CN212202615U - Centrifugal fan and range hood with same - Google Patents

Abstract

The utility model discloses a centrifugal fan, including spiral case and the impeller of setting in the spiral case, the spiral case includes the front shroud, be formed with the air intake on the front shroud, the impeller is including the front ring that is close to the air intake setting, be provided with the air inlet circle on the front shroud, the air inlet circle includes the wind-guiding portion that extends to in the spiral case by the air intake, its characterized in that: the air inlet of the front cover plate is further provided with a sealing ring extending towards the impeller, a flanging is formed on the front cover plate and extends from the periphery of the air inlet to the inner direction of the volute, the front ring is provided with an opening facing the air inlet, the end part of the sealing ring extends into the opening in the front ring, annular cavities are respectively enclosed between the flanging of the volute and the front ring of the impeller, between the front ring of the impeller and the sealing ring, and between the front ring of the impeller and the air guide part of the air inlet ring, and the projection of each cavity in the axial direction of the impeller is provided with a coincidence zone. Also discloses a range hood applying the centrifugal fan.

Description

Centrifugal fan and range hood with same

Technical Field

The utility model relates to a power device, especially a centrifugal fan to and use range hood that has this centrifugal fan.

Background

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

The range hood disclosed in chinese patent application No. 200910252912.7 includes a fan system, the fan system generally includes a motor as a power source, an impeller driven by the motor and used for generating a running air flow, a fan unit for containing the impeller, the fan unit includes a volute casing and an air inlet pipe base connected thereto, the fan unit further includes a seal ring made of an elastic material, a first outer wall and a second outer wall located outside the first outer wall are provided on an air outlet end of the air inlet pipe base, and a seal ring accommodating groove for accommodating the seal ring is formed between the first outer wall and the second outer wall.

The current range hood has gaps in the assembly process due to the accuracy limitation, especially gaps of more than 3mm are formed between the two ends of an impeller and the inner wall of an air duct at the air inlet position of the air duct of a fan system, and pressure leakage is easily formed at the positions due to the fact that positive pressure airflow in the air duct is pressed to the outside through the structural gaps of the fan, and pressure, flow and efficiency loss is caused; in addition, the air inlet ring and the volute in the prior art are usually assembled and fixed through screws, and a plurality of screws are required to be screwed during production and assembly, so that the operation is complex, and the manual manufacturing cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the first technical problem that will solve is not enough to above-mentioned prior art existence, provides a centrifugal fan, avoids the clearance that exists between air intake department impeller tip and the spiral case inner wall to cause the air current to leak.

The utility model aims to solve the second technical problem that a range hood that uses there is above-mentioned centrifugal fan is provided.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: the utility model provides a centrifugal fan, includes the spiral case and sets up the impeller in the spiral case, the spiral case includes the front shroud, be formed with the air intake on the front shroud, the impeller is including the preceding circle that is close to the air intake setting, be provided with the air intake circle on the front shroud, the air intake circle includes the wind-guiding portion that extends to in the spiral case by the air intake, its characterized in that: the air inlet of the front cover plate is further provided with a sealing ring extending towards the impeller, a flanging is formed on the front cover plate and extends from the periphery of the air inlet to the inner direction of the volute, the front ring is provided with an opening facing the air inlet, the end part of the sealing ring extends into the opening in the front ring, annular cavities are respectively enclosed between the flanging of the volute and the front ring of the impeller, between the front ring of the impeller and the sealing ring, and between the front ring of the impeller and the air guide part of the air inlet ring, and the projection of each cavity in the axial direction of the impeller is provided with a coincidence zone.

Preferably, the front ring is U-shaped, the impeller has a central axis, the front ring of the impeller includes an outer side wall, an inner side wall, and a connecting wall connected between the outer side wall and the inner side wall, the connecting wall extends along a radial direction of the impeller, the outer side wall extends toward the air inlet at a radial outer end of the connecting wall, the inner side wall extends toward the air inlet at a radial inner end of the connecting wall, and an end of the sealing ring extends into an opening between the outer side wall and the inner side wall and has a certain gap with the connecting wall; a first cavity is formed between the side wall of the turned edge of the volute and the outer side wall of the front ring of the impeller, a second cavity is formed between the outer side wall of the front ring of the impeller and the sealing ring, a third cavity is formed between the sealing ring and the inner side wall of the front ring of the impeller, and a fourth cavity is formed between the inner side wall of the front ring of the impeller and the air guide part of the air inlet ring.

In order to guide the air flow, the outer side wall is in an arc shape which is bent and protruded toward the central axis of the impeller.

In order to block the air flow and reduce the flow speed, the inner side wall is in an arc shape which is bent and protruded towards the central shaft of the impeller.

Preferably, the distance between the end part of the sealing ring in the front ring and the overlapped part of the end part of the outer side wall close to the air inlet along the axial direction of the impeller is a, and the value range of the a is 2-5 mm.

Preferably, the distance between one end of the outer side wall close to the air inlet and one end of the inner side wall close to the air inlet in the axial direction of the impeller is h, the value range of h is 0-3 mm, and the height of the inner side wall is smaller than that of the outer side wall.

Preferably, the sealing ring is curved from the air inlet to the volute in an arc shape, and the direction of the curved protrusion is towards the central axis of the impeller.

Preferably, sealing washer and air inlet circle integrated into one piece, can dismantle the connection through buckle structure between front shroud and the sealing washer.

In order to facilitate the disassembly and assembly of the sealing ring, a buckle is arranged on the periphery of the outer side of the sealing ring, a clamping groove used for being clamped with the buckle is formed in the periphery of the air inlet of the front cover plate, a buckling groove is formed in the periphery of the outer side of the sealing ring, the buckle is formed by the fact that one end of the buckling groove in the circumferential direction is sunken towards the inner direction of the spiral case, a gap is formed between the buckle and the other end of the buckling groove in the circumferential direction, and the buckle can penetrate through the clamping groove and is fastened on one side.

The utility model provides a technical scheme that above-mentioned second technical problem adopted does: a range hood using the centrifugal fan.

Compared with the prior art, the utility model has the advantages of: by forming the multiple annular cavities at the positions close to the air inlets, part of air flow entering the air duct enters the annular cavities, and the air flow can enter the impeller only by turning or turning for four times or directly escapes from the air inlets of the volute, so that part of air flow returns to the air duct again to reduce and prevent or leak, and the pressure, the flow and the efficiency of the fan are improved.

Drawings

Fig. 1 is a schematic view of a centrifugal fan according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of a centrifugal fan according to an embodiment of the present invention;

fig. 3 is a sectional view of a centrifugal fan according to an embodiment of the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 3;

fig. 5 is a schematic view of a front ring of a centrifugal fan according to an embodiment of the present invention;

fig. 6 is a schematic view of a seal ring of a centrifugal fan according to an embodiment of the present invention;

fig. 7 is an enlarged view of a portion B of fig. 6.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like 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 invention, it is to 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," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the disclosed embodiments of the invention may be oriented in different directions and the directional terms are intended to be illustrative and should not be construed as limiting, such as "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 3, a centrifugal fan is mainly used for a range hood, and can be used in other occasions as needed. Comprising a volute 1, an impeller 2 arranged in the volute 1 and a motor 3 for driving the impeller 2.

The volute 1 comprises a front cover plate 11, a rear cover plate 12 and a circular wall 13 connected between the front cover plate 11 and the rear cover plate 12, wherein an air inlet 111 is formed in the front cover plate 11, a flange 112 is formed on the front cover plate 11 and extends from the periphery of the air inlet 111 to the inner direction of the volute 1, and preferably, the flange 112 extends axially along the impeller 2. The impeller 2 includes a front ring 21, a rear ring 22, and blades 23 disposed between the front ring 21 and the rear ring 22, the front ring 21 is disposed near the air inlet 11, and the blades 23 are circumferentially spaced. The impeller 2 has a central axis X. The motor 3 is fixedly connected with the rear cover plate 12 of the volute 1 through a motor bracket 31. The impeller 2 is sleeved on the output shaft 32 of the motor 3 and is fixedly connected, so that the motor 3 can drive the impeller 2 to rotate.

The centrifugal fan further comprises an air inlet ring 4 and a sealing ring 5 which are arranged at the air inlet 111. The air inlet ring 4 is the same as the prior art, and includes an annular fixing portion 41 fixed at the air inlet 111 on a side facing the outside of the scroll casing 1, and an air guiding portion 42 extending from the air inlet 111 to the inside of the scroll casing 1 from the radially inner side of the fixing portion 41. The seal ring 5 is integrally formed with the air inlet ring 4 and is located between the air inlet ring 4 and the front ring 21 of the impeller 2. The sealing ring 5 is curved from the air inlet 111 to the volute 1 in an arc shape, and the direction of the curve protrusion is towards the central axis X of the impeller 2.

Referring to fig. 4 and 5, the front ring 21 is annular as a whole and includes an outer side wall 211, an inner side wall 212, and a connecting wall 213 connected between the outer side wall 211 and the inner side wall 212, the connecting wall 213 extends along a radial direction of the impeller 2, the outer side wall 211 extends toward the air inlet 111 at a radially outer end of the connecting wall 213, and the inner side wall 212 extends toward the air inlet 111 at a radially inner end of the connecting wall 213, so that the front ring 21 is U-shaped in a cross section in an axial direction of the impeller 2, and an opening of the U-shape faces the air inlet 111. The blades 23 of the impeller 2 are connected and fixed to the connecting wall 213. The end of the seal ring 5 extends between the outer side wall 211 and the inner side wall 212, and has a certain gap with the connecting wall 213, and the distance a along the axial direction of the impeller 2 is a at the overlapping portion of the end of the seal ring 5 in the front ring 21 and the end of the outer side wall 211 close to the air inlet 111, and preferably, the value range of a is 2-5 mm. Preferably, outer wall 211 and inside wall 212 are the crooked outstanding arc of center pin X towards impeller 2, and the radian is preferred to be 0 ~ 45, and outer wall 211 can play the effect of water conservancy diversion to the air current towards one side of inside wall 212 from this, and inside wall 212 can play the effect of hindering to the air current towards one side of outer wall 211.

The outer side wall 211 is close to the one end of air intake 111 and the inner side wall 212 is close to the one end of air intake 111, and the distance in the impeller 2 axial direction is h, namely the difference in height of the outer side wall 211 and the inner side wall 212 in the impeller 2 axial direction, preferably, the range of the value of h is 0-3 mm, and the height of the inner side wall 212 is smaller than that of the outer side wall 211.

Therefore, the impeller 2, the volute 1 and the sealing ring 5 form a plurality of annular cavities. A first cavity Q1 is formed between the side wall of the flange 112 of the volute 1 and the outer side wall 211 of the front ring 21 of the impeller 2, a second cavity Q2 is formed between the outer side wall 211 of the front ring 21 of the impeller 2 and the sealing ring 5, a third cavity Q3 is formed between the sealing ring 5 and the inner side wall 212 of the front ring 21 of the impeller 2, a fourth cavity Q4 is formed between the inner side wall 212 of the front ring 21 of the impeller 2 and the air guide part 42 of the air inlet ring 4, and the projections of the cavities on the central axis X of the impeller 2 all have overlapping areas to form a passage similar to a labyrinth seal.

Therefore, when the range hood is in a working state, airflow enters the impeller 2 from the air inlet 111 of the volute 1, and is accelerated by the impeller 2 and then discharged into the air duct between the volute 1 and the impeller 2, even if part of the airflow entering the air duct can enter the annular cavity, the airflow can enter the impeller 2 only by turning or turning for four times or directly escapes from the air inlet 111 of the volute 1, and therefore, each annular cavity can enable part of the airflow to return to the air duct again to reduce the leakage or prevent the leakage, and the pressure, the flow and the efficiency of the fan are improved. The path of the airflow can be seen in fig. 4 by the arrows.

Referring to fig. 2, 6 and 7, the front cover plate 11 and the sealing ring 5 are integrally connected through a snap structure. The outer periphery of the sealing ring 5 is provided with a buckle 51, the front cover plate 11 is located at the periphery of the air inlet 111 and is provided with at least two clamping grooves 113, and the clamping grooves 113 are arranged at intervals along the circumferential direction. A snap groove 52 is formed in the outer peripheral edge of the seal ring 5, and the snap groove 52 penetrates the seal ring 5 in the axial direction. The catch 51 is formed by one end of the catch groove 52 in the circumferential direction being recessed toward the inside of the scroll casing 1, and a gap is provided between the catch 51 and the other end of the catch groove 52 in the circumferential direction so as to be connected to the front cover plate 11. The bending height of the buckle 51 is slightly larger than the thickness of the slot 113. During installation, the sealing ring 5 is placed outside the volute 1, the buckle 51 is aligned with the clamping groove 113, the buckle 51 penetrates through the clamping groove 113 through the part of the buckle 51 with the clamping groove 52, then the buckle 51 is circumferentially rotated along the air inlet 11, and the buckle 51 is fastened on one side, located on the periphery of the clamping groove 113, of the front cover plate 11 facing the inside of the volute 1. When the disassembly is carried out, the disassembly is carried out by reverse rotation. The connecting mode has the advantages of simple and reliable structure, high assembly efficiency and low labor cost.

Claims (10)

1. The utility model provides a centrifugal fan, includes spiral case (1) and impeller (2) of setting in spiral case (1), spiral case (1) includes front shroud (11), be formed with air intake (111) on front shroud (11), impeller (2) are including being close to preceding circle (21) that air intake (111) set up, be provided with air intake circle (4) on front shroud (11), air intake circle (4) include wind-guiding portion (42) that extend to in spiral case (1) by air intake (111), its characterized in that: the novel spiral casing structure is characterized in that a sealing ring (5) extending towards the impeller (2) is further arranged at the position of an air inlet (111) of the front cover plate (11), a flange (112) extends from the periphery of the air inlet (111) to the inner direction of the spiral casing (1) on the front cover plate (11), the front ring (21) is provided with an opening facing the air inlet (111), the end part of the sealing ring (5) extends into the opening in the front ring (21), annular cavities are respectively enclosed between the flange (112) of the spiral casing (1) and the front ring (21) of the impeller (2), between the front ring (21) of the impeller (2) and the sealing ring (5), and between the front ring (21) of the impeller (2) and an air guide part (42) of the air inlet ring (4), and the projections of the cavities in the axial direction of the impeller (2) have overlapping areas.

2. The centrifugal fan of claim 1, wherein: the impeller (2) is provided with a central shaft (X), the front ring (21) of the impeller (2) comprises an outer side wall (211), an inner side wall (212) and a connecting wall (213) connected between the outer side wall (211) and the inner side wall (212), the connecting wall (213) extends along the radial direction of the impeller (2), the outer side wall (211) extends towards the air inlet (111) at the radial outer end of the connecting wall (213), the inner side wall (212) extends towards the air inlet (111) at the radial inner end of the connecting wall (213), and the end part of the sealing ring (5) extends into an opening between the outer side wall (211) and the inner side wall (212) and has a certain clearance with the connecting wall (213); a first cavity (Q1) is formed between the side wall of a flanging (112) of the volute (1) and the outer side wall (211) of a front ring (21) of the impeller (2), a second cavity (Q2) is formed between the outer side wall (211) of the front ring (21) of the impeller (2) and the sealing ring (5), a third cavity (Q3) is formed between the sealing ring (5) and the inner side wall (212) of the front ring (21) of the impeller (2), and a fourth cavity (Q4) is formed between the inner side wall (212) of the front ring (21) of the impeller (2) and the air guide portion (42) of the air inlet ring (4).

3. The centrifugal fan of claim 2, wherein: the outer side wall (211) is in an arc shape which is bent and protruded towards the central axis (X) of the impeller (2).

4. The centrifugal fan of claim 2, wherein: the inner side wall (212) is in an arc shape which is bent and protruded towards the central axis (X) of the impeller (2).

5. The centrifugal fan according to any one of claims 2 to 4, wherein: the end part of the sealing ring (5) in the front ring (21) and the end part of the outer side wall (211) close to the air inlet (111) are overlapped, the distance along the axial direction of the impeller (2) is a, and the value range of a is 2-5 mm.

6. The centrifugal fan according to any one of claims 2 to 4, wherein: one end of the outer side wall (211) close to the air inlet (111) and one end of the inner side wall (212) close to the air inlet (111) are spaced by h in the axial direction of the impeller (2), the value range of h is 0-3 mm, and the height of the inner side wall (212) is smaller than that of the outer side wall (211).

7. The centrifugal fan according to any one of claims 2 to 4, wherein: the sealing ring (5) is bent into the volute (1) in an arc shape from the air inlet (111), and the protruding direction of the bending is towards the central axis (X) of the impeller (2).

8. The centrifugal fan according to any one of claims 1 to 4, wherein: sealing washer (5) and air intake circle (4) integrated into one piece, can dismantle the connection through buckle structure between front shroud (11) and sealing washer (5).

9. The centrifugal fan of claim 8, wherein: the utility model discloses a volute casing, including the spiral case, the outside periphery of sealing washer (5) is provided with buckle (51), front shroud (11) are located air intake (111) periphery and offer draw-in groove (113) that are used for with buckle (51) block, the outside periphery of sealing washer (5) is formed with catching groove (52), buckle (51) are sunken and form to volute casing (1) inner direction by catching groove (52) ascending one end in week, have the clearance between buckle (51) and catching groove (52) ascending other end in week, buckle (51) can pass draw-in groove (113) and the block fastening is located draw-in groove (113) periphery towards one side in volute casing (1) in front shroud (11).

10. A range hood, its characterized in that: use of a centrifugal fan according to any of claims 1-9.

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