Design method of volute, fan and extractor hood

Abstract

The present application relates to the technical field of volute design, and particularly relates to a volute design method, a fan and a range hood. The volute comprises a first end plate, a second end plate and a surrounding plate, the edges of the surrounding plate in the width direction are connected with the first end plate and the second end plate respectively, and the design method comprises the following steps: dividing the surrounding plate into a plurality of basic element structures from the volute tongue of the volute along the spiral expansion direction of the volute based on a preset circumferential angle; drawing the middle section curve and the edge section curve of the radial cross section of the basic element structure, wherein the edge section curve is a first circular arc curve, and the radius of the first circular arc curve corresponding to the basic element structure gradually increases from the volute tongue of the volute along the spiral expansion direction of the volute; and designing the volute according to the middle section curve and the edge section curve of the basic element structure. The volute design method provided by the present application can optimize the aerodynamic performance of the airflow in the volute without invading the flow space of the main flow area of the volute, thereby effectively improving the noise problem of the volute.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of volute design, and particularly relates to a design method of a volute, a fan and a range hood. BACKGROUND

[0002] When a kitchen range hood using a built-in centrifugal fan is used, the volute of the centrifugal fan has a very obvious dynamic and static interference phenomenon between the outlet airflow of the impeller and the volute wall in the actual operation process. This interference will cause larger vortex noise and rotating noise, thereby affecting the user experience.

[0003] In the related art, in order to improve the noise problem of the volute, the radial section profile is generally optimized. However, due to the design of the centrifugal axial inlet and radial outlet, most of the airflow cannot complete 90° deformation due to the inertia effect after entering the impeller. At this time, there is a large angle of attack between the airflow and the impeller, which occupies the main flow space of the airflow in the volute, causing the airflow to flow disorderly, and thereby forming a larger noise. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, the first object of the present application is to provide a design method of a volute, which can optimize the aerodynamic performance of the airflow in the volute without occupying the flow space of the main flow area of the volute, thereby improving the noise problem of the volute.

[0005] According to the design method of the volute, the volute includes a first end plate, a second end plate and a surrounding plate, the edges of the surrounding plate in the width direction are connected with the first end plate and the second end plate respectively, and the design method includes: dividing the surrounding plate into a plurality of primitive structures from the volute tongue of the volute along the spiral expansion direction of the volute based on a preset circumferential angle; drawing the middle section profile and the edge section profile of the radial section of the primitive structure in the width direction, wherein the edge section profile is a first circular arc profile, and the radius of the first circular arc profile corresponding to the primitive structure gradually increases from the volute tongue of the volute along the spiral expansion direction of the volute; designing the volute according to the middle section profile and the edge section profile of the primitive structure, wherein the volute has an impeller coaxially installed therein, an auxiliary circular profile is set based on the outer diameter of the impeller, the maximum distance of the auxiliary circular profile extending outward along the diameter direction to the middle section profile of the corresponding primitive structure is greater than or equal to the height of the primitive profile multiplied by a preset multiple, and the minimum value of the preset multiple is two, and the primitive profile is the profile corresponding to the section of the primitive structure in the width direction formed by the middle section profile and the edge section profile.

[0006] The design method of the volute according to the embodiment of the present application further comprises: limiting the ratio relationship between the radius of the first circular-arc profile and the width of the volute through a first preset ratio range and a second preset ratio range, wherein the first preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the first base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the second preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the last base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the ratio in the first preset ratio range is smaller than the ratio in the second preset ratio range.

[0007] The design method of the volute according to the embodiment of the present application further comprises: limiting the ratio relationship between the radius of the first circular-arc profile and the width of the volute through a first preset ratio range and a second preset ratio range, wherein the first preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the first base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the second preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the last base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the ratio in the first preset ratio range is smaller than the ratio in the second preset ratio range.

[0008] The design method of the volute according to the embodiment of the present application further comprises: limiting the ratio relationship between the radius of the first circular-arc profile and the width of the volute through a first preset ratio range and a second preset ratio range, wherein the first preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the first base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the second preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the last base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the ratio in the first preset ratio range is smaller than the ratio in the second preset ratio range.

[0009] The design method of the volute according to the embodiment of the present application further comprises: limiting the ratio relationship between the radius of the first circular-arc profile and the width of the volute through a first preset ratio range and a second preset ratio range, wherein the first preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the first base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the second preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the last base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the ratio in the first preset ratio range is smaller than the ratio in the second preset ratio range.

[0010] The design method of the volute according to the embodiment of the present application further comprises: limiting the ratio relationship between the radius of the first circular-arc profile and the width of the volute through a first preset ratio range and a second preset ratio range, wherein the first preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the first base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the second preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the last base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the ratio in the first preset ratio range is smaller than the ratio in the second preset ratio range.

[0011] The design method of the volute according to the embodiment of the present application further comprises: limiting the ratio relationship between the radius of the first circular-arc profile and the width of the volute through a first preset ratio range and a second preset ratio range, wherein the first preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the first base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the second preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the last base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the ratio in the first preset ratio range is smaller than the ratio in the second preset ratio range.

[0012] The design method of the volute according to the embodiment of the present application further comprises: limiting the ratio relationship between the radius of the first circular-arc profile and the width of the volute through a first preset ratio range and a second preset ratio range, wherein the first preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the first base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the second preset ratio range is used to limit the ratio of the radius of the first circular-arc profile to the width corresponding to the last base element structure arranged along the spiral expanding direction of the volute from the volute tongue, and the ratio in the first preset ratio range is smaller than the ratio in the second preset ratio range.

[0013] The design method of the volute according to the embodiment of the present application forms a first line segment between a first base element structure close to an end point of a volute tongue and a midpoint of an impeller, forms a second line segment between an end of the volute tongue away from an air outlet of the volute and the midpoint of the impeller, and the included angle between the first line segment and the second line segment is within a preset angle range.

[0014] The design method of the volute according to the embodiment of the present application has the preset angle range of [0°, 10°].

[0015] The design method of the volute according to the embodiment of the present application has the preset circumferential angle range of [15°, 100°].

[0016] The design method of the volute according to the embodiment of the present application divides the volute tongue of the volute into a plurality of base element structures according to the preset angle in the spiral expansion direction, further determines the middle section profile and the edge section profile in the width direction of the radial section of the base element structure, and designs the shape of the volute according to the middle section profile and the edge section profile, so that the airflow entering the volute has uniform flow velocity at the four connection areas of the volute shell plate, the first end plate and the second end plate, and further has better flowability in the volute, thereby improving the noise problem of the volute fan.

[0017] To achieve the above-mentioned purpose, the second aspect of the present application provides a fan, which comprises the volute designed by the design method of the volute of the first aspect, and has the beneficial effects corresponding to the volute designed by the design method of the volute.

[0018] To achieve the above-mentioned purpose, the third aspect of the present application provides an extractor hood, which comprises the fan of the second aspect, and has the beneficial effects corresponding to the fan.

[0019] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The flow chart of the design method of the volute provided by the embodiment of the present application;

[0021] Figure 2 The structural schematic diagram of the volute provided by the embodiment of the present application;

[0022] Figure 3 The schematic diagram of the radial section of a base element structure provided by the embodiment of the present application;

[0023] Figure 4 The schematic diagram of the radial section of another base element structure provided by the embodiment of the present application;

[0024] Figure 5A schematic diagram of a radial section of another kind of basic structure provided by an embodiment of the present application;

[0025] Figure 6 A schematic diagram of an auxiliary circular profile provided by an embodiment of the present application.

[0026] Reference signs: 10-first end plate; 20-second end plate; 30-enclosure plate; 40-volute tongue; 50-impeller; 60-air outlet; 70-auxiliary circular profile. DETAILED DESCRIPTION

[0027] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar notations used throughout the drawings and the specification denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0028] A design method of a volute of an embodiment of the present application is described below with reference to the accompanying drawings.

[0029] Reference Figure 1 A flowchart of the design method of the volute of an embodiment of the present application is provided.

[0030] In step S101, the enclosure plate 30 is divided into a plurality of basic structures from the volute tongue 40 of the volute along the spiral expansion direction of the volute based on a preset circumferential angle.

[0031] In step S102, a middle section profile and an edge section profile of the radial section of the basic structure are drawn, wherein the edge section profile is a first circular arc profile, and the radius of the first circular arc profile corresponding to the basic structure gradually increases from the volute tongue 40 of the volute along the spiral expansion direction of the volute.

[0032] In step S103, the volute is designed according to the middle section profile and the edge section profile of the basic structure.

[0033] Specifically, referring to Figure 2 A schematic diagram of the structure of the volute provided by an embodiment of the present application is shown in FIG. 1. The volute includes a first end plate 10, a second end plate 20, and an enclosure plate 30. When the volute is placed horizontally, the first end plate 10 can be an upper end plate, and the second end plate 20 can be a lower end plate. Both the first end plate 10 and the second end plate 20 are planar plates for limiting the overall shape of the volute. The edges of the enclosure plate 30 in the width direction (i.e., the axial direction of the volute) are connected to the first end plate 10 and the second end plate 20, respectively. The first end plate 10, the second end plate 20, and the enclosure plate 30 together constitute the overall external structure of the volute.

[0034] The volute tongue 40 profile line and the volute tongue 40 gap have a great influence on the aerodynamic noise of the fan. Without changing the structure of the volute tongue 40, the surrounding plate 30 is divided into multiple element structures along the spiral expansion direction of the volute based on a preset circumferential angle starting from the volute tongue 40 of the volute. The number of element structures is greater than or equal to 3. It can be understood that the more the number of element structures, the less the turbulence generated by the flow of air in the volute. However, the manufacturing process and assembly process of the volute will be more complex, and the manufacturing cost will also increase accordingly. The fewer the number of element structures, the more turbulence generated by the flow of air in the volute. However, the manufacturing process and assembly process of the volute will be relatively simple, and the manufacturing cost will also be relatively low. Therefore, the specific number of element structures can be determined according to application scenarios, application experience, etc., and is not limited here.

[0035] The radial cross-sectional part of the element structure divided on the volute is shown in Figure 3 The middle section profile line BC and the edge section profile line AB / CD are drawn in the width direction of the section, and the final structure of the volute is determined according to the drawn middle section profile line and edge section profile line.

[0036] The edge section profile line is the connecting edge of the surrounding plate 30 and the first end plate 10 and the second end plate 20, which needs to be set as a first circular arc profile line to make the surrounding plate 30 and the first end plate 10 and the second end plate 20 have a smooth transition. At the same time, since the air flow in the volute flow passage can continuously converge and increase along the circumferential direction, the air flow is larger near the volute outlet, so the radius of the first circular arc profile line corresponding to the element structure needs to be gradually increased from the volute tongue 40 along the spiral expansion direction of the volute to suppress the expansion of the low-speed area of the air flow in the volute and suppress the diffusion of the high-turbulent energy area to reduce the intensity of the pulsation, thereby reducing the aerodynamic noise generated by the volute.

[0037] It should be noted that, Figure 3 Ri i3 represents the radius of the first circular arc profile line in the i-th element structure.

[0038] As an optional embodiment, the preset circumferential angle is in the range of [15°, 100°].

[0039] Specifically, the preset circumferential angle needs to be greater than or equal to 15° to avoid the structure of the volute tongue 40 when determining the element structure. At the same time, the preset circumferential angle needs to be less than or equal to 100° to make the setting of the element structure have the maximum benefit and the optimal manufacturing cost.

[0040] As an optional embodiment, the design method further comprises: limiting the ratio between the radius of the first circular-arc profile and the width of the volute by a first preset ratio range and a second preset ratio range, wherein the first preset ratio range is used to limit the ratio between the radius of the first circular-arc profile and the width of the volute corresponding to the first base element structure arranged along the spiral expanding direction of the volute from the volute tongue 40, and the second preset ratio range is used to limit the ratio between the radius of the first circular-arc profile and the width of the volute corresponding to the last base element structure arranged along the spiral expanding direction of the volute from the volute tongue 40, and the ratio in the first preset ratio range is smaller than the ratio in the second preset ratio range.

[0041] Specifically, the ratio between the radius of the first circular-arc profile and the width of the volute can further inhibit the expansion of the airflow and the intensity of the pulsation, thereby inhibiting the generation of the aerodynamic noise, wherein the ratio between the radius of the first circular-arc profile and the width of the volute comprises a first preset ratio range and a second preset ratio range, the first preset ratio range is used to limit the ratio between the radius of the first circular-arc profile and the width of the volute corresponding to the first base element structure arranged along the spiral expanding direction of the volute from the volute tongue 40, and the second preset ratio range is used to limit the ratio between the radius of the first circular-arc profile and the width of the volute corresponding to the last base element structure arranged along the spiral expanding direction of the volute from the volute tongue 40.

[0042] It should be noted that the ratio in the first preset ratio range is smaller than the ratio in the second preset ratio range, in the embodiment of the present application, the first preset ratio range is preferably not less than 0.0307 and not more than 0.0376, and the second preset ratio range is preferably not less than 0.148 and not more than 0.181.

[0043] Taking the example that the surrounding plate 30 has 10 base element structures, the ratio between the radius of the first circular-arc profile and the width of the volute is shown in Table 1:

[0044] Table 1

[0045]

[0046] wherein R 13 represents the radius of the first circular-arc profile in the first base element structure, R 23 represents the radius of the first circular-arc profile in the second base element structure, and so on, R 103 represents the radius of the first circular-arc profile in the tenth base element structure, and H represents the width of the volute.

[0047] As an optional embodiment, the radial section of the base element structure is provided with an auxiliary horizontal profile in the width direction, the intermediate segment profile is composed of at least one line segment, and the intermediate segment profile and the edge segment profile are smoothly transitioned.

[0048] Specifically, the radial section of the elementary structure is provided with an auxiliary horizontal line in the width direction (as shown in Figure 3 E i F i indicates the i-th elementary structure), the auxiliary horizontal line is used to determine the geometric shape of the radial section of the elementary structure to make the flow state of the airflow in the volute meet the expectation, the middle section line in the width direction is composed of at least one line segment, and the line segment can be a straight line or a curve. In order to make the shape of the volute surrounding plate 30 smooth and the airflow in the volute stable, the connection between the middle section line and the edge section line needs to be smoothly transitioned.

[0049] As an optional embodiment, when the middle section line is composed of one line segment, the middle section line is a horizontal line or a second arc line.

[0050] As an optional embodiment, when the middle section line is a horizontal line, the middle section line partially coincides with the auxiliary horizontal line.

[0051] Specifically, when the middle section line is composed of one line segment, the middle section line can be a second arc line as shown in Figure 3 The middle section line can also be a horizontal line as shown in Figure 4 At this time, the horizontal line partially coincides with the auxiliary horizontal line, and the horizontal line needs to be tangent to the edge section line to make the edge section line smoothly transitioned with the middle section line. The horizontal middle section line can facilitate the machining of the volute mold, reduce the manufacturing process difficulty and manufacturing cost, and retain the arc of the edge section line to make the speed suppression and vortex suppression of the connection area between the first end plate 10 and the second end plate 20 and the surrounding plate 30.

[0052] As an optional embodiment, when the middle section line is a second arc line, the radius of the second arc line corresponding to the elementary structure gradually decreases from the volute tongue 40 of the volute in the spiral expansion direction of the volute.

[0053] As an optional embodiment, the design method further comprises: limiting the ratio relationship between the radius of the second arc line and the width of the volute through a third preset ratio range and a fourth preset ratio range, wherein the third preset ratio range is used to limit the ratio of the radius of the second arc line corresponding to the first elementary structure arranged from the volute tongue 40 of the volute in the spiral expansion direction of the volute to the width, and the fourth preset ratio range is used to limit the ratio of the radius of the second arc line corresponding to the last elementary structure arranged from the volute tongue 40 of the volute in the spiral expansion direction of the volute to the width, and the ratio in the third preset ratio range is greater than the ratio in the fourth preset ratio range.

[0054] Specifically, as shown in Figure 3As shown, when the intermediate segmental line is the second circular-arc segmental line, the radius of the second circular-arc segmental line on the radial cross section of the plurality of base element structures starts from the volute tongue 40 of the volute, and sequentially decreases along the expanding direction of the volute spiral, and meanwhile, there is a ratio relationship between the radius of the second circular-arc segmental line and the width of the volute, which can further inhibit the expansion of the airflow and the intensity of the pulsation, thereby inhibiting the generation of aerodynamic noise. The ratio relationship between the radius of the second circular-arc segmental line and the width of the volute includes a third preset ratio range and a fourth preset ratio range, the third preset ratio range is used to limit the ratio between the radius of the second circular-arc segmental line corresponding to the first base element structure arranged along the expanding direction of the volute spiral starting from the volute tongue 40 and the width, and the fourth preset ratio range is used to limit the ratio between the radius of the second circular-arc segmental line corresponding to the last base element structure arranged along the expanding direction of the volute spiral starting from the volute tongue 40 and the width.

[0055] It should be noted that, Figure 3 Ri i4 represents the radius of the second circular-arc segmental line in the i-th base element structure.

[0056] It should be noted that the ratio in the third preset ratio range is greater than the ratio in the fourth preset ratio range, and in the embodiment of the present application, the third preset ratio range is preferably not less than 3.351 and not greater than 4.095, and the fourth preset ratio range is preferably not less than 0.759 and not greater than 0.928.

[0057] Taking the example that the enclosing plate 30 has 10 base element structures, the ratio relationship between the radius of the second circular-arc segmental line and the width of the volute is shown in Table 2:

[0058] Table 2

[0059]

[0060] wherein, Ri 14 represents the radius of the second circular-arc segmental line in the first base element structure, Ri 24 represents the radius of the second circular-arc segmental line in the second base element structure, and so on, Ri 104 represents the radius of the second circular-arc segmental line in the tenth base element structure, and H also represents the width of the volute.

[0061] It should be noted that the first circular arc profile and the second circular arc profile of the radial section of the volute base structure need to be debugged many times according to the axial position of the circular arc, so that the gas flow in the volute internal flow passage is in the optimal flow route. The radius of the first circular arc profile and the radius of the second circular arc profile are limited to the values shown in Tables 1 and 2 through the width of the volute, mainly considering that the gas flow in the volute flow passage continuously converges and grows along the circumference, and as it continuously approaches the outlet of the volute, the reduction of the circular arc curvature can limit the expansion of the low-speed area, inhibit the diffusion of the high-turbulent energy area, thereby reducing the pressure pulsation intensity and reducing the noise generated by the volute.

[0062] Reference Figure 5 Another schematic diagram of the radial section of the base structure provided by the embodiment of the present application.

[0063] As an optional embodiment, when the intermediate segment profile is composed of two line segments, the intermediate segment profile includes a first sub-profile and a second sub-profile, the first sub-profile and the second sub-profile are connected and have a connection point, and the connection point is located at the midpoint of the auxiliary horizontal profile.

[0064] Specifically, the intermediate segment profile can also be composed of two line segments, at this time the intermediate segment profile includes a first sub-profile and a second sub-profile, the midpoint P of the auxiliary horizontal line is set as the connection point of the first sub-profile and the second sub-profile, the first sub-profile and the second sub-profile are symmetrical about the vertical line passing through the midpoint, and the gas flow in the volute can uniformly diffuse to both sides under the shape of the coaming 30 formed by the first sub-profile and the second sub-profile, avoiding the shape of the volute gas flow passage to deviate and thereby causing uneven gas flow velocity and pressure distribution, while also greatly simplifying the processing mold of the volute.

[0065] As an optional embodiment, a impeller 50 is coaxially installed in the volute, an auxiliary circular profile 70 is set based on the outer diameter of the impeller 50, and the maximum distance of the auxiliary circular profile 70 extending outward along the diameter direction to the intermediate segment profile of the corresponding base structure is greater than or equal to a preset multiple of the height of the base profile, wherein the minimum value of the preset multiple is two, and the base profile is the profile corresponding in the width direction of the base structure composed of the intermediate segment profile and the edge segment profile.

[0066] Specifically, a impeller 50 is coaxially installed in the volute, when the impeller 50 rotates, the blades on the impeller 50 can make the gas in the volute rotate and generate a very high peripheral speed, so that the gas flow can be guided from the inlet at the center of the impeller 50 to the outer edge of the impeller 50 under the action of centrifugal force, and then flow to the outlet of the volute along the shape of the volute flow passage.

[0067] The auxiliary circular profile 70 is set based on the outer diameter of the impeller 50, for example, Figure 6As shown, the section of the base element structure in the width direction corresponds to a base element line, and the maximum distance of the auxiliary circle line 70 along the diameter direction needs to be greater than or equal to the height of the base element line of the preset multiple, that is wherein, is the maximum distance of the auxiliary circle line 70 corresponding to the i-th base element structure along the diameter direction, is the height of the base element line corresponding to the i-th base element structure, for example, n1m1 is the maximum distance of the auxiliary circle line 70 corresponding to the first base element structure along the diameter direction, n1r1 is the height of the base element line corresponding to the first base element structure, and other n2-n 10 , m2-m 10 and r2-r 10 For details, please refer to the description of n1m1 and n1r1 above, which will not be repeated here. It should be noted that n0m0 and n0r0 can be used as the starting point of dividing the first base element structure.

[0068] It should be noted that, is a preset multiple, and the minimum value of the preset multiple is two, so as to avoid the construction of the base element line invading the flow space of the main flow area of the volute. As an optional embodiment, the endpoint of the volute tongue 40 close to the midpoint of the impeller 50 forms a first line segment, and the endpoint of the volute tongue 40 away from the air outlet 60 of the volute forms a second line segment, and the included angle between the first line segment and the second line segment is within a preset angle range.

[0069] As an optional embodiment, the preset angle range is [0°, 10°].

[0070] Specifically, the second line segment formed by the endpoint of the volute tongue 40 away from the air outlet 60 of the volute and the midpoint of the impeller 50 has a preset angle with the first line segment formed by the endpoint of the volute tongue 40 close to the midpoint of the impeller 50, and the preset angle is within the range of [0°, 10°]. By designing the preset angle, not only can the structure of the volute tongue 40 be changed to avoid the need to re-open the mold and increase the manufacturing cost of the volute, but also the collision between the airflow at the starting end in the volute flow passage and the volute tongue 40 area can be effectively reduced, thereby reducing the operating noise.

[0071] According to the design method of the volute according to the embodiment of the present application, the volute tongue of the volute is divided into a plurality of base element structures along the spiral expansion direction according to the preset angle, the intermediate segment line and the edge segment line are further determined in the width direction of the radial section of the base element structure, and the shape of the volute is regularly designed according to the intermediate segment line and the edge segment line, so that the airflow entering the volute has uniform flow velocity at the four connection areas of the volute panel, the first end plate and the second end plate, and further makes the airflow have better flowability in the volute, thereby improving the noise problem of the volute fan.

[0072] Based on the same concept, corresponding to the design method of the volute described above, the application further provides a fan, which applies the volute manufactured by the design method of the volute described above, and has the beneficial effects corresponding to the design method of the volute, which will not be repeated here.

[0073] Based on the same concept, corresponding to the fan described above, the application further provides an extractor hood, which applies the fan described above, and has the beneficial effects corresponding to the fan, which will not be repeated here.

[0074] In addition, other configurations and functions of the volute, the fan and the extractor hood in the embodiments of the application are known to those skilled in the art, and to reduce redundancy, they will not be repeated here.

[0075] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a list of executable instructions for implementing logic functions, which can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus or device, such as a computer-based system, a system including a processor or other system that can fetch instructions from an instruction execution system, apparatus or device and execute the instructions, or in conjunction with these instruction execution systems, apparatus or devices. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transport programs for use by or in connection with an instruction execution system, apparatus or device, or in conjunction with these instruction execution systems, apparatus or devices. More specific examples (non-exhaustive list) of computer-readable medium include the following: electrical connections having one or more wires (electronic devices), portable computer diskette (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CD ROM). In addition, the computer-readable medium can even be paper or other suitable medium on which the program can be printed, as the program can be electronically obtained, for example, by optical scanning of the paper or other medium, followed by editing, interpreting or otherwise processing, if necessary, in other suitable ways, to be electronically obtained and then stored in the computer memory.

[0076] It should be understood that various aspects of the application can be implemented in hardware, software, firmware, or a combination of them. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following technologies, known in the art, or their combinations, can be used: discrete logic circuitry having logic gates for implementing logic functions upon an application of data signals, application-specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field-programmable gate arrays (FPGA), and the like.

[0077] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearance of the above terms in various places in the description are not necessarily intended to refer to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0078] In the description of the present application, it should be understood that the terms "midpoint", "width", "horizontal", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 a limitation of the present application.

[0079] In addition, the terms "first", "second", and the like used in the embodiments of the present application are only for the purpose of description, and can not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features referred to in the embodiments. Therefore, the features defined with "first", "second" and the like in the embodiments of the present application can explicitly or implicitly indicate that the embodiments include at least one of the features. In the description of the present application, the meaning of the word "plurality" is at least two or two or more, such as two, three, four, and the like, unless otherwise specifically limited in the embodiments.

[0080] In the present application, unless otherwise explicitly related or limited in the embodiments, the terms "connected", etc. appearing in the embodiments should be understood broadly, for example, the connection can be fixed connection, or detachable connection, or integrated, which can be understood, or mechanical connection, electrical connection, etc. Of course, it can also be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements, or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific implementation situation.

[0081] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and modifications to the above embodiments within the scope of the present application.

Claims

1. A method for designing a volute, characterized in that, The volute includes a first end plate, a second end plate, and a surrounding plate. The surrounding plate is connected to the first end plate and the second end plate respectively at its edges in the width direction. The design method includes: Based on a preset circumferential angle, the enclosure is divided into multiple basic structures from the volute tongue along the spiral expansion direction of the volute. Draw the radial cross-section of the basic structure in the width direction, including the middle section profile and the edge section profile, wherein the edge section profile is a first circular arc profile, and the radius of the first circular arc profile corresponding to the basic structure gradually increases from the volute tongue along the spiral expansion direction of the volute. The volute is designed based on the profile lines of the middle and edge segments of the basic structure. The impeller is coaxially mounted inside the volute. An auxiliary circular line is set based on the outer diameter of the impeller. The maximum distance from which the auxiliary circular line extends outward along the diameter direction to the middle section profile of the corresponding basic structure is greater than or equal to the height of the basic profile of a preset multiple. The minimum value of the preset multiple is two. The basic profile is the profile of the cross section of the basic structure composed of the middle section profile and the edge section profile in the width direction. The ratio between the radius of the first arc-shaped line and the width of the volute is limited by a first preset ratio range and a second preset ratio range. The first preset ratio range limits the ratio of the radius of the first arc-shaped line corresponding to the width of the first basic structure arranged from the volute tongue along the spiral expansion direction of the volute. The second preset ratio range limits the ratio of the radius of the first arc-shaped line corresponding to the width of the last basic structure arranged from the volute tongue along the spiral expansion direction of the volute. The ratio within the first preset ratio range is less than the ratio within the second preset ratio range. The endpoint of the first basic structure near the volute tongue forms a first line segment with the midpoint of the impeller. The end of the volute tongue away from the air outlet of the volute forms a second line segment with the midpoint of the impeller. The included angle between the first line segment and the second line segment is within a preset angle range. The radial section of the basic structure has an auxiliary horizontal profile in the width direction. The middle section profile is composed of at least one line segment, and the middle section profile and the edge section profile have a smooth transition.

2. The design method of the volute according to claim 1, characterized in that, When the intermediate section profile is composed of a single line segment, the intermediate section profile is either a horizontal profile or a second circular arc profile.

3. The design method of the volute according to claim 2, characterized in that, When the middle section profile is the horizontal profile, the middle section profile partially overlaps with the auxiliary horizontal profile.

4. The design method of the volute according to claim 2, characterized in that, When the middle section profile is the second circular arc profile, the radius of the second circular arc profile corresponding to the basic structure gradually decreases from the volute tongue along the spiral expansion direction of the volute.

5. The design method of the volute according to claim 4, characterized in that, The design method further includes: The ratio between the radius of the second arcuate line and the width of the volute is limited by a third preset ratio range and a fourth preset ratio range. The third preset ratio range is used to limit the ratio between the radius of the second arcuate line corresponding to the first basic structure arranged from the volute tongue along the spiral expansion direction of the volute and the width of the volute. The fourth preset ratio range is used to limit the ratio between the radius of the second arcuate line corresponding to the last basic structure arranged from the volute tongue along the spiral expansion direction of the volute and the width of the volute. The ratio in the third preset ratio range is greater than the ratio in the fourth preset ratio range.

6. The design method of the volute according to claim 1, characterized in that, When the intermediate section profile is composed of two line segments, the intermediate section profile includes a first sub-profile and a second sub-profile, the first sub-profile and the second sub-profile are connected and have a connection point, the connection point being located at the midpoint of the auxiliary horizontal profile.

7. The design method of the volute according to claim 1, characterized in that, The preset angle range is [0°, 10°].

8. The design method of the volute according to claim 1, characterized in that, The preset circumferential angle has a range of [15°, 100°].

9. A fan, characterized in that, It includes a volute, which is designed by the design method of any one of claims 1-8.

10. A range hood, characterized in that, Includes the fan as described in claim 9.

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