A low-noise fan specially used for automatic car washing machine and its assembly method

Abstract

The present invention discloses a low-noise fan specially used for an automatic car washing machine, which comprises a fan cover, a motor and a fan impeller; the fan impeller comprises a plurality of blades, a connecting sleeve and an air inlet end impeller disk and an inner end impeller disk arranged relatively; the inner end impeller disk is sleeved on the output shaft of the motor and is keyed to the connecting sleeve at the outer end of the output shaft, wherein the connecting sleeve is fixedly connected to the inner end impeller disk; wherein the blades are divided into a first group of blades and a second group of blades, the second group of blades and the first group of blades are arranged alternately, the second group of blades are made of vulcanized rubber, and the second group of blades have tensile prestress; the vulcanized rubber material blade intervals are ingeniously used to replace the traditional metal material blades, which significantly reduces the dead weight of the fan impeller; on the one hand, the manufacturing process will not destroy the balance of the fan impeller, and on the other hand, the weight of the fan impeller is significantly reduced, and even if there is a slight vibration during operation, the connecting sleeve will not be damaged.

Description

Background Art

[0001] The present invention relates to the technical field of automatic car washers, and in particular to a low-noise fan dedicated to an automatic car washer and an assembly method thereof. Technical Field

[0002] At present, the number of cars in China has greatly increased. With the increase in labor costs, the comprehensive cost of the car washing industry has also greatly increased. For this reason, the car washing industry, especially medium and large-scale stores, are now equipped with automatic car washing equipment; domestic automatic car washing equipment is equipped with several fans to dry the sides and top of the car after washing.

[0003] Existing fans are all composed of a fan cover, a fan impeller and a motor, wherein the fan impeller is composed of an end plate, blades connected to the end plate and a sleeve keyed to the motor output shaft. During the manufacturing process, it is necessary to knock the outer end of the sleeve to make it keyed to the output shaft. However, since the sleeve is rigidly connected to the end plate and the blades, this destroys the balance of the fan impeller. In addition, the material is made of metal and has a large weight. After long-term operation, as long as there is a slight imbalance, the sleeve will deform, which will eventually lead to vibration of the fan impeller, abnormal noise during operation, etc. Summary of the invention

[0004] One of the purposes of the present invention is to provide a low-noise fan specially designed for an automatic car washing machine. The connecting sleeve and the fan impeller are designed separately. During the manufacturing process, the fan impeller is first inserted, and then the connecting sleeve is connected to the output shaft by a key. Finally, the inner end impeller disk of the impeller fan is pressed against the connecting sleeve and fixed by bolts or welding. In addition, it ingeniously uses vulcanized rubber blade spacers to replace traditional metal blades, which significantly reduces the dead weight of the fan impeller. On the one hand, the manufacturing process will not destroy the balance of the fan impeller, and on the other hand, the weight of the fan impeller is significantly reduced, and even if there is some vibration during operation, the connecting sleeve will not be damaged.

[0005] In order to solve the technical problems of short service life, abnormal working noise and heavy weight of the fan of the car washing machine in the prior art, the present invention provides a low-noise fan dedicated to the automatic car washing machine, which includes a fan cover, a motor installed on the back of the fan cover and a fan impeller installed in the inner cavity of the fan cover;

[0006] The fan cover includes a circumferential ring plate, an air inlet end ring plate arranged on the front of the circumferential ring plate, a mounting back plate arranged on the back of the circumferential ring plate, and an exhaust pipe arranged on the peripheral side of the circumferential ring plate;

[0007] The motor is fixedly mounted on the outer end of the mounting back plate, and the output shaft passes through the mounting back plate and extends into the inner cavity of the fan cover;

[0008] The fan impeller comprises a plurality of blades, a connecting sleeve, and an air inlet end impeller disk and an inner end impeller disk arranged relatively; the blades are connected between the air inlet end impeller disk and the inner end impeller disk, and the blades are radially distributed on the disk surface of the inner end impeller disk with the central axis of the inner end impeller disk as the axis, the blades are perpendicular to the disk surface of the inner end impeller disk, a circular air inlet is provided at the center of the air inlet end impeller disk, the inner end impeller disk is sleeved on the output shaft of the motor, and the connecting sleeve is keyed to the outer end of the output shaft, wherein the connecting sleeve is fixedly connected to the inner end impeller disk;

[0009] The blades are divided into a first group of blades and a second group of blades, the second group of blades are arranged alternately with the first group of blades, the second group of blades are made of vulcanized rubber, and the second group of blades have tensile prestress.

[0010] Preferably, in order to improve the overall strength of the fan impeller, the present invention provides a low-noise fan specially used for an automatic car washing machine, wherein the cross-section of the impeller disc at the air inlet end is arc-shaped, and the arc-shaped opening faces the outer end. Such a design increases the connection area between the blades and the impeller disc at the air inlet end, and significantly enhances the overall strength.

[0011] Furthermore, considering that the fan impeller will inevitably produce unbalanced swing after long-term operation, the traditional hard connection method will aggravate this phenomenon. The present invention provides a low-noise fan dedicated to an automatic car washing machine, wherein the connecting sleeve includes an output shaft sleeve and an impeller disk connecting flange integrally formed on the outer periphery of the output shaft sleeve, and the connecting sleeve is opened along the busbar, which is equivalent to a spring sleeve, and can absorb and alleviate the swing to a certain extent.

[0012] Preferably, in order to further enhance the anti-vibration and shock-absorbing capability of the fan impeller part, the present invention provides a low-noise fan specially used for an automatic car washing machine, wherein the inner ring diameter of the connecting sleeve gradually increases from the inner end to the outer end, a vulcanized rubber layer is cast on the inner ring surface of the connecting sleeve, and the thickness of the vulcanized rubber layer gradually increases from the inner end to the outer end so that the inner ring diameter is equal to the outer diameter of the output shaft. On the one hand, this design enables the inner ring surface of the connecting sleeve to fit closely to the output shaft, and on the other hand, when the fan impeller swings, the fan impeller drives the connecting sleeve to swing, and the vulcanized rubber layer gradually thickens from the inside to the outside, which will significantly absorb the vibration energy and reduce the vibration.

[0013] Preferably, in order to enhance the connection strength between the vulcanized rubber layer and the inner ring surface of the connecting sleeve, the present invention provides a low-noise fan dedicated to an automatic car washing machine, wherein a mesh grille groove is provided on the inner ring surface of the connecting sleeve.

[0014] Furthermore, the present invention provides a low-noise fan dedicated to an automatic car washing machine, which also includes a first annular magnet and a second annular magnet, wherein the first annular magnet is sleeved on the output shaft and fixedly installed on the inner wall of the mounting back plate, and the second annular magnet is sleeved on the output shaft and fixedly installed on the inner end impeller disk, wherein the first annular magnet and the second annular magnet are arranged with the same poles repelling each other; the above design takes into account that the fan cover is in a stationary state during the operation of the fan, and the first annular magnet is fixedly installed on the inner wall of the mounting back plate and is also in a static state. When the second annular magnet arranged in a repelling manner on the fan impeller swings with the fan impeller, the mutually repelling force of the two magnets will limit the fan impeller to a certain extent in a force balance state, thereby avoiding the noise caused by unbalanced rotation.

[0015] Furthermore, for the sake of safety hazards and air guide efficiency, the present invention provides a low-noise fan specially designed for an automatic car washing machine, which also includes a funnel-shaped air inlet cover, the outer edge of the funnel mouth is fixedly connected to the air inlet end ring plate, and the funnel mouth passes through the circular air inlet and ends at the central area of ​​the fan impeller.

[0016] Furthermore, the fan cover shell is generally relatively thin. If the mounting back plate of the fan cover is directly bolted to the motor, tearing or deformation may occur due to long-term weak vibrations. The present invention provides a low-noise fan specially used for an automatic car washing machine. In order to improve the connection reliability, the low-noise fan also includes a connecting plate connected between the mounting back plate and the motor.

[0017] The low-noise fan specially used for automatic car washing machines of the present invention has the following advantages over the prior art: the fan impeller blades of the present invention adopt the method of two groups of blades arranged at intervals, and one group is made of vulcanized rubber and has tensile prestress. On the one hand, the blade material adopts vulcanized rubber instead of traditional metal material, which significantly reduces the weight of the fan impeller and reduces the destructive force of slight vibration on the fan impeller. On the other hand, the vulcanized rubber has tensile prestress, which can reliably tighten the impeller disc at the air inlet end and the impeller disc at the inner end, making the overall structure more compact. In addition, the fan impeller is different from the traditional structure that is directly keyed to the output shaft of the motor through a central hard-connected shaft sleeve. In the manufacturing process, a connecting sleeve structure is separately added, and the connecting sleeve is knocked to achieve a key connection with the output shaft, and then the fan impeller is connected to the connecting sleeve, thereby avoiding destroying the balance of the fan impeller that has been dynamically balanced, thereby reducing the operating noise of the fan impeller from the root.

[0018] Another object of the present invention is to provide an assembly method, which is to eliminate the stress concentration phenomenon caused by knocking the connecting sleeve during the manufacturing process, referring to the quenching and tempering process during the quenching and tempering treatment of steel, so that the structure is more reliable and the operating decibel is at a lower level; the present invention also provides an assembly method, which includes the following steps:

[0019] Prepare the motor, fan cover, fan impeller and connecting sleeve;

[0020] Bolt the fan cover to the motor, and extend the motor output shaft through the fan cover into the inner cavity of the fan cover;

[0021] Put the fan impeller into the inner cavity of the fan cover and cover it on the output shaft;

[0022] Put the connecting sleeve on the end of the output shaft and tap the outer end of the connecting sleeve to install it in place;

[0023] Adjust the opening of the connecting sleeve to face upward;

[0024] pouring hot melt rubber into the opening;

[0025] After the hot melt rubber is cooled to room temperature and solidified, the inner end impeller disc of the fan impeller is sleeved on the connecting sleeve, and the connecting sleeve and the fan impeller are fixedly connected by bolts.

[0026] The above method refers to the stress concentration phenomenon generated by steel after quenching, and then eliminates the stress concentration through tempering treatment to achieve better quality. The connecting sleeve of the present invention is deformed after knocking, which is easy to cause stress concentration at the opening of the connecting sleeve. At this time, high-temperature hot-melt rubber is poured at the opening. On the one hand, the connecting sleeve is heated to eliminate the opening stress. On the other hand, the hot-melt rubber makes the connection between the connecting sleeve and the output shaft more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is an exploded view of the structure of a low-noise fan dedicated to an automatic car washing machine of the present invention;

[0028] Figure 2 for Figure 1 Another structural schematic diagram of the orientation;

[0029] Figure 3 A schematic diagram of the blade structure of a low-noise fan dedicated to an automatic car washing machine of the present invention;

[0030] Figure 4 The present invention is a schematic diagram of the cross-sectional structure of a connecting sleeve of a low-noise fan specially used for an automatic car washing machine.

[0031] Among them: 1. fan cover; 100, circumferential ring plate; 101, air inlet end ring plate; 102, mounting back plate; 103, exhaust duct; 2. motor; 3. fan impeller; 300, blades; 3000, first group of blades; 3001, second group of blades; 301, connecting sleeve; 3010, output shaft sleeve; 3011, impeller disk connecting flange; 302, air inlet end impeller disk; 3020, circular air inlet; 303, inner end impeller disk; 4, funnel-shaped air inlet cover; 5, connecting plate; 6, vulcanized rubber layer; 7, first annular magnet; 8, second annular magnet. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings: Example

[0033] As shown in the figure, this embodiment provides a low-noise fan dedicated to an automatic car washing machine, which includes a fan cover 1, a motor 2 installed on the back of the fan cover 1, and a fan impeller 3 installed in the inner cavity of the fan cover 1;

[0034] The fan cover 1 includes a circumferential ring plate 100, an air inlet end ring plate 101 arranged on the front of the circumferential ring plate 100, a mounting back plate 102 arranged on the back of the circumferential ring plate 100, and an exhaust pipe 103 arranged on the peripheral side of the circumferential ring plate 100;

[0035] The motor 2 is fixedly mounted on the outer end of the mounting back plate 102, and the output shaft passes through the mounting back plate 102 and extends into the inner cavity of the fan cover 1;

[0036] The fan impeller 3 includes a plurality of blades 300, a connecting sleeve 301, and an air inlet end impeller disc 302 and an inner end impeller disc 303 arranged relatively; the blades 300 are connected between the air inlet end impeller disc 302 and the inner end impeller disc 303, and the blades 300 are radially distributed on the disk surface of the inner end impeller disc 303 with the central axis of the inner end impeller disc 303 as the axis, the blades 300 are perpendicular to the disk surface of the inner end impeller disc 303, and the center of the air inlet end impeller disc 302 opens a circular shaped air inlet 3020, the inner end impeller disk 303 is sleeved on the output shaft of the motor 2, and the connecting sleeve 301 is keyed to the outer end of the output shaft, wherein the connecting sleeve 301 is fixedly connected to the inner end impeller disk 303, wherein the connecting sleeve 301 includes an output shaft sleeve 3010 and an impeller disk connecting flange 3011 integrally formed on the outer periphery of the output shaft sleeve 3010, and the connecting sleeve 301 is opened along the generatrix, which is equivalent to a spring sleeve, and can absorb and alleviate the swing to a certain extent;

[0037] The blades 300 are divided into a first group of blades 3000 and a second group of blades 3001 . The second group of blades 3001 are arranged alternately with the first group of blades 3000 . The second group of blades 3001 are made of vulcanized rubber and have tensile prestress.

[0038] At the same time, in order to improve the overall strength of the fan impeller 3, the cross-section of the impeller disk 302 at the air inlet end in this embodiment is arc-shaped, and the arc opening faces the outer end. This design increases the connection area between the blade 300 and the impeller disk 302 at the air inlet end, and significantly improves the overall strength.

[0039] Furthermore, for the sake of safety hazard and air guiding efficiency, the present embodiment also includes a funnel-shaped air inlet cover 4, the outer edge of the funnel mouth is fixedly connected to the air inlet end ring plate 101, and the funnel mouth passes through the circular air inlet 3020 and ends at the central area of ​​the fan impeller 3.

[0040] Furthermore, the fan cover shell is generally relatively thin. If the mounting back plate 102 of the fan cover 1 is directly bolted to the motor 2, tearing or deformation may occur during long-term weak vibrations. In order to improve the connection reliability, this embodiment also includes a connecting plate 5, which is connected between the mounting back plate 102 and the motor 2.

[0041] The blades 300 of the fan impeller 3 of this embodiment are arranged in two groups at intervals, and one group is made of vulcanized rubber and has tensile prestress. On the one hand, the blade material uses vulcanized rubber instead of traditional metal material, which significantly reduces the weight of the fan impeller and reduces the destructive force of slight vibration on the fan impeller 3. On the other hand, the vulcanized rubber has tensile prestress, which can reliably tighten the impeller disk 302 at the air inlet end and the impeller disk 303 at the inner end, making the overall structure more compact. In addition, the fan impeller 3 is different from the traditional structure that is directly keyed to the motor output shaft through a central hard-connected shaft sleeve. During the manufacturing process, a connecting sleeve 301 structure is separately added, and the connecting sleeve 301 is knocked to achieve a key connection with the output shaft, and then the fan impeller 3 is connected to the connecting sleeve 301, thereby avoiding destroying the balance of the fan impeller 3 that has been dynamically balanced, thereby reducing the operating noise of the fan impeller 3 from the root. Example

[0042] In order to further enhance the anti-vibration and shock-absorbing capability of the fan impeller, in the present embodiment, the inner diameter of the connecting sleeve 301 gradually increases from the inner end to the outer end, a vulcanized rubber layer 6 is cast on the inner surface of the connecting sleeve 301, and the thickness of the vulcanized rubber layer 6 gradually increases from the inner end to the outer end so that the inner diameter of the vulcanized rubber layer 6 is equal to the outer diameter of the output shaft. On the one hand, this design enables the inner surface of the connecting sleeve 301 to fit closely to the output shaft. On the other hand, when the fan impeller 3 swings, the fan impeller 3 drives the connecting sleeve 301 to swing, and the vulcanized rubber layer 6 gradually thickens from the inner end to the outside, which will significantly absorb vibration energy and reduce vibration.

[0043] At the same time, in order to enhance the connection strength between the vulcanized rubber layer 6 and the inner ring surface of the connecting sleeve 301 , a mesh grille groove (not shown in the figure) is provided on the inner ring surface of the connecting sleeve 301 in this embodiment.

[0044] Furthermore, the present embodiment also includes a first annular magnet 7 and a second annular magnet 8, wherein the first annular magnet 7 is sleeved on the output shaft and fixedly mounted on the inner wall of the mounting back plate 102, and the second annular magnet 8 is sleeved on the output shaft and fixedly mounted on the inner end impeller disk 303, wherein the first annular magnet 7 and the second annular magnet 8 are arranged with the same poles and repelling each other; the above design takes into account that the fan cover 1 is in a stationary state during the operation of the fan, the first annular magnet 7 is fixedly mounted on the inner wall of the mounting back plate 102, and is also in a static state, when the second annular magnet 8, which is arranged to repel each other on the fan impeller 3, swings with the fan impeller 3, the mutual repulsive force of the two magnets will limit the fan impeller 3 to a certain extent to be in a force balance state, thereby avoiding the noise caused by unbalanced rotation.

[0045] The remaining structures are the same as those in Embodiment 1 and will not be described in detail here.

[0046] In order to eliminate the stress concentration phenomenon caused by knocking the connecting sleeve during the manufacturing process, this embodiment refers to the quenching and tempering process during the quenching and tempering treatment of steel to make its structure more reliable and the operating decibel level at a lower level; it also provides an assembly method for a low-noise fan dedicated to an automatic car washing machine, including the following steps:

[0047] Prepare the motor 2, the fan cover 1, the fan impeller 3 and the connecting sleeve 301;

[0048] Bolt the fan cover 1 to the motor 2, and extend the output shaft of the motor 2 through the fan cover 1 into the inner cavity of the fan cover 1;

[0049] Put the fan impeller 3 into the inner cavity of the fan cover 1 and cover it on the output shaft;

[0050] Put the connecting sleeve 301 on the end of the output shaft, and tap the outer end of the connecting sleeve 301 to install it in place;

[0051] Adjust the opening of the connecting sleeve 301 to face upward;

[0052] pouring hot melt rubber into the opening;

[0053] After the hot melt rubber is cooled to room temperature and solidified, the inner end impeller disc 303 of the fan impeller 3 is sleeved on the connecting sleeve 301, and the connecting sleeve 301 and the fan impeller 3 are fixedly connected by bolts.

[0054] The above method refers to the stress concentration phenomenon generated by steel after quenching, and then the stress concentration is eliminated through tempering treatment to achieve better quality. The connecting sleeve 301 of the present invention is deformed after being knocked, which is easy to cause stress concentration at the opening of the connecting sleeve 301. At this time, high-temperature hot-melt rubber is poured at the opening. On the one hand, the connecting sleeve 301 is heated to eliminate the opening stress. On the other hand, the hot-melt rubber makes the connection between the connecting sleeve 301 and the output shaft more reliable.

[0055] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the 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 spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A low-noise fan for an automatic car washing machine, characterized by: It includes a fan cover, a motor installed on the back of the fan cover, and a fan impeller installed in the inner cavity of the fan cover; The fan cover includes a circumferential ring plate, an air inlet end ring plate arranged on the front of the circumferential ring plate, a mounting back plate arranged on the back of the circumferential ring plate, and an exhaust pipe arranged on the peripheral side of the circumferential ring plate; The motor is fixedly mounted on the outer end of the mounting back plate, and the output shaft passes through the mounting back plate and extends into the inner cavity of the fan cover; The fan impeller comprises a plurality of blades, a connecting sleeve, and an air inlet end impeller disk and an inner end impeller disk arranged relatively; the blades are connected between the air inlet end impeller disk and the inner end impeller disk, and the blades are radially distributed on the disk surface of the inner end impeller disk with the central axis of the inner end impeller disk as the axis, the blades are perpendicular to the disk surface of the inner end impeller disk, a circular air inlet is provided at the center of the air inlet end impeller disk, the inner end impeller disk is sleeved on the output shaft of the motor, and the connecting sleeve is keyed to the outer end of the output shaft, wherein the connecting sleeve is fixedly connected to the inner end impeller disk; The blades are divided into a first group of blades and a second group of blades, the second group of blades and the first group of blades are arranged alternately, the second group of blades are made of vulcanized rubber, and the second group of blades have tensile prestress; The connecting sleeve includes an output shaft sleeve and an impeller disk connecting flange integrally formed on the outer periphery of the output shaft sleeve, and the connecting sleeve is opened along the generatrix; the inner ring diameter of the connecting sleeve gradually increases from the inner end to the outer end, a vulcanized rubber layer is cast on the inner ring surface of the connecting sleeve, and the thickness of the vulcanized rubber layer gradually increases from the inner end to the outer end so that the inner ring diameter is equal to the outer diameter of the output shaft.

2. The low-noise fan for automatic car washing machine according to claim 1 is characterized by: The cross section of the impeller disc at the air inlet end is arc-shaped, and the arc-shaped opening faces the outer end.

3. The low-noise fan for automatic car washing machine according to claim 1 is characterized by: A mesh grille groove is provided on the inner ring surface of the connecting sleeve.

4. The low-noise fan for automatic car washing machine according to any one of claims 1 to 3, characterized in that: It also includes a first annular magnet and a second annular magnet, wherein the first annular magnet is sleeved on the output shaft and fixedly mounted on the inner wall of the mounting back plate, and the second annular magnet is sleeved on the output shaft and fixedly mounted on the inner end impeller disk, wherein the first annular magnet and the second annular magnet are arranged with the same poles and repel each other.

5. The low-noise fan for automatic car washing machine according to claim 4, characterized in that: It also includes a funnel-shaped air inlet cover, the outer edge of the funnel opening is fixedly connected to the air inlet end ring plate, and the funnel mouth passes through the circular air inlet and ends at the central area of ​​the fan impeller.

6. The low-noise fan for automatic car washing machine according to claim 4, characterized in that: It also includes a connecting plate, which is connected between the mounting back plate and the motor.

7. An assembly method, involving the low-noise fan for automatic car washing machine according to claim 1 or 3, characterized in that: The following steps are involved: Prepare the motor, fan cover, fan impeller and connecting sleeve; Bolt the fan cover to the motor, and extend the motor output shaft through the fan cover into the inner cavity of the fan cover; Put the fan impeller into the inner cavity of the fan cover and cover it on the output shaft; Put the connecting sleeve on the end of the output shaft and tap the outer end of the connecting sleeve to install it in place; Adjust the opening of the connecting sleeve to face upward; pouring hot melt rubber into the opening; After the hot melt rubber is cooled to room temperature and solidified, the inner end impeller disc of the fan impeller is sleeved on the connecting sleeve, and the connecting sleeve and the fan impeller are fixedly connected by bolts.

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