CN219366372U

CN219366372U - Pneumatic reversing fan

Info

Publication number: CN219366372U
Application number: CN202321488744.3U
Authority: CN
Inventors: 李小霞; 王兆宇; 刘中银; 徐军领; 刘海涛
Original assignee: Shandong Yutai Intelligent Technology Co ltd
Current assignee: Shandong Yutai Intelligent Technology Co ltd
Priority date: 2023-06-13
Filing date: 2023-06-13
Publication date: 2023-07-18
Anticipated expiration: 2033-06-13

Abstract

The utility model discloses a pneumatic reversing fan, which relates to the technical field of fan reversing and comprises a seat body, wherein the seat body is annular, a plurality of through holes are formed in the circumferential direction of the seat body, fan blade shafts are arranged in a stepped shape, the fan blade shafts are arranged on the through holes of the seat body through plane bearings, a cylinder body and a connecting disc are respectively arranged at two ends of the seat body to form a cavity, and a piston is arranged in the cavity; an air inlet channel is arranged at the center of the cylinder body, an air inlet assembly is arranged in the air inlet channel, the air inlet assembly is connected with a high-pressure air source through an air pipe, and the high-pressure air source drives a piston to push a fan blade shaft to rotate for reversing; according to the pneumatic reversing fan provided by the utility model, the bearing at the reversing position of the fan is set as the plane bearing and is positioned by the end face of the base body, so that the reversing requirement of the fan blade can be met, the stress requirement of the centrifugal force of the fan blade with high rotating speed can be born, and the service life and higher reliability of the reversing fan are ensured.

Description

Pneumatic reversing fan

Technical Field

The utility model belongs to the technical field of fan reversing, and particularly relates to a pneumatic reversing fan.

Background

The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

Because of the special arrangement of the whole structure of the agricultural machine, the engine basically adopts an induced draft fan. By adopting the common air suction fan, sundries such as a pole blade, a fine wadding and the like are easy to be adsorbed in front of the water tank, manual cleaning is difficult, after the water tank is blocked, the air quantity becomes small, so that the temperature of the engine water is always at a higher temperature, even the engine water temperature is high, the engine cannot normally run, the service life of the engine and the use of the whole vehicle are seriously influenced, and huge negative influence is brought to the engine products of agricultural machinery.

At present, many agricultural machinery engines adopt reversing fans, and the fan is switched between air suction and air blowing by changing the blowing direction of the fan, so that sundries adsorbed on the surface of a water tank are blown away, as in a Chinese patent No. 217682364U, and a pneumatically controlled reversing fan is disclosed, as shown in FIG. 1, a fan blade shaft 1003 is mounted on a fan base 1001, the reversing of a fan blade 1004 is realized through the fan blade shaft 1003 and a rotary bearing 1002 for bearing a radial force N, and the capability of the rotary bearing for bearing the radial force N for bearing the axial force F is weaker. In the process of high-speed rotation of the whole direction-changing fan, due to the action of the centrifugal force F of each fan blade, the rotating bearing needs to bear larger axial force F in the centrifugal force direction, so that the bearing is easy to damage, the reliability of the direction-changing fan is poor, even the inner ring of the bearing falls off to cause each fan blade 1004 to fly out at a high speed along the centrifugal force F direction with the fan blade shaft 1003, and the engine or the whole vehicle is damaged.

Disclosure of Invention

The utility model aims to provide a pneumatic reversing fan, which uses a plane bearing to realize the function of reversing fan blades, meets the use requirement of centrifugal force generated when the reversing fan rotates at a high speed, and prolongs the service life and the reliability of the reversing fan.

In order to achieve the above object, the present utility model is realized by the following technical scheme:

in a first aspect, an embodiment of the present utility model provides a pneumatic reversing fan, where the base is annular, a plurality of through holes are provided in a circumferential direction of the base, fan blade shafts are provided in a stepped shape, the fan blade shafts are mounted on the through holes of the base through planar bearings, a cylinder body and a connecting disc are respectively provided at two ends of the base to form a cavity, and a piston is provided in the cavity; the center position of the cylinder body is provided with an air inlet channel, an air inlet assembly is arranged in the air inlet channel, the air inlet assembly is connected with a high-pressure air source through an air pipe, and the high-pressure air source drives a piston to push a fan blade shaft to rotate for reversing.

As a further technical scheme, the fan blade shaft is axially divided into a first section, a second section and a third section with diameters increased in sequence, the plane bearing is located in the second section, one surface of the plane bearing is abutted to a step of the third section, and the other surface of the plane bearing is abutted to the end surface of a step hole located on the circular surface of the base.

As a further technical scheme, an annular groove is formed in the cylinder body, the piston sleeve is arranged in the annular groove of the cylinder body, and a sealing ring is arranged between the cylinder body and the piston.

As a further technical scheme, an annular groove is formed in the piston, a return spring is arranged in the annular groove, one end of the return spring is abutted to the end face of the piston, and the other end of the return spring is abutted to the end face of the connecting disc.

As a further technical scheme, an eccentric hole is formed in the end face of the bottom of the fan blade shaft, a positioning pin is arranged in the eccentric hole, and the positioning pin is arranged in the floating block.

As a further technical scheme, a pressing plate is arranged on the piston, an annular track is formed between the pressing plate and the piston, and the floating block can slide in the annular track.

As a further technical scheme, the air inlet assembly comprises an air inlet joint, an air inlet pipeline, a sealing ring and a rotating bearing.

As a further technical scheme, the part of the fan blade shaft positioned outside the seat body is sleeved with a fan blade.

As a further technical scheme, the cylinder body and the connecting disc are respectively positioned at two ends of the seat body through the cooperation of the spigot, and are fixed through bolts.

The beneficial effects of the embodiment of the utility model are as follows:

the pneumatic reversing fan provided by the utility model has the advantages that the bearing at the reversing position of the fan is set to be a plane bearing, and the end face of the seat body is used for positioning, so that the reversing requirement of the fan blade can be met, the stress requirement of the centrifugal force of the fan blade with high rotating speed can be born, and the service life and higher reliability of the reversing fan are ensured.

According to the pneumatic reversing fan provided by the utility model, the fan blade shaft is arranged in a stepped shape, the fan blade shaft is axially and sequentially divided into the first section, the second section and the third section with the diameters being sequentially increased, the fan blade is fixed through the first section, the plane bearing is arranged on the second section, and the positioning is performed through the step of the third section and the plane bearing at the end face of the step hole in the base body, so that the problem of bearing falling caused by centrifugal force of the bearing can be effectively avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

FIG. 1 is a simplified schematic diagram of a pneumatically controlled reversing fan of the prior art;

in the figure, 1001, a fan base, 1002, a rotary bearing, 1003, a fan blade shaft, 1004, and fan blades;

FIG. 2 is a schematic view of the structure of the pneumatically commutated fan blade of the present utility model before the fan blade is commutated;

in the figure, a cylinder body 1, a sealing ring 2, a return spring 3, an air inlet assembly 4, a piston 5, a seat body 6, a connecting disc 7, a pressing plate 8, a floating block 9, a locating pin 10, a plane bearing 11, a fan blade shaft 12, a fan blade 13, a fan blade 14, an air pipe 101 and a cavity.

FIG. 3 is a schematic view of the air-operated reversing fan of the present utility model after the blades are reversed;

in the figure, 201. Gas seal chamber;

FIG. 4 is a schematic view of the structure of the base of the present utility model;

in the figure, 301. An outer circular surface, 302. An inner circular surface, 303. A through hole, 304. A circular end surface;

fig. 5 is a schematic diagram of the sealing method of the air-operated directional fan of embodiment 2.

Detailed Description

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.

Example 1

In an exemplary embodiment of the present utility model, as shown in fig. 2, there is provided a pneumatic reversing fan, which includes a base 6, a plurality of fan blade shafts 12 are mounted on the base 6, the fan blade shafts 12 are mounted on the base 6 through plane bearings 11, two ends of the base 6 are respectively provided with a cylinder body 1 and a connecting disc 7, and the cylinder body 1 and the connecting disc 7 are respectively positioned at two ends of the base 6 through spigot fitting and are fixed through bolts, so as to form a cavity 101.

As shown in fig. 2 and fig. 4, the base 6 is annular, a plurality of through holes 303 are uniformly distributed and processed along the outer circular surface 301, the inner circular surface 302 is processed with a circular end surface 304 with a certain depth corresponding to the plurality of holes, the fan blade shaft 12 is arranged in a stepped shape, the fan blade shaft 12 is axially and sequentially divided into a first section, a second section and a third section with sequentially increased diameters, the first section of the fan blade shaft 12 is radially provided with a plane and a fixed hole, the fan blade 13 is fixedly connected to the fan blade shaft 12 through the fixed hole, under the action of the plane bearing 11, the fan blade shaft 12 drives the fan blade 13 to complete rotation along the axis of the fan blade, the plane bearing 11 is positioned in the second section, one surface of the plane bearing 11 is abutted to the step of the third section, and the other surface is abutted to the end surface position of the step hole of the circular surface 302 in the base, and the plane bearing 11 is positioned with the end surface of the base 6, so that the requirements of reversing fan blade can be met, the stress of the fan blade on high-speed centrifugal force can be borne, and the service life and higher reliability of the reversing fan can be ensured.

The piston 5 is arranged in a cavity formed by the cylinder body 1, the connecting disc 7 and the seat body 6, in particular, an annular groove is formed in the cylinder body 1, the piston 5 is sleeved in the annular groove of the cylinder body 1, a sealing ring 2 is arranged between the cylinder body 1 and the piston 5, the sealing ring 2 can fill a gap between the cylinder body 1 and the piston 5 to play a sealing role, the annular groove is also formed in the piston 5, a return spring 3 is arranged in the annular groove, one end of the return spring 3 is abutted to the end face of the piston, the other end of the return spring is abutted to the end face of the connecting disc 7, the return spring 3 plays a role in applying positioning and rebound to the piston 5, and the return spring 3 is always in a compressed state when being in a pneumatic reversing fan cavity.

An eccentric hole is formed in the end face of the bottom of the fan blade shaft 12, a positioning pin 10 is arranged in the eccentric hole, the fan blade shaft 12 can rotate along the fan blade axis by stirring the positioning pin 10, a floating block 9 is sleeved on the leaked positioning pin 10 and can rotate freely, a pressing plate 8 is arranged on the piston 5, an annular track is formed between the pressing plate 8 and the piston 5, the floating block 9 falls on the annular track formed between the piston 5 and the pressing plate 8, the floating block 9 can slide in the annular track, and the pressing plate 8 and the piston 5 are fixed together at intervals, so that the floating block 9 can slide conveniently.

In this embodiment, the central point of cylinder body 1 puts and sets up the air inlet channel, sets up air inlet module 4 in the air inlet channel, and air inlet module 4 links to each other with high-pressure air source through trachea 14, and air inlet module 4 includes air inlet joint, air inlet pipe, sealing washer and swivel bearing, and air inlet pipe 14 links to each other with air inlet pipe through air inlet joint, and air inlet pipe sets up in the casing, and the casing sets up in the air inlet channel, sets up first O type sealing washer and second O type sealing washer between casing and the air inlet channel and seals, prevents that high-pressure air from leaking, and above structure constitutes rotary type airtight passageway jointly.

The reversing process of the pneumatic reversing fan provided by the embodiment is as follows:

in actual operation, the fan rotates at a high speed, as shown in fig. 2, and the fan blades are reversed in the forward direction by the pneumatic reversing fan, and the wind direction is the direction of M.

As shown in fig. 3, high-pressure gas G passes through the gas pipe 14 and the gas inlet assembly 4, extrudes the piston 5, overcomes the tension of the return spring 3, forms a gas seal cavity 201, and the displacement of the end surface of the piston 5 pushes the floating block 9 to rotate the positioning pin 10, so that the fan blade shaft 12 drives the fan blade 13 to change the angle due to the eccentric action, and the direction of the wind after reversing is as K direction.

The high-pressure gas G is removed, the piston 5 is pushed to drag the pressing plate 8 under the tension action of the return spring 3, the pressing plate 8 pushes the floating block 9 to move towards the cylinder body 1, the positioning pin 10 rotates, the fan blade shaft 12 drives the fan blade 13 due to the eccentric action, the resetting process of the fan blade is completed, and the wind direction K is changed into the M direction.

Example 2

As shown in fig. 5, unlike in embodiment 1, the seal ring 2 is disposed on the outer circumference of the cylinder, and the other structures are the same as those in embodiment 1, and the operation is the same as that in embodiment 1, and will not be repeated here.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The pneumatic reversing fan is characterized by comprising a seat body, wherein the seat body is annular, a plurality of through holes are formed in the circumferential direction of the seat body, fan blade shafts are arranged in a stepped shape, the fan blade shafts are arranged on the through holes of the seat body through plane bearings, a cylinder body and a connecting disc are respectively arranged at two ends of the seat body to form a cavity, and a piston is arranged in the cavity; the center position of the cylinder body is provided with an air inlet channel, an air inlet assembly is arranged in the air inlet channel, the air inlet assembly is connected with a high-pressure air source through an air pipe, and the high-pressure air source drives a piston to push a fan blade shaft to rotate for reversing.

2. The air-operated reversing fan as set forth in claim 1, wherein said fan blade shaft is divided into a first segment, a second segment and a third segment with diameters sequentially increased in the axial direction, a planar bearing is disposed in the second segment, one face of the planar bearing is abutted against a step of the third segment, and the other face is abutted against a step hole end face position of a circular face in the housing.

3. The air-operated directional fan as set forth in claim 1, wherein said cylinder is provided with an annular groove, a piston sleeve is provided in the annular groove of the cylinder, and a sealing ring is provided between said cylinder and the piston.

4. The air-operated reversing fan as set forth in claim 1, wherein an annular groove is provided on said piston, a return spring is provided in said annular groove, one end of said return spring is abutted against the end face of the piston, and the other end is abutted against the end face of the connecting disc.

5. The air-operated reversing fan as set forth in claim 1, wherein an eccentric hole is provided in a bottom end surface of said blade shaft, a positioning pin is installed in said eccentric hole, and said positioning pin is provided in said slider.

6. The air-operated directional fan as set forth in claim 5, wherein a pressure plate is provided on said piston, an annular track is formed between said pressure plate and the piston, and said slider is slidable in the annular track.

7. The air operated directional fan as set forth in claim 1, wherein said air intake assembly includes an air intake fitting, an air intake duct, a seal ring, and a swivel bearing.

8. The air-operated reversing fan as set forth in claim 1, wherein a portion of said fan blade shaft located outside of said housing is sleeved with fan blades.

9. The air-operated reversing fan as set forth in claim 1, wherein the cylinder and the connection disc are respectively positioned at both ends of the base body by the cooperation of the spigot and are fixed by bolts.