KR20200062486A - Wear ring assembly of impeller for nlg pump - Google Patents

Abstract

The present invention relates to a wear ring assembly of an impeller for an LNG pump which includes a wear ring which is made of the same material as the impeller fixed by cooling-coupling to the outer circumferential surface of the impeller installed for a liquid cargo loading and discharging pump of an LNG tank. The wear ring assembly of an impeller for an LNG pump increases maintenance efficiency, durability and service life by slowing down the degree of wear at a part where wear due to friction occurs during high-speed rotation of the impeller of the LNG loading and discharging pump.

Description

Wear ring assembly of the impeller for the LNＧ pump {WEAR RING ASSEMBLY OF IMPELLER FOR NLG PUMP}

The present invention relates to a wear ring assembly of an impeller for an LNG pump, and more particularly, to an abrasion ring assembly of an impeller for an LNG pump used for loading and unloading and impeller of LNG.

The impeller part of a general pump including "Pump capable of monitoring bearing wear" (hereinafter referred to as prior art) of Patent No. 10-1765205 is a part in which high-speed rotation is performed, and the friction part of the rotating part has a lower hardness than the rotating part. Consists of a set ring or the like is provided with a wear ring that is fixed detachably.

The wear ring is fixed to the impeller for high-speed rotation, which functions as an important part of the pump, and is provided with a wear ring for each of the diffusers to reduce wear of the friction parts of the main parts of the impeller and the diffuser.

In other words, the wear ring is a part provided to help maintain the durability of the entire device and increase the service life, while being sacrificed in the manner of being worn out and replaced with a new one before the rotating parts described above.

As described above, the existing wear ring is made of a material having a hardness lower than that of the impeller and other materials, for example, to be fixed with a set screw, and in the field, if the wear ring is replaced three or more times, the impeller itself Is to replace it.

However, in the process of loosening the set screw and mounting a new wear ring, frequent machining for maintaining the balance is additionally performed in the process of fastening the set screw again, causing a contradictory problem of shortening the life of the impeller.

In addition, this set screw fixing type wear ring has a problem of unnecessary waste of material because both the impeller and the diffuser need to replace the wear ring.

Registered Patent No. 10-1765205

The present invention was invented to improve the problems as described above, and it is possible to increase maintenance efficiency, durability, and service life by slowing down the degree of wear at a portion where friction occurs due to friction during high-speed rotation of the loading and discharging pump impeller of LNG. It is to provide a wear ring assembly of the impeller for the LNG pump to enable.

In order to achieve the above object, the present invention is a stepped seat formed on the outer circumferential surface of the rotating body of the impeller provided in the liquid cargo loading and unloading pump of the LNG tank; And an inner diameter smaller than or equal to the outer diameter of the seating stepped jaw, including a wear preventing part secured to the seating stepped, wherein the wear preventing part is fitted into the seating stepped and the outer circumferential surface of the rotating body by cooling fit. It will be able to provide a wear ring assembly of the impeller for the LNG pump.

Here, the wear prevention portion is characterized in that it is made of the same material as the impeller.

At this time, the material is characterized in that the aluminum or aluminum alloy.

In addition, the length (hereinafter, the first length) from the inner circumferential end of the wear-resistant portion, which is a ring shape through which both ends are penetrated, to the other end, is greater than the length (hereinafter, the second length) from the seating end to the end of the rotating body. Or the same, the imaginary line passing through the first length is characterized in that it is parallel to the imaginary line penetrating the center of the wear protection.

In addition, the wear-prevention portion includes a ring-shaped wear ring, and the wear ring is made of the same material as the impeller.

In addition, the thickness, which is the distance from the inner edge to the outer edge of the wear preventing portion, is characterized in that the upper surface of the seating step is greater than or equal to the length protruding radially outward from the outer peripheral surface of the rotating body.

In addition, it is characterized in that it further comprises a wear check means formed on the outer circumferential surface of the wear preventing part to check the degree of wear or detectable.

In addition, the wear confirmation means is characterized in that it comprises a wear confirmation rib that is protruded in a ring shape along the outer circumferential surface of the wear prevention portion and spaced in parallel in a plurality toward the seating step.

And, the wear confirmation means, among the plurality of wear confirmation ribs, each of the wear check ribs disposed inside each of the outermost wear check ribs disposed at one end side and the other end side of the outer circumferential surface of the wear prevention unit is constant. It characterized in that it further comprises an incision that is formed incision for each distance.

In addition, it is characterized in that it further comprises a release preventing pin that is fixed to the seating step and fixed to the inner periphery of the abrasion prevention part fitted to the rotating body and the outer peripheral surface of the rotating body.

In addition, the departure-prevention pin is characterized in that it is made of a material having a hardness equal to or greater than that of the wear-resistant portion and the rotating body.

In addition, a fixed welding line formed by laser welding along the outer edge of the rotating body and the inner edge of the wear preventing part, and wear formed by performing a film treatment by hard anodizing on the outer surfaces of the wear preventing part and the impeller as a whole. It characterized in that it further comprises a protective layer.

Meanwhile, the present invention provides a wear ring assembly of an impeller for an LNG pump, characterized in that it comprises a wear ring of the same material as the impeller fixed to the outer circumferential surface of the impeller provided for the liquid cargo loading and discharging pump of the LNG tank. You may be able to provide

According to the present invention having the above configuration, the following effects can be achieved.

First, the present invention is a stepped seat formed on the outer circumferential surface of the rotating body of the impeller provided in the liquid pump loading and discharging pump of the LNG tank; And an inner diameter smaller than or equal to the outer diameter of the seating step, and includes a wear preventing part secured to the seating step, and the wear preventing part is fitted into the seating step and the outer circumferential surface of the rotating body by cooling fit, but the wear preventing part is made of impeller and aluminum or By being made of the same material as the aluminum alloy, it will be possible to increase the convenience of maintenance by increasing the life of the abrasion prevention unit, increase the maintenance efficiency, and reduce the number of labors, thereby reducing maintenance costs.

In particular, the present invention is to be able to achieve the effect of extending the life of the impeller because there is no damage to the base material due to replacement of the wear ring, that is, there is no damage to the rotating body of the impeller.

According to the present invention, since only the wear ring on the diffuser side needs to be replaced in some cases, maintenance efficiency and maintenance cost can be reduced. This is because only the diffuser side with frequent replacement frequency replaces the wear ring on the impeller side. It is useful to reduce the amount of replacement of parts, thereby reducing unnecessary waste of raw materials.

In addition, the present invention increases the wear resistance by subjecting the fixed welding line formed by laser welding along the outer edge of the rotating body and the inner edge of the abrasion prevention portion to the outer surface of the entire abrasion prevention portion and the impeller by hard anodizing. It is of course possible to increase the durability by using an anti-wear part with the same material as the impeller.

And, according to the present invention, the length (hereinafter, the first length) from the inner circumferential end to the other end of the inner circumferential surface of the wear-resistant portion having the ring shape through which both ends are penetrated is the length from the seating end to the end of the rotating body (hereinafter referred to as the second length). Greater than or equal, the virtual line passing through the first length is parallel to the virtual line penetrating through the center of the abrasion prevention part, minimizing hassle and difficult work due to the balance maintenance of the impeller, which is a high-speed rotating part due to installation of the abrasion prevention part. It has the advantage of being able to do it.

And, the abrasion prevention part according to the present invention includes a ring-shaped wear ring, and the wear ring is made of the same material as the impeller, thereby increasing durability of the entire device and increasing the replacement cycle to greatly improve convenience in maintenance and repair. Will be able to increase.

And, according to the present invention, the thickness, which is the distance from the inner edge to the outer edge of the abrasion prevention portion, is such that the upper surface of the seating step is formed to be greater than or equal to the length protruding radially outward from the outer peripheral surface of the rotating body, thereby forming the friction portion It has the advantage of being able to perform the intrinsic function of the wear ring according to it, but also to prevent leakage of lubricants and contaminants.

In addition, according to the present invention, it is formed on the outer circumferential surface of the wear prevention unit, or by further comprising a detectable wear detection means, it is possible to assist in grasping the correct replacement time according to the wear level, and It is possible to provide a product with high safety and reliability by preventing malfunction and failure from occurring.

In addition, the wear confirmation means according to the present invention includes a wear confirmation rib that is protrudingly formed in a ring shape along the outer circumferential surface of the wear preventing portion and spaced in parallel toward a plurality of seating steps, thereby forming a labyrinth seal formed in an existing wear ring. You will be able to perform your role smoothly.

And, the wear check means according to the present invention, among the plurality of wear check ribs, each of the wear check ribs disposed inside each of the outermost wear check ribs disposed at one end side and the other end side of the outer circumferential surface of the wear prevention unit, respectively By further providing incisions that are incised at regular distances, it will be possible to achieve an additional effect of slowing the wear rate by allowing the internal distribution of lubricant in the labyrinth seal described above.

In addition, according to the present invention, the wear prevention portion for the rotating body by further comprising a separation prevention pin that is fixed to the seating step and fixed to the rotating body to be fitted into the rotating body, and an impact pin fixed between the outer circumferential surface of the rotating body. It will help to maintain a firm and solid fixation.

In addition, the anti-separation pin according to the present invention is made of a material having a hardness equal to or greater than that of the abrasion prevention part and the rotating body, so that durability and strength of the entire device can be maintained, as well as maintaining a firm and sturdy fixed state for a long time. It will be possible across.

Figure 1 shows the overall structure of the wear ring assembly of the impeller for an LNG pump according to an embodiment of the present invention, Figure 1 (a) is a main portion of the present invention showing a state for abrasion preventing portion is mounted on the rotating body It is an exploded partial cross-sectional conceptual diagram, and FIG. 1(b) is a plan conceptual diagram.
FIG. 2 is an enlarged view of a portion II of FIG. 1, and partially cross-sections sequentially showing a process of mounting a wear preventing part, which is a main part of a wear ring assembly of an impeller for an LNG pump, according to an embodiment of the present invention to a rotating body. Conceptual diagram
FIG. 3 is an enlarged view of part III of FIG. 1, and partially enlarges the structure of the wear check means provided in the wear preventing part which is a main part of the wear ring assembly of the impeller for an LNG pump according to various embodiments of the present invention. Side conceptual diagram
Figure 4 is an exploded cross-sectional conceptual view showing the overall structure of the wear ring assembly of the impeller for an LNG pump according to another embodiment of the present invention
Figure 5 is a plan view showing the overall structure of the wear ring assembly of the impeller for an LNG pump according to another embodiment of the present invention

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms.

In the present specification, this embodiment is provided to make the disclosure of the present invention complete, and to fully inform the scope of the invention to those skilled in the art to which the present invention pertains.

And the present invention is only defined by the scope of the claims.

Thus, in some embodiments, well-known components, well-known operations, and well-known techniques are not specifically described in order to avoid obscuring the present invention.

In addition, the same reference numerals throughout the specification refer to the same components, and the terms used (referred to) in this specification are for describing the embodiments and are not intended to limit the present invention.

In the present specification, the singular form also includes the plural form unless specifically stated in the phrase, and the components and operations referred to as'comprising (or, provided)' do not exclude the presence or addition of one or more other components and operations. .

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings commonly understood by those skilled in the art to which the present invention pertains.

Also, terms that are defined in a commonly used dictionary are not ideally or excessively interpreted unless they are defined.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

For reference, Figure 1 shows the overall structure of the wear ring assembly of the impeller for an LNG pump according to an embodiment of the present invention, Figure 1 (a) is a main part of the present invention wear prevention unit 20 is a rotating body ( It is an exploded partial cross-sectional conceptual view showing a state for mounting on 10), and FIG. 1(b) is a conceptual plan view.

In addition, FIG. 2 is an enlarged view of a portion II of FIG. 1, and the main body of the wear ring assembly of the impeller for an LNG pump according to an embodiment of the present invention is equipped with an anti-wear part 20 mounted on a rotating body 10 It is a partial cross-sectional conceptual diagram sequentially showing the process of doing.

In addition, FIG. 3 is an enlarged view of a portion III of FIG. 1, and the wear confirmation means 30 provided in the wear prevention part 20 which is a main part of the wear ring assembly of the impeller for an LNG pump according to various embodiments of the present invention ) Is a conceptual diagram of a partially enlarged side showing the structure.

In addition, Figure 4 is an exploded cross-sectional conceptual view showing the overall structure of the wear ring assembly of the impeller for an LNG pump according to another embodiment of the present invention.

In addition, Figure 5 is a plan view showing the overall structure of the wear ring assembly of the impeller for an LNG pump according to another embodiment of the present invention.

The present invention can be seen that the structure including a wear ring of the same material as the impeller 10 fixed to the outer periphery of the impeller 10 provided in the liquid pump loading and discharging pump of the LNG tank as shown in the cooling circumference.

First, the seating step 12 is formed to be stepped on the outer circumferential surface of the rotating body 11 of the impeller 10 provided for the liquid cargo loading and discharging pump of the LNG tank, and the seating of the abrasion prevention part 20 to be described later It was prepared to provide area and space.

In addition, the wear preventing unit 20 has an inner diameter smaller than or equal to the outer diameter of the seating stepped 12, and is fixed to the seating stepped 12, and is intended to perform the same function as a conventional wear ring.

Here, the abrasion prevention unit 20 is to be fitted into the seating stepped 12 and the outer peripheral surfaces of the rotating body 11 by cooling and fitting.

The present invention can be applied to the above-described embodiments, it is of course also possible to apply the following various embodiments.

First, the abrasion prevention portion 20 is to be made of the same material as the impeller 10, but the above-described material may adopt one such as aluminum or aluminum alloy.

On the other hand, the length from the inner circumferential end of the wear-resistant portion 20, which has both rings pierced at both ends, to the other circumferential end (refer to the first length (d1) and hereinafter FIG. 2(a)), is from the seating step 12. The length to the end of the rotating body 11 is greater than or equal to the length (hereinafter referred to as the second length (d2) and FIG. 2(a)), and the virtual line passing through the first length (d1) is abrasion prevention unit 20 It can be grasped that it is parallel to the virtual line (CL, see FIG. 1 below) passing through the center of the.

In addition, the wear preventing portion 20 includes a ring-shaped wear ring 20, and the wear ring 20 is made of the same material as the impeller 10, as described above.

On the other hand, the thickness (t1), which is the distance from the inner edge to the outer edge of the wear protection part 20, is the length (t2) of the upper surface of the seating stepped (12) protruding radially outward from the outer circumferential surface of the rotating body (11). Make it larger or equal.

In addition, the present invention may be provided on the outer circumferential surface of the wear preventing portion 20 as shown in Figure 3 to further include a wear confirmation means 30 to check or detect the degree of wear.

Here, the wear confirmation means 30 is formed in a ring shape protruding along the outer circumferential surface of the wear prevention unit 20, and wear confirmation ribs 31i, 31m, 31f spaced in parallel in plural toward the seating stepped 12 It can be grasped that it includes.

At this time, the sensor to detect the degree of wear on the part where the rotating body 11 of the impeller 10 is mounted by visually checking the degree of wear of both edges of the plurality of wear confirmation ribs 31i, 31m, 31f By mounting (not shown), it will be possible for the aforementioned sensor to grasp the degree of wear in real time and notify the management center or the manager's terminal of wear and replacement.

These plurality of wear confirmation ribs (31i, 31m, 31f) act as a kind of labyrinth seal, while dropping the flow and pressure of the fluid to prevent contaminants from passing over the bearing, thereby protecting the bearing (Bearing Protection) The lubricant on the bearing side will function to prevent leakage.

In addition, the wear confirmation means 30, a plurality of wear confirmation ribs (31i, 31m, 31f) of the outer circumferential surface of the wear protection unit 20, one end side and the other end of the outermost wear confirmation ribs disposed on each side , 31f) It is also possible to further include an incision 32 formed in an incision every predetermined distance in each of the wear confirmation ribs 31m disposed inside each.

Here, the incision 32 is provided to allow the distribution of lubricant, thereby slowing the wear rate of the abrasion prevention unit 20 due to friction.

The wear check means 30 allows the outermost wear check ribs 31i, 31m, 31f, that is, the wear check ribs 31i, 31m, 31f disposed on the outermost side to be manufactured in a ring shape, thereby leaking contaminants. And discharge will function to disallow.

At this time, the wear confirmation means 30, if necessary, as shown in Fig. 2(b), the wear confirmation ribs 31m having the above-described cutouts 32 formed between the ring-shaped wear confirmation ribs 31m are alternately arranged. You may.

On the other hand, the present invention is fixed between the inner circumferential surface of the wear-resistant portion 20 and the outer circumferential surface of the rotating body 11, which is seated and fixed to the seating step 12 and fitted to the rotating body 11 as shown in FIGS. 4 and 5. It may be further provided with a separating prevention pin 40 to be fixed.

Here, the anti-separation pin 40 is made of a material having a hardness equal to or greater than that of the wear preventing portion 20 and the rotating body 11.

Hereinafter, the working process of the wear ring assembly of the impeller for an LNG pump according to a preferred embodiment of the present invention will be briefly described as follows.

First, the operator fits and secures the abrasion prevention part 20 on the rotating body 11 in a cooling and fastening manner, and is seated and fixed on the seating step 12.

Thereafter, the operator performs laser welding along the outer edge of the rotating body 11 and the inner edge of the abrasion prevention part 20 to form a fixed welding line 50 (see FIG. 2(c)).

Next, the operator will be able to form a wear protection layer (not shown) by performing a film treatment by hard anodizing on the outer surfaces of the entire wear protection unit 20 and the impeller 10.

Hereinafter, the operation and effects of the wear ring assembly of the impeller for an LNG pump according to a preferred embodiment of the present invention will be described as follows.

First, the present invention is a seating step 12 formed stepwise on the outer circumferential surface of the rotating body 11 of the impeller 10 provided for the liquid cargo loading and unloading pump (not shown) of the LNG tank; And an inner diameter smaller than or equal to the outer diameter of the seating stepped 12, and includes a wear preventing part 20 secured to the seating stepped 12, and the wear preventing part 20 includes a seating stepped 12 and a rotating body. Cooling and fitting on the outer circumferential surface of (11), but the wear prevention part 20 is made of the same material as the impeller 10 and aluminum or aluminum alloy, thereby maintaining the life of the wear protection part 20 It will be possible to increase the convenience of management, increase maintenance efficiency, and reduce the number of work hours, thereby reducing maintenance costs.

In particular, the present invention is to be able to achieve the effect of extending the life of the impeller 10 because there is no damage to the base material due to replacement of the wear ring, that is, the damage to the rotating body of the impeller 10.

According to the present invention, if necessary, only the wear ring (not shown) on the diffuser (not shown) side needs to be replaced, so that the effect of reducing maintenance efficiency and maintenance cost can be achieved, which is the wear prevention part on the impeller 10 side ( Compared to 20), only the diffuser side, which has frequent replacement frequency, replaces the wear ring, so it is useful to reduce unnecessary amount of raw materials by reducing the number of replacement parts.

In addition, the present invention is a fixed welding line 50 formed by laser welding along the outer edge of the rotating body 11 and the inner edge of the wear preventing portion 20, the wear preventing portion 20 and the impeller 10 as a whole By further providing a wear protection layer formed by performing a film treatment by hard anodizing on the outer surface of the, it is possible to increase the wear resistance and increase the durability by using the wear protection unit 20 as the same material as the impeller 10. to be.

And, according to the present invention, the first length (d1) of the wear-resistant portion 20, which is a ring-shaped through both ends, is greater than or equal to the second length (d2), and passes through the first length (d1). The line is parallel to the virtual line CL penetrating through the center of the abrasion prevention part 20, making it difficult and difficult to maintain balance of the impeller 10, which is a high-speed rotation part according to the installation of the abrasion prevention part 20. It has the advantage of minimizing work.

In addition, the wear preventing part 20 according to the present invention includes a ring-shaped wear ring 20, and the wear ring 20 is made of the same material as the impeller 10, thereby increasing the durability of the entire device. By increasing the replacement cycle, it will be possible to significantly increase convenience for maintenance and repair.

And, according to the present invention, the thickness t1, which is the distance from the inner edge to the outer edge of the wear protection part 20, the upper surface of the seating stepped 12 protrudes radially outward from the outer circumferential surface of the rotating body 11 By being formed to be greater than or equal to the length t2, it has the advantage of being able to perform the intrinsic function of the wear ring according to the formation of the friction portion while preventing leakage of lubricant and contaminants together.

In addition, according to the present invention, it is formed on the outer circumferential surface of the wear protection unit 20 to further check the wear level or to further include a detectable wear check means 30 to help in grasping the correct replacement time according to the check of the wear level. Since it can be provided, it is possible to provide a product with high safety and reliability by preventing malfunction and failure of the device.

In addition, the wear confirmation means 30 according to the present invention is formed in a ring shape protruding along the outer circumferential surface of the wear protection unit 20, the wear confirmation ribs 31i arranged in parallel and spaced toward the seating stepped 12 By including 31m, 31f), it will be possible to smoothly perform the role of the labyrinth seal formed on the existing wear ring.

In addition, the wear confirmation means 30 according to the present invention, the outermost wear which is respectively disposed on one end side and the other end side of the outer circumferential surface of the wear protection unit 20 among the plurality of wear confirmation ribs 31i, 31m, 31f By further providing an incision 32 formed in an incision at a predetermined distance in each of the abrasion confirmation ribs 31m disposed inside each of the confirmation ribs 31i, 31f, the internal distribution of the lubricant in the labyrinth seal described above is further provided. It will also allow the side effect of slowing the wear rate.

In addition, according to the present invention, it is fixed to the seating step 12 and fixed to the rotating body 11 to prevent the separation between the inner circumferential surface of the wear-resistant portion 20 and the outer circumferential surface of the rotating body 11 fixed By further providing a pin 40, it will be possible to help maintain a firm and sturdy fixed state of the abrasion prevention part to the rotating body.

In addition, the anti-separation pin 40 according to the present invention is made of a material having a hardness equal to or greater than the abrasion prevention part 20 and the rotating body 11, so that durability and strength of the entire device can be maintained. In other words, it is possible to maintain a firm and rigid fixed state over a long period of time.

As described above, according to the present invention, the wear ring of an impeller for an LNG pump to increase maintenance efficiency, durability and lifespan by slowing down the degree of wear at a portion where friction wear occurs during high-speed rotation of the loading and discharging pump impeller of LNG. It can be seen that providing an assembly is a basic technical idea.

And, of course, many other modifications and applications are possible to those skilled in the art within the scope of the basic technical idea of the present invention.

10...impeller
11...Rotary body
12... seated chin
20...Abrasion prevention part (wear ring)
30...Abrasion confirmation means
31i, 31m, 31f... wear-resistant ribs
32... incision
40...Ejection prevention pin
50...fixed welding line
CL... virtual line penetrating the center of the abrasion prevention part 20
d1...first length
d2... second length
t1...thickness
t2...Length protruding radially outward from the outer circumferential surface of the rotating body 11

Claims (13)

A seating stepped to be formed stepwise on the outer circumferential surface of the rotating body of the impeller provided for the liquid cargo loading and unloading pump of the LNG tank; And an inner diameter smaller than or equal to an outer diameter of the seating stepped, and includes a wear preventing part seated and fixed to the seated stepped,
The wear prevention portion wear ring assembly of the impeller for an LNG pump, characterized in that fitted to the seating step and the outer peripheral surface of the rotating body is fitted with cooling. The method according to claim 1,
The wear prevention portion wear ring assembly of the impeller for an LNG pump, characterized in that made of the same material as the impeller. The method according to claim 2,
The material,
Wear ring assembly of the impeller for an LNG pump, characterized in that the aluminum or aluminum alloy. The method according to claim 1,
The length (hereinafter, the first length) from one end of the inner circumferential surface to the other circumference of the inner circumferential surface of the wear-preventing portion, which is a ring shape through which both ends are penetrated, is greater than or equal to the length (hereinafter referred to as the second length) from the seating end to the end of the rotating body And
The wear line assembly of the impeller for an LNG pump, characterized in that the imaginary line passing through the first length is parallel to the imaginary line passing through the center of the wear prevention part. The method according to claim 1,
The wear prevention unit,
Includes a ring-shaped wear ring,
The wear ring assembly of the impeller for an LNG pump, characterized in that made of the same material as the impeller. The method according to claim 1,
The thickness, which is the distance from the inner edge to the outer edge of the wear preventing portion, is a wear ring of an impeller for an LNG pump, characterized in that the upper surface of the seating step is greater than or equal to a length protruding radially outward from the outer peripheral surface of the rotating body. assembly. The method according to claim 1,
The wear ring assembly of the impeller for an LNG pump, characterized in that it is further formed on the outer circumferential surface of the abrasion prevention part to check the degree of wear or detectable wear. The method according to claim 7,
The wear confirmation means,
A wear ring assembly of an impeller for an LNG pump, comprising a wear confirmation rib protruding in a ring shape along an outer circumferential surface of the wear preventing part and spaced in parallel in plural toward the seating step. The method according to claim 8,
The wear confirmation means,
Among the plurality of wear confirmation ribs, an incision part that is incised at a predetermined distance is further provided for each of the wear confirmation ribs disposed inside each of the outermost wear confirmation ribs respectively disposed at one end side and the other end side of the outer circumferential surface of the wear prevention portion. Wear ring assembly of the impeller for an LNG pump, characterized in that it comprises. The method according to claim 1,
Wearing ring of the impeller for an LNG pump, characterized in that it further comprises a release preventing pin that is fixed to the seating step and fixed between the inner circumferential surface of the abrasion preventing part fitted to the rotating body and the outer circumferential surface of the rotating body. assembly. The method according to claim 10,
The anti-separation pin is made of a material having a hardness equal to or greater than that of the anti-wear part and the rotating body. The method according to claim 1,
A fixed welding line formed by laser welding along the outer edge of the rotating body and the inner edge of the wear preventing part,
The wear preventing assembly of the impeller for an LNG pump, characterized in that it further comprises a wear preventing layer formed by performing a film treatment by hard anodizing on the outer surface of the wear preventing portion and the entire impeller. A wear ring assembly for an impeller for an LNG pump, characterized in that it comprises a wear ring of the same material as the impeller which is fixed by cooling and fastening on the outer circumferential surface of the impeller provided for the liquid cargo loading and discharging pump of the LNG tank.

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