Volute, fan and sanitation vehicle

Abstract

The utility model discloses a volute, a fan and a sanitation vehicle. The volute is provided with a volute inner wall molded line, the volute inner wall molded line comprises a first arc section, a second arc section, a third arc section and a fourth arc section in the spiral gradually-expanding direction, the radius of the first arc section is R1, the circle center of the first arc section is O1, the radius of the second arc section is R2, the circle center of the second arc section is O2, the radius of the third arc section is R3, the circle center of the third arc section is O3, the radius of the fourth arc section is R4, and the circle center of the fourth arc section is O4. R1 < R2 < R3 < R4, and a connecting line of O1 and O2, a connecting line of O2 and O3, a connecting line of O3 and O4, and a connecting line of O4 and O1 form a square. By optimizing the molded line of the inner wall of the volute, when air flow is sucked into the volute, flowing of the air flow is more uniform, flowing losses of vortexes, backflow, secondary flow and the like are smaller, the overall efficiency of the fan can be effectively improved by reducing the flowing losses of the air flow, noise and energy consumption can be reduced easily due to the smaller flowing losses of the air flow, and when the volute is applied to the fan, the overall efficiency of the fan is improved. And the suction effect of the fan can be greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of sanitation vehicles, and in particular to a volute, a fan and a sanitation vehicle. Background Art

[0002] The sanitation vehicle is a new type of high-efficiency cleaning vehicle that integrates road cleaning, garbage collection and transportation. Its performance is mainly determined by the fan. At present, the design and selection of the fan of the sanitation vehicle mainly optimizes the aerodynamics of the volute and impeller. In related technologies, the fan is mainly based on the 9-26 fan as the prototype for modification or partial optimization, but there are still problems such as outdated volute inner wall profile technology, resulting in low overall fan efficiency. Utility Model Content

[0003] The present application aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present application proposes a volute.

[0004] To achieve the above-mentioned purpose, the present application discloses a volute, which has a volute inner wall profile, and the volute inner wall profile includes a first arc segment, a second arc segment, a third arc segment and a fourth arc segment along the spiral expansion direction, the radius of the first arc segment is R1 and the center is O1, the radius of the second arc segment is R2 and the center is O2, the radius of the third arc segment is R3 and the center is O3, the radius of the fourth arc segment is R4 and the center is O4, satisfying R1<R2<R3<R4, and the connecting line of O1 and O2, the connecting line of O2 and O3, the connecting line of O3 and O4, and the connecting line of O4 and O1 form a square.

[0005] In some embodiments of the present application, the volute is suitable for installing an impeller, the diameter of the impeller is D, satisfying D=γ*100mm; the side length of the square is a, satisfying a=γ*4.8mm; and R1=γ*(57mm~59mm), R2=γ*(62mm~64mm), R3=γ*(67mm~69mm), R4=γ*(72mm~74mm); wherein 4≤γ≤10.

[0006] In some embodiments of the present application, the volute inner wall profile further includes a first air outlet segment, a volute tongue segment, and a second air outlet segment, wherein the first air outlet segment, the volute tongue segment, the first circular arc segment, the second circular arc segment, the third circular arc segment, the fourth circular arc segment, and the second air outlet segment are arranged in sequence along the spiral expansion direction, and an air outlet is provided between the first air outlet segment and the second air outlet segment;

[0007] The distance between the first air outlet section and the second air outlet section is A, satisfying A=γ*(32mm~34mm); and / or the distance between the second air outlet section and the center of the volute along the first direction is B, satisfying B=γ*(73mm~77mm), and the first direction is the direction of the first air outlet section and the second air outlet section toward each other; and / or the distance between the air outlet and the center of the volute along the second direction is C, satisfying C=γ*(70mm~80mm), and the second direction is the extension direction of the second air outlet section; and / or the radius of the volute tongue section is r1, satisfying r1=γ*(4mm~4.5mm).

[0008] In some embodiments of the present application, the volute includes a front cover plate and a rear cover plate arranged alternately with the front cover plate, the front cover plate is provided with an air inlet, and the distance between the front cover plate and the rear cover plate is L, satisfying L=γ*(29mm~31mm).

[0009] In some embodiments of the present application, the volute comprises:

[0010] A front cover plate, the front cover plate is in a flat plate shape and is provided with an air inlet; and

[0011] An air inlet sleeve is arranged on the air inlet and is suitable for allowing air flow to pass through.

[0012] In some embodiments of the present application, the volute is suitable for installing an impeller, and along the axial direction of the air inlet sleeve, the distance between the front cover plate and the impeller is K1, satisfying K1=γ*(5mm~6mm), and 4≤γ≤10.

[0013] In some embodiments of the present application, along the axial direction of the air inlet sleeve, the length of the air inlet sleeve is K2, satisfying K2=γ*(10mm~12mm), and 4≤γ≤10.

[0014] In some embodiments of the present application, the volute is suitable for installation of an impeller, and the air inlet sleeve has an inner end and an outer end, the inner end is located inside the volute, the outer end is located outside the volute, and the inner end is suitable for extending into the inlet of the impeller.

[0015] In some embodiments of the present application, along the radial direction of the air inlet sleeve, the distance between the inner end and the edge of the impeller inlet is K3, satisfying K3=γ*(0.5mm~0.7mm), and 4≤γ≤10.

[0016] In some embodiments of the present application, the outer end is tapered along the axial direction of the air inlet sleeve.

[0017] In some embodiments of the present application, the volute includes a front cover plate, a surrounding plate and a rear cover plate, the front cover plate is provided with an air inlet, the surrounding plate is provided between the front cover plate and the rear cover plate, and there is a rounded transition between the surrounding plate and the front cover plate and the rear cover plate.

[0018] The present application also discloses a fan, which includes the volute mentioned above, and the impeller is rotatably arranged inside the volute.

[0019] In some embodiments of the present application, the impeller is a backward impeller.

[0020] The present application also discloses a sanitation vehicle, which includes the above-mentioned fan.

[0021] The technical solution of the present application optimizes the inner wall profile of the volute, so that when the airflow is sucked into the interior of the volute, the flow of the airflow is more uniform, and the flow losses such as eddy current, backflow and secondary flow are smaller. By reducing the flow losses of the airflow, the overall efficiency of the fan can be effectively improved. Moreover, smaller flow losses of the airflow will help reduce noise and energy consumption. When the volute is applied to the fan, the suction effect of the fan can be greatly improved.

[0022] Other advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other designs can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 Schematic diagram of a fan in some embodiments;

[0025] Figure 2 for Figure 1 Middle square schematic diagram;

[0026] Figure 3 A cross-sectional view of a fan in some embodiments;

[0027] Figure 4 for Figure 3 The enlarged view marked as A in FIG.

[0028] Figure 5 Schematic diagram of a fan in some embodiments (relative to Figure 1 mirror image);

[0029] Figure 6Schematic diagram of a fan in some embodiments (relative to Figure 1 Rotate a certain angle);

[0030] Figure 7 A side view of a fan in some embodiments.

[0031] Description of Figure Numbers:

[0032] Fan 1000, impeller 2000, inlet 2100, volute 3000, front cover 3100, air inlet 3110, rear cover 3200, enclosure 3300, volute inner wall profile 3310, first air outlet section 3311, volute tongue section 3312, first circular arc section 3313, second circular arc section 3314, third circular arc section 3315, fourth circular arc section 3316, second air outlet section 3317, air outlet 3400, air inlet sleeve 3500, outer end 3510, inner end 3520.

[0033] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 this application can be understood according to specific circumstances.

[0037] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0038] The first aspect of the present application provides a volute 3000, combined with Figure 1 and Figure 2 As shown, the volute 3000 has a volute inner wall profile 3310, and the volute inner wall profile 3310 includes a first arc segment 3313, a second arc segment 3314, a third arc segment 3315 and a fourth arc segment 3316 along the spiral expansion direction. The radius of the first arc segment 3313 is smaller than the radius of the second arc segment 3314, the radius of the second arc segment 3314 is smaller than the radius of the third arc segment 3315, and the third arc segment 3316 is smaller than the radius of the third arc segment 3316. 15 is smaller than the radius of the fourth arc segment 3316, and the line connecting the center of the first arc segment 3313 and the center of the second arc segment 3314, the line connecting the center of the second arc segment 3314 and the center of the third arc segment 3315, the line connecting the center of the third arc segment 3315 and the center of the fourth arc segment 3316, and the line connecting the center of the fourth arc segment 3316 and the center of the first arc segment 3313 form a square.

[0039] By optimizing the inner wall profile 3310 of the volute, when the airflow is sucked into the interior of the volute 3000, the flow of the airflow is more uniform, and the flow losses such as eddy current, backflow and secondary flow are smaller. By reducing the flow losses of the airflow, the overall efficiency of the fan 1000 can be effectively improved. Moreover, smaller flow losses of the airflow will help reduce noise and energy consumption. When the volute 3000 is applied to the fan 1000, the suction effect of the fan 1000 can be greatly improved.

[0040] Specifically, the volute 3000 is described by taking the fan 1000 as an example. The fan 1000 includes a volute 3000 and an impeller 2000 (referring to a centrifugal impeller 2000). The impeller 2000 is rotatably mounted inside the volute 3000. The volute 3000 includes a front cover plate 3100, a rear cover plate 3200 and a shroud 3300. The shroud 3300 is arranged between the front cover plate 3100 and the rear cover plate 3200. The front cover plate 3100, the shroud 3300 and the rear cover plate 3200 enclose a certain space. The impeller 2000 is installed in the space between the front cover plate 3100 and the rear cover plate 3200. The front cover plate 3100 is provided with an air inlet 3110. The front cover plate 3100, the enclosure plate 3300 and the rear cover plate 3200 are provided with an air outlet 3400. The air outlet 3400 can be round or square. The rear cover plate 3200 is provided with a motor (not shown in the figure) for driving the impeller 2000 to rotate. When the motor rotates, it drives the airflow from the air inlet 3110 into the interior of the impeller 2000, and throws the airflow out so that the airflow is discharged from the air outlet 3400. For example, Figure 2 As shown, the front cover plate 3100, the enclosure plate 3300 and the rear cover plate 3200 are formed by splicing, the front cover plate 3100 and the enclosure plate 3300 intersect at 90°, the rear cover plate 3200 and the enclosure plate 3300 intersect at 90°, and the air outlet 3400 forms a square, or it can be, as shown in FIG. Figure 7 As shown, the front cover plate 3100, the enclosure plate 3300 and the rear cover plate 3200 are integrally cast, the front cover plate 3100 and the enclosure plate 3300 have rounded transitions, the rear cover plate 3200 and the enclosure plate 3300 have rounded transitions, and the air outlet 3400 is circular.

[0041] The main function of the volute 3000 is to collect the airflow leaving the impeller 2000 and guide it to the air outlet 3400. When the airflow flows inside the volute 3000, the volute inner wall profile 3310 plays a vital role. The volute inner wall profile 3310 constitutes a boundary that constrains the flow of airflow. For example, the inner wall contour of the shroud 3300 can be regarded as the volute inner wall profile 3310. After the airflow entering the impeller 2000 is thrown out, it flows to the air outlet 3400 under the constraint and guidance of the volute inner wall profile 3310. It can be understood that the volute inner wall profile 3310 is a complex curve, which has an important impact on the efficiency, noise, etc. of the fan 1000. For this reason, the volute inner wall profile 3310 is improved in this embodiment.

[0042] The first arc segment 3313, the second arc segment 3314, the third arc segment 3315 and the fourth arc segment 3316 are arranged along the spiral expansion direction of the volute inner wall profile 3310, for example Figure 1 The counterclockwise arrangement of the orientation shown (can also be as Figure 5 Clockwise as shown, you can also Figure 6The radius of the first arc segment 3313 is R1, the radius of the second arc segment 3314 is R2, the radius of the third arc segment 3315 is R3, and the radius of the fourth arc segment 3316 is R4, which needs to satisfy R1<R2<R3<R4, and the center of the first arc segment 3313 is O1, the center of the second arc segment 3314 is O2, the center of the third arc segment 3315 is O3, and the center of the fourth arc segment 3316 is O4, which needs to satisfy O1 and O2 The lines connecting O2 and O3, O3 and O4, and O4 and O1 form a square. By setting it in this way, the inner wall profile 3310 of the volute is similar to the Archimedean spiral. The optimization of the inner wall profile 3310 of the volute makes the airflow flow more evenly after leaving the impeller 2000, and can reduce the flow losses such as eddy current, backflow, and secondary flow during the airflow flow process. The airflow flow loss is smaller, which is beneficial to improving the overall efficiency of the fan 1000, thereby improving the suction effect. In addition, it is precisely because the airflow flows more evenly and the flow loss is smaller that the flow resistance is optimized, the noise generation is reduced, and the energy consumption is reduced.

[0043] Combination Figure 1 and Figure 3 As shown, in some embodiments of the present application, the volute 3000 is used for installing the impeller 2000 therein, wherein the diameter of the impeller 2000 is D, satisfying D=γ*100mm (mm, i.e., millimeter), the side length of the square formed by the centers of the first arc segment 3313, the second arc segment 3314, the third arc segment 3315 and the fourth arc segment 3316 is a, which needs to satisfy a=γ*4.8mm, and R1=γ*(57mm~59mm), R2=γ*(62mm~64mm), R3=γ*(67mm~69mm), R4=γ*(72mm~74mm), and γ needs to satisfy 4≤γ≤10 (the γ below also needs to satisfy this condition). It is understandable that the size parameters of the volute inner wall profile 3310 are also crucial. When the size parameters are too large, the overall size of the volute 3000 is too large, the space occupied is too large, and the material performance requirements of the volute 3000, the impeller 2000, etc. are relatively high. When the size parameters are too small, it is not conducive to large-scale suction. Based on a large number of analyses and experiments by the inventor, the size parameters of the volute inner wall profile 3310 are optimized so that the fan 1000 can be at the best performance.

[0044] For example, γ is 4, 6, 8 or 10, R1 is γ*57mm, γ*58mm or γ*59mm, R2 is γ*62mm, γ*63mm or γ*64mm, R3 is γ*67mm, γ*68mm or γ*69mm, and R4 is γ*72mm, γ*73mm or γ*74mm. When the value range of γ is 4 to 10, the corresponding diameter D of the impeller 2000 is in the range of 400mm to 1000mm, which is suitable for the use of sanitation vehicles. The sanitation vehicles have sufficient cleaning power, and the fan 1000 has high efficiency, low energy consumption and low noise.

[0045] Continue to combine Figure 1 As shown, in some embodiments of the present application, the volute inner wall profile 3310 also includes a first air outlet section 3311, a volute tongue section 3312 and a second air outlet section 3317. The first air outlet section 3311, the volute tongue section 3312, the first circular arc section 3313, the second circular arc section 3314, the third circular arc section 3315, the fourth circular arc section 3316 and the second air outlet section 3317 are arranged in sequence along the spiral expansion direction, and an air outlet 3400 is arranged between the first air outlet section 3311 and the second air outlet section 3317. Specifically, the volute tongue section 3312 is arranged close to the air outlet 3400. By setting the volute tongue section 3312, the formation of vortex is reduced, thereby avoiding the reduction of the overall efficiency of the fan 1000 and the increase of noise. Through the design of the first air outlet section 3311 and the second air outlet section 3317, the airflow can be rectified when it flows between the first air outlet section 3311 and the second air outlet section 3317, and the distribution of the airflow is more uniform, thereby reducing the noise at the air outlet 3400.

[0046] Further, continue to combine Figure 1 As shown, the distance between the first air outlet section 3311 and the second air outlet section 3317 is A, which satisfies A=γ*(32mm~34mm), for example, A is γ*32mm, γ*33mm or γ*34mm. It can be understood that the distance between the first air outlet section 3311 and the second air outlet section 3317 is the shortest distance between the first air outlet section 3311 and the second air outlet section 3317, for example, along Figure 1 The first direction measures the distance between the first air outlet section 3311 and the second air outlet section 3317. The first direction is the orientation of the first air outlet section 3311 and the second air outlet section 3317 toward each other. By optimizing the distance between the first air outlet section 3311 and the second air outlet section 3317, the optimization of the volute inner wall profile 3310 is better coordinated to ensure the flow channel cross-sectional area at this position and optimize the airflow resistance.

[0047] Further, continue to combine Figure 1As shown, the distance between the second air outlet section 3317 and the center of the volute 3000 (the center of the volute 3000 is the rotation center of the impeller 2000) along the first direction is B, satisfying B = γ*(73mm~77mm), the first direction is the orientation of the first air outlet section 3311 and the second air outlet section 3317, for example, B is γ*73mm, γ*75mm or γ*77mm. Generally speaking, the second air outlet section 3317 extends from the fourth arc section 3316, and by optimizing the distance between the second air outlet section 3317 and the center of the volute 3000 along the first direction, it is ensured that the second air outlet section 3317 and the fourth arc section 3316 are tangent, avoiding obstruction to the airflow at the intersection of the second air outlet section 3317 and the fourth arc section 3316.

[0048] Further, continue to combine Figure 1 As shown, the distance between the center of the air outlet 3400 and the volute 3000 along the second direction is C, satisfying C = γ*(70mm~80mm), and the second direction is the extension direction of the second air outlet section 3317, for example, C is γ*70mm, γ*72mm, γ*74mm, γ*76mm, γ*78mm or γ*80mm. As mentioned above, the airflow needs to be rectified when it flows between the first air outlet section 3311 and the second air outlet section 3317. By optimizing the length of the second air outlet section 3317, the second air outlet section 3317 has a more sufficient distance to constrain the airflow flow, so that the airflow flowing between the first air outlet section 3311 and the second air outlet section 3317 is fully rectified, further improving the overall efficiency of the fan 1000.

[0049] Further, continue to combine Figure 1 As shown, the radius of the volute tongue segment 3312 is r1, satisfying r1=γ*(4mm~4.5mm), for example, r1 is γ*4mm, γ*4.1mm, γ*4.2mm, γ*4.3mm, γ*4.4mm or γ*4.5mm. By optimizing r1, the noise generation can be further reduced.

[0050] Combination Figure 3 As shown, in some embodiments of the present application, the distance between the front cover plate 3100 of the volute 3000 and the rear cover plate 3200 of the volute 3000 is L, satisfying L=γ*(29mm~31mm), for example, L is γ*29mm, γ*30mm or γ*31mm. Compared with the traditional 9-26 type fan, the present embodiment widens the distance between the front cover plate 3100 and the rear cover plate 3200 by optimizing the distance, thereby reducing the air flow velocity inside the volute 3000, suppressing the dynamic pressure and eddy loss inside the volute 3000 and at the air outlet 3400, thereby further improving the overall efficiency of the fan 1000 and reducing noise.

[0051] Combination Figure 3As shown, in some embodiments of the present application, the volute 3000 includes a front cover plate 3100 and an air inlet sleeve 3500. The front cover plate 3100 is designed to be flat, and the front cover plate 3100 is provided with an air inlet 3110. The air inlet sleeve 3500 is inserted into the air inlet 3110, so as to be suitable for air flow to pass through, so that the air flow is sucked into the interior of the volute 3000. Through such a configuration, the formation of a recirculation zone between the inner side of the front cover plate 3100 and the air inlet sleeve 3500 is greatly weakened, thereby reducing the recirculation of the air flow between the inner side of the front cover plate 3100 and the air inlet sleeve 3500, thereby reducing the recirculation loss, increasing the air flow pressure, and further improving the overall efficiency of the fan 1000.

[0052] Specifically, as mentioned above, the volute 3000 includes a front cover plate 3100, a shroud plate 3300 and a rear cover plate 3200. The airflow enters the interior of the volute 3000 through the air inlet 3110 on the front cover plate 3100. By designing the front cover plate 3100 to be flat, when the air inlet sleeve 3500 is penetrated by the air inlet 3110 (for example, the air inlet sleeve 3500 and the edge of the air inlet 3110 are in contact), the angle formed between the front cover plate 3100 and the air inlet sleeve 3500 is close to 90°, which can reduce the area of ​​the reflow zone between the inner side of the front cover plate 3100 and the air inlet sleeve 3500, thereby reducing the reflow loss. It can be understood that in the related art, the front cover plate 3100 is non-flat and forms an arc at the air inlet 3110, so that the reflow zone formed by cooperating with the air inlet sleeve 3500 is large, thereby causing a large reflow loss.

[0053] Combination Figure 4 As shown, in some of the embodiments of the present application, along the axial direction of the air inlet sleeve 3500, the distance between the front cover plate 3100 and the impeller 2000 is K1, satisfying K1=γ*(5mm~6mm), for example, K1 is γ*5mm, γ*5.4mm, γ*5.8mm or γ*6mm. It can be understood that the distance K1 between the front cover plate 3100 and the impeller 2000 is the shortest distance. By optimizing K1, the area of ​​the recirculation zone can be weakened, the flow of airflow can be ensured, and the recirculation loss can be minimized.

[0054] Continue to combine Figure 4 As shown, in some embodiments of the present application, along the axial direction of the air inlet sleeve 3500, the length of the air inlet sleeve 3500 is K2, satisfying K2=γ*(10mm~12mm), for example, K2 is γ*10mm, γ*11mm or γ*12mm. By optimizing the length of the air inlet sleeve 3500, the airflow can have sufficient length for rectification when flowing through the air inlet sleeve 3500, and the airflow transmission is more uniform, so that the airflow entering the impeller 2000 is more stable, which is beneficial to improving the performance of the fan 1000.

[0055] In some embodiments of the present application, the air inlet sleeve 3500 has an inner end 3520 and an outer end 3510, the inner end 3520 is located inside the volute 3000, and the outer end 3510 is located outside the volute 3000, and the inner end 3520 extends into the inlet 2100 of the impeller 2000. It can be understood that as long as the inner end 3520 and the inlet 2100 of the impeller 2000 overlap, the inner end 3520 can be regarded as extending into the inlet 2100. By extending the inner end 3520 of the air inlet sleeve 3500 into the inlet 2100 of the impeller 2000, the airflow is prevented from leaking out from between the air inlet sleeve 3500 and the inlet 2100 of the impeller 2000 during the flow, thereby avoiding the increase of noise and energy consumption, and ensuring that the fan 1000 has a higher efficiency as a whole.

[0056] Furthermore, combined with Figure 4 As shown, along the radial direction of the air inlet sleeve 3500, the distance between the inner end 3520 of the air inlet sleeve 3500 and the edge of the inlet 2100 of the impeller 2000 is K3, satisfying K3 = γ * (0.5mm ~ 0.7mm), for example, K3 is γ * 0.5mm, γ * 0.6mm or γ * 0.7mm. It can be understood that the fan 1000 will vibrate when it is in operation. When the fan 1000 is applied to a sanitation vehicle, the vibration of the sanitation vehicle will also be transmitted to the fan 1000 and cause the fan 1000 to vibrate. When the fan 1000 is running, the air inlet sleeve 3500 is in a stationary state and the impeller 2000 is in a rotating state. By optimizing K3, in addition to preventing the airflow from leaking between the inner end 3520 of the air inlet sleeve 3500 and the edge of the inlet 2100 of the impeller 2000, interference between the air inlet sleeve 3500 and the impeller 2000 can also be avoided.

[0057] Furthermore, combined with Figure 4 As shown, along the direction from the outer end 3510 of the air inlet sleeve 3500 to the inner end 3520 of the air inlet sleeve 3500 (i.e., the axial direction of the air inlet sleeve 3500), the outer end 3510 of the air inlet sleeve 3500 is gradually reduced. By so doing, the resistance of the airflow when entering the air inlet sleeve 3500 can be reduced, and the airflow velocity can be accelerated, so that the airflow quickly reaches the impeller 2000, thereby improving the overall efficiency of the fan 1000. Furthermore, the outer end 3510 of the air inlet sleeve 3500 is gradually reduced in an arc shape, further reducing the wind resistance, making the airflow enter more smoothly, and reducing the airflow impact loss, thereby facilitating the improvement of the overall efficiency of the fan.

[0058] The second aspect of the present application discloses a fan 1000, Figure 1As shown, the fan 1000 includes an impeller 2000 and the above-mentioned volute 3000, the impeller 2000 is rotatably arranged inside the volute 3000, the volute 3000 has a volute inner wall profile 3310, and the volute inner wall profile 3310 includes a first arc segment 3313, a second arc segment 3314, a third arc segment 3315 and a fourth arc segment 3316 along the spiral expansion direction, the radius of the first arc segment 3313 is smaller than the radius of the second arc segment 3314, and the radius of the second arc segment 3314 is smaller than the radius of the second arc segment 3314. The diameter is smaller than the radius of the third arc segment 3315, the radius of the third arc segment 3315 is smaller than the radius of the fourth arc segment 3316, and the line connecting the center of the first arc segment 3313 and the center of the second arc segment 3314, the line connecting the center of the second arc segment 3314 and the center of the third arc segment 3315, the line connecting the center of the third arc segment 3315 and the center of the fourth arc segment 3316, and the line connecting the center of the fourth arc segment 3316 and the center of the first arc segment 3313 form a square.

[0059] By optimizing the inner wall profile 3310 of the volute, when the airflow is sucked into the interior of the volute 3000, the airflow flows more evenly, and the flow losses such as eddy current, backflow, and secondary flow are smaller. By reducing the flow loss of the airflow, the overall efficiency of the fan 1000 can be effectively improved. Moreover, the smaller flow loss of the airflow will be conducive to reducing noise and energy consumption. When the volute 3000 is applied to the fan 1000, the suction effect of the fan 1000 can be greatly improved. It can be understood that the volute 3000 of the fan 1000 of this embodiment adopts the technical solution of the above embodiment, and therefore at least has the beneficial effects brought by the technical solution of the above embodiment, which will not be repeated here.

[0060] In some embodiments of the present application, the impeller 2000 is a backward impeller 2000. By adopting the backward impeller 2000, the reaction force of the backward impeller 2000 is high, and the optimized volute inner wall profile 3310 is adapted, and the vortex, backflow and secondary flow loss inside the volute 3000 are further suppressed, thereby further improving the overall efficiency of the fan 1000 and reducing energy consumption and noise. In addition, by using the backward impeller 2000 in conjunction with the volute 3000 in the present application, when the fan 1000 is used in the medium and high speed section, the PQ characteristics (power-air volume) of the fan 1000 are further optimized, so that the PQ characteristics of the fan 1000 are more adapted to the airflow conveying system of the sanitation vehicle, thereby effectively improving the suction effect of the sanitation vehicle.

[0061] Based on the fan 1000 of the present application (the parameters with ranges take the middle values, such as R1=γ*(57mm~59mm), take R1=γ*58mm), the PQ standard bench test was carried out according to "GB / T 1236-2017 Standardized Air Duct Performance Test for Industrial Fans", and the results are as follows:

[0062]

[0063] The overall efficiency of the fan 1000 of the technical solution of the present application is ≥80%. In combination with Example 2 and Comparative Example 1, compared with the 9-26 type fan providing the same power (flow, pressure), the noise, energy consumption and shaft power of the technical solution of the present application are effectively reduced. Noise is, to a certain extent, energy loss (useless work). Through the fan 1000 of the present application, the efficiency can be effectively improved and the energy consumption can be reduced, thereby achieving active noise reduction.

[0064] The third aspect of the present application discloses a sanitation vehicle, which is a special vehicle used for urban appearance tidying and cleaning, integrating road sweeping, garbage collection and transportation. The sanitation vehicle includes the above-mentioned fan 1000, which includes a volute 3000 and an impeller 2000 rotatably arranged inside the volute 3000. When the fan 1000 is working, the airflow flows in from the air inlet 3110 of the volute 3000, works through the impeller 2000, and then is discharged from the air outlet 3400 of the volute 3000, so as to achieve the suction of garbage. It can be understood that the fan 1000 in this embodiment adopts the technical solution of the above-mentioned embodiment, so it at least has the beneficial effects brought by the technical solution of the above-mentioned embodiment, which will not be repeated here.

[0065] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made based on the concept of the present application and the contents of the present application description and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A volute (3000), characterized in that: The volute (3000) has a volute inner wall profile (3310), and the volute inner wall profile (3310) includes a first arc segment (3313), a second arc segment (3314), a third arc segment (3315) and a fourth arc segment (3316) along the spiral expansion direction, the radius of the first arc segment (3313) is R1 and the center is O1, the radius of the second arc segment (3314) is R2 and the center is O2, the radius of the third arc segment (3315) is R3 and the center is O3, the radius of the fourth arc segment (3316) is R4 and the center is O4, satisfying R1<R2<R3<R4, and the connecting line of O1 and O2, the connecting line of O2 and O3, the connecting line of O3 and O4, and the connecting line of O4 and O1 form a square.

2. The volute (3000) according to claim 1, characterized in that: The volute (3000) is suitable for installing an impeller (2000), the diameter of the impeller (2000) is D, satisfying D=γ*100mm; the side length of the square is a, satisfying a=γ*4.8mm; and R1=γ*(57mm~59mm), R2=γ*(62mm~64mm), R3=γ*(67mm~69mm), R4=γ*(72mm~74mm); wherein 4≤γ≤10.

3. The volute (3000) according to claim 2, characterized in that: The volute inner wall profile (3310) further comprises a first air outlet section (3311), a volute tongue section (3312) and a second air outlet section (3317); the first air outlet section (3311), the volute tongue section (3312), the first circular arc section (3313), the second circular arc section (3314), the third circular arc section (3315), the fourth circular arc section (3316) and the second air outlet section (3317) are arranged in sequence along a spiral expansion direction; an air outlet (3400) is provided between the first air outlet section (3311) and the second air outlet section (3317); The first air outlet section (3311) and the second air outlet section (3317) are separated by a distance A, satisfying A=γ*(32mm~34mm); and / or the second air outlet section (3317) and the center of the volute (3000) are separated by a distance B along a first direction, satisfying B=γ*(73mm~77mm), the first direction being the direction in which the first air outlet section (3311) and the second air outlet section (3317) are facing each other; and / or the air outlet (3400) and the center of the volute (3000) are separated by a distance C along a second direction, satisfying C=γ*(70mm~80mm), the second direction being the extension direction of the second air outlet section (3317); and / or the radius of the volute tongue section (3312) is r1, satisfying r1=γ*(4mm~4.5mm).

4. The volute (3000) according to claim 2, characterized in that: The volute (3000) comprises a front cover plate (3100) and a rear cover plate (3200) arranged alternately with the front cover plate (3100), the front cover plate (3100) is provided with an air inlet (3110), and the distance between the front cover plate (3100) and the rear cover plate (3200) is L, satisfying L=γ*(29mm~31mm).

5. The volute (3000) according to claim 1, characterized in that: The volute (3000) comprises: A front cover plate (3100), the front cover plate (3100) is in a flat plate shape and is provided with an air inlet (3110); and An air inlet sleeve (3500), wherein the air inlet sleeve (3500) is inserted into the air inlet (3110) and is suitable for allowing air flow to pass through.

6. The volute (3000) according to claim 5, characterized in that: The volute (3000) is suitable for installing an impeller (2000), and along the axial direction of the air inlet sleeve (3500), the distance between the front cover plate (3100) and the impeller (2000) is K1, satisfying K1=γ*(5mm~6mm), and 4≤γ≤10.

7. The volute (3000) according to claim 5, characterized in that: Along the axial direction of the air inlet sleeve (3500), the length of the air inlet sleeve (3500) is K2, satisfying K2=γ*(10mm-12mm), and 4≤γ≤10.

8. The volute (3000) according to claim 5, characterized in that: The volute (3000) is suitable for installing an impeller (2000), and the air inlet sleeve (3500) has an inner end (3520) and an outer end (3510), the inner end (3520) is located inside the volute (3000), and the outer end (3510) is located outside the volute (3000), and the inner end (3520) is suitable for extending into the inlet (2100) of the impeller (2000).

9. The volute (3000) according to claim 8, characterized in that: Along the radial direction of the air inlet sleeve (3500), the distance between the inner end (3520) and the edge of the inlet (2100) of the impeller (2000) is K3, satisfying K3=γ*(0.5mm~0.7mm), and 4≤γ≤10.

10. The volute (3000) according to claim 8, characterized in that: Along the axial direction of the air inlet sleeve (3500), the outer end (3510) is arranged to be tapered.

11. The volute (3000) according to claim 1, characterized in that: The volute (3000) comprises a front cover plate (3100), a surrounding plate (3300) and a rear cover plate (3200), wherein the front cover plate (3100) is provided with an air inlet (3110), the surrounding plate (3300) is arranged between the front cover plate (3100) and the rear cover plate (3200), and rounded corners are provided between the surrounding plate (3300) and the front cover plate (3100) and the rear cover plate (3200).

12. A fan (1000), characterized in that: The fan (1000) comprises an impeller (2000) and a volute (3000) according to any one of claims 1 to 11, and the impeller (2000) is rotatably disposed inside the volute (3000).

13. The fan (1000) according to claim 12, characterized in that: The impeller (2000) is a backward-facing impeller (2000).

14. A sanitation vehicle, characterized in that: The sanitation vehicle comprises the fan (1000) according to claim 12 or 13.

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