Range hood and centrifugal fan and volute thereof

Abstract

The utility model provides an improved range hood and a centrifugal fan and a volute thereof. The volute for the range hood comprises a first side wall (1), a second side wall (2) and an annular wall (3), and the annular wall (3) is arranged between the first side wall (1) and the second side wall (2) in a connected mode and comprises an electric heating film (4) and a cover plate (6); the cover plate (6) is arranged to be suitable for being fixed on the outer surface of the annular wall (3); when the cover plate (6) is fixed to the outer surface of the annular wall (3), the electrothermal film (4) is located between the cover plate (6) and the annular wall (3), and the electrothermal film (4) is extruded and fixed to the outer surface of the annular wall (3) through the cover plate (6). Therefore, the electrothermal film is fixed on the outer surface of the annular wall by virtue of the cover plate, so that the fixation of the electrothermal film does not excessively depend on mucilage glue, and the electrothermal film is easy to pass a needle flame test.

Description

[Technical field]

[0001] The present application relates to the field of range hoods, and in particular to a centrifugal fan for a range hood and a volute for a range hood. [Background technology]

[0002] In Asia, due to the traditional cooking habit of stir-frying, the oil content in the smoke produced during cooking is particularly high. Therefore, the range hood used to extract the oil smoke produced during cooking has become an important household appliance that is indispensable in daily life. As people's requirements for the quality of life continue to increase, range hoods are also constantly upgraded and improved. For example, a range hood solution with an electric heating film has been proposed to achieve self-cleaning of the range hood. However, the electric heating film is generally fixed to the range hood by adhesive adhesion. In order to ensure the fixing effect of the electric heating film, a large amount of adhesive is used, so it is difficult to pass the needle flame test, which poses a safety hazard. Moreover, the electric heating film is fixed to the range hood by adhesive adhesion. The adhesive is prone to aging and reduced viscosity when working in a high temperature environment for a long time, which can easily cause the electric heating film to fall off.

[0003] In addition, there are also methods of fixing the electric heating film to the range hood with screws. However, this screw fixing method cannot make the electric heating film and the fixing surface completely close together, and there is a large gap between the electric heating film and the fixing surface, which affects the heat transfer efficiency.

[0004] Unless there is sufficient evidence to support it, the prior art described herein does not mean that the prior art is known to ordinary technicians in the field involved in this application before the filing date of this application. [Summary of the invention]

[0005] One purpose of the embodiments of the present application is to propose an improved range hood and its centrifugal fan and volute, in response to at least one of the above technical problems and / or other possible technical problems not mentioned in the present application.

[0006] According to the first aspect of the present application, an embodiment of the present application provides a volute for a range hood, comprising a first side wall, a second side wall and an annular wall, wherein the annular wall is connected and arranged between the first side wall and the second side wall, and comprises an electric heating film and a cover plate; the cover plate is configured to be suitable for being fixed to the outer surface of the annular wall; when the cover plate is fixed to the outer surface of the annular wall, the electric heating film is located between the cover plate and the annular wall, and the cover plate squeezes and fixes the electric heating film to the outer surface of the annular wall.

[0007] When the cover plate is fixed to the outer surface of the annular wall, the electric heating film is located between the cover plate and the annular wall, and the cover plate squeezes and fixes the electric heating film to the outer surface of the annular wall; thus, the electric heating film is fixed to the outer surface of the annular wall by means of the cover plate, so that the fixation of the electric heating film does not need to rely too much on glue, and the electric heating film is easy to pass the needle flame test.

[0008] In one or some embodiments,

[0009] The electric heating film is attached to the outer surface of the ring wall; and / or

[0010] The cover plate is in the shape of an arc-shaped plate with an opening facing upward, and the cover plate covers the lowest point of the outer surface of the annular wall.

[0011] The cover plate covers the lowest point of the outer surface of the annular wall. Obviously, the electric heating film also covers the lowest point of the outer surface of the annular wall. Therefore, the electric heating film specifically heats the grease attached to the bottom area of ​​the volute to liquefy and discharge it, and the range hood has a good self-cleaning effect.

[0012] In one or some embodiments, the cover plate is in the shape of a groove; when the cover plate is fixed to the outer surface of the annular wall, the groove edge of the cover plate is pressed against the electric heating film, and the groove bottom of the cover plate is spaced a certain distance from the electric heating film.

[0013] The groove of the cover plate is pressed against the electric heating film, thereby pressing and fixing the electric heating film to the outer surface of the ring wall, and making the electric heating film tightly attached and fixed to the outer surface of the ring wall, and the heat transfer efficiency from the electric heating film to the ring wall is high.

[0014] The groove bottom of the cover plate is spaced a certain distance from the electric heating film, thereby reducing the heat transfer of the electric heating film to the groove bottom of the cover plate. The heat of the electric heating film is focused on heating the volute, so that the grease attached to the bottom area of ​​the volute is liquefied and discharged, and the range hood has a good self-cleaning effect.

[0015] In one or some embodiments, adhesive is provided between the electric heating film and the outer surface of the annular wall, so that the electric heating film adheres to the outer surface of the annular wall, so that the cover plate can be installed outside the electric heating film.

[0016] In one or some embodiments, the electric heating film is square, and the adhesive is only provided at the four corners of the electric heating film. Thus, the fixing of the electric heating film does not need to be overly dependent on the adhesive, and the electric heating film is easy to pass the needle flame test.

[0017] In one or some embodiments, the adhesive is only disposed at the corners and / or edges of the electric heating film. Thus, the fixing of the electric heating film does not need to be overly dependent on the adhesive, and the electric heating film is easy to pass the needle flame test.

[0018] In one or some embodiments, the adhesive is configured such that the electric heating film can pass a needle flame test.

[0019] In one or some embodiments, the cover plate is fixed to the outer surface of the annular wall by screws.

[0020] In one or some embodiments, the annular wall is provided with an oil leakage hole; the electric heating film is provided with a first through hole; the cover plate is provided with a second through hole; the oil leakage hole, the first through hole and the second through hole overlap, and are arranged in sequence from top to bottom.

[0021] In one or some embodiments, the electric heating film is completely shielded by the cover plate. Thus, the cover plate is used to fix the electric heating film and provide shielding for the electric heating film, thereby avoiding or reducing the contamination of the electric heating film by grease, and prolonging the service life of the electric heating film. Moreover, the cover plate isolates the electric heating film from the user, which can prevent the electric heating film from accidentally scalding the user.

[0022] In particular, when the cover plate is fixed to the outer surface of the annular wall, the groove edge of the cover plate is pressed against the electric heating film, and the groove bottom of the cover plate is spaced a certain distance from the electric heating film. If the electric heating film is completely blocked by the cover plate, the heat of the electric heating film is focused on heating the volute, so that the grease attached to the bottom area of ​​the volute is liquefied and discharged, and the self-cleaning effect of the range hood is good.

[0023] According to a second aspect of the present application, an embodiment of the present application provides a centrifugal fan for a range hood, comprising a volute as described in any one of the above items.

[0024] According to a third aspect of the present application, an embodiment of the present application provides a range hood comprising the centrifugal fan as described above.

[0025] It should be noted here that directional expressions such as "from top to bottom", "below", "lowest point", "top" etc. appearing in this application, unless otherwise specified, are based on the usual usage state of the range hood.

[0026] It should be pointed out here that the “first”, “second” and “third” appearing in this specification are only used for descriptive purposes and are not used to indicate relative importance; moreover, they are not a definition of the quantity of the features they define; in addition, they are not a definition of the logical or sequential relationship of the features they define.

[0027] The above technical solutions of the present application are not intended to describe all possible implementations of the present application. Throughout the application, guidance is provided by listing examples in many places, and these examples can be used in various feasible combinations.

Brief Description of the Drawings

[0028] The following drawings are only used to illustrate and explain the present application, and do not limit the scope of the present application, wherein:

[0029] Figure 1It is a structural schematic diagram of an electric heating film of a volute embodiment for a range hood of the present application;

[0030] Figure 2 yes Figure 1 A schematic diagram of the structure of the electric heating film shown in another viewing angle;

[0031] Figure 3 This is a schematic structural diagram of a centrifugal fan embodiment for a range hood of the present application before a cover plate is installed;

[0032] Figure 4 yes Figure 3 The schematic diagram of the structure of the centrifugal fan embodiment for a range hood after a cover plate is installed;

[0033] Figure 5 yes Figure 4 The structure schematic diagram of the centrifugal fan embodiment for a range hood shown in another viewing angle.

[0034] Reference numerals:

[0035] 1-first side wall, 2-second side wall, 3-annular wall, 4-electric heating film, 5-power supply cable, 6-cover plate, 7-groove edge, 8-groove bottom, 9-double-sided tape, 10-oil leakage hole, 11-first through hole, 12-second through hole, 13-electric motor, 14-impeller, 15-fixing bracket. [Specific implementation method]

[0036] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present application clearer, the present application will be further described in detail in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the scope of protection of the present application, and each embodiment may share the same view or multiple views for description, but all features appearing in the same figure cannot be interpreted as features that must be possessed by an embodiment. On the contrary, as long as they are not mutually exclusive technically, they can be combined in any suitable manner. Moreover, for the sake of simplicity, different embodiments of different aspects may be presented in the same specific design, but such presentation does not mean that the embodiments of these aspects should appear together. The disassembly and / or combination of all possible embodiments and / or technical features should also take into account the description of the specification and the content that can be directly and unambiguously determined by those skilled in the art based on the description of the specification.

[0037] The present application proposes a centrifugal fan embodiment for a range hood, comprising a volute, an electric motor 13 and an impeller 14, as shown in FIG. Figure 3 , 45. The impeller 14 is a multi-blade centrifugal impeller. The electric motor 13 and the impeller 14 are both arranged in the volute. The electric motor 13 is configured to drive the impeller 14 to rotate, thereby forming a negative pressure to form an airflow to exhaust the oil smoke.

[0038] The volute comprises a first side wall 1, a second side wall 2 and an annular wall 3. The annular wall 3 is connected and arranged between the first side wall 1 and the second side wall 2. Figure 3 , 4 As shown in Figure 5, the first side wall 1 and / or the second side wall 2 is provided with an air inlet. The top of the volute is provided with an air outlet. The air outlet is formed by the top edge of the first side wall 1, the top edge of the second side wall 2 and the top edge of the annular wall 3.

[0039] When the centrifugal fan is running, the oil smoke airflow flows into the volute from the air inlet, flows through the inner cavity of the volute, and then flows out from the air outlet of the volute. Since the oil smoke airflow carries a lot of grease, a lot of grease will eventually adhere to the inner wall of the volute and gather to the bottom area of ​​the volute under the action of gravity.

[0040] The spiral case includes an electric heating film 4 and a cover plate 6, such as Figure 3 , 4 As shown in Figure 5, the electric heating film 4 and the cover plate 6 are both arranged on the ring wall 3. Specifically, the electric heating film 4 and the cover plate 6 are both fixed to the outer surface of the ring wall 3. Figure 3 It is a schematic structural diagram when only the electric heating film 4 is arranged on the annular wall 3 but the cover plate 6 is not arranged yet. Figure 4 and 5 It is a schematic structural diagram when the electric heating film 4 and the cover plate 6 are both arranged on the annular wall 3 .

[0041] The electric heating film 4 is square, such as Figure 1 and 2 The “electric heating film 4 is in a square shape” can be understood as: the electric heating film 4 is in a square shape when laid flat.

[0042] The electric heating film 4 is attached to the outer surface of the ring wall 3, such as Figure 3 It should be noted that the electric heating film 4 is a flexible member, and the electric heating film 4 is suitable for bending to adapt to the structure of the outer surface of the annular wall 3 to which it is attached.

[0043] The cover plate 6 is configured to be fixed to the outer surface of the annular wall 3, such as Figure 4 and 5As shown. When the cover plate 6 is fixed to the outer surface of the annular wall 3, the electric heating film 4 is located between the cover plate 6 and the annular wall 3, and the cover plate 6 squeezes and fixes the electric heating film 4 to the outer surface of the annular wall 3. Specifically, the electric heating film 4 is first arranged on the outer surface of the annular wall 3, and then the cover plate 6 is fixed to the outer surface of the annular wall 3. When the cover plate 6 is fixed to the outer surface of the annular wall 3, the cover plate 6 squeezes the electric heating film 4 toward the outer surface of the annular wall 3, so that the electric heating film 4 is firmly fixed between the outer surface of the annular wall 3 and the cover plate 6. The electric heating film 4 is not visible because it is blocked by the cover plate 6.

[0044] The annular wall 3 is provided with an oil leakage hole 10. The oil leakage hole 10 is located at the lowest point of the annular wall 3. The electric heating film 4 is provided with a first through hole 11, such as Figure 1 and 2 As shown. The cover plate 6 is provided with a second through hole 12. The oil leakage hole 10, the first through hole 11 and the second through hole 12 are overlapped, and the three are arranged in sequence from top to bottom, as shown. Figure 3 and 4 shown.

[0045] The electric heating film 4 is provided with two power supply cables 5, such as Figure 1 and 2 As shown. The power supply cable 5 is used to supply power to the electric heating film 4. After the electric heating film 4 is powered on, the electric heating film 4 heats the outer surface of the ring wall 3, thereby increasing the temperature of the volute, causing the grease attached to the volute to liquefy and flow through the oil leakage hole 10, the first through hole 11 and the second through hole 12 in sequence to be discharged, and then the grease flows downward and finally flows into the oil cup of the range hood to achieve self-cleaning of the range hood. In particular, considering that the grease gathers in the bottom area of ​​the volute, the outer surface of the ring wall 3 heated by the electric heating film 4 is exactly the outer wall of the bottom area of ​​the volute, thereby having strong targeting and good grease liquefaction effect.

[0046] After the electric heating film 4 is energized, the electric heating film 4 heats the outer surface of the annular wall 3 to increase the temperature of the volute, and a portion of the heat will be conducted to the impeller 14, so that the grease attached to the impeller 14 is liquefied and drips down to the bottom area of ​​the volute, and then flows through the oil leakage hole 10, the first through hole 11 and the second through hole 12 in sequence to be discharged, and then the grease flows downward and finally flows into the oil cup of the range hood, thereby realizing the self-cleaning of the range hood.

[0047] The cover plate 6 is fixed to the outer surface of the ring wall 3 by screws. The cover plate 6 is in the shape of an arc plate with an opening facing upwards, and the cover plate 6 covers the lowest point of the outer surface of the ring wall 3. The cover plate 6 is in the shape of a groove. Specifically, the cover plate 6 is in the shape of a groove with an arched bottom. When the cover plate 6 is fixed to the outer surface of the ring wall 3, the bottom of the groove of the cover plate 6 is arched downwards, such as Figure 4 and 5 shown.

[0048] When the cover plate 6 is fixed to the outer surface of the annular wall 3, the groove edge 7 of the cover plate 6 is pressed against the electric heating film 4, and the groove bottom 8 of the cover plate 6 is spaced a certain distance from the electric heating film 4. Due to the pressing of the groove edge 7 of the cover plate 6, the electric heating film 4 is in close contact with the outer surface of the annular wall 3, and the heat conduction efficiency is high, which not only saves energy but also helps to improve the melting effect. Preferably, the groove edge 7 of the cover plate 6 is pressed against the electric heating film 4, such as Figure 4 and 5 As shown, the electric heating film 4 is closely attached to the outer surface of the annular wall 3 .

[0049] The electric heating film 4 is completely shielded by the cover plate 6. Figure 4 and 5 As shown. Since the groove bottom 8 of the cover plate 6 is at a certain distance from the electric heating film 4, the heat of the electric heating film 4 is not easy to be transferred to the groove bottom 8 of the cover plate 6. As a result, the heat of the electric heating film 4 is concentrated and transferred to the annular wall 3, and the heating efficiency of the volute is high. At the same time, the setting of the cover plate 6 effectively isolates the electric heating film 4 and the user, preventing the user from accidentally touching the volute during heating and scalding. Moreover, with the protection of the cover plate 6, the electric heating film 4 is isolated from the oil fume airflow, which helps to increase the service life of the electric heating film 4. Preferably, the cover plate 6 is a heat insulation plate.

[0050] There is adhesive between the electric heating film 4 and the outer surface of the ring wall 3, so that the electric heating film 4 adheres to the outer surface of the ring wall 3, so as to perform the assembly operation of installing the cover plate 6 outside the electric heating film 4. It should be noted here that the final fixation of the electric heating film 4 depends on the cover plate 6, and the adhesive adhering the electric heating film 4 to the outer surface of the ring wall 3 is only a temporary fixation, and the temporary fixation only needs to satisfy the state that the electric heating film 4 adheres to the outer surface of the ring wall 3 until the cover plate 6 is installed outside the electric heating film 4. The cover plate 6 is a non-flammable plate body. Therefore, the adhesive arranged between the electric heating film 4 and the outer surface of the ring wall 3 can be as little as possible, so that the electric heating film 4 can pass the needle flame test, because the less adhesive, the less likely it is to be ignited. In other words, the adhesive is arranged so that the electric heating film 4 can pass the needle flame test. It should be noted here that the so-called "non-flammable plate body" can be understood as: the non-flammability of the plate body meets the degree of passing the needle flame test.

[0051] The adhesive is only provided at the corners and / or edges of the electric heating film 4. For example, the adhesive is only provided at the four corners of the electric heating film 4. Specifically, the adhesive is a double-sided adhesive tape 9. The area of ​​the double-sided adhesive tape 9 at any corner of the electric heating film 4 is not greater than 150 mm. 2 Preferably, the double-sided adhesive tape 9 at any corner of the electric heating film 4 is in the shape of a square with a side length of 10 mm. Figure 1 and 2 As shown. Therefore, the double-sided adhesive tape 9 has a small area, so that the electric heating film 4 can easily pass the needle flame test, and the double-sided adhesive tape 9 is used in a small amount, which saves costs.

[0052] The present application also proposes an embodiment of a range hood, comprising a housing, a fume hood, a power module and the above-mentioned centrifugal fan embodiment. The housing and the fume hood are arranged in sequence from top to bottom. The centrifugal fan is arranged in the housing. Specifically, the volute of the centrifugal fan is provided with a fixing bracket 15 for fixing the centrifugal fan to the housing. The fixing bracket 15 is arranged on the second side wall 2 of the volute, such as Figure 3 , 4 and 5.

[0053] The power module is electrically connected to the power supply cable 5 of the electric heating film 4 . The power module is configured to supply power to the electric heating film 4 via the power supply cable 5 .

[0054] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even when only a single embodiment is described with respect to specific features. The feature examples provided in the present disclosure are intended to be illustrative, not limiting, unless otherwise expressly stated. In specific implementations, multiple features can be combined with each other where technically feasible, depending on actual needs. Various substitutions, changes, and modifications may also be conceived without departing from the spirit and scope of the present application.

Claims

1. A volute for a range hood, comprising a first side wall (1), a second side wall (2) and an annular wall (3), wherein the annular wall (3) is connected and arranged between the first side wall (1) and the second side wall (2), characterized in that: It comprises an electric heating film (4) and a cover plate (6); The cover plate (6) is configured to be fixed to the outer surface of the annular wall (3); When the cover plate (6) is fixed to the outer surface of the annular wall (3), the electric heating film (4) is located between the cover plate (6) and the annular wall (3), and the cover plate (6) squeezes and fixes the electric heating film (4) to the outer surface of the annular wall (3).

2. The volute according to claim 1, characterized in that: The electric heating film (4) is attached to the outer surface of the annular wall (3); and / or The cover plate (6) is in the shape of an arc-shaped plate with an opening facing upward, and the cover plate (6) covers the lowest point of the outer surface of the annular wall (3).

3. The volute according to claim 2, characterized in that: The cover plate (6) is in a groove shape; When the cover plate (6) is fixed to the outer surface of the annular wall (3), the groove edge (7) of the cover plate (6) is pressed against the electric heating film (4), and the groove bottom (8) of the cover plate (6) is spaced a certain distance from the electric heating film (4).

4. The volute according to claim 1, characterized in that: Adhesive is provided between the electric heating film (4) and the outer surface of the annular wall (3), so that the electric heating film (4) adheres to the outer surface of the annular wall (3), so that the cover plate (6) can be installed outside the electric heating film (4).

5. The volute according to claim 4, characterized in that: The electric heating film (4) is square; The adhesive is only arranged at the four corners of the electric heating film (4).

6. The volute according to claim 4, characterized in that: The adhesive is only arranged at the corners and / or edges of the electric heating film (4).

7. The volute according to claim 4, characterized in that: The adhesive is arranged in such a way that the electric heating film (4) can pass the needle flame test.

8. The volute according to claim 1, characterized in that: The cover plate (6) is fixed to the outer surface of the annular wall (3) by means of screws.

9. The volute according to claim 1, characterized in that: The annular wall (3) is provided with an oil leakage hole (10); The electric heating film (4) is provided with a first through hole (11); The cover plate (6) is provided with a second through hole (12); The oil leakage hole (10), the first through hole (11) and the second through hole (12) are overlapped and arranged in sequence from top to bottom.

10. The volute according to any one of claims 1 to 9, characterized in that: The electric heating film (4) is completely shielded by the cover plate (6).

11. A centrifugal fan for a range hood, characterized in that: Comprising the volute as claimed in any one of claims 1 to 10.

12. A range hood, characterized in that: Comprising the centrifugal fan as claimed in claim 11.

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