A centrifugal fan and a refrigeration type range hood provided with the same

Abstract

A centrifugal fan and a refrigeration type range hood provided with the centrifugal fan, the centrifugal fan comprising a volute and an impeller, the volute having an outer ring wall and an inner ring wall, an air interlayer being formed between the outer ring wall and the inner ring wall, the outer ring wall being closedly connected with the inner ring wall, an air interlayer air inlet being formed between the outer ring wall open end and the inner ring wall, a ventilation opening being formed in the inner ring wall, the ventilation opening forming an air interlayer air outlet, the air interlayer being communicated with an internal air duct of the volute through the ventilation opening, and the heat dissipation fan air outlet being communicated with the air interlayer air inlet. The heat dissipation fan air outlet of the refrigeration type range hood is communicated with the air interlayer air inlet, and the air of the heat dissipation fan does not contain oil fume, so that the air outlet of the heat dissipation fan passes through most of the inner ring wall of the oil fume suction fan, and the air of the oil fume suction fan does not pass through the inner side of the inner ring wall and the outer ring wall of the oil fume suction fan, so that the inner side of the inner ring wall and the outer ring wall is not polluted by oil fume, thereby solving the problem that oil fume adhered to the inner surface of the volute is difficult to clean.

Description

TECHNICAL FIELD

[0001] The present application relates to a range hood, in particular to a centrifugal fan and a refrigeration type range hood provided with the centrifugal fan. BACKGROUND

[0002] The centrifugal fan is widely used in the range hood due to its large suction, low noise and compact structure. The volute is one of the core components of the centrifugal fan, which concentrates the gas leaving the impeller and guides it to the outlet of the volute, and converts the dynamic pressure into static pressure. The fan of the range hood generally adopts a centrifugal fan, and in order to improve the efficiency, a high-efficiency DC motor is usually required, which has a high cost. In addition, the existing centrifugal fan has only one air inlet, which has certain limitations. In order to improve the smoke suction effect and performance of the range hood, the air inlet can be increased. For example, the patent No. CN201220666311.8 (authorized publication No. CN203051230U) discloses a fan volute middle plate guide vane air inlet structure of a range hood, which comprises a ring-shaped middle plate connected with a front cover plate and a rear cover plate of the volute. The volute tongue angle at the front end of the ring-shaped middle plate is designed to prevent the wind from entering the outlet and reflowing to the volute. The rear end of the volute tongue is provided with an air inlet. The rear end of the volute tongue of the ring-shaped middle plate is provided with an air inlet. 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, so that the efficiency of the fan is improved, the wind volume at the outlet is increased, and although the structure has certain effect on improving the smoke suction, the backflow phenomenon may occur, and the efficiency of the fan is improved to a limited extent.

[0003] The inner wall of the volute of the fan of the existing range hood is full of oil stains after long-term use, which is difficult to clean. At present, when cleaning the fan, only the outer surface of the volute can be cleaned, and the impeller needs to be disassembled and cleaned, which is not only inconvenient to clean, but also the inner wall of the volute is difficult to clean. In addition, in the existing refrigeration type range hood, the condenser is usually cooled by a cooling fan, and in the prior art, a scheme of taking away the hot air blown by the cooling fan by the range hood is also disclosed, but the hot air blown by the cooling fan is not effectively utilized, causing waste of heat. In view of the above, the structure of the existing refrigeration type range hood needs to be further improved. SUMMARY

[0004] The first technical problem to be solved by the present application is to provide a centrifugal fan with air flow flowing along the inner wall of the volute in view of the above-mentioned prior art.

[0005] The second technical problem to be solved by the present application is to provide a refrigeration type range hood capable of avoiding pollution of the inner wall of the volute by using the hot air blown by the cooling fan in view of the above-mentioned prior art.

[0006] The centrifugal fan comprises a volute and an impeller arranged in the volute, and is characterized in that: the volute has 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 in closed connection with the inner ring wall, 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 arranged on the inner ring wall, the ventilation opening forms an air interlayer air outlet, and the air interlayer is in communication with an internal air duct of the volute through the ventilation opening.

[0007] Preferably, the ventilation openings are spaced apart along the circumference of the inner ring wall.

[0008] In order to guide the airflow in the air interlayer into the internal air duct of the volute, a wind guide vane is arranged on the ventilation opening and used to guide the airflow in the air interlayer into the internal air duct of the volute.

[0009] The length of the wind guide vane can be selected in various ways, and preferably, the wind guide vane is arranged to extend from the root portion to the inside of the volute, the length of the wind guide vane is a, the corresponding arc length of the ventilation opening is L, and 0 < a < 5L.

[0010] Further preferably, a volute tongue is arranged at the outlet of the volute, the wind guide vane is arranged to extend from the root portion to the inside of the volute, the length of the wind guide vane is a, on a plane perpendicular to the central axis of the impeller and passing through the center of the impeller, a straight line passing through the tip of the volute tongue and the center of the impeller is M, a straight line passing through the starting position of the ventilation opening and the center of the impeller is 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 guide vane increases or remains unchanged as the included angle α increases. In this way, the wind guide vane at different positions can effectively guide the airflow.

[0011] Further preferably, the angle between the wind guide vane and the tangent of the volute at the starting position of the ventilation opening is γ, and the angle γ increases or remains unchanged as the included angle α increases.

[0012] Further preferably, the angle between the wind guide vane and the tangent of the volute at the starting position of the ventilation opening is γ, the outlet angle of the impeller is β, β + γ ≥ 180, and 0 < γ ≤ 60°. It has been found through experiments that when the angle γ and the outlet angle β satisfy the above conditions, the wind guide vane has a better air 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 ventilation opening and the wind guide vane can have various shapes, and preferably, the ventilation opening is square, circular, elliptical, triangular, or parallelogram-shaped, and correspondingly, the wind guide vane is square, circular, elliptical, triangular, or parallelogram-shaped.

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

[0016] The thickness of the air sandwich and the diameter of the impeller need to meet certain requirements, preferably, the diameter of the impeller is D, and the thickness of the air sandwich is C, then 0 < C ≤ D / 4 is met.

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

[0018] The technical scheme adopted by the present application to solve the above-mentioned second technical problem is: the refrigeration type range hood comprises an oil fume suction module, a compressor, a heat dissipation module and an indoor unit module, the oil fume suction module comprises an oil fume suction fan, the heat dissipation module and the indoor unit module are arranged outside the oil fume suction fan, the heat dissipation module comprises a condenser and a heat dissipation fan, the indoor unit module comprises an evaporator and an indoor unit fan, the compressor, the condenser and the evaporator are connected through a refrigerant pipeline, the oil fume suction fan adopts the centrifugal fan, and the heat dissipation fan is characterized in that: an air inlet of the air sandwich is connected with an air outlet of the heat dissipation fan.

[0019] In order to make the hot air blown out of the air outlet of the heat dissipation fan smoothly enter the air sandwich of the centrifugal fan, the heat dissipation fan is a centrifugal fan, and the center shaft of the impeller of the oil fume suction fan and the center shaft of the impeller of the heat dissipation fan are parallel to each other.

[0020] In order to make the air inlet effect better, the heat dissipation fan is arranged above the oil fume suction fan, the air outlet of the heat dissipation fan faces downward and towards the air inlet of the air sandwich.

[0021] Compared with the prior art, the advantages of the present application are that: the volute of the centrifugal fan has an outer ring wall and an inner ring wall, an air sandwich 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, an air sandwich air inlet is formed between the open end of the outer ring wall and the inner ring wall, the air sandwich is connected with the internal air duct of the volute through the vent on the inner ring wall, the air outlet of the heat dissipation fan of the refrigeration type range hood is connected with the air sandwich air inlet, since the air of the heat dissipation fan does not contain oil fume, the air outlet of the heat dissipation fan will pass through most of the inner ring wall of the oil fume suction fan, so that the air of the oil fume suction fan will not pass through the inner side of the inner ring wall and the outer ring wall of the oil fume suction fan, thereby, the inner side of the inner ring wall and the outer ring wall of the oil fume suction fan will not be polluted by oil fume, thereby solving the problem that it is difficult to clean the oil fume attached to the inner surface of the volute, in addition, the hot air blown into the air sandwich can also clean the oil stains in the air sandwich. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Structure diagram of centrifugal fan of the embodiment of the present application;

[0023] Figure 2 Another structure diagram of centrifugal fan of the embodiment of the present application;

[0024] Figure 3 Structure diagram of refrigerated range hood of the embodiment of the present application;

[0025] Figure 4 Structure diagram of refrigerated range hood of the embodiment of the present application; Figure 3 Structure diagram of refrigerated range hood of the embodiment of the present application;

[0026] Figure 5 Structure diagram of refrigerated range hood of the embodiment of the present application; DETAILED DESCRIPTION

[0027] The present application will be further described in detail with reference to the accompanying drawings.

[0028] As shown in Figure 1 and Figure 2 The centrifugal fan 1 of the embodiment comprises a volute 11 and an impeller 12 arranged inside the volute 11, and a volute tongue 13 is arranged at the outlet of the volute 11. The volute 11 has an outer ring wall 111 and an inner ring wall 112, which can be an integral piece or a split piece. An air gap 113 is formed between the outer ring wall 111 and the inner ring wall 112. If the diameter of the impeller 12 is D and the thickness of the air gap 113 is C, then 0 < C ≤ D / 4 is satisfied.

[0029] The closed end of the outer ring wall 111 is connected to the inner ring wall 112, and the air gap inlet 114 is formed between the open end of the outer ring wall 111 and the inner ring wall 112. Ventilation openings 115 are formed on the inner ring wall 112 and are spaced apart along the circumference of the inner ring wall 112. The ventilation openings 115 form air gap outlets, and the air gap 113 is connected to the air duct inside the volute 11 through the ventilation openings 115.

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

[0031] A wind guide vane 116 is installed at the ventilation opening 115 to guide the air flow in the air sandwich layer 113 into the internal air duct of the volute 11. The wind guide vane 116 extends from its 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 guide vane 116 is square, circular, oval, triangular, parallelogram, etc. Additionally, it is not necessary to install the wind guide vane 116 at each ventilation opening 115. Some ventilation openings can be selected not to install the wind guide vane, or more than one wind guide vane can be installed at one ventilation opening. In this embodiment, a wind guide vane 116 is installed at each ventilation opening 115.

[0032] The length of the wind guide 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 guide vane 116 increases or remains unchanged as the included angle α increases. The length of the starting wind guide vane 116 is a1, and the lengths of the subsequent wind guide vanes 116 are a2......an in sequence, an ≥ an-1 ≥...... ≥ a1. Thus, it can be ensured that the wind guide vanes 116 at different positions can all play an effective role in guiding the air flow.

[0033] The angle between the wind guide 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. Additionally, the angle γ also increases or remains unchanged as the included angle α increases, that is, the angle of the starting wind guide vane 116 is γ1, and the subsequent wind guide 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 an oil fume suction module, a compressor 2, a heat dissipation module 3, and an inner machine module 4. Among them, the oil fume suction module includes an oil fume suction fan. The heat dissipation module 3 and the inner machine module 4 are arranged outside the oil fume suction 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 oil fume suction fan of the oil fume suction module adopts the centrifugal fan 1 in the embodiment, the heat dissipation fan 32 is also a centrifugal fan, the center shaft of the impeller 12 of the oil fume suction fan is parallel to the center shaft of the impeller 12 of the heat dissipation fan 32, the heat dissipation fan 32 is arranged above the oil fume suction fan, the air outlet of the heat dissipation fan 32 faces downward and towards the air layer air inlet 14, the air outlet of the heat dissipation fan 32 is in communication with the air layer air inlet 14, the air deflector 116 is used to guide the air outlet of the heat dissipation fan 32, and the air vent 115 is in communication with the internal air duct of the oil fume suction fan.

[0036] When the refrigeration type oil fume suction machine works in the refrigeration mode, since the air of the heat dissipation fan 32 does not contain oil fume, the hot air blown by the heat dissipation fan 32 can pass through most of the inner ring wall 112 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 112 and the outer ring wall 111 of the oil fume suction fan, thereby the inner side of the inner ring wall 112 and the outer ring wall 111 of the oil fume suction fan cannot be polluted by oil fume, so that the problem that oil fume is difficult to clean on the inner surface of the volute is solved, in addition, the hot air blown into the air layer 113 can also clean the oil stains in the air layer.

[0037] When only the oil fume suction machine is turned on and the refrigeration mode is not turned on, the heat dissipation fan 32 can be controlled to be opened alone, although the air blown by the heat dissipation fan 32 is not hot air, but the inner side of the inner ring wall 112 and the outer ring wall 111 of the fan can also be prevented from being polluted by oil fume.

[0038] In the specification and claims of the present application, terms indicating directions, such as "front", "back", "upper", "lower", "left", "right", "side", "top", "bottom", etc. are used to describe various example structural parts and elements of the present application, but these terms are used herein only for the purpose of convenience of description and are determined based on the example orientation shown in the drawings. Since the disclosed embodiments of the present application can be arranged in different directions, these terms indicating directions are only used for description and should not be considered as limitation, for example, "upper" and "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity.

Claims

1. A centrifugal fan, comprising a volute (11) and an impeller (12) disposed inside the volute (11), characterized in that: The volute (11) has an outer ring wall (111) and an inner ring wall (112). An air gap (113) is formed between the outer ring wall (111) and the inner ring wall (112). The closed end of the outer ring wall (111) is sealed to the inner ring wall (112), and the open end of the outer ring wall (111) is formed to the inner ring wall (112) to form an air gap inlet (114). Hot air can enter the air gap (113) through the air gap inlet (114). Ventilation openings (115) are provided on the inner ring wall (112). The ventilation openings (115) are distributed circumferentially along the inner ring wall (112). The ventilation openings (115) form air outlets for the air jacket. Air guide vanes (116) are installed on the ventilation openings (115) to guide the airflow in the air jacket (113) into the internal air duct of the volute (11). The air jacket (113) is connected to the internal air duct of the volute (11) through the ventilation openings (115).

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

4. The centrifugal fan according to claim 3, characterized in that: The angle between the air guide 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. The angle γ increases or remains unchanged as the included angle α increases.

5. The centrifugal fan according to claim 1, characterized in that: The angle between the air guide 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° are satisfied.

6. The centrifugal fan according to claim 5, characterized in that: The angle γ decreases as the exit angle β increases, and increases as the exit angle β decreases.

7. The centrifugal fan according to claim 1, characterized in that: The shape of the vent (115) is square, round, elliptical, triangular or parallelogram, and correspondingly, the shape of the air guide (116) is square, round or elliptical or triangular or parallelogram.

8. 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), 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. The angle between the straight line N and the straight line P is θ, and 5° < θ ≤ 60°.

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

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

11. A refrigerated range hood, comprising a fume extraction module, a compressor (2), a heat dissipation module (3), and an indoor unit module (4), wherein the fume extraction module includes a fume extraction fan, the heat dissipation module (3) and the indoor unit module (4) are disposed outside the fume extraction fan, the heat dissipation module (3) includes a condenser (31) and a heat dissipation fan (32), and the indoor unit module (4) includes an evaporator (41) and an indoor unit fan (43), wherein the compressor (2), the condenser (31), and the evaporator (41) are connected by a refrigerant pipeline (5), and the fume extraction fan is a centrifugal fan (1) as described in any one of claims 1 to 10, characterized in that: The air outlet of the cooling fan (32) is connected to the air inlet (14) of the air jacket.

12. The refrigerated range hood according to claim 11, characterized in that: The cooling fan (32) is a centrifugal fan, and the central axis of the impeller (12) of the oil fume fan is parallel to the central axis of the impeller (12) of the cooling fan (32).

13. The refrigerated range hood according to claim 11, characterized in that: The cooling fan (32) is located above the fume extractor, with the air outlet of the cooling fan (32) facing downwards and toward the air inlet (14) of the air jacket.

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