CN105339674A - Corrosion and erosion preventing structure and pump comprising same, and pump manufacturing method and repairing method - Google Patents
Corrosion and erosion preventing structure and pump comprising same, and pump manufacturing method and repairing method Download PDFInfo
- Publication number
- CN105339674A CN105339674A CN201480035966.7A CN201480035966A CN105339674A CN 105339674 A CN105339674 A CN 105339674A CN 201480035966 A CN201480035966 A CN 201480035966A CN 105339674 A CN105339674 A CN 105339674A
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- China
- Prior art keywords
- pump
- housing
- impeller
- casing ring
- casing
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/06—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being hot or corrosive, e.g. liquid metals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/006—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps double suction pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
- F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/4273—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps suction eyes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/4286—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps inside lining, e.g. rubber
Abstract
Provided is a structure that prevents corrosion from occurring and progressing between materials even when a casing and a casing ring (liner ring) (19) are of dissimilar metal materials and that prevents erosion by way of cavitation caused by leaks that pass through gaps between the casing and the casing ring due to corrosion progression. An erosion preventing structure near the location where the casing faces an impeller (9) comprises the casing, the casing ring (19) that is disposed in the casing and faces the impeller (9), and an electrical insulating member (17A) that is provided between the casing and the casing ring (19).
Description
Technical field
The present invention relates to the pump using casing ring (packing ring), particularly relate to as double suction enter centrifugal pump, centrifugal multistage pump, have suck spiral case pump etc., with about being profoundly associated to the pump of the form of the inflow part of liquid stream inflow pump impeller in the radial direction of running shaft, the preventing corrosive attack from constructing and possess the pump of this structure of casing ring (packing ring).And relate to manufacture method and the method for repairing and mending of this pump.
Background technique
Casing ring (casingring) (packing ring, linerring) and the impeller ring (impellerring) (wear-resisting ring, wearring) of pump are present in the high-voltage section of pump impeller and the border of low voltage section.Casing ring is fixed on housing and non rotating, and on the other hand, impeller ring rotates along with the rotation of running shaft.Therefore, be substantially designed to casing ring and do not contact with impeller ring, make to keep small gap therebetween.
Such as, Figure 10 is the pump representing the general type flowing into the injection unit 59a of impeller 59 in radial direction to liquid stream.Not shown electric motor prime movers is had in running shaft 57 engaging of pump.Made impeller 59 rotate by the driving force of this prime mover.The liquid flowing through suction side stream 61 from side inflow radial direction the radial direction of running shaft 57 to, as shown in arrow C in figure, flow into the injection unit 59a of impeller.
The liquid flowing into impeller 59 from suction side stream 61 is accepted the rotation energy of impeller 59 and becomes the liquid that improve pressure energy and kinetic energy by centrifugal force.In order to keep this pressure energy, a part for housing 53 is formed as next door 65, suction side stream 61 and discharge side stream 63 to be separated.
In the end in the next door 65 of this housing 53 and the position of relative with impeller 59 (be not according to circumstances both and slide with impeller 59), be provided with casing ring 69.On the other hand, at impeller 59, there is impeller ring 60.
As another example, Figure 11 represents that double suction enters the sectional view of the example of turbine pump 101.Double suction shown in this Figure 11 enters turbine pump 101 and comprises: upper shell 103, lower shell body 105, the running shaft 107 being arranged at the borderline region of described two housings 103,105 and the impeller 109 be arranged on this running shaft 107.Further, in two housings 103,105, suction side stream 111 and discharge side stream 113 is formed with across impeller 109.
Impeller 109 rotates along with the rotation of the running shaft 107 engaged with not shown electric motor prime movers.By this rotation, impeller 109 sucks liquid from the suction side stream 111 of both sides centered by discharge side stream 113.Therefore, at suction side stream 111, in radial direction, flow into the injection unit 109a of impeller 109 to liquid stream.The rotation of impeller 109 can be given to liquid as centrifugal force, is converted to pressure energy and the kinetic energy of liquid self.In order to keep this pressure, a part for housing 103,105 is formed as next door 115, suction side stream 111 and discharge side stream 113 to be separated.
About the next door 115 of this housing 103,105 end and with the position that impeller 109 slides, describe in detail in the enlarged view and Figure 12 of the region A of Figure 11.As shown in Figure 12, with above-mentioned position relationship, casing ring 119 is located at the next door 115 as a part for housing 105, and impeller ring 110 is located at impeller 109.It should be noted that, self-evident, all there is the structure identical with region A in the part relative to the axisymmetry in figure with the part relative to centre line L symmetry.
Above, in illustrative pump 101, at casing ring 119 opposite site with impeller ring 110, produce the leakage through gap therebetween from high side to low side.Because this gap design obtains very little, the two contact therefore cannot be avoided.Therefore, for casing ring 119, although do not require that it has performance such required by bearing, if by the liquid lubrication of pump 101 liquor charging, even if then will select to contact the material that problem does not occur yet.For this reason, when selecting the material of casing ring 119, in most cases, housing 105 and casing ring 119 select the combination of dissimilar metals material.
But, when two kinds of different metals contact electrolyte solution under the state of electrical contact, compared with adopting the situation of single metal, encourage corrosion.This is that electronics is from the strong metal of ionization tendency to the weak metal migration of ionization tendency due to intermetallic potential difference, and the metallic atom losing electric charge becomes ion and stripping in solution, forms corrosion phenomenon thus.Such as, the widely used cast iron as the material of pump, when being exposed to separately the water containing more dissolved oxygen, corroding with 1 year is the speed progress of about 0.1 ~ 0.2mm.But compared with the cast iron of stainless steel etc., cast iron is under the state of (expensive) metal electrical contact high with corrosion potential, and corrosion is accelerated further, according to circumstances different, sometimes reaches the rate of corrosion of more than 2 times during cast iron individualism.Therefore, between the housing having carried out pump running for a long time and casing ring, sometimes gap is produced because of corrosion and gap enlargement.
In pump in the past, be mostly between casing ring and housing to be in direct contact with one another with the intermetallic composite coating face without application.Such as, when select housing be cast iron, casing ring be the combination of cast stainless steel, suppose that the rate of corrosion of independent cast iron is 0.1mm/y, the growth encourage rate caused because contacting with stainless steel is 2 times, then there is the situation in the gap forming about 0.1 × 2 × 10=2mm between housing and casing ring in 10 years.As mentioned above, casing ring is present between high-voltage section in pump and low voltage section.Therefore, the gap enlargement between housing and casing ring, high-voltage section is communicated with low voltage section and fluid passes its gap.As a result, except the leakage between casing ring and impeller ring, also new leakage can be there is.
And when lift of pump is high, the pressure difference of high pressure side and low voltage side becomes greatly, becomes hypervelocity when leakage is ejected into low voltage side.Therefore, generation cavitation erosion around casing ring.Cavitation erosion meeting attack metal material, therefore sometimes comprise the position of casing ring and body contact, surface of shell in its vicinity produces and corrodes.
Especially, in the widely used cast iron of the material of pump, surface failure when this dissimilar metals contact corrosion and cavitation erosion superposition is remarkable.If such leakage increase and shell damage aggravation, then become the performance that cannot meet greatly required by pump.And the intensity of pump case reduces, produces the possibility raising of more massive pump breakage.
In addition, pump appears in the situation that impeller portion produces " entrance adverse current " with cavitation erosion more when low discharge.This is because flow is arranged at the opening and closing of the valve in impeller downstream side and limits.As shown in figure 13, this entrance backflow phenomena be produce fluid from the inside of impeller 59 situation to the flowing of suction side stream 61 side recirculation.The generation place of this entrance adverse current, close to casing ring 69, therefore also contacts with the next door 65 close to casing ring 69, aggravates further to corrode.
Summary of the invention
Invent problem to be solved
But, in real number in the past, and unclear to prevent the corrosion between so same housing with casing ring (packing ring) from superposing cause surperficial damage because of cavitation erosion.Therefore, the present invention puts in view of the above problems and makes, even if when housing and casing ring are dissimilar metals material, also can prevent the corrosion each other between material from occurring and progress.In addition, provide in a kind of gap produced between housing and casing ring, prevent the structure of the cavitation erosion caused because of leakage.And then, the structure of the erosion of the housing (next door) near a kind of casing ring prevented because causing with the impact of " the entrance adverse current " of cavitation erosion generation in impeller when the low discharge of pump is provided.
For solving the means of problem
The first scheme solving described problem is that one prevents corrosive attack from constructing, be housing and impeller opposite site near erosion prevent from constructing, wherein, comprising: housing; Casing ring, is arranged at this housing, and relative with described impeller; Electrical insulation, is located between described housing and casing ring.So, by electrical insulation by electrical insulation between casing ring and housing, do not produce the dissimilar metals contact corrosion between casing ring and housing, suppress the progress of corrosion.And, by electrical insulation, the gap that pressurized liquid can not circulate between casing ring and housing can be made.Therefore, it is possible to prevent from being increased by the cavitate erosion that causes and the leakage between their casing rings of causing and housing.
Alternative plan is preventing in corrosive attack structure of first scheme record, and described electrical insulation comprises epoxy material or silicon based material.By sandwiching the electrical insulation of at least one material comprised in epoxy, silicon system, PTFE material between housing and casing ring, thus when making pump long time running, even if there be the impact, frictional heat the etc. when vibration of pump, slip, this electrical insulation also can not break or depart from, and maintains adaptation.Therefore, it is possible to continue to maintain, pressurized liquid can not be circulated the gap of housing and casing ring, and the electrical contact of casing ring and housing can be prevented, conduct.
Third program be first or two scheme record prevent corrosive attack construct in, be configured with in the interface of described housing and casing ring the O type circle sealed.So, when making pump long time running, due to pump vibration, slide time impact, frictional heat etc. electrically insulating material is broken or from casing ring, housing peel off time, also can utilize O type circle maintain sealing.Therefore, it is possible to continue to maintain, pressurized liquid can not be circulated the gap of housing and casing ring, and the electrical contact of casing ring and housing can be prevented, conduct.
Fourth program be any one of the first ~ tri-scheme record prevent corrosive attack construct in, in the low voltage side of described casing ring, be provided with from the position relative with described impeller to the outer rim extending portion that the radial direction foreign side of pump main shaft extends.So, casing ring is towards the radius outer expandable of suction passage, and adverse current cavitation erosion does not directly abut with housing, protected by casing ring.
5th scheme be fourth program record prevent corrosive attack from constructing, the difference of the angle of the outer rim of the described impeller that the angle of the front end of described outer rim extending portion is relative with the front end with this outer rim is within 10 degree.So, the flowing of liquid becomes smooth-going, reduces the loss because layer difference causes.
6th scheme is preventing in corrosive attack structure of scheme record any one of the first ~ five, and described casing ring is combination 2 parts and forms.So, even if housing and electrical insulation have complicated shape, the casing ring of complicated shape also can be correspondingly set.In addition, for the pump of upper shell and the unseparated form of lower shell body, the casing ring of complicated shape also easily can be set.
7th scheme is a kind of pump, and the corrosive attack that prevents comprising scheme record any one of the first ~ six constructs; Pump main shaft, is supported in rotatable mode by described housing; Impeller, is installed on described pump main shaft; Liquid flow path, is formed at described enclosure interior.
8th scheme is a kind of manufacture method of pump, and described pump comprises housing and impeller,
Comprise described housing,
In the predetermined portion of described housing, electrical insulation is set,
The casing ring of the regulation relative with described impeller is arranged at described housing across described electrically insulating material.
9th scheme is a kind of method for repairing and mending of pump, and described pump comprises housing and impeller,
In the predetermined portion of described housing, electrical insulation is set,
The casing ring of the regulation relative with described impeller is arranged at described housing across described electrically insulating material.
Invention effect
By above each means, such as, can realize following effect:
1) corrosion between casing ring and housing is prevented;
2) leakage between casing ring because above-mentioned corrosion causes and housing is prevented;
3) cavitation erosion because leakage causes is prevented; And
4) cavitation erosion of " entrance adverse current " because producing near Pump Suction Nozzle when low discharge is prevented and erosion near the pump casing ring caused.
Accompanying drawing explanation
Fig. 1 is the overall sectional view of the pump preventing corrosive attack from constructing possessing one embodiment of the present invention.
Fig. 2 is the amplification view of the region A of Fig. 1.
Fig. 3 is the amplification view of another mode of execution of the region A of Fig. 1.
Fig. 4 is the amplification view of another mode of execution of the region A of Fig. 1.
Fig. 5 is the amplification view of another mode of execution of the region A of Fig. 1.
Fig. 6 is the enlarged view of the part B of Fig. 5.
Fig. 7 is the amplification view of the mode of execution of the pump of another form being different from one embodiment of the present invention.
Fig. 8 is the amplification view of another mode of execution of the pump of another form being different from one embodiment of the present invention.
Fig. 9 is the amplification view of another mode of execution of the pump of another form being different from one embodiment of the present invention.
Figure 10 is the overall sectional view of the pump represented in the past.
Figure 11 is the overall sectional view of the pump represented in the past.
Figure 12 is the amplification view of the region A of the pump shown in Figure 10.
Produce the explanatory drawing with cavitation erosion " entrance adverse current " in impeller portion when Figure 13 is low discharge.
Embodiment
Then, with reference to accompanying drawing, one embodiment of the present invention is described.
[overall summary]
Fig. 1 represents that the double suction of present embodiment enters the sectional view of the overall summary of the pump 1 of Scroll-type.Pump 1 comprises: upper shell 3, lower shell body 5, be arranged at the running shaft 7 of the borderline region of two housings 3,5 and be located at the impeller 9 of this running shaft 7.Further, in two housings 3,5, suction side stream 11 and discharge side stream 13 is formed with across impeller 9.Described suction side stream 11 and discharge side stream 13 become fluid flowing path.
[housing]
As mentioned above, the pump 1 of present embodiment enters turbine pump from the double suction of the form of both sides suction liquid centered by discharge side stream 13.Therefore, in the inside of housing 3,5, be provided with the next door 15 suction side stream 11 and discharge side stream 13 separated.One of present embodiment is characterised in that, the end in the next door 15 of this housing 3,5 and the structure of the near sites of relative with impeller 9 (slip).In the drawings, this opposite site is depicted as region A.
[running shaft]
Running shaft 7 engaging of pump 1 has not shown electric motor prime movers.By the driving force of this prime mover, the impeller 9 being arranged at running shaft 7 rotates.In the pump 1 of present embodiment, running shaft 7 is arranged along substantially horizontal.Therefore, impeller 9 rotates along the vertical surface of crosscut running shaft 7.But the running shaft of the substantially horizontal of present embodiment is only an example, can arrange by angle direction vertically or in addition.Running shaft 7 is held between upper shell 3 and lower shell body 5 via bearing 7a.The position being provided with this bearing 7a is the suction side stream 11 of pump inside and the border of external environment condition substantially.Therefore, be provided with seal construction (diagram slightly) at bearing 7a, escape to outside to prevent the liquid in suction side stream 11.
[impeller]
Impeller 9 rotates along with the rotation of running shaft 7, centered by discharge side stream 13, suck liquid from the suction side stream 11 of both sides.The inflow part 9a of impeller 9 is formed near running shaft 7, but suction side stream 11 is formed into than above-mentioned inflow part 9a by outside radial direction.Therefore, at suction side stream 11, in radial direction, flow into the inflow part 9a of impeller 9 to liquid stream.The rotation of impeller 9 can be given to the fluid in internal flow as centrifugal force.Kinetic energy is endowed by this centrifugal force.Thus, result, the rotation of impeller 9 can be converted into pressure energy and kinetic energy.Thus, the pressure of discharge side stream 13 becomes pressure higher than the pressure of suction side stream 11 comparatively speaking.In order to keep this pressure, a part for housing is arranged as next door 15, the suction side stream 11 of low voltage side and on high-tension side discharge side stream 13 to be separated.
In the end in the next door 15 of this housing 3,5 and the position of relative with impeller 9 (slip) (the region A of Fig. 1), be provided with casing ring 19 in the next door 15 of housing, be provided with impeller ring 10 at impeller 9.Describe in detail about the explanation of this point by the enlarged view shown in Fig. 2 ~ Fig. 5.It should be noted that, self-evident, all there is the structure identical with region A in the part relative to running shaft 7 symmetry in figure with the part relative to centre line L symmetry.
[casing ring]
As shown in Figure 2, in the pump of present embodiment, about impeller 9 and impeller ring 10, roughly the same with known structure.And the structure of case side is different from pump in the past.That is, be characterised in that: between the end in the next door 15 of casing ring 19 and housing, be provided with electrical insulation 17A.The electrical insulation 17A of present embodiment is semi-circular shape, fills to distinguish closely sealed state with casing ring 19 and next door 15.So, electrical insulation 17A and casing ring 19 and next door 15 closely sealed, therefore can not form gap between casing ring 19 and next door 15, leakage can not occur, also can prevent the electrical contact of the two.
Electrical insulation 17A can use the resin materials such as insulating film, insulating coating, insulating properties Bond.But also fiber-reinforced plastic, particle reinforced plastics can be used.And, except resin material, can also be use the low-melting glass, pottery system Bond etc. with insulating properties.But, need, for the vibration, impact, temperature variation etc. caused by long pump running, to keep these functions of maintenance of electrical insulating property maintenance, sealing maintenance, dimensional accuracy.Therefore, as the material being suitable for these and requiring, the preferably electrically insulating material of epoxy, silicon system or PTFE system.Also have composition when these materials use in water hardly flow out in water or absorb, therefore long-time use also deterioration hardly.
When the electrically insulating material of epoxy or silicon system is aqueous or gelatinous coatings, insulating properties Bond, excellent to the adhesive quality (compatibility) of metal covering.Therefore, electrically insulating material is coated the next door 15 of housing or at least one party of casing ring 19, and their coating surface is involutory as opposing side, make electrically insulating material expand with the involutory surface of casing ring 19 in the next door 15 of housing thus, form the membranaceous layer of electrically insulating material between.This membranaceous layer becomes the electrical insulation 17A of present embodiment.This membranaceous layer, to a certain degree to solidify gradually, becomes solid shape.Dhering strength, the breakdown strength of the membranaceous layer of solid shape are all high.Therefore, when making pump long time running, even if having the vibration of pump, an impact, frictional heat etc. when sliding, this electrical insulation 17A also can not breakaway, maintains adaptation.Make pressurized fluid can not by between the next door 15 of housing and casing ring 19 therefore, it is possible to continue to maintain, and also can prevent the electrical contact in casing ring 19 and next door 15, conduct.
In addition, if electrically insulating material is silicon system or PTFE system, then preferably make between the membranaceous involutory surface being clipped in next door 15 and casing ring 19.Silicon system (PTFE system) even if solidification also not inharmonious elasticity, as long as therefore the surface roughness of metal covering is little, just can be closely sealed with metal covering.In addition, if next door 15 is standardized with the shape of the involutory surface of casing ring 19, then the parts by having prepared silicon mesentery in advance shaping, then the operation sandwiched between next door 15 and casing ring 19 also becomes high efficiency.In this, in the coating operations of coatings, insulating properties Bond, there will not be this situation of coating weight heterogeneity easily caused.In addition, the scope of the filling thickness of electrically insulating material preferably such as 0.005mm ~ 2mm, if but more than 0.05mm, adopt better membranaceous, if less than 0.05mm time; be coated with coatings, insulating properties Bond be better.
It should be noted that, in order to ensure the adaptation with next door 15 and casing ring 19, the sectional shape of electrical insulation 17A is rectangular wavy.So, even if when counter septum 15, casing ring 19 are applied with impact etc., electrically insulating material also can be prevented from next door 15 stripping such as grade.But this sectional shape is only an example, and the present invention is not limited thereto certainly.
Fig. 3 is the figure representing the second mode of execution.This mode of execution is that the corrosive attack that prevents of the O type circle being also provided with electrical insulating property except described electrical insulation 17 constructs.That is, be formed with O type ring recess 23a at the outer circumferential face of casing ring 19, O type circle 23b embeds this O type ring recess 23a.Consider when making pump long time running, due to pump vibration, slide time impact, frictional heat etc., electrically insulating material 17B can break or peel off from casing ring 19, housing 15.In this case, sealing can be maintained by O type circle.Therefore, even if be formed with gap between casing ring 19 and next door 15, also can lasting seals to make liquid not by this gap.Further, can strengthen further to make casing ring 19 electrical contact not occur with the next door 15 of housing.
When using the mode of execution of this O type circle, O type circle is born and is maintained sealing in case leak-stopping liquid.Therefore, the electrical insulation 17B between the involutory surface sandwiching casing ring 19 and next door 15, so highland does not require the adaptation with involutory surface.But, when using O type circle, in order to ensure certain above sealing, by O type circle self by premised on conquassation.In this case, before and after the O type circle being fulcrum with O type circle (being the left and right of O type circle in Fig. 3), casing ring 19 abuts pressure heterogeneity with next door 15.Therefore, electrical insulation 17 between the involutory surface sandwiching casing ring 19 and next door 15, preferably make and be shaped to the silicon system of 0.05mm ~ 10mm left and right thickness or the parts of PTFE system and embed, not contact with next door 15 to make casing ring 19 at all and the abutting pressure of the involutory surface putting on them can be born.
Fig. 4 represents the 3rd mode of execution.In this embodiment, the corrosive attack that prevents outside the radial direction that the outer rim showing low pressure (the suction side stream 11) side of casing ring 19 extends to running shaft constructs.Below, extension is called outer rim extending portion 19A.The outer rim extending portion 19A of the low voltage side of casing ring 19 is with the next door 15 of wider scope covering shell.So, even if produce the entrance adverse current with cavitation erosion from impeller 9 to suction side stream 11 when the low discharge running of pump, casing ring 19 also can protect next door 15, therefore can prevent the progress corroded.
About outer rim extending portion 19A to about the extension outside the radial direction of running shaft, be sufficient with the diameter of about 1.5 of the diameter of the inflow part 9a of impeller 9 times extension.In the present embodiment, between outer rim extending portion 19A and next door 15, also fill the electrical insulation 17C of predetermined thickness.By forming such outer rim extending portion 19A; namely the metal that use resistant to corrosion is strong thus, such as cast stainless steel are formed, with general metal, such as cast iron formation housing (next door 15) more weak than the erosion resisting of cast stainless steel, next door 15 also can be protected to affect from cavitation erosion.It should be noted that, enter turbine volute pump at double suction, have in the pump of suction spiral case, suction passage may not axisymmetric relative to the running shaft of pump, nonaxisymmetrical situation is also a lot, in this case, preferably meet suction passage shape and outer rim extending portion shape is made non-axis symmetry, so that suction passage is connected with outer rim extending portion 19A is smooth-going.
Fig. 5 illustrates the 4th mode of execution.Be that the following corrosive attack that prevents constructs (the region B in figure) in this embodiment: in the outer rim of the low voltage side of casing ring 19, i.e. suction side stream 11 side, the difference towards the inclination of the outer rim towards casing ring 19 side of the inflow part 9a of the inclination of the outer rim of the casing ring 19 of the inflow part 9a side of close impeller 9 and impeller 9 is about within 10 degree.
Fig. 6 is the figure amplified by the region B of Fig. 5.In figure 6, in the low voltage side outer rim of casing ring 19, if be α ' degree towards the tilt angle of the outer rim of the inflow part side of close impeller 9, the tilt angle of the outer rim towards casing ring 19 side of the inflow part of impeller 9 is α degree.At this, by with the mode set angle within making the absolute value of α-α ' be 10 degree, the flowing of liquid becomes smooth and easy thus, reduces the loss because layer difference causes.
Fig. 7 is to being suitable for the example preventing corrosive attack from constructing of present embodiment in the pump of the form of the inflow part 9a of liquid stream inflow impeller 9 in radial direction, representing the figure of its major component.The cross section of the electrical insulation 17E of this mode of execution is L-shaped shape.There is not shown electric motor prime movers in running shaft 7 engaging of pump, by the driving force of this prime mover, impeller 9 is rotated.The liquid flowing through internal flow path through the suction side stream 11 side cover 14 and the next door 15 of housing, from the outside of running shaft 7 such as in radial direction to.Further, as shown in arrow C in figure, the inflow part 9a of impeller 9 is flowed into.
The liquid flowing into impeller 9 from suction side stream 11 accepts the rotation energy of impeller 9, is converted to the liquid that improve pressure energy and kinetic energy by centrifugal force.The pressure of discharge side stream 13 become relative to for the pressure higher than suction side stream 11, in order to keep this pressure, suction side stream 11 and discharge side stream 13 are separated by the next door 15 of housing section.It should be noted that, in the pump of present embodiment, running shaft 7 is arranged in the horizontal direction, and therefore impeller 9 rotates along the vertical surface of crosscut running shaft 7.But the running shaft of the substantially horizontal of present embodiment is only an example, can arrange by angle direction vertically, in addition.
In the end in the next door 15 of this housing and the position relative with impeller 9, casing ring 19 is located at the next door 15 of housing, and impeller ring 10 is located at impeller 9.Between the end in the next door 15 of casing ring 19 and housing, be provided with electrical insulation 17, this electrical insulation 17E fills in the mode closely sealed with the next door 15 of casing ring 19 and housing.Due to electrical insulation 17E and casing ring 19 and next door 15 closely sealed, therefore between casing ring 19 and next door 15, do not form gap, can anti-fluid leakage, prevent the electrical contact in casing ring 19 and next door 15.
Electrical insulation 17E can use all resin materials such as insulating film, coatings, insulating properties Bond, can also use fiber-reinforced plastic, particle reinforced plastics.And, except resin material, can also be use the low-melting glass, pottery system Bond etc. with insulating properties.But, need, for the vibration, impact, temperature variation etc. caused by long pump running, to keep these functions of maintenance of electrical insulating property maintenance, sealing maintenance, dimensional accuracy.Therefore, as the material being suitable for these and requiring, the preferably electrically insulating material of epoxy, silicon system or PTFE system.Also have composition when these materials use in water hardly flow out in water or absorb, therefore long-time use also deterioration hardly.
When the electrically insulating material of epoxy or silicon system is aqueous or gelatinous coatings, insulating properties Bond, excellent to the adhesive quality (compatibility) of metal covering.Therefore, electrically insulating material is coated one party or the both sides of housing or casing ring, and their coating surface is involutory as opposing side, makes coating mixture expand at the involutory surface of housing and casing ring thus, form the membranaceous layer of electrically insulating material between.This membranaceous layer, to a certain degree to solidify gradually, becomes solid shape.Dhering strength, the breakdown strength of the membranaceous layer of solid shape are all high, and when making pump long time running, even if having the vibration of pump, an impact, frictional heat etc. when sliding, this electrically insulating material also can not breakaway, maintains adaptation.Therefore, between casing ring and housing, do not form gap, can continue to maintain the leakage making liquid does not occur, and also can prevent the electrical contact of casing ring and housing, conduct.
In addition, if electrically insulating material is silicon system or PTFE system, then membranaceous being clipped between housing and the involutory surface of casing ring is preferably made.Silicon system (PTFE system) even if solidification also not inharmonious elasticity, as long as therefore the surface roughness of metal covering is little, just can be closely sealed with involutory surface.In addition, if the shape of the involutory surface of housing and casing ring is standardized, parts then by having prepared silicon mesentery in advance shaping, the operation sandwiched again between housing and casing ring also becomes high efficiency, also there will not be this situation of coating weight heterogeneity easily caused in the coating operations of coatings, insulating properties Bond.In addition, the scope of the filling thickness of electrical insulation 17E preferably such as 0.005mm ~ 2mm, if but more than 0.05mm, adopt better membranaceous, if less than 0.05mm time; be coated with coatings, insulating properties Bond be better.
Fig. 8 is that the corrosive attack that prevents of the O type circle 23b being also provided with electrical insulating property except the electrical insulation 17F shown in Fig. 7 constructs.O type circle 23b is arranged on the O type ring recess 23a being formed at next door 15.When making pump long time running, sometimes because of pump vibration, slide time impact, frictional heat etc., this electrically insulating material 17F breaks or peels off from casing ring 19, housing 15.In this case, maintain sealing owing to passing through O type circle 23b, therefore, it is possible to continue maintenance to make liquid not passage gaps, and strengthen the next door 15 not electrical contact making casing ring 19 and housing further.
The side forming O type ring recess 23a can be casing ring 19 side, also can be housing 15 side.It should be noted that, in this case, the O type circle 23b of electrical insulating property bears maintenance sealing, and therefore electrical insulation 17F does not so highly require the adaptation with involutory surface.But, when using O type circle 23b, by O type circle self by premised on conquassation established amount, the therefore casing ring 19 of (being the left and right of O type circle in figure) and the applying mode heterogeneity of the contact of housing 15 before and after the O type circle being fulcrum with O type circle 23b.Therefore, electrical insulation 17F preferably makes and is shaped to the silicon system of 0.05mm ~ 10mm left and right thickness or the parts of PTFE system and embeds, and not to contact at all and can bear the contact of the involutory surface putting on them to make casing ring 19 with the next door 15 of housing.
Fig. 9 represents that the corrosive attack that prevents that the outer rim of low voltage side, the i.e. side of suction side stream 11 of casing ring 19a extends outside the radial direction of pump shaft constructs.The part of this extension is outer rim extending portion 19A.Casing ring 19 is divided into these two parts of the 1st parts 19a and the 2nd parts 19b.Therefore, as shown in the figure, even if under the engaging profile complicated situation of electrically insulating material 17G, the 1st parts 19a can also be configured in impeller 9 side, at suction side stream 11 side configuration the 2nd parts 19b, by screw 21 by they fixing assemblings.
The above-mentioned corrosive attack that prevents constructs, in the pump (slice etc.) of upper shell and the unseparated form of lower shell body, also can realize the assembling preventing corrosive attack from constructing possessing outer rim extending portion 19A.In addition, next door 15 covers with wider range by the low voltage side of the part 2 19b of casing ring 19.So, even if produce the entrance adverse current with cavitation erosion from impeller 9 to suction side stream 11 when the low discharge running of pump, because part 2 19b protects next door 15, the progress corroded can therefore also be prevented.Even if the part 2 19b of casing ring 19 to be made the strong metal of resistant to corrosion, such as cast stainless steel system; the next door 15 of housing is made general metal, the such as cast iron system more weak than the erosion resisting of the part 2 19b of casing ring 19, also the next door 15 of protective housing can avoid the impact of cavitation erosion.
The corrosive attack that prevents that above explanation is recited as pump constructs.But the present invention also can be defined as the manufacture method of pump.That is, a manufacture method for pump, described pump comprises housing and impeller, has described housing, arranges electrical insulation in the predetermined portion of described housing, and the casing ring of the regulation relative with described impeller is arranged at described housing across described electrically insulating material.It should be noted that, the various characteristic points illustrated in the mode of execution for implementing foregoing invention can combine the manufacture method of this pump and be suitable for.
And the present invention can also orientate the method for repairing and mending of pump as.That is, a method for repairing and mending for pump, described pump comprises housing and impeller, arranges electrical insulation in the predetermined portion of described housing, and the casing ring of the regulation relative with described impeller is arranged at described housing across described electrically insulating material.It should be noted that, this repairing is undertaken after pump transitory decomposition.In addition, the various characteristic points illustrated in the mode of execution for implementing foregoing invention can combine the method for repairing and mending of this pump and be suitable for.
Utilizability in industry
The invention is not restricted to the mode of execution shown in Fig. 1 and Fig. 9, for the pump by transferring liquid pressing, the pump that housing and casing ring (packing ring) are dissimilar metals material, can utilize corrosive attack countermeasure.
Above-mentioned mode of execution can implement to record for the purpose of the present invention by the people with usual knowledge of the technical field of the invention.To those skilled in the art, certainly can obtain the various variation of above-mentioned mode of execution, technical conceive of the present invention also goes for other mode of executions.Thus, the invention is not restricted to described mode of execution, should be interpreted as according to the widest scope by technical conceive as defined in the claims.In addition, the specific item of each invention illustrated in above-mentioned mode of execution is to invent premised on establishment, forms the present invention by independent or combination in any.
The explanation of reference character
1 pump
3 upper shells
5 lower shell bodys
7 running shafts
9 impellers
9a inflow part
10 impeller rings
11 suction side streams
13 discharge side streams
The next door of 15 housings
17A, 17B, 17C, 17D, 17E, 17F, 17G electrical insulation
19 casing rings
19A outer rim extending portion
21 screws
23aO type ring recess
23bO type ring recess
Claims (9)
1. one kind prevents corrosive attack from constructing, be housing and impeller opposite site near erosion prevent from constructing, wherein, comprising:
Housing; Casing ring, is arranged at this housing, and relative with described impeller; Electrical insulation, is located between described housing and casing ring.
2. the corrosive attack that prevents according to claim 1 constructs, wherein,
Described electrical insulation comprises at least one material in epoxy, silicon system, PTFE based material.
3. the corrosive attack that prevents according to claim 1 and 2 constructs, wherein,
The interface of described housing and casing ring is configured with the O type circle sealed.
4. the corrosive attack that prevents according to any one of claims 1 to 3 constructs, wherein,
In the low voltage side of described casing ring, be provided with from the position relative with described impeller to the outer rim extending portion that the radial direction foreign side of pump main shaft extends.
5. the corrosive attack that prevents according to claim 4 constructs, wherein,
The difference of the angle of the outer rim of the described impeller that the angle of the front end of described outer rim extending portion is relative with the front end with this outer rim is within 10 degree.
6. the corrosive attack that prevents according to any one of Claims 1 to 5 constructs, wherein,
Described casing ring is combination 2 parts and forms.
7. a pump, comprising: the corrosive attack that prevents according to any one of claim 1 ~ 6 constructs; Pump main shaft, is supported in rotatable mode by described housing; Impeller, is installed on described pump main shaft; Liquid flow path, is formed at described enclosure interior.
8. a manufacture method for pump, described pump comprises housing and impeller,
Comprise described housing,
In the predetermined portion of described housing, electrical insulation is set,
The casing ring of the regulation relative with described impeller is arranged at described housing across described electrically insulating material.
9. a method for repairing and mending for pump, described pump comprises housing and impeller,
In the predetermined portion of described housing, electrical insulation is set,
The casing ring of the regulation relative with described impeller is arranged at described housing across described electrically insulating material.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-135228 | 2013-06-27 | ||
| JP2013135228 | 2013-06-27 | ||
| PCT/JP2014/065291 WO2014208327A1 (en) | 2013-06-27 | 2014-06-10 | Corrosion and erosion preventing structure and pump comprising same, and pump manufacturing method and repairing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105339674A true CN105339674A (en) | 2016-02-17 |
Family
ID=52141672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480035966.7A Pending CN105339674A (en) | 2013-06-27 | 2014-06-10 | Corrosion and erosion preventing structure and pump comprising same, and pump manufacturing method and repairing method |
Country Status (4)
| Country | Link |
|---|---|
| JP (2) | JPWO2014208327A1 (en) |
| CN (1) | CN105339674A (en) |
| SA (1) | SA515370324B1 (en) |
| WO (1) | WO2014208327A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108468657A (en) * | 2018-04-09 | 2018-08-31 | 捷达消防科技（苏州）股份有限公司 | The fire-fighting pump configuration of used in fire-fighting |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7262928B2 (en) * | 2018-04-19 | 2023-04-24 | 株式会社荏原製作所 | How to repair the casing of a pump with a liner ring |
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- 2014-06-10 CN CN201480035966.7A patent/CN105339674A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| SA515370324B1 (en) | 2020-12-06 |
| JPWO2014208327A1 (en) | 2017-02-23 |
| WO2014208327A1 (en) | 2014-12-31 |
| JP2018040363A (en) | 2018-03-15 |
| JP6469811B2 (en) | 2019-02-13 |
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