Fan system and refrigeration range hood applying same

Abstract

The invention discloses a fan system and a refrigeration range hood with the fan system.The fan system comprises a centrifugal fan, the centrifugal fan comprises a volute and an impeller arranged in the volute, and an air inlet is formed in the volute; the fan system further comprises a condenser, the condenser comprises an air inlet ring and an air inlet grille, the air inlet ring is arranged on the periphery of the air inlet, the air inlet grille extends into the volute from the inner periphery of the air inlet ring in the axial direction of the centrifugal fan and extends into the impeller, and the air inlet grille is integrally in a hollow cylinder shape. The air inlet grille comprises grille strips extending in the axial direction of the centrifugal fan, the number of the grille strips is at least two, the grille strips are arranged in the circumferential direction of the centrifugal fan at intervals, the space between every two adjacent grille strips forms a grille hole for airflow to pass through, and each grille strip is of a hollow structure. And the hollow space in each grating bar directly forms a refrigerant channel through which a refrigerant passes.

Description

Technical Field

[0001] The invention relates to an oil fume purification device, in particular to a fan system and a refrigeration range hood using the fan system. Background Art

[0002] With the improvement of material living standards, people have higher and higher requirements for kitchen environment. People need to use stoves during cooking, which will generate a lot of heat in the kitchen, causing the temperature of the entire space to rise and the comfort of the environment to decrease. At present, most families use temporary fans to solve this problem. However, this method is not only inconvenient, but also occupies kitchen area.

[0003] In the prior art, there are disclosed range hoods with cooling function, which can blow cold air from the housing of the range hood to cool down the kitchen. How to improve the heat dissipation effect of the condenser and thus improve the cooling efficiency is an important problem to be solved for such range hoods.

[0004] Existing range hoods with refrigeration function, such as a range hood integrated stove air-conditioning flue condenser structure disclosed in Chinese patent application number 202110729564.9, the flue condenser has a one-way discharge port and an inlet, the inlet is provided with a centrifugal fan interface and left and right smoke extraction centrifugal fans, the discharge port is provided with a discharge pipe interface, and the flue condenser is provided with multiple medium channels on the inside, and the medium channels extend to the outside of the flue condenser near the discharge port to form a refrigerant inlet pipe; another example is an integrated range hood and kitchen air-conditioning system disclosed in Chinese patent application number 202023265036.2, including an air-conditioning component, a range hood component and an oil fume filtering device; 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 volute and an exhaust pipe, the centrifugal fan is arranged in the fan volute, and the first heat exchanger is covered outside the exhaust pipe.

[0005] The above-mentioned refrigeration range hood uses the airflow discharged by the impeller of the fan system of the range hood to dissipate the heat of the condenser of the refrigeration component. In the case of a rear-mounted condenser, the temperature of the volute outlet is T0. When the airflow reaches the middle of the condenser, the airflow temperature rises to T1 due to the heat exchange between the previous section and the condenser. Then, with T1 as the starting temperature, the heat exchange is avoided for the rear section condenser, and the airflow temperature rises to T2 in turn. In other words, the temperature difference between the inner wall temperature of the condenser and the airflow temperature along the airflow direction becomes smaller and smaller, and the heat exchange efficiency becomes worse and worse.

[0006] Therefore, there is room for further improvement. Summary of the invention

[0007] The first technical problem to be solved by the present invention is to provide a fan system to improve the heat exchange uniformity of the condenser of the refrigeration component, extend the service life of the fan system, and save space in view of the deficiencies in the above-mentioned prior art.

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

[0009] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a fan system, including a centrifugal fan, the centrifugal fan including a volute and an impeller arranged in the volute, and an air inlet is formed on the volute; 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 arranged around the air inlet, and the air inlet grille extends from the inner periphery of the air inlet ring along the axial direction of the centrifugal fan into the volute and extends to the inside of the impeller. The air inlet grille is generally hollow cylindrical, and includes grille bars extending along the axial direction of the centrifugal fan. The grille bars have at least two and are arranged at intervals along the circumference of the centrifugal fan. The space between two adjacent grille bars constitutes a grille hole for air flow to pass through. Each grille bar is a hollow structure, and the hollow space in each grille bar directly constitutes a refrigerant channel for refrigerant to pass through.

[0011] By placing a condenser in the front section 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 hits each grille bar vertically, and then is diverted to both sides. The grille holes 223 on the adjacent sides of the grille bar in the circumferential direction enter the impeller, so that the refrigerant channels in all the grille bars can be wrapped by the airflow for heat exchange. After the oil fume airflow entering from the air inlet circle exchanges heat at the air inlet circle and the grille bars, the heat exchange temperature difference of the entire condenser wall is small and the heat exchange is uniform. The front condenser can filter the stains in the flue gas and purify the flue gas. Compared with the complex structure of the impeller blades, the difficulty of cleaning the condenser is much lower than that of cleaning the impeller, thereby extending the working life of the impeller. The condenser is placed in front and placed in the centrifugal fan, which saves the volume of the refrigeration component used in the refrigeration hood.

[0012] In order 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 both connected to the refrigerant channel fluid inside each grille bar.

[0013] In order to facilitate the supply of refrigerant to each grille bar and outflow after confluence, the air inlet grille also includes a connecting portion, the connecting portion connects the ends of each grille bar of the air inlet grille away from the air inlet ring, a first annular confluence channel is formed in the connecting portion, and a second annular confluence channel is formed in the air inlet ring. The first confluence channel is fluidly connected to the refrigerant input channel through one of the grille bars, and the second confluence channel is fluidly connected to the refrigerant output channel through another grille bar;

[0014] Each grille bar is connected to the connection part so that the corresponding refrigerant channel is fluidly connected to the first confluence channel; among each grille bar, except for the grille bar directly connected to the refrigerant input channel fluid, the part is connected to the air inlet ring so that the corresponding refrigerant channel is fluidly connected to the second confluence channel.

[0015] Preferably, in order to avoid the refrigerants before and after heat exchange from being mixed and disturbed, the grille bars have at least three, one end of each grille bar facing the connection portion is the first end, and one end of each grille bar facing the air inlet ring is the second end, the grille bar directly connected to the refrigerant input channel is marked as the first grille bar, the grille bar directly connected to the refrigerant output channel is marked as the second grille bar, the first grille bar and the second grille bar are adjacently arranged, the grille bar adjacent to the first grille bar is marked as the third grille bar, and the first grille bar is located between the second grille bar and the third grille bar;

[0016] The first bus channel is formed with a notch at a position corresponding to the first grid bar and the second grid bar, so that one end of the first bus channel in the circumferential direction is connected to the first end of the first grid bar and is in fluid communication, the other end of the first bus channel in the circumferential direction is connected to the first end of the second grid bar and is in fluid communication, and the first ends of the remaining grid bars are all connected to the first bus channel and are in fluid communication;

[0017] The second bus channel forms a notch at positions corresponding to the second grid bar and the third grid bar, whereby one end of the second bus channel in the circumferential direction is connected to the second end of the second grid bar and is fluidically connected, the other end of the second bus channel in the circumferential direction is connected to the second end of the third grid bar and is fluidically connected, and the second ends of the remaining grid bars are all connected to the second bus channel and are fluidically connected.

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

[0019] Furthermore, each grille bar includes a flange and a pipe part, the refrigerant channel is formed in the pipe part, each grille bar has two flanges and are respectively formed on both sides of the circumference of the pipe part, the flanges extend from the wall surface of the pipe part toward the impeller, and the extension direction of each flange coincides with the circumferential tangent direction of the air inlet grille at the flange. The air flow has a wall attachment effect due to the existence of the flange, and exchanges heat with the heat conduction of the flange, thereby improving the heat exchange efficiency, and the flange coincides with the circumferential tangent, expanding the width of the air inlet channel, reducing the air inlet resistance, and ensuring the maximum ventilation volume.

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

[0021] Compared with the prior art, the advantages of the present invention are: by placing a condenser at the front section of the impeller, the part of the condenser inside the impeller is a cylindrical grille, when the fan system is working, the impeller rotates, the airflow enters from the air inlet, and the airflow hits the grille bar vertically at each grille bar, and then is diverted to both sides, and enters the impeller from the grille holes 223 on the adjacent sides of the grille bar in the circumferential direction, so that the refrigerant channels in all the grille bars can be wrapped by the airflow for heat exchange, and after the oil fume airflow entering from the air inlet circle exchanges heat at the air inlet circle and the grille bar, the heat exchange temperature difference of the entire condenser wall is small and the heat exchange is uniform; the pre-condenser can filter the stains in the smoke and purify the smoke. Compared with the complex structure of the impeller blades, the difficulty of cleaning the condenser is much lower than that of cleaning the impeller, thereby extending the working life of the impeller; the condenser is placed in front and placed in the centrifugal fan, which saves the volume of the refrigeration component used in the refrigeration smoke machine. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 A schematic diagram of the exploded structure of a fan system according to an embodiment of the present invention;

[0024] Figure 3 for Figure 2 A schematic diagram of the partial enlargement of Ⅰ;

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

[0026] Figure 5 for Figure 4 A partial II enlarged schematic diagram of

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

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

[0029] Figure 8 for Figure 7 A partial III enlarged schematic diagram of

[0030] Fig. 9 A three-dimensional structural cross-sectional view (radial cross-section) of a condenser of a fan system according to an embodiment of the present invention;

[0031] Fig.10 for Fig. 9 A partial enlarged schematic diagram of Ⅳ;

[0032] Fig.11 A three-dimensional structural cross-sectional view (radial cross-section) of a condenser of a fan system according to an embodiment of the present invention;

[0033] Fig.12 for Fig.11 A partial enlarged schematic diagram of FIG.

[0034] Fig.13 is a schematic diagram of a refrigeration range hood according to an embodiment of the present invention;

[0035] Fig.14 It is a cross-sectional view of a refrigeration range hood according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0038] See also Figures 1 to 12 , shows a fan system, which includes a centrifugal fan 1, the centrifugal fan 1 includes a volute 11, an impeller 12 arranged in 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 double-inlet fan, and there are two air inlets 111, which are arranged on the cover plate of the volute 11 at intervals along the axial direction of the centrifugal fan 1. The above structure is a prior art and will not be repeated here.

[0039] The fan system further includes a condenser 2, which is disposed at an air inlet 111 of the volute 11. The air inlet 111 is a main air inlet of the centrifugal fan 1, that is, an air inlet 111 away from the motor 13. The condenser 2 and the volute 11 can be fixed by screws.

[0040] See also Figure 2 to Figure 6 The condenser 2 includes an air inlet ring 21 and an air inlet grille 22, wherein the air inlet ring 21 is arranged around the air inlet 111, and has the same structure and function as the air inlet ring of the centrifugal fan 1 in the prior art. The air inlet grille 22 extends from the inner periphery of the air inlet ring 21 along the axial direction of the centrifugal fan 1 to the inside of the volute 11 until it enters the inside of the impeller 12. The air inlet grille 22 is in the shape of a hollow cylinder as a whole, and its diameter is smaller than the inner diameter of the impeller 12 so as to enter the impeller 12. The air inlet grille 22 includes grille bars 221 extending along the axial direction of the centrifugal fan 1, and the grille bars 221 have at least two and are arranged at intervals along the circumference of the centrifugal fan 1. The space between two adjacent grille bars 221 constitutes a grille hole 223. Each grille bar 221 is made of a heat-conducting material and has a hollow structure, and the hollow space therein directly constitutes a refrigerant channel 222.

[0041] In addition, see Figure 7 and Figure 8 Each grille bar 221 includes a flange 2214 and a pipe portion 2215. The pipe portion 2215 is in a hollow cylindrical shape, and the above-mentioned refrigerant channel 222 is formed in the pipe portion 2215. Each grille bar 221 has two flanges 2214, which are respectively formed on both sides of the circumference of the pipe portion 2215, and extend from the wall surface of the pipe portion 2215 toward the impeller 12. On the same radial cross section (a plane perpendicular to the axial direction of the centrifugal fan 1), the extension direction of each flange 2214 coincides with the tangent direction of the circumference of the air inlet grille 22 at the flange 2214. The air flow has a wall attachment effect due to the existence of the flange 2214, and exchanges heat with the heat conduction of the flange 2214, thereby improving the heat exchange efficiency. If the flange 2214 does not coincide with the circumferential tangent, the channel width between the two grille bars 221 will inevitably decrease due to the inclination angle between the flange 2214 and the circumferential tangent, increasing the air intake resistance and thus affecting the air volume between the grille bars 221.

[0042] A refrigerant input channel 211 and a refrigerant output channel 212 may 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 portion 224 with a circular cross-section, which may be a plate, connecting the ends of the grille bars 221 of the air inlet grille 22 away from the air inlet ring 21. Figures 9 to 12 The air inlet ring 21 and the connecting portion 224 are also made of heat-conducting materials. A circular space is formed in the connecting portion 224, which directly constitutes the first confluence channel 225 (i.e., no pipe is provided in the connecting portion 224 to form a channel). A circular space is formed in the air inlet ring 21, which directly constitutes the second confluence channel 213 (i.e., no pipe is provided in the air inlet ring 21 to form a channel). The end of each grille bar 221 facing the connecting portion 224 is the first end, and the end of each grille bar 221 facing the air inlet ring 21 is the second end. The grille bar 221 directly connected to the refrigerant input channel 211 is recorded as the first grille bar 2211, the grille bar 221 directly connected to the refrigerant output channel 212 is recorded as the second grille bar 2212, the first grille bar 2211 and the second grille bar 2212 are arranged adjacent to each other, the grille bar 221 arranged adjacent to the first grille bar 2211 is recorded as the third grille bar 2213, and the first grille bar 2211 is located between the second grille bar 2212 and the third grille bar 2213. The first convergence channel 225 is not a closed circular ring, and a gap is formed at the position corresponding to the first grid bar 2211 and the second grid bar 2212, that is, one end of the first convergence channel 225 in the circumferential direction is connected to the first end of the first grid bar 2211 and is fluidly connected, and the other end of the first convergence channel 225 in the circumferential direction is connected to the first end of the second grid bar 2212 and is fluidly connected, and the first ends of the remaining grid bars 221 are all connected to the first convergence channel 225 and are fluidly connected, so that after the refrigerant flows out from the first grid bar 2211, it is ensured that it passes through the entire first convergence channel 225 before flowing out from the second grid bar 2212. The second convergence channel 213 is not a closed circular ring shape, and a gap is formed at the corresponding positions of the second grid bar 2212 and the third grid bar 2213, that is, one end of the second convergence channel 213 in the circumferential direction is connected to the second end of the second grid bar 2212 and is fluidically connected, and the other end of the second convergence channel 213 in the circumferential direction is connected to the second end of the third grid bar 2213 and is fluidically connected, and the second ends of the remaining grid bars 221 are all connected to the second convergence channel 213 and are fluidically connected.

[0043] Hence, see Fig.10When the refrigerant enters the first grid bar 2211 from the refrigerant input channel 211, it flows out from the first end of the first grid bar 2211 and enters the first confluence channel 225. After that, part of the refrigerant flows directly along the first confluence channel 225 until it reaches the first end of the second grid bar 2212, and then flows along the second grid bar 2212 to the refrigerant output channel 212; while part of the refrigerant enters the grid bars 221 other than the first grid bar 2211 and the second grid bar 2212 along the first confluence channel 225, and enters the second confluence channel 213 from the second ends of these grid bars 221, and then flows along the second confluence channel 213 until it reaches the first end of the second grid bar 2212, and then flows to the refrigerant output channel 212.

[0044] The channels through which the above-mentioned refrigerants pass (including the channels for the refrigerant to flow in and out in the air inlet ring 21, the second confluence channel 213 in the air inlet ring 21, the refrigerant channel 222 in the grid bar, and the first confluence channel 225 in the connecting portion 224) are directly formed by the internal space of the heat-conducting material. Optionally, the heat-conducting material used to make the air inlet duct grid 22 is a metal plate, such as an aluminum plate. The air inlet ring 21, the grid bar 221 and the connecting portion 224 can all be made in the following manner: two pieces of aluminum plates are hot-rolled and pressed, and a channel for the refrigerant to pass through is formed between the two pieces of aluminum plates by processes such as inflation or wire cutting. After hot rolling, the refrigerant in the channel can withstand a pressure of up to 2.3MPa, and there is zero gap contact between the refrigerant and the heat-conducting plate (the refrigerant channel does not need other pipes to form, but is directly formed between the two layers of heat-conducting plates), and the heat exchange efficiency is extremely high, so the surface temperature of the condenser is not higher than 50°C under natural conditions. However, in the fin-type or winding-type air conditioners commonly used in existing air conditioners, the refrigerant and the heat-conducting material cannot be completely matched without gaps, so the 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 component.

[0045] When the fan system is working, the impeller 12 rotates, and the airflow enters from the air inlet 111. The airflow hits the grid bar 221 vertically, and then is diverted to both sides, and enters the impeller 12 from the grid holes 223 on both sides of the grid bar 221 in the circumferential direction, so that all the refrigerant channels 222 can be wrapped by the airflow for heat exchange. The temperature of the oil smoke airflow entering from the air inlet circle 21 is unified to T0. After heat exchange at the air inlet circle 21, the temperature of the airflow after passing through the grid holes 223 is unified to T1, and the heat exchange temperature difference of the entire condenser wall is T=T1-T0.

[0046] By placing the condenser 2 in front of the impeller 12, the pre-condenser 2 can filter the dirt in the smoke and purify the smoke. Compared with the complex structure of the impeller 12 blades, the difficulty of cleaning the condenser 2 is much lower than that of cleaning the impeller 12.

[0047] See also Fig.13 and Fig.14 , shows a range hood using the above-mentioned fan system, which includes a fume suction component and a refrigeration component, wherein the fume suction component includes a first shell 100, and the refrigeration component includes a second shell 200 arranged on the first shell 100, and the above-mentioned fan system is arranged in the first shell 100 to suck in and discharge the fume. The refrigeration component also includes a compressor 201 and an evaporator 202 arranged in the second shell 200, and the cooperation between the compressor 201, the evaporator 202 and the condenser 2 is the same as the prior art, and the outlet of the cold air after heat exchange with the evaporator 202 can also be selected according to needs.

[0048] The overall form of the range hood is not limited to Fig.13 and Fig.14 As shown, any other form in the prior art may also be adopted.

[0049] The "fluid connection" referred to in the present invention refers to the spatial position relationship between two parts or parts (hereinafter collectively referred to as the first part and the second part respectively), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A fan system, comprising a centrifugal fan (1), the centrifugal fan (1) comprising a volute (11) and an impeller (12) arranged in the volute (11), the volute (11) being formed with an air inlet (111); characterized in that: The fan system also includes a condenser (2), the condenser (2) including an air inlet ring (21) and an air inlet grille (22), the air inlet ring (21) being arranged around the air inlet (111), the air inlet grille (22) extending from the inner periphery of the air inlet ring (21) along the axial direction of the centrifugal fan (1) into the volute (11) and extending into the interior of the impeller (12), the air inlet grille (22) being in the shape of a hollow cylinder as a whole, the air inlet grille (22) including grille bars (221) extending along the axial direction of the centrifugal fan (1), the grille bars (221) having at least two and arranged at intervals along the circumference of the centrifugal fan (1), the space between two adjacent grille bars (221) constituting a grille hole (223) for air flow to pass through, each grille bar (221) being in a hollow structure, the hollow space in each grille bar (221) directly constituting a refrigerant channel (222) for refrigerant to pass through.

2. The fan system according to claim 1, characterized in that: A refrigerant input channel (211) and a refrigerant output channel (212) are formed on the air inlet ring (21), and the refrigerant input channel (211) and the refrigerant output channel (212) are both fluidically connected to 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 comprises a connecting portion (224), wherein the connecting portion (224) connects the ends of the grille bars (221) of the air inlet grille (22) away from the air inlet ring (21), wherein a first annular confluence channel (225) is formed in the connecting portion (224), and a second annular confluence channel (213) is formed in the air inlet ring (21), wherein the first confluence channel (225) is fluidically connected to the refrigerant input channel (211) through one of the grille bars (221), and the second confluence channel (213) is fluidically connected to the refrigerant output channel (212) through another grille bar (221); Each grille bar (221) is connected to the connecting portion (224) so ​​that the corresponding refrigerant channel (222) is in fluid communication with the first confluence channel (225); in each grille bar (221), except for the grille bar (221) that is directly in fluid communication with the refrigerant input channel (211), the portion is connected to the air inlet ring (21) so that the corresponding refrigerant channel (222) is in fluid communication with the second confluence channel (213).

4. The fan system according to claim 3, characterized in that: The grille bars (221) have at least three, one end of each grille bar (221) facing the connection portion (224) is a first end, and one end of each grille bar (221) facing the air inlet ring (21) is a second end, the grille bar (221) directly in fluid communication with the refrigerant input channel (211) is marked as a first grille bar (2211), and the grille bar (221) directly in fluid communication with the refrigerant output channel (212) is marked as a second grille bar (2212), the first grille bar (2211) and the second grille bar (2212) are arranged adjacent to each other, the grille bar (221) arranged adjacent to the first grille bar (2211) is marked as a third grille bar (2213), and 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 a position corresponding to the first grid bar (2211) and the second grid bar (2212), so that one end of the first confluence channel (225) in the circumferential direction is connected to the first end of the first grid bar (2211) and is in fluid communication, the other end of the first confluence channel (225) in the circumferential direction is connected to the first end of the second grid bar (2212) and is in fluid communication, and the first ends of the remaining grid bars (221) are all connected to the first confluence channel (225) and are in fluid communication; The second confluence channel (213) forms a notch at a position corresponding to the second grid bar (2212) and the third grid bar (2213), so that 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, and 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, and the second ends of the remaining grid bars (221) are all connected to the second confluence channel (213) and are in fluid communication.

5. The fan system according to claim 3 or 4, characterized in that: The air inlet ring (21) and the connecting portion (224) are both made of heat-conducting materials; the refrigerant input channel (211), the refrigerant output channel (212) and the second confluence channel (213) are all directly formed in the hollow space within the air inlet ring (21); and the first confluence channel (225) is directly formed in the hollow space within the connecting portion (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 pipe portion (2215), the refrigerant channel (222) is formed in the pipe portion (2215), each grille bar (221) has two flanges (2214) and are respectively formed on both sides of the circumference of the pipe portion (2215), the flanges (2214) extend from the wall surface of the pipe portion (2215) toward the impeller (12), and 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 refrigeration range hood, comprising a compressor (201) and an evaporator (202), characterized in that: The refrigeration range hood further comprises a fan system as claimed in any one of claims 1 to 6, wherein the condenser (2) of the fan system cooperates with the above-mentioned compressor (201) and evaporator (202).

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