CN219222542U - Air outlet cover and range hood with same - Google Patents

Abstract

The utility model discloses an air outlet cover and a range hood with the same, wherein the air outlet cover comprises a cover body, the cover body is provided with a bottom part used for being connected with a fan system and a top part used for being connected with a smoke exhaust pipe, two inlets are formed in the bottom part of the cover body, the top part of the cover body is opened to form an outlet, the part of the bottom part of the cover body positioned between the two inlets is upwards protruded to form a separating piece, and the profile line of the vertical section of the separating piece is a spline curve passing through three vertexes of a triangle. Compared with the prior art, the utility model has the advantages that: through setting up the separator to set the contour line of the vertical cross-section of separator as the spline curve that passes through three summit of triangle-shaped, the air current gets into along the separator from the import and merges, does not have low energy fluid region at the stage of merging, prevents that two fan export airflows from producing serious flow loss before the meeting, and follow-up flow is incomplete even after the meeting, thereby destroys the periodic pulsation of fan export airflows, noise and abnormal sound are reduced.

Description

Air outlet cover and range hood with same

Technical Field

The utility model relates to a lampblack purifying device, in particular to an air outlet cover and a range hood with the air outlet cover.

Background

The range hood has become one of the indispensable kitchen appliances in modern families. The range hood works by utilizing the fluid dynamics principle, and the range hood sucks and discharges oil smoke through a centrifugal fan arranged in the range hood and filters part of grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor for driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated at the center of the fan, and oil smoke below the range hood is sucked into the fan and is collected by the volute after being accelerated by the fan to be guided to be discharged out of the room.

In order to improve the performance of the fan under a limited space, the existing range hood adopts a scheme of parallel connection of double fans. The utility model patent of China with the application number of 201420867379.1 discloses a fan and a range hood, wherein the fan comprises a volute, a double-shaft motor and two impellers, the volute comprises two air cavities which are arranged in parallel, the double-shaft motor is fixedly connected with the volute, the two impellers are respectively and fixedly connected with two rotating shafts of the double-shaft motor, and an air outlet channel is formed by the impellers and the air cavities.

The existing range hood is generally provided with an air outlet cover at the air outlet of the fan, and the air outlet cover has the functions of collecting air, guiding flow and connecting the range hood with an air outlet pipe. However, the current double-fan range hood does not provide a requirement for the design of an air outlet cover at the rear end of a fan, and secondary flow is easy to generate at the junction of two fan air channels, so that the performance of the fan is reduced.

Disclosure of Invention

The first technical problem to be solved by the utility model is to provide an air outlet cover for reducing flow loss and noise aiming at the defects in the prior art.

The second technical problem to be solved by the utility model is to provide a range hood with the air outlet cover.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: the utility model provides an air-out cover, includes the cover body, the cover body has relative bottom that is used for being connected with fan system and is used for the top of being connected with the exhaust pipe, two inlets have been seted up to the bottom of the cover body, the top of the cover body is uncovered and is formed the export, its characterized in that:

the part of the bottom of the cover body between the two inlets is upwards protruded to form a partition piece, and the profile line of the vertical section of the partition piece is a spline curve passing through three vertexes of a triangle.

Through setting up the separator in the air-out cover to set up the contour line of the vertical cross-section of separator as the spline curve that passes through triangle-shaped three summit, the air current gets into along the separator from the import and merges, does not have low energy fluid region in the stage of merging, prevents that two fan export airflows from producing serious flow loss before the meeting, and the follow-up flow is incomplete even after the merging, thereby destroys the periodic pulsation of fan export airflows, noise and abnormal sound are reduced.

Preferably, the vertex angle alpha of the triangle through which the spline curve passes is less than or equal to 90 degrees, so that the occurrence of a low-speed area after merging is further avoided, and the flow efficiency is lost.

Preferably, the vertical section of the cover body is trapezoid, the base angle of the cover body is beta 1, the included angle between the tangent line at the starting point of the spline curve and the bottom of the cover body is beta 2, and the angle is smaller than 5 degrees |beta 1-beta 2|, so that the area change of the flow section of the air flow in the air outlet cover is smaller, the air flow is prevented from serious throttling or diffusion to generate flow loss, the air flow is ensured to flow stably before the air flow is intersected, and the serious flow loss of the two fan outlet air flows before the air flow is intersected is prevented.

Preferably, the spline curve is an arc or a conical curve.

Preferably, the height of the partition is lower than the cover.

The utility model solves the second technical problem by adopting the technical proposal that: a range hood comprising a fan system, characterized in that: the fan system comprises two fans which are arranged in parallel, and the inlet corresponds to the air outlet of the fans.

For being convenient for set up fan system and air-out cover, the range hood still includes the fan frame, fan system sets up in the fan frame, the air-out cover sets up in the fan frame top outside.

Compared with the prior art, the utility model has the advantages that: the partition piece is arranged in the air outlet cover, and the contour line of the vertical section of the partition piece is set to be a spline curve passing through three vertexes of a triangle, air flows enter from the inlet and are converged along the partition piece, a low-energy fluid area does not exist in the converging stage, serious flow loss of two fan outlet air flows before the two fan outlet air flows are converged is prevented, the flow is not completely uniform after the two fan outlet air flows are converged, periodic pulsation of the fan outlet air flows is damaged, and noise and abnormal sound are reduced; the vertex angle alpha of the triangle through which the spline curve passes is less than or equal to 90 degrees, so that a low-speed area is further avoided after the spline curve is converged, and the flow efficiency is further reduced; the base angle of the cover body is beta 1, the included angle between the tangent line at the starting point of the spline curve and the bottom of the cover body is beta 2, and the angle is smaller than 5 degrees, so that the area change of the flow section of the air flow in the air outlet cover is smaller, the air flow is prevented from experiencing serious throttling or diffusion to generate flow loss, the air flow is ensured to flow stably before the air flow is intersected, and the serious flow loss of the two fan outlet air flows before the air flow is intersected is prevented.

Drawings

Fig. 1 is a schematic view of a range hood according to an embodiment of the present utility model;

fig. 2 is a sectional view of a range hood according to an embodiment of the present utility model;

fig. 3 is a schematic view of an air outlet cover of a range hood according to a first embodiment of the present utility model;

FIG. 4 is a cross-sectional view taken along A-A of FIG. 3;

fig. 5 is a sectional view of an outlet cover of a range hood according to a second embodiment of the present utility model.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for purposes of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and because the disclosed embodiments of the present utility model may be arranged in different orientations, these directional terms are merely for illustration and should not be construed as limitations, such as "upper", "lower" are not necessarily limited to orientations opposite or coincident with the direction of gravity. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly.

Example 1

Referring to fig. 1 to 4, a range hood 100 includes a fan system 1 and an air outlet cover 2 disposed at an air outlet of the fan system 1, wherein the fan system 1 includes two fans 11 disposed in parallel, and the fans 11 are centrifugal fans. The fan system 1 is mounted in a fan housing 3, and the air outlet cover 2 is arranged above the top of the fan housing 3 (outside the top of the fan housing 3).

The air outlet cover 2 comprises a hollow cover body 21, wherein the cover body 21 is provided with a bottom and a top which are opposite, the bottom of the cover body 21 is connected with the fan system 1, and the bottom of the cover body 21 is used for being connected with a smoke exhaust pipe (not shown). Two inlets 22 are formed in the bottom of the cover body 21 connected with the fan system 1, and each inlet 22 corresponds to an air outlet of one fan 11. Since the air outlet of the blower 11 is rectangular, the inlet 22 is also rectangular and is sized to fit the air outlet of the blower 11. The top of the cover body 21 is open to form an outlet 23, and the outlet 23 is circular and has the same shape and size as the smoke exhaust pipe.

The cross section of the cover body 21 of the air outlet cover 2 on the vertical axis surface (the direction A-A shown in fig. 3, the vertical surface in the mounted state, extending in the left-right direction) is trapezoidal. The outlet hood 2 further comprises a partition 24. The partition 24 is formed by the portion of the bottom of the housing 21 located between the two inlets 22 protruding in the direction of the outlet 23. The contour line of the cross section of the separator 24 is a spline L passing through three vertices of a triangle. In this embodiment, the spline curve L is a circular arc. The height of the partition 24 is smaller than the housing 21, i.e. the top of the partition 24 is lower than the outlet 23 of the housing 21.

The vertex angle alpha of the triangle through which the spline curve L passes is less than or equal to 90 deg., and when alpha >90 deg., the two airflows flowing in from the two inlets 22 present a low-speed region at the junction (the vertex of the triangle located above), losing flow efficiency. The base angle of the cover body 21 is beta 1, the included angle between the tangent line at the starting point of the spline curve L (the joint with the inlet 22) and the bottom of the cover body 21 is beta 2, and |beta 1-beta 2| < 5 degrees is satisfied, the purpose is to make the area change of the flow section (flow cross section, horizontal plane shown in fig. 4) of the air flow in the air outlet cover 2 smaller, avoid serious throttling or diffusion to generate flow loss, ensure the air flow to flow smoothly before intersection, and the flow speed of the main flow area has small change.

The contour line should be a spline curve L passing through three vertexes of a triangle and should not directly adopt a triangle, because even if a triangle with a proper vertex angle is adopted, after the triangle is split, although no low-energy fluid area exists in the merging stage of two airflows, the merged flow is too smooth, so that the pneumatic noise respectively transmitted by the two fans 11 in parallel always keeps respective periodic pulsation and superposition after the runners are merged, and the noise or abnormal noise problem is possibly aggravated; the simulation results of spline curve separation show that the flow is not completely uniform after the flow is converged, so that the periodic pulsation of the air flow at the outlet of the fan is destroyed.

Example two

Referring to fig. 5, in the present embodiment, the spline curve L is a conic curve, which is different from the first embodiment described above.

Claims (7)

1. The utility model provides an air-out cover, includes the cover body (21), the cover body (21) have relative bottom that is used for being connected with fan system (1) and be used for being connected with the top of discharging fume the tub, two import (22) have been seted up to the bottom of the cover body (21), the top of the cover body (21) is uncovered and is formed export (23), its characterized in that:

the part of the bottom of the cover body (21) between the two inlets (22) is upwards protruded to form a partition piece (24), and the profile line of the vertical section of the partition piece (24) is a spline curve (L) passing through three vertexes of a triangle.

2. The outlet hood according to claim 1, wherein: the vertex angle alpha of the triangle through which the spline curve (L) passes is less than or equal to 90 degrees.

3. The outlet hood according to claim 1, wherein: the vertical section of the cover body (21) is trapezoid, the base angle of the cover body (21) is beta 1, the included angle between the tangent line at the starting point of the spline curve (L) and the bottom of the cover body (21) is beta 2, and the angle is beta 1-beta 2 < 5 degrees.

4. A hood according to any one of claims 1 to 3, wherein: the spline curve (L) is an arc or conical curve.

5. A hood according to any one of claims 1 to 3, wherein: the height of the partition (24) is lower than that of the cover (21).

6. A range hood comprising a fan system (1), characterized in that: use of an air outlet cover according to any one of claims 1-5, said fan system (1) comprising two fans (11) arranged in parallel, said inlet (22) corresponding to the air outlet of the fans (11).

7. The range hood of claim 6, wherein: the range hood further comprises a fan frame (3), the fan system (1) is arranged in the fan frame (3), and the air outlet cover is arranged on the outer side of the top of the fan frame (3).

Images