CN212672105U - Wear-resistant structure of centrifugal impeller - Google Patents

Abstract

The utility model discloses an anti-abrasion structure of a centrifugal impeller, which comprises a plurality of blades which are uniformly distributed on a wheel disc along the circumference, wherein a wear-resistant lining plate which is tightly attached to the wheel disc is arranged at the inlet of each runner of the impeller, and the plurality of wear-resistant lining plates are spliced into an annular structure which can fully surround the welding line of the blade at the inlet of the runner and fully distribute the wear-resistant lining plates at the inlet of each runner of the impeller; the number of the blades is less than or equal to 12; wear-resistant base body layers are arranged on the pressure surface and the inlet end surface of the blade, and wear-resistant layers are arranged on the wear-resistant base body layers; the surfacing layers are arranged on the end face of the air inlet and the end face of the air outlet formed by the wear-resistant base body layer and the wear-resistant layer, the cross section of each surfacing layer is of a semi-elliptical structure, and the straight line of the short axis of the semi-elliptical structure is perpendicular to the blades. The wear-resistant lining plate in the utility model is fully surrounded at the inlet and the outlet near the wheel disc, thereby avoiding forming a local accelerating channel of airflow and prolonging the service life of the impeller; the service life of the original impeller can be prolonged to at least 2.5 years after optimization.

Description

Wear-resistant structure of centrifugal impeller

Technical Field

The utility model relates to a centrifugal impeller's abrasionproof decreases structure.

Background

In the industrial field, the process gas medium to be pressurized generally contains a certain amount of impurities. In addition, for the metallurgical industry, under normal conditions, the process gas medium to be pressurized contains more impurities, the main impurities are solid dust such as benzene, naphthalene, coke powder and the like, and meanwhile, some liquid impurities such as moisture, tar and the like exist, and typical media such as converter gas, coke oven gas, dry quenching circulating gas and the like are all the same, and particularly, the dry quenching circulating gas has high content of impurity dust (coke powder).

As the heart equipment of the technological process, the centrifugal fan improves the pressure energy and the speed energy of the gas through the impeller rotating at high speed, and the speed of the gas is reduced and diffused through the stator part, so that most of the speed energy of the gas is converted into the pressure energy, and the requirement of the normal operation of the technological process is met. During normal operation, the impeller is high-speed rotatory, if contain more solid dust and liquid impurity in the medium, can produce certain wearing and tearing at different positions to the impeller of high-speed rotation, in order to prevent impeller wearing and tearing, often design the wearing layer in the impeller runner, however, if the design of wearing layer is unreasonable, after operation time a period, can lead to impeller local wear serious, appear the blade even and worn out, finally lead to the incident. In engineering practice, such cases are common.

Disclosure of Invention

Not enough to prior art exists, the utility model aims to provide a centrifugal impeller's abrasionproof decreases structure to solve the impeller and contain the local wear problem and the unreasonable scheduling problem of current impeller wearing layer design under the operating mode that impurity such as dust is more than at the working medium.

In order to solve the technical problem, the utility model discloses a following technical scheme realizes:

an anti-abrasion structure of a centrifugal impeller comprises a plurality of blades which are uniformly distributed on a wheel disc along the circumference, an abrasion-resistant lining plate which is tightly attached to the wheel disc is arranged at the inlet of each runner of the impeller, and the abrasion-resistant lining plates are spliced into an annular structure which can fully surround the welding line of the blades at the inlet of the runner and fully distribute the abrasion-resistant lining plates at the inlet of each runner of the impeller; the number of the blades is less than or equal to 12;

wear-resistant base body layers are arranged on the pressure surface and the inlet end surface of the blade, and wear-resistant layers are arranged on the wear-resistant base body layers; the surfacing layers are arranged on the end face of the air inlet and the end face of the air outlet formed by the wear-resistant base body layer and the wear-resistant layer, the cross section of each surfacing layer is of a semi-elliptical structure, and the straight line of the short axis of the semi-elliptical structure is perpendicular to the blades.

The utility model discloses still include following technical characteristic:

specifically, the end faces of the wear-resistant base body layer and the wear-resistant layer are flush; the weld overlay includes: welding a first common welding rod overlaying layer with a semi-elliptical shape on the end face of the wear-resistant base body layer; and the first abrasion-resistant welding rod overlaying layer is covered on the first common welding rod overlaying layer, the appearance of the first abrasion-resistant welding rod overlaying layer is of an oval structure, and the first abrasion-resistant welding rod overlaying layer covers the end face of the abrasion-resistant layer and part of the side face of the abrasion-resistant layer.

Specifically, the end face of the wear-resistant base body layer protrudes and is thinned into a trapezoidal end face; the weld overlay includes: welding a second common welding rod overlaying layer with the shape of a semi-elliptical structure on the trapezoidal end face of the wear-resistant base body layer; and a second wear-resistant welding rod overlaying layer which is covered on the second common welding rod overlaying layer and has an oval structure in shape, wherein the second wear-resistant welding rod overlaying layer covers the end face of the wear-resistant layer and part of the side face of the wear-resistant layer.

Specifically, the end face of the wear-resistant base body layer protrudes and is thinned into a trapezoidal end face; the weld overlay includes: welding a third common welding rod overlaying layer of which the appearance of the trapezoidal end face of the wear-resistant base body layer is of a semi-elliptical structure; and a third wear-resistant welding rod overlaying layer which is covered on the second common welding rod overlaying layer and has a semi-elliptical structure in shape, wherein the third wear-resistant welding rod overlaying layer covers the end face of the wear-resistant layer but does not cover the side face of the wear-resistant layer so as to be smoothly connected with the wear-resistant layer.

Specifically, the end face of the wear-resistant base body layer protrudes and is thinned into a tip end face; the weld overlay includes: the appearance of welding at wear-resisting base member layer tip terminal surface is the fourth wear-resisting welding rod surfacing layer of semiellipse structure, and this fourth wear-resisting welding rod surfacing layer covers the wearing layer terminal surface and does not cover the wearing layer side in order to be connected with the wearing layer is smooth.

The utility model discloses has following technological effect:

the wear-resistant lining plate in the utility model is completely surrounded at the inlet and the outlet near the wheel disc (central disc), thereby avoiding forming a local accelerating channel of airflow and prolonging the service life of the impeller; from the effect of product application, only the original impeller is optimized, the original impeller is used for 6-8 months, and the service life can be prolonged to at least 2.5 years after optimization.

The utility model discloses still optimize the blade number, reduced import air speed, improved the through-flow capacity at blade import position, improved the pneumatic performance of impeller, extension impeller life.

The utility model provides a wear-resisting design is imported and exported to the blade adopts two-layer build-up welding structure, and the one deck is ordinary build-up welding structure, has guaranteed the hookup reliability of blade, wear-resisting welt, and another layer is wear-resisting layer, has effectively protected the ordinary welding of inlayer, has guaranteed the wearability at blade import and export position.

The utility model discloses optimize blade inlet structure, reduce import impact loss and the velocity of air flow, prolong the impeller life, improve fan efficiency.

Through the measures, the new impeller can be used for more than 3 years, and the operation efficiency can be improved by more than 2% according to the service life of 3 years, calculated by 2%. For a dry quenching fan used in a 190 ten thousand ton dry quenching device, one set of rotor is 80 ten thousand yuan, the electric charge is calculated according to 0.5 yuan, the annual running time is calculated according to 8000h, the rotor charge can be saved by more than 280-400 ten thousand yuan and the electric charge can be saved by 70 ten thousand yuan compared with the original scheme in 3 years, and the total calculation time is more than 350-400 ten thousand yuan.

Drawings

Fig. 1(a) is a structure diagram of an existing impeller inlet/outlet wear prevention structure; (b) is a cross-sectional view taken along line A-A of FIG. (a); (c) the structure diagram of the surfacing of the end surfaces of the inlet and the outlet of the blade in the prior art is shown;

fig. 2(a) is a structural diagram of the impeller wear prevention structure of the present invention; (b) is a cross-sectional view taken along line A-A of FIG. (a);

fig. 3 is a structure view of a build-up welding of the inlet and outlet end faces of the blade in embodiment 1 of the present invention;

fig. 4 is a structure view of a build-up welding of the inlet and outlet end faces of the blade in embodiment 2 of the present invention;

fig. 5 is a structure view of a build-up welding of the inlet and outlet end faces of the blade in embodiment 3 of the present invention;

fig. 6 is a structure view of a build-up welding of the inlet and outlet end faces of the blade in embodiment 4 of the present invention;

the meaning of the individual reference symbols in the figures is:

1-wheel disc, 2-blade, 3-wear liner, 4-wear base layer, 5-wear layer, 6-surfacing layer, 61-first common welding rod surfacing layer, 62-first wear-resistant welding rod surfacing layer, 63-second common welding rod surfacing layer, 64-second wear-resistant welding rod surfacing layer, 65-third common welding rod surfacing layer, 66-third wear-resistant welding rod surfacing layer and 67-fourth wear-resistant welding rod surfacing layer.

Detailed Description

In the prior art, as shown in fig. 1, fig. 1(a) is a detailed partial cross-sectional view of an impeller with blades, and fig. 1(b) is a radial flow channel diagram of the impeller as a right side view of the impeller. Has the following technical characteristics: the local wrap angle of the part of the wear-resistant lining plate 100 close to the wheel disc (central disc) at the inlet is reduced suddenly, and the flow area of the flow channel at the wrap angle part of the inlet of the adjacent blade 200 is reduced suddenly, so that a suddenly accelerated air flow channel is formed; the number of the blades is determined according to a modeling design method, and is generally about 16-22. In the anti-wear design of the inlet and outlet of the blade 200 in the prior art, as shown in fig. 2, the inlet and outlet of the blade are commonly welded to form a circular common electrode overlaying layer 300, and a layer of wear-resistant electrode overlaying layer 400 with basically equal thickness is overlaid on the outer layer of the blade, so that the cross section of the blade is circular along the width direction of the blade.

Because impeller wear-resisting welt 100 is close to the local cornerite of rim plate (center) position at the import, the runner reduces suddenly at adjacent blade import cornerite position flow area, an air current passageway of sudden acceleration has been formed, here for other import positions, the velocity of flow is very different, and have certain guide effect to the air current, often can lead the air current to the suction surface of dish side blade, because the dust content in the medium is great, the loss that has caused this position is serious, the wearing and tearing of dish side blade suction surface have been aggravated simultaneously. In a certain case, after the fan runs for about 4-6 months, the suction surface of the side blade of the disc is found to have a serious abrasion groove during maintenance. The number of the blades is selected according to a modeling design method, generally about 16-22 blades, and due to the design of the wear-resistant lining plate, the inlet blocking coefficient of the impeller is increased, the pneumatic performance of the impeller is influenced, the flow speed of airflow at the inlet of the blades of the impeller is accelerated, and the abrasion of the impeller is aggravated.

The specific reasons for the decrease in aerodynamic performance of the impeller and the increase in wear of the impeller are briefly described below. The design of the current fan generally adopts a modeling design method, the design method needs a high-efficiency and reliable model level series, in the model level design, in order to reduce the inlet airflow impact loss, the inlet of the blade is thinned or the thickness of the original blade is kept unchanged, however, for the fan needing an anti-wear occasion, a wear-resistant layer needs to be built up on the inlet and the outlet of the impeller blade, and the wear-resistant layer needs to have a certain thickness, so that the through flow area of the inlet of the impeller blade is reduced or the blocking coefficient is increased, the performance of the fan cannot reach the designed performance, the fan is not matched with the process, and the use requirement of a user is not met; in addition, the original blade inlet surfacing welding shape is circular, so that the intake impact loss is large, and the blade outlet surfacing welding layer can increase the trail loss, influence the pneumatic performance of the whole impeller and cause the lower efficiency of the impeller. The flow velocity of the air flow is accelerated by the reduction of the flow area of the impeller inlet, and it is known that the wear is positively correlated with the square of the flow velocity of the air flow, thus causing further increase in wear.

Therefore, the utility model provides an anti-abrasion structure of a centrifugal impeller, which is used for solving the problem of local abrasion of the impeller under the working condition that the working medium contains more impurities such as dust and the like, and prolonging the service life of the impeller; and further optimize impeller structural parameter, improve fan performance, satisfy the operation requirement.

The following embodiments of the present invention are given, and it should be noted that the present invention is not limited to the following embodiments, and all the equivalent transformations made on the basis of the technical solution of the present application all fall into the protection scope of the present invention.

Example 1:

as shown in fig. 2 and fig. 3, the embodiment provides an anti-abrasion structure of a centrifugal impeller, which includes a plurality of blades 2 uniformly distributed on a wheel disc 1 along the circumference, a wear-resistant lining plate 3 tightly attached to the wheel disc 1 is arranged at the inlet of each flow channel of the impeller, and the plurality of wear-resistant lining plates 3 are spliced into an annular structure to fully surround the weld joints of the blades 2 at the inlet of the flow channel and fully distribute the wear-resistant lining plates 3 at the inlet of each flow channel of the impeller; a complete protective layer is formed on the whole circumference, so that the flow field is uniformly distributed and the flow velocity is stable; the wear-resistant lining plate 3 is completely surrounded at the inlet and the outlet close to the wheel disc (the middle disc), so that a local air flow acceleration channel is prevented from being formed, and the service life of the impeller is prolonged; from the effect of product application, only the original impeller is optimized, the original impeller is used for 6-8 months, and the service life can be prolonged to at least 2.5 years after optimization. In the embodiment, the number of the blades 2 is less than or equal to 12, so that the airflow speed at the inlet is reduced, the through-flow capacity of the inlet part of each blade is improved, the pneumatic performance of the impeller is improved, and the service life of the impeller is prolonged. The pressure surface of the blade 2 and the inlet end surface of the blade 2 are provided with wear-resistant base body layers 4, and the wear-resistant base body layers 4 are provided with wear-resistant layers 5; all be equipped with build-up welding layer 6 on the air intake terminal surface that wear-resisting base member layer 4 and wear-resisting layer 5 formed and the air outlet terminal surface, 6 cross-sectional appearances of build-up welding layer are half oval structure, and the minor axis place straight line of this half oval structure is perpendicular with blade 2.

In the embodiment, the end faces of the wear-resistant base body layer 4 and the wear-resistant layer 5 are flush; the build-up layer 6 includes: a first common welding rod overlaying layer 61 welded on the end face of the wear-resistant base body layer 4, wherein the appearance of the first common welding rod overlaying layer is of a semi-elliptical structure; and a first hardfacing electrode overlaying layer 62 with an elliptical shape covering the first common electrode overlaying layer 61, wherein the first hardfacing electrode overlaying layer 62 covers the end surface of the wear-resistant layer 5 and part of the side surface of the wear-resistant layer 5. More specifically, the impeller blade inlet and outlet wear-resistant design of the present embodiment adopts a two-layer surfacing structure, the first common welding rod surfacing layer 61 on the inner layer is designed into a thinning processing structure with a shape close to an elliptical shape along the cross section in the blade width direction, the first wear-resistant welding rod surfacing layer 62 on the outer layer is basically of the same thickness, and the thinning structure of the whole blade inlet is adopted.

Example 2:

as shown in fig. 2 and 4, this embodiment provides a wear-resistant structure of a centrifugal impeller, which is different from embodiment 1 in that the end face of the wear-resistant base layer 4 is protruded and thinned into a trapezoidal end face; the build-up layer 6 includes: a second common welding rod overlaying layer 63 welded on the trapezoidal end face of the wear-resistant base body layer 4, wherein the appearance of the second common welding rod overlaying layer is of a semi-elliptical structure; and a second hardfacing electrode overlaying layer 64 with an elliptical shape covering the second common electrode overlaying layer 63, wherein the second hardfacing electrode overlaying layer 64 covers the end surface of the wear-resistant layer 5 and part of the side surface of the wear-resistant layer 5. Specifically, the end face of the wear-resistant base layer 4 is thinned along a certain length range of the blade, and a part of the wear-resistant layer 5 is removed along the flow direction of the blade, so that a distance required by thinning of the blade is reserved; the impeller blade inlet and outlet anti-wear design adopts a two-layer surfacing structure, a second common welding rod surfacing layer 63 on the inner layer is welded with a layer in the width direction along the shape of the thinned blade, the surface is subjected to smooth transition treatment, the cross section of the second common welding rod surfacing layer is basically close to an oval-shaped thinning treatment structure, a second wear-resistant welding rod surfacing layer 64 with basically equal thickness on the outer layer and a thinning structure of the whole blade inlet are adopted; the second hardfacing electrode weld overlay 64 is spaced laterally from the original hardfacing 5.

Example 3:

as shown in fig. 2 and 5, the present embodiment provides an anti-wear structure of a centrifugal impeller, and is different from embodiment 1 in that the end face of the wear-resistant base layer 4 protrudes and is thinned into a trapezoidal end face; the build-up layer 6 includes: a third common welding rod overlaying layer 65 welded on the trapezoidal end face of the wear-resistant base body layer 4, wherein the appearance of the third common welding rod overlaying layer is of a semi-elliptical structure; and a third hardfacing electrode overlaying layer 66 with a semi-elliptical configuration overlying the third common electrode overlaying layer 65, and the third hardfacing electrode overlaying layer 66 covers the end face of the wear-resistant layer 5 without covering the side face of the wear-resistant layer 5 to be smoothly connected with the wear-resistant layer 5. Specifically, the end face of the wear-resistant base body layer 4 is thinned along a certain length range of the blade, and a part of the wear-resistant lining plate wear-resistant layer is removed along the flow direction of the blade, so that a distance required by thinning the blade is reserved; the impeller blade inlet and outlet anti-wear design adopts a two-layer surfacing structure, a third common welding rod surfacing layer 65 on the inner layer is welded with a layer along the width direction of the thinned blade shape, the surface is subjected to smooth transition treatment, the cross section is basically close to an elliptical thinning treatment structure, a third wear-resistant welding rod surfacing layer 66 on the outer layer is basically equal in thickness, and the integral blade inlet is of a thinning structure. The end face of the original wear-resistant layer 5 is in smooth transition connection with the wear-resistant welding layer, and the surfacing welding layer 66 of the third wear-resistant welding rod is not surfacing-welded on the side face of the wear-resistant layer 5.

Example 4:

as shown in fig. 2 and fig. 6, this embodiment provides a wear-resistant structure of a centrifugal impeller, and differs from embodiment 1 in that the end face of the wear-resistant base layer 4 protrudes and is thinned to a tip end face; the build-up layer 6 includes: the appearance of welding at wear-resisting base member layer 4 tip terminal surface is the fourth hardfacing electrode surfacing layer 67 of half oval structure, and this fourth hardfacing electrode surfacing layer 67 covers 5 terminal surfaces of wearing layer and does not cover 5 sides of wearing layer in order to be connected with 5 smooth of wearing layer. Specifically, the end face of the wear-resistant base body layer 4 is thinned along a certain length range of the blade, and a part of the wear-resistant lining plate wear-resistant layer is removed along the flow direction of the blade, so that a distance required by thinning the blade is reserved; the impeller blade inlet and outlet are designed to be anti-abrasion, only the fourth abrasion-resistant welding rod surfacing layer 67 is surfaced on the end surface, and the integral blade inlet is of a thinning structure. The end face of the original wear-resistant layer 5 is in smooth transition connection with the fourth wear-resistant welding electrode overlaying layer 67, and the fourth wear-resistant welding electrode overlaying layer 67 is not overlaid on the side face of the wear-resistant layer 5.

The utility model discloses through product operation verification, the result is good, compares with former scheme, and the life extension of impeller is more than 3 times, and unit operating stability, operating efficiency have also obtained the improvement.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.

In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.

Claims (5)

1. An anti-abrasion structure of a centrifugal impeller comprises a plurality of blades (2) which are uniformly distributed on a wheel disc (1) along the circumference, and is characterized in that an abrasion-resistant lining plate (3) which is tightly attached to the wheel disc (1) is arranged at the inlet of each runner of the impeller, the abrasion-resistant lining plates (3) are spliced into an annular structure, the welding seams of the blades (2) at the inlet of the runners can be completely surrounded, and the inlet of each runner of the impeller is fully distributed with the abrasion-resistant lining plate (3);

the number of the blades (2) is less than or equal to 12;

a wear-resistant base body layer (4) is arranged on the pressure surface of the blade (2) and the inlet end surface of the blade (2), and a wear-resistant layer (5) is arranged on the wear-resistant base body layer (4); all be equipped with build-up welding layer (6) on the air intake terminal surface and the air outlet terminal surface that wear-resisting base member layer (4) and wearing layer (5) formed, build-up welding layer (6) cross-sectional profile is half oval structure, and the minor axis place straight line of this half oval structure is perpendicular with blade (2).

2. A centrifugal impeller wear prevention structure according to claim 1, characterized in that the wear resistant base layer (4) and the wear resistant layer (5) are flush with each other in end face; the weld overlay (6) comprises: a first common welding rod overlaying layer (61) which is welded on the end face of the wear-resistant base body layer (4) and has a semi-elliptical shape; and a first wear-resistant welding rod overlaying layer (62) which is covered on the first common welding rod overlaying layer (61) and has an oval shape, wherein the first wear-resistant welding rod overlaying layer (62) covers the end face of the wear-resistant layer (5) and part of the side face of the wear-resistant layer (5).

3. A wear prevention structure of a centrifugal impeller according to claim 1, wherein the end face of the wear resistant base layer (4) is protruded and thinned to a trapezoidal end face; the weld overlay (6) comprises: a second common welding rod overlaying layer (63) welded on the trapezoidal end face of the wear-resistant base body layer (4) and having a semi-elliptical shape; and a second wear-resistant welding rod overlaying layer (64) which is covered on the second common welding rod overlaying layer (63) and has an oval shape, wherein the second wear-resistant welding rod overlaying layer (64) covers the end face of the wear-resistant layer (5) and part of the side face of the wear-resistant layer (5).

4. A wear prevention structure of a centrifugal impeller according to claim 1, wherein the end face of the wear resistant base layer (4) is protruded and thinned to a trapezoidal end face; the weld overlay (6) comprises: a third common welding rod overlaying layer (65) welded on the trapezoidal end face of the wear-resistant base body layer (4) and having a semi-elliptical shape; and a third wear-resistant welding rod overlaying layer (66) which is covered on the third common welding rod overlaying layer (65) and has a semi-elliptical shape, wherein the third wear-resistant welding rod overlaying layer (66) covers the end face of the wear-resistant layer (5) but does not cover the side face of the wear-resistant layer (5) so as to be smoothly connected with the wear-resistant layer (5).

5. A centrifugal impeller wear prevention structure according to claim 1, wherein the end face of the wear resistant base layer (4) is protruded and thinned to a tip end face; the weld overlay (6) comprises: the appearance of welding at wear-resisting base member layer (4) tip terminal surface is fourth wear-resisting welding rod surfacing layer (67) of semiellipse structure, and this fourth wear-resisting welding rod surfacing layer (67) covers wearing layer (5) terminal surface and does not cover wearing layer (5) side in order to be connected with wearing layer (5) smoothness.

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