Centrifugal fan and refrigeration type range hood provided with same

Abstract

The centrifugal fan comprises a volute and an impeller, the volute comprises a volute annular wall, the volute annular wall comprises an outer annular wall and an inner annular wall, an air inlet cavity is formed between the outer annular wall and the inner annular wall, the air inlet cavity is provided with an air inlet, an opening is formed in the inner annular wall, and the impeller is arranged in the volute annular wall. The openings are distributed in the circumferential direction of the inner ring wall at intervals, and the air inlets communicate with an air outlet of the draught fan through the openings. When the range hood works in a refrigeration mode, outlet air of the heat dissipation fan passes through the air inlet cavity, then enters the range hood volute through the opening of the inner ring wall and then is brought to the outside by air of the oil smoke suction fan, and due to the fact that the air blown out of the heat dissipation fan does not contain oil smoke, the outlet air of the heat dissipation fan passes through most of the inner ring wall of the range hood fan, and the oil smoke suction fan does not contain oil smoke. Oil fume airflow can be blocked by hot air blown out by the cooling fan and cannot pass through the inner sides of the inner ring wall and the outer ring wall of the volute, so that the inner sides of the inner ring wall and the outer ring wall of the volute cannot be polluted by the oil fume, and the problem that the oil fume is attached to the inner surface of the volute and is difficult to clean is solved.

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] The fan of the range hood generally adopts a centrifugal fan. After long-term use, the inner wall of the volute of the fan of the existing range hood 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 removed to clean the impeller, which is not only inconvenient to clean, but also the inner wall of the volute is not easy to clean. In addition, in order to solve the pain point of the hot kitchen when cooking in summer, people invented a refrigeration range hood, which adds an air conditioning component on the basis of the range hood platform, which can realize all the functions of the range hood and the function of the air conditioner. When working in the cooling mode, the condenser needs to dissipate heat. At present, a heat dissipation fan is usually used to dissipate heat for the condenser, such as the "A Refrigeration Type Range Hood" disclosed in the Chinese Utility Model Patent with Application Number CN202320059220.6 (Authorization Announcement Number CN 219222570 U). The range hood includes a fume extraction module, an air-conditioning outdoor unit module and an air-conditioning indoor unit module. The fume extraction module includes a fan frame and a fume extraction fan. The air-conditioning outdoor unit module and the air-conditioning indoor unit module are arranged outside the fan frame. The air-conditioning outdoor unit module includes a heat dissipation cavity, a condenser and a heat dissipation fan. The heat dissipation cavity is arranged outside the fan frame, and the condenser is installed inside the heat dissipation cavity. The heat dissipation fan is located outside the heat dissipation cavity and installed on the top of the heat dissipation cavity. The heat dissipation fan outlet faces the inside of the heat dissipation cavity, and the heat dissipation cavity has a heat dissipation outlet connected to the air inlet of the fume extraction fan. The heat of the condenser of the refrigeration-type range hood enters the range hood fan through the heat dissipation outlet and is then taken away by the range hood fan, but the hot air blown by the heat dissipation fan is not effectively utilized, resulting in heat waste. In summary, the existing refrigeration-type 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 capable of preventing the inner surface of the volute from being polluted by oil smoke 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 equipped with the centrifugal fan according 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 volute ring wall, characterized in that: the volute ring wall includes an outer ring wall and an inner ring wall, an air inlet cavity is formed between the outer ring wall and the inner ring wall, the air inlet cavity has an air inlet, the inner ring wall is provided with an opening, the openings are distributed at intervals along the circumference of the inner ring wall, and the air inlet is connected to the fan outlet through the opening.

[0006] In order to guide the airflow in the air inlet cavity into the inner side of the inner ring wall of the volute, the opening has an air guide plate bent toward the inner side of the inner ring wall.

[0007] In order to reduce the operating noise of the fan, noise reduction holes are opened on the air guide plate.

[0008] The noise reduction holes may be arranged in a variety of ways. Preferably, the apertures of the noise reduction holes are equal, or the apertures of the noise reduction holes gradually increase along the airflow direction.

[0009] In order to obtain a better noise reduction effect, the diameter D of the impeller and the aperture d of the noise reduction hole satisfy D / 200≤d≤D / 100.

[0010] Further preferably, the air guide vanes at the upstream end of the air inlet cavity and the air guide vanes at the downstream end of the air inlet cavity are both arranged above the horizontal plane where the central axis of the impeller is located.

[0011] Further preferably, along the air flow direction, the thickness of the air inlet cavity gradually increases or remains the same.

[0012] 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.

[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 a refrigeration module, the range hood module includes a range hood fan, the heat dissipation module and the refrigeration module are arranged on the outside of the range hood fan, the heat dissipation module includes a condenser and a heat dissipation fan, the refrigeration module includes an evaporator and an indoor fan, the compressor, condenser and evaporator are connected by a refrigerant pipeline, and it 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 cavity, the heat dissipation fan is a centrifugal fan, and the impeller center axis of the range fumes suction fan is parallel to the impeller center axis of the heat dissipation fan. 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 inlet cavity.

[0015] Compared with the prior art, the utility model has the advantages that an air inlet cavity is formed between the outer annular wall and the inner annular wall of the volute of the centrifugal fan. When the refrigeration type range hood operates in the refrigeration mode, the air outlet of the heat dissipation fan will pass through the air inlet cavity between the inner annular wall and the outer annular wall, and then enter the volute of the range hood through the opening of the inner annular wall, and then be carried to the outdoors by the wind of the range hood fan. Since the air blown out by the heat dissipation fan does not contain oil smoke, the air outlet of the heat dissipation fan will pass through most of the inner annular 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 will not pass through the inner annular wall and the inner side of the outer annular wall of the volute, so that the inner annular wall and the inner side of the outer annular wall of the volute will not be contaminated by oil smoke, thereby solving the problem that 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 problem of oil smoke contaminating the inner surface of the volute can also be avoided by controlling to turn on the heat dissipation fan alone. 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 structural schematic diagram of the centrifugal fan from another angle is shown;

[0018] Figure 3 This is a schematic structural diagram of a refrigeration-type range hood according to an embodiment of the utility model;

[0019] Figure 4 for Figure 3 Another structural schematic diagram of the refrigeration type range hood shown;

[0020] Figure 5 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

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] like Figures 1 to 4As shown, 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 volute ring wall, wherein the volute ring wall includes an outer ring wall 111 and an inner ring wall 112, an air inlet cavity 113 is formed between the outer ring wall 111 and the inner ring wall 112, the air inlet cavity 113 has an air inlet 114, an opening 115 is formed on the inner ring wall 112, the openings 115 are distributed along the circumferential direction of the inner ring wall 112, and the air inlet 114 is connected to the fan outlet 14 through the opening 115. In this embodiment, along the flow direction of the airflow, the thickness of the air inlet cavity 113 gradually increases or is equal. A volute tongue 13 is installed at the starting end of the volute 11 type line, and the air inlet 114 is close to the starting end of the volute 11 type line.

[0023] The opening 115 has an air guide piece 116 bent toward the inner side of the inner annular wall 112. After the air guide piece 116 is provided, the airflow in the air inlet cavity 113 can enter the interior of the volute 11 through the opening 115. In this embodiment, the air guide piece 116 at the upstream end of the air inlet cavity 113 and the air guide piece 116 at the downstream end of the air inlet cavity 113 are both provided above the horizontal plane where the central axis of the impeller 12 is located, that is, the air guide piece 116 surrounds most of the outer periphery of the impeller 12, and accordingly, the opening 115 on the inner annular wall 111 also surrounds most of the outer periphery of the impeller 12.

[0024] After the opening 115 is provided on the inner ring wall 111, the fan noise will increase. Therefore, the centrifugal fan of this embodiment has a noise reduction hole 117 on the air guide plate 116. The aperture of the noise reduction hole 117 can be equal in size, or the aperture of the noise reduction hole 117 can gradually increase along the air flow direction. After the noise reduction hole 117 is provided on the air guide plate 116, the noise during the operation of the fan can be reduced. In addition, the aperture d of the noise reduction hole 117 and the diameter D of the impeller 12 need to satisfy D / 200≤d≤D / 100.

[0025] like Figure 5 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.

[0026] 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 central axis of the impeller of the range hood 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 hood fan 1, and the air outlet of the heat dissipation fan 32 faces downward and toward the air inlet 114 of the air inlet chamber 113, and the air outlet of the heat dissipation fan 32 is connected to the air inlet 114.

[0027] When the refrigeration range hood is working in the cooling mode, the hot air blown by the heat dissipation fan 32 enters the air inlet cavity 113 from the air inlet 114, then enters the interior of the volute 11 through the opening 115 of the inner ring wall 111, 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 air outlet of the heat dissipation fan will pass through most of the inner ring wall of the range hood fan, and the oil smoke airflow will be blocked by the hot air blown by the heat dissipation fan and will not pass through the inner ring wall and the inner side of the outer ring wall of the volute, so that the inner ring wall and the inner side of the outer ring 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 addition, in the mode of turning on the range hood alone and not turning on the cooling 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 opening 115 also plays a role in blocking oil smoke, and the above-mentioned effect can also be achieved.

[0028] 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 volute annular wall, characterized in that: The volute annular wall comprises an outer annular wall (111) and an inner annular wall (112); an air inlet cavity (113) is formed between the outer annular wall (111) and the inner annular wall (112); the air inlet cavity (113) has an air inlet (114); the inner annular wall (112) is provided with an opening (115); the openings (115) are distributed at intervals along the circumference of the inner annular wall (112); the air inlet (114) is connected to the fan outlet (14) through the opening (115).

2. The centrifugal fan according to claim 1, characterized in that: The opening (115) has an air guide plate (116) bent toward the inner side of the inner annular wall (112).

3. The centrifugal fan according to claim 2, characterized in that: The air guide piece (116) is provided with a noise reduction hole (117).

4. The centrifugal fan according to claim 3, characterized in that: The apertures of the noise reduction holes (117) are equal in size, or the apertures of the noise reduction holes (117) gradually increase along the flow direction of the airflow.

5. The centrifugal fan according to claim 3, characterized in that: The diameter D of the impeller (12) and the aperture d of the noise reduction hole (117) satisfy D / 200≤d≤D / 100.

6. The centrifugal fan according to claim 1, characterized in that: The air guide vane (116) located at the upstream end of the air inlet cavity (113) and the air guide vane (116) located at the downstream end of the air inlet cavity (113) are both arranged above the horizontal plane where the central axis of the impeller (12) is located.

7. The centrifugal fan according to claim 1, characterized in that: Along the flow direction of the air flow, the thickness of the air inlet cavity (113) gradually increases or remains the same.

8. The centrifugal fan according to claim 1, characterized in that: A volute tongue (13) is installed at the starting end of the volute (11) profile, and the air inlet (114) is close to the starting end of the volute (11) profile.

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 (114) of the air inlet cavity (113).

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 (12) of the range fumes suction fan (1) 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 fumes suction fan (1), and the air outlet of the heat dissipation fan (32) faces downward and toward the air inlet (114) of the air inlet chamber (113).

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