Negative-pressure axial flow fan with sealing ring

Abstract

The utility model provides a negative-pressure axial flow fan with a sealing ring, which comprises a fan shell, and a motor support fixedly provided with a motor is fixedly arranged on the inner wall of the fan shell. A rotating shaft of the motor is fixedly connected with the impeller through the flange plate, and the impeller comprises a plurality of independent fan blades which are evenly fixed to the circumference of the flange plate. The flange plate is provided with a flange positioning column used for installing the flange plate. And the fan shell is provided with a dynamic sealing structure. According to the axial flow fan, the movable sealing ring is arranged on the inner wall of the fan shell, the sealing effect between the impeller and the fan shell is achieved, the air pressure in the shell is improved, and the air supply efficiency is further improved. In addition, the axial flow fan adopts the split-type fan blades, so that the bias weight error among the fan blades is reduced, and the vibration of the impeller during rotation is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of negative pressure fans, in particular to a negative pressure axial flow fan with a sealing ring. Background Art

[0002] Axial flow fans are widely used in production and life. They can quickly provide the required wind power, supply or exhaust air for a specific space, and meet the wind power requirements of production and life. In order to achieve rapid air supply or suction, it is necessary to increase the fan speed or increase the dynamic sealing effect. However, most fans on the market currently do not have a dynamic sealing structure or the dynamic sealing structure is unreasonable, which will lead to pressure relief and reduce the air supply efficiency. When the ideal air supply effect is achieved, a higher speed is required, but the vibration and noise of the fan will increase when supplying or sucking air at high speeds, and the operating noise will also affect the quality of the environment for people's production and life. The vibration caused by the operation of the fan is harmful to the equipment. Long-term exposure to a vibrating environment will cause parts to loosen and even cause accelerated wear of components.

[0003] In addition, during the assembly process of the fan, the dynamic balance problem of the fan blades will also cause the impeller to vibrate greatly when rotating. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a negative pressure axial flow fan with a sealing ring to solve the problems of poor mechanical sealing effect, low wind pressure, low air supply efficiency and large vibration of the prior art fan.

[0005] The utility model provides a negative pressure axial flow fan with a sealing ring, the axial flow fan comprising: a fan housing, the inner wall of the fan housing is fixedly provided with a motor bracket for fixing a motor; the rotating shaft of the motor is fixedly connected to an impeller through a flange, the impeller comprises a plurality of independent blades, and the plurality of blades are evenly fixed on the circumference of the flange; the flange is provided with a flange positioning column for installing the flange; the fan housing is provided with a dynamic sealing structure.

[0006] Furthermore, the dynamic sealing structure comprises a sealing ring, and the sealing ring is fixedly arranged on the inner wall of the fan housing, corresponding to the blade tip position of the impeller.

[0007] Furthermore, the inner wall of the fan housing has an annular mounting groove, and the sealing ring is arranged in the mounting groove.

[0008] Furthermore, a plurality of sealing ring fixing seats are evenly arranged on the outer wall of the fan housing at positions corresponding to the mounting grooves, and are fixedly connected to the sealing ring via fixing members.

[0009] Furthermore, there is a clearance fit between the sealing ring and the impeller.

[0010] In an implementation manner of the utility model, a hub is provided at the blade root of the fan blade, and the hubs of a plurality of the fan blades are butt-jointed and fixed on the flange.

[0011] Furthermore, the wheel hub is provided with an inlay groove, and the flange has an inlay block corresponding to the inlay groove.

[0012] Furthermore, a plurality of counterweight grooves are evenly arranged along the circumference between the root of the fan blade and the inlay groove.

[0013] Furthermore, the wheel hub is provided with fixing holes, and the fixing holes are correspondingly connected to the fixing holes on the flange.

[0014] In an implementation manner of the utility model, the axial flow fan further comprises a fixing frame, and the fixing frame is arranged outside the fan housing.

[0015] According to the above embodiments, the negative pressure axial flow fan with a sealing ring provided by the utility model has at least the following benefits: the axial flow fan achieves a sealing effect between the impeller and the fan casing by arranging a dynamic sealing ring on the inner wall of the fan casing, thereby increasing the air pressure inside the casing and further improving the air supply efficiency.

[0016] In addition, the axial flow fan adopts split blades, which can reduce the weight error between the blades by using the same set of molds during the production of the blades. After the impeller is assembled, the vibration caused by the deviation of the center of gravity when it rotates is smaller.

[0017] It should be understood that the above general description and the following specific embodiments are only exemplary and illustrative and are not intended to limit the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are a part of the specification of the present utility model, which illustrate exemplary embodiments of the present utility model. The attached drawings and the description of the specification are used to explain the principle of the present utility model.

[0019] Figure 1 This is a structural diagram of embodiment 1 of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0020] Figure 2 This is a cross-sectional view of Embodiment 1 of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0022] Figure 4 This is a structural diagram of an impeller of Embodiment 1 of a negative pressure axial flow fan with a sealing ring provided by the utility model.

[0023] Figure 5 This is a structural diagram of a sealing ring fixing seat of a negative pressure axial flow fan with a sealing ring provided by the utility model.

[0024] Figure 6 This is a fan blade structure diagram of Example 1 of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0025] Figure 7 This is a structural diagram of the second embodiment of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0026] Figure 8 This is a side view of the second embodiment of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0027] Fig. 9 This is a structural diagram of the third embodiment of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0028] Fig.10 This is a cross-sectional view of the third embodiment of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0029] Fig.11 This is a structural diagram of a fourth embodiment of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0030] Fig.12 This is a structural diagram of an impeller of a fourth embodiment of a negative pressure axial flow fan with a sealing ring provided by the utility model.

[0031] Fig.13 This is a fan blade structure diagram of the fourth embodiment of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0032] Fig.14 This is a structural diagram of Embodiment 5 of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0033] Fig.15 This is a structural diagram of Example 6 of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0034] Fig.16 This is a structural diagram of an impeller of a sixth embodiment of a negative pressure axial flow fan with a sealing ring provided by the utility model.

[0035] Fig.17 This is a side view of the impeller of Example 6 of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0036] Fig.18 This is a fan blade structure diagram of Example 6 of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0037] Fig.19 This is a structural diagram of Embodiment 7 of the negative pressure axial flow fan with a sealing ring provided by the utility model.

[0038] Description of reference numerals:

[0039] 1-fan housing, 2-motor bracket, 3-motor, 4-flange, 5-impeller, 6-dynamic sealing structure, 7-fixed frame;

[0040] 51-fan blade, 52-wheel hub, 53-inlay groove, 54-counterweight groove, 55-fixing hole;

[0041] 61-sealing ring, 62-sealing ring fixing seat, 63-screw, 64-circlip. DETAILED DESCRIPTION

[0042] Various exemplary embodiments of the present invention are now described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features and embodiments of the present invention.

[0043] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention will be apparent to those skilled in the art. The present application description and examples are merely exemplary.

[0044] The utility model provides a negative pressure axial flow fan with a sealing ring, such as Figure 1 and 2 The structure diagram of the axial flow fan is shown. In a specific implementation, the axial flow fan comprises: a fan housing 1, and a motor bracket 2 for fixing a motor 3 is fixedly arranged on the inner wall of the fan housing 1. In this embodiment, the motor bracket 2 is a T-shaped structure, which can reduce the wind resistance of the air inlet and improve the air intake efficiency.

[0045] The rotating shaft of the motor 3 is fixedly connected to the impeller 5 through the flange 4, driving the impeller 5 to rotate and deliver air. Figure 4 and Figure 5 As shown, the impeller 5 includes a plurality of independent blades 51, and the plurality of blades 51 are evenly fixed on the circumference of the flange 4. In this embodiment, the number of the blades 51 of the impeller 5 is 7.

[0046] The flange 4 is provided with a flange positioning column for installing the flange 4;

[0047] The fan housing 1 is provided with a dynamic sealing structure 6 , which cooperates with the impeller 5 to reduce the gap between the impeller 5 and the fan housing 1 , thereby reducing the pressure relief and achieving pressurization inside the fan housing 1 .

[0048] In the specific implementation of the utility model, Figure 3 As shown, the dynamic sealing structure 6 includes a sealing ring 61 , which is fixedly arranged on the inner wall of the fan housing 1 , corresponding to the blade tip position of the impeller 5 .

[0049] Furthermore, the inner wall of the fan housing 1 has an annular mounting groove, and the sealing ring 61 is arranged in the mounting groove. There is a clearance fit between the sealing ring 61 and the impeller 5. The clearance fit can reduce the pressure relief as much as possible, increase the pressure inside the housing, and improve the air supply efficiency. In this embodiment, preferably, the sealing ring 61 is made of graphite, which is a flexible material. While achieving a better dynamic sealing effect, it can reduce the wear when the blades rotate and the sealing ring accidentally rub against each other.

[0050] Furthermore, a plurality of sealing ring fixing seats 62 are evenly arranged at positions corresponding to the mounting grooves on the outer wall of the fan housing 1 and are fixedly connected to the sealing ring 61 through fixing members. Figure 6 As shown, the sealing ring fixing seat 62 is fixedly installed by means of a screw 63 , and a retaining spring 64 is provided at the end of the screw to prevent the screw 63 from loosening due to vibration or the like during use.

[0051] In the specific implementation of the utility model, Figure 4 and 5 As shown, a hub 52 is provided at the root of the blade 51, and the hubs 52 of multiple blades 51 are connected and fixed on the flange 4, and the multiple hubs 52 form a circle along the center of the circle.

[0052] Furthermore, the hub 52 is provided with an inlay groove 53, and the flange 4 is provided with an inlay block corresponding to the inlay groove 53. Preferably, in order to improve the connection firmness of the inlay structure, the inlay groove 53 is an arc-shaped structure and is coaxial and concentric with the flange 4.

[0053] Furthermore, a plurality of counterweight grooves 54 are evenly arranged along the circumference between the root of the blade 51 and the inlay groove 53. Counterweights can be arranged in the counterweight grooves, so that the dynamic balance of the impeller 5 during rotation can be adjusted, so that the rotation of the impeller 5 is more stable, the magnitude of vibration is reduced, and the noise caused by vibration is reduced. In addition, the counterweight grooves 54 also have the function of reducing weight, which can reduce the weight of the blade while ensuring the structural strength, thereby reducing the power consumption and centrifugal force of the blade rotation.

[0054] Furthermore, the hub 52 is provided with fixing holes 55 , and the fixing holes 55 are correspondingly connected to the fixing holes on the flange 4 .

[0055] like Figure 7 and Figure 8 The structure diagram of the second embodiment of the negative pressure axial flow fan with a sealing ring is shown. Figure 1 and2 The difference of the illustrated embodiment is that, in this embodiment, the axial flow fan further has a fixing frame 7, which is arranged outside the fan housing 1 and is used to provide a connection platform with an external fixed connection structure.

[0056] like Fig. 9 and Fig.10 The structure diagram of the third embodiment of the negative pressure axial flow fan with a sealing ring is shown. Figure 1 and 2 The difference of the illustrated embodiment is that, in this embodiment, the number of the blades 51 of the impeller 5 is five.

[0057] like Figure 11-13 The structure diagram of the fourth embodiment of the negative pressure axial flow fan with a sealing ring is shown. Figure 1 and 2 The difference of the illustrated embodiment is that, in this embodiment, the blade tip of the fan blade 51 is a symmetrical structure, and the front and rear of the blade tip are transitionally rounded.

[0058] like Fig.14 The structure diagram of the negative pressure axial flow fan with sealing ring is shown in the fifth embodiment. Fig.11 The difference of the illustrated embodiment is that, in this embodiment, the axial flow fan further has a fixing frame 7, which is arranged outside the fan housing 1 and is used to provide a connection platform with an external fixed connection structure.

[0059] like Figure 15-18 The structure diagram of the sixth embodiment of the negative pressure axial flow fan with a sealing ring is shown. Figure 1 and 2 The difference of the illustrated embodiment is that in this embodiment, the fan blade 51 is a curved structure, and in the top view, the fan blade 51 is a symmetrical structure, the fan blade 51 is a straight line from the blade root to the blade tip, and the blade tip width is smaller than the blade root width.

[0060] In addition, in this embodiment, the wheel hub 52 is a circular structure and is perpendicular to the plane of the flange 4. The side wall of the circular structure of the wheel hub 52 has an annular embedding groove 53 for clamping and connecting with the flange 4. However, the wheel hub 52 in this embodiment does not have a counterweight groove 54 and a fixing hole 55.

[0061] like Fig.19 The structure diagram of the seventh embodiment of the negative pressure axial flow fan with a sealing ring is shown. Fig.15 The difference of the illustrated embodiment is that, in this embodiment, the axial flow fan further has a fixing frame 7, which is arranged outside the fan housing 1 and is used to provide a connection platform with an external fixed connection structure.

[0062] The above description is only an illustrative specific implementation of the present invention. Without departing from the concept and principle of the present invention, any equivalent changes and modifications made by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A negative pressure axial flow fan with a sealing ring, characterized in that: The axial flow fan comprises: a fan housing (1), wherein a motor bracket (2) for fixing a motor (3) is fixedly arranged on the inner wall of the fan housing (1); The rotating shaft of the motor (3) is fixedly connected to the impeller (5) via a flange (4); the impeller (5) comprises a plurality of independent blades (51); and the plurality of blades (51) are evenly fixed on the circumference of the flange (4); The flange (4) is provided with a flange positioning column for installing the flange (4); The fan housing (1) is provided with a dynamic sealing structure (6).

2. The negative pressure axial flow fan with a sealing ring according to claim 1, characterized in that: The dynamic sealing structure (6) comprises a sealing ring (61), and the sealing ring (61) is fixedly arranged on the inner wall of the fan housing (1) and corresponds to the blade tip position of the impeller (5).

3. The negative pressure axial flow fan with a sealing ring according to claim 2, characterized in that: The inner wall of the fan housing (1) has an annular mounting groove, and the sealing ring (61) is arranged in the mounting groove.

4. The negative pressure axial flow fan with a sealing ring according to claim 3, characterized in that: A plurality of sealing ring fixing seats (62) are evenly arranged on the outer wall of the fan housing (1) at positions corresponding to the mounting grooves and are fixedly connected to the sealing ring (61) via fixing members.

5. The negative pressure axial flow fan with a sealing ring according to any one of claims 2 to 4, characterized in that: There is a clearance fit between the sealing ring (61) and the impeller (5).

6. The negative pressure axial flow fan with a sealing ring according to claim 1, characterized in that: A hub (52) is provided at the blade root of the fan blade (51), and the hubs (52) of a plurality of the fan blades (51) are butt-jointed and fixed on the flange (4).

7. The negative pressure axial flow fan with a sealing ring according to claim 6, characterized in that: The wheel hub (52) is provided with an inlay groove (53), and the flange (4) has an inlay block corresponding to the inlay groove (53).

8. The negative pressure axial flow fan with a sealing ring according to claim 7, characterized in that: A plurality of counterweight grooves (54) are evenly arranged along the circumference between the blade root of the fan blade (51) and the embedding groove (53).

9. The negative pressure axial flow fan with a sealing ring according to claim 6, characterized in that: The wheel hub (52) is provided with a fixing hole (55), and the fixing hole (55) is correspondingly connected to the fixing hole on the flange (4).

10. The negative pressure axial flow fan with a sealing ring according to claim 1, characterized in that: The axial flow fan also has a fixing frame (7), and the fixing frame (7) is arranged outside the fan housing (1).

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