High-speed centrifugal fan

Abstract

The utility model provides a high-speed centrifugal fan, which relates to the technical field of centrifugal fans and comprises a motor, a volute, an impeller and a first separator. Wherein the front end of the motor is provided with a front end cover, an output shaft of the motor rotates, and the shaft penetrates through the front end cover; the volute is arranged at one end of the front end cover away from the motor body; the impeller is fixedly arranged on the output shaft in a matched mode and located in a volute chamber defined by the front end cover and the volute. The first separator is located between the front end cover and the impeller and used for preventing the output shaft and the impeller from rubbing the front end cover when the output shaft deviates from the rotation center. Thus, in the working process, even if the output shaft deviates from the rotation center due to damage of the bearing or other elements, sparks cannot be generated between the output shaft and the shaft hole of the front end cover and / or between the impeller and the front end cover due to the friction phenomenon, and even the anti-explosion motor has the advantage of being high in anti-explosion performance.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to high-speed centrifugal fans. Background Art

[0002] A high-speed centrifugal fan refers to a device that drives an impeller to rotate at a high speed through a motor to generate centrifugal force, and sucks air or gas from the air inlet under the action of pressure difference, and discharges it through the air outlet after the action of the impeller. Due to its ability to provide a large air flow, high-speed centrifugal fans have been widely used in various occasions requiring ventilation, exhaust and circulation systems.

[0003] Existing high-speed centrifugal fans usually include a motor, a volute casing covering the front end cover of the motor, and a turbine fixedly arranged on the output shaft of the motor. Usually, the front end cover and the volute casing of the motor are formed by casting with materials such as aluminum alloy. During operation, if the bearing supporting the output shaft is damaged, the rotation center of the output shaft will shift, resulting in friction between the output shaft and the shaft hole of the front end cover, the impeller and the front end cover, or the impeller and the inner wall of the volute casing, generating sparks, and further causing an explosion of the high-speed centrifugal fan, presenting certain safety hazards.

[0004] Therefore, a high-speed centrifugal fan with high explosion-proof performance needs to be designed. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a high-speed centrifugal fan aiming at the defects and deficiencies of the prior art, which can at least solve one of the above technical problems and has the advantage of high explosion-proof performance.

[0006] To achieve the above purpose, the utility model provides a high-speed centrifugal fan, comprising:

[0007] A motor having a front end cover at the front, and an output shaft thereof rotates and passes through the front end cover axially;

[0008] A volute casing arranged at one end of the front end cover away from the motor body;

[0009] An impeller fixedly arranged on the output shaft and located in the volute chamber surrounded by the front end cover and the volute casing;

[0010] A first isolation member located between the front end cover and the impeller, and used for blocking the friction between the output shaft and the impeller against the front end cover when the output shaft deviates from the rotation center.

[0011] Optionally, the first isolation member is a copper isolation disc, and the distance between the copper isolation disc and the impeller is greater than 0 mm and less than or equal to 7 mm.

[0012] Optionally, the copper isolation disc is fixedly arranged on the surface of the front end cover, coaxially arranged with the front end cover, and the aperture diameter of the shaft hole of the copper isolation disc is smaller than that of the shaft hole of the front end cover.

[0013] Optionally, the outer diameter of the copper isolation disc is greater than or equal to the outer diameter of the impeller.

[0014] Optionally, one side of the front end cover facing the impeller has an annular groove, and the copper isolation disc is fixedly arranged in the annular groove through a fastener.

[0015] Optionally, the high-speed centrifugal fan further includes a second isolation member arranged in the volute chamber of the volute and located between the impeller and the volute, for blocking the impeller from rubbing against the inner wall of the volute when the output shaft deviates from the rotation center.

[0016] Optionally, the second isolation member is a copper isolation ring fixedly arranged on the inner wall of the volute and arranged around the outer side of the blades of the impeller.

[0017] Optionally, the distance between the copper isolation ring and the outer edge of the impeller blades is greater than 0 mm and less than or equal to 7 mm.

[0018] Optionally, the impeller includes a hub, and a first blade and a second blade arranged around the outer peripheral surface of the hub; the outer diameter of the hub gradually decreases from one end close to the first isolation member to the end far from the first isolation member; the first blade and the second blade are arranged at intervals, and the length of the first blade along the axial direction of the hub is less than the length of the second blade along the axial direction of the hub.

[0019] Optionally, the projections of the first blade and the second blade on the circumferential surface of the hub are both in a spiral shape.

[0020] Compared with the prior art, the advantages of the present application are as follows:

[0021] Since a first isolation member that can block the output shaft and the impeller from rubbing against the front end cover is arranged between the front end cover of the motor and the impeller when the output shaft of the high-speed centrifugal fan deviates from the rotation center. Thus, during operation, even if the output shaft deviates from the rotation center due to damage of the bearing or other components, there will be no spark generated due to friction between the output shaft and the shaft hole of the front end cover, and / or between the impeller and the front end cover, which has the advantage of high explosion-proof performance. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0023] Figure 1 Structural schematic diagram of an embodiment of the present invention;

[0024] Figure 2 Top view structural schematic diagram of an embodiment of the present invention;

[0025] Figure 3 For Figure 2 Schematic cross-sectional view along line A-A in

[0026] Figure 4 Exploded structural schematic diagram of a part of the present invention from one perspective;

[0027] Figure 5 Exploded structural schematic diagram of a part of the present invention from another perspective;

[0028] Figure 6 Structural schematic diagram of the impeller of an embodiment of the present invention.

[0029] Explanation of reference numerals

[0030] 100 - High-speed centrifugal fan;

[0031] 1 - Motor; 11 - Motor main body; 12 - Front end cover; 13 - Output shaft; a - Annular groove;

[0032] 2 - Volute; 21 - Inlet collector; 22 - Air duct; c - Volute chamber; d - Step-shaped assembly groove;

[0033] 3 - Impeller; 31 - Hub; 32 - Blades; 321 - First blade; 322 - Second blade; o2 - Assembly hole; e - Air flow channel; f - Blade outer edge.

[0034] 4 - Copper isolation disc;

[0035] 5 - Copper isolation ring. Detailed implementation manners

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0037] It should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "back", "side", "circumferential", etc. of the present utility model indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, words such as first and second are only used to distinguish multiple components or structures with the same or similar structures, and do not represent a special limitation on the setting order or connection relationship.

[0038] Please refer to Figures 1 to 6 , the embodiments of the present utility model provide a high-speed centrifugal fan 100, including: a motor 1, a volute 2, an impeller 3 and a first isolation member. Among them, the motor 1 includes a motor main body 11. The front end of the motor 1 has a front end cover 12, and the output shaft 13 of the motor 1 rotates and passes through the front end cover 12 axially. Specifically, the front end cover 12 has a shaft hole o1, and the output shaft 13 is rotatably arranged in the motor main body 11 through a bearing (not shown in the figure) and passes out through the shaft hole o1 of the front end cover 12. The volute 2 is arranged at one end of the front end cover 12 away from the motor main body 11. Optionally, the volute 2 can be assembled to one end of the front end cover 12 away from the motor main body 11 through a fastener (not shown in the figure). Optionally, the volute 2 includes a collector 21 arranged on the side away from the motor main body 11 and coaxially arranged with the output shaft 13, and a spiral air duct 22. Specifically, the volute 2 is a prior art, so it will not be elaborated here. The impeller 3 is fixedly arranged on the output shaft 13 and is located in a volute chamber c surrounded by the front end cover 12 and the volute 2. The first isolation member is located between the front end cover 12 and the impeller 3 and is used to block the output shaft 13 and the impeller 3 from rubbing against the front end cover 12 when the output shaft 13 deviates from the rotation center.

[0039] Since the high-speed centrifugal fan 100 is provided with a first isolation member between the front end cover 12 of the motor 1 and the impeller 3, when the output shaft 13 deviates from the rotation center, it can prevent the output shaft 13 and the impeller 3 from rubbing against the front end cover 12. Thus, during operation, even if the output shaft 13 deviates from the rotation center due to damage to the bearing or other components, there will be no spark generated due to friction between the output shaft 13 and the shaft hole o1 of the front end cover 12, and / or between the impeller 3 and the front end cover 12, even though it has the advantage of high explosion-proof performance.

[0040] Optionally, please refer to Figures 3 to 5 , in this embodiment, the first isolation member is a copper isolation disc 4. The distance between the copper isolation disc 4 and the impeller 3 is greater than 0 mm and less than or equal to 7 mm. Since copper has a relatively low hardness and is relatively soft, it has good yielding properties when rubbed or impacted by the output shaft 13 and / or the impeller 3, and it is not easy to peel off tiny metal particles; in addition, copper has good thermal conductivity, and the heat generated when the output shaft 13 and / or the impeller 3 are rubbed or impacted can be absorbed and conducted in a timely manner, further reducing the shedding of particles; thus, it is very difficult for the copper isolation disc 4 to reach the condition of generating sparks during friction. Specifically, in this embodiment, the distance between the copper isolation disc 4 and the impeller 3 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm. Of course, in some other embodiments, the distance between the copper isolation disc 4 and the impeller 3 can be 0.5 mm, 1.5 mm, 2.5 mm, 3.5 mm, 4.55 mm, 5.5 mm, 6.5 mm. As long as the distance between the copper isolation disc 4 and the impeller 3 is greater than 0 mm and less than or equal to 7 mm.

[0041] Optionally, please refer to Figure 4 and Figure 5 , in this embodiment, the copper isolation disc 4 is fixedly arranged on the surface of the front end cover 12. Specifically, it can be assembled and fixed on the surface of the front end cover 12 through fasteners (not shown in the figure). The copper isolation disc 4 is coaxially arranged with the front end cover 12, and the inner diameter of the shaft hole o3 of the copper isolation disc 4 is smaller than the inner diameter of the shaft hole o1 of the front end cover 12. Since the inner diameter of the shaft hole o3 of the copper isolation disc 4 is smaller than the inner diameter of the shaft hole o1 of the front end cover 12, and the copper isolation disc 4 is located at the front of the front end cover 12, when the output shaft 13 deviates from the rotation center, the output shaft 13 will rub against the shaft hole o3 of the copper isolation disc 4 instead of rubbing against the shaft hole o1 of the front end cover 12, thus preventing the output shaft 13 from rubbing against the front end cover 12.

[0042] In order to prevent the copper isolation disc 4 from preventing the impeller 3 from rubbing against the front end cover 12 when the output shaft 13 deviates from the rotation center. Optionally, please refer to Figure 5 , in this embodiment, the outer diameter of the copper isolation disc 4 is greater than or equal to the outer diameter of the impeller 3.

[0043] To improve the compactness of the high-speed centrifugal fan 100, optionally, please refer to Figure 4 , in this embodiment, the side of the front end cover 12 facing the impeller 3 has an annular groove a, and the copper isolation disc 4 is fixedly arranged in the annular groove a through a fastener (not shown in the figure). Of course, in some other embodiments, the copper isolation disc 4 can also be assembled in the annular groove a by snap connection, and no specific limitation is made here.

[0044] To avoid the situation that during operation, the rotation center of the output shaft 13 shifts, and the impeller 3 rubs against the inner wall of the volute 2 to generate sparks, which may further cause the explosion of the high-speed centrifugal fan 100. Optionally, please refer to Figures 3 to 5 , in this embodiment, the high-speed centrifugal fan 100 further includes a second isolation member. The second isolation member is arranged in the volute chamber of the volute 2 and located between the impeller 3 and the volute 2, and is used to block the impeller 3 from rubbing against the inner wall of the volute 2 when the output shaft 13 deviates from the rotation center. In this way, during operation, even if the output shaft 13 deviates from the rotation center due to the damage of the bearing or other components, the impeller 3 and the inner wall of the volute 2 will not generate sparks due to the friction phenomenon, thus further improving the explosion-proof performance of the high-speed centrifugal fan 100.

[0045] Optionally, please refer to Figure 4 and Figure 5 , in this embodiment, the second isolation member is a copper isolation ring 5; the copper isolation ring 5 is fixedly arranged on the inner wall of the volute 2 and is arranged around the outside of the blades 32 of the impeller 3. Optionally, the inner wall of the volute 2 has a stepped assembly groove d, and the copper isolation ring 5 is assembled in the stepped assembly groove d through a fastener. Since the hardness of copper is relatively low and the texture is relatively soft, it has good yielding property when the blades 32 of the impeller 3 rub or impact, and it is not easy to peel off tiny metal particles; in addition, copper has good thermal conductivity, and the heat generated when the blades 32 of the impeller 3 rub or impact can be absorbed and conducted in time, further reducing the shedding of particles; thus, it is very difficult for the copper isolation ring 5 to reach the condition of generating sparks during friction.

[0046] Optionally, please refer to Figures 4 to 6 , in this embodiment, the distance between the copper isolation ring 5 and the outer edge f of the blades of the impeller 3 is greater than 0 mm and less than or equal to 7 mm. Optionally, the distance between the copper isolation ring 5 and the outer edge f of the blades of the impeller 3 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm. Of course, in some other embodiments, the distance between the copper isolation ring 5 and the outer edge f of the blades of the impeller 3 can be 0.5 mm, 1.5 mm, 2.5 mm, 3.5 mm, 4.55 mm, 5.5 mm, 6.5 mm. As long as the distance between the copper isolation ring 5 and the outer edge f of the blades of the impeller 3 is greater than 0 mm and less than or equal to 7 mm.

[0047] To improve the performance and efficiency of the high-speed centrifugal fan 100 and increase the wind force under the same power, optionally, please refer to Figure 6 , in this embodiment, the impeller 3 includes a hub 31, a first blade 321 and a second blade 322. The outer diameter of the hub 31 gradually decreases from one end close to the first spacer to the other end away from the first spacer. Specifically, in this embodiment, one end of the hub 31 close to the first spacer is a plane, and the hub 31 is generally in the structure of an inwardly concave cone. Of course, in other embodiments, the shape of the hub 31 can also be other shapes, which is not specifically limited. The middle of the hub 31 has an assembly hole o2 for assembling with the output shaft 13 of the motor 1. The first blade 321 and the second blade 322 are arranged at intervals and around the outer peripheral surface of the hub 31, and the length of the first blade 321 along the axial direction of the hub 31 is less than the length of the second blade 322 along the axial direction of the hub 31. Since the outer diameter of the end of the hub 31 away from the first spacer is smaller than the outer diameter of the end close to the first spacer. Therefore, by arranging the large and small blades 32 at intervals, more equidistant air flow channels e can be arranged in the circumferential direction of the hub 31, that is, the density between the blades 32 at the outlet section of the air flow channel e is increased, so that the aspect ratio of the flow channel cross-section at the outlet section of the air flow channel e can be increased. Therefore, the leakage loss of the fluid can be reduced, and further the wind force of the impeller 3 can be improved.

[0048] Furthermore, please refer to Figure 6 , in this embodiment, the projections of the first blade 321 and the second blade 322 on the circumferential surface of the hub 31 are both in a spiral shape. In this way, the wind force of the impeller 3 can be further improved.

[0049] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-speed centrifugal fan, characterized in that, Including: A motor (1) with a front end cover (12) at its front end, and its output shaft (13) rotates and passes through the front end cover (12) axially; A volute casing (2) disposed at one end of the front end cover (12) away from the motor main body (11); An impeller (3) fixedly arranged on the output shaft (13) and located in a volute chamber (c) formed by the front end cover (12) and the volute casing (2); A first isolation member located between the front end cover (12) and the impeller (3) for blocking the output shaft (13) and the impeller (3) from rubbing against the front end cover (12) when the output shaft (13) deviates from the rotation center.

2. The high-speed centrifugal fan according to claim 1, wherein The first isolation member is a copper isolation disc (4), and the distance between the copper isolation disc (4) and the impeller (3) is greater than 0 mm and less than or equal to 7 mm.

3. The high-speed centrifugal fan according to claim 2, characterized in that The copper isolation disc (4) is fixedly arranged on the surface of the front end cover (12), the copper isolation disc (4) is coaxially arranged with the front end cover (12), and the inner diameter of the shaft hole (o3) of the copper isolation disc (4) is smaller than the inner diameter of the shaft hole (o1) of the front end cover (12).

4. The high-speed centrifugal fan according to claim 3, wherein The outer diameter of the copper isolation disc (4) is greater than or equal to the outer diameter of the impeller (3).

5. The high-speed centrifugal fan according to claim 3, characterized in that, One side of the front end cover (12) facing the impeller (3) has an annular groove (a), and the copper isolation disc (4) is fixedly arranged in the annular groove (a) through a fastener.

6. The high-speed centrifugal fan according to claim 1, wherein It further includes a second isolation member disposed in the volute chamber of the volute casing (2) and located between the impeller (3) and the volute casing (2) for blocking the impeller (3) from rubbing against the inner wall of the volute casing when the output shaft (13) deviates from the rotation center.

7. The high-speed centrifugal fan according to claim 6, wherein, The second isolation member is a copper isolation ring (5) fixedly arranged on the inner wall of the volute casing and disposed outside the blades (32) surrounding the impeller (3).

8. The high-speed centrifugal fan according to claim 7, characterized in that, The distance between the copper isolation ring (5) and the outer edge (f) of the blades of the impeller (3) is greater than 0 mm and less than or equal to 7 mm.

9. The high-speed centrifugal fan according to any one of claims 1 to 8, characterized in that, The impeller (3) includes a hub (31), and first blades (321) and second blades (322) arranged around the outer peripheral surface of the hub (31); the outer diameter of the hub (31) gradually decreases from one end close to the first isolation member to the end away from the first isolation member; the first blades (321) and the second blades (322) are arranged at intervals, and the length of the first blades (321) along the axial direction of the hub (31) is less than the length of the second blades (322) along the axial direction of the hub (31).

10. The high-speed centrifugal fan according to claim 9, characterized in that, The projections of the first blades (321) and the second blades (322) on the circumferential surface of the hub (31) are both in a spiral shape.

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