Volute, range hood and volute tongue

Abstract

The invention relates to the technical field of kitchen use, and provides a volute, a range hood and a volute tongue. The volute comprises a shell, an impeller and a volute tongue. The shell is provided with an air outlet; the impeller is installed in the shell, the radius of the impeller is R, the impeller is provided with a plurality of blades, and the gap between any two adjacent blades at the air outlet end is L; the volute tongue is installed at the air outlet and provided with a rear inner concave face and a front inner concave face which are connected in the length direction, one end of the rear inner concave face is a rear molded line, the other end of the rear inner concave face is connected with one end of the front inner concave face, a connecting line of the rear inner concave face and the front inner concave face is a middle molded line, the other end of the front inner concave face is a front molded line, and a prototype line is arranged on the volute tongue. The rotation included angle between the rear molded line and the prototype line around the axis of the impeller is beta 1, and beta 1 is larger than or equal to 0.5 L / R and smaller than or equal to 2L / R. According to the volute provided by the invention, the volute tongue structure is improved, so that the impact of airflow on the volute tongue is reduced, and the noise at the volute tongue is reduced.

Description

Technical Field

[0001] This application relates to the technical field of kitchen appliances, and particularly to a volute, a range hood, and a volute tongue. Background Art

[0002] Range hoods have become one of the essential kitchen appliances in ordinary families. The noise of range hoods generally comes from two aspects: one is the noise of the fan itself, and the other is the noise generated by the airflow flowing in the fan volute. The volute of a range hood includes a housing and a volute tongue. Among them, due to the continuous strong impact of the centrifugal fan outlet airflow on the volute tongue area, it has become one of the main aerodynamic noise sources of the centrifugal fan, and the structure and position of the volute tongue have a greater impact on the internal flow field of the fan. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the related art. For this purpose, this application proposes a volute, which reduces the impact of the airflow on the volute tongue by improving the volute tongue structure, thereby reducing the noise at the volute tongue.

[0004] This application also proposes a range hood.

[0005] This application also proposes a volute tongue.

[0006] The volute provided according to this application includes:

[0007] A housing having an air outlet;

[0008] An impeller installed in the housing, the radius of the impeller being R, the impeller having a plurality of blades, and the gap between any two adjacent blades at the air outlet end being L;

[0009] A volute tongue installed at the air outlet, the volute tongue having a rear concave surface and a front concave surface connected in the length direction, both the rear concave surface and the front concave surface facing the air outlet; one end of the rear concave surface is a rear profile line, the other end of the rear concave surface is connected to one end of the front concave surface, the connection line between the rear concave surface and the front concave surface is a middle profile line, and the other end of the front concave surface is a front profile line.

[0010] A prototype profile line is provided on the volute tongue, and the front profile line, the rear profile line, and the middle profile line are obtained by rotating and stretching the prototype profile line around the axis of the impeller. On the projection of the end face in the length direction of the volute tongue, the rear profile line, the front profile line, the prototype profile line, and the middle profile line are sequentially spaced apart in the circumferential direction of the impeller.

[0011] The rotation angle between the rear profile line and the prototype profile line around the axis of the impeller is β1, and 0.5L / R ≤ β1 ≤ 2L / R.

[0012] According to the volute provided by the present application, the front curve, rear curve and middle curve are obtained by rotating and stretching the prototype curve of the volute tongue around the axis of the impeller. And on the projection of the end face in the length direction of the volute tongue, the rear curve, front curve, prototype curve and middle curve are spaced apart in sequence along the circumferential direction of the impeller. The rotation angle between the rear curve and the prototype curve around the axis of the impeller is β1, and 0.5L / R ≤ β1 ≤ 2L / R, so that the rear concave surface can match the flow velocity at the rear end of the impeller of the centrifugal fan, thereby improving the impact of the air flow at the air outlet on the volute tongue and reducing the noise generated at the volute tongue of the fan housing of the range hood during use.

[0013] According to an embodiment of the present application, the rotation angle between the middle curve and the prototype curve around the axis of the impeller is β2, and 0.5L / R ≤ β2 ≤ 1.5L / R.

[0014] According to an embodiment of the present application, the rotation angle between the front curve and the prototype curve around the axis of the impeller is β3, and 0.5L / R ≤ β3 ≤ β1 ≤ 2L / R.

[0015] According to an embodiment of the present application, the height of the impeller is D, and the distance between the middle disc of the impeller and the middle curve is L1, where L1 ≤ 0.1D.

[0016] According to an embodiment of the present application, the projection of the rear concave surface on the plane where the air outlet is located is a first curve, the projection of the front concave surface on the plane where the air outlet is located is a second curve, and the curvature of the first curve is greater than or equal to the curvature of the second curve.

[0017] According to an embodiment of the present application, the outer surface of the volute tongue further includes:

[0018] A plane, both the rear concave surface and the front concave surface are connected to one side of the plane;

[0019] A rear end face, the rear end face is connected to the rear concave surface, and the connecting line between the rear end face and the rear concave surface is the rear curve;

[0020] A front end face, the rear end face and the front end face are the end faces in the length direction of the volute tongue, the front end face is connected to the front concave surface, and the connecting line between the front end face and the front concave surface is the front curve.

[0021] According to an embodiment of the present application, the housing includes:

[0022] A first plate body, the first plate body is connected to the rear end face;

[0023] A second plate body, the second plate body is disposed opposite to the first plate body, and the second plate body is connected to the front end face;

[0024] A shroud, wherein the shroud, the first plate body and the second plate body together form a receiving space, the impeller is installed in the receiving space, and multiple blades are arranged along the circumference of the receiving space.

[0025] According to an embodiment of the present application, the shroud is cylindrical, and the plane is tangent to the circumference of the shroud.

[0026] The range hood provided by the present application includes:

[0027] A volute, and the volute is the above-mentioned volute;

[0028] A box body, wherein there is an air duct in the box body, and the volute is arranged in the air duct.

[0029] According to the volute tongue provided by the present application, the volute tongue is installed at the air outlet of the volute. The volute tongue has a rear concave surface and a front concave surface connected in the length direction, and both the rear concave surface and the front concave surface face the air outlet; one end of the rear concave surface is a rear profile line, the other end of the rear concave surface is connected to one end of the front concave surface, the connection line between the rear concave surface and the front concave surface is a middle profile line, and the other end of the front concave surface is a front profile line.

[0030] A prototype line is provided on the volute tongue, and the front profile line, the rear profile line and the middle profile line are obtained by rotating and stretching the prototype line around the center of the impeller. In the projection on the end surface in the length direction of the volute tongue, the rear profile line, the front profile line, the prototype line and the middle profile line are sequentially spaced apart along the circumferential direction of the impeller.

[0031] The rotation angle between the rear profile line and the prototype line around the axis of the impeller is β1, and 0.5L / R ≤ β1 ≤ 2L / R; the rotation angle between the middle profile line and the prototype line around the axis of the impeller is β2, and 0.5L / R ≤ β2 ≤ 1.5L / R; the rotation angle between the front profile line and the prototype line around the axis of the impeller is β3, and 0.5L / R ≤ β3 ≤ β1 ≤ 2L / R.

[0032] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic diagram of the volute structure provided by this application;

[0035] Figure 2 It is a schematic diagram of the volute tongue structure provided by this application;

[0036] Figure 3 It is a schematic diagram of the projections of the rear profile line, front profile line, original profile line, and middle profile line on the end face in the length direction of the volute tongue provided by this application;

[0037] Figure 4 It is another schematic diagram of the volute structure provided by this application;

[0038] Figure 5 is Figure 4 The partial enlarged view at position A of

[0039] Reference numerals:

[0040] 100, volute; 110, housing; 111, air outlet; 112, first plate body; 113, second plate body; 114, enclosing plate; 115, accommodating space;

[0041] 120, impeller; 121, blade; 123, middle disc;

[0042] 130, volute tongue; 131, rear concave surface; 132, front concave surface; 133, rear profile line; 134, middle profile line; 135, front profile line; 136, original profile line; 137, plane; 138, front end face; 139, connecting face. Detailed implementation manners

[0043] The following further describes in detail the implementation manners of this application in conjunction with the drawings and embodiments. The following embodiments are used to illustrate this application, but cannot be used to limit the scope of this application.

[0044] In the description of the embodiments of this application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of this application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified or limited, the terms "connected" and "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0046] In the embodiments of the present application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely means that the first feature has a lower horizontal height than the second feature.

[0047] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0048] The range hood has become one of the essential kitchen appliances in ordinary families. The noise of the range hood generally comes from two aspects: one is the noise of the fan itself, and the other is the noise generated by the airflow flowing in the fan volute. The volute of the range hood includes a volute body, a volute tongue, an air outlet, and an air inlet. Among them, the volute body is a spiral disk. The volute body is composed of a volute body panel with a cross-section of a spiral curve and left and right side plates. The left and right side plates are installed on both sides of the volute body panel to form a spiral disk. An air inlet is provided on the side of the volute body, and an impeller is provided inside the volute body at a position corresponding to the air inlet. The volute tongue is located at the starting position of the volute thread of the volute body, and the air outlet is an opening located at the end position of the volute spiral of the volute body. In this way, when the impeller rotates under the action of the motor, the air in the volute body is discharged out of the volute body by the impeller, forming a negative pressure in the volute body. After the oil fume enters the air inlet under the action of the negative pressure, it is discharged out of the volute body under the action of the impeller. The disadvantage of the volute of this kind of range hood is that the noise of the airflow in the volute is relatively large.

[0049] The main function of the volute tongue of the fan for the range hood is to intercept the flow. Generally speaking, the volute tongue can be divided into a pointed tongue, a deep tongue, a short tongue, and a flat tongue. For the traditional straight volute tongue, the deeper the volute tongue, the smaller the gap between it and the impeller, and the efficiency is improved. However, in this way, the noise at the volute tongue will increase. The flow velocity distribution of the airflow in the volute along the axial direction is basically a quadratic curve distribution with a large flow velocity in the middle and small flow velocities at both ends. Near the air outlet of the fan, due to the large velocity in the middle and small velocities at both ends, there is an obvious secondary flow flowing from the middle to the left and right sides, forming large vortices. This phenomenon is common in traditional straight volute tongue fans.

[0050] As Figure 1 and Figure 2 shown, the present application provides a volute 100, including a housing 110, an impeller 120, and a volute tongue 130. It should be noted that the volute 100 of the present application is applied to the range hood. The main function of the volute 100 is to control or guide the movement of the airflow. After the range hood is started, the motor drives the wind wheel to rotate. Due to the action of the wind wheel discharging the airflow outward, a negative pressure area is formed inside, generating suction. The wind wheel rotates to accelerate the flue gas, so that the airflow velocity is rapidly increased. Such an airflow is more conducive to the movement and discharge of the flue gas. The accelerated airflow enters the volute 100, and the residence time in the volute 100 increases. Due to the shape design of the volute 100, the vortex formed by the airflow inside promotes the further acceleration of the airflow and reduces the noise of the range hood. The airflow guided and accelerated by the volute 100 finally discharges from the air outlet 111 to realize the discharge of the oil fume.

[0051] Specifically, as Figure 1As shown, the housing 110 has an air outlet 111. The impeller 120 is installed inside the housing 110. The radius of the impeller 120 is R. The impeller 120 has multiple blades 121. The gap between any two adjacent blades 121 at the air outlet end is L. The volute 100 is installed at the air outlet 111.

[0052] As Figure 2 shown, the volute tongue 130 has a rear concave surface 131 and a front concave surface 132 connected in the length direction. Both the rear concave surface 131 and the front concave surface 132 face the air outlet 111. It should be noted that the concave surface design of the volute tongue 130 can help collect the air pushed by the blades 121 and smoothly guide the air into the air duct of the range hood. In this way, the turbulence and backflow of air inside the fan volute 100 can be reduced, and the exhaust efficiency of the fan can be improved. Among them, the concave surface structure of the volute tongue 130 helps to smooth the air flow and reduce the probability of generating eddy currents and turbulence of the fan air flow at the volute tongue 130, thereby reducing the noise generated during the operation of the fan. Since the air flow is better guided, the energy loss is reduced, so the energy conversion efficiency of the fan is higher and the energy consumption is relatively lower. And the good air flow guidance helps the range hood to discharge the fumes faster and more thoroughly, avoiding the retention of fumes in the kitchen.

[0053] Among them, one end of the rear concave surface 131 is the rear profile line 133. One end of the rear concave surface 131 is connected to one end of the front concave surface 132. The connecting line between the rear concave surface 131 and the front concave surface 132 is the middle profile line 134. The other end of the front concave surface 132 is the front profile line 135. The volute tongue 130 is provided with a prototype profile line 136. As Figure 3 shown, the prototype profile line 136 is rotationally stretched around the axis of the impeller 120 to obtain the front profile line 135, the rear profile line 133 and the middle profile line 134. And on the projection of the end face of the volute tongue 130 in the length direction, the rear profile line 133, the front profile line 135, the prototype profile line 136 and the middle profile line 134 are sequentially spaced apart in the circumferential direction of the impeller 120. Among them, the rotation angle between the rear profile line 133 and the prototype profile line 136 around the axis of the impeller 120 is β1, and 0.5L / R ≤ β1 ≤ 2L / R.

[0054] It can be understood that for the volute tongue 130 provided in this application, the rear profile line 133 on the volute tongue 130 is the profile line obtained by rotating the prototype line 136 around the axis of the impeller 120 by an angle of β1, and β1 is greater than or equal to 0.5 times the ratio of L to R, and at the same time β1 is less than or equal to 2 times the ratio of L to R. That is to say, the value range of β1 is between 0.5 times the ratio of L to R and 2 times the ratio of L to R. For example, β1 can be the ratio of L to R. Since the air flow characteristics in the centrifugal fan are that the air flow velocity in the middle of the impeller 120 is large, the air flow velocity at both ends of the impeller 120 is small, and the flow velocity at the front end of the impeller 120 is less than the flow velocity at the rear end of the impeller 120. And for the volute tongue 130 of this application, the rear profile line 133 is in the rear direction of the impeller 120. Therefore, after modifying the rear profile line 133 of the volute tongue 130 provided in this application, the rear concave surface 131 can match the flow velocity difference at the rear part of the impeller 120, improving the air flow efficiency.

[0055] For the volute 100 provided in this application, by rotating and stretching the prototype line 136 of the volute tongue 130 around the axis of the impeller 120, the front profile line 135, the rear profile line 133 and the middle profile line 134 are obtained. And on the projection of the end surface in the length direction of the volute tongue 130, the rear profile line 133, the front profile line 135, the prototype line 136 and the middle profile line 134 are spaced apart in turn along the circumferential direction of the impeller 120. The rotation angle between the rear profile line 133 and the prototype line 136 around the axis of the impeller 120 is β1, and 0.5L / R ≤ β1 ≤ 2L / R, so that the rear concave surface 131 can match the flow velocity at the rear end of the impeller 120 of the centrifugal fan, thereby improving the impact of the air flow at the air outlet 111 on the volute tongue 130 and reducing the noise generated at the volute tongue of the fan volute 100 when the range hood is in use.

[0056] As Figure 2 shown, in some embodiments of this application, the rotation angle between the middle profile line 134 and the prototype line 136 around the axis of the impeller 120 is β2, and 0.5L / R ≤ β2 ≤ 1.5L / R. It can be understood that in this embodiment, the middle profile line 134 on the volute tongue 130 is the profile line obtained by rotating the prototype line 136 around the axis of the impeller 120 by an angle of β2, and β2 is greater than or equal to 0.5 times the ratio of L to R, and at the same time, β2 is less than or equal to 1.5 times the ratio of L to R. That is to say, the value range of β2 is between 0.5 times the ratio of L to R and 1.5 times the ratio of L to R. For example, β2 can be the ratio of L to R. In this way, the rear concave surface 131 can match the flow velocity at the middle end of the impeller 120 of the centrifugal fan, further improving the impact of the air flow at the air outlet 111 on the volute tongue 130 and reducing the noise generated at the volute tongue of the fan volute 100 when the range hood is in use.

[0057] As Figure 2As shown, in some embodiments of the present application, the rotation angle between the front profile line 135 and the prototype line 136 around the axis of the impeller 120 is β3, and 0.5L / R ≤ β3 ≤ β1 ≤ 2L / R. It can be understood that in this embodiment, the front profile line 135 on the volute tongue 130 is the profile line obtained after the prototype line 136 rotates around the axis of the impeller 120 by an angle of β3, and β3 is greater than or equal to 0.5 times the ratio of L to R. At the same time, β3 is less than or equal to the value of β1. That is to say, the value range of β3 is between 0.5 times the ratio of L to R and the value of β1. For example, when β1 is the ratio of L to R, β3 can also be the ratio of L to R. In this way, the flow velocity at the front end of the impeller 120 of the front concave surface 132 can be matched with that of the centrifugal fan, further improving the impact of the airflow at the air outlet 111 on the volute tongue 130, and reducing the noise generated at the volute tongue of the fan volute 100 when the range hood is in use.

[0058] Since when the volute 100 is working, the airflow in the middle of the volute 100 will pass through the middle profile line of the volute tongue 130, and the airflow velocity in the middle of the volute 100 is the largest. Therefore, in order to further reduce the impact of the airflow at the outlet on the volute tongue 130, the selection of the position of the middle profile line 134 of the volute tongue 130 is also crucial. As Figure 4 and Figure 5 shown, in some embodiments of the present application, the height of the impeller 120 is D, and the distance between the middle disk 123 of the impeller 120 and the middle profile line 134 is L1, where L1 ≤ 0.1D. In this way, on the premise of ensuring the effective operation of the volute 100, the impact of the airflow in the middle of the volute 100 on the volute tongue 130 can be minimized, thereby improving the stability and service life of the volute 100.

[0059] As Figure 4 shown, in some embodiments of the present application, the projection of the rear concave surface 131 on the plane 137 where the air outlet 111 is located is the first curve, and the projection of the front concave surface 132 on the plane 137 of the air outlet 111 is the second curve, and the curvature of the first curve is greater than the curvature of the second curve. Or, in some other embodiments of the present application, the curvature of the first curve is equal to the curvature of the second curve. In this way, the velocity of the airflow at the air outlet 111 on the volute tongue 130 can be increased, and the probability of the airflow at the air outlet 111 forming a vortex at the volute tongue 130 can be reduced, thereby optimizing the airflow guidance inside the volute 100, reducing the energy consumption of the entire range hood, improving the exhaust effect, and further reducing the operating noise of the range hood, thereby enhancing the overall performance and user experience of the range hood.

[0060] As Figure 2As shown, in some embodiments of the present application, the outer surface of the volute tongue 130 further includes a flat surface 137, a rear end surface (not shown in the figure), and a front end surface 138. Among them, the rear concave surface 131 and the front concave surface 132 are both connected to one side of the flat surface 137. The rear end surface is connected to the rear concave surface 131, and the connecting line between the rear end surface and the rear concave surface 131 is the rear profile line 133. The rear end surface and the front end surface 138 are the end surfaces in the length direction of the volute tongue 130. The front end surface 138 is connected to the front concave surface 132, and the connecting line between the front end surface 138 and the front concave surface 132 is the front profile line 135. The streamlined design of the volute tongue 130 can further optimize the air flow guidance inside the volute 100 by the volute tongue 130, reduce the energy consumption of the entire range hood, improve the exhaust effect, and further reduce the operating noise of the range hood, thereby enhancing the overall performance and user experience of the range hood.

[0061] As Figure 1 shown, in some embodiments of the present application, the housing 110 includes a first plate body 112, a second plate body 113, and a shroud 114. Among them, the first plate body 112 is connected to the rear end surface, the second plate body 113 is disposed opposite to the first plate body 112, and the second plate body 113 is connected to the front end surface 138. The shroud 114, the first plate body 112, and the second plate body 113 together form an accommodation space 115, and the impeller 120 is installed in the accommodation space 115. In this way, after the air is inhaled by the impeller 120, it can perform efficient axial movement, increasing the air volume and enhancing the air pressure. The multiple blades 121 are arranged along the circumferential direction of the accommodation space 115, which can make the air volume larger and the negative pressure stronger, and can better inhale and exhaust the flue gas. By symmetrically arranging the first plate body 112 and the second plate body 113, the stability of the volute 130 is improved, so that the impeller 120 is more stable during high-speed rotation, reducing the vibration of the impeller 120, further reducing the noise at the volute 100, and the overall shape of the entire volute 100 is also more compact, reducing the size of the volute 100, which is beneficial to the design of miniaturized equipment.

[0062] As Figure 2 shown, in some embodiments of the present application, the outer surface of the volute 100 further includes a connection surface 139, the connection surface 139 is connected to the other side of the flat surface 137, and the connection surface 139 is detachably connected to the shroud 114 by bolts. In this way, the volute tongue 130 can be fixed to the volute 100, realizing the convenient installation of the volute tongue 130 on the volute 100 and facilitating later maintenance.

[0063] For example, if it is necessary to clean or replace the volute tongue 130, only need to simply loosen the bolts and then remove the volute tongue 130 to perform cleaning or replacement, which significantly improves the maintenance efficiency and convenience of the range hood and reduces the maintenance cost.

[0064] In addition, since the volute tongue 130 is detachably connected to the volute casing 100 through the connecting surface 139, the volute casing 100 can consider different size and shape requirements during design to adapt to various types of range hoods or different usage environments. This design increases the applicable range of the product, improves the flexibility and universality of the product, and also makes it more convenient for the range hood to provide customization services, meeting the personalized needs of more consumers.

[0065] As Figure 1 and Figure 4 shown, in some embodiments of the present application, the shroud 114 is cylindrical, and the plane 137 of the volute tongue 130 is tangent to the circumference of the shroud 114. In this way, the volute tongue 130 can prevent the gas from circulating in the volute casing 100, optimize the gas flow path inside the volute casing 100, reduce the vortices and impacts in the gas flow, improve the gas flow efficiency, and further reduce the noise of the volute casing 100.

[0066] As Figures 1 to 5 shown, when the volute casing 100 provided in the present application is working, the flow velocity of the air flow inside the volute casing 100 is basically large in the middle and small at both ends along the axial direction. And the air flow in the middle of the volute casing 100 will pass through the median line of the volute tongue 130, the air flow at the rear end of the volute casing 100 will pass through the rear concave surface of the volute tongue 130, and the air flow at the front end of the volute casing 100 will pass through the front concave surface of the volute tongue 130. By eccentrically processing the front concave surface 132 and the rear concave surface 131 of the volute tongue 130, in this way, the generation of vortices at the volute tongue 130 can be reduced, thereby reducing the noise. While helping the fan to minimize the noise, the fan can also achieve higher air volume and air pressure. And the eccentric processing of the concave surface of the volute tongue 130 can reduce the resistance suffered by the air flow during the flow process, thereby making the flow channel larger. The eccentric processing can optimize the air flow direction and make the air flow more uniform. This can not only improve the working efficiency of the fan but also reduce the energy consumption. The optimized air flow path also helps to reduce the vibration of the machine, thereby improving the stability and service life of the fan.

[0067] The present application also provides a range hood (not shown in the figure), including the volute casing 100 and a box body (not shown in the figure), wherein the volute casing 100 is the above-mentioned volute casing 100, and the box body has an air duct (not shown in the figure), and the volute casing 100 is arranged in the air duct. When the range hood is started, air is sucked into the air duct and guided into the volute casing 100. The main function of the volute casing 100 is to guide, accelerate and increase the power of the air flow.

[0068] For the range hood provided by the present application, a dedicated air duct is designed in the box body. After the range hood is started, the air duct can effectively transport the sucked air to the volute casing 100. The volute casing 100 is located in the air duct, and its shape and design enable the volute casing 100 to effectively guide and accelerate the air flow.

[0069] During operation, first, the range hood is started to inhale the surrounding smoke. Then, the inhaled air is sent into the air duct arranged in the box body, and the volute 100 in the air duct guides and accelerates this air, ultimately increasing the power of the air flow, effectively discharging the oil fume generated during the cooking process outdoors through the exhaust pipe, thereby achieving the purpose of cleaning the air and reducing the indoor oil fume concentration.

[0070] The design of the volute 100 also makes the range hood quieter, more efficient and easier to maintain during operation, so as to solve the impact of oil fume on the user's health and living environment.

[0071] As Figure 2 described, the present application also provides a volute tongue 130, which is installed at the air outlet 111 of the volute 100, and the volute tongue 130 has a rear concave surface 131 and a front concave surface 132 connected in the length direction, and both the rear concave surface 131 and the front concave surface 132 face the air outlet 111; one end of the rear concave surface 131 is a rear profile line 133, the other end of the rear concave surface 131 is connected to one end of the front concave surface 132, the connecting line of the rear concave surface 131 and the front concave surface 132 is a middle profile line 134, and the other end of the front concave surface 132 is a front profile line 135.

[0072] A prototype profile line 136 is provided on the volute tongue 130, and the front profile line 135, the rear profile line 133 and the middle profile line 134 are obtained by rotating and stretching the prototype profile line 136 around the center of the impeller 120. On the projection of the end face in the length direction of the volute tongue 130, the rear profile line 133, the front profile line 135, the prototype profile line 136 and the middle profile line 134 are spaced apart in turn along the circumferential direction of the impeller 120.

[0073] Wherein, the rotation angle between the rear profile line 133 and the prototype profile line 136 around the axis of the impeller 120 is β1, and 0.5L / R ≤ β1 ≤ 2L / R; the rotation angle between the middle profile line 134 and the prototype profile line 136 around the axis of the impeller 120 is β2, and 0.5L / R ≤ β2 ≤ 1.5L / R; the rotation angle between the front profile line 135 and the prototype profile line 136 around the axis of the impeller 120 is β3, and 0.5L / R ≤ β3 ≤ β1 ≤ 2L / R.

[0074] It can be understood that for the volute tongue 130 provided in this application, the rear profile line 133 on the volute tongue 130 is the profile line obtained by rotating the prototype line 136 around the axis of the impeller 120 by an angle of β1, and β1 is greater than or equal to 0.5 times the ratio of L to R, and at the same time, β1 is less than or equal to 2 times the ratio of L to R. That is to say, the value range of β1 is between 0.5 times the ratio of L to R and 2 times the ratio of L to R. For example, β1 can be the ratio of L to R. Due to the flow characteristic of the air in the centrifugal fan that the air flow velocity in the middle of the impeller 120 is large, the air flow velocity at both ends of the impeller 120 is small, and the flow velocity at the front end of the impeller 120 is less than the flow velocity at the rear end of the impeller 120. And for the volute tongue 130 of this application, the rear profile line 133 is in the rear direction of the impeller 120. Therefore, after modifying the rear profile line 133, the volute tongue 130 provided in this application can make the rear concave surface 131 match the flow velocity difference of the rear part of the impeller 120, and improve the air flow efficiency.

[0075] The middle profile line 134 on the volute tongue 130 is the profile line obtained by rotating the prototype line 136 around the axis of the impeller 120 by an angle of β2, and β2 is greater than or equal to 0.5 times the ratio of L to R, and at the same time, β2 is less than or equal to 1.5 times the ratio of L to R. That is to say, the value range of β2 is between 0.5 times the ratio of L to R and 1.5 times the ratio of L to R. For example, β2 can be the ratio of L to R. In this way, the rear concave surface 131 can be matched with the flow velocity in the middle of the impeller 120 of the centrifugal fan, further improving the impact of the air flow at the air outlet 111 on the volute tongue 130, and reducing the noise generated at the volute tongue of the fan housing 100 when the range hood is in use.

[0076] The front profile line 135 on the volute tongue 130 is the profile line obtained by rotating the prototype line 136 around the axis of the impeller 120 by an angle of β3, and β3 is greater than or equal to 0.5 times the ratio of L to R, and at the same time, β3 is less than or equal to the value of β1. That is to say, the value range of β3 is between 0.5 times the ratio of L to R and the value of β1. For example, when β1 is the ratio of L to R, β3 can also be the ratio of L to R. In this way, the front concave surface 132 can be matched with the flow velocity at the front end of the impeller 120 of the centrifugal fan, further improving the impact of the air flow at the air outlet 111 on the volute tongue 130, and reducing the noise generated at the volute tongue of the fan housing 100 when the range hood is in use.

[0077] When the volute tongue 130 provided in this application is working, the air flow in the middle of the volute 100 will pass through the median line of the volute tongue 130, the air flow at the rear end of the volute 100 will pass through the rear concave surface of the volute tongue 130, and the air flow at the front end of the volute 100 will pass through the front concave surface of the volute tongue 130. By performing eccentric processing on the front concave surface 132 and the rear concave surface 131 of the volute tongue 130, in this way, the generation of eddy currents can be reduced, thereby reducing noise. It helps the fan to achieve higher air volume and air pressure while minimizing noise. And the eccentric processing of the concave surface of the volute tongue 130 can reduce the resistance suffered by the air flow during the flowing process, thereby making the flow channel larger. Performing eccentric processing on the volute tongue 130 can optimize the air flow direction and make the air flow more uniform. This can not only improve the working efficiency of the fan, but also reduce energy consumption. The optimized air flow path also helps to reduce the vibration of the machine, thereby improving the stability and service life of the fan.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the present application, rather than limiting the present application. Although the present application has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present application do not depart from the spirit and scope of the technical solutions of the present application, and should all be covered by the scope of the claims of the present application.

Claims

1. A volute, characterized in that, it includes: a housing having an air outlet; an impeller installed in the housing, the radius of the impeller being R, the impeller having a plurality of blades, and the gap between any two adjacent blades at the air outlet end being L; a volute tongue installed at the air outlet, the volute tongue having a rear concave surface and a front concave surface connected in the length direction, both the rear concave surface and the front concave surface facing the air outlet; one end of the rear concave surface is a rear profile line, the other end of the rear concave surface is connected to one end of the front concave surface, the connection line between the rear concave surface and the front concave surface is a middle profile line, and the other end of the front concave surface is a front profile line, a prototype line is provided on the volute tongue, and the front profile line, the rear profile line and the middle profile line are obtained by rotating and stretching the prototype line around the axis of the impeller. On the projection of the end face in the length direction of the volute tongue, the rear profile line, the front profile line, the prototype line and the middle profile line are sequentially spaced apart in the circumferential direction of the impeller; the rotation angle between the rear profile line and the prototype line around the axis of the impeller is β1, and 0.5L / R ≤ β1 ≤ 2L / R.

2. The volute according to claim 1, characterized in that, the rotation angle between the middle profile line and the prototype line around the axis of the impeller is β2, and 0.5L / R ≤ β2 ≤ 1.5L / R.

3. The volute according to claim 2, characterized in that, the rotation angle between the front profile line and the prototype line around the axis of the impeller is β3, and 0.5L / R ≤ β3 ≤ β1 ≤ 2L / R.

4. The volute according to claim 3, characterized in that, the height of the impeller is D, and the distance between the middle disk of the impeller and the middle profile line is L1, where L1 ≤ 0.1D.

5. The volute according to claim 1, characterized in that, the projection of the rear concave surface on the plane where the air outlet is located is a first curve, the projection of the front concave surface on the plane where the air outlet is located is a second curve, and the curvature of the first curve is greater than or equal to the curvature of the second curve.

6. The volute according to claim 1, characterized in that, the outer surface of the volute tongue further includes: a plane, both the rear concave surface and the front concave surface are connected to one side of the plane; a rear end face, the rear end face is connected to the rear concave surface, and the connection line between the rear end face and the rear concave surface is a rear profile line; a front end face, the rear end face and the front end face are the end faces in the length direction of the volute tongue, the front end face is connected to the front concave surface, and the connection line between the front end face and the front concave surface is a front profile line.

7. The volute according to claim 6, characterized in that, the housing includes: a first plate body connected to the rear end face; a second plate body disposed opposite to the first plate body and connected to the front end face; a surrounding plate, the surrounding plate, the first plate body and the second plate body together form an accommodation space, the impeller is installed in the accommodation space, and a plurality of the blades are arranged circumferentially in the accommodation space.

8. The volute according to claim 7, It is characterized in that the surrounding plate is cylindrical, and the plane is tangent to the circumference of the surrounding plate.

9. An oil fume suction machine It is characterized in that comprising: a volute, the volute being the volute according to any one of claims 1-8; a box body, wherein an air duct is provided in the box body, and the volute is arranged in the air duct.

10. A volute tongue It is characterized in that the volute tongue is installed at the air outlet of the volute, and the volute tongue has a rear concave surface and a front concave surface connected in the length direction, and both the rear concave surface and the front concave surface face the air outlet; one end of the rear concave surface is a rear profile line, the other end of the rear concave surface is connected to one end of the front concave surface, the connecting line between the rear concave surface and the front concave surface is a middle profile line, and the other end of the front concave surface is a front profile line. A prototype line is provided on the volute tongue, and the front profile line, the rear profile line and the middle profile line are obtained by rotating and stretching the prototype line around the center of the impeller. On the projection of the end surface in the length direction of the volute tongue, the rear profile line, the front profile line, the prototype line and the middle profile line are sequentially spaced apart along the circumferential direction of the impeller. The rotation angle between the rear profile line and the prototype line around the axis of the impeller is β1, and 0.5L / R ≤ β1 ≤ 2L / R; the rotation angle between the middle profile line and the prototype line around the axis of the impeller is β2, and 0.5L / R ≤ β2 ≤ 1.5L / R; the rotation angle between the front profile line and the prototype line around the axis of the impeller is β3, and 0.5L / R ≤ β3 ≤ β1 ≤ 2L / R.

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