reaches the middle of the condenser, its temperature rises to T1 due to heat exchange with the condenser. Starting from T1, the airflow temperature gradually increases to T2, avoiding further heat exchange with the condenser at the rear. In other words, the temperature difference between the inner wall of the condenser and the airflow temperature decreases along the airflow direction, resulting in progressively lower heat exchange efficiency.

[0006] Therefore, further improvements are needed. Summary of the Invention

[0007] The first technical problem to be solved by the present invention is to provide a fan system that improves the heat exchange uniformity of the condenser of the refrigeration component, extends the service life of the fan system, and saves space, in order to address the shortcomings of the prior art.

[0008] The second technical problem to be solved by the present invention is to provide a cooling and fume extraction system using the above-mentioned fan system.

[0009] The technical solution adopted by the present invention to solve the first technical problem mentioned above is as follows: a fan system, including a centrifugal fan, the centrifugal fan including a volute and an impeller disposed within the volute, the volute having an air inlet formed thereon; characterized in that:

[0010] The fan system also includes a condenser, which includes an air inlet ring and an air inlet grille. The air inlet ring is disposed around the air inlet. The air inlet grille extends from the inner circumference of the air inlet ring along the axial direction of the centrifugal fan into the volute and into the impeller. The air inlet grille is generally hollow cylindrical. The air inlet grille includes grille bars extending along the axial direction of the centrifugal fan. There are at least two grille bars, which are arranged at intervals along the circumference of the centrifugal fan. The space between two adjacent grille bars forms a grille hole for airflow. Each grille bar has a hollow structure, and the hollow space inside each grille bar directly forms a refrigerant channel for refrigerant to pass through.

[0011] By placing a condenser at the front of the impeller, the portion of the condenser inside the impeller is a cylindrical grille. When the fan system is working, the impeller rotates, and airflow enters from the inlet. The airflow impacts each grille bar perpendicularly, and is then split to both sides. The airflow enters the impeller through the grille holes 223 on the adjacent sides of the grille bar. Thus, the refrigerant channels within all the grille bars can be enveloped by the airflow for heat exchange. After the oil fume airflow entering from the inlet ring exchanges heat with the inlet ring and the grille bars, the entire condenser wall has a small temperature difference and uniform heat exchange. The pre-condenser can filter the dirt in the flue gas, purifying it. Compared to the complex structure of the impeller blades, cleaning the condenser is much easier than cleaning the impeller, thus extending the impeller's service life. The condenser is placed in the centrifugal fan, saving space in the refrigeration components used in the refrigeration flue gas system.

[0012] To facilitate the inflow and outflow of refrigerant, a refrigerant input channel and a refrigerant output channel are formed on the air inlet ring, and the refrigerant input channel and the refrigerant output channel are in fluid communication with the refrigerant channel inside each grille bar.

[0013] To facilitate the supply of refrigerant to each grille bar and its outflow after converging, the air inlet grille also includes a connecting part. The connecting part connects the ends of each grille bar away from the air inlet ring. A first annular converging channel is formed in the connecting part, and a second annular converging channel is formed in the air inlet ring. The first converging channel is in fluid communication with the refrigerant input channel through one of the grille bars, and the second converging channel is in fluid communication with the refrigerant output channel through the other grille bar.

[0014] Each grille bar is connected to the connecting part so that the corresponding refrigerant passage is in fluid communication with the first manifold; among each grille bar, except for the grille bar that is directly in fluid communication with the refrigerant input passage, the part is connected to the air inlet ring so that the corresponding refrigerant passage is in fluid communication with the second manifold.

[0015] Preferably, to avoid the refrigerant before and after heat exchange mixing and being disturbed, the grille has at least three bars. The end of each grille facing the connection is the first end, and the end of each grille facing the air inlet ring is the second end. The grille that is directly in fluid communication with the refrigerant input channel is designated as the first grille bar, and the grille that is directly in communication with the refrigerant output channel is designated as the second grille bar. The first grille bar and the second grille bar are arranged adjacent to each other, and the grille bar that is adjacent to the first grille bar is designated as the third grille bar. The first grille bar is located between the second grille bar and the third grille bar.

[0016] The first confluence channel forms a notch at the position corresponding to the first grid bar and the second grid bar, thereby connecting one end of the first confluence channel in the circumferential direction to the first end of the first grid bar and communicating with it in fluid. The other end of the first confluence channel in the circumferential direction is connected to the first end of the second grid bar and communicating with it in fluid. The first ends of the remaining grid bars are all connected to the first confluence channel and communicating with it in fluid.

[0017] The second confluence channel forms a gap at the corresponding position of the second and third grid bars, thereby connecting one end of the second confluence channel in the circumferential direction to the second end of the second grid bar and fluidly communicating with it, and connecting the other end of the second confluence channel in the circumferential direction to the second end of the third grid bar and fluidly communicating with it. The second ends of the remaining grid bars are all connected to the second confluence channel and fluidly communicating with it.

[0018] Preferably, in order to minimize the heat exchange path of the refrigerant and further improve the heat exchange efficiency, both the air inlet ring and the connecting part are made of thermally conductive material. The refrigerant input channel, the refrigerant output channel and the second confluence channel are all directly formed in the hollow space inside the air inlet ring, and the first confluence channel is directly formed in the hollow space inside the connecting part.

[0019] Furthermore, each grille bar includes a flange and a duct section, with the refrigerant channel formed within the duct section. Each grille bar has two flanges, each formed on one circumferential side of the duct section. The flanges extend from the wall of the duct section towards the impeller, and the extension direction of each flange coincides with the circumferential tangent direction of the air inlet grille at the flange. Due to the presence of the flanges, the airflow exhibits a wall-attachment effect, exchanging heat with the heat conducted through the flanges, thus improving heat exchange efficiency. Furthermore, the coincidence of the flanges with the circumferential tangent widens the air inlet channel, reducing airflow resistance and ensuring maximum ventilation.

[0020] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a refrigerated range hood, including a compressor and an evaporator, characterized in that: the refrigerated range hood further includes the fan system as described above, and the condenser of the fan system cooperates with the compressor and evaporator mentioned above.

[0021] Compared with the prior art, the advantages of the present invention are as follows: By placing a condenser at the front end of the impeller, the part of the condenser inside the impeller is a cylindrical grille. When the fan system is working, the impeller rotates, and the airflow enters from the air inlet. The airflow impacts each grille bar perpendicularly and is then split to both sides. The grille holes 223 on the adjacent sides of the grille bar enter the impeller. Thus, the refrigerant channels in all the grille bars can be enveloped by the airflow for heat exchange. After the oil fume airflow entering from the air inlet ring exchanges heat at the air inlet ring and the grille bars, the temperature difference of the entire condenser wall is small and the heat exchange is uniform. The pre-condenser can filter the dirt in the flue gas and purify the flue gas. Compared with the complex structure of the impeller blades, cleaning the condenser is much easier than cleaning the impeller, thereby extending the working life of the impeller. The condenser is placed in the centrifugal fan, saving the volume of the refrigeration components used in the refrigeration flue gas refrigeration system. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a fan system according to an embodiment of the present invention;

[0023] Figure 2 This is an exploded view of the fan system according to an embodiment of the present invention;

[0024] Figure 3 for Figure 2 A magnified schematic diagram of part I;

[0025] Figure 4 This is a three-dimensional structural sectional view (radial section) of the wind turbine system according to an embodiment of the present invention;

[0026] Figure 5 for Figure 4 A magnified schematic diagram of part II;

[0027] Figure 6This is a schematic diagram of the condenser of the fan system according to an embodiment of the present invention;

[0028] Figure 7 This is a cross-sectional view (radial section) of the condenser of the fan system according to an embodiment of the present invention;

[0029] Figure 8 for Figure 7 A magnified schematic diagram of part III;

[0030] Figure 9 This is a three-dimensional structural sectional view (radial section) of the condenser of the fan system according to an embodiment of the present invention;

[0031] Figure 10 for Figure 9 A magnified schematic diagram of part IV;

[0032] Figure 11 This is a three-dimensional structural sectional view (radial section) of the condenser of the fan system according to an embodiment of the present invention;

[0033] Figure 12 for Figure 11 A magnified view of part of V;

[0034] Figure 13 This is a schematic diagram of a refrigerated range hood according to an embodiment of the present invention;

[0035] Figure 14 This is a cross-sectional view of a refrigerated range hood according to an embodiment of the present invention. Detailed Implementation

[0036] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0038] See Figures 1-12 The diagram illustrates a fan system including a centrifugal fan 1. The centrifugal fan 1 includes a volute 11, an impeller 12 disposed within the volute 11, and a motor 13 for driving the impeller 12 to rotate. An air inlet 111 is formed on the volute 11. In this embodiment, the centrifugal fan 1 is a dual-inlet fan, with two air inlets 111 spaced apart along the axial direction of the centrifugal fan 1 on the cover plate of the volute 11. This structure is prior art and will not be described further here.

[0039] The fan system also includes a condenser 2, which is located at the air inlet 111 of the volute 11. This air inlet 111 is the main air inlet of the centrifugal fan 1, that is, the air inlet 111 on the side away from the motor 13. The condenser 2 and the volute 11 can be fixed together with screws.

[0040] See Figures 2-6 The condenser 2 includes an air inlet ring 21 and an air inlet grille 22. The air inlet ring 21 is located around the air inlet 111 and has the same structure and function as the air inlet ring of the existing centrifugal fan 1. The air inlet grille 22 extends from the inner circumference of the air inlet ring 21 along the axial direction of the centrifugal fan 1 into the interior of the volute 11, until it enters the interior of the impeller 12. The air inlet grille 22 is a hollow cylindrical shape with a diameter smaller than the inner diameter of the impeller 12 to facilitate entry into the impeller 12. The air inlet grille 22 includes grille bars 221 extending along the axial direction of the centrifugal fan 1. There are at least two grille bars 221, which are arranged at intervals along the circumference of the centrifugal fan 1. The space between two adjacent grille bars 221 forms a grille hole 223. Each grille bar 221 is made of a thermally conductive material and has a hollow structure, with its hollow space directly forming a refrigerant channel 222.

[0041] In addition, see Figure 7 and Figure 8 Each grille bar 221 includes a flange 2214 and a duct section 2215. The duct section 2215 is a hollow cylinder, and the aforementioned refrigerant channel 222 is formed inside the duct section 2215. Each grille bar 221 has two flanges 2214, which are formed on both circumferential sides of the duct section 2215 and extend from the wall of the duct section 2215 toward the impeller 12. On the same radial section (a plane perpendicular to the axial direction of the centrifugal fan 1), the extension direction of each flange 2214 coincides with the circumferential tangent direction of the air inlet grille 22 at the flange 2214. Due to the presence of the flange 2214, the airflow has a wall adhesion effect and exchanges heat with the heat conducted by the flange 2214, thereby improving the heat exchange efficiency. If the flange 2214 does not coincide with the circumferential tangent, the width of the channel between the two grille bars 221 will inevitably decrease due to the angle of inclination between the flange 2214 and the circumferential tangent, increasing the air intake resistance and thus affecting the airflow between the grille bars 221.

[0042] A refrigerant input channel 211 and a refrigerant output channel 212 can be formed on the air inlet ring 21, each of which is in fluid communication with the refrigerant channel 222 inside each grille bar 221. In this embodiment, the specific communication method is that the air inlet grille 22 also includes a connecting part 224 with a circular cross-section, which can be a plate, connecting the ends of each grille bar 221 away from the air inlet ring 21. Combined with... Figures 9-12 The air inlet ring 21 and the connecting portion 224 are also made of thermally conductive material. A circular space is formed inside the connecting portion 224, which directly constitutes the first confluence channel 225 (i.e., no pipe is set inside the connecting portion 224 to form a channel). A circular space is formed inside the air inlet ring 21, which directly constitutes the second confluence channel 213 (i.e., no pipe is set inside the air inlet ring 21 to form a channel). The end of each grille strip 221 facing the connecting portion 224 is designated as the first end, and the end of each grille strip 221 facing the air inlet ring 21 is designated as the second end. The grille bar 221 that is directly connected to the refrigerant input channel 211 is designated as the first grille bar 2211, and the grille bar 221 that is directly connected to the refrigerant output channel 212 is designated as the second grille bar 2212. The first grille bar 2211 and the second grille bar 2212 are arranged adjacent to each other, and the grille bar 221 that is adjacent to the first grille bar 2211 is designated as the third grille bar 2213. The first grille bar 2211 is located between the second grille bar 2212 and the third grille bar 2213. The first manifold channel 225 is not a closed annulus. It has gaps at the corresponding positions of the first grille bar 2211 and the second grille bar 2212. That is, one end of the first manifold channel 225 in the circumferential direction is connected to the first end of the first grille bar 2211 and is in fluid communication. The other end of the first manifold channel 225 in the circumferential direction is connected to the first end of the second grille bar 2212 and is in fluid communication. The first ends of the remaining grille bars 221 are all connected to the first manifold channel 225 and are in fluid communication. This ensures that after the refrigerant flows out from the first grille bar 2211, it flows through the entire first manifold channel 225 before flowing out from the second grille bar 2212. The second confluence channel 213 is not a closed annular shape. It forms a gap at the corresponding position of the second grid bar 2212 and the third grid bar 2213. That is, one end of the second confluence channel 213 in the circumferential direction is connected to the second end of the second grid bar 2212 and is in fluid communication. The other end of the second confluence channel 213 in the circumferential direction is connected to the second end of the third grid bar 2213 and is in fluid communication. The second ends of the remaining grid bars 221 are all connected to the second confluence channel 213 and are in fluid communication.

[0043] Therefore, see Figure 10When the refrigerant enters the first grille bar 2211 from the refrigerant inlet channel 211, it flows out from the first end of the first grille bar 2211 and enters the first manifold channel 225. Thereafter, some refrigerant flows directly along the first manifold channel 225 until it reaches the first end of the second grille bar 2212, and then flows along the second grille bar 2212 to the refrigerant outlet channel 212. Meanwhile, some refrigerant flows along the first manifold channel 225 into the grille bars 221 other than the first grille bar 2211 and the second grille bar 2212, and enters the second manifold channel 213 from the second end of these grille bars 221. Then it flows along the second manifold channel 213 until it reaches the first end of the second grille bar 2212, and then flows to the refrigerant outlet channel 212.

[0044] The channels through which the refrigerant passes (including the refrigerant inflow and outflow channels within the air inlet ring 21, the second confluence channel 213 within the air inlet ring 21, the refrigerant channel 222 within the grille strip, and the first confluence channel 225 within the connecting part 224) are directly formed within the internal space of the heat-conducting material. Optionally, the heat-conducting material used to make the air inlet grille 22 is a metal plate, preferably an aluminum plate. The air inlet ring 21, grille strip 221, and connecting part 224 can all be made by hot-rolling two aluminum plates, forming channels for the refrigerant to pass through between the two aluminum plates through processes such as blowing or wire cutting. After hot rolling, the refrigerant in the channels can withstand pressures up to 2.3 MPa, and there is zero-gap contact between the refrigerant and the heat-conducting plates (the refrigerant channels do not require other fittings to form, but are directly formed between the two layers of heat-conducting plates), resulting in extremely high heat exchange efficiency. Therefore, under natural conditions, the condenser surface temperature does not exceed 50°C. In existing air conditioners, the finned or wound type commonly used in the background technology cannot achieve a completely seamless fit between the refrigerant and the heat-conducting material. Therefore, heat transfer is not smooth, resulting in a high temperature of the condenser itself, which in turn affects the overall cooling effect of the refrigeration components.

[0045] When the fan system is working, the impeller 12 rotates, and airflow enters from the inlet 111. The airflow impacts each grille bar 221 perpendicularly, and is then split to both sides. Airflow enters the impeller 12 through the grille holes 223 on the adjacent sides of the grille bar 221, thus allowing all refrigerant passages 222 to be enveloped by the airflow for heat exchange. The temperature of the oil fume airflow entering from the inlet ring 21 is uniformly T0. After heat exchange at the inlet ring 21, the temperature of the airflow after passing through the grille holes 223 is uniformly T1. The temperature difference for heat exchange across the entire condenser wall is T = T1 - T0.

[0046] By placing a condenser 2 in front of the impeller 12, the pre-condenser 2 can filter out impurities in the flue gas and purify it. Compared to the complex structure of the impeller 12 blades, cleaning the condenser 2 is much easier than cleaning the impeller 12.

[0047] See Figure 13 and Figure 14 This illustration shows a range hood using the aforementioned fan system, comprising a fume extraction component and a cooling component. The fume extraction component includes a first housing 100, and the cooling component includes a second housing 200 disposed above the first housing 100. The aforementioned fan system is disposed within the first housing 100 to extract and exhaust fumes. The cooling component further includes a compressor 201 and an evaporator 202 disposed within the second housing 200. The cooperation between the compressor 201, evaporator 202, and condenser 2 is the same as in the prior art, and the outlet for the cold air after heat exchange with the evaporator 202 can be selected as needed.

[0048] The overall form of a range hood is not limited to Figure 13 and Figure 14 As shown, it can also adopt any other form in the existing technology.

[0049] The term "fluid connectivity" as used in this invention refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. This third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A fan system comprising a centrifugal fan (1), the centrifugal fan (1) comprising a volute (11) and an impeller (12) disposed within the volute (11), wherein an air inlet (111) is formed on the volute (11); characterized in that: The fan system also includes a condenser (2), which includes an air inlet ring (21) and an air inlet grille (22). The air inlet ring (21) is located around the air inlet (111). The air inlet grille (22) extends from the inner circumference of the air inlet ring (21) along the axial direction of the centrifugal fan (1) into the volute (11) and into the impeller (12). The air inlet grille (22) is a hollow cylindrical shape. The air inlet grille (22) includes grille bars (221) extending along the axial direction of the centrifugal fan (1). There are at least two grille bars (221) and they are arranged at intervals along the circumference of the centrifugal fan (1). The space between two adjacent grille bars (221) forms a grille hole (223) for airflow. Each grille bar (221) has a hollow structure, and the hollow space inside each grille bar (221) directly forms a refrigerant channel (222) for refrigerant to pass through.

2. The fan system according to claim 1, characterized in that: The air inlet ring (21) forms a refrigerant input channel (211) and a refrigerant output channel (212), which are in fluid communication with the refrigerant channel (222) inside each grille bar (221).

3. The fan system according to claim 2, characterized in that: The air inlet grille (22) further includes a connecting part (224), which connects the ends of each grille bar (221) of the air inlet grille (22) away from the air inlet ring (21). A first annular confluence channel (225) is formed in the connecting part (224), and a second annular confluence channel (213) is formed in the air inlet ring (21). The first confluence channel (225) is in fluid communication with the refrigerant input channel (211) through one of the grille bars (221), and the second confluence channel (213) is in fluid communication with the refrigerant output channel (212) through the other grille bar (221). Each grille bar (221) is connected to the connecting part (224) so ​​that the corresponding refrigerant passage (222) is in fluid communication with the first confluence channel (225); among each grille bar (221), except for the grille bar (221) that is directly in fluid communication with the refrigerant input passage (211), the part is connected to the air inlet ring (21) so that the corresponding refrigerant passage (222) is in fluid communication with the second confluence channel (213).

4. The fan system according to claim 3, characterized in that: The grille bar (221) has at least three, with one end of each grille bar (221) facing the connecting part (224) as the first end and one end of each grille bar (221) facing the air inlet ring (21) as the second end. The grille bar (221) that is directly fluidly connected to the refrigerant input channel (211) is designated as the first grille bar (2211), and the grille bar (221) that is directly connected to the refrigerant output channel (212) is designated as the second grille bar (2212). The first grille bar (2211) and the second grille bar (2212) are arranged adjacent to each other, and the grille bar (221) that is arranged adjacent to the first grille bar (2211) is designated as the third grille bar (2213). The first grille bar (2211) is located between the second grille bar (2212) and the third grille bar (2213). The first confluence channel (225) forms a notch at the corresponding position of the first grid bar (2211) and the second grid bar (2212), thereby connecting one end of the first confluence channel (225) in the circumferential direction to the first end of the first grid bar (2211) and communicating fluidly, and connecting the other end of the first confluence channel (225) in the circumferential direction to the first end of the second grid bar (2212) and communicating fluidly, and connecting the first ends of the remaining grid bars (221) to the first confluence channel (225) and communicating fluidly. The second confluence channel (213) forms a notch at the corresponding position of the second grid bar (2212) and the third grid bar (2213), thereby connecting one end of the second confluence channel (213) in the circumferential direction to the second end of the second grid bar (2212) and fluidly communicating with it, and connecting the other end of the second confluence channel (213) in the circumferential direction to the second end of the third grid bar (2213) and fluidly communicating with it. The second ends of the remaining grid bars (221) are all connected to the second confluence channel (213) and fluidly communicating with it.

5. The fan system according to claim 3 or 4, characterized in that: The air inlet ring (21) and the connecting part (224) are both made of thermally conductive material. The refrigerant input channel (211), the refrigerant output channel (212) and the second confluence channel (213) are all directly formed in the hollow space inside the air inlet ring (21). The first confluence channel (225) is directly formed in the hollow space inside the connecting part (224).

6. The fan system according to any one of claims 1 to 4, characterized in that: Each grille bar (221) includes a flange (2214) and a duct section (2215), wherein the refrigerant passage (222) is formed within the duct section (2215). Each grille bar (221) has two flanges (2214) and is formed on both circumferential sides of the duct section (2215). The flanges (2214) extend from the wall of the duct section (2215) toward the impeller (12). The extension direction of each flange (2214) coincides with the circumferential tangent direction of the air inlet grille (22) at the flange (2214).

7. A refrigerated range hood, comprising a compressor (201) and an evaporator (202), characterized in that: The refrigerated range hood further includes a fan system as described in any one of claims 1 to 6, wherein the condenser (2) of the fan system is in conjunction with the compressor (201) and evaporator (202) described above.

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