CN220890582U - Drying fan and washing drier - Google Patents

Abstract

The utility model provides a drying fan and a washing and drying machine, wherein the drying fan comprises: the fan volute comprises an upper volute and a lower volute which are mutually buckled; the driving motor is assembled on the outer end face of the upper volute, and a rotating shaft of the driving motor extends out of the inner end face of the upper volute from the outer end face of the upper volute; the sealing piece is provided with a connecting ring and a sealing cover ring, the sealing piece is fixedly sleeved on the shaft section of the rotating shaft extending out of the inner side end face through the connecting ring, and the free end of the sealing cover ring is in abutting connection with the inner side end face to form a sealing cover for the passing annular gap between the rotating shaft and the upper volute. The utility model can realize the sealing of the passing annular gap between the rotating shaft and the upper volute, effectively prevent water vapor, filth, dust and the like in the fan volute from entering the driving motor through the passing annular gap, and prevent the driving motor from being damaged.

Description

Drying fan and washing drier

Technical Field

The utility model belongs to the technical field of design of clothes washing and drying machines, and particularly relates to a drying fan and a clothes washing and drying machine.

Background

The washing and drying machine is also called a washing and drying machine and mainly comprises an air duct component, a roller component and a condensing system. When the washing and drying machine is in a washing state and performs a high-temperature washing mode, the roller component is communicated with the air channel component, water vapor in the roller diffuses into the air channel component, and a high-temperature and high-humidity environment is formed in the air channel component; when the drum is in a drying state, electric heating is performed, hot air is sent into the drum part through high-speed rotation (7500 r/min) of a centrifugal fan (namely a drying fan), water contained in clothes in the drum is evaporated and taken away by utilizing the characteristic that saturated vapor pressure of water in the hot air is high, hot water vapor is condensed and separated out through a condensation structure in the rear drum, and a large amount of water vapor and filth circulate in the drum and an air duct through high-speed rotation of the centrifugal fan in the working process.

The oil seal is a widely applied rotary shaft sealing mode, is commonly used in rotary transmission devices with small sizes, can be used for sealing lubricating oil, and is also used for sealing gas and preventing dust. The oil seal has compact structure and reliable performance, and in a free state, the inner diameter is smaller than the shaft diameter, namely, the inner diameter has certain interference, and after the oil seal is arranged on a shaft, the pressure of the lip and the contraction force of the self-tightening spring generate certain holding force on the sealing shaft to intercept leakage gaps, so that the sealing purpose is achieved. However, when the oil seal is directly contacted with the surface of the transmission shaft, a friction pair is formed, the material of the general shaft is softer, the rotating speed is higher, and after a period of working, the transmission shaft is abraded with groove marks at the contact position of the oil seal, so that the sealing effect is deteriorated. After the oil seal and the contact position of the shaft are replaced for a plurality of times, the shaft is scrapped, but the transmission shaft at the moment is seriously worn except for the contact position of the oil seal, other precision can meet the technical requirement, so that the waste is very large, meanwhile, water vapor, filings, dust and the like in the air duct enter the motor through the matching position between the worn rotating shaft and the oil seal structure to form the hidden trouble of motor damage, and therefore, the sealing structure is improved to avoid the rapid wear of the transmission shaft.

Disclosure of utility model

Therefore, the utility model provides a drying fan and a dryer, which can solve the technical problems that in the prior art, an oil seal structure adopted by the sealing between the rotating shaft of a driving motor of the drying fan of the dryer and the inside of an air duct forms a friction pair when the rotating shaft rotates, so that the rotating shaft is worn and scrapped, the after-sale maintenance cost of the dryer is increased, and meanwhile, water vapor, filigree, dust and the like in the air duct enter the inside of the motor through the matching position between the worn rotating shaft and the oil seal structure, thereby forming the hidden danger of motor damage.

In order to solve the above problems, the present utility model provides a drying fan, comprising:

The fan volute comprises an upper volute and a lower volute which are mutually buckled;

The driving motor is assembled on the outer side end face of the upper volute, and a rotating shaft of the driving motor extends from the outer side end face of the upper volute to the inner side end face of the upper volute;

The sealing piece is provided with a connecting ring and a sealing cover ring, the sealing piece is fixedly sleeved on the shaft section of the rotating shaft extending out of the inner side end face through the connecting ring, and the free end of the sealing cover ring is in abutting connection with the inner side end face to form a sealing cover for the passing annular gap of the rotating shaft and the upper volute.

In some embodiments of the present invention, in some embodiments,

The sealing cover ring is of a horn mouth structure, and a large mouth of the horn mouth structure faces one side of the driving motor.

In some embodiments of the present invention, in some embodiments,

The sealing piece is made of wear-resistant rubber, and in a use state, the free end of the sealing cover ring is in interference fit with the inner side end face in an interference fit mode to be in interference fit connection, and/or the connecting ring is fixedly sleeved with the rotating shaft in an interference fit mode.

In some embodiments of the present invention, in some embodiments,

The interference between the free end of the sealing cover ring and the inner side end surface is 0.1mm; and/or the unilateral interference between the connecting ring and the rotating shaft is 0.2mm.

In some embodiments of the present invention, in some embodiments,

The free end of the rotating shaft is also sleeved with a limiting gasket, a fan blade and a locking nut, the limiting gasket, the fan blade and the locking nut are sequentially arranged adjacently along the direction away from the connecting ring, and the limiting gasket is in abutting connection with the end face of the connecting ring away from the driving motor.

In some embodiments of the present invention, in some embodiments,

Lubricating grease is contained in the covering space of the sealing cover ring.

In some embodiments of the present invention, in some embodiments,

The inner side end face is provided with a convex ring coaxial with the rotating shaft, and the free end of the sealing cover ring is in abutting connection with the surrounding area of the convex ring.

In some embodiments of the present invention, in some embodiments,

When the limiting gasket is included, the diameter of the limiting gasket is not smaller than the inner diameter of the convex ring.

In some embodiments of the present invention, in some embodiments,

The upper volute is provided with a shaft hole, the rotating shaft penetrates through the shaft hole, and the aperture of the shaft hole is smaller and smaller along the direction close to the sealing element.

The utility model also provides a dryer, which comprises the drying fan.

The drying fan and the washing and drying machine provided by the utility model have the following beneficial effects:

The sealing element in the fan volute is fixedly connected with the rotating shaft through the connecting ring, and is in abutting connection with the inner side end face of the upper volute through the sealing cover ring, so that the sealing of a passing annular gap between the rotating shaft and the upper volute can be realized, water vapor, burrs, dust and the like in the fan volute are effectively prevented from entering the driving motor through the passing annular gap, the protection level of the driving motor is improved, the driving motor is prevented from being damaged, and meanwhile, the sealing element is fixedly connected with the rotating shaft through the connecting ring and can rotate along with the rotation of the rotating shaft, so that abrasion is not formed on the rotating shaft, the service life of the rotating shaft is effectively prolonged, and the after-sale maintenance cost of the drying fan is further reduced;

The sealing cover ring is of a bell mouth structure, a large mouth of the bell mouth structure faces one side of the driving motor, when the sealing cover ring is in contact with the inner side end face of the upper volute, the sealing cover ring can have a tendency of outwards turning out, and the outward turning tendency can enable the contact matching surfaces between the sealing cover ring and the inner side end face to be in surface contact, so that the sealing effect between the sealing cover ring and the inner side end face is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the utility model, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present utility model, should fall within the ambit of the technical disclosure.

Fig. 1 is a schematic perspective view of a drying fan according to an embodiment of the present utility model;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a cross-sectional view of B-B in FIG. 2;

FIG. 4 is a cross-sectional view of A-A of FIG. 2;

FIG. 5 is a partial enlarged view at B in FIG. 4;

FIG. 6 is a schematic axial cross-sectional view of the seal of FIG. 5;

fig. 7 is a partial cross-sectional view of the upper volute of fig. 1.

The reference numerals are expressed as:

11. An upper volute;

111. A convex ring; 112. a shaft hole;

12. a lower volute;

2. A driving motor;

21. a rotating shaft;

3. a seal;

31. a connecting ring; 32. a seal shroud;

41. a limiting gasket; 42. a fan blade; 43. a lock nut;

51. A housing seal ring; 52. an air port sealing ring; 53. and a motor mounting groove.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

Referring to fig. 1 and fig. 7 in combination, according to an embodiment of the present utility model, referring to fig. 4 and fig. 5 in combination in particular, a drying fan is provided, including:

The fan volute (not indexed in the figure) comprises an upper volute 11 and a lower volute 12 which are buckled with each other, and a shell sealing ring 51 can be clamped between the upper volute 11 and the lower volute 12 so as to form a volute air channel with better sealing performance after the upper volute 11 and the lower volute 12 are buckled with each other, and buckling connection of the upper volute 11 and the lower volute 12 can be realized through corresponding bolt bolting;

The driving motor 2 is assembled on the outer end surface of the upper volute 11, and a rotating shaft 21 of the driving motor 2 extends from the outer end surface of the upper volute 11 to the inner end surface of the upper volute 11 so as to be reliably connected with the fan blades 42 in the fan volute and further drive the fan blades 42 to rotate;

The seal 3, see fig. 6, has a connecting ring 31 and a seal cover ring 32, the seal cover ring 32 is connected to one side of the connecting ring 31, the seal 3 is fixedly sleeved on a shaft section of the rotating shaft 21 extending out of the inner side end surface through the connecting ring 31, that is, the aforementioned connecting ring 31 is fixedly connected with the rotating shaft 21, the free end of the seal cover ring 32 is in abutting connection with the inner side end surface to form a seal cover for the passing annular gap between the rotating shaft 21 and the upper volute 11, that is, the free end of the seal cover ring 32 is in abutting connection with the inner side end surface instead of being fixedly connected, so that the seal 3 can rotate along with the rotation of the rotating shaft 21, and the seal 3 can also form a sealing effect for the aforementioned passing annular gap along with the rotation of the rotating shaft 21.

In this technical scheme, be in the inside sealing member 3 of fan spiral case on the one hand through fixed connection between go-between 31 and the pivot 21, on the other hand then through the tight shroud 32 with go up spiral case 11's inboard terminal surface conflict be connected, thereby can realize the sealed to the annular clearance that walks of pivot 21 and last spiral case 11, effectively prevent inside steam of fan spiral case, the filth, dust etc. get into driving motor 2 department through aforementioned annular clearance that walks, driving motor 2's protection level has been improved, prevent damage driving motor 2, simultaneously, because sealing member 3 passes through go-between 31 and pivot 21 fixed connection, it can follow the rotation of pivot 21 and rotate, thereby can not constitute wearing and tearing to pivot 21, effectively improve the life of pivot 21, and then reduce drying fan's after-market maintenance cost.

In some embodiments of the present invention, in some embodiments,

The sealing cover ring 32 has a bell mouth structure, and the large mouth of the bell mouth structure faces to one side of the driving motor 2. The horn mouth structure is a truncated cone-shaped cylinder structure with one end port diameter smaller than the other end port diameter.

In this technical scheme, seal shroud 32 is horn mouth structure and this horn mouth structure's big mouth towards driving motor 2 one side, can make seal shroud 32 conflict when connecting on the inboard terminal surface of last spiral case 11, can have the trend of outwards turning out, and this trend of turning out can make between the contact mating surface between seal shroud 32 and the inboard terminal surface be the face contact to guarantee the sealed effect between the two.

In some embodiments of the present invention, in some embodiments,

The sealing member 3 is made of wear-resistant rubber, and in a use state, the free end of the sealing cover ring 32 is in interference fit with the inner end surface, wherein the interference fit means that an axial force facing the inner end surface is applied to the axial direction of the sealing cover ring 32, and the axial force causes the wear-resistant rubber to be deformed outwards.

In this technical scheme, adopt the wear-resisting rubber that has elastic deformation ability, can do benefit to its elastic deformation ability and realize the valgus in the conflict in-process of sealing member 3 and inboard terminal surface, and then utilize this valgus state to increase the conflict area of sealing cover ring 32 and inboard terminal surface of sealing member 3, promote the sealed effect of sealing member 3.

The aforementioned connection ring 31 may be specifically implemented by various manners capable of implementing the fixed connection between the connection ring 31 and the rotating shaft 21, for example, the aforementioned connection ring 31 and the rotating shaft 21 may be implemented by an adhesive manner, or of course, the fixed connection may also be implemented by a positioning pin, a concave-convex matching structure, a fixing screw, or the like, and as a more preferred embodiment, the connection ring 31 and the rotating shaft 21 are fixedly sleeved in an interference fit manner, and it can be understood that, since the sealing member 3 is made of a wear-resistant rubber material and has a certain elastic deformation capability, the fixed connection processing process of the sealing member 3 and the rotating shaft 21 can be greatly simplified by adopting an interference fit manner.

In a specific embodiment, the interference between the free end of the seal cover ring 32 and the inner end surface is 0.1mm, and the interference can reduce the abrasion degree of the seal cover ring 32 in the process of abutting rotation as much as possible on the basis of ensuring the tightness between the seal cover ring 32 and the inner end surface; and/or, the single-side interference between the connecting ring 31 and the rotating shaft 21 is 0.2mm, so as to ensure the reliability of the fixed connection between the connecting ring 31 and the rotating shaft 21.

With continued reference to fig. 5, in some embodiments,

The free end (also called shaft extension end) of the rotating shaft 21 is also sleeved with a limiting gasket 41, a fan blade 42 and a locking nut 43, the limiting gasket 41, the fan blade 42 and the locking nut 43 are sequentially arranged adjacently along the direction away from the connecting ring 31, the limiting gasket 41 is in abutting connection with the end face of the connecting ring 31 away from the driving motor 2, the rotating shaft 21 is provided with a corresponding limiting shaft shoulder, the limiting shaft shoulder can form positioning limiting on the position of the limiting gasket 41 in the axial direction of the rotating shaft 21, and therefore the limiting gasket 41 and the locking nut 43 form reliable clamping on the fan blade 42, and the positioned fan blade 42 rotates along with the rotating shaft 21.

In this technical scheme, the spacing pad 41 and the locking nut 43 together form reliable axial and circumferential positioning for the fan blade 42, and on the other hand, the axial positioning can be formed for the side surface of the sealing element 3 far away from the inner side end surface, and an axial force can be applied to the sealing element 3 during the axial positioning, so as to ensure the interference fit between the sealing cover ring 32 and the inner side end surface. Specifically, the axial distance between the limiting shoulder and the inner end surface should be smaller than the axial height of the seal member 3 in the free state, so that when the seal member 3 is assembled on the rotating shaft 21, after the locking nut 43, the fan blade 42 and the limiting gasket 41 are assembled in sequence, an interference force is naturally generated to apply force to the axial direction of the seal member 3 and ensure the interference fit.

The fan blade 42 is specifically a centrifugal fan blade, at this time, the drying fan is a centrifugal fan, the corresponding fan volute is a centrifugal volute, and the centrifugal fan volute is provided with an air inlet (not labeled in the figure) located in the axial direction of the centrifugal fan and an air outlet (not labeled in the figure) located in the tangential direction (or circumferential direction of the centrifugal fan), a circle of air outlet sealing ring 52 can be specifically arranged at the air outlet, and the air outlet is specifically in butt joint with one port of the drying air duct shell of the dryer so as to ensure the sealing effect at the butt joint mating surface of the drying air duct shell and the air outlet.

In a more preferred embodiment of the present invention,

The space covered by the seal cover ring 32 is filled with lubricating grease (not shown in the figure), and the space covered by the seal cover ring 32 is the inner space of the seal cover ring 32, and the lubricating grease is filled in the space covered by the seal cover ring 32, so that the lubricating grease is in a semi-solid semi-fluid state with certain viscosity and does not flow out more under the sealing action of the seal cover ring 32, and the lubricating grease is reliably positioned in the space covered by the seal cover ring 32 when the sealing effect of the seal cover ring 32 is at a better level.

In this technical scheme, the lubricating grease is filled in the housing space of the seal housing ring 32, so that the sealing effect of the seal housing ring 32 on the passing annular space between the rotating shaft 21 and the upper volute 11 can be further improved. Specifically, when moisture, burrs, dust and the like in the fan volute are worn between the free end and the inner end face of the seal shroud 32 to form a large gap, the moisture, the burrs, the dust and the like need to pass through the blocking area of the lubricating grease again to reach the passing annular gap, and therefore the sealing effect is further improved.

In some embodiments of the present invention, in some embodiments,

Referring specifically to fig. 7, the partial structure of the upper volute 11 is shown in fig. 7, it can be seen that a convex ring 111 coaxial with the rotating shaft 21 is configured on the inner end surface, the free end of the seal cover ring 32 is in abutting connection with the surrounding area of the convex ring 111, at this time, it can be understood that the rotating shaft 21 and the convex ring 111 are concentrically arranged, and at the same time, the abutting matching surface of the seal cover ring 32 and the inner end surface is located in the surrounding area of the convex ring 111, so that when the seal cover ring 32 and the inner end surface relatively rotate for a long time to generate great wear, there may be a matching gap between the two, at this time, the lubricating grease contained in the seal cover ring 32 will be discharged under the effect of centrifugal force, at this time, due to the arrangement of the convex ring 111, the lubricating grease discharged from the seal cover ring can be contained in the surrounding area, and the laundry is prevented from being thrown into the laundry containing space of the dryer after entering the fan volute, and polluting laundry.

In a specific embodiment, the convex height of the convex ring 111 is 1.5mm, the inner diameter is 19mm, and the outer diameter is 22.5mm.

In some embodiments, when a spacing washer 41 is included, the diameter of the spacing washer 41 is not less than the inner diameter of the collar 111, i.e., the outer diameter of the spacing washer 41 is at least equal to the inner diameter of the collar 111.

In this technical scheme, the diameter of spacing gasket 41 is not less than the internal diameter of bulge loop 111 by the design, so can make spacing gasket 41 form the shielding to a certain extent to the ring mouth of bulge loop 111, when the lubricating grease in the cover space of sealed cover ring 32 is thrown to bulge loop 111 department, can further hinder this part to be thrown out in the lubricating grease gets into the clothing space. It will be appreciated that a certain gap should be maintained between the limiting pad 41 and the collar 111 to prevent direct contact therebetween.

With further reference to fig. 7, in some embodiments,

The upper volute 11 is provided with a shaft hole 112, the rotating shaft 21 passes through the shaft hole 112, the aperture of the shaft hole 112 is smaller and smaller along the direction approaching the sealing element 3, and in a specific embodiment, the aperture of the large end of the shaft hole 112 is 10.1mm, and the aperture of the small end of the shaft hole 112 is 9.6mm.

In this technical scheme, shaft hole 112 is the toper round hole that one-to-one end is big one end is little, so sets up can do benefit to the equipment of passing through in the pivot 21 to this shaft hole 112, simultaneously, the pivot 21 that can also make is less with the annular clearance that passes through of shaft hole 112 medial surface one side for lubricating grease can reliably realize the seal to this annular clearance that passes through.

The outer end surface of the upper scroll 11 has a corresponding motor mounting groove 53, and the assembly surface of the fixed part of the drive motor 2 is fitted into the motor mounting groove 53 when the drive motor 2 is assembled.

The following describes the steps of assembling the drying fan of the present utility model:

The motor (namely the driving motor 2, the lower part is the same as the driving motor) is placed in the volute (upper cover) (namely the upper volute 11, the lower part is the same as the driving motor), the motor is limited by the clamping groove (namely the motor mounting groove 53, the lower part is the same as the driving motor), and then the motor is fixed by 3 ST3.9 x 16 self-tapping screws; a layer of lubricating grease (namely the lubricating grease, the same applies below) is uniformly smeared in the clamping groove; then, a sealing ring (fan) (namely the sealing piece 3, the same applies below) is put in, the plane of the sealing ring (fan) (namely the connecting ring 31, the same applies below) is upward, a layer of lubricating grease is smeared, and then, a stainless steel gasket (fan) (namely the limit gasket 41, the same applies below) is put in; the centrifugal fan blade assembly (namely the fan blade 42, the same applies below) is arranged on a motor shaft (namely the rotating shaft 21, the same applies below), and finally is fixed by a nut (namely the locking nut 43);

The sealing strip (spiral case 1) (namely, the shell sealing ring 51, the same applies below) is arranged on the sealing groove of the spiral case (lower cover) (namely, the lower spiral case 12, the same applies below); installing a volute (upper cover), and locking and fixing through 6 ST4.2 x 13 self-tapping screws; and then the sealing strip (the volute 2) (namely the air port sealing ring 52 and the lower part are the same) is arranged in a sealing groove matched with the upper cover and the lower cover of the volute.

Based on the assembly, a complete drying fan assembly is formed, when the centrifugal fan blade is driven by the direct current motor to rotate at a high speed, a gap between a motor shaft and a volute (upper cover) is reserved, and water vapor, filings and dust in circulating air flow in the high-speed rotating air duct assembly (namely in a fan shell) can be effectively avoided from entering the motor due to combined isolation of a sealing ring (fan) +lubricating grease, so that filings are prevented from winding a motor rotor and blocking, and the motor is burnt out; and the abnormal sound or the damage of the bearing caused by dust entering the motor bearing is avoided.

On the other hand, because of the existence of the lubricating grease, the axial direction between the sealing ring (fan) and the volute (upper cover) can be designed into a zero clearance or a clearance fit structure considering grease sealing; if no lubricating grease exists, the axial direction between the sealing ring (fan) and the volute (upper cover) is required to be in interference fit, long-term high-speed operation is required, and a motor shaft drives the sealing ring (fan) to rub with the volute upper cover (upper cover) at a high speed, so that the sealing ring is worn out, water vapor, filings and dust enter the motor, and the filings wind a motor rotor, so that the motor burns out.

According to the embodiment of the utility model, a dryer is further provided, which comprises the drying fan. Due to the adoption of the drying fan, the sealing piece 3 in the fan volute is fixedly connected with the rotating shaft 21 through the connecting ring 31, and is in abutting connection with the inner side end face of the upper volute 11 through the sealing cover ring 32, so that the sealing of a passing annular gap between the rotating shaft 21 and the upper volute 11 can be realized, water vapor, filings, dust and the like in the fan volute are effectively prevented from entering the driving motor 2 through the passing annular gap, the protection level of the driving motor 2 is improved, the driving motor 2 is prevented from being damaged, and meanwhile, the sealing piece 3 can rotate along with the rotation of the rotating shaft 21 through the connecting ring 31, so that the rotating shaft 21 is not worn, the service life of the rotating shaft 21 is effectively prolonged, and the after-sale maintenance cost of the drying fan is further reduced.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model. The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims (6)

1. A drying fan, characterized by comprising:

The fan volute comprises an upper volute (11) and a lower volute (12) which are buckled with each other;

The driving motor (2), the said driving motor (2) assembles on the outer end surface of the said upper volute (11), the said driving motor (2) has spindle (21) stretches out to the inner end surface of the said upper volute (11) from the outer end surface of the said upper volute (11);

The sealing piece (3) is provided with a connecting ring (31) and a sealing cover ring (32), the sealing piece (3) is fixedly sleeved on a shaft section of the rotating shaft (21) extending out of the inner side end surface through the connecting ring (31), and the free end of the sealing cover ring (32) is in abutting connection with the inner side end surface to form a sealing cover for a passing annular gap of the rotating shaft (21) and the upper volute (11); the sealing piece (3) is made of wear-resistant rubber, the free end of the sealing cover ring (32) is in interference fit with the inner side end surface in a use state, and the connecting ring (31) is fixedly sleeved with the rotating shaft (21) in an interference fit manner; lubricating grease is contained in the cover space of the seal cover ring (32), a convex ring (111) coaxial with the rotating shaft (21) is constructed on the inner side end face, the free end of the seal cover ring (32) is in conflict connection with the surrounding area of the convex ring (111), a shaft hole (112) is constructed on the upper volute (11), the rotating shaft (21) passes through the shaft hole (112), the aperture of the shaft hole (112) is smaller and smaller along the direction close to the sealing element (3), the passing annular gap of the rotating shaft (21) and the shaft hole (112) on one side of the inner side end face is smaller, and the lubricating grease can reliably realize sealing of the passing annular gap.

2. The drying blower of claim 1, wherein,

The sealing cover ring (32) is of a horn mouth structure, and a large mouth of the horn mouth structure faces one side of the driving motor (2).

3. The drying blower of claim 1, wherein,

The interference between the free end of the seal shroud (32) and the inner end face is 0.1mm; and/or, the unilateral interference between the connecting ring (31) and the rotating shaft (21) is 0.2mm.

4. The drying blower of claim 1, wherein,

Still the cover is equipped with spacing gasket (41), fan blade (42) and lock nut (43) on the free end of pivot (21), spacing gasket (41), fan blade (42) and lock nut (43) are along keeping away from the direction of go-between (31) is adjacent in proper order to be set up, just spacing gasket (41) with go-between (31) are kept away from the terminal surface conflict of driving motor (2) is connected.

5. The drying blower of claim 1, wherein,

When the limiting gasket (41) is included, the diameter of the limiting gasket (41) is not smaller than the inner diameter of the convex ring (111).

6. A dryer comprising a drying blower according to any one of claims 1 to 5.