Centrifugal fan and refrigeration type range hood provided with same

Abstract

The centrifugal fan comprises a volute and an impeller, the volute is provided with an outer ring wall and an inner ring wall, an air interlayer is formed between the outer ring wall and the inner ring wall, the closed end of the outer ring wall is connected with the inner ring wall in a closed mode, and an air interlayer air inlet is formed between the open end of the outer ring wall and the inner ring wall. A ventilation opening is formed in the inner ring wall and forms an air interlayer air outlet, the air interlayer is communicated with an air channel in the volute through the ventilation opening, and a cooling fan air outlet is communicated with an air interlayer air inlet. According to the refrigeration type range hood, the air outlet of the heat dissipation fan is communicated with the air inlet of the air interlayer, air of the heat dissipation fan does not contain oil fume, and the air of the heat dissipation fan passes through most of the inner ring wall of the oil fume suction fan, so that the air of the oil fume suction fan does not pass through the inner side of the inner ring wall and the inner side of the outer ring wall of the oil fume suction fan; the inner sides of the inner ring wall and the outer ring wall cannot be polluted by oil smoke, so that the problem that the oil smoke attached to the inner surface of the volute is difficult to clean is solved.

Description

Technical Field

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

[0002] Centrifugal fans are 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. In order to improve the efficiency, it is usually necessary to match it with a high-efficiency DC motor, which is relatively expensive. In addition, the existing centrifugal fan has only one air inlet, which has certain limitations. In order to improve the oil fume extraction effect and improve the performance of the range hood, the air inlet can be increased. For example, the "Fan volute intermediate plate guide vane air inlet structure of range hood" disclosed in the Chinese utility model patent with patent number CN201220666311.8 (authorization announcement number CN 203051230 U) includes an annular intermediate plate connected to the front cover plate and the rear cover plate of the volute. The angle of the volute tongue at the front end of the annular intermediate plate is designed to prevent the air volume from not entering the outlet and flowing back to the volute at an optimal angle. An air inlet is provided at the rear end of the volute tongue, and an air inlet is provided at the rear end of the annular intermediate plate volute tongue. After the impeller blades pass through the volute tongue, the air flow is immediately introduced from the air inlet through the air inlet guide plate, thereby improving the fan efficiency and increasing the air volume at the outlet. Although this structure has a certain effect on improving the absorption of oil smoke, backflow may occur, and the improvement of the fan efficiency is relatively limited.

[0003] After long-term use, the inner wall of the volute of the fan of the existing range hood will be covered 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 must be removed for cleaning. Not only is cleaning inconvenient, 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. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a centrifugal fan in which airflow can flow along the inner wall of the volute in view of the above-mentioned existing technical status.

[0005] 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.

[0006] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: the centrifugal fan includes a volute and an impeller arranged inside the volute, and is characterized in that: the volute has an outer annular wall and an inner annular wall, an air layer is formed between the outer annular wall and the inner annular wall, the closed end of the outer annular wall is closed and connected with the inner annular wall, an air layer inlet is formed between the open end of the outer annular wall and the inner annular wall, a ventilation hole is opened in the inner annular wall, the ventilation hole forms an air layer outlet, and the air layer is connected with the air duct inside the volute through the ventilation hole.

[0007] Preferably, the ventilation openings are distributed at intervals along the circumference of the inner annular wall.

[0008] In order to guide the airflow in the air interlayer to the air duct inside the volute, an air guide piece for guiding the airflow in the air interlayer to the air duct inside the volute is installed at the vent.

[0009] The length of the air guide blade can be selected in many ways. Preferably, the air guide blade is arranged to extend from the root to the inside of the volute. The length of the air guide blade is a, and the arc length corresponding to the vent is L. Then 0 <a<5L。

[0010] Further preferably, a volute tongue is installed at the outlet of the volute, and the air guide vane is arranged extending from the root to the inside of the volute, the length of the air guide vane is a, and on a plane perpendicular to the central axis of the impeller and passing through the center of the impeller, the straight line passing through the tip of the volute tongue and the center of the impeller is M, and the straight line passing through the starting position of the vent and the center of the impeller is N, and the angle α between the straight line M and the straight line N satisfies 1°≤α≤350°, and the length a of the air guide vane increases or remains unchanged as the angle α increases. In this way, it can be ensured that the air guide vanes at different positions can play an effective wind guiding role.

[0011] Further preferably, the angle between the air guide plate and the tangent line of the volute at the starting position of the ventilation opening of the inner ring wall is γ, and the angle γ increases or remains unchanged as the angle α increases.

[0012] Further preferably, the angle between the air guide vane and the tangent line of the volute at the starting position of the ventilation opening of the inner ring wall is γ, and the outlet angle of the impeller is β, then β+γ≥180, and 0<γ≤60°. It is known from experiments that when the angle γ and the outlet angle β meet the above conditions, the air guide vane has a better airflow guiding effect.

[0013] Further preferably, the angle γ decreases as the outlet angle β increases, and increases as the outlet angle β decreases.

[0014] The vents and air guides may have a variety of different shapes. Preferably, the vents are in the shape of a square, a circle, an ellipse, a triangle, or a parallelogram, and correspondingly, the air guides are in the shape of a square, a circle, an ellipse, a triangle, or a parallelogram.

[0015] The vent can have different opening sizes. Preferably, on a plane perpendicular to the central axis of the impeller (12) and passing through the center of the impeller, the straight line between the starting position of the vent and the center of the impeller is N, and the straight line between the ending position of the vent and the center of the impeller is P. The angle between the straight line N and the straight line P is θ, and 5°<θ≤60°.

[0016] The thickness of the air layer and the diameter of the impeller must meet certain requirements. Preferably, the diameter of the impeller is D, the thickness of the air layer is C, and 0<C≤D / 4 is satisfied.

[0017] Further preferably, the outer annular wall and the inner annular wall of the volute are an integral part or separate parts.

[0018] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: the refrigeration type range hood includes 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, the range hood fan adopts the centrifugal fan, and is characterized in that: the air outlet of the heat dissipation fan is connected to the air inlet of the air interlayer.

[0019] In order to allow the hot air blown out from the heat dissipation fan outlet to smoothly enter the air layer of the centrifugal fan, the heat dissipation fan is a centrifugal fan, and the impeller center axis of the range hood exhaust fan is parallel to the impeller center axis of the heat dissipation fan.

[0020] In order to achieve a better air intake effect, the heat dissipation fan is arranged above the range fumes suction fan, and the air outlet of the heat dissipation fan faces downward and toward the air inlet of the air interlayer.

[0021] Compared with the prior art, the advantages of the present invention are: the volute of the centrifugal fan has an outer ring wall and an inner ring wall, an air layer is formed between the outer ring wall and the inner ring wall, the closed end of the outer ring wall is closed and connected with the inner ring wall, an air layer inlet is formed between the open end of the outer ring wall and the inner ring wall, the air layer is connected with the internal air duct of the volute through the ventilation hole on the inner ring wall, and the air outlet of the heat dissipation fan of the refrigeration type range hood is connected with the air outlet of the air layer. Since the wind of the heat dissipation fan does not contain oil smoke, the outlet air of the heat dissipation fan will pass through most of the inner ring wall of the range hood fan, so that the wind of the range hood fan will not pass through the inner ring wall and the inner side of the outer ring wall of the range hood fan. As a result, the inner ring wall and the inner side of the outer ring wall of the range hood fan will not be contaminated by oil smoke, thereby solving the problem that the oil smoke attached to the inner surface of the volute is difficult to clean. In addition, the hot air blown into the air layer can also clean the oil stains in the layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a centrifugal fan according to an embodiment of the present invention;

[0023] Figure 2 Another structural schematic diagram of a centrifugal fan according to an embodiment of the present invention;

[0024] Figure 3 A schematic structural diagram of a refrigeration-type range hood according to an embodiment of the present invention;

[0025] Figure 4 for Figure 3 The structural schematic diagram of the refrigeration type range hood shown;

[0026] Figure 5 It is a schematic diagram of the connection of the air conditioning components of the refrigeration type range hood according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings.

[0028] like Figure 1 and Figure 2 As shown, the centrifugal fan 1 of this embodiment includes a volute 11 and an impeller 12 arranged inside the volute 11, and a volute tongue 13 is installed at the outlet of the volute 11. The volute 11 has an outer annular wall 111 and an inner annular wall 112, and the outer annular wall 111 and the inner annular wall 112 can be an integral part or a separate part. An air interlayer 113 is formed between the outer annular wall 111 and the inner annular wall 112. If the diameter of the impeller 12 is D and the thickness of the air interlayer 113 is C, then 0<C≤D / 4 is satisfied.

[0029] The closed end of the outer annular wall 111 is sealed and connected to the inner annular wall 112, and an air layer air inlet 114 is formed between the open end of the outer annular wall 111 and the inner annular wall 112. Ventilation holes 115 are opened on the inner annular wall 112, and the vents 115 are distributed at intervals along the circumference of the inner annular wall 112. The vents 115 form air layer air outlets, and the air layer 113 is connected to the internal air duct of the volute 11 through the vents 115.

[0030] On a plane perpendicular to the central axis of the impeller 12 and passing through the center of the impeller 12, the straight line between the starting position of the vent 115 and the center of the impeller 12 is N, and the straight line between the ending position of the vent 115 and the center of the impeller 12 is P, then the angle between the straight line N and the straight line P is θ, then 5°<θ≤60°. The angle θ is the opening size of the vent 115.

[0031] A wind guiding vane 116 is installed at the ventilation opening 115 to guide the air flow in the air interlayer 113 into the internal air duct of the volute 11. The wind guiding vane 116 extends from the root towards the inside of the volute 11. The shape of the ventilation opening 115 can be square, circular, oval, triangular, parallelogram, etc. Correspondingly, the shape of the wind guiding vane 116 is square, circular, oval, triangular, parallelogram, etc. In addition, it is not necessary to install the wind guiding vane 116 at each ventilation opening 115. It is possible to choose not to install the wind guiding vane at some ventilation openings, or to install more than one wind guiding vane at one ventilation opening. In this embodiment, a wind guiding vane 116 is installed at each ventilation opening 115.

[0032] The length of the wind guiding vane 116 is a, and the arc length corresponding to the ventilation opening 115 is L, then 0 < a < 5L. On the plane perpendicular to the central axis of the impeller 12 and passing through the center of the impeller 12, taking the straight line between the tip of the volute tongue 13 and the center of the impeller 12 as M, and the straight line between the starting position of the ventilation opening 115 and the center of the impeller 12 as N, the included angle α between the straight line M and the straight line N satisfies 1° ≤ α ≤ 350°. And the length a of the wind guiding vane 116 increases or remains unchanged as the included angle α increases. The length of the starting wind guiding vane 116 is a1, and the lengths of the subsequent wind guiding vanes 116 are a2......an in sequence, an ≥ an-1 ≥...... ≥ a1. Thus, it can be ensured that the wind guiding vanes 116 at different positions can all play an effective role in guiding the air flow.

[0033] The angle between the wind guiding vane 116 and the tangent of the volute at the starting position of the ventilation opening 115 of the inner ring wall 112 is γ, and the outlet angle of the impeller is β, then β + γ ≥ 180 and 0 < γ ≤ 60°. And the angle γ decreases as the outlet angle β increases and increases as the outlet angle β decreases. In addition, the angle γ also increases or remains unchanged as the included angle α increases, that is, the angle of the starting wind guiding vane 116 is γ1, and the subsequent wind guiding vanes 116 are γ2......γn in sequence, then γn ≥ γn-1 ≥...... ≥ γ1.

[0034] As Figures 3 to 5 shown, the refrigerating range hood of this embodiment includes a fume extraction module, a compressor 2, a heat dissipation module 3 and an inner machine module 4. Among them, the fume extraction module includes a fume extraction fan. The heat dissipation module 3 and the inner machine module 4 are arranged outside the fume extraction fan. The heat dissipation module 3 includes a condenser 31 and a heat dissipation fan 32. The inner machine module 4 includes an evaporator 41 and an inner machine fan 43. The compressor 2, the condenser 31 and the evaporator 41 are connected through a refrigerant pipeline 5. The above structure is the same as that of the existing refrigerating range hood and will not be described in detail here.

[0035] The range hood fan of the range hood extraction module adopts the centrifugal fan 1 in this embodiment, and the heat dissipation fan 32 is also a centrifugal fan, and the central axis of the impeller 12 of the range hood extraction fan is parallel to the central axis of the impeller 12 of the heat dissipation fan 32. The heat dissipation fan 32 is arranged above the range hood extraction fan, and the air outlet of the heat dissipation fan 32 faces downward and toward the air interlayer air inlet 14. The air outlet of the heat dissipation fan 32 is connected with the air interlayer air inlet 14, and the air guide plate 116 is used to guide the air outlet of the heat dissipation fan 32. The vent 115 is connected with the internal air duct of the range hood extraction fan.

[0036] When the refrigeration type range hood is working in the cooling mode, since the wind from the heat dissipation fan 32 does not contain oil smoke, the hot air blown out by the heat dissipation fan 32 will pass through most of the inner annular wall 112 of the range hood, so that the wind from the range hood will not pass through the inner side of the inner annular wall 112 and the outer annular wall 111 of the range hood. Therefore, the inner side of the inner annular wall 112 and the outer annular wall 111 of the range hood will not be contaminated by oil smoke, thereby solving the problem that the oil smoke attached to the inner surface of the volute is difficult to clean. In addition, the hot air blown into the air interlayer 113 can also clean the oil stains in the interlayer.

[0037] When only the range hood is turned on and the cooling mode is not turned on, the cooling fan 32 can be turned on separately through control. Although the cooling fan 32 does not blow out hot air, it can also prevent the inner side of the fan inner ring wall 112 and the outer ring wall 111 from being contaminated by oil smoke.

[0038] 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) arranged inside the volute (11), characterized in that: The volute (11) comprises an outer annular wall (111) and an inner annular wall (112); an air layer (113) is formed between the outer annular wall (111) and the inner annular wall (112); the closed end of the outer annular wall (111) is sealed and connected to the inner annular wall (112); an air layer air inlet (114) is formed between the open end of the outer annular wall (111) and the inner annular wall (112); a vent (115) is provided on the inner annular wall (112); the vent (115) forms an air layer air outlet; and the air layer (113) is connected to an internal air duct of the volute (11) through the vent (115).

2. The centrifugal fan according to claim 1, characterized in that: The ventilation openings (115) are distributed at intervals along the circumference of the inner annular wall (112).

3. The centrifugal fan according to claim 1, characterized in that: The ventilation opening (115) is provided with an air guide piece (116) for guiding the air flow in the air layer (113) into the air duct inside the volute (11).

4. The centrifugal fan according to claim 3, characterized in that: The air guide piece (116) is arranged to extend from the root to the inside of the volute (11), the length of the air guide piece (116) is a, and the arc length corresponding to the vent (115) is L, then <a<5L。 5. The centrifugal fan according to claim 3, characterized in that: A volute tongue (13) is installed at the outlet of the volute (11), and the air guide plate (116) is arranged to extend from the root to the inside of the volute (11), and the length of the air guide plate (116) is a. On a plane perpendicular to the central axis of the impeller (12) and passing through the center of the impeller (12), a straight line passing through the tip of the volute tongue (13) and the center of the impeller (12) is M, and a straight line passing through the starting position of the ventilation port (115) and the center of the impeller (12) is N. An angle α between the straight line M and the straight line N satisfies 1°≤α≤350°, and the length a of the air guide plate increases or remains unchanged as the angle α increases.

6. The centrifugal fan according to claim 5, characterized in that: The angle between the air guide piece (116) and the tangent line of the volute at the starting position of the ventilation opening (115) of the inner ring wall (112) is γ, and the angle γ increases or remains unchanged as the included angle α increases.

7. The centrifugal fan according to claim 3, characterized in that: The angle between the air guide blade (116) and the tangent line of the volute at the starting position of the ventilation opening (115) of the inner ring wall (112) is γ, and the outlet angle of the impeller is β, then β+γ≥180, and 0<γ≤60°.

8. The centrifugal fan according to claim 7, characterized in that: The angle γ decreases as the outlet angle β increases, and increases as the outlet angle β decreases.

9. The centrifugal fan according to claim 3, characterized in that: The shape of the ventilation opening (115) is square, circular, elliptical, triangular or parallelogram, and correspondingly, the shape of the air guide piece (116) is square, circular, elliptical, triangular or parallelogram.

10. The centrifugal fan according to claim 1, characterized in that: On a plane perpendicular to the central axis of the impeller (12) and passing through the center of the impeller (12), a straight line passing between the starting position of the vent (115) and the center of the impeller (12) is N, and a straight line passing between the ending position of the vent (115) and the center of the impeller (12) is P, then an angle between the straight line N and the straight line P is θ, and 5°<θ≤60°.

11. The centrifugal fan according to claim 1, characterized in that: The diameter of the impeller (12) is D, and the thickness of the air layer (113) is C, then 0<C≤D / 4 is satisfied.

12. The centrifugal fan according to claim 1, characterized in that: The outer annular wall (111) and the inner annular wall (112) of the volute (11) are an integral part or separate parts.

13. A refrigeration type range hood, comprising a range hood module, a compressor (2), a heat dissipation module (3) and an indoor module (4), wherein the range hood module comprises a range hood fan, the heat dissipation module (3) and the indoor module (4) are arranged outside the range hood fan, the heat dissipation module (3) comprises a condenser (31) and a heat dissipation fan (32), the indoor module (4) comprises an evaporator (41) and an indoor fan (43), the compressor (2), the condenser (31) and the evaporator (41) are connected via a refrigerant pipeline (5), the range hood fan adopts the centrifugal fan (1) according to any one of claims 1 to 12, and is characterized in that: The air outlet of the heat dissipation fan (32) is in communication with the air inlet (14) of the air interlayer.

14. The refrigeration type range hood according to claim 13, characterized in that: The heat dissipation fan (32) is a centrifugal fan, and the central axis of the impeller (12) of the range fumes suction fan and the central axis of the impeller (12) of the heat dissipation fan (32) are parallel to each other.

15. The refrigeration type range hood according to claim 13, characterized in that: The heat dissipation fan (32) is arranged above the range fumes suction fan, and the air outlet of the heat dissipation fan (32) faces downward and toward the air interlayer air inlet (14).

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