Air blower

Abstract

The invention relates to the technical field of air blowers, in particular to an air blower which comprises a volute and an impeller arranged in the volute, the volute comprises a front shell plate and a rear shell plate, the front shell plate is provided with an air inlet, and the front shell plate and the rear shell plate jointly define an air outlet; the impeller comprises a plurality of blades, a front cover disc and a rear cover disc, wherein the front cover disc and the rear cover disc are connected to the front sides and the rear sides of the blades. The molded line of the volute comprises a first diffusion section, a first arc section, a second arc section, a third arc section, a fourth arc section, a volute tongue section and a second diffusion section which are connected in sequence; the side, close to the center of the impeller, of each blade is the inner side, the side, away from the center of the impeller, of each blade is the outer side, the height of each blade is gradually reduced from inside to outside, the height H1 of the highest position of each blade ranges from 18.5 mm to 20.5 mm, and the height H2 of the lowest position of each blade ranges from 12mm to 16mm. By improving the volute molded line and the blades, gas can flow more smoothly in the volute, and the gas can have higher pressure energy when being discharged out of the volute.

Description

Technical Field

[0001] The present invention relates to the technical field of blowers, and in particular to a blower. Background Art

[0002] In commercial kitchen environments such as hotels, blowers are used to provide sufficient air volume to ensure a strong and stable flame and meet the high-intensity food preparation requirements of commercial kitchens. Among them, the volute and impeller, as the core components of the blower, play a decisive role in the generation of air volume and wind pressure. However, in existing blowers, when the gas enters the volute, due to the unreasonable change in the curvature of the inner wall of the volute, the airflow cannot flow smoothly along the volute, but forms vortices in local areas, resulting in energy loss, which cannot be effectively converted into air volume and wind pressure, making it impossible for the gas to obtain sufficient acceleration and pressurization when flowing through the impeller, thereby affecting the increase in air volume and wind pressure. To this end, it is necessary to improve the existing technology to solve the above problems. Summary of the invention

[0003] The object of the present invention is to provide a blower, aiming to solve the problem in the prior art that the gas cannot obtain sufficient acceleration and pressurization when flowing through the impeller due to unreasonable curvature change of the inner wall of the volute.

[0004] In order to achieve the above-mentioned object, the present invention provides a blower, comprising a volute and an impeller arranged in the volute, the volute comprising a front shell plate and a rear shell plate, the front shell plate is provided with an air inlet, and the front shell plate and the rear shell plate together form an air outlet; the impeller comprises a plurality of blades and a front cover plate and a rear cover plate connected to the front and rear sides of the plurality of blades, and the middle part of the front cover plate is provided with an air suction port; The profile of the volute includes a first diffuser section, a first arc section, a second arc section, a third arc section, a fourth arc section, a volute tongue section and a second diffuser section connected in sequence; a rectangular coordinate system is established with the center of the impeller as the coordinate origin O, when the first diffuser section is located in the second quadrant and parallel to the X-axis, the first arc section is tangent to the first diffuser section, the coordinates of the center O1 of the first arc section are (-4.5mm, 4.5mm), the radius R1 is 100mm-105mm, and the center angle ∠1 is 89°-91°, the coordinates of the center O2 of the second arc section are (4.5mm, 4.5mm), the radius R2 is 90mm-100mm, and the center angle ∠2 is 89°-91°, the coordinates of the center O3 of the third arc section are (4.5mm, -4.5mm), the radius R3 is 80mm-90mm, and the center angle ∠3 is 89°-91°, the coordinates of the center O4 of the fourth arc segment are (-4.5mm, -4.5mm), the radius R4 is 70mm-80mm, and the central angle ∠4 is 33°-34°; the second diffuser section is located in the second quadrant and is parallel to the X-axis, the second diffuser section and the fourth arc segment are tangent to the two ends of the volute tongue section respectively; the volute tongue section is arc-shaped and the radius R5 is 6mm-10mm; the side of the blade close to the center of the impeller is the inner side, and the side of the blade away from the center of the impeller is the outer side, the height of the blade gradually decreases from the inside to the outside, the height H1 of the highest point of the blade is 18.5mm-20.5mm, and the height H2 of the lowest point of the blade is 12mm-16mm; the radial distance D1 between the impeller and the volute tongue section is 8.5mm-10.5mm, the blade is backward curved, and the number of blades is 10-14.

[0005] Furthermore, the outermost ends of the air outlet edges of the multiple blades form a blade outer periphery, and the radius R6 of the blade outer periphery is 66mm-68mm. The innermost ends of the air inlet edges of the multiple blades form a blade inner periphery, and the radius R7 of the blade inner periphery is 30mm-35mm. The projection of the blade on the rear cover is arc-shaped and the radius R8 is 35mm-45mm; the blade inlet angle ∠5 is 105°-115°, and the blade outlet angle ∠6 is 30°-40°.

[0006] Furthermore, the wind inlet edge and the wind outlet edge of the blade are both perpendicular to the rear cover plate, and the radius R9 of the rear cover plate is 68mm-70mm.

[0007] Furthermore, the impeller is cut with a plane passing through the central axis of the impeller. In the cross section, the included angle ∠7 between the front cover disc and the rear cover disc is 7°-11°.

[0008] Furthermore, the distance D2 between the front shell plate and the rear shell plate is 35 mm-45 mm; the distance D3 between the rear cover plate and the rear shell plate is 8 mm-10 mm.

[0009] Furthermore, the air suction port protrudes toward the air inlet relative to the front cover plate, the protruding height H3 is 4mm-8mm, and the transition between the protruding part and the front cover plate adopts a chamfer with a radius R10 of 2mm-4mm, and the radius R11 of the air suction port is 25mm-35mm; the air inlet protrudes away from the air suction port relative to the front shell plate, the protruding height H4 is 2.5mm-4.5mm, and the angle ∠8 formed between the air inlet and the front shell plate is 40°-50°.

[0010] Furthermore, the height H5 of the air outlet is 56 mm-60 mm.

[0011] Furthermore, the length L1 of the first diffuser section is 85 mm-95 mm, and the length L2 of the second diffuser section is 15 mm-25 mm.

[0012] Compared with the prior art, the blower provided by the present invention can make the flow of gas in the volute smoother by improving the volute profile and blades, guide the airflow to flow in a more reasonable path, reduce airflow separation and vortex phenomena, reduce energy loss, and help the gas have higher pressure energy when it is discharged from the volute. When the gas enters the smoke exhaust pipe, the above-given parameters such as the volute, volute profile and blades can make the flow of the airflow in the volute fit the inner wall of the volute more closely, and can convert more gas kinetic energy into pressure energy, thereby significantly increasing the air volume and wind pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 is an exploded view of the present invention; Figure 3 is a cross-sectional view of the present invention; Figure 4 yes Figure 3 A schematic diagram of the enlarged structure of part A; Figure 5 It is a structural diagram of the volute profile; Figure 6 It is a schematic diagram of the structure of the volute and the impeller; Figure 7 It is a schematic diagram of the structure of the impeller hidden front cover; Figure 8 It is a schematic diagram of the structure of the blade.

[0014] Description of reference numerals: 1. volute; 11. front shell plate; 12. rear shell plate; 13. air inlet; 14. air outlet; 151. first diffuser section; 152. first arc section; 153. second arc section; 154. third arc section; 155. fourth arc section; 156. volute tongue section; 157. second diffuser section; 2. Impeller; 21. Blades; 22. Front cover plate; 23. Rear cover plate; 24. Air inlet; 25. Air inlet edge; 26. Air outlet edge. DETAILED DESCRIPTION

[0015] The present invention is described in detail below in conjunction with specific embodiments.

[0016] In the present invention, unless otherwise clearly specified and limited, when terms such as "set on", "connected", and "connected" appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or connected through one or more intermediate media. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The directional words that appear in the present invention are to better illustrate the characteristics of the features and the relationship between the features. It should be understood that when the placement direction of the present invention changes, the characteristics of the features and the direction of the relationship between the features also change accordingly. Therefore, the directional words do not constitute an absolute limitation on the characteristics of the features and the relationship between the features in space, but only play a relative limitation role.

[0017] The present invention provides a blower, such as Figure 1 to Figure 2 As shown, it includes a volute 1 and an impeller 2 arranged in the volute 1, the volute 1 includes a front shell plate 11 and a rear shell plate 12, the front shell plate 11 is provided with an air inlet 13, and the front shell plate 11 and the rear shell plate 12 together form an air outlet 14; the impeller 2 includes a plurality of blades 21 and a front cover plate 22 and a rear cover plate 23 connected to the front and rear sides of the plurality of blades 21, and the middle part of the front cover plate 22 is provided with an air suction port 24; like Figure 5As shown, the profile of the volute 1 includes a first diffuser section 151, a first arc section 152, a second arc section 153, a third arc section 154, a fourth arc section 155, a volute tongue section 156 and a second diffuser section 157 connected in sequence; a rectangular coordinate system is established with the center of the impeller 2 as the coordinate origin O. When the first diffuser section 151 is located in the second quadrant and parallel to the X-axis, the first arc section 152 is tangent to the first diffuser section 151, the center O1 coordinates of the first arc section 152 are (-4.5mm, 4.5mm), the radius R1 is 100mm-105mm, the center angle ∠1 is 89°-91°, and the center O2 coordinates of the second arc section 153 are (4.5mm, 4.5mm ), the radius R2 is 90mm-100mm, the center angle ∠2 is 89°-91°, the coordinates of the center O3 of the third arc segment 154 are (4.5mm, -4.5mm), the radius R3 is 80mm-90mm, the center angle ∠3 is 89°-91°, the coordinates of the center O4 of the fourth arc segment 155 are (-4.5mm, -4.5mm), the radius R4 is 70mm-80mm, and the center angle ∠4 is 33°-34°; the second diffuser section 157 is located in the second quadrant and is parallel to the X-axis, the second diffuser section 157 and the fourth arc segment 155 are tangent to the two ends of the volute tongue section 156 respectively; the volute tongue section 156 is arc-shaped and the radius R5 is 6mm-10mm.

[0018] Preferably, the coordinates of the center O1 of the first arc segment 152 are (-4.5mm, 4.5mm), the radius R1 is 103.5mm, and the central angle ∠1 is 90°; the coordinates of the center O2 of the second arc segment 153 are (4.5mm, 4.5mm), the radius R2 is 94.5mm, and the central angle ∠2 is 90°; the coordinates of the center O3 of the third arc segment 154 are (4.5mm, -4.5mm), the radius R3 is 85.5mm, and the central angle ∠3 is 90°; the coordinates of the center O4 of the fourth arc segment 155 are (-4.5mm, -4.5mm), the radius R4 is 76.5mm, and the central angle ∠4 is 33.5°; the volute tongue segment 156 is arc-shaped and the radius R5 is 8mm.

[0019] like Figure 8 As shown, the side of the blade 21 close to the center of the impeller 2 is the inner side, and the side of the blade 21 away from the center of the impeller 2 is the outer side. The height of the blade 21 gradually decreases from the inside to the outside. The height H1 of the highest point of the blade 21 is 18.5mm-20.5mm, preferably, H1 is 19.8mm, and the height H2 of the lowest point of the blade 21 is 12mm-16mm, preferably, H2 is 14.2mm.

[0020] like Figure 6As shown, the radial distance D1 between the impeller 2 and the volute tongue section 156 is 8.5 mm-10.5 mm, preferably, D1 is 9.5 mm. The above parameter settings are helpful to enhance the anti-static pressure capability of the blower and improve the efficiency of the blower.

[0021] like Figure 7 As shown, the blades 21 are backward curved, and the number of blades 21 is 10-14, preferably, the number of blades 21 is 12. By setting a suitable number of blades 21, the flow state of the airflow in the flow channel of the impeller 2 can be optimized and energy loss can be reduced.

[0022] Based on the above structural setting, by improving the volute 1 profile and the blades 21, the gas can flow more smoothly in the volute 1, guide the airflow to flow in a more reasonable path, reduce airflow separation and vortex phenomena, reduce energy loss, and help the gas to have higher pressure energy when it is discharged from the volute. When the gas enters the smoke exhaust pipe, the parameters such as the volute, volute profile and blades given in this embodiment can make the airflow in the volute 1 more closely fit the inner wall of the volute 1, and can convert more gas kinetic energy into pressure energy, thereby significantly increasing the air volume and wind pressure.

[0023] like Figure 7 As shown, in this embodiment, the outermost ends of the outlet edges 26 of the multiple blades 21 form the outer periphery of the blades, and the radius R6 of the outer periphery of the blades is 66mm-68mm, preferably, R6 is 67.5mm; the innermost ends of the inlet edges 25 of the multiple blades 21 form the inner periphery of the blades, and the radius R7 of the inner periphery of the blades is 30mm-35mm, preferably, R7 is 32.5mm; the projection of the blades 21 on the rear cover plate 23 is arc-shaped and the radius R8 is 35mm-45mm, preferably, R8 is 40mm; the inlet angle ∠5 of the blades 21 is 105°-115°, preferably, ∠5 is 110°; the outlet angle ∠6 of the blades 21 is 30°-40°, preferably, ∠6 is 35°.

[0024] like Figure 7 As shown, in this embodiment, the wind inlet edge 25 and the wind outlet edge 26 of the blade 21 are both perpendicular to the rear cover plate 23, and the radius R9 of the rear cover plate 23 is 68 mm-70 mm, preferably, R9 is 68.5 mm.

[0025] like Figure 3 As shown, in this embodiment, the impeller 2 is cut with a plane passing through the central axis of the impeller 2. In the cross section, the angle ∠7 between the front cover plate 22 and the rear cover plate 23 is 7°-11°, preferably, ∠7 is 9°.

[0026] Through the above technical scheme, the improvement of the impeller 2 can increase the contact area and action time between the gas and the blades 21, thereby inhaling more gas; at the same time, the high-speed rotation of the impeller 2 can make the gas in the flow channel of the impeller 2 more fully accelerated and pressurized, more effectively push the gas, ensure that the gas can be discharged smoothly, and further increase the air volume and wind pressure.

[0027] like Figure 3 As shown, in this embodiment, the distance D2 between the front shell plate 11 and the rear shell plate 12 is 35mm-45mm, preferably, D2 is 40mm; the distance D3 between the rear cover plate 23 and the rear shell plate 12 is 8mm-10mm, preferably, D3 is 9mm.

[0028] like Figure 4 As shown, in the present embodiment, the air suction port 24 protrudes toward the air inlet 13 relative to the front cover plate 22, and the protruding height H3 is 4mm-8mm, preferably, H3 is 6mm; the transition between the protruding portion and the front cover plate 22 adopts a chamfer with a radius R10 of 2mm-4mm, preferably, R10 is 3mm; the radius R11 of the air suction port 24 is 25mm-35mm, preferably, R11 is 30.5mm; the air inlet 13 protrudes away from the air suction port 24 relative to the front shell plate 11, and the protruding height H4 is 2.5mm-4.5mm, preferably, H4 is 3.5mm; the angle ∠8 formed between the air inlet 13 and the front shell plate 11 is 40°-50°, preferably, ∠8 is 45°. By optimizing the design of the air inlet 13 and the air suction port 24, the gas can enter the impeller 2 area more smoothly, thereby improving the air intake efficiency and air suction efficiency of the blower, and increasing the air volume and air pressure.

[0029] like Figure 5 As shown, in this embodiment, the height H5 of the air outlet 14 is 56 mm-60 mm, preferably, H5 is 58 mm.

[0030] like Figure 5 As shown, in this embodiment, the length L1 of the first diffuser section 151 is 85 mm-95 mm, preferably, L1 is 91 mm; the length L2 of the second diffuser section 157 is 15 mm-25 mm, preferably, L2 is 20.5 mm.

[0031] By adjusting the height and length of the air outlet 14, the resistance of the gas at the outlet can be reduced and the gas discharge efficiency can be improved.

[0032] Test comparison: The comparative example is a 120W kitchen fan produced by Guangdong Yongcheng Electromechanical Technology Co., Ltd.; the improved example adopts the preferred parameters provided in this embodiment.

[0033] The comparative example and the improved example were tested using the same motor and test conditions, and the key test data were shown in Table 1: Table 1

[0034] By comparison, the improved example has improvements in flow rate, pressure and efficiency compared with the control example.

[0035] In summary, this type of blower can solve the problem in the prior art that the gas cannot obtain sufficient acceleration and pressurization when flowing through the impeller due to unreasonable curvature change of the inner wall of the volute.

[0036] In the absence of conflict, the above-mentioned embodiments and features thereof may be combined with each other.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A blower, comprising a volute (1) and an impeller (2) arranged in the volute (1), the volute (1) comprising a front shell plate (11) and a rear shell plate (12), the front shell plate (11) being provided with an air inlet (13), the front shell plate (11) and the rear shell plate (12) jointly forming an air outlet (14); the impeller (2) comprising a plurality of blades (21) and a front cover plate (22) and a rear cover plate (23) connected to the front and rear sides of the plurality of blades (21), the middle portion of the front cover plate (22) being provided with an air suction port (24), characterized in that: The profile of the volute (1) comprises a first diffuser section (151), a first arc section (152), a second arc section (153), a third arc section (154), a fourth arc section (155), a volute tongue section (156) and a second diffuser section (157) which are connected in sequence; a rectangular coordinate system is established with the center of the impeller (2) as the coordinate origin O; when the first diffuser section (151) is located in the second quadrant and is parallel to the X-axis, the first arc section (152) is tangent to the first diffuser section (151); the coordinates of the center O1 of the first arc section (152) are (-4.5 mm, 4.5 mm), the radius R1 is 100 mm-105 mm, and the center angle ∠1 is 89°-9 1°, the center O2 coordinates of the second arc segment (153) are (4.5mm, 4.5mm), the radius R2 is 90mm-100mm, and the center angle ∠2 is 89°-91°, the center O3 coordinates of the third arc segment (154) are (4.5mm, -4.5mm), the radius R3 is 80mm-90mm, and the center angle ∠3 is 89°-91°, the center O4 coordinates of the fourth arc segment (155) are (-4.5mm, -4.5mm), the radius R4 is 70mm-80mm, and the center angle ∠4 is 33°-34°; the second diffuser section (157) is located in the second quadrant and is parallel to the X-axis, and the second diffuser section (157) and the fourth arc segment (155) are tangent to two ends of the volute tongue segment (156) respectively; the volute tongue segment (156) is arc-shaped and has a radius R5 of 6 mm to 10 mm; The side of the blade (21) close to the center of the impeller (2) is the inner side, and the side of the blade (21) far from the center of the impeller (2) is the outer side. The height of the blade (21) gradually decreases from the inside to the outside. The height H1 of the highest point of the blade (21) is 18.5 mm to 20.5 mm, and the height H2 of the lowest point of the blade (21) is 12 mm to 16 mm. The radial distance D1 between the impeller (2) and the volute tongue section (156) is 8.5 mm to 10.5 mm, the blades (21) are backward curved, and the number of blades (21) is 10 to 14.

2. The blower according to claim 1, characterized in that: The outermost ends of the air outlet edges (26) of the plurality of blades (21) form a blade outer periphery, and the radius R6 of the blade outer periphery is 66 mm-68 mm. The innermost ends of the air inlet edges (25) of the plurality of blades (21) form a blade inner periphery, and the radius R7 of the blade inner periphery is 30 mm-35 mm. The projection of the blade (21) on the rear cover plate (23) is in an arc shape, and the radius R8 is 35 mm-45 mm. The inlet angle ∠5 of the blade (21) is 105°-115°, and the outlet angle ∠6 of the blade (21) is 30°-40°.

3. The blower according to claim 2, characterized in that: The wind inlet edge (25) and the wind outlet edge (26) of the blade (21) are both perpendicular to the rear cover plate (23), and the radius R9 of the rear cover plate (23) is 68 mm-70 mm.

4. The blower according to claim 1, characterized in that: The impeller (2) is cut with a plane passing through the central axis of the impeller (2). In the cross section, the angle ∠7 between the front cover disc (22) and the rear cover disc (23) is 7°-11°.

5. The blower according to claim 1, characterized in that: The distance D2 between the front shell plate (11) and the rear shell plate (12) is 35 mm to 45 mm; the distance D3 between the rear cover plate (23) and the rear shell plate (12) is 8 mm to 10 mm.

6. The blower according to claim 5, characterized in that: The air suction port (24) protrudes relative to the front cover plate (22) toward the air inlet (13), the protruding height H3 is 4mm-8mm, and the transition between the protruding portion and the front cover plate (22) adopts a rounded corner with a radius R10 of 2mm-4mm, and the radius R11 of the air suction port (24) is 25mm-35mm; the air inlet (13) protrudes relative to the front shell plate (11) in a direction away from the air suction port (24), the protruding height H4 is 2.5mm-4.5mm, and the angle ∠8 formed between the air inlet (13) and the front shell plate (11) is 40°-50°.

7. The blower according to claim 1, characterized in that: The height H5 of the air outlet (14) is 56 mm-60 mm.

8. The blower according to claim 1, characterized in that: The length L1 of the first diffuser section (151) is 85 mm to 95 mm, and the length L2 of the second diffuser section (157) is 15 mm to 25 mm.

Images