Volute, fan assembly and extractor hood

Abstract

The present application relates to the technical field of life electric appliances, and provides a volute, a fan assembly and a range hood. The volute comprises a baffle plate formed with a volute tongue; a bottom plate arranged below the baffle plate to form an air duct together with the baffle plate; the bottom plate is formed with a volute air inlet located upstream of the volute tongue and a step surface located downstream of the volute tongue; the step surface is inclined upward along the air outlet direction of the air duct, so that the plate surface of the bottom plate located downstream of the step surface is protruded relative to the plate surface located upstream of the step surface. According to the present application, the step surface is arranged on the bottom plate, so that the plate surface of the bottom plate located downstream of the step surface is protruded relative to the plate surface located upstream of the step surface, and then a thicker fan can be installed in the thicker space of the air duct located upstream of the step surface, so as to ensure the air volume and reduce the noise, and meanwhile the existence of the step surface can also improve the noise, air speed and other performances of the space of the air duct located downstream of the step surface.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a volute, a fan assembly and a range hood. BACKGROUND

[0002] The range hood has become one of the essential household appliances in a family. When the range hood is running, the fan inside the range hood forms a negative pressure zone in a certain space above the stove through high-speed rotation, and then the oil fume gas in the room is sucked into the range hood and separated.

[0003] With people paying more and more attention to space utilization, thin range hoods have emerged as the times require. The thin range hood occupies small cabinet space, is beautiful and simple, but because the overall thickness of the volute of the thin range hood is uniform and the thickness is very thin, the fan accommodated is very thin, which affects the performance of the whole machine. SUMMARY

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a volute to solve the technical problem that the thickness of the existing volute is thin and affects the performance of the whole machine.

[0005] According to the volute of the first aspect of the present application, comprising:

[0006] The surrounding plate is formed with a volute tongue;

[0007] The bottom plate is arranged below the surrounding plate to form an air duct together with the surrounding plate; the bottom plate is formed with a volute inlet located upstream of the volute tongue and a step surface located downstream of the volute tongue; the step surface is inclined upward along the air outlet direction of the air duct, so that the plate surface of the bottom plate located downstream of the step surface is protruded relative to the plate surface located upstream of the step surface.

[0008] According to the volute of the present application, by arranging the step surface on the bottom plate, the plate surface of the bottom plate located downstream of the step surface is protruded relative to the plate surface located upstream of the step surface, so that a thicker fan can be installed in the thicker space located upstream of the step surface of the air duct, to ensure the air volume and reduce the noise, and the existence of the step surface can also improve the performance such as noise and air speed in the space located downstream of the step surface of the air duct.

[0009] According to one embodiment of the present application, the surrounding plate is formed with an outer air outlet located downstream of the volute tongue, and the air duct comprises an outer air duct located between the volute inlet and the outer air outlet.

[0010] According to one embodiment of the present application, the step surface comprises a first step surface arranged adjacent to the volute tongue, the first step surface being located between the volute tongue and the outer exhaust air outlet; the first step surface is inclined upward along the air outlet direction of the outer exhaust air duct, so that the surface of the bottom plate located between the first step surface and the outer exhaust air outlet is convex relative to the surface of the bottom plate located upstream of the first step surface.

[0011] According to one embodiment of the present application, the inclination angle of the first step surface relative to the horizontal plane is not greater than 45°.

[0012] According to one embodiment of the present application, the air duct further comprises an inner circulating air duct, a first end of the inner circulating air duct being in communication with the outer exhaust air duct, a second end of the inner circulating air duct extending in a direction opposite to the air outlet direction of the outer exhaust air outlet; the first end of the inner circulating air duct is provided with a valve piece, the valve piece being switched between an open position for communicating the inner circulating air duct and the outer exhaust air duct and a closed position for isolating the inner circulating air duct and the outer exhaust air duct.

[0013] According to one embodiment of the present application, the step surface comprises a second step surface arranged adjacent to the valve piece, the second step surface being located on the side of the valve piece facing the outer exhaust air duct; the second step surface is inclined upward along the air outlet direction of the inner circulating air duct, so that the surface of the bottom plate located downstream of the second step surface is convex relative to the surface of the bottom plate located between the second step surface and the outer exhaust air outlet.

[0014] According to one embodiment of the present application, the inclination angle of the second step surface relative to the horizontal plane is 30°-60°.

[0015] According to one embodiment of the present application, the step surface comprises a third step surface, the third step surface being located on the side of the valve piece facing away from the outer exhaust air duct; the third step surface is inclined upward along the air outlet direction of the inner circulating air duct, so that the surface of the bottom plate located downstream of the third step surface is convex relative to the surface of the bottom plate located upstream of the third step surface.

[0016] According to one embodiment of the present application, the inclination angle of the third step surface relative to the horizontal plane is not greater than 45°.

[0017] According to one embodiment of the present application, the surface of the bottom plate located at the second end of the inner circulating air duct is inclined upward along the air outlet direction of the inner circulating air duct.

[0018] According to one embodiment of the present application, the surrounding plate comprises a first surrounding plate and a second surrounding plate, a first end of the first surrounding plate and a first end of the second surrounding plate are spaced apart to form the outer exhaust air outlet, a second end of the first surrounding plate is bent towards the outer exhaust air outlet to semi-enclose the volute air inlet, the volute tongue is formed at the second end of the first surrounding plate, and a second end of the second surrounding plate is bent towards the first surrounding plate and extends to the outer wall of the second surrounding plate, and the valve plate is pivotally arranged between the second end of the first surrounding plate and the second surrounding plate.

[0019] According to one embodiment of the present application, the profile line of the first surrounding plate comprises an Archimedes spiral.

[0020] According to one embodiment of the present application, the corner of the second end of the second surrounding plate is rounded.

[0021] According to one embodiment of the present application, the fan assembly comprises a fan and the volute described above, and the fan is installed at the volute air inlet.

[0022] According to one embodiment of the present application, the range hood comprises a housing and the fan assembly described above, the volute is arranged in the housing, the housing is formed with a housing air inlet corresponding to the volute air inlet and a volute air outlet communicated with the air duct.

[0023] According to one embodiment of the present application, in the case that the air duct comprises an outer exhaust air duct and an inner circulation air duct, the volute is arranged on the top surface of the housing, the volute air outlet comprises an inner circulation air outlet and openable and closable upper and rear air outlets, the upper air outlet is formed at the rear end of the top surface of the housing and is communicated with the outer exhaust air duct, the rear air outlet is formed at the rear side wall of the housing and is arranged corresponding to the outer exhaust air outlet, and the inner circulation air outlet is formed at the front end of the top surface of the housing and is communicated with the second end of the inner circulation air duct.

[0024] The one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0025] The volute of the present application can install a thicker fan in the thicker space upstream of the step surface by arranging the step surface on the bottom plate, so as to ensure the air volume and reduce the noise, and the step surface can also improve the noise, air speed and other performances in the space downstream of the step surface.

[0026] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and the attendant drawings or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

[0028] Figure 1 is a top view of the volute provided by the embodiment of the present application;

[0029] Figure 2 is one of the three-dimensional schematic views of the volute provided by the embodiment of the present application;

[0030] Figure 3 is the second three-dimensional schematic view of the volute provided by the embodiment of the present application;

[0031] Figure 4 is the third three-dimensional schematic view of the volute provided by the embodiment of the present application;

[0032] Figure 5 is a top view of the fan assembly under the internal circulation air outlet mode provided by the embodiment of the present application;

[0033] Figure 6 is a top view of the fan assembly under the upper air outlet mode or the rear air outlet mode provided by the embodiment of the present application;

[0034] Figure 7 is a three-dimensional schematic view of the extractor hood provided by the embodiment of the present application;

[0035] Figure 8 is a longitudinal sectional view of the extractor hood provided by the embodiment of the present application;

[0036] Figure 9 is a bottom view of the extractor hood (without bottom cover plate) provided by the embodiment of the present application;

[0037] Figure 10 is a longitudinal sectional view of the extractor hood (without fan) provided by the embodiment of the present application.

[0038] Reference signs:

[0039] 100, surrounding plate; 101, outer air outlet; 110, first surrounding plate; 111, volute tongue;

[0040] 120, second surrounding plate; 200, bottom plate; 201, first step surface; 202, second step surface;

[0041] 203, third step surface; 204, volute inlet; 210, first panel; 220, second panel;

[0042] 230, fourth panel; 240, sixth panel; 250, seventh panel; 300, valve piece; 400, air duct;

[0043] 401, outer exhaust air duct; 402, inner circulating air duct; 510, motor; 520, impeller; 600, casing;

[0044] 601, upper air outlet; 602, rear air outlet; 603, inner circulating air outlet; 610, rear side plate;

[0045] 620, left side plate; 630, top cover plate; 631, front cover plate; 632, rear cover plate. DETAILED DESCRIPTION

[0046] The embodiments of the present application will be further described below in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0047] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "above", "over" and "on top of" the second feature, which can mean that the first feature is directly above or obliquely above the second feature, or only means that the horizontal thickness of the first feature is higher than that of the second feature. The first feature is "below", "under" and "underneath" the second feature, which can mean that the first feature is directly below or obliquely below the second feature, or only means that the horizontal thickness of the first feature is smaller than that of the second feature.

[0050] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0051] In combination Figures 1 to 6 As shown, the embodiment of the present application provides a volute, which comprises a surrounding plate 100 and a bottom plate 200; the bottom plate 200 is arranged below the surrounding plate 100 to form an air duct 400 together with the surrounding plate 100; the surrounding plate 100 is formed with a volute tongue 111, the bottom plate 200 is formed with a volute inlet 204 and a stepped surface, the volute inlet 204 is located upstream of the volute tongue 111, and the stepped surface is located downstream of the volute tongue 111; the stepped surface is inclined upward along the air outlet direction of the air duct 400, so that the plate surface of the bottom plate 200 downstream of the stepped surface is protruded relative to the plate surface of the bottom plate 200 upstream of the stepped surface, that is, taking the stepped surface as the boundary, the thickness of the space of the air duct 400 upstream and downstream of the stepped surface is different, and the thickness of the space of the air duct 400 downstream of the stepped surface is smaller than that of the space upstream of the stepped surface. It should be noted that "upstream of the volute tongue 111" and "downstream of the volute tongue 111" in the above description are based on the flow direction of the airflow in the air duct 400, that is, along the flow direction of the airflow in the air duct 400, the bottom plate 200 is sequentially formed with the volute inlet 204 and the stepped surface, and the volute tongue 111 is located between the volute inlet 204 and the stepped surface. The "thickness" in the above description generally refers to the dimension perpendicular to the extension direction of the air duct 400, that is, taking the orientation shown in the figure as the reference, the thickness of the air duct 400 refers to the dimension in the up-down direction of the air duct 400. Figure 2 The "thickness" in the above description generally refers to the dimension perpendicular to the extension direction of the air duct 400, that is, taking the orientation shown in the figure as the reference, the thickness of the air duct 400 refers to the dimension in the up-down direction of the air duct 400.

[0052] Taking the application of the volute to the range hood as an example, the external airflow is sucked into the volute from the volute inlet 204 and can be discharged from different positions of the volute according to different exhaust modes of the range hood. The step surface has multiple setting positions for different exhaust modes:

[0053] Mode one, rear air outlet mode, that is, the oil fume sucked into the range hood is discharged to the outside of the room through the smoke pipe from the rear end of the range hood after treatment. For this mode, as shown in Figure 3 , the coaming 100 is formed with an external air outlet 101 located downstream of the volute tongue 111, and the air duct 400 includes an external air outlet duct 401 located between the volute inlet 204 and the external air outlet 101. The fan is installed at the volute inlet 204, and the indoor oil fume is sucked into the volute from the volute inlet 204, flows along the external air outlet duct 401, and is finally discharged from the external air outlet 101. The oil fume discharged from the external air outlet 101 is discharged to the outside of the room through the smoke pipe.

[0054] As shown in Figures 1 to 4 , the step surface includes a first step surface 201 located between the volute tongue 111 and the external air outlet 101, that is, the first step surface 201 is located on the side of the volute tongue 111 away from the volute inlet 204, and the first step surface 201 is arranged close to the volute tongue 111; the first step surface 201 is inclined upward along the air outlet direction of the external air outlet duct 401, so that the second panel 220 is protruded relative to the first panel 210. As shown in Figure 1As shown, the first panel 210 refers to the panel of the bottom plate 200 upstream of the first step surface 201, and the second panel 220 refers to the panel of the bottom plate 200 between the first step surface 201 and the outer exhaust air outlet 101. The inclination angle of the first step surface 201 relative to the horizontal plane is not greater than 45°, and further, the inclination angle of the first step surface 201 relative to the horizontal plane is not greater than 30°. The advantage of arranging the first step surface 201 downstream of the volute tongue 111 is that: on the one hand, since the first step surface 201 is located downstream of the volute tongue 111, the presence of the first step surface 201 will not affect the airflow in the core area of the volute, i.e., the area upstream of the volute tongue 111; on the other hand, since the flow area of the outer exhaust air duct 401 is smallest at the volute tongue 111, the airflow will expand after passing through the volute tongue 111. Compared with the case where the second panel 220 is flush with the first panel 210, the protrusion of the second panel 220 relative to the first panel 210 can reduce the flow area of the outer exhaust air duct 401 downstream of the volute tongue 111, so as to ensure that the airflow continues to expand after passing through the volute tongue 111, and to slow down the expansion rate; on the other hand, since the second panel 220 is protruded relative to the first panel 210, the thickness of the space of the outer exhaust air duct 401 upstream of the volute tongue 111 is greater than the thickness of the space of the outer exhaust air duct 401 downstream of the volute tongue 111, that is, the outer exhaust air duct 401 includes a thinner downstream space and a thicker upstream space, and the thinner downstream space can meet the installation requirements of the whole volute, and the thicker upstream space can meet the installation requirements of the thicker fan, so as to ensure the air volume and reduce the noise; on the other hand, since the first step surface 201 is inclined upward along the air outlet direction of the outer exhaust air duct 401, the presence of the first step surface 201 will not hinder the airflow in the outer exhaust air duct 401.

[0055] Mode two, the upper air outlet mode, that is, the oil fume sucked into the range hood is discharged to the outdoor through the smoke pipe from the upper rear of the range hood after treatment. For this mode, as shown in Figure 1 The air duct 400 further includes an inner circulation air duct 402, the first end of the inner circulation air duct 402 is in communication with the outer exhaust air duct 401, and the second end of the inner circulation air duct 402 extends in a direction opposite to the air outlet direction of the outer exhaust air outlet 101; the first end of the inner circulation air duct 402 is provided with a valve piece 300, and the valve piece 300 is switched between an open position for communicating the inner circulation air duct 402 and the outer exhaust air duct 401 and a closed position for separating the inner circulation air duct 402 and the outer exhaust air duct 401. As shown in Figure 7 and Figure 8As shown, the volute is located inside the housing 600 of the range hood and is fastened to the top surface of the housing 600. The exhaust port 101 of the volute is aligned with the rear exhaust port 602 of the housing 600, and the upper exhaust port 601 of the housing 600 is located directly above the exhaust duct 401. If the upper exhaust method is selected when installing the range hood, the valve plate 300 is switched to the closed position to isolate the internal circulation duct 402 and the exhaust duct 401. At the same time, the exhaust port 101 or the rear exhaust port 602 of the range hood is covered by a sealing cover. Indoor fumes are drawn into the volute through the air inlet 204 and flow along the exhaust duct 401. Because the internal circulation duct 402 is blocked by the valve plate 300, and the external exhaust vent 101 or the rear exhaust vent 602 is also covered, the airflow blows to the rear side plate 610 of the casing 600 and then turns back. The airflow in the external exhaust duct 401 can only be discharged through the upper exhaust vent 601.

[0056] like Figure 1 , Figure 2 and Figure 4 As shown, the stepped surface includes a second stepped surface 202 adjacent to the valve plate 300, located on the side of the valve plate 300 facing the exhaust duct 401. The second stepped surface 202 is inclined upward along the air outlet direction of the internal circulation duct 402, so that the fourth panel 230 protrudes relative to the third panel. The third panel refers to the panel surface of the base plate 200 located between the second stepped surface 202 and the exhaust vent 101; the fourth panel 230 refers to the panel surface of the base plate 200 located downstream of the second stepped surface 202. When the base plate 200 also has a first stepped surface 201, the third panel and the second panel 220 can be the same panel. The inclination angle of the second stepped surface 202 relative to the horizontal plane is 30° to 60°, for example, 45°. In this embodiment, the second stepped surface 202 is positioned on the side of the valve plate 300 facing the exhaust duct 401, i.e., upstream of the valve plate 300. This is because when the range hood uses an upward exhaust method, the exhaust vent 101 or the rear exhaust vent 602 is covered. The airflow hits the rear wall of the casing 600 and then turns back, with some of the turned-back airflow impacting the valve plate 300. The presence of the second stepped surface 202 allows the airflow towards the valve plate 300 to flow obliquely upward under the guidance of the second stepped surface 202, thereby reducing the airflow blowing onto the valve plate 300, reducing the impact on the valve plate 300, extending the valve plate 300's lifespan, and also reducing noise and airflow kinetic energy loss. Furthermore, since the second stepped surface 202 is inclined upward along the exhaust direction of the internal circulation duct 402, for the internal circulation method, the presence of the second stepped surface 202 will not affect the airflow entering the internal circulation duct 402.

[0057] The third mode is an internal circulation air outlet mode, i.e., the oil fume sucked by the range hood is discharged into the room from the front upper part of the range hood after treatment. For this mode, as shown in Figure 1 The air duct 400 further includes an internal circulation air duct 402, a first end of the internal circulation air duct 402 being in communication with the external air outlet duct 401, and a second end of the internal circulation air duct 402 extending in a direction opposite to the air outlet direction of the external air outlet 101. The first end of the internal circulation air duct 402 is provided with the valve plate 300. As shown in Figure 7 and Figure 8 The volute is arranged in the casing 600 of the range hood and is buckled to the top surface of the casing 600, the external air outlet 101 of the volute being aligned with the rear air outlet 602 of the casing 600, the upper air outlet 601 of the casing 600 being located directly above the external air outlet duct 401, and the internal circulation air outlet 603 of the casing 600 being located directly above the internal circulation air duct 402. If the internal circulation air outlet mode is selected when the range hood is installed, the valve plate 300 is switched to the open position to communicate the internal circulation air duct 402 and the external air outlet duct 401. At the same time, the external air outlet 101 or the rear air outlet 602 and the upper air outlet 601 of the range hood are covered with a sealing cover plate. The indoor oil fume is sucked into the volute from the air inlet 204 of the volute and flows along the external air outlet duct 401. Since the external air outlet 101 or the rear air outlet 602 and the upper air outlet 601 are covered, and the internal circulation air duct 402 is in communication with the external air outlet duct 401, the airflow that blows to the rear wall of the casing 600 and then folds back will flow into the internal circulation air duct 402, and the airflow entering the internal circulation air duct 402 will finally be discharged into the room from the internal circulation air outlet 603.

[0058] As shown in Figure 2 and Figure 4 The stepped surface includes a third stepped surface 203 located on the side of the valve plate 300 away from the external air outlet duct 401. The third stepped surface 203 is inclined upward along the air outlet direction of the internal circulation air duct 402, so that the sixth panel 240 is raised relative to the fifth panel. The fifth panel refers to the panel of the bottom plate 200 located upstream of the third stepped surface 203, and the sixth panel 240 refers to the panel of the bottom plate 200 located downstream of the third stepped surface 203. When the bottom plate 200 further forms a second stepped surface 202, the fifth panel and the fourth panel 230 are the same panel. Further, the inclination angle of the third stepped surface 203 relative to the horizontal plane is not greater than 45°, for example, the inclination angle of the third stepped surface 203 relative to the horizontal plane is not greater than 30°. The length of the third stepped surface 203 along the air outlet direction of the internal circulation air duct 402 satisfies that the main flow direction of the airflow passing through the third stepped surface 203 is toward the center of the internal circulation air outlet 603. The third stepped surface 203 is arranged downstream of the valve plate 300 in this embodiment, which has the following advantages: on the one hand, since the third stepped surface 203 is inclined upward along the air outlet direction of the internal circulation air duct 402, as shown in Figure 10As shown by the middle arrow, when the airflow in the internal circulation duct 402 flows through the third step surface 203, it flows obliquely upward under the guidance of the third step surface 203. This not only makes the main direction of the airflow face the internal circulation outlet 603, but also reduces the impact of the airflow on the housing 600 near the internal circulation outlet 603. On the other hand, compared with the case where the sixth panel 240 is flush with the fifth panel, the sixth panel 240 protrudes relative to the fifth panel, which makes the space thickness of the internal circulation duct 402 downstream of the third step surface 203 less than the space thickness upstream of the third step surface 203, thus facilitating the assembly of the volute in the housing 600.

[0059] As can be seen from the above, in this embodiment, the volute is provided with a stepped surface on the bottom plate 200, so that the plate surface of the bottom plate 200 located downstream of the stepped surface protrudes relative to the plate surface located upstream of the stepped surface. This allows for the use of the thicker space of the air duct 400 located upstream of the stepped surface to install a thicker fan, ensuring air volume and reducing noise. At the same time, the presence of the stepped surface can also improve the noise, wind speed and other performance of the air duct 400 located downstream of the stepped surface.

[0060] like Figure 6 As shown, the bottom plate 200, located at the second end of the internal circulation duct 402, i.e., the seventh panel 250, is tilted upward along the air outlet direction of the internal circulation duct 402 so that the airflow in the internal circulation duct 402 blows smoothly and gently towards the internal circulation outlet 603, thereby reducing noise.

[0061] like Figure 2 As shown, the enclosure 100 includes a first enclosure 110 and a second enclosure 120. The first end of the first enclosure 110 and the first end of the second enclosure 120 are spaced apart to form an external exhaust vent 101. The second end of the first enclosure 110 is bent toward the external exhaust vent 101 to partially surround the volute inlet 204. A volute tongue 111 is formed at the second end of the first enclosure 110. The second end of the second enclosure 120 is bent toward the first enclosure 110 and extends to the outer wall of the second enclosure 120. A valve plate 300 is pivotally disposed between the second end of the first enclosure 110 and the second enclosure 120.

[0062] To reduce airflow separation at the second end of the internal circulation duct 402 and simultaneously lower noise, the corner at the second end of the second enclosure 120 is rounded. Alternatively, to further reduce noise, the surface of the base plate 200 at the second end of the internal circulation duct 402 can also be configured to slope upwards along the airflow direction of the internal circulation duct 402. Specifically, as... Figure 5As shown, the profile of the second baffle plate 120 comprises a straight line and a U-shaped curve, that is, the second baffle plate 120 comprises a straight plate and a U-shaped plate, the straight plate is arranged in parallel with the first baffle plate 110, the U-shaped plate is located in front of the first baffle plate 110, that is, towards the side of the user, and the opening of the U-shaped curve faces the outer exhaust air outlet 101. The profile of the first baffle plate 110 comprises an Archimedes spiral. Compared with the four-arc commonly used in the prior art, the design idea of the present embodiment is based on the equi-velocity curve, and by designing the profile of the first baffle plate 110 as an Archimedes spiral, the circumferential flow of the airflow in the outer exhaust air duct 401 can be more uniform.

[0063] As shown in Figure 2 and Figure 3 The first end of the valve piece 300 is pivotally mounted on the second baffle plate 120, and the second end of the valve piece 300 extends to the second end of the first baffle plate 110. When it is needed to connect the inner circulation air duct 402 and the outer exhaust air duct 401, the second end of the valve piece 300 is turned towards the side where the second baffle plate 120 is located, that is, the valve piece 300 is counterclockwise. When it is needed to separate the inner circulation air duct 402 and the outer exhaust air duct 401, the second end of the valve piece 300 is turned away from the second baffle plate 120, that is, the valve piece 300 is clockwise. Of course, the first end of the valve piece 300 can also be mounted on the second end of the first baffle plate 110, and the second end of the valve piece 300 extends to the second baffle plate 120. Similarly, an axial hole can also be formed in the valve piece 300 along the center line of the valve piece 300, the shaft rod is fixed on the bottom plate 200 and inserted into the axial hole, and the first end and the second end of the valve piece 300 extend to the first baffle plate 110 and the second baffle plate 120, respectively. Compared with the mode that the middle part of the valve piece 300 is pivotally connected with the bottom plate 200, the mode that the end part of the valve piece 300 is pivotally connected with the first baffle plate 110 or the second baffle plate 120 can make the valve piece 300 have less influence on the airflow in the inner circulation air duct 402. In addition, it should be noted that, in addition to the mode that the valve piece 300 is pivotally connected with the bottom plate 200, the valve piece 300 can also be connected with the bottom plate 200 in a translational mode, for example, the second baffle plate 120 is formed with a plug hole, and the valve piece 300 is plug-in connected in the plug hole. When it is needed to connect the inner circulation air duct 402 and the outer exhaust air duct 401, the valve piece 300 is gradually pulled out, so that the area of the valve piece 300 between the first baffle plate 110 and the second baffle plate 120 gradually decreases. When it is needed to separate the inner circulation air duct 402 and the outer exhaust air duct 401, the valve piece 300 is gradually inserted into the plug hole until the valve piece 300 abuts against the first baffle plate 110.

[0064] As shown in Figure 5 and Figure 6As shown in the drawings, the present application also provides a fan assembly, which comprises the fan and the volute described above, and the fan is installed at the air inlet 204 of the volute. The fan comprises a motor 510 and an impeller 520 fixed on the output shaft of the motor 510.

[0065] As shown in the drawings, Figures 7 to 10 As shown in the drawings, the present application also provides a range hood, which comprises a housing 600 and the fan assembly described above, and the volute is arranged in the housing 600. The housing 600 is formed with an air inlet corresponding to the air inlet 204 of the volute and an air outlet communicating with the air duct 400.

[0066] In the case that the air duct 400 comprises an outer exhaust air duct 401 and an inner circulating air duct 402, the volute is arranged on the top surface of the housing 600, and the air outlet of the volute comprises an inner circulating air outlet 603 and openable and closable upper and rear air outlets 601 and 602. The upper air outlet 601 is formed at the rear end of the top surface of the housing 600, and the upper air outlet 601 communicates with the outer exhaust air duct 401. The rear air outlet 602 is formed on the rear side wall of the housing 600, and the rear air outlet 602 is arranged corresponding to the outer exhaust air outlet 101. The inner circulating air outlet 603 is formed at the front end of the top surface of the housing 600, and the inner circulating air outlet 603 communicates with the second end of the inner circulating air duct 402.

[0067] As shown in the drawings, Figure 7 As shown in the drawings, the housing 600 comprises a side wall, a top cover plate 630 and a bottom cover plate. The side wall comprises a front side plate, a left side plate 620, a rear side plate 610 and a right side plate connected in sequence from front to back. The top cover plate 630 is arranged above the side wall, and the bottom cover plate is arranged below the side wall. The top cover plate 630 comprises a front cover plate 631 and a rear cover plate 632. The rear end of the front cover plate 631 is connected with the rear cover plate 632. The front end of the front cover plate 631 extends to the front side plate. The rear end of the rear cover plate 632 extends to the rear side plate 610. The front cover plate 631 is inclined upward from the front end to the rear end. The inner circulating air outlet 603 is formed in the front cover plate 631. The upper air outlet 601 is formed in the rear cover plate 632. The rear air outlet 602 is formed in the rear side plate 610. The volute is arranged on the top cover plate 630, that is, the volute does not comprise a top plate in this embodiment. The top of the air duct 400 is open. The top cover plate 630 of the housing 600 seals the air duct 400 of the volute. Of course, the volute can also comprise a top plate arranged opposite to the bottom plate 200. The side wall 100 is arranged between the top plate and the bottom plate 200. Figure 1 and Figure 8As shown, the bottom plate 200 includes a first panel 210, a second panel 220, a fourth panel 230, a sixth panel 240 and a seventh panel 250, the first panel 210 is connected with the second panel 220 through a first step surface 201, the second panel 220 is connected with the fourth panel 230 through a second step surface 202, the fourth panel 230 is connected with the sixth panel 240 through a third step surface 203, and an end of the sixth panel 240 away from the third step surface 203 is connected with the seventh panel 250. The seventh panel 250 is inclined upward along the air outlet direction of the inner circulation air duct 402, so that the airflow in the inner circulation air duct 402 flows smoothly to the inner circulation air outlet 603, thereby reducing the noise. On this basis, due to the existence of the first step surface 201, the second step surface 202 and the third step surface 203, the spacing between the seventh panel 250 and the back cover plate 632 < the spacing between the sixth panel 240 and the back cover plate 632 < the spacing between the fourth panel 230 and the back cover plate 632 < the spacing between the second panel 220 and the back cover plate 632 < the spacing between the first panel 210 and the back cover plate 632.

[0068] In the present embodiment, the range hood is provided with an inner circulation air outlet 603, an upper air outlet 601 and a rear air outlet 602. Before the range hood is shipped, sealing cover plates are arranged at the upper air outlet 601 and the rear air outlet 602, and the sealing cover plates can be fixed to the cabinet 600 by pasting. The user can select one of the three exhaust modes, i.e., the rear air outlet mode, the upper air outlet mode and the inner circulation air outlet mode, according to actual needs when installing the range hood:

[0069] When the user selects the rear air outlet mode, the sealing cover plate arranged at the rear air outlet 602 is torn off, the sealing cover plate arranged at the upper air outlet 601 is retained, and the valve plate 300 is switched to the closed position to block the inner circulation air duct 402 and the outer exhaust air duct 401. The indoor oil fume is sequentially sucked into the volute through the cabinet air inlet and the volute air inlet 204, and flows along the outer exhaust air duct 401 towards the outer exhaust air outlet 101. Since the flow area of the outer exhaust air duct 401 at the volute tongue 111 is the smallest, the airflow will expand after passing through the volute tongue 111. The existence of the first step surface 201 can reduce the flow area of the outer exhaust air duct 401 downstream of the first step surface 201, so as to slow down the expansion amplitude while ensuring that the airflow continues to expand after passing through the volute tongue 111. Since the sealing cover plate arranged at the outer exhaust air outlet 101 has been torn off, when the flue gas reaches the outer exhaust air outlet 101, the flue gas sequentially passes through the outer exhaust air outlet 101 and the rear air outlet 602 into the flue, and is finally discharged outdoors.

[0070] When the user selects the upper air outlet mode, the sealing cover plate covering the upper air outlet 601 is torn off, the sealing cover plate covering the rear air outlet 602 is retained, and the valve plate 300 is switched to the closed position to cut off the inner circulating air duct 402 and the outer exhaust air duct 401. The indoor oil fume is sequentially sucked into the volute through the cabinet air inlet and the volute air inlet 204, and flows along the outer exhaust air duct 401 towards the outer exhaust air outlet 101. Since the rear air outlet 602 is covered by the sealing cover plate, the oil fume cannot enter the flue through the rear air outlet 602 after reaching the outer exhaust air outlet 101, and the smoke is blocked by the rear side plate 610 of the cabinet and is folded back. Due to the presence of the second step surface 202, when the folded-back part of the smoke flows obliquely upwards under the guidance of the second step surface 202, the airflow blowing onto the valve plate 300 can be reduced, thereby reducing the impact on the valve plate 300, prolonging the service life of the valve plate 300, and also reducing the noise and kinetic energy loss of the airflow. As the smoke in the outer exhaust air duct 401 increases, the smoke eventually enters the flue through the upper air outlet 601 and is finally discharged outdoors.

[0071] When the user selects the inner circulating air outlet mode, the sealing cover plates covering the upper air outlet 601 and the rear air outlet 602 are retained, and the valve plate 300 is switched to the open position to make the inner circulating air duct 402 and the outer exhaust air duct 401 communicate. The indoor oil fume is sequentially sucked into the volute through the cabinet air inlet and the volute air inlet 204, and flows along the outer exhaust air duct 401 towards the outer exhaust air outlet 101. Since the upper air outlet 601 and the rear air outlet 602 are both covered by the sealing cover plates, the oil fume cannot enter the flue through the rear air outlet 602 and the upper air outlet 601 after reaching the outer exhaust air outlet 101, and the smoke is blocked by the rear side plate 610 of the cabinet and is folded back, and the folded-back smoke enters the inner circulating air duct 402. Due to the presence of the third step surface 203, when the smoke in the inner circulating air duct 402 flows through the third step surface 203, it flows obliquely upwards under the guidance of the third step surface 203, so that the main flow direction of the smoke is towards the center of the inner circulating air outlet 603, and thus the smoke can be quickly discharged into the room through the inner circulating air outlet 603. In addition, the presence of the third step surface 203 can also reduce the impact of the airflow on the cabinet 600 near the inner circulating air outlet 603.

[0072] The fan assembly and the range hood in the embodiment of the present application can install a thicker fan in the thicker space upstream of the step surface of the bottom plate 200 of the volute by making the plate surface downstream of the step surface of the bottom plate 200 protrude relative to the plate surface upstream of the step surface, thereby ensuring the air volume and reducing the noise, and the presence of the step surface can also improve the performance such as the noise and the air speed in the space downstream of the step surface of the air duct 400, thereby improving the overall performance of the machine.

[0073] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

[0074] The above embodiments are only used to illustrate the present application, but not limit the present application. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present application do not deviate from the spirit and scope of the technical solutions of the present application, and should be covered in the scope of claims of the present application.

Claims

1. A volute, characterized in that, The application relates to a volute, comprising: a surrounding plate formed with a volute tongue; a bottom plate arranged below the surrounding plate to form an air duct together with the surrounding plate; the bottom plate is formed with a volute inlet located upstream of the volute tongue and a step surface located downstream of the volute tongue; the step surface is inclined upward along the air outlet direction of the air duct, so that the plate surface of the bottom plate located downstream of the step surface is convex relative to the plate surface located upstream of the step surface; the surrounding plate is formed with an external air outlet located downstream of the volute tongue, and the air duct comprises an external air duct located between the volute inlet and the external air outlet; the air duct further comprises an internal circulation air duct, a first end of the internal circulation air duct communicates with the external air duct, and a second end of the internal circulation air duct extends in a direction opposite to the air outlet direction of the external air outlet; the first end of the internal circulation air duct is provided with a valve piece, and the valve piece is switched between an open position for communicating the internal circulation air duct and the external air duct and a closed position for isolating the internal circulation air duct and the external air duct; the step surface comprises a first step surface arranged close to the volute tongue, a second step surface arranged close to the valve piece and a third step surface located on the side of the valve piece away from the external air outlet; the first step surface is inclined upward along the air outlet direction of the external air duct, so that the plate surface of the bottom plate located between the first step surface and the external air outlet is convex relative to the plate surface located upstream of the first step surface; the second step surface is inclined upward along the air outlet direction of the internal circulation air duct, so that the plate surface of the bottom plate located downstream of the second step surface is convex relative to the plate surface located between the second step surface and the external air outlet; the third step surface is inclined upward along the air outlet direction of the internal circulation air duct, so that the plate surface of the bottom plate located downstream of the third step surface is convex relative to the plate surface located upstream of the third step surface.

2. The volute of claim 1, wherein The inclination angle of the first step surface relative to the horizontal plane is not greater than 45 degrees.

3. The volute of claim 1, wherein The inclination angle of the second step surface relative to the horizontal plane is 30-60 degrees.

4. The volute of claim 1, wherein, The inclination angle of the third step surface relative to the horizontal plane is not greater than 45 degrees.

5. The volute of claim 1, wherein, The plate surface of the bottom plate located at the second end of the internal circulation air duct is inclined upward along the air outlet direction of the internal circulation air duct.

6. The volute of claim 1, wherein, The surrounding plate comprises a first surrounding plate and a second surrounding plate, the first end of the first surrounding plate and the first end of the second surrounding plate are arranged at intervals to form the external air outlet; the second end of the first surrounding plate is bent towards the external air outlet to semi-enclose the volute inlet, and the volute tongue is formed in the second end of the first surrounding plate; the second end of the second surrounding plate is bent towards the first surrounding plate and extends to the outer wall of the second surrounding plate, and the valve piece is pivotally arranged between the second end of the first surrounding plate and the second surrounding plate.

7. The volute of claim 6, wherein The profile line of the first surrounding plate comprises an Archimedes spiral.

8. The volute of claim 6, wherein, The corner of the second end of the second surrounding plate is a rounded corner.

9. A fan assembly, comprising: The application further relates to a fan and a volute according to any one of claims 1 to 8, wherein the fan is installed in the volute inlet.

10. A range hood characterized by, The fan assembly as claimed in claim 9, wherein the fan assembly further comprises a casing, and the volute is arranged in the casing, the casing is formed with a casing air inlet corresponding to the volute air inlet and a volute air outlet communicating with the air duct.

11. The hood according to claim 10, characterized in that, In the case that the air duct comprises an outer exhaust air duct and an inner circulating air duct, the volute is arranged on the top surface of the casing, the volute air outlet comprises an inner circulating air outlet and openable and closable upper and rear air outlets, the upper air outlet is formed on the rear end of the top surface of the casing and communicates with the outer exhaust air duct, the rear air outlet is formed on the rear side wall of the casing and is arranged corresponding to the outer exhaust air outlet, and the inner circulating air outlet is formed on the front end of the top surface of the casing and communicates with the second end of the inner circulating air duct.

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