CN112814940A

CN112814940A - Centrifugal fan welded impeller, machining method and machining device

Info

Publication number: CN112814940A
Application number: CN202110006653.0A
Authority: CN
Inventors: 张震; 张生涛; 刘玲玲; 刘长青; 郭腾
Original assignee: Shandong Zhangqiu Blower Co Ltd
Current assignee: Shandong Zhangqiu Blower Co Ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2021-05-18
Anticipated expiration: 2041-01-05
Also published as: CN112814940B

Abstract

A centrifugal fan welded impeller, a machining method and a machining device are used for facilitating welding and fixing of an impeller with a small air outlet so as to ensure structural strength after welding. The impeller includes reel, inlet ring, blade, preceding dish and back plate, characterized by, the blade includes long blade and short blade, and long, short blade all sets up in the front between dish and the back plate and evenly set up on same circumference, and long blade sets up with short blade interval, is equipped with the picture peg at long, short blade lateral wall, is equipped with the first jack that corresponds with picture peg on the long blade on the back plate, still is equipped with the second jack that corresponds with picture peg on the short blade on the back plate. The impeller welding fixture can facilitate welding processing of the impeller, is particularly suitable for processing the impeller with a small air outlet, and is convenient for positioning and fixing the inlet ring and the front disc and positioning and fixing the rear disc and the shaft disc due to the arrangement of the processing device.

Description

Centrifugal fan welded impeller, machining method and machining device

Technical Field

The invention relates to the technical field of centrifugal fans, in particular to a welded impeller of a centrifugal fan, a machining method and a machining device.

Background

With the promotion of the industrialization process in China, the industrial industry is developing energy conservation and consumption reduction greatly, carrying out industrial upgrading and integration recombination, and industrial basic equipment needs to be updated in large quantity. The centrifugal fan is used as an important industrial matched device and is more applied to the fields of electric power, cement, petrochemical industry, coal mines, environmental protection and the like. Under the new economic development situation, the centrifugal fan industry will continue to keep increasing rapidly in the future. The multistage centrifugal fan is an important form of the centrifugal fan, and has the advantages of small volume, low noise, stable and reliable operation of the fan and high efficiency. The impeller is used as the heart of the centrifugal fan, the mass of the impeller is directly related to the performance of the fan, and the impeller plays an important role in the operation of the centrifugal fan. The impeller comprises a front disc, a rear disc, blades, an inlet ring and a shaft disc. In view of safety and reliability, the welding method is often used for manufacturing.

The sequence of welding the impeller in the prior art is as follows: firstly, marking the positions of blades on a rear disc, welding the rear disc and the blades according to the marking, cleaning welding slag and the like, then welding and fixing the whole formed by the rear disc and the blades and a front disc and cleaning the welding slag, and finally welding the whole formed by the front disc, the blades and the rear disc and a shaft disc and cleaning the welding slag. However, for the impeller with a small welding air outlet width, the problem that the welding gun cannot extend into the impeller from the air outlet of the impeller, so that the impeller cannot be welded firmly, and the structural strength of the impeller and the safety and reliability of the impeller are affected is solved.

Disclosure of Invention

The invention aims to provide a centrifugal fan welded impeller, a machining method and a machining device, which are used for conveniently welding and fixing the impeller with a small air outlet so as to ensure the structural strength after welding.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a centrifugal fan welded impeller, it includes reel, import circle, blade, preceding dish and back plate, characterized by, the blade includes long blade and short blade, and long, short blade all sets up in the front between dish and the back plate and evenly set up on same circumference, and long blade sets up with short blade interval, is equipped with the picture peg at long, short blade lateral wall, is equipped with the first jack that corresponds with picture peg on the long blade on the back plate, still is equipped with the second jack that corresponds with picture peg on the short blade on the back plate.

Furthermore, the width of the first jack and the width of the second jack are larger than that of the plug board.

Furthermore, the outer wall of the shaft disc is provided with a convex edge which is in contact with the end face of the rear disc.

Further, the front disc is of a conical structure.

Further, the end face of the inlet ring is in contact with the small end face of the front disc.

A processing method for welding an impeller of a centrifugal fan is characterized by comprising the following steps:

(1) forging an inlet ring and a shaft disc, and roughly turning to corresponding sizes;

(2) the long and short blades, the front disc and the rear disc are blanked by plasma, wherein the front disc is welded into a cone;

(3) correspondingly welding the front disc and the inlet ring, and polishing a welding seam to be smooth;

(4) equally dividing and marking the inner circle and the outer circle of the front disc, and drawing a blade position line by using a marking template according to the equally divided marks;

(5) sequentially placing the long and short blades on corresponding position lines on the front disc, welding the front disc and the long and short blades, and then polishing burrs;

(6) welding the whole obtained in the step (5) with the rear disc, inserting the inserting plates on the long and short blades into the corresponding first or second inserting holes during welding to ensure that the welding line fills the gaps between the blades and the inserting holes and is as high as the surface of the rear disc, and then cleaning welding slag and high points;

(7) welding the whole obtained in the step (6) with a shaft disc, and polishing a welding seam;

(8) and machining the impeller to a corresponding size according to a design drawing.

A processing device for welding an impeller by a centrifugal fan is characterized by comprising a first fixer and a second fixer which are fixedly connected, wherein a plurality of positioning blocks are relatively and slidably arranged on the first fixer and the second fixer along the radial direction, and an adjusting unit for driving the positioning blocks to move and position is arranged between the positioning blocks and the first fixer or the second fixer; the periphery of the first fixer is provided with pressing plates with the same number as the long blades of the impeller, and a translation mechanism for driving the pressing plates to be close to or far away from the impeller is arranged between the pressing plates and the first fixer.

Furthermore, the translation mechanism comprises a lead screw rotatably connected with the first fixer, a lead screw nut matched with the lead screw and slidably connected with the first fixer, and a plurality of connecting rods fixed on the lead screw nut, wherein the connecting rods correspond to and are connected with the pressing plates one to one, and the pressing plates are provided with straight grooves.

Furthermore, the adjusting unit comprises a driving wheel in threaded connection with the first or second fixer, a plurality of driving blocks fixed on the outer wall of the driving wheel, a plurality of hanging plates fixed above the outer wall of the driving wheel, a mandril fixedly connected with the positioning block, a spring arranged between the first end of the mandril and the first fixer, a driving rod fixed on the second end of the mandril, a connecting rod hinged with the second end of the driving rod, and a hook fixed on the connecting rod, wherein a groove matched with the hook is arranged on the hanging plates.

Furthermore, the positioning block is fixed at the first end of the ejector rod, a sliding rod is fixed at the second end of the ejector rod, an ear plate and a driving rod are fixed on the sliding rod, and the connecting rod is hinged with the ear plate.

The invention has the beneficial effects that: the centrifugal fan welded impeller, the machining method and the machining device provided by the invention can facilitate the welding machining of the whole impeller, and are particularly suitable for the welding machining of the impeller with a small air outlet. The relative fixation between the inlet ring and the front disc can be facilitated, so that the welding is facilitated, and the welding machining precision is improved; the relative fixation between the rear disc and the shaft disc can be facilitated, and the integral machining precision is further facilitated. The number of the pressing plates is equal to that of the long blades, and the outer circle and the inner circle of the front disc can be equally divided when the pressing plates are internally scribed, so that the positions of the long blades and the short blades can be scribed conveniently.

Drawings

FIG. 1 is a cross-sectional view of an impeller of the present invention;

FIG. 2 is a schematic view of the distribution of the blades of the present invention on the impeller;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is an axial schematic view of the rear disk;

FIG. 5 is a cross-sectional view of the processing device;

FIG. 6 is an axial view of the positioning block and the first fixture;

FIG. 7 is an axial schematic view of the drive wheel;

FIG. 8 is an assembly view of the carrier rod and the connecting rod;

FIG. 9 is a schematic view of the processing device holding the front disk and the inlet ring;

FIG. 10 is a schematic view of the processing device clamping the spindle hub and the inlet ring;

in the figure: 1 reel, 2 inlet rings, 3 front disks, 4 rear disks, 41 first jacks, 42 second jacks, 5 long blades, 51 short blades, 6 welding seams, 7 first fixers, 71 handles, 72 spring grooves, 721 limit grooves, 722 sliding grooves, 723 lead screw nut grooves, 73 ejector pins, 731 spring plates, 732 sliding plates, 74 positioning blocks, 75 hooks, 751 lug plates, 752 connecting rods, 76 driving rods, 77 lead screw nuts, 771 connecting rods, 772 pressing plates, 78 lead screws, 781 first handles, 79 driving wheels, 791 second handles, 792 hanging plates, 793 driving blocks, 794 grooves, 8 second fixers and 9 connecting rings.

Detailed Description

As shown in fig. 1 to 4, the impeller of the present invention includes a shaft disc 1, an inlet ring 2, a front disc 3, a rear disc 4, long blades 5 and short blades 51, and the impeller of the present invention and the method of manufacturing the same will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 4, a shaft disc 1 is a central part of the whole impeller, an inlet ring 2 is arranged on the outer side of the shaft disc, and the inlet ring and the shaft disc are relatively and fixedly connected together through a front disc, a rear disc and blades. The inlet ring and the shaft disc are both processed in a forging mode. The front disc 3 is of a conical structure, the small end of the front disc is used for being in contact with the end face of the inlet ring, and the contact point of the front disc and the inlet ring is fixedly connected through welding. The back disk 4 is of a circular ring structure, and a circular hole is formed in the center of the back disk. The back plate is contacted with the shaft disc, one part of the shaft disc extends into the round hole of the back plate, and the outer wall of the shaft disc is provided with an annular convex edge which is contacted with the end surface of the back plate. The contact point welding fixed connection between the axis dish and the back plate is equipped with a plurality of long blades 5 and short blades 51 between preceding dish and the back plate, and long blades and short blades interval set up. To facilitate the assembly of the long and short blades, insert plates 52 are provided on the sides of the long and short blades, the insert plates being in the nature of outwardly extending projections of the long and short blades. A plurality of first jacks 41 corresponding to each long blade and a plurality of second jacks 42 corresponding to each short blade are arranged on the rear disk, and the first jacks and the second jacks are used for being connected with the plugboard in an inserting way. When the long blade and the short blade are used, the long blade or the short blade and the rear disc are in an approximately vertical state after the inserting plates are inserted into the corresponding first inserting plates or second inserting plates, and the long blade and the rear disc and the short blade and the rear disc can be welded at the moment. The width of the first jack and the second jack is larger than that of the inserting plate, so that welding is facilitated. Because the welding seams 6 between the shaft disc and the rear disc, between the rear disc and the long blades, between the rear disc and the short blades and between the inlet ring and the front disc are two, the integral structural strength after welding is increased.

The processing method of the present invention is described below:

The impeller with the small air outlet width and the welding gun incapable of extending into the impeller is convenient to weld, the integral structural strength of the impeller can be ensured, and the safety and reliability of the impeller are ensured.

According to the above-mentioned processing method, the processing device for processing the impeller, as shown in fig. 5 to 10, comprises a first fixer 7 and a second fixer 8, wherein the first fixer and the second fixer are both circular structures and are fixedly connected together through a connecting ring 9. And a clamping mechanism for clamping the front disc and the inlet ring is arranged on the first fixer. As shown in fig. 5, the clamping mechanism includes a screw 78 rotatably connected to the first fixture, a first handle 781 fixed to an outer wall of the screw, a screw nut 77 engaged with the screw and slidably connected to a screw nut groove of the first fixture, a plurality of connecting rods 771 fixed to the screw nut, and a pressing plate 772 fixedly connected to the connecting rods, wherein the number of the pressing plates is the same as that of the long blades, the screw has a cylindrical structure, and the outer wall of the screw is in threaded connection with the screw nut. The first fixer is provided with a plurality of sliding grooves 722, and the connecting rod is positioned in the sliding grooves and can move in the sliding grooves along with the screw nuts. Operation of the first handle drives rotation of the lead screw, which causes the lead screw nut, along with the pressure plate, to move axially along the first retainer. As shown in FIG. 9, after the pressure plate contacts the inner wall of the front plate, the front plate can be fixed with the inlet ring in a pressing way. At this time, the outer contact point of the front disc and the inlet ring may be welded. The pressing plate is provided with a straight groove, and after the pressing plate is tightly pressed with the front disc, the straight groove can be marked by marking, so that the front disc is equally divided into marks.

Positioning mechanisms are arranged in the first fixer and the second fixer, and the first fixer and the inner wall of the inlet ring and the second fixer and the inner wall of the shaft disc are fixed relatively through the positioning mechanisms. As shown in fig. 5 and 8, the positioning mechanism includes a spring plate 731 slidably connected to a spring groove 72 of the first fixer, a rod 73 fixed to the spring plate, a positioning block 74 fixed to one end of the rod outside the first fixer, a spring 733 disposed between an inner wall of the spring groove and the spring plate, a slide plate 732 fixed to the other end of the rod, a driving rod 76 fixed to the slide plate, an ear plate 753 fixed to the slide plate, a link rod 752 hinged to the ear plate, a hook 75 fixed to the link rod, a driving wheel 76 screwed to the first fixer, a second handle 791 fixed to the driving wheel, a driving block 793 fixed to an outer wall of the driving wheel and corresponding to the driving rod, a hanging plate 792 fixed to an outer wall of the driving wheel and corresponding to the hook, a limiting groove 721 provided in the first fixer, the driving rod, most of the link rod being disposed in the limiting groove, the driving rod 792, The other part of the connecting rod extends into a round hole at the outer side of the driving wheel. As shown in fig. 6, the number of the push rods 76 may be four or three. As shown in fig. 7, a groove 794 is formed in the hanging plate, and after the hook extends into the groove, the connecting rod can be pulled by the hanging plate to move towards one side close to the axis of the first fixer, so that the ejector rod moves towards one side close to the axis of the first fixer. When the driving wheel is rotated in the forward direction, the hanging plate is matched with the hook, and the connecting rod can be pulled to enable the positioning block to be close to the axis of the first fixer. When the driving wheel rotates reversely, the driving block can be in contact with the driving rod, and then the ejector rod is extruded, so that the ejector rod is far away from the axle center of the first fixer. A handle 71 is fixed to the axis of the first holder to facilitate the holding of the first holder. The driving wheel, the driving block, the driving rod, the hanging plate, the hook, the connecting rod, the sliding plate, the ejector rod, the spring plate and the spring form an adjusting unit, and the relative position between the positioning block and the first or second fixer is adjusted and limited under the action of the adjusting unit. Under the action of the spring, a certain distance is reserved between the positioning block and the first fixer.

The structure of the second fixer is the same as that of the first fixer, the second fixer is different from the first fixer in size, and the positioning block on the first fixer is used for contacting with the inner wall of the inlet ring to realize relative fixation with the inlet ring.

When the inlet ring and the front disc are welded, firstly, the positioning block is contacted with the inner wall of the inlet ring, so that the first fixer is relatively fixed with the inlet ring; then, the front disc and the inlet ring are placed and fixed, and finally the first handle is rotated, so that the screw rod rotates, and the screw rod nut moves towards one side close to the front disc until the pressing plate is contacted with the side wall of the front disc. And then, welding the front disc and the inlet ring, equally dividing and marking the front disc, welding the long and short blades and the rear disc, and finally welding the shaft disc and the rear disc. At this time, as shown in fig. 10, the positioning block on the first fixer is used to contact with the inner wall of the inlet ring, and the positioning block on the second fixer is used to fix with the inner wall of the hub, so as to realize the concentric arrangement between the hub and the inlet ring. At this time, it is necessary to ensure that the rear disc is in contact with the shaft disc, and then the contact points are welded and fixed.

The processing device is arranged, so that the relative fixation between the inlet ring and the front disc can be facilitated, the welding is further facilitated, and the welding processing precision is improved; the relative fixation between the rear disc and the shaft disc can be facilitated, and the integral machining precision is further facilitated. The number of the pressing plates is equal to that of the long blades, and the outer circle and the inner circle of the front disc can be equally divided when the pressing plates are internally scribed, so that the positions of the long blades and the short blades can be scribed conveniently.

Claims

1. The utility model provides a centrifugal fan welded impeller, it includes reel, import circle, blade, preceding dish and back plate, characterized by, the blade includes long blade and short blade, and long, short blade all sets up in the front between dish and the back plate and evenly set up on same circumference, and long blade sets up with short blade interval, is equipped with the picture peg at long, short blade lateral wall, is equipped with the first jack that corresponds with picture peg on the long blade on the back plate, still is equipped with the second jack that corresponds with picture peg on the short blade on the back plate.

2. A welded impeller for a centrifugal fan according to claim 1, wherein the first and second insertion holes have a width greater than the width of the insert plate.

3. The welded impeller of centrifugal fan as claimed in claim 1, wherein the outer wall of the hub has a protruding edge which contacts with the end surface of the back plate.

4. A welded impeller for a centrifugal fan according to claim 1 wherein the front disk is of conical configuration.

5. A welded impeller for a centrifugal fan according to claim 4, wherein the end face of the inlet ring is in contact with the small end face of the front disk.

6. A processing method for welding an impeller of a centrifugal fan is characterized by comprising the following steps:

7. A processing device for welding an impeller by a centrifugal fan is characterized by comprising a first fixer and a second fixer which are fixedly connected, wherein a plurality of positioning blocks are relatively and slidably arranged on the first fixer and the second fixer along the radial direction, and an adjusting unit for driving the positioning blocks to move and position is arranged between the positioning blocks and the first fixer or the second fixer; the periphery of the first fixer is provided with pressing plates with the same number as the long blades of the impeller, and a translation mechanism for driving the pressing plates to be close to or far away from the impeller is arranged between the pressing plates and the first fixer.

8. The processing device for the welding impeller of the centrifugal fan as claimed in claim 7, wherein the translation mechanism comprises a lead screw rotatably connected with the first fixer, a lead screw nut matched with the lead screw and slidably connected with the first fixer, and a plurality of connecting rods fixed on the lead screw nut, the connecting rods correspond to and are connected with the pressing plates one by one, and the pressing plates are provided with straight grooves.

9. The processing device of the centrifugal fan welded impeller according to claim 7, wherein the adjusting unit comprises a driving wheel in threaded connection with the first or second fixer, a plurality of driving blocks fixed on the outer wall of the driving wheel, a plurality of hanging plates fixed above the outer wall of the driving wheel, a push rod fixedly connected with the positioning block, a spring arranged between the first end of the push rod and the first fixer, a driving rod fixed on the second end of the push rod, a connecting rod hinged with the second end of the driving rod, and a hook fixed on the connecting rod, wherein a groove matched with the hook is arranged on the hanging plate.

10. The processing device for the welding impeller of the centrifugal fan as claimed in claim 9, wherein the positioning block is fixed at a first end of the ejector rod, a slide rod is fixed at a second end of the ejector rod, an ear plate and a driving rod are fixed on the slide rod, and the connecting rod is hinged to the ear plate.