SA515370324B1 - Corrosion and Erosion Preventing Structure and Pump Comprising same, and Pump Manufacturing Method and Repairing Method - Google Patents

Abstract

Provided is a structure that prevents occurrence and advance of corrosion between materials even when a casing and a casing ring (liner ring) 19 are of different kinds of metal materials, and prevents erosion by cavitation due to a leakage flow that passes through a gap between the casing and the casing ring due to advance of corrosion. An erosion preventing structure in a vicinity of a location where the casing and the impeller 9 face each other includes the casing, the casing ring 19 that is placed at the casing and faces the impeller 9, and an electrical insulating material 17A that is provided between the casing and the casing ring 19. Fig. 2

Description

Corrosion and Erosion Preventing Structure and Pump Comrising Same, and Pump Manufacturing Method and Repairing Method Full Description BACKGROUND The f of the present invention relates to a pump utilizing a casing ring (an liner) dag in particular closely relates to a pump of the type in which the inflow flows in a direction radial to a rotating shaft in oda flow from the pump impeller; Jie Double Suction Centrifugal Pump » Multistage Centrifugal Pump » Pump with suction snail and attached to anti-erosion structure of the casing ring (liner ring) and pump included. Furthermore; The invention relates to a method of manufacturing and repair of a pump. A casing ring (liner ring) and an impeller ring (ASU ring) of a pump are located at the boundary between a high-pressure part and a low-pressure part of the pump impeller. The casing ring is fixed to the casing and does not rotate 0 as the impeller ring rotates with the rotation of a rotating shaft. Thus; Basically the design of the casing ring and the deal ring) to be in dlls non-contact with each other” and a very small gap was formed between the casing ring and the Ae Ball ring for example; Figure 10 shows a typical type of pump in which the inlet flow flows In a radial direction in the inlet part 159 of the impeller 59. An undisclosed electric motor 5 1 Jie motor is connected to the rotating shaft 57 of the pump. The PPE 59 rotates by the thrust of the motor. A liquid flowing into the channel of the suction side 61 in The radial direction from an outer side in the radial direction of the rotating shaft 57; and with a flow in the inlet gia 159 of the impeller as shown by arrow 50c in Fig. 10.

The fluid flowing into the impeller 59 from the suction gate channel 61 receives rotational energy of the impeller 59; And become a liquid in which pressure energy and kinetic energy are enhanced by centrifugal force. to hold pressure energy; The ola of the casing 53 is formed as a partition wall 65 to separate the suction side channel 61 and the drain side channel 63.

A casing ring 69 is supplied at the oa Jia terminal site of the partition wall 65 of casing 53; and the dials (slide on, depending on the circumstances) of the ticker 59. In the meantime; A deal ring 60 is provided on the impeller 59. Lad as another example Fig. 11 Ble for a sectional view showing an example of a double suction screw pump 101. The double suction cyclone pump 101 shown in Fig.

0 11 over De upper 103; Lower casing 105) Rotary shaft 107 is placed in a boundary zone between both casings 103 and 105, and an impeller 109 is placed on the rotary shaft 107. In both casings 103 and 105; the suction side channels 111 and the discharge side channels 113 are formed by the plunger 109. The impeller rotates 109 By rotating the rotating shaft 107 to which the Jie motor is attached Electric motor is not

5 explain it. by rotation; de Ball (aia 109) liquid from the suction-side channels 111 on both sides with the discharge-side channel 113 as the center. Hence, in the suction-side channel 111, the inflows flow in a radial direction in the inlet portions 109 of the impeller 109. The specific rotational energy is given by the impeller 109 of the liquid as a centrifugal force, and converted into the pressure energy and the kinetic energy of the liquid itself. To retain the pressure” the casing parts 103 and 105 are formed as walls

0 fragmentation 115 to separate the suction-side channel 111 and the discharge-side channel 113. A location that is terminal ohn of the fragmentation wall 115 is indicated for all casings 103 and 105; and slide with deal 109 in detail in Fig. 12 which is an extended projection of area A in Fig. 11. As shown in Fig. 12; In the aforementioned positional relationship; The casing ring 119 is supplied on the partition wall 115 which is the eda of the casing 105; The impeller ring is provided

0 on Bad .109 de Ba) that no dala of say ob Structures similar to area a are found in a symmetrical part about the rotary pole in call and a symmetrical part about a central line a. In Pump 101 shown in the above; In a location where the casing ring 119 and the bubble ring 110 face each other, a leakage flow is generated passing through a gap between each of them from a high-pressure side towards a low-pressure side. And where the gap is designed to be small las

They both inevitably come into contact with each other. Thus, even though the casing ring 119 does not have to have this required performance (Jalal for the casing ring 119), this material is chosen which cannot have a problem even if the casing ring 119 comes into contact with the impeller ring as long as the pump is lubricated 101 with a liquid to be connected.The material of the casing ring 119 is chosen for the reason

0 above; And therefore; The casing 105 and casing ring 119 are often fashioned from a combination of different types of metallic materials. casually When two different types of metals come into contact with an electrolysis solution in the event that these metals are in contact with each other, the corrosion is enhanced compared to the case of a single metal. This phenomenon is called corrosion, which occurs due to the migration of electrons from a metal with a high tendency to ionize to a metal with a high tendency to ionize

5 - with a low tendency to ionization due to the potential difference between the metals; Metal atoms that have lost electrical charges dissolve in a solution as ions. For example; When cast iron widely used as a material for pumps is subjected to water containing a large amount of dissolved oxygen; even individually; Erosion progresses at a rate of approximately 0.1 to 0.2 mm per year. However; in the event that the cast iron is in electrical contact with a (noble) metal which has a greater corrosion potential than the cast iron; like

0 STAINLESS STEEL SEY is also accelerated and the corrosion rate is twice as high as when the cast iron comes out individually based on the sheath. Subsequently; A gap can also be produced and widened by corrosion; between the casing and the casing ring after the pump has been running for a long time. in conventional pumps; Surfaces made of metal without a shell are in direct contact with each other; between the casing rings and the casings; in many cases. For example; when choosing

5 The combination of cast iron casing and stainless steel casing ring is formed into a gap

approximately 1-2 mm in 10 years between the casing and the casing ring”; In some (Yall) when the wear rate of individual cast iron is assumed to be 0.1 fae yr; the rate of reinforcement in contact with stainless steel is assumed to be 2 times higher. As described above; the casing ring is located between the high pressure sia shally Low pressure in the pump.Therefore, the gap is extended between the casing and the casing ring, and the high-pressure part and the low-pressure part connect with each other and pass through

fluid through the gap. as a result; A new leakage flow is generated; Away from the leakage flow between the casing dala and the impeller ring. Furthermore it; when (ul) the pump is high; The pressure difference between the high-pressure side and the low-pressure side becomes large; The leakage flow has a very high rate when the flow is ejected

0 leakage to the low pressure side. Subsequently; A cavity is generated around the casing ring. The sabe (SB) causes metallic cavitation; therefore, JST is sometimes generated not only on the site where the CO ring and jacket come into contact with each other (andl) but also on a jacket surface adjacent to the site. Particularly in cast iron which is widely used Extensive in the material of pumps; the damage is on the surface at the current where the JCB which Lay is overlapped due to the contact of different types of

5 Metals and cavity erosion are dangerous. when the leakage flow increases; cover damage progress; The required performance of the pump is not met. Also the pump resistance is reduced; The possibility of pump breakage on a larger scale also increases. La in the pump; An 'inlet backflow' with bore is often generated in the impeller portion; at times of low flow rate. This is due to the restriction of the flow rate by opening and closing a valve that is

0 and place it at the dimensional side of the impeller. As shown in Figure 13; The inlet backflow phenomenon is a phenomenon in which the recirculating fluid flow is generated to the side of the suction side channel 61 from the inside of the bubbler 59. The inlet backflow contacts the fragmentation wall 65 near the casing ring 69 and also promotes wear” because the location of Generating inlet backflow is near casing ring 69.

General description of the invention

Technical problem: However; No traditional art is known to prevent damage to the surface by cavity erosion

Which interferes on the wear between casing and casing ring (liner ring) This Jie. Hence, it is invented

current demand in light of the problem described above; It prevents the generation and progression of corrosion between joint materials even when the casing and casing ring are made of different types of metallic materials. clad provides invention

The current demand is a structure that prevents erosion of the bore due to seepage flow; in the gap that is generated between

Cover and cover ring. Furthermore it; The present application invention provides a structure that prevents erosion of the casing (wall

fragmentation) near a shell loop due to the “inlet backflow” effect generated by its concomitant

For cavity in de Ball at low pump flow rate time.

0 Solve the problem:The first way to solve the aforementioned problem is a SUI blocking structure placed next to a location where the shell and the impeller face each other; including casing; a casing ring to be placed at the casing and impeller faces; An electrical insulating material is provided between the casing and the casing ring. by Jab similar»; Jie ring casing and casing are electrically applied by the insulating material; Corrosion is not caused by contact of different types of metals between the casing ring and the casing; Progress is restricted

5 Corrosion. Furthermore it; A pressurized liquid can be prevented from flowing through a gap between the casing ring and the casing by the dielectric material. Thereby corrosion is prevented by cavitation; Increased leakage flow between the casing ring and the casing due to corrosion. The second method is an anti-erosion structure described according to method 1 in which the dielectric material includes an epoxy; or silicone material. by the inclusion of an electrically insulating material

includes at least one epoxy; Silicone and PTFE material between the casing and casing ring; The insulating material does not separate or disintegrate” and remains attached; even when the pump vibrates; The impact and the heat of friction at the time of sliding, and the same occurs; In the case when the pump has been running for a long period of time. Subsequently; The pressurized liquid remains prevented from flowing through the gap between the casing and the “DUR” and electrical contact and electrical contact of the casing and casing can also be prevented.

The third method is a syntax that prevents JS and stripping described by means 1 or 2; Where a -0 sealing ring is placed at the bounding surface of the casing and casing ring. by doing something like that; In the case that the pump has been running for a long period of time; The sealing performance is maintained by loop -0; Even when the electrically insulating material is broken or peeled off from the casing ring (Cally) due to the vibration of the pump; of the casing ring and casing The fourth means is an anti-erosion structure described according to any of means 1 to 3 whereby an outer flange extension portion extending outward in a radial direction from a main pump shaft is provided from a location facing the impeller at a low pressure side of the casing ring By doing something similar, the casing ring also extends outward radially into the suction channel does not hit the backflow bore directly ang (DU) the casing is protected by the casing annulus. Jia fifth method in a structure that prevents JST and erosion is described according to method 4 The difference between the angle of the cantilever end shear of the outer flange extending part and the angle of the outer edge of the impeller 5 facing the cantilever end of the outer flange is within 10 degrees.In this way, the fluid flow is smooth and the loss caused by the level difference is reduced. The sixth method is a structure that prevents corrosion and erosion described according to any of means one through five; Where the casing ring is designed by coupling two members. this way; Even if the casing and the electrically insulating material take complex shapes; The intricately shaped casing ring can be positioned accordingly. also; In a pump of a type in which the upper casing and the lower casing are not separated; The casing ring can be easily molded into the complex shape. The seventh method is a pump comprising an anti-erosion structure described according to any of means one through six; Main pump shaft rotatably supported by casing; delay is supplied to the main pump shaft; and a fluid channel formed inside the casing.

The eighth means is a method of making a pump comprising a casing and an impeller; Where jacket 3 is supplied dielectric material is supplied at a predetermined point of jacket 3 and a predetermined jacket ring facing de Bal) is placed at the jacket through the dielectric. The ninth method is represented by a repair method from a pump comprising a casing and an impeller ¢ Cua an electrically insulating material is supplied at a predetermined point of the casing and a predetermined wale facing the bubble is placed at the casing through the dielectric material. the beneficial effects of the invention by means of the relevant means described above; For example, 1) corrosion prevention between the casing ring and the casing can be achieved; 0 2) prevent leakage flow between the casing ring and the casing due to the corrosion described above; 3) Prevent cavity erosion due to seepage flow; and (lad 4) prevent erosion next to the pump casing annulus by means of an “inlet backflow” bore generated next to the pump suction port at low flow rate time. Brief Explanation of Drawings 5 Figure 1 is a general sectional view of a pump incorporating structure JST and stripping are prohibited according to one of the embodiments of the present application invention. 1 Fig. 4 is an extended sectional projection of the La AT z model in region A in Fig. 0 1.

Figure 5 is an extended sectional projection of the La AT z model in region A in Fig. 1, and Figure 6 in an extended projection of z J gail B in Fig. 5. Fig. 7 is an extended sectional view of an embodiment of a pump in a position different from one of the embodiments of the present invention. Fig. 8 is an extended sectional projection AT z J gail 3 into the pump from a position different from one of the embodiments of the present invention. Figure 9 is an extended sectional projection of the AT model as well. In the pump from a position different from one of the embodiments of the present application invention. 0 1 Figure 0 1 is a general sectional view of a conventional pump. Figure 1 1 is a general cross-sectional view of a conventional pump. Figure 12 is an extended sectional projection of region A of the pump revealed in Figure 10. Figure 13 is an illustrative projection of an “inlet backflow” with a bore in the gin bubbler 5 at low flow rate time Detailed description: Description of models after (alld) With reference to the drawings, one embodiment of the present application is described. Outline diagram : 0 Figure 1 is a sectional projection showing an outline plan of a double suction snail type 1 Tay pump of the present embodiment. Pump 1 includes Top cover 3; bottom cover 5; column

— 0 1 — Roundabout 7 is located in the boundary area of both covers 3 and 5; and an impeller 9 is provided at the rotating shaft 7. in both cases 3 and 5; The suction side channel 11 and the discharge side channel 13 are formed via deal) 9. The suction side channel 11 and the discharge side channel 13 include fluid channels. [casing] As described as lel, pump 1 of the present model is a double-suction screw pump of a type that sucks liquid on both sides with the discharge-side channel 13 as the center. Subsequently; Partition walls 15 separating the suction side channel 11 and the discharge side channel 13 are provided within casings 3 and 5. Jam a feature of the current model in a structure next to a location representing the terminal gia of each of the 15 hash walls of shells 3 and 5; and the faces (which slide with) the impeller 9. The facing position 0 is shown as area A in Fig. 1. [Rotating shaft] A motor such as an electric motor not shown is attached to the rotating shaft 7 of pump 1. by the thrust of the prime mover; The impeller 9 which is placed at the rotating shaft 7 is rotated in pump 1 of the present model; The rotating shaft 7 is supplied along a horizontal direction. Thus dell 9 5 rotates along a vertical surface crossing the rotating shaft 7. However; The rotating shaft in the horizontal direction in the current model is just an example Sarg allows the rotating shaft to be placed along the vertical or other angle directions. The rotating shaft 7 is inserted between the upper cover 3 and the lower cover 5 via dela 7a. The location where the carrier is placed 17 represents a boundary between the suction side channel 11 and an external medium. Subsequently; A fluid-sealing structure (not shown) is provided in the holder 7 so that no liquid in the Egyption side channel 11 leaks out. [de 18] The impeller 9 rotates with the rotation of the rotating shaft 7 and sucks liquid from the suction side channel 11 at both sides with the discharge side channel 13 as the center. The inflow positions 19 of the impeller 9 are machined in the vicinity of the rotating shaft 7 and the suction side channel 11 is machined outward in the direction of

Radial of the 9 internal flush positions that have been described above. Subsequently; in the sucking side canal 11; It flows inward in the radial direction flowing in the inflow positions 10 of the impeller 9. Rotational energy of the impeller 9 is given to a fluid flowing inward as a centrifugal force. Kinetic energy is expressed by centrifugal force. so; The rotational energy of the wheel 9 is converted into pressure energy and kinetic energy as a result. Accordingly »the pressure in the discharge-side channel 13 becomes a proportionally greater pressure than the pressure in the outlet-side channel 11. To retain the pressure« parts of the casing are provided as partition walls 5 to separate the suction-side channel 11 at the low-pressure side and the downstream channel 13 at the high-pressure side. at the location (area A in Fig. 1) representing the terminal portion of partition wall 15 of each shell 0 3 and 5; faces (slide with) dell 9 supplied dala cover 19 at partition wall 15; and a dela 10 ring is provided at deli 9. This point is described in detail when the enlarged projections shown in Fig. 2 to Fig. 5 are shown. It is needless to mention that structures similar to those of region A are also placed in ein. symmetrical about rotating shaft 7 in the drawings; as symmetrical about the central line [L Lala [5 casing] as shown in Figure 2 in the pump according to the present model; The bellows 9 and dela ring 10 are very similar to those of a conventional pump. cla The structure at the casing side differs from that of a conventional pump. any; The feature lies at the point where an insulating material 117 is supplied between the casing ring 19 and the end portion of the casing partition wall 15. 0 The dielectric material 117 of the present model is semi-circular in shape; And it is packed in Ala, in which the dielectric material 117 adheres closely to both the cover ring 19 and the fragmentation wall 15. As the dielectric material 117 adheres closely to the jacketing ring 19 and the fragmentation wall 15 Jie, a gap is not formed between the casing ring 19 retail wall 15; no leakage flow is generated; Electrical contact can also be prevented for both of them.

For the electrical insulating material 817, Jie resin can be used as an insulating film; sale insulating coating; Insulating adhesive. Lad Fiber reinforced plastics and particle reinforced plastics can also be used. Furthermore it; besides the resinous materials; Low fusing glass with insulating properties may be used; Ceramic adhesives and the like. However; vs. vibration » shock; change in temperature, etc., by operating the pump for a long period of time; Continued restoration of dielectric retention functions is required; retaining fluid performance; and maintain dimensional accuracy. Subsequently; as suitable material for the above; epoxy preferred; Silicone or Sale PTFE electrical insulator. in articles; Outflow of components into water or absorption of components do gray occurs even when materials are used in water; Subsequently; The material hardly breaks down to 0 after using the material for a long period of time. when the electrically insulating epoxy or silicone material is a sale liquid or gelatin insulating coating or insulating adhesive; Adhesion (affinity) to a metal surface is preferred. Subsequently; when at least any of the casing partition wall 15 or casing ring 19 is coated with the dielectric material; the compatibility of the painted surface with the surface of the other; The dielectric material is spread on the matching surfaces of the partition wall 15 of the CDG casing and ring 19) and a film-like layer of dielectric material is formed between each of them. The film-shaped layer is the dielectric material 117 of the present model. Processing progresses Gradually to a certain extent in the film-formed layer;the film-formed layer reaches a solid state.The solid-state film-formed layer has both high adhesion resistance and high fracture resistance.Therefore, even when pump vibration, impact, Sha 0 friction and the like when slipping" in Alla where the pump is operated for a long period of time; the dielectric 117 remains closely adhered without breaking or loosening. Thus, a pressurized fluid can be prevented from flowing between the partition wall 15 of the casing and the casing ring 19 Electrical contact and electrical contact of the casing ring 19 and the partition wall 15 can be prevented. When the dielectric material is silicone or PTFEsale, it is preferable to form the dielectric material in the form of a film and insert it between the matching surfaces of the partition wall 15.

and casing ring 19. The silicone material (PTFE) does not lose its viscoelasticity even when the silicone material is cured, and thus adheres closely to a metal surface when the surface roughness of the metal surface is low. A silicone film molded product is prepared in advance, so that the insertion between the partition wall 15 and the casing ring 19 is effective.

Insulating and insulating adhesive coating works. The thickness of the electrical insulating material filling is preferably between 0.005mm to 2mm; For example; in the case of 0.05 mm or more; The membranous form is most preferred; and in the case of less than 0.05 mm; It is preferable to paint with an insulating coating material; or adhesive tape. to ensure tight adhesion to the hash wall 15 and the casing ring 19; It takes the sectional shape of matter

0 Dielectric 117 Gage Rectangular. this way; Even when impact or the like is applied to the fragmentation wall 15 and casing ring 19, peeling of the dielectric material from the fragmentation wall 5 and the like is prevented. However; The syllabic figure exists as an example of cath and is not limited to the present invention. Figure 3, Ble, on a projection showing a second model. The model shall be a structure that prevents corrosion and erosion, in which a “dielectric” ring is installed in addition to the previously mentioned electrical insulating material 117

5 already. any; An annular notch © 23 is formed in the outer circumferential surface of the casing ring 19; A 0-23b ring is provided in the 0-ring notch L123 when the pump has been running for a long period of time; Dielectric 17b can be conceived to break; their removal from the casing ring 19 and casing 006415 due to pump vibration; Impact and friction temperature at the time of sliding. In this case; The sealing performance can be maintained by loop -0. Subsequently; Even if a gap is formed between dala cover 19 and a wall

0 hash 15; The sealing performance can continue to be maintained so that no liquid will pass through the gap. In this way reinforcement is also made so that the casing ring 19 and the fragmentation wall 15 of the casing do not electrically contact. In the case of the model that uses the -0 loop; The -0 loop has the function of retaining the leakage pile performance to prevent leakage flow. Therefore, the dielectric material 17b to be inserted between the matching surfaces of the casing ring 19 and the partition wall 15 need not have very close adhesion to the matching surfaces 0 however;

5 in the case using a -0 loop; The use of the -0 loop is provided that the -0 loop itself collapses

To ensure a fluid's sealing performance to a certain extent or more. In this case; in front and behind (left and right of the -0-ring in Figure 3) the -0-ring with the -0-ring as the point of support; The pressures adjacent to the casing ring 19 and the fragment wall 15 are not uniform. Hence, the dielectric material 17b inserted in between the matching surfaces of the casing ring 19 and the partition wall 15 is also desirably supplied.

As a silicone or PTFE component molded to a thickness of approximately 0.05 mm to 10 mm to prevent the jacket ring 19 and the hash wall 15 from contacting each other even at a single point; It receives adjacent stresses that are exerted on the conforming surfaces. Figure 4 shows a third model. in the form; Anti-erosion structure in which an outer edge at low pressure side (suction side channel 11) of the casing ring 19 extends outward in the direction of

0 radial of the rotating shaft. Hereinafter in this document; An extended gia is referred to as an outer flange extension portion 119 The outer flange extension portion 19a at the low pressure side of the casing ring 9 covers the partition wall 15 of the casing extensively. this way; Even when generating inlet backflow with bore in the suction side channel 11 of the dell 9 at low flow rate operation time from the pump; cover ring 19 protects the wall of jal 15; And therefore; Erosion progression can be prevented.

5 and for extending outwards in the radial direction from the outer flange extending part 19 relative to the rotating shaft” a diameter approximately 1.5 times the diameter of the inner flow shear 19 of the ticker 9 is sufficient 0 In form (lal) a dielectric fill sale 17g is sufficient It also has a predetermined thickness between the flange extension part 119 and the partition wall 15. By forming this gia 119 Jie the partition wall 15 can be protected from bore erosion; Even if the casing ring 19 is forged from a strong metal

0 on stripping; For example (Ji) cast steel, which is not (Jug daa) forming the casing (fragmentation wall 5) of a weaker metal against erosion than stainless steel, but it is widely used; for example (JE) cast iron. In a pump Hb central double with suction screw and pump with suction screw The suction channels are not always radially symmetrical with respect to the rotating shafts of the pumps, but are often asymmetrical;

The outer edge to be asymmetrical in the same way Jie shapes the suction channel so that the suction channels and the extension parts of the outer edge are connected in series 119 . Figure 5 shows a fourth model. In the model » there is a structure to prevent erosion and erosion such that the difference between the slope of an outer edge of the CO ring 19 facing the side of the inner flow part 19 of the impeller 9 which approaches very close; At a low pressure side of the casing ring 19 (ie; at an outer edge at a side

the channel of the suction side 11» and the inclination of an outer edge facing the side of the cover ring 19; From gia the inflow 9a to bubble 9 is approximately 10 degrees (area b in Fig. 5). Figure 6 is a projection of an expanded area B in Figure 5. In Figure 6; Adjusts the inclination angle of the outer edge facing the side ea of the inner flow deal 9 approaching

0 strongly; at the low pressure side of the outer edge of the casing ring 19; b of degrees The inclination angle of the outer flange facing the side of the casing ring 19) of the inner flow part of the bubbler is set to 9b ar degrees. In this document; by adjusting the angles so that the absolute value of o - 6 is 10 degrees; the fluid flow becomes smooth; Reducing the loss caused by the level difference Figure 7 is a projection showing a key part for an example in which a structure is applied.

5 prevents corrosion and erosion according to the present embodiment on a pump of a type in which the internal flow flows in the radial direction in the internal flow gla 19 of the bellows 9. The electrical insulating material 17e of the model takes the form of a letter -a in section. A motor such as an electric motor not shown is attached to the rotating shaft 7 of the pump; The pusher 9 is rotated by the driving force of the prime mover. The liquid flowing into the inner channel passes through the suction side channel 11 between the side cover 14 and the partition wall 15

0 of the casing” and with an inward flow in the radial direction from an outer side of the rotating shaft 7. Thereafter; The fluid flows into the impeller gia inflow 9 of the impeller 9 as arrow c in Fig. 7. The fluid flowing into the impeller 9 from the suction-side channel 11 receives rotational energy de Ball 9; It is transferred to the coast characterized by pressure energy and kinetic energy which is enhanced by centrifugal force. The discharge side channel pressure 13 becomes relatively larger than that of the side channel

sucking 11; to hold pressure; The suction side channel 11 and the discharge side channel 13 are separated by a partition wall 15 gal casing. in the pump of the current model; The rotating shaft 7 is supplied along the horizontal direction; And therefore; deal) 9 rotates along a vertical surface crossing the rotating shaft 7. However; The rotating shaft is in the horizontal direction in the current model only as an example. The rotating shaft can be placed along the vertical direction and other angle directions. In a location representing the terminal eis of the fragmentation wall 15 “DA and de Ball faces 9—the fragmentation wall 15 of the casing is provided with the casing ring 19) and the bubbler 9 is provided with the bubbler ring 10. Dielectric material 17e is supplied between the casing ring 19 and the terminal part to the fragmentation wall 15 of the casing, and the dielectric material 17e is filled to adhere firmly to the casing ring 19 and the fragmentation wall of the casing 15. Since 0 dielectric material 17e adheres firmly to the casing ring 19 and the fragmentation wall 15, no gap is formed between the casing ring 19 and the fragmentation wall 15. Fluid leakage, and the electrical contact of the casing ring 19 and the partition wall 15 has also been prevented. For the electrically insulating material 17e, any resin sale can be used; Fiber-reinforced plastics and 5 particle-reinforced plastics liad In addition to resin materials, low-melting glass with dielectric properties, ceramic adhesives, etc. However, the dielectric material needs to continue to retain dielectric retention functions. maintain gle performance to leak Dimensional accuracy is maintained by “fel” absorbing shock and temperature change in a pump operation that continues over a long period of time. Therefore, as a suitable material for this, the electrical insulating material 0 of epoxy is preferred; Silicone or PTFE. Materials break down hard after long-term use as components outflow into water and absorption hard even when used in water. if sale epoxy or electrically insulating silicone is sale insulating paint or insulating adhesive in a liquid or gelatinous state; It is best to stick (AN) to a metal surface. Subsequently; when coating any of at least one casing or casing ring; or both the CD and the casing ring with the dielectric material; 5 By matching the coated surface with the other surface, the coating agent is spread on the matching surfaces of the casing and ring

cover And a layer was formed in the form of a membrane of electrically insulating material between each of them. The treatment progresses gradually to a certain extent in the film-shaped layer; The layer, which takes the form of a membrane, reaches a solid state. The film in the solid state has both high adhesion and fracture resistance; Even when pump vibration occurs; Impact and heat of friction at the time of sliding and the like; in dlls where the pump is running for a long period of time; The insulation remains

Electrically bonded to day's image without breaking or separating. Subsequently; no gap is formed between the casing ring and the casing; The casing and casing ring are retained so that no leakage fluid flow is generated; The electrical contact and electrical contact of the casing ring and the casing can also be prevented. (Lia) When the electrical insulating material is silicone or PTFE sale, it is formed

0 The insulating material is preferably in the form of a film and inserted between the matching surfaces of the casing and the casing ring. Sale silicone or PTFE sale does not lose its elastic viscosity even at sale dallas silicone or PTFE sale and thus adheres firmly to the conforming surfaces when the surface roughness of the conforming surfaces described above is low. The casing and casing ring are standard; a molded silicone diaphragm is prepared in advance; thus, the insertion of the diaphragm between the casing and the casing ring is

5 active; And there is no irregularity in the amount of coating that easily occurs when Jee coating the insulating coating and insulating adhesive. The thickness of the filling of the electrical insulating material 17H is preferably between 0.005 mm to 2 mm approximately and in the case of 0.05 mm or more the Jal membrane is more preferred; and in the case of less than 0.05 mm; It is preferable to paint with an insulating coating material; or adhesive tape. Figure 8 illustrates a structure that prevents corrosion and erosion in which an electrically insulating © ring 23 is provided.

0 in addition to the dielectric material 17f disclosed in Fig. 7. An O-ring 23b is provided in the ring groove 0-23 that is formed in the partition wall 15. When the pump is in operation for a long period of time; Dielectric material 517 ¢ is sometimes broken and removed from dala shell 19 and shell 15; due to pump vibration; impact and friction heat at the time of sliding; and the like. In this case; where ile leak performance is maintained by loop 0 -23b; can continue

retaining the sealing performance so that the liquid does not pass through the gap; The reinforcement is also done so that the casing ring 19 and the fragmentation wall 15 of the casing are not in electrical contact with each other. The ring notch 0-23 can be machined on either the cover-ring side 19 or the cover-ring side 15. In this case; The loop 0-23b with electrical Jie characteristics plays the role of retaining the performance of the ple

to leak; Thus, there is no need for the electrically insulating material, 17, to adhere closely to surfaces that are very compatible with 0, however; in Alla using episode 0-23b; The use of the 0-ring 23b is provided that the predetermined amount of failure of the -0-ring is not the same and therefore the method of exerting contact pressure by the casing-ring 19 and the casing-15 in front and behind (left and right of the -0-ring in Fig. 8) the -0-ring with the -0-ring 23b as a point of consolidation.Therefore, the insulating material is desirably supplied

0 electrically 17 and also as a silicone or PTFE component molded to a thickness of 0.05 mm to 10 mm to prevent the casing ring 19 and the casing partition wall 15 from contacting each other even at a single point; It receives the contact stresses exerted on the conforming surfaces. Fig. 9 shows an anti-erosion structure in which an outer edge extends at the low pressure side of the casing ring 19a; any; At the channel side of the sucking side 11 outward in the direction

5 Radial pump shaft. The gia represents the extension gia the extension of the outer edge 19 The cover ring 19 is divided into two parts consisting of a first member 119 and a second member 19b. Subsequently; Even in a case where the shape of the conduction of an electrically insulating material 17g is complex, as in Figure 9; The first member 119 is placed at the ticker side 9; The second member 19b is placed at the channel side of the suction side 1 and the first member 119 and the second member 19b can be assembled by bolting 21.

0 Lad The anti-erosion and anti-erosion structure described above enables the assembly of an anti-erosion structure comprising an outer flange extension part 19 in a pump (section type or similar) of a type in which the upper and lower casing are not separated. also; The low pressure side of the second part 9b of the casing ring 19 covers the fragmentation wall 15 extensively. this way; Even if an inlet backflow with bore is generated in the suction side channel 11 of the impeller 9 at the time of operation

low flow rate of the pump; Erosion progression can be prevented; Where the second pial 19b is protected by a wall

hash 15. Even if the second gall 19b of the cover ring 19 is made of strong metal against stripping; For example; The no-daa casting steel and the partition wall 15 of the casing are made of a weaker anti-erosion metal than the second gall 19b of the casing ring 19; But it is widely used; For example Jbl can protect cast iron; The partition wall 15 of the casing of the cavity cart. The annotations shown above are described as constructs that prevent corrosion and erosion from the pumps. However; The invention of the present application may also be defined by a method of manufacturing from a pump. any; The invention of the present application is a method of manufacturing a pump comprising a casing and an impeller; It is a pump manufacturing method; in which the cover is supplied; Dielectric materials shall be supplied at predetermined points of the casing; Pre-selected 0 casing rings facing the impeller are placed at the casing through the dielectric material. The different features which are described in the description of the above models can be applied by pairing them with the pump manufacturing method. Furthermore it; The invention may also be defined by the method of repairing a pump. any; The present invention is a method of repairing a pump comprising a casing and an impeller; In which dielectric materials 5 are provided at predetermined points of the casing » Predetermined casing rings facing de Ball are placed at the casing through the dielectric materials. The repair is done after removing the pump temporarily. The various features described in the description of the previously mentioned models can be applied in conjunction with the pump repair method. Industrial Applicability: The present invention can be used in an anti-corrosion and anti-erosion shawl; For a pump that compresses and transports a liquid; It is a pump in which the casing and 0 casing ring (liner ring) are made of different types of metallic materials. The aforementioned embodiments are described with a view to assisting a person having ordinary knowledge in the technical field to which the present invention relates to carrying out the present invention. A person well versed in the art can naturally do various modification examples of the models described above; The technical idea of the present invention is applicable to other embodiments. Accordingly; The present invention is not limited to embodiments that have been made

Subtle and explicable on a larger scale follows the technical idea that is defined by the claims. (liad) The relevant invention that identifies matters described in the embodiments described above is provided that the invention design of the present application is designed individually or by pairing it at random. Reference List: I

A 1 shine - yesterday a

Claims (1)

Protections 1 - A pump for pumping a fluid; It comprises an anti-erosion structure having a gia with the casing and bubbler facing each other “andl.” The anti-erosion structure includes: a casing; a casing ring placed in the casing facing the impeller; And electrical insulating material placed between the casing and the casing ring so that the fluid does not pass through a gap between the casing and the casing ring from the high pressure side to the low pressure side and the casing and the casing ring do not contact each other; Where the dielectric material includes at least one silicone material and PTFE material, and the dielectric material is a wafer mold. 2 - the pump according to the element of protection 1; Where the shell forms and the casing ring in contact with the dielectric material is part of the SSE blocking structure, stripping has a rectangular waveform from Jala the casing towards the outside of the casing. 5 3 - Pump for pumping (pile) comprising anti-erosion structure having a part where the casing and pellet face each other “andl” and the anti-erosion structure comprising the following: a casing; a casing ring placed in the casing and facing the impeller; and an electrical insulating material It is placed between the casing and the casing ring so that the fluid does not pass through the 0 gap between the casing and the casing ring from the high pressure side to the low pressure side and the casing and the casing ring do not contact each other [Cun sand] An O-ring is placed for sealing on the boundary surface of the insulation material 4- The pump according to protection element 3 where the electrical insulation material includes at least one material of silicone and PTFE. — 3 2 — - The pump according to claim 3 where the shapes of the casing and the casing ring in contact with the electrical insulating materials are part of the JS prevention structure and Ble stripping of a rectangular waveform from the inside of the casing towards the outside of the casing. 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Ad Issued by + bb 0.b The Saudi Authority for Intellectual Property > > > This is PO Box 1011 .| for ria 1*1 v= ; Kingdom | Arabic | For Saudi Arabia, SAIP@SAIP.GOV.SA