Centrifugal fan and refrigeration type range hood provided with same

Abstract

The centrifugal fan comprises a volute and an impeller, vent holes are formed in the front wall and / or the rear wall of the volute, an outer cover is arranged on the outer side of the front wall and / or the rear wall and covers the vent holes, an air inlet cavity is formed between the outer cover and the corresponding front wall and / or the rear wall, and the impeller is arranged in the air inlet cavity. The air inlet of the air inlet cavity is communicated with the interior of the volute through the ventilation hole. When the refrigeration type range hood works in a refrigeration mode, hot air blown out by the heat dissipation fan enters the volute through the air inlet cavity, and because the hot air blown out by the heat dissipation fan does not contain oil smoke, the hot air can pass through most of the front wall and / or the rear wall of the oil smoke suction fan, oil smoke airflow can be blocked by the hot air and is not prone to making contact with the front wall and / or the rear wall of the volute, and therefore the oil smoke is prevented from entering the volute. Therefore, the front wall and / or the rear wall of the volute cannot be polluted by lampblack, and the problem that lampblack attached to the inner surface of the volute is difficult to clean is solved. In the mode that the range hood is turned on singly and refrigeration is not turned on, the effect can be achieved by controlling the cooling fan to be turned on independently.

Description

Technical Field

[0001] The utility model relates to a range hood, in particular to a centrifugal fan and a refrigeration-type range hood equipped with the centrifugal fan. Background Art

[0002] Centrifugal fans have been widely used in range hoods for their advantages such as strong suction, low noise and compact structure. The volute is one of the core components of the centrifugal fan. Its function is to collect the gas leaving the impeller, guide it to the outlet of the volute, and convert the dynamic pressure into static pressure. The fan of the range hood generally adopts a centrifugal fan. After long-term use of the existing range hood, the inner wall of the volute of the fan will be stained with oil stains, which is difficult to clean. At present, when cleaning the fan, usually only the outer surface of the volute can be cleaned, and the impeller is disassembled and cleaned. Not only is it inconvenient to clean, but the inner wall of the volute is not easy to clean. In addition, in the existing refrigeration range hood, the condenser is often cooled by a heat dissipation fan, and the prior art also discloses a solution to take away the hot air blown out by the heat dissipation fan through the range hood fan, but the hot air blown out by the heat dissipation fan is not effectively utilized, resulting in heat waste. In summary, the existing refrigeration range hood structure needs to be further improved. Utility Model Content

[0003] The first technical problem to be solved by the utility model is to provide a centrifugal fan which can clean the inner surface of the volute by using external airflow in view of the above-mentioned existing technical status.

[0004] The second technical problem to be solved by the present invention is to provide a refrigeration-type range hood that can utilize the hot air blown out by the heat dissipation fan to prevent the inner wall of the volute from being contaminated by oil smoke in response to the above-mentioned existing technical status.

[0005] The technical solution adopted by the utility model to solve the above-mentioned first technical problem is: a centrifugal fan, including a volute and an impeller installed inside the volute, the volute including a front wall, a rear wall and a volute ring wall arranged between the front wall and the rear wall, characterized in that: ventilation holes are opened on the front wall and / or the rear wall, and an outer cover is provided on the outer side of the front wall and / or the rear wall with the ventilation holes, the outer cover covers the ventilation holes, and an air inlet cavity is formed between the outer cover and the corresponding front wall and / or the rear wall, the air inlet cavity has an air inlet, and the air inlet is connected with the interior of the volute through the ventilation holes.

[0006] In order to achieve a better ventilation effect, the ventilation holes are distributed in a mesh shape.

[0007] Further preferably, the opening area with ventilation holes on the front wall and / or the rear wall surrounds the outer circumference of the impeller. In this way, the opening area is larger and the ventilation effect is better.

[0008] Further preferably, the uppermost ventilation hole on the left side and the uppermost ventilation hole on the right side of the opening area are both arranged above the horizontal plane where the central axis of the impeller is located.

[0009] In order to set the thickness of the air inlet cavity within a reasonable range, the diameter D of the impeller and the thickness C of the air inlet cavity satisfy 0<C≤D / 4.

[0010] Further preferably, the outer side surface of the outer cover is parallel to the corresponding front wall or rear wall.

[0011] The air inlet of the air inlet cavity can be arranged at different positions. Preferably, a volute tongue is installed at the starting end of the volute profile, and the air inlet is close to the starting end of the volute profile.

[0012] In order to avoid air leakage in the air inlet cavity, the rear wall and the outer cover are integrated, and the front wall and the outer cover are integrated. Moreover, after adopting the integrated structure, the structure is more concise.

[0013] The technical solution adopted by the utility model to solve the above-mentioned second technical problem is: a refrigeration type range hood, including a range hood module, a compressor, a heat dissipation module and an indoor module, the range hood module includes a range hood fan, the heat dissipation module and the indoor module are arranged on the outside of the range hood fan, the heat dissipation module includes a condenser and a heat dissipation fan, the indoor module includes an evaporator and an indoor fan, the compressor, condenser and evaporator are connected by a refrigerant pipeline, and is characterized in that: the range hood fan adopts the centrifugal fan, and the air outlet of the heat dissipation fan is connected to the air inlet of the air inlet chamber.

[0014] In order to allow the hot air blown out from the heat dissipation fan outlet to smoothly enter the air inlet chamber, the heat dissipation fan is a centrifugal fan, and the central axis of the impeller of the range fumes exhaust fan is parallel to the central axis of the impeller of the heat dissipation fan. The heat dissipation fan is arranged above the range fumes exhaust fan, and the air outlet of the heat dissipation fan faces downward and toward the air inlet of the air inlet chamber.

[0015] Compared with the prior art, the utility model has the advantages that: the centrifugal fan forms an air inlet cavity on the front side of the front wall of the volute and / or on the rear side of the rear wall. After the external airflow enters the air inlet cavity, it can communicate with the interior of the volute through the ventilation holes on the front wall or the rear wall. When the refrigeration-type range hood operates in the refrigeration mode, the hot air blown out by the heat dissipation fan enters the interior of the volute through the air inlet cavity, and is then carried to the outdoors by the wind of the range hood fan. In this process, since the hot air blown out by the heat dissipation fan does not contain oil smoke, the hot air will pass through most of the front wall and / or the rear wall of the range hood fan, and the oil smoke airflow will be blocked by the hot air blown out by the heat dissipation fan, and it is not easy to contact the front wall and / or the rear wall of the volute, so that the front wall and / or the rear wall of the volute will not be contaminated by oil smoke, solving the problem that the oil smoke attached to the inner surface of the volute is difficult to clean. In the mode of turning on the range hood alone and not turning on the refrigeration, the above effect can also be achieved by controlling the heat dissipation fan to turn on separately. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a centrifugal fan according to an embodiment of the utility model (without the impeller);

[0017] Figure 2 for Figure 1 The schematic diagram of the structure of the centrifugal fan after removing the outer cover is shown;

[0018] Figure 3 for Figure 1 A structural cross-sectional view of a centrifugal fan shown;

[0019] Figure 4 This is a schematic structural diagram of a refrigeration-type range hood according to an embodiment of the utility model;

[0020] Figure 5 for Figure 4 Another structural schematic diagram of the refrigeration type range hood shown;

[0021] Figure 6 This is a schematic diagram of the connection of the air conditioning components of the refrigeration type range hood according to an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] like Figure 1 As shown in FIG. 4 , the centrifugal fan of this embodiment is a range hood fan 1, which includes a volute 11 and an impeller 12 installed inside the volute 11, the volute 11 includes a front wall 111, a rear wall 112 and a volute ring wall 113 arranged between the front wall 111 and the rear wall 112, and a volute tongue 15 is installed at the starting end of the volute 11 profile. The above structure is a conventional structure of an existing centrifugal fan.

[0024] In this embodiment, ventilation holes 114 are arranged in a mesh on the front wall 111 of the volute 11, and the opening area surrounds the outer periphery of 12, and the uppermost ventilation hole 114 on the left side of the opening area and the uppermost ventilation hole 114 on the right side are both arranged above the horizontal plane where the central axis of the impeller is located. It can be seen that the opening area is large, which is conducive to improving the air intake effect. An outer cover 13 is arranged on the outer side of the front wall 11, and the outer side surface of the outer cover 13 is parallel to the front wall 111. The outer cover 13 and the front wall 111 can be an integral part or a split part.

[0025] The outer cover 13 covers the ventilation holes 114, and an air inlet cavity is formed between the outer cover 13 and the corresponding front wall 111. The air inlet cavity has an air inlet 14, and the air inlet 14 is connected to the inside of the volute 11 through the ventilation holes 114. The air inlet 14 can be set at multiple different positions, and there can be multiple air inlets 14. In this embodiment, there is one air inlet 14 and it is close to the starting end of the volute 11 profile, that is, close to the volute tongue 15. In addition, the diameter D of the impeller 12 and the thickness C of the air inlet cavity satisfy 0<C≤D / 4, preferably C≤D / 8.

[0026] like Figures 4 to 6 As shown, the range hood of this embodiment includes a range hood module, a compressor 2, a heat dissipation module 3 and a refrigeration module 4, wherein the range hood module includes a range hood fan 1, the heat dissipation module 3 and the refrigeration module 4 are arranged outside the range hood fan 1, the heat dissipation module 3 includes a condenser 31 and a heat dissipation fan 32, the refrigeration module 4 includes an evaporator 41 and an indoor fan 42, the compressor 2, the condenser 31 and the evaporator 41 are connected through a refrigerant pipeline 5, and the above structure is the same as that of the existing refrigeration range hood and will not be described in detail here.

[0027] The range hood fan 1 adopts the centrifugal fan in this embodiment, and the heat dissipation fan 32 is also a centrifugal fan, and the impeller center axis of the range hood fan 1 is parallel to the impeller center axis of the heat dissipation fan 32. The heat dissipation fan 32 is arranged above the range hood fan 1, and the air outlet of the heat dissipation fan 32 faces downward and toward the air inlet 14 of the air inlet chamber, and the air outlet of the heat dissipation fan 32 is connected to the air inlet 14.

[0028] When the refrigeration-type range hood is working in the cooling mode, the hot air blown by the heat dissipation fan 32 enters the interior of the volute 11 through the air inlet chamber, and is then carried to the outside by the wind of the range hood fan 1. In this process, since the hot air blown by the heat dissipation fan 32 does not contain oil smoke, the hot air will pass through most of the front wall 111 of the range hood fan 1, and the oil smoke airflow will be blocked by the hot air blown by the heat dissipation fan, and it is not easy to contact the front wall 111 of the volute, so that the front wall 111 will not be contaminated by oil smoke, solving the problem that oil smoke attached to the inner surface of the volute is difficult to clean. In the single-open range hood and non-refrigeration mode, by controlling to turn on the heat dissipation fan 32 alone, although the heat dissipation fan 32 does not blow hot air, the airflow blown into the interior of the volute 11 through the ventilation hole 114 also plays a role in blocking oil smoke, and the above-mentioned effect can also be achieved.

[0029] In addition, in addition to setting ventilation holes 114 on the front wall 111 of the volute, ventilation holes 114 can also be set on the rear wall 112, or ventilation holes 114 can be set on both the front wall 111 and the rear wall 112, and the ventilation holes 114 can adopt a variety of different shapes as long as the ventilation function is met.

[0030] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations 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.

Claims

1. A centrifugal fan, comprising a volute (11) and an impeller (12) mounted inside the volute (11), wherein the volute (11) comprises a front wall (111), a rear wall (112) and a volute annular wall (113) disposed between the front wall (111) and the rear wall (112), characterized in that: A ventilation hole (114) is provided on the front wall (111) and / or the rear wall (112); an outer cover (13) is provided on the outer side of the front wall (111) and / or the rear wall (112) having the ventilation hole (114); the outer cover (13) covers the ventilation hole (114); an air inlet cavity is formed between the outer cover (13) and the corresponding front wall (111) and / or the rear wall (112); the air inlet cavity has an air inlet port (14); and the air inlet port (14) is connected to the interior of the volute (11) through the ventilation hole (114).

2. The centrifugal fan according to claim 1, characterized in that: The ventilation holes (114) are distributed in a mesh shape.

3. The centrifugal fan according to claim 2, characterized in that: The opening area on the front wall (111) and / or the rear wall (112) having ventilation holes (114) surrounds the outer circumference of the impeller (12).

4. The centrifugal fan according to claim 3, characterized in that: The uppermost ventilation hole (114) on the left side and the uppermost ventilation hole (114) on the right side of the opening area are both arranged above the horizontal plane where the central axis of the impeller is located.

5. The centrifugal fan according to claim 1, characterized in that: The diameter D of the impeller (12) and the thickness C of the air inlet cavity satisfy 0<C≤D / 4.

6. The centrifugal fan according to claim 1, characterized in that: The outer side surface of the outer cover (13) is parallel to the corresponding front wall (111) or rear wall (112).

7. The centrifugal fan according to claim 1, characterized in that: A volute tongue (15) is installed at the starting end of the volute (11) profile, and the air inlet (14) is close to the starting end of the volute (11) profile.

8. The centrifugal fan according to claim 1, characterized in that: The rear wall (112) and the outer cover (13) are an integral part, and the front wall (111) and the outer cover (13) are an integral part.

9. A refrigeration type range hood, comprising a range hood module, a compressor (2), a heat dissipation module (3) and a refrigeration module (4), wherein the range hood module comprises a range hood fan (1), the heat dissipation module (3) and the refrigeration module (4) are arranged outside the range hood fan (1), the heat dissipation module (3) comprises a condenser (31) and a heat dissipation fan (32), the refrigeration module (4) comprises an evaporator (41) and an indoor fan (42), the compressor (2), the condenser (31) and the evaporator (41) are connected via a refrigerant pipeline (5), and is characterized in that: The range fumes exhaust fan (1) is a centrifugal fan as claimed in any one of claims 1 to 8, and the air outlet of the heat dissipation fan (32) is connected to the air inlet (14) of the air inlet cavity.

10. The refrigeration type range hood according to claim 9, characterized in that: The heat dissipation fan (32) is a centrifugal fan, and the central axis of the impeller of the range fumes suction fan (1) is parallel to the central axis of the impeller of the heat dissipation fan (32). The heat dissipation fan (32) is arranged above the range fumes suction fan (1), and the air outlet of the heat dissipation fan (32) faces downward and toward the air inlet (14) of the air inlet chamber.

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