Fan volute with adjustable molded line and fan for testing

Abstract

The utility model relates to a molded line adjustable fan volute and a fan for testing, which can improve the performance of the fan and remarkably reduce the iteration time of design and the manufacturing cost. The fan volute with the adjustable molded line comprises a volute frame, the volute frame comprises a pair of end covers arranged at intervals, and each end cover is provided with an air inlet and a plurality of adjusting grooves formed around the air inlet; the volute annular wall comprises an elastic side wall movably arranged between the two end covers and a volute tongue fixedly arranged between the two end covers; one end of the elastic side wall is fixedly connected to the two end covers, so that an air outlet is defined by the elastic side wall and the volute tongue; the other end of the elastic side wall is wound in the volute tongue to form a winding drum; each adjusting assembly comprises an adjusting rod and fixed cover plates, wherein the adjusting rod is inserted into the opposite adjusting grooves in the two end covers in a sliding mode and abuts against the elastic side walls, and the fixed cover plates are connected with the two ends of the adjusting rod and located on the outer sides of the two end covers respectively. And the fixed cover plate extends outwards from the adjusting rod so as to always cover the adjusting groove during position adjustment.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to a fan volute with adjustable profile and a testing fan. Background Art

[0002] In the development and design process of range hoods, experimental testing of centrifugal fans plays a vital role, because this kind of testing of centrifugal fans can not only ensure that the fan performance meets specific requirements, but also help optimize the design, improve energy efficiency and reduce noise. Finally, through precise testing, engineers can verify and improve the design, thereby producing a more efficient and user-friendly range hood.

[0003] However, in the traditional centrifugal fan testing process, the design and manufacture of the volute structure faces a significant challenge. Specifically, whenever the test data reveals design deficiencies and a new design solution needs to be tried, engineers must process a brand new volute, which not only leads to a long waiting time for proofing, but also significantly increases the length of the test cycle, which in turn affects the product's time to market and significantly increases the development cost of the centrifugal fan. Especially in today's increasingly competitive market, such delays and cost increases may have a serious negative impact on the company's market position. Utility Model Content

[0004] Based on this, it is necessary to address the problems of long testing cycle and high development cost of the volute structure. The utility model provides a fan volute with adjustable profile and a test fan, which can improve the fan performance and significantly reduce the design iteration time and manufacturing cost.

[0005] In one embodiment of the present application, the utility model provides a fan volute with adjustable profile, comprising:

[0006] The volute frame comprises a pair of end covers arranged at intervals, each of the end covers having an air inlet and a plurality of adjustment slots arranged around the air inlet;

[0007] The volute ring wall comprises an elastic side wall movably arranged between the two end covers and a volute tongue fixedly arranged between the two end covers; one end of the elastic side wall is fixedly connected to the two end covers to form an air outlet with the volute tongue; the other end of the elastic side wall is rolled up inside the volute tongue to form a reel; and

[0008] Multiple adjustment components, each of which includes an adjustment rod that is slidably inserted into the opposite adjustment grooves on the two end covers and abuts against the outer wall surface of the elastic side wall, and a fixed cover plate that is connected to both ends of the adjustment rod and is respectively located on the outside of the two end covers; the fixed cover plate extends outward from the adjustment rod to always cover the adjustment groove when the adjustment rod is adjusted along the adjustment groove.

[0009] According to one embodiment of the present application, the adjustment groove is a strip-shaped slide groove extending along the radial direction of the air inlet; the fixed cover plate is a runway-shaped baffle, and the long side of the runway-shaped baffle corresponds to the extension direction of the strip-shaped slide groove.

[0010] According to one embodiment of the present application, the profile-adjustable fan volute further includes a pair of sealing gaskets respectively located between the two end covers and the volute annular wall, and each of the sealing gaskets has an adjustment hole corresponding to the adjustment groove one by one.

[0011] According to one embodiment of the present application, the sealing gasket includes a flexible gasket body that provides the adjustment hole; the flexible gasket body is protruded from the inner wall surface of the end cover and extends along the elastic side wall to fill the gap between the end cover and the elastic side wall.

[0012] According to one embodiment of the present application, the sealing gasket further includes a flexible flange extending along an edge of the adjustment hole and extending from the flexible gasket body into the adjustment groove.

[0013] According to an embodiment of the present application, the adjusting rod is threadedly connected to the fixed cover plate; the diameter of the adjusting rod is larger than the width of the adjusting hole and smaller than the width of the adjusting slot.

[0014] According to an embodiment of the present application, the adjustment assembly further includes a buffer pad fixed to the adjustment rod and in contact with the elastic side wall, and a magnetic member located between the adjustment rod and the buffer pad and magnetically attracting the elastic side wall.

[0015] According to one embodiment of the present application, the adjustment rod has a notch groove for accommodating the buffer pad and the magnetic member; the bottom width of the notch groove is equal to the diameter of the adjustment rod; the sum of the thickness of the buffer pad and the magnetic member is less than the difference between the width of the adjustment hole and the radius of the adjustment rod.

[0016] According to one embodiment of the present application, the thickness of the flexible flange satisfies the relationship:

[0017]

[0018] In the formula: tm is the thickness of the flexible flange; d is the diameter of the adjustment rod; t is the sum of the thickness of the buffer pad and the magnetic member; dm is the width of the adjustment hole.

[0019] According to another aspect of the present application, according to an embodiment of the present application, a test fan is further provided, comprising:

[0020] Any of the above-mentioned adjustable profile fan volutes; and

[0021] An impeller is rotatably arranged on the profile-adjustable fan volute.

[0022] To summarize, the volute of the fan with adjustable profile of the present application, on the one hand, always covers the adjustment slot by the fixed cover plate of the adjustment assembly when the adjustment rod is adjusted along the adjustment slot for profile adjustment, thereby blocking the airflow in the volute from leaking toward the outside of the end cover through the adjustment slot; on the other hand, the gap between the end cover and the elastic side wall is blocked by the flexible pad body of the sealing gasket, thereby blocking the airflow in the volute from leaking outward through the gap between the end cover and the elastic side wall; at the same time, the gap between the adjustment rod and the side wall of the adjustment slot is filled by the flexible flange of the sealing gasket, thereby blocking the airflow in the volute from leaking toward the inside of the end cover through the adjustment slot bypassing the adjustment rod, so as to improve the air tightness of the volute of the fan with adjustable profile and ensure that the test can be carried out normally.

[0023] In addition, the fan volute with adjustable profile of the present application also reasonably designs the thickness of the flexible flange to solve the airtightness problem while ensuring the mobility of the adjustment rod so as to smoothly adjust the profile of the annular wall.

[0024] After testing and analysis, if it is found that the previous design has deficiencies and a new design scheme needs to be tried, it is only necessary to adjust the fixed position of the adjustment component on the corresponding adjustment groove according to the needs of the new design scheme, so as to achieve the profile adjustment of the volute ring wall. There is no need for engineers to process a completely new volute, which helps to significantly shorten the length of the test cycle, reduce development costs, and avoid affecting the product's time to market; especially in today's increasingly competitive market, the significant shortening of the test cycle and the significant reduction in costs will have a positive impact on the company's market position. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional schematic diagram of a fan volute with adjustable profile according to an embodiment of the present application;

[0026] Figure 2 An exploded schematic diagram of a fan volute with adjustable profile according to the above embodiment of the present application is shown;

[0027] Figure 3An enlarged schematic diagram of an adjustment component in a volute of a fan with adjustable profile in the above embodiment of the present application is shown;

[0028] Figure 4 A three-dimensional cross-sectional schematic diagram of a fan volute with adjustable profile according to the above embodiment of the present application is shown;

[0029] Figure 5 A schematic plan cross-sectional view of a fan volute with adjustable profile according to the above embodiment of the present application is shown;

[0030] Figure 6 A schematic cross-sectional view of the adjustable profile fan volute at the end cover of the above embodiment of the present application is shown.

[0031] Explanation of the main component symbols: 1. Fan volute with adjustable profile; 10. Volute frame; 11. End cover; 111. Air inlet; 112. Adjustment slot; 20. Volute ring wall; 21. Elastic side wall; 210. Reel; 22. Volute tongue; 221. Winding chamber; 222. Guide hole; 23. Spring; 30. Adjustment assembly; 31. Adjustment rod; 310. Notch groove; 32. Fixed cover plate; 33. Buffer pad; 34. Magnetic part; 40. Sealing pad; 400. Adjustment hole; 41. Flexible pad body; 42. Flexible flange.

[0032] The above main component symbols are combined with the accompanying drawings and specific implementation methods to further illustrate the present invention in detail. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0038] Considering that in the traditional centrifugal fan testing process, whenever the test data reveals design deficiencies and a new design solution needs to be tried, engineers must process a brand new volute, which not only leads to a long waiting time for proofing, but also significantly increases the length of the test cycle, thereby affecting the product's time to market and significantly increasing the development cost of the centrifugal fan. Therefore, the present application provides a fan volute with adjustable profile and a test fan, which can significantly reduce the design iteration time and manufacturing cost.

[0039] Specifically, refer to the attached Figures 1 to 6 As shown, one embodiment of the present application provides a test fan, which may include a profile-adjustable fan volute 1 and an impeller (not shown in the figure) rotatably disposed on the profile-adjustable fan volute 1, for performing an optimization test of a centrifugal fan. It is understood that the impeller of the present application may include, but is not limited to, a rotating shaft, a motor drivingly connected to the rotating shaft, and a plurality of blades arranged at intervals along the circumference of the rotating shaft, and the present application will not repeat them here.

[0040] More specifically, if Figures 1 to 4As shown, the profile-adjustable fan volute 1 may include a volute frame 10, a volute ring wall 20, and a plurality of adjustment components 30. The volute frame 10 includes a pair of end covers 11 arranged at intervals, each end cover 11 having an air inlet 111 and a plurality of adjustment slots 112 arranged around the air inlet 111. The volute ring wall 20 includes an elastic side wall 21 movably arranged between the two end covers 11 and a volute tongue 22 fixed between the two end covers 11; one end of the elastic side wall 21 is fixedly connected to the two end covers 11 to form an air outlet with the volute tongue 22; the other end of the elastic side wall 21 is rolled up inside the volute tongue 22 to form a reel 210. Each adjustment component 30 includes an adjustment rod 31 slidably inserted into the opposite adjustment slots 112 on the two end covers 11 and abutting against the outer wall surface of the elastic side wall 21 to adjust the profile of the volute ring wall 20. It is understandable that the elastic side wall 21 mentioned in the present application can be, but is not limited to, implemented as a metal coil or a plastic coil, and can be elastically deformed in the radial direction of the air inlet 111, and this application will not go into details.

[0041] It is worth noting that, in the process of testing with the test fan, each adjusting rod 31 can be fixed at the required position on the corresponding adjusting slot 112 according to the profile design requirements; at this time, the impeller rotates to increase the wind pressure in the volute, so that the elastic side wall 21 abuts against all the adjusting rods 31 under the action of the wind pressure, so as to ensure that the actual profile of the volute ring wall 20 is consistent with the designed profile; after testing and analysis, if it is found that the previous design has deficiencies and a new design scheme needs to be tried, it is only necessary to adjust the fixed position of the adjusting rod 31 on the corresponding adjusting slot 112 according to the new design scheme, so as to achieve the profile adjustment of the volute ring wall 20, without the need for engineers to process a completely new volute, which helps to significantly shorten the duration of the test cycle, reduce development costs, and avoid affecting the time to market of the product; especially in today's increasingly fierce market competition, the significant shortening of the test cycle and the significant reduction in costs will have a positive impact on the company's market position.

[0042] In addition, since the other end of the elastic side wall 21 is rolled up in the volute tongue 22, the circumference of the volute ring wall 20 can be adjusted to meet the needs of different profile design schemes. In other words, when the profile circumference in the profile design scheme becomes shorter, the elastic side wall 21 can be partially rolled up in the volute tongue 22 to shorten the circumference of the volute ring wall 20; when the profile circumference in the profile design scheme becomes longer, the elastic side wall 21 can be partially pulled out from the volute tongue 22 to lengthen the circumference of the volute ring wall 20, greatly increasing the flexibility of adjusting the profile design scheme.

[0043] According to the above embodiments of the present application, Figure 2 and Figure 5As shown, the volute ring wall 20 may further include a spring spring 23 disposed between the reel 210 and the volute tongue 22, which is used to apply a winding torque to the reel 210, so that the other end of the elastic side wall 21 can be automatically wound in the volute tongue 22 under the action of the spring spring 23, so as to ensure that the elastic side wall 21 is always in an automatically tensioned state. In this way, when the fixed position of the adjustment rod 31 is adjusted to adjust the ring wall profile, if the ring wall circumference increases, the reel 210 will partially stretch under its own elastic action and the action of the wind pressure in the volute to extend the volute tongue 22 and abut against the adjustment rod 31; if the ring wall circumference decreases, the excessively long part of the elastic side wall 21 will automatically roll back the volute tongue 22 under the action of the spring spring 23, and the volute ring wall 20 can still abut against the adjustment rod 31 under its own elastic action and the action of the wind pressure in the volute, thereby realizing the controllable adjustment of the ring wall profile.

[0044] It is worth noting that the volute tongue 22 fixedly arranged between the two end covers 11 in the present application has at least two advantages: on the one hand, the arc structure of the volute tongue 22 itself can fit very well with the reel 210, and can provide support for the reel 210 while accommodating the reel 210; on the other hand, a slight deformation of the volute tongue 22 will have a great impact on the air performance of the centrifugal fan. If the volute tongue structure is adjusted, a more precise structure is required to achieve it. Therefore, the present application fixes the volute tongue 22 to reduce the impact of the volute tongue 22 on the test structure, so as to improve the accuracy of the profile test.

[0045] Alternatively, if Figure 2 and Figure 5 As shown, the volute tongue 22 of the present application may have a reeling cavity 221 for accommodating the reel 210 and a guide hole 222 communicating with the reeling cavity 221, and the other end of the elastic side wall 21 passes through the guide hole 222 to be reeled in the reeling cavity 221 of the volute tongue 22, so as to extend or retract into the reeling cavity 221 under the guidance of the guide hole 222. In this way, the elastic side wall 21 will generate friction with the hole wall of the guide hole 222 during the process of passing through the guide hole 222 and have a certain self-locking ability, thereby limiting the influence of the contraction force on the profile structure, which helps to improve the stability of the profile structure.

[0046] In addition, since the adjustment slot 112 passes through the end cover 11, the adjustment rod 31 slides along the adjustment slot 112 to adjust the fixed position, so the airflow in the volute will leak at the adjustment slot 112, which is easy to affect the accuracy of the test results and is not conducive to the normal function of the adjustable profile fan volute 1. In order to solve this problem, Figures 1 to 4As shown, the adjustment component 30 of the present application may further include a fixed cover plate 32 connected to both ends of the adjustment rod 31 and respectively located on the outside of the two end covers, and the fixed cover plate 32 extends outward from the adjustment rod 31 to always cover the adjustment groove 112 when the adjustment rod 31 is adjusted along the adjustment groove 112, so as to block the airflow in the volute from leaking through the adjustment groove 112 toward the outside of the end cover 11, thereby improving the accuracy of the test results.

[0047] For example, Figure 2 As shown, the adjustment groove 112 can be implemented as a strip-shaped slide groove extending along the radial direction of the air inlet 111, so as to shorten the length of the adjustment groove 112 as much as possible while meeting the volute profile adjustment requirements, which helps to reduce the size of the fixed cover plate 32.

[0048] Optionally, a plurality of adjustment grooves 112 may be arranged along a basic volute profile to reduce unnecessary slots, reduce the slot area on the end cover 11, and help reduce gas leakage. It is understood that the basic volute profile mentioned in the present application may be implemented as, but not limited to, a logarithmic spiral or an Archimedean spiral, etc., and the present application will not elaborate on this.

[0049] Alternatively, if Figures 1 to 3 As shown, the fixed cover plate 32 is implemented as a runway-shaped baffle, and the long side of the runway-shaped baffle corresponds to the extension direction of the strip slide groove, so as to ensure that the fixed cover plate 32 always covers the adjustment groove 112 while further reducing the material used for the fixed cover plate 32 and reducing the cost.

[0050] It is worth noting that although the fixed cover plate 32 always covers the adjustment slot 112 to reduce gas leakage to a certain extent, since the other end of the elastic side wall 21 needs to be rolled up in the volute tongue 22, in order to ensure the flexibility of the overall assembly on the elastic side wall 21 to adjust the position, the actual width of the elastic side wall 21 usually needs to be smaller than the distance between the two end covers 11, which will cause the airflow in the volute to leak from the gap between the elastic side wall 21 and the end cover 11. In order to solve this problem, Figures 1 to 5 As shown, the adjustable profile fan volute 1 of the present application may also include a pair of sealing gaskets 40 respectively located between the two end covers 11 and the volute annular wall 20; each sealing gasket 40 has an adjustment hole 400 corresponding to the adjustment groove 112, so as to fill the gap between the end cover 11 and the volute annular wall 20 while ensuring that the adjustment rod 31 is inserted into the adjustment groove 112 through the adjustment hole 400 to slide along the adjustment groove 112, thereby blocking the airflow in the volute from leaking from the gap between the volute annular wall 20 and the end cover 11.

[0051] Alternatively, if Figure 2 and Figure 4As shown, each sealing gasket 40 includes a flexible gasket body 41 that provides the adjustment hole 400. The flexible gasket body 41 is protruded from the inner wall surface of the end cover 11 and extends along the elastic side wall 21 to fill the gap between the end cover 11 and the elastic side wall 21, thereby reducing airflow leakage without affecting the movement of the elastic side wall 21, thereby meeting the needs of volute profile adjustment.

[0052] Alternatively, if Figure 2 , Figure 4 as well as Figure 6 As shown, the sealing gasket 40 further includes a flexible flange 42 extending along the edge of the adjustment hole 400 and extending from the flexible pad body 41 into the adjustment groove 112, so that the flexible pad body 41 of the sealing gasket 40 can be firmly fixed to the inner wall surface of the end cover 11 through the flexible flange 42 to prevent the flexible pad body 41 from shifting with the movement of the elastic side wall 21. At the same time, the flexible flange 42 can also fill the gap between the adjustment rod 31 and the side wall of the adjustment groove 112, blocking the airflow in the volute from bypassing the adjustment rod 31 through the adjustment groove 112 and leaking toward the inside of the end cover 11, that is, avoiding leakage around the column, further improving the air tightness of the adjustable profile fan volute 1, and ensuring that the test can be carried out normally.

[0053] Optionally, the diameter of the adjusting rod 31 is larger than the width of the adjusting hole 400 and smaller than the width of the adjusting groove 112, so that the flexible flange 42 can be squeezed between the adjusting rod 31 and the side wall of the adjusting groove 112. Not only can the flexible flange 42 better fill the gap between the adjusting rod 31 and the side wall of the adjusting groove 112, but the adjusting rod 31 can also be fixed in the adjusting groove 112 in an adjustable position to a certain extent through the elastic deformation of the flexible flange 42.

[0054] Optionally, the adjusting rod 31 is threadedly connected to the fixing cover plate 32 to be implemented as a screw nut. In this way, when the volute profile needs to be adjusted, the fixing cover plate 32 can be released by rotating it relative to the adjusting rod 31, and then when the adjusting rod 31 is slid to a desired position along the adjusting slot 112, the fixing cover plate 32 can be rotated in the opposite direction to achieve tightening, so that the adjusting rod 31 can be detachably positioned and fixed.

[0055] It is worth noting that since the surface of the adjusting rod 31 is usually an outward convex arc surface, and the surface of the elastic side wall 21 is an outward convex curved surface, if the elastic side wall 21 is in direct contact with the adjusting rod 31, the contact mode is implemented as a line contact, which will cause stress concentration, and it is easy to cause the part of the elastic side wall 21 in contact with the adjusting rod 31 to produce a concave deformation, resulting in a decrease in the smoothness of the volute ring wall profile, which in turn has an adverse effect on the accuracy of the test results. In order to solve this problem, Figures 3 to 6As shown, the adjustment assembly 30 of the present application may further include a buffer pad 33 fixed to the adjustment rod 31 and in contact with the elastic side wall 21. In this way, the contact area between the adjustment assembly 30 and the elastic side wall 21 can be increased through the flexible deformation of the buffer pad 33, which is convenient for reducing stress concentration and helping to improve the smoothness of the annular wall profile. It is understandable that the buffer pad 33 mentioned in the present application can be made of, but not limited to, a flexible material such as silicone or rubber.

[0056] In addition, when the profile of the annular wall of the adjustable profile fan volute 1 is switched from a small curvature scheme to a large curvature scheme, the elastic side wall 21 tends to maintain the original curvature; at this time, under the condition of a lower power gear, the wind pressure in the volute is small and may not be enough to make the elastic side wall 21 abut against the adjustment component 30, resulting in the annular wall profile not being adjusted in place, affecting the reliability of the test results. In order to solve this problem, Figures 3 to 6 As shown, the adjustment component 30 of the present application may further include a magnetic member 34 located between the adjustment rod 31 and the buffer pad 33 and magnetically attracting the elastic side wall 21, so that the elastic side wall 21 can be magnetically pulled by the magnetic member 34, so that the elastic side wall 21 can still abut against the buffer pad 33 of the adjustment component 30 under the working condition of low power gear (i.e., the wind pressure in the volute is small), ensuring that the annular wall profile is adjusted in place. It can be understood that although the elastic side wall 21 can always abut against the adjustment component 30 under the magnetic traction of the magnetic member 34, the elastic side wall 21 can still slide relative to the adjustment component 30, and will not hinder the change of the annular wall circumference during the profile adjustment process; at the same time, the magnetic member 34 located outside the elastic side wall 21 will not have an adverse effect on the flow field in the volute, which is conducive to ensuring the reliability of the test results.

[0057] Exemplarily, the elastic side wall 21 can be implemented as a magnetically attractive component, that is, the elastic side wall 21 can be but is not limited to being made of a magnetically attractive material such as iron or an alloy; the magnetic component 34 can be correspondingly implemented as a magnet, so that the magnetic component 34 and the elastic side wall 21 generate a magnetic attraction force, so as to pull the elastic side wall 21 by means of magnetic force.

[0058] Alternatively, if Figure 3 As shown, the adjustment rod 31 has a notch groove 310 for accommodating the buffer pad 33 and the magnetic member 34; the magnetic member 34 is attached to the bottom of the notch groove 310, and the buffer pad 33 is attached to the side of the magnetic member 34 away from the bottom of the notch groove 310.

[0059] Optionally, the length of the magnetic member 34 is equal to the width of the elastic side wall 21 ; the width of the magnetic member 34 is equal to the diameter of the adjustment rod 31 . Meanwhile, the length and width of the buffer pad 33 are respectively equal to the length and width of the magnetic member 34 .

[0060] Optionally, the bottom width of the notch groove 310 is equal to the diameter of the adjustment rod 31, that is, the central axis of the adjustment rod 31 is within the plane where the bottom of the notch groove 310 is located, so that the bottom of the notch groove 310 can match the cross section of the magnetic member 34. In this way, the portion of the adjustment component 30 corresponding to the elastic side wall 21 and the end cover 11 has a cross section that is a combination of a rectangle and a semicircle. When the adjustment rod 31 is fixed to the adjustment groove 112 of the end cover 11, the buffer pad 33 faces the elastic side wall 21 so as to abut against the elastic side wall 21; at this time, since the diameter of the adjustment rod 31 is greater than the width of the adjustment hole 400, the flexible flange 42 will squeeze the adjustment rod 31 to limit the adjustment rod 31 from sliding along the adjustment groove 112.

[0061] Alternatively, if Figure 3 and Figure 6 As shown, the sum of the thickness of the buffer pad 33 and the magnetic member 34 is less than the difference between the width of the adjustment hole 400 and the radius of the adjustment rod 31. In this way, when the position of the adjustment rod 31 needs to be adjusted, it is only necessary to rotate the adjustment rod 31 so that the buffer pad 33 faces the side wall of the adjustment hole 400 (i.e., deviates from the elastic side wall 21), so that the squeezing of the adjustment rod 31 by the flexible flange 42 can be released, so that the adjustment rod 31 can be slid along the adjustment groove 112 to adjust the profile; and after the adjustment is in place, it is only necessary to rotate the adjustment rod 31 in the opposite direction so that the buffer pad 33 faces the elastic side wall 21, so that the adjustment rod 31 can be squeezed by the flexible flange 42 to limit and fix.

[0062] It is worth noting that since the portion of the adjustment component 30 corresponding to the end cover 11 has a cross-section that is a combination of a rectangle and a semicircle, during the rotation of the adjustment rod 31, the flexible flange 42 can not only be compressed to achieve spatial avoidance and prevent jamming, but also ensure sealing to prevent the airflow in the volute from leaking around the column between the adjustment rod 31 and the side wall of the adjustment groove 112.

[0063] Optionally, the diameter d of the adjustment rod 31 satisfies the relationship d≥2.5*(tc+th), where tc is the thickness of the magnetic member 34, and th is the thickness of the buffer pad 33, so as to reserve a gap of at least 0.1d for the adjustment rod 31 to ensure convenient sliding.

[0064] Optionally, the width dm of the adjustment hole 400 of the sealing gasket 40 is slightly smaller than the diameter d of the adjustment rod 31, so that after the adjustment rod 31 is rotated, a pressing force is applied to the adjustment rod 31 through the flexible flange 42 to further improve the sealing effect. For example, the width dm of the adjustment hole 400 is between 0.95d and 0.98d.

[0065] It is worth noting that in the present application, the width D of the adjustment slot 112 is dm+2*tm, where dm is the width of the adjustment hole 400, and tm is the thickness of the flexible flange 42. If the thickness tm of the flexible flange 42 is set too small, the deformability of the flexible flange 42 will be too small, resulting in inflexible rotation of the adjustment rod 31; and if the thickness tm of the flexible flange 42 is set too large, the deformation of the flexible flange 42 will be too large under the action of the wind pressure in the volute, resulting in reduced air tightness. Therefore, in order to ensure the rationality of the design, the present application needs to determine the applicable range of the thickness of the flexible flange 42 based on the geometric parameters of the adjustment component 30.

[0066] First, considering that the portion of the adjustment component 30 corresponding to the end cover 11 has a cross section of a combination of a rectangle and a semicircle, when it rotates around the center of the semicircle, the width F(θ) of its projection in the horizontal direction and the rotation angle θ satisfy the following relationship:

[0067]

[0068] Since cos(α+θ)≤1, the width F(θ) of the adjustment component 30 projected in the horizontal direction and the rotation angle θ satisfy the following relationship:

[0069]

[0070] Wherein: t=tc+th; that is, t is the sum of the thickness tc of the magnetic member 34 and the thickness th of the buffer pad 33 .

[0071] In other words, when the adjustment component 30 rotates, its maximum dimension Fmax in the width direction of the adjustment hole 400 satisfies the relationship:

[0072]

[0073] In addition, since the width dm of the adjustment hole 400 is between 0.95d and 0.98d, the maximum deformation amount δ of the flexible flange 42 is max The following relationship (1) is satisfied:

[0074]

[0075] It is worth noting that, generally speaking, when the maximum deformation δ of the flexible flange 42 max When the ratio of the thickness tm of the flexible flange 42 is between 5% and 25%, the flexible flange 42 can ensure the convenient rotation of the adjusting rod 31 and ensure good air tightness; that is, the thickness tm of the flexible flange 42 satisfies the following relationship:

[0076] 4*δ max ≤tm≤20*δmax (2).

[0077] By integrating the above equations (1) and (2), it can be obtained that the thickness tm of the flexible flange 42 satisfies the equation:

[0078]

[0079] Wherein: tm is the thickness of the flexible flange 42 ; d is the diameter of the adjustment rod 31 ; t is the sum of the thicknesses of the buffer pad 33 and the magnetic member 34 ; and dm is the width of the adjustment hole 400 .

[0080] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. The fan volute with adjustable profile is characterized by: include: The volute frame comprises a pair of end covers arranged at intervals, each of the end covers having an air inlet and a plurality of adjustment slots arranged around the air inlet; The volute ring wall comprises an elastic side wall movably arranged between the two end covers and a volute tongue fixedly arranged between the two end covers; one end of the elastic side wall is fixedly connected to the two end covers to form an air outlet with the volute tongue; the other end of the elastic side wall is rolled up inside the volute tongue to form a reel; as well as Multiple adjustment components, each of which includes an adjustment rod that is slidably inserted into the opposite adjustment grooves on the two end covers and abuts against the outer wall surface of the elastic side wall, and a fixed cover plate that is connected to both ends of the adjustment rod and is respectively located on the outside of the two end covers; the fixed cover plate extends outward from the adjustment rod to always cover the adjustment groove when the adjustment rod is adjusted along the adjustment groove.

2. The adjustable profile fan volute according to claim 1, characterized in that: The regulating groove is a strip-shaped slide groove extending along the radial direction of the air inlet; the fixed cover plate is a runway-shaped baffle, and the long side of the runway-shaped baffle corresponds to the extension direction of the strip-shaped slide groove.

3. The adjustable profile fan volute according to claim 1 or 2, characterized in that: It also includes a pair of sealing gaskets respectively located between the two end covers and the volute ring wall, and each of the sealing gaskets has an adjustment hole corresponding to the adjustment groove one by one.

4. The adjustable profile fan volute according to claim 3, characterized in that: The sealing pad comprises a flexible pad body providing the adjustment hole; the flexible pad body is convexly arranged on the inner wall surface of the end cover and extends along the elastic side wall to fill the gap between the end cover and the elastic side wall.

5. The adjustable profile fan volute according to claim 4, characterized in that: The sealing pad further includes a flexible flange extending along the edge of the adjustment hole and extending from the flexible pad body into the adjustment groove.

6. The adjustable profile fan volute according to claim 5, characterized in that: The adjusting rod is threadedly connected to the fixed cover plate; the diameter of the adjusting rod is larger than the width of the adjusting hole and smaller than the width of the adjusting slot.

7. The adjustable profile fan volute according to claim 6, characterized in that: The adjustment component further includes a buffer pad fixed to the adjustment rod and in contact with the elastic side wall, and a magnetic member located between the adjustment rod and the buffer pad and magnetically attracting the elastic side wall.

8. The adjustable profile fan volute according to claim 7, characterized in that: The adjusting rod has a notch groove for accommodating the buffer pad and the magnetic part; the bottom width of the notch groove is equal to the diameter of the adjusting rod; the sum of the thickness of the buffer pad and the magnetic part is less than the difference between the width of the adjusting hole and the radius of the adjusting rod.

9. The adjustable profile fan volute according to claim 8, characterized in that: The thickness of the flexible flange satisfies the relationship: In the formula: tm is the thickness of the flexible flange; d is the diameter of the adjustment rod; t is the sum of the thickness of the buffer pad and the magnetic member; dm is the width of the adjustment hole.

10. A test fan, characterized in that: include: A fan volute with adjustable profile as claimed in any one of claims 1 to 9; and An impeller is rotatably arranged on the profile-adjustable fan volute.

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