阅读说明：本技术 蜗壳风机及油烟机 (Volute fan and range hood ) 是由 任富佳 刘毅 周海昕 余国成 于 2021-11-04 设计创作，主要内容包括：本发明提供一种蜗壳风机及油烟机,涉及家电设备的技术领域,该蜗壳风机的叶轮的所述前端的外径大于所述后端的外径,且所述前端与所述后端之间设置有多个叶片并形成从后端到前端外径逐渐增大的叶轮；所述蜗壳前板的轮廓大于所述蜗壳后板的轮廓,以使叶轮周围的风道形成从所述蜗壳后板到所述蜗壳前板的外轮廓逐渐增大的风道。本发明提供的蜗壳风机的叶轮形状与叶轮周围的风道均是靠近主进风口一端的面积大,远离主进风口的一端面积小；且叶轮前端和叶轮后端的连接的叶片位于叶轮最上端的时候,从叶片排出的流体朝向出风口从而使流体经过叶轮的排出后,避免了流体的转角,减少了流体的损失。(The invention provides a volute fan and a range hood, and relates to the technical field of household appliances, wherein the outer diameter of the front end of an impeller of the volute fan is larger than that of the rear end, a plurality of blades are arranged between the front end and the rear end, and the impeller with the outer diameter gradually increasing from the rear end to the front end is formed; the contour of the volute front plate is larger than that of the volute rear plate, so that the air channel around the impeller forms an air channel with the contour gradually increasing from the volute rear plate to the volute front plate. The shape of the impeller of the volute fan and the air channels around the impeller are large in area close to one end of the main air inlet, and small in area far away from the end of the main air inlet; and when the blades connected with the front end of the impeller and the rear end of the impeller are positioned at the uppermost end of the impeller, the fluid discharged from the blades faces the air outlet, so that the fluid is discharged through the impeller, the rotating angle of the fluid is avoided, and the loss of the fluid is reduced.)

1. A volute blower comprising a volute and an impeller (400), the volute comprising a volute front plate (100), a volute back plate (200), and a volute shroud plate (300); the volute surrounding plate (300) is arranged between the volute back plate (200) and the volute front plate (100) and forms a chamber, and the volute front plate (100), the volute back plate (200) and the volute surrounding plate (300) form an air outlet (500) communicated with the chamber; a main air inlet (600) communicated with the chamber is formed in the volute front plate (100), and an air channel is formed by the main air inlet (600), the chamber and the air outlet (500); the volute is characterized in that the impeller (400) is arranged at a main air inlet (600) of the volute, and the impeller (400) is provided with a front end (401) close to the front plate (100) of the volute, a rear end (402) close to the rear plate (200) of the volute and a plurality of blades (403);

the outer diameter of the front end (401) is larger than that of the rear end (402), a plurality of blades (403) are arranged between the front end (401) and the rear end (402), and an impeller (400) with the outer diameter gradually increasing from the rear end (402) to the front end (401) is formed;

the profile of the volute front plate (100) is larger than that of the volute rear plate (200), so that the air duct around the impeller (400) is gradually increased from the volute rear plate (200) to the profile of the volute front plate (100), and the gradually increased proportion of the profile is the same as the increased proportion of the outer diameter of the impeller (400).

2. The volute blower of claim 1, wherein the volute shroud (300) is disposed at an acute angle to the volute front plate (100).

3. The volute blower of claim 2, wherein the volute shroud (300) forms an included angle α with the volute front plate (100), and wherein 55 ° < α < 90 °.

4. The volute blower of claim 1, wherein the volute bulkhead (300) has a progressively larger profile in cross-section from the volute back plate (200) to the volute front plate (100).

5. The volute blower of claim 1, wherein the volute enclosure (300) comprises a first enclosure (301) having a planar surface and a second enclosure (302) having an arcuate surface, wherein the first enclosure (301) has one end connected to the outlet opening (500) and the other end connected to the second enclosure (302), and wherein the planar surface of the first enclosure (301) is tangent to the arcuate surface of the second enclosure (302) at the junction.

6. The volute blower of claim 5, wherein the volute enclosure (300) further comprises a third enclosure (303) extending from the volute tongue to the outlet (500), the third enclosure (303) being connected to the second enclosure (302) and the connection being rounded to form the volute tongue;

the third enclosing plate (303) is an arc-shaped surface positioned in the volute fan, an included angle x is formed between a connecting line of the arc-shaped surface and the first enclosing plate (301) along two ends of the air channel, and x is more than 5 degrees and less than 20 degrees.

7. The volute blower of claim 6, wherein the arcuate face of the third shroud (303) has a camber to chord ratio of between 1/20-1/5.

8. The volute blower of claim 7, wherein the volute back plate (200) comprises a volute back main plate (201) and a volute back guide plate (202), the volute back guide plate (202) being disposed at an obtuse angle to the volute back main plate (201), the volute back main plate (201) being configured to direct the airflow to the air outlet (500).

9. The volute blower of claim 8, wherein the volute rear guide plate (202) forms an angle y with the volute rear main plate (201), and wherein 150 ° < y < 175 °.

10. A range hood, characterized by comprising a volute fan according to any one of claims 1-9.

Technical Field

The invention relates to the technical field of household appliances, in particular to a volute fan and a range hood.

Background

The fan of the side-draught fan is fixed in an inclined mode, a certain included angle exists between the flow direction of fluid at the outlet of the impeller and the flow direction of an air outlet of the volute, so that the fluid inside the fan can be discharged only by changing a certain direction in the fan, the loss of fluid discharge amount is caused, and the air volume of the fan is reduced.

Disclosure of Invention

The invention aims to provide a volute fan and a range hood so as to relieve the technical problems of fluid discharge loss and air volume reduction of the existing fan which is obliquely fixed.

The invention provides a volute fan which comprises a volute and an impeller, wherein the volute comprises a volute front plate, a volute rear plate and a volute coaming plate; the volute enclosing plate is arranged between the volute rear plate and the volute front plate and forms a cavity, and the volute front plate, the volute rear plate and the volute enclosing plate form an air outlet communicated with the cavity; a main air inlet communicated with the chamber is formed in the front plate of the volute, and an air duct is formed by the main air inlet, the chamber and the air outlet; the impeller is arranged at a main air inlet of the volute and is provided with a front end close to the front plate of the volute, a rear end close to the rear plate of the volute and a plurality of blades;

the outer diameter of the front end is larger than that of the rear end, a plurality of blades are arranged between the front end and the rear end, and an impeller with the outer diameter gradually increasing from the rear end to the front end is formed;

the contour of the volute front plate is larger than that of the volute rear plate, so that the air duct around the impeller is gradually increased from the volute rear plate to the contour of the volute front plate, and the gradually-increased proportion of the contour is the same as the increased proportion of the outer diameter of the impeller.

Further, the volute enclosure plate is disposed at an acute angle to the volute front plate.

Further, the volute enclosing plate and the volute front plate form an included angle alpha, and the included angle alpha is more than 55 degrees and less than 90 degrees.

Further, the volute enclosing plate has a gradually larger profile in cross section from the volute back plate to the volute front plate.

Furthermore, the volute enclosing plate comprises a first enclosing plate with a plane and a second enclosing plate with an arc surface, one end of the first enclosing plate is connected with the air outlet, the other end of the first enclosing plate is connected with the second enclosing plate, and the plane of the first enclosing plate is tangent to the arc surface of the second enclosing plate at the connection position.

Furthermore, the volute enclosing plate also comprises a third enclosing plate extending from the volute tongue to the air outlet, the third enclosing plate is connected with the second enclosing plate, and the arc transition at the connection part forms the volute tongue;

the third enclosing plate is an arc-shaped surface which is positioned in the volute fan, and the connecting line of the arc-shaped surface along the two ends of the air channel and the first enclosing plate form an included angle x, and x is more than 5 degrees and less than 20 degrees.

Further, the ratio of the arc height to the chord length of the arc-shaped surface of the third enclosing plate is 1/20-1/5.

Furthermore, the volute rear plate comprises a volute rear main plate and a volute rear guide plate, the volute rear guide plate and the volute rear main plate form an obtuse angle, and the volute rear main plate is used for guiding airflow to the air outlet.

Furthermore, the volute rear guide plate and the volute rear main plate form an included angle y, and y is more than 150 degrees and less than 175 degrees.

The invention further provides a range hood which comprises the volute fan.

The shape of the impeller of the volute fan and the air channels around the impeller are large in area close to one end of the main air inlet, and small in area far away from the end of the main air inlet; when the blades connected with the front end of the impeller and the rear end of the impeller are positioned at the uppermost end of the impeller, the fluid discharged from the blades faces the air outlet, so that the fluid is directly towards the air outlet after being discharged by the impeller; the vanes at other places enable the fluid to directly face the air outlet after entering the air duct and be discharged from the air outlet, thereby avoiding the turning angle of the fluid, reducing the loss of the fluid, namely avoiding the reduction of the air volume of the volute fan, and the outer diameter of the impeller from the rear end to the front end is gradually increased, so that the main air inlet is enlarged, and the air inlet volume is increased.

The invention also provides a range hood, which adopts the volute fan, so that all beneficial effects of the volute fan are achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a range hood in the prior art;

FIG. 2 is a schematic structural view of the range hood shown in FIG. 1 from another angle;

fig. 3 is a schematic structural diagram of a volute blower provided in an embodiment of the present invention;

FIG. 4 is a schematic view of another angle of the volute blower of FIG. 3;

FIG. 5 is a schematic view of yet another angle of the volute blower of FIG. 3;

FIG. 6 is a schematic view of yet another angle of the volute blower of FIG. 3;

fig. 7 is a schematic structural view of an impeller of the volute blower shown in fig. 3.

Icon: 100-volute front plate; 200-volute back plate; 201-volute rear main board; 202-volute rear guide plate; 300-volute enclosure plate; 301-a first shroud; 302-a second shroud; 303-a third enclosing plate; 400-an impeller; 401-front end; 402-back end; 403-blade; 500-air outlet; 600-a main air inlet; 700-volute connection plate; 800-vortex.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 3 to 7, the present invention provides a volute blower, which includes a volute and an impeller 400, wherein the volute includes a volute front plate 100, a volute rear plate 200 and a volute enclosing plate 300; the volute surrounding plate 300 is arranged between the volute back plate 200 and the volute front plate 100 and forms a chamber, and the volute front plate 100, the volute back plate 200 and the volute surrounding plate 300 form an air outlet 500 communicated with the chamber; a main air inlet 600 communicated with the chamber is arranged on the volute front plate 100, and the main air inlet 600, the chamber and the air outlet 500 form an air duct; the impeller 400 is arranged at the main air inlet 600 of the volute, and the impeller 400 is provided with a front end 401 close to the front plate 100 of the volute, a rear end 402 close to the rear plate 200 of the volute and a plurality of blades 403;

the outer diameter of the front end 401 is larger than that of the rear end 402, and a plurality of blades 403 are arranged between the front end 401 and the rear end 402 to form an impeller 400 with the outer diameter gradually increasing from the rear end 402 to the front end 401;

the contour of the volute front plate 100 is larger than that of the volute back plate 200, so that the air duct around the impeller 400 is gradually increased from the volute back plate 200 to the outer contour of the volute front plate 100, and the gradually increased proportion of the outer contour is the same as the increased proportion of the outer diameter of the impeller 400.

In some embodiments, the volute front plate 100, the volute shroud plate 300 and the volute back plate 200 are welded to form a volute, the primary air inlet 600 is disposed on the volute front plate 100, the blower is disposed on the volute back plate 200, air enters the chamber from the primary air inlet 600 and flows out from the air outlet 500, and an air duct is formed between the primary air inlet 600 and the air outlet 500.

Since the front end 401 of the impeller 400 facing the main air inlet 600 is larger than the rear end 402 of the volute back plate 200, the blades 403 are arranged between the front end 401 and the rear end 402, the outermost sides of the blades 403, the outermost sides of the front end 401 and the outermost sides of the rear end 402 are in a straight line, and the impeller 400 has a truncated cone shape when the impeller 400 rotates.

The air duct formed between the impeller 400 and the volute shroud plate 300 is also gradually changed from the volute back plate 200 to the outer contour of the volute, and the gradual change proportion of the air duct is the same as the gradual change proportion of the outer diameter of the impeller 400; the fluid passing through the impeller 400 can be discharged perpendicular to the uppermost blades 403 of the impeller 400, and the fluid does not pass through the turning path, so that the discharge is smoother and more efficient. And the volute back plate 200 designed in this way is smaller in size, so that the manufacturing cost can be reduced.

The fluid entering the volute fan enters the air channel after being discharged by the impeller 400, and can directly flow to the air outlet 500 after passing through the air channel without a turning path, so that fluid loss is avoided, the air volume of the volute fan is reduced, and the air volume of the fan is prevented from being influenced by vortex 800 loss.

As shown in fig. 1 and 2, in the prior art, the side hood is fixedly arranged at an inclination angle of 25 to 30 degrees, so that gas exhausted from the impeller 400 needs to pass through a rotation angle of 25 to 30 degrees and then is exhausted from an air outlet 500 of the fan, as shown in fig. 2, the gas flow is easy to generate a vortex 800, so that the gas flow loss is caused, and the air volume of the fan is reduced.

As shown in fig. 3, based on the above embodiment, further, the volute bulkhead 300 is disposed at an acute angle with respect to the volute front plate 100; the volute coaming plate 300 and the volute front plate 100 form an included angle alpha, and alpha is more than 55 degrees and less than 90 degrees.

When the included angle alpha is smaller than 55 degrees, turbulent flow is generated in the volute fan, so that large loss of air volume is caused; when alpha is equal to 90 deg., the fan is of the existing design, i.e. the volute front plate 100 and the volute back plate 200 are of the same size design. At this time, a large included angle exists between the fluid and the air outlet 500 of the volute fan, so that the fluid loss is large, and the performance of the fan is affected.

Further, the volute bulkhead 300 has a gradually increasing profile in cross section from the volute back plate 200 to the volute front plate 100.

The volute enclosure 300 forms the air duct with an outer contour gradually increasing from the volute back plate 200 to the volute front plate 100, and the volute enclosure 300 also has the same trend of variation.

As shown in fig. 6, based on the above embodiment, further, the volute enclosing plate 300 includes a first enclosing plate 301 having a flat surface and a second enclosing plate 302 having an arc surface, one end of the first enclosing plate 301 is connected to the air outlet 500, the other end is connected to the second enclosing plate 302, and the flat surface of the first enclosing plate 301 is tangent to the arc surface of the second enclosing plate 302 at the connection point.

In some embodiments, the first enclosing plate 301 of the volute enclosing plate 300 is provided with a plane, the plane is tangentially connected with the cambered surface of the second enclosing plate 302, when the airflow flows along the second enclosing plate 302, the second enclosing plate 302 guides the airflow to flow to the air outlet 500, the airflow guided by the second enclosing plate 302 can directly flow to the air outlet 500 along the first enclosing plate 301, the flow direction of the airflow is not changed by the first enclosing plate 301, and therefore the vortex 800 loss caused by the turning in the prior art is eliminated, and the air volume is increased.

Based on the above embodiment, further, the volute enclosing plate 300 further includes a third enclosing plate 303 extending from the volute tongue to the air outlet 500, the third enclosing plate 303 is connected to the second enclosing plate 302, and the arc transition at the connection point forms the volute tongue;

the third enclosing plate 303 is an arc-shaped surface positioned in the volute fan, an included angle x is formed between a connecting line of the arc-shaped surface and the first enclosing plate 301 along two ends of the air channel, and x is more than 5 degrees and less than 20 degrees.

When the included angle x is less than 5 degrees, the air outlet 500 is not smooth in flow, the air quantity is reduced, and when the included angle x is more than 20 degrees, the vortex 800 appears at the air outlet 500, and the air quantity is lost.

Further, the ratio of the arc height to the chord length of the arc-shaped surface of the third surrounding plate 303 is 1/20-1/5.

When the ratio is more than 1/5, the diffuser section is easy to generate vortex 800 turbulence, reducing the air quantity, and when the ratio is less than 1/20, the fluid separation is easy to generate. The flow field of the volute tongue and the diffusion section is improved, so that the air flow loss is reduced, and the air quantity is increased.

As shown in fig. 5, based on the above embodiment, further, the volute back plate 200 includes a volute back main plate 201 and a volute back guide plate 202, the volute back guide plate 202 and the volute back main plate 201 form an obtuse angle, and the volute back main plate 201 is used for guiding the airflow to the air outlet 500.

Further, the volute rear guide plate 202 forms an included angle y with the volute rear main plate 201, and y is more than 150 degrees and less than 175 degrees.

When y is larger than 175 degrees, the flow speed of the air outlet 500 is not obviously reduced, the noise is not obviously reduced, and when y is smaller than 150 degrees, the vortex 800 appears at the air outlet 500, and the air volume is lost.

The impeller 400 shape and the volute containing cavity of the volute fan provided by the invention have large areas close to one end of the main air inlet 600 and small areas far away from one end of the main air inlet 600, so that after fluid is discharged through the impeller 400, the fluid discharged from the impeller 400 directly faces the air outlet 500 after passing through the air duct and is discharged from the air outlet 500, the turning angle of the fluid is avoided, the loss of the fluid is reduced, namely, the reduction of the air volume of the volute fan is avoided, the outer diameter of the impeller 400 is gradually increased from the rear end 402 to the front end 401, the main air inlet 600 is enlarged relative to the whole volute, and the air inlet volume is increased.

The profile of the front volute plate 100 is larger than that of the rear volute plate 200, the volute of the volute fan is provided with a main air inlet 600 and a secondary air inlet, the main air inlet 600 is arranged on the front volute plate 100, the secondary air inlet is arranged on the rear worm wheel plate volute, the main air inlet 600 faces the stove, the air inlet amount of the main air inlet 600 is increased, the air inlet amount of the secondary air inlet is reduced, and the oil smoke extraction effect is improved.

The invention further provides a range hood which comprises the volute fan.

The volute fan is provided with a volute connecting plate 700, the volute connecting plate 700 is used for connecting the shell of the range hood, and the auxiliary volute fan is fixedly connected with the shell of the range hood.

The invention also provides a range hood, which adopts the volute fan, so that all beneficial effects of the volute fan are achieved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.