CN113849932A - Volute molded line and check valve molded line drawing method, air duct structure and range hood - Google Patents
Volute molded line and check valve molded line drawing method, air duct structure and range hood Download PDFInfo
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- CN113849932A CN113849932A CN202111135936.1A CN202111135936A CN113849932A CN 113849932 A CN113849932 A CN 113849932A CN 202111135936 A CN202111135936 A CN 202111135936A CN 113849932 A CN113849932 A CN 113849932A
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Abstract
The invention relates to the technical field of design of range hoods, in particular to a volute profile drawing method, a check valve profile drawing method, an air duct structure and a range hood. The volute profile drawing method provided by the invention is characterized in that on the basis of a first volute profile generated by a logarithmic spiral, the opening degree of the first spiral segment is gradually increased according to the region equivalent, then a second spiral segment is synthesized again, and a final second volute profile is synthesized by the second spiral segment and a first straight segment, a second straight segment, a volute tongue profile and a third straight segment of the first volute profile; compared with the existing volute profile generation method, the volute profile drawing method provided by the application reserves the advantages of logarithmic spiral, can be used for conveniently and rapidly carrying out local correction on the volute profile according to the limiting conditions, enables the volute profile to be uniformly increased without sudden change, and finally enables the air flow in the volute to be accelerated more uniformly and stably, the pressure pulsation is reduced, and the pneumatic noise is reduced.
Description
Technical Field
The invention relates to the technical field of design of range hoods, in particular to a volute profile drawing method, a check valve profile drawing method, an air duct structure and a range hood.
Background
The air duct system of the household range hood mainly comprises a volute component, an impeller, a motor component, a check valve and the like, wherein the volute and the check valve provide a flow channel of gas; the volute functions to direct the gas exiting the impeller toward the volute outlet and to convert some of the dynamic pressure to static pressure. The flow in the volute is very complicated, and when gas flows along the volute, gas constantly enters the volute from the impeller, namely the gas flows and is mixed, so that the design of the volute profile directly determines the pneumatic performance of the fan, and further determines the pneumatic performance and the noise performance of the range hood.
At present, the volute molded line is usually designed by a four-segment arc method and a logarithmic spiral method.
As shown in fig. 1, the four-segment arc method adopts four-segment arcs to draw the molded lines of the volute, the selection of parameters is often accumulated by a large amount of experience, the drawing process is complicated, if the width, height, and the like of the volute are changed, the size of the four-segment arcs needs to be changed simultaneously, and local correction is extremely difficult, so that the curve is discontinuous and the generation is complicated.
As shown in fig. 2, a logarithmic spiral generated volute profile is used, which is generated from the curves of a single equation. If the width, height and the like of the volute are changed, the correction of the whole curve can be obtained only by correcting the R coefficient in the equation, but the defect that the local correction cannot be carried out exists.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in the existing volute profile design, if the width and height dimensions of the volute are changed, the local modification of the volute profile is difficult.
(II) technical scheme
In order to solve the above technical problem, an embodiment of an aspect of the present invention provides a method for drawing a volute profile, including:
selecting an impeller radius R1 according to the width W1 of the case and the height H1 of the case, and forming a first molded line of the volute according to a logarithmic spiral equation;
the first volute molded line comprises a first straight line section, a second straight line section, a volute tongue molded line, a first spiral line section and a third straight line section which are connected in sequence;
the first spiral line segment is divided into N parts in an equal angle mode through N +1 rays with the origin O of the logarithmic spiral as the starting point, and a circle is drawn by taking O as the center of a circle and R1 as the radius to form an impeller profile;
the distance between the intersection point of each ray and the impeller molded line and the intersection point of each ray and the first spiral line segment is the opening degree of each ray, and the difference value of the opening degrees between every two adjacent rays is a fixed value along the extension direction of the first spiral line segment;
correcting the intersection point position of each ray and the first molded line of the volute according to a preset opening difference value by taking the molded line of the impeller as a reference, and sequentially fitting N corrected intersection points to form a new second spiral line segment; and the first straight line segment, the second straight line segment, the volute tongue molded line, the second spiral line segment and the third straight line segment which are connected in sequence form a second molded line of the volute.
According to one embodiment of the invention, the first spiral line segment comprises a first segment and a second segment, and the volute shaped line is connected with the second segment through the first segment;
the second segment comprises a first arc segment and a second arc segment, the starting point of the first arc segment is Z, the end point of the first arc segment is K, and the starting point of the second arc segment is K, and the end point of the second arc segment is U;
presetting the difference value y of the opening degrees corresponding to two adjacent rays on the first arc segment, and sequentially correcting the intersection point position of each ray corresponding to the first arc segment and the first molded line of the volute by taking the starting point Z as a reference according to the difference value y along the direction from the starting point to the end point of the first arc segment;
presetting the difference value of the opening degrees corresponding to two adjacent rays of the second arc segment as x, and sequentially correcting the intersection point position of each ray corresponding to the second arc segment and the first molded line of the volute by taking a starting point U as a reference according to the difference value x along the direction from the end point to the starting point of the second arc segment;
according to the method, the Z point and the U point are re-fitted to form a second spiral line section until the corrected K point position of the first arc line section and the corrected K point position of the second arc line section meet the fitting condition.
According to one embodiment of the invention, a point E is formed on the first arc segment, and the included angle between any two adjacent rays on the first arc segment is < ZOE;
a point T is formed on the second arc segment, an included angle between any two adjacent rays on the second arc segment is alpha 1 which is equal to < UOT >, the segment ET is a horizontal straight line passing through the origin O, and the segment OK is a vertical straight line.
According to one embodiment of the invention, selecting the impeller radius R1 according to the width W1 of the casing and the height H1 of the casing, and forming the first profile of the volute according to the logarithmic spiral equation comprises:
generating a first spiral segment according to a cylindrical coordinate equation R of a logarithmic spiral R1 exp (ζ T), wherein a point T1 is used as a starting point of the logarithmic spiral, the logarithmic spiral passes through an angle of 360+ alpha 1, and a point U is used as an end point of the logarithmic spiral;
an included angle between the third straight line segment and a vertical straight line passing through the origin O is alpha 3, and the position of the end point A of the third straight line segment can be determined as the height H1 of the chassis, the position of the U point and the included angle alpha 3 are preset values;
the length L0 of the first straight line segment is that the width of the volute air outlet is a preset value, and the first straight line segment is a horizontal straight line, so that the position of a first straight line segment end point B can be obtained;
an included angle between the second straight line segment and a vertical straight line passing through the origin O is alpha 2, the distance between the circle center of the volute tongue molded line and the vertical straight line passing through the origin O is W2, W2 and alpha 2 are preset values, the volute tongue molded line is respectively tangent to the second straight line segment and the first spiral line segment, and a starting point C and an end point D of the volute tongue molded line can be obtained;
the first straight line section, the second straight line section, the volute tongue molded line, the first spiral line section and the third straight line section which are connected in sequence form a first molded line of the volute.
According to one embodiment of the invention, 45 ° > α 2 > α 3 > 0 °, α 1 ≦ 15 °.
According to one embodiment of the invention, the length of the line segment ET is less than or equal to W1.
Another embodiment of the present invention further provides a check valve profile drawing method, including: and generating a check valve profile by taking the second volute profile obtained by the volute profile drawing method according to any embodiment as a reference.
According to one embodiment of the present invention, generating a check valve profile with reference to a second profile of the volute comprises:
rotating for alpha 4 degrees by taking the starting point of the first straight line segment as the circle center;
the molded line of the check valve comprises a fourth straight line section, a first circular arc section, a fifth straight line section and a second circular arc section which are sequentially connected, and the fifth straight line section is superposed with the first straight line section;
the starting point of the fourth straight line section is V, the end point of the fourth straight line section is W, and the length of the fourth straight line section is determined according to the diameter of the exhaust pipe;
the height of the check valve is H2, and the diameter R of the first circular arc sectionaThe diameter of the second circular arc section is Rb；And generating the molded line of the check valve according to the length of the fourth straight line section, the diameter of the first circular arc section, the diameter of the second circular arc section and the position of the A point.
According to an embodiment of the present invention, generating the check valve profile according to the length of the fourth straight line segment, the diameter of the first circular arc segment, the diameter of the second circular arc segment, and the position of the a point comprises:
drawing a horizontal line L0, the distance between point A and L0 is equal to H2;
using point A as the center of circle and RbPositioning O for the intersection of the circle drawn by the radius and L01With O1Centered at RbDetermining a second curve by taking the intersection point of the radius drawing circle and the L0 as the starting point V of the fourth straight line segment;
determining the length of VW according to the diameter of the discharge pipe, further determining the position of the end point W of the fourth straight line section, and determining the fourth straight line section;
using point B as center of circle and RaPositioning O for the intersection of the circle drawn by the radius and L02With O2Centered at RaA fourth straight line section, a first circular arc section, a fifth straight line section and a second circular arc section which are connected in sequence are used for drawing a circle for the radius to obtain the second circular arc sectionThe segments form the check valve profile.
In another aspect, an embodiment of the present invention further provides an air duct structure, which includes a check valve and a volute, where the volute is manufactured according to the second profile of the volute provided in the foregoing implementation, and the check valve is manufactured according to the profile of the check valve provided in the foregoing embodiment.
The embodiment of the other aspect of the invention also provides a range hood, which comprises the air duct structure provided by the embodiment.
The invention has the beneficial effects that: the volute profile drawing method provided by the invention comprises the steps of selecting an impeller radius R1 according to the width W1 of a case and the height H1 of the case, and forming a first volute profile according to a logarithmic spiral equation, wherein the first volute profile comprises a first straight line segment, a second straight line segment, a volute tongue profile, a first spiral line segment and a third straight line segment which are sequentially connected; and then according to a preset opening difference value, taking the impeller molded line as a reference, correcting the position of a point on the first spiral line segment, sequentially fitting the N corrected intersection points to form a second spiral line segment, and forming a second molded line of the volute by the sequentially connected first straight line segment, second straight line segment, volute tongue molded line, second spiral line segment and third straight line segment.
According to the volute profile drawing method, based on a first volute profile generated by a logarithmic spiral, the opening degree of a first spiral line segment is gradually increased in an equivalent manner according to the area, then the first spiral line segment is fit to a second spiral line segment again, a final second volute profile is fit to the first straight line segment, the second straight line segment, the volute tongue profile and the third straight line segment of the first volute profile through the second spiral line segment, the opening degree of a local area is re-adapted, the second spiral line segment is uniformly increased and does not have sudden change, finally the air flow in the volute is accelerated more uniformly and stably, the pressure pulsation is reduced, and the pneumatic noise is reduced; compared with the existing volute profile generation method, the volute profile drawing method provided by the application reserves the advantages of logarithmic spiral, and meanwhile can be used for conveniently and rapidly carrying out local correction on the volute profile according to the limiting conditions, so that the volute profile is uniformly increased, and no mutation exists.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a volute profile drawn by a conventional four-segment arc method;
FIG. 2 is a prior art spiral profile plotted using a logarithmic spiral method;
FIG. 3 is a schematic view of a volute profile drawn by the volute profile drawing method according to an embodiment of the present invention;
FIG. 4 is a schematic view of a volute profile drawn by a volute profile drawing method according to yet another embodiment of the invention;
FIG. 5 is a schematic view of the volute profile and check valve profile mating provided by one embodiment of the present invention;
FIG. 6 is a schematic view of a check valve profile provided in accordance with one embodiment of the present invention;
fig. 7 is a schematic view of a range hood according to an embodiment of the present invention.
Icon: 1-a volute; 11-a front cover plate; 12-volute first profile; 121-a first straight line segment; 122-a second straight line segment; 123-volute tongue type line; 124-a first spiral line segment; 1241-first stage; 1242-second section; 12421-first arc segment; 12422-second arc segment; 125-third straight line segment;
13-volute second profile; 131-a second spiral segment;
2-check valve profile; 21-fourth straight line segment; 22-a first arc segment; 23-a second arc segment;
3-a range hood; 31-cabinet.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and detailed description, and the embodiments and features of the embodiments of the present application may be combined with each other without conflict. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to an embodiment of the present invention, as shown in fig. 3 to 5, the present invention provides a volute profile plotting method including: selecting an impeller radius R1 according to the width W1 of the case 31 and the height H1 of the case 31, and forming a first volute profile 12 according to a logarithmic spiral equation; the volute first profile 12 comprises a first straight line segment 121, a second straight line segment 122, a volute tongue profile 123, a first spiral line segment 124 and a third straight line segment 125 which are connected in sequence; the first spiral line segment 124 is divided into N equal angles by N +1 rays taking the origin O of the logarithmic spiral as a starting point, and a circle is drawn by taking O as the center of the circle and R1 as the radius to form an impeller profile; the distance between the intersection point of each ray and the impeller profile line and the intersection point of the ray and the first spiral line segment 124 is the opening degree of the ray, and the difference of the opening degrees between two adjacent rays along the extending direction of the first spiral line segment 124 is a fixed value; correcting the intersection point position of each ray and the first volute line 12 according to a preset opening difference value by taking the impeller line as a reference, and sequentially fitting N corrected intersection points to form a new second spiral line segment 131; the first straight line segment 121, the second straight line segment 122, the volute tongue profile 123, the second spiral line segment 131 and the third straight line segment 125 which are connected in sequence form the volute second profile 13.
In the volute profile, the middle curve is the most critical part of the whole volute profile, however, the volute profile generated by the existing logarithmic spiral is generated by the curve of a single equation, when the width, height and other dimensions of the volute 1 are changed, the R coefficient in the equation can be corrected, namely, the whole curve can be corrected, but the curve part cannot be corrected, so that the curve part is mutated and disconnected. In the volute profile drawing method provided in this embodiment, the impeller radius R1 is selected according to the width W1 of the casing 31 and the height H1 of the casing 31, where the impeller radius has a fixed model, and when a volute profile is generated, a proper impeller radius is selected according to the height and width of the casing 31, and then a first volute profile 12 is formed according to a logarithmic spiral equation; the first spiral segment 124 of the middle portion of the first profile 12 of the volute is then modified. Specifically, the opening degree is sequentially increased on the first spiral line segment 124 according to the area gradual equivalence, the points of the first spiral line segment 124 which are corrected again are sequentially fitted to form a second spiral line segment 131, and the second spiral line segment 131 and the first straight line segment 121, the second straight line segment 122, the volute tongue type line 123 and the third straight line segment 125 of the volute first type line 12 are fitted to form a final volute second type line 13 as the line types of the first straight line segment 121, the second straight line segment 122, the volute tongue type line 123 and the third straight line segment 125 are not changed; because the first spiral line segment 124 is corrected according to the equivalent increasing mode of the opening degree, the line type of the second spiral line segment 131 after being corrected again is uniformly increased without mutation; compared with the existing manner of generating the volute profile by using the logarithmic spiral, the volute second profile 13 generated by the volute profile drawing method provided by the embodiment can be locally corrected, so that the profile is smoother, the acceleration of airflow in the volute 1 is more uniform and stable, the pressure pulsation is reduced, and the aerodynamic noise is reduced.
As shown in fig. 3 and 5, in the present embodiment, the casing 31 is a housing for installing the scroll casing 1, so the width W1 of the casing 31 is greater than the maximum width of the scroll casing 1, and the height H1 of the casing 31 is greater than the maximum height of the scroll casing 1.
According to an embodiment of the present invention, as shown in fig. 3 and 4, the first spiral line segment 124 includes a first segment 1241 and a second segment 1242, and the tongue wire 123 is connected to the second segment 1242 through the first segment 1241; the first section 1241 is connected with the volute tongue molded line 123 and is located in the upper half part of the volute 1, and the influence on the pneumatic performance of the fan is small even if the line type of the volute 1 is not corrected, so that the first section 1241 of the first spiral line does not participate in correction, and only the second section 1242 of the first spiral line located in the lower half part of the volute molded line is locally corrected. Of course, in the present embodiment, the entire first spiral segment 124 may be modified, which also achieves the object of the present invention.
The second segment 1242 comprises a first arc segment 12421 and a second arc segment 12422, the starting point of the first arc segment 12421 is Z, the ending point of the first arc segment 12421 is K, and the starting point of the second arc segment 12422 is K, and the ending point of the second arc segment 12422 is U; in this embodiment, the second segment 1242 of the first spiral segment 124 is divided into a first arc segment 12421 and a second arc segment 12422, and then the second arc segment 12422 and the first arc segment 12421 are respectively corrected according to the equal increase mode of the opening degree, so that the line shape after correction is smooth and has no sudden change, and the sum of the number of the rays equally divided by the first arc segment 12421 and the number of the rays equally divided by the second arc segment 12422 is N + 1.
According to an embodiment of the present invention, as shown in fig. 3 to 5, a starting point of a first arc segment 12421 is Z, an end point is K, a starting point of a second arc segment 12422 is K, an end point is U, a difference between opening degrees corresponding to two adjacent rays on the first arc segment 12421 is preset to be y, and an intersection position of each ray corresponding to the first arc segment 12421 and the first volute profile 12 is sequentially corrected according to the difference y with the starting point Z as a reference along a direction from the starting point to the end point of the first arc segment 12421; as shown in fig. 3, in this embodiment, eight rays are equally divided on the first arc segment 12421, that is, the starting point Z and the end point K OF the first arc segment 12421 are calculated, six intersection points are further provided between the Z point and the K point, the directions from Z to K are the point E, the point F, the point G, the point H, the point I and the point J, the segments OF the corresponding eight rays are OZ, OE, OF, OG, OH, OI, OJ and OK, the included angles between two adjacent segments are equal in degrees, the intersection points OF OZ, OE, OF, OG, OH, OI, OJ and OK and the impeller profile are the point Z1, the point E1, the point F1, the point G8, the point H1, the point I1, the point J1 and the point K1, the length OF the segment ZZ1 is assumed to be L18, the segment 1 is the segment FF1 FF1, the segment 1 is the segment 3, the segment 3 is the segment 5926, the segment 8427 is the segment 8427, the segment 865953 is the segment 84599, the segment 845953 is the segment 849, then L18-L1-L1-L2-L2-L3-L3-L4-L4-L5-L5-L6-L6-L7-y. As shown in fig. 3 and 5, the F, G, H, I, J and K points on the first arc segment 12421 are adjusted according to the above principle.
Similarly, as shown in fig. 3 and fig. 4, the second arc segment 12422 is modified as in the foregoing embodiment, the difference between the opening degrees of two adjacent rays on the second arc segment 12422 is preset as x, and along the direction from the starting point to the end point of the second arc segment 12422, the intersection position of each ray corresponding to the second arc segment 12422 and the first profile 12 of the volute is sequentially modified according to the difference x and using the starting point U as a reference; as shown in fig. 3 and fig. 5, in the present embodiment, eight rays are equally divided on the second arc segment 12422, that is, the starting point K and the end point U of the second arc segment 12422 are calculated, six intersection points are further arranged between the U point and the K point, and the direction from U to K is sequentially a T point, an S point, a Q point, a P point, an N point, and an M point, the line segments of the corresponding eight rays are OU, OT, OS, OQ, OP, ON, OM and OK respectively, the included angle degrees between two adjacent line segments are equal, meanwhile, the intersection points of OU, OT, OS, OQ, OP, ON, OM and OK and the impeller profile are respectively a point U1, a point T1, a point S1, a point Q1, a point P1, a point N1, a point M1 and a point K1, and it is assumed that a line segment UU1 has a length of L14, a line segment TT1 has a length of L13, a line segment SS1 has a length of L12, a line segment QQ1 has a length of L11, a line segment PP1 has a length of L10, a line segment NN1 has a length of L9, a line segment MM1 has a length of L8, and a line segment KK1 has a length of L7.
Then L14-L13-L13-L12-L12-L11-L11-L10-L10-L9-L9-L8-L8-L7-x. As shown in fig. 3 and 5, the points S, Q, P, N, M and K on the second arc segment 12422 are adjusted according to the above principle, and preferably, in the present embodiment, the correction value y of the first arc segment 12421 is equal to the correction value x of the second arc segment 12422.
In fig. 3 and 5, the solid line part in the present embodiment is the first spiral line segment 124 before modification, and the dotted line part is the second spiral line segment 131 after modification; the number of modified intersection points in fig. 3 and 5 in this embodiment is merely illustrative, wherein the number of modified points in the first arc segment 12421 and the second arc segment 12422 may be the same or different, and the number of modified intersection points is not limited to the number in the above embodiment; the angles bisected on first arc segment 12421 and second arc segment 12422 may be the same or different, for example ≠ UOT, or ═ ZOE ≠ UOT, and the correction values for first arc segment 12421 and second arc segment 12422 may also be different.
Preferably, as shown in fig. 3 and fig. 5, in the present embodiment, the preset point T1 is a starting point of a logarithmic spiral, the length of the line segment OT1 is equal to the impeller radius R1, the point U is an end point of the logarithmic spiral (also an end point of the second arc-line segment 12422), and OU is offset from OT angle α 1, that is, the logarithmic spiral travels through an angle of 360+ α 1, where α 1 is also an angle equally divided by the second arc-line segment 12422. In the correction process of the above embodiment of the present application, since L18-L1 ═ y and L14-L13 ═ x are all reference values, that is, the Z point, the E point, the U point, and the T point are all reference values, and no correction is required.
Since the first arc segment 12421 and the second arc segment 12422 of the first spiral segment 124 are respectively corrected, the K point corrected according to the first arc segment 12421 may be different from the K point corrected according to the second arc segment 12422, at this time, correction coefficients x and y need to be adjusted, and finally, the K points corrected according to the first arc segment 12421 and the second arc segment 12422 are overlapped or adjacent, at this time, a fitting condition is satisfied, the points corrected on the first arc segment 12421 and the second arc segment 12422 are fitted and connected with the first segment 1241 of the first spiral segment 124 to form a second spiral segment 131, and the second spiral segment 131 and the first straight segment 121, the second straight segment 122, the volute tongue profile 123 and the third straight segment 125 which are not changed on the volute first profile 12 are fitted to form the corrected volute second profile 13.
Preferably, as shown in fig. 3 and 5, the line segment ET is a horizontal straight line passing through the origin O, and the line segment OK is a vertical straight line, so that the length of ET is smaller than W1.
According to an embodiment of the present invention, as shown in fig. 3 and 5, selecting the impeller radius R1 according to the width W1 of the casing 31 and the height H1 of the casing 31 and forming the volute first profile 12 according to the logarithmic spiral equation includes: the first spiral segment 124 is generated according to the cylindrical coordinate equation R of the logarithmic spiral R1 × exp (ζ × T), where a point T1 is a starting point of the logarithmic spiral, the logarithmic spiral passes through an angle of 360+ α 1, a point U is an end point of the logarithmic spiral, where ζ is a coefficient, typically ζ is 0.6, T is an angle, and R1 is an impeller radius. An included angle between the third straight line segment 125 and a vertical straight line passing through the origin O is α 3, and since the height H1 of the chassis 31, the position of the U point, and the included angle α 3 are preset values, the position of the end point a of the third straight line segment 125 can be determined; the length L0 of the first straight line segment 121 is a preset value of the width of the air outlet of the volute 1, and the first straight line segment 121 is a horizontal straight line, so that the position of the end point B of the first straight line segment 121 can be obtained; an included angle between the second straight line segment 122 and a vertical straight line passing through the origin O is α 2, a distance between the center of the volute tongue type line 123 and the vertical straight line passing through the origin O is W2, W2 and α 2 are preset values, and the volute tongue type line 123 is tangent to the second straight line segment 122 and the first spiral line segment 124 respectively, so that a starting point C and an end point D of the volute type line can be obtained; the first straight line segment 121, the second straight line segment 122, the volute tongue profile 123, the first spiral line segment 124 and the third straight line segment 125 which are connected in sequence form the volute first profile 12. Preferably, in the present embodiment, 45 ° > α 2 > α 3 > 0 °, α 1 ≦ 15 °.
An embodiment of the present invention further provides a volute 1, where the volute 1 includes a front cover plate 11, a rear cover plate, and a circumferential wall disposed between the front cover plate 11 and the rear cover plate, and the second profile 13 of the volute drawn according to the method provided in the above embodiment of the present application constructs an inside contour line of the circumferential wall. Because the contour line of the inner side wall of the volute 1 provided by the invention can be locally corrected, the internal molded line of the volute 1 is smoother and more coherent, the airflow acceleration channel is more stable and smooth, and finally the airflow in the volute 1 is accelerated more uniformly and stably, the pressure pulsation is reduced, and the aerodynamic noise is reduced.
In another aspect of the present invention, a method for drawing a check valve profile 2 is provided, in which the check valve profile 2 is generated based on the second volute profile 13 generated in the above embodiment. The traditional check valve, namely a simple square-to-round structure, cannot be designed in any relation with the molded line of the volute, so that forced steering and impact of airflow in the check valve are caused, and rapid performance loss is caused. As shown in fig. 5 and 6, the check valve profile 2 generated by the check valve profile 2 drawing method provided by the present application is adapted to the second volute profile design, and the air flow coming out of the volute 1 and entering the check valve also flows along the profile without sudden change and is integrated into a whole, so that the air flow runs more rapidly and stably, and the noise can be reduced and the pneumatic performance can be improved.
Preferably, the generating the check valve profile 2 based on the second profile 13 of the volute in the present embodiment includes: rotating the second volute line 13 by alpha 4 degrees by taking the starting point of the first straight line segment 121 as the center of a circle; the check valve molded line 2 comprises a fourth straight line section 21, a first circular arc section 22, a fifth straight line section and a second circular arc section 23 which are sequentially connected, and the fifth straight line section is superposed with the first straight line section 121; the starting point of the fourth straight line section 21 is V, the end point of the fourth straight line section 21 is W, and the length of the fourth straight line section 21 is determined according to the diameter of the exhaust pipe; the height of the check valve is H2, and the diameter R of the first circular arc section 22aThe diameter of the second circular arc segment 23 is Rb；The check valve profile 2 is generated according to the length of the fourth straight line segment 21, the diameter of the first circular arc segment 22, the diameter of the second circular arc segment 23 and the position of the point a.
Since the width of the casing 31 in the present application is limited, and at the same time, the entire second volute profile 13 needs to rotate by α 4 degrees, the distance from the side wall of the casing 31 to the starting point V of the fourth straight line segment 21 can be determined according to the width W1 of the casing 31 and the rotation angle α 4 of the second volute profile 13, that is, a vertical straight line is made through V, the distance between the vertical straight line and the side wall of the casing 31 is L16, and the distance between the vertical straight line corresponding to the starting point a of the first straight line segment 121 and the vertical straight line corresponding to V is L15, because the rotation angle α 4 is known and the width W1 of the casing 31 is known, the numerical range of L16 can be determined, and the numerical range of L15 can be determined; because the installation height of the whole machine has certain limitation, the height H2 of the check valve can be determined, a horizontal line L0 is drawn at the moment, and the distance between the point A and the point L0 is equal to H2; using point A as the center of circle and RbPositioning O for the intersection of the circle drawn by the radius and L01With O1Centered at RbA second curve is determined for the point V at which the radius circles and L0 intersect, as the starting point of the fourth straight line segment, and has only (or nearly) a vertical component.
Because the exhaust pipe needs to be according to the international recommended exhaust pipe diameter, when the molded line of the check valve is designed, the exhaust pipe with the proper pipe diameter is selected according to the height of the check valve and the molded line information of the volute, the diameter of the exhaust pipe is equal to the length of the fourth straight line section 21, the position of the end point W of the fourth straight line section 21 is further determined, and the linear shape of the fourth straight line section 21 is determined;
using point B as center of circle and RaPositioning O for the intersection of the circle drawn by the radius and L02Wherein R isaThe constant value needs to be selected according to different exhaust pipe diameters, and O is used2Centered at RaThe second arc section 23 is obtained by drawing a circle for the radius, and has a component only (or close to) in the vertical direction at the point W, and the check valve molded line 2 is formed by the fourth straight section 21, the first arc section 22, the fifth straight section and the second arc section 23 which are sequentially connected.
In this embodiment, the first arc segment 22 and the second arc segment 23 are designed to fit the volute profile. Meanwhile, the check valve formed by the second arc section 23 and the first arc section 22 has a structure that the lower opening AB gradually increases to the outlet VW, so that the airflow at the outlet of the volute 1 is well diffused in the interval. When the air flow passes through the diffuser (check valve), because the area of the passage is continuously enlarged, a part of kinetic energy is changed into static pressure energy, thereby improving the static pressure and efficiency of the fan system and reducing the dynamic pressure loss of an outlet.
An embodiment of the present invention in one aspect further provides a check valve, as shown in fig. 5 and 6, including an outer side plate, an inner side plate, a front side plate and a rear side plate; the outer side plate, the inner side plate, the front side plate and the rear side plate are connected to form a smoke exhaust channel with a smoke inlet and a smoke exhaust port, wherein the outer side plate, the inner side plate, the upper edge of the check valve and the lower edge of the check valve are prepared according to the check valve molded line 2 in the embodiment, the inner wall of the outer side plate is in a first arc section 22, and the inner wall of the inner side plate is in a second arc section 23. The application provides a check valve adaptation spiral case 1 designs and forms, goes out from spiral case 1 and gets into the check valve air current and also flows along the molded lines, does not have the sudden change, fuses as an organic whole. Meanwhile, the smoke exhaust channel in the check valve is gradually increased from bottom to top, so that the airflow at the outlet of the volute 1 is well diffused in the interval. When the air flow passes through the diffuser (check valve), because the area of the passage is continuously enlarged, a part of kinetic energy is changed into static pressure energy, thereby improving the static pressure and efficiency of the fan system and reducing the dynamic pressure loss of an outlet.
In another aspect of the present invention, an embodiment further provides an air duct system, including the check valve and the volute 1 prepared according to the above embodiment, where the check valve is installed on the volute 1, and in the air duct system provided in this embodiment, because a profile of the inside of the volute 1 can be locally modified, and a profile of the check valve is drawn according to a profile of the volute 1, static pressure and efficiency of the fan system can be improved, and dynamic pressure loss at an outlet is reduced.
As shown in fig. 7, in an embodiment of an aspect of the present invention, a range hood 3 includes the air duct system provided in the above embodiment. Which is installed in the cabinet 31 to form a complete range hood 3. The range hood 3 provided by the embodiment has the advantages that the pneumatic performance is improved, the noise is reduced, and enough check valve installation space is reserved in advance, the contour line of the check valve is synchronously provided in the design of the volute profile, and the design methods such as installation space, height and expansion are combined to provide, so that the check valve can be well matched with the volute 1 and the exhaust pipe from the bottom inlet to the top plate outlet, has a structure with a small lower part and a large upper part, and synchronously has the function of a diffuser.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in 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 in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (11)
1. A volute profile drawing method is characterized by comprising the following steps:
selecting an impeller radius R1 according to the width W1 of the chassis (31) and the height H1 of the chassis (31), and forming a first volute profile (12) according to a logarithmic spiral equation;
the volute first molded line (12) comprises a first straight line section (121), a second straight line section (122), a volute tongue molded line (123), a first spiral line section (124) and a third straight line section (125) which are connected in sequence;
the first spiral line segment (124) is divided into N parts in an equal angle mode by N +1 rays with the origin O of the logarithmic spiral as the starting point, and a circle is drawn by taking O as the center of a circle and R1 as the radius to form an impeller profile;
the distance between the intersection point of each ray and the impeller molded line and the intersection point of the ray and the first spiral line segment (124) is the opening degree of the ray, and the difference of the opening degrees between two adjacent rays along the extending direction of the first spiral line segment (124) is a fixed value;
correcting the intersection point position of each ray and the first volute profile (12) according to a preset opening difference value by taking the impeller profile as a reference, and sequentially fitting N corrected intersection points to form a new second spiral line segment (131); the first straight line section (121), the second straight line section (122), the volute tongue molded line (123), the second spiral line section (131) and the third straight line section (125) which are connected in sequence form a second volute molded line (13).
2. The volute profile drawing method according to claim 1, wherein the first spiral segment (124) comprises a first segment (1241) and a second segment (1242), and the volute profile (123) is connected to the second segment (1242) through the first segment (1241);
the second segment (1242) comprises a first arc segment (12421) and a second arc segment (12422), the starting point of the first arc segment (12421) is Z, the end point of the first arc segment is K, and the starting point of the second arc segment (12422) is K, and the end point of the second arc segment is U;
presetting the difference value y of the opening degrees corresponding to two adjacent rays on the first arc line segment (12421), and sequentially correcting the intersection point position of each ray corresponding to the first arc line segment (12421) and the first volute profile (12) by taking the starting point Z as a reference according to the difference value y along the direction from the starting point to the end point of the first arc line segment (12421);
presetting the difference value of the opening degrees corresponding to two adjacent rays of the second arc line segment (12422) as x, and sequentially correcting the intersection point position of each ray corresponding to the second arc line segment (12422) and the first volute molded line (12) by taking a starting point U as a reference according to the difference value x along the direction from the end point to the starting point of the second arc line segment (12422);
according to the method, until the position of the K point corrected by the first arc line segment (12421) and the position of the K point corrected by the second arc line segment (12422) meet the fitting condition, all corrected intersection points from the Z point to the U point are re-fitted, and the first segment (1241) of the first spiral line segment (124) forms a second spiral line segment (131).
3. The volute profile drawing method according to claim 2, wherein a point E is formed on the first arc segment (12421), and an included angle between any two adjacent rays on the first arc segment (12421) is ═ ZOE;
a point T is formed on the second arc line segment (12422), an included angle between any two adjacent rays on the second arc line segment (12422) is alpha 1 which is equal to UOT, the line segment ET is a horizontal straight line passing through an origin O, and the line segment OK is a vertical straight line.
4. The volute profile mapping method of claim 3, wherein selecting an impeller radius R1 based on the width W1 of the casing (31) and the height H1 of the casing (31) and forming the first volute profile (12) according to a logarithmic spiral equation comprises:
generating a first spiral segment (124) according to a cylindrical coordinate equation R of a logarithmic spiral R1 × exp (ζ × T), wherein a point T1 is used as a starting point of the logarithmic spiral, the logarithmic spiral passes through an angle of 360+ α 1, and a point U is used as an end point of the logarithmic spiral;
an included angle between the third straight line segment (125) and a vertical straight line passing through the origin O is alpha 3, and the position of the end point A of the third straight line segment (125) can be determined as the height H1 of the case (31), the position of the U point and the included angle alpha 3 are preset values;
the length L0 of the first straight line segment (121) is that the width of the volute air outlet is a preset value, and the first straight line segment (121) is a horizontal straight line, so that the position of the end point B of the first straight line segment (121) can be obtained;
an included angle between the second straight line segment (122) and a vertical straight line passing through the origin O is alpha 2, the distance between the center of the volute tongue type line (123) and the vertical straight line passing through the origin O is W2, W2 and alpha 2 are preset values, the volute tongue type line (123) is respectively tangent to the second straight line segment (122) and the first spiral line segment (124), and a starting point C and an end point D of the volute tongue type line can be obtained;
the first straight line section (121), the second straight line section (122), the volute tongue molded line (123), the first spiral line section (124) and the third straight line section (125) which are connected in sequence form the first molded line (12) of the volute.
5. The volute profile drawing method according to claim 4, wherein 45 ° > α 2 > α 3 > 0 °, α 1 ≦ 15 °.
6. The volute profile drawing method of claim 4, wherein the length of the line segment ET is less than or equal to W1.
7. A check valve profile plotting method, comprising: -generating a check valve profile (2) with reference to a volute second profile (13) obtained by a volute profile drawing method according to any of claims 1 to 6.
8. The check valve profile profiling method according to claim 7, wherein generating the check valve profile (2) with reference to the volute second profile (13) comprises:
rotating by alpha 4 degrees by taking the starting point of the first straight line segment (121) as the center of a circle;
the check valve molded line (2) comprises a fourth straight line section (21), a first circular arc section (22), a fifth straight line section and a second circular arc section (23) which are sequentially connected, and the fifth straight line section is superposed with the first straight line section (121);
the starting point of the fourth straight line section (21) is V, the end point of the fourth straight line section is W, and the length of the fourth straight line section (21) is determined according to the diameter of the exhaust pipe;
the height of the check valve is H2, and the diameter R of the first circular arc section (22)aThe diameter of the second circular arc section (23) is Rb(ii) a And generating the check valve molded line (2) according to the length of the fourth straight line segment (21), the diameter of the first circular arc segment (22), the diameter of the second circular arc segment (23) and the position of the A point.
9. The check valve profile profiling method of claim 8,
generating the check valve profile (2) from the length of the fourth straight line segment (21), the diameter of the first circular arc segment (22), the diameter of the second circular arc segment (23) and the position of the A point comprises:
drawing a horizontal line L0, the distance between point A and L0 is equal to H2;
using point A as the center of circle and RbPositioning O for the intersection of the circle drawn by the radius and L01With O1Centered at RbDetermining a second curve by taking the intersection point of the radius drawing circle and the L0 as the starting point V of the fourth straight line segment (21);
determining the length of VW according to the diameter of the discharge pipe, further determining the position of the end point W of the fourth straight line section (21), and determining the fourth straight line section (21);
using point B as center of circle and RaPositioning O for the intersection of the circle drawn by the radius and L02With O2Centered at RaA second arc segment (23) is obtained for drawing a circle for the radius, and a fourth straight segment is connected in sequenceThe line segment (21), the first arc segment (22), the fifth line segment and the second arc segment (23) form a check valve molded line (2).
10. An air duct structure, characterized by comprising a non-return valve and a volute (1), the volute (1) being made according to the second profile (13) of the volute of any one of claims 7 to 9, and the non-return valve being made according to the profile (2) of the non-return valve of any one of claims 7 to 9.
11. A range hood comprising the air duct structure of claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111135936.1A CN113849932A (en) | 2021-09-27 | 2021-09-27 | Volute molded line and check valve molded line drawing method, air duct structure and range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111135936.1A CN113849932A (en) | 2021-09-27 | 2021-09-27 | Volute molded line and check valve molded line drawing method, air duct structure and range hood |
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| Publication Number | Publication Date |
|---|---|
| CN113849932A true CN113849932A (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111135936.1A Pending CN113849932A (en) | 2021-09-27 | 2021-09-27 | Volute molded line and check valve molded line drawing method, air duct structure and range hood |
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| CN (1) | CN113849932A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116992601A (en) * | 2023-09-27 | 2023-11-03 | 广东顺威精密塑料股份有限公司 | Design method of volute runner |
-
2021
- 2021-09-27 CN CN202111135936.1A patent/CN113849932A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116992601A (en) * | 2023-09-27 | 2023-11-03 | 广东顺威精密塑料股份有限公司 | Design method of volute runner |
| CN116992601B (en) * | 2023-09-27 | 2023-12-26 | 广东顺威精密塑料股份有限公司 | Design method of volute runner |
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