CN103069167A

CN103069167A - Pump cavitation device

Info

Publication number: CN103069167A
Application number: CN2011800396944A
Authority: CN
Inventors: J.H.伯恩
Original assignee: SPM Flow Control Inc
Current assignee: SPM Oil and Gas Inc
Priority date: 2010-06-17
Filing date: 2011-06-17
Publication date: 2013-04-24
Also published as: WO2011160069A1; CA2802712A1; US20110308967A1

Abstract

A sacrificial body mitigates cavitation damage to components within a pump. The sacrificial body is mounted in the pump so that flowing fluid passes over the sacrificial body, which causes the sacrificial body to shed electrons into the flowing fluid in the vicinity of the cavitation. The excess electrons tend to suppress hydrogen ions from releasing, which can mitigate cavitation. The sacrificial body is formed of a material having less resistance to corrosion due to the flowing fluid than the components of the pump. Needles are attached to the sacrificial body for immersion in the flowing fluid to facilitate the release of the electrons for the sacrificial body.

Description

Mercury vapour erosion device

The cross reference of related application

The application's requirement is filed in the preference of the 61/355th, No. 878 temporary patent application of sequence number on June 17th, 2010.

Technical field

This disclosure relate generally to pump, and relate in particular to and alleviate because the spot corrosion that causes of cavitation and the sacrificial body of corrosion.

Background technique

Cavitation in pump pressurizing unit causes assembly because erosions/corrosion and resulting spot corrosion and too early damage.Spot corrosion has caused a plurality of problems: seal area leaks, loses the pressure integrity, and perhaps catastrophis failure loses the pressure integrity because the pressure chamber fracture causes happening suddenly, and it begins the pressure bearing wall that pump chamber is passed in also bamboo telegraph from cavitation corrosion spot corrosion.Cavitation usually from measurable to the place, near the edge such as, but not limited to, sealing surface, sharply the descend zone of turbulization of pressure, perhaps on the surface of metal granule and the precise and tiny discontinuous place of synthetic property.

Cavitation occurs when pressure descends rapidly in turbulent region, especially begins to locate or at the trailing edge place of vane wheel type centrifugal pump in the suction stroke of reciprocating pump.Small bubble forms and breaking of bubble can reach sufficiently high boundary speed and metal attack is fallen, and causes spot corrosion.In the formation of these bubbles and rupture process chemical change occuring also, because from the liquid state to the gaseous state, and return liquid rapidly phase from gaseous state and change, has spread hydrionic release.These hydrogen ions have corrosive effect for the structure of molecule of metal, cause the small metal particles segregation and enter liquid stream, play the effect that the spot corrosion process is further accelerated.These hydrogen ions cause forming the hydrogen embrittlement fracture, spread in each pump pressure stroke procedure of reciprocating pump.Final this fracture begins to penetrate into the pressure bearing wall, and causes rapidly the damage of construction of pressure vessel.

In the application with a large amount of liquid of high speed pump pressure, because the maintenance cost that cavitation erosion/corrosion causes may account for sizable part of operating cost.Owing in many industry, needing high pressure and high flow rate, be unpractical so eliminate cavitation.A kind of industry that will bear expensive " article of consumption " is well pressure break industry (the well service frac industry).Because government is restricted for weight and the width of the vehicle that allows to travel in the expressway, when employed fracturing unit truck is fabricated at the requirement that still can reach pump pressure and flow in the industry of well pressure break as far as possible gently and little.Be designed to as far as possible gently, the fluid end of pump relevant with the down-hole service equipment and internal component thereof may be worn because of erosion and corrosion and damage very soon.When spot corrosion occurring in the pump chamber at fluid end, stressedly concentrate on spot corrosion place, as a result corrosion fracture begins and the fluid end that causes bearing pressure damages.Change fluid end and be one of the highest maintenance expenses of well pressure break business.Obtaining more long-life fluid end and more long-life valve, filling and filler is the important goal of this industry.People usually make great efforts to reduce cavitation or selection can be resisted the material of cavitation erosion and corrosion more.Valve, filling and filler also can be owing to erosion and corrosions and are damaged rapidly, will speed up this damage when cavitation occurring.The speed of pump slowed down can eliminate this problem, but because commercial competitiveness, and for the demand of operation with high pressure more, these pumps are running up, and cavitation is inevitable in this speed.

The entrance of pump is carried out supercharging can reduce cavitation.Adopting suitably, the suction shaking device of size can reduce cavitation.But in industry, realize these schemes, and because cavitation erosion/corrosion has still produced expensive maintenance cost, thereby to meeting the longer this demand of the further equipment that reduces of operation cost that makes of life-span is still being continued.

Summary of the invention

First aspect, disclosed and made the embodiment who the cavitation of pump inner assembly is damaged the method that reduces, it comprises sacrificial body is installed in the pump, and operating pumps is to cause occuring at assembly the speed pump pressure liquid stream of at least some cavitations, and the liquid that wherein is subject to pump pressure flows by sacrificial body with the electronics that comes off in the flow stream of contiguous cavitation.Owing to comparing with the assembly that does not have sacrificial body, the cavitation infringement of assembly with sacrificial member is reduced, sacrificial member has advantageously prolonged the operating life of assembly, has surmounted the assembly that sacrificial body wherein is not installed.

In certain embodiments, sacrificial body comprises the material that is easier to be corroded than pump inner assembly.

In other embodiment again, in use, operating procedure causes hydrogen ion to discharge from the assembly in the pump, has alleviated hydrionic release by the electronics that comes off from sacrificial body.

In certain embodiments, the method comprises at least one pin is attached on the sacrificial body, to promote that electronics comes off from sacrificial body.

In other embodiments, pin in use points to the downstream.

In certain embodiments, pin is metal by what compare and be difficult for being dissoluted with sacrificial body.

In certain embodiments, the method comprises that further the upstream portion with sacrificial body is installed to the step in the pump, and this sacrificial body has the profile that the liquid stream turbulent flow that flows through sacrificial body is strengthened.

In certain embodiments, pump be positioned such that any part of pump is not dipped into will be undertaken by this pump in the liquid stream of pump pressure.

In certain embodiments, sacrificial body is by metal from the group that comprises zinc, aluminium, magnesium or its alloy one or more.

In certain embodiments, produce cavitation because sacrificial body is installed to the turbulent flow that produces in the assembly on the surface of sacrificial body, and do not allow to form the cavitation bubble at assembly.The sacrificial body wearing and tearing of having a mind to produce the amount of cavitation bubble and causing with overcome in the cavitation process steam state liquefy and liquidly change the energy correlation that the back-steam attitude consumes.The hydrionic release of energy demand that phase is changed, a kind of corrosion phenomenon that Here it is.Sacrificial body is to be made by the material that the steel than liquid stream chamber are easier to discharge ion, and this corrodes the spot corrosion guiding to sacrificial body with harmful cavitation.

In another embodiment again, this assembly comprises liquid stream end block, the plunger piston borehole that leads to the chamber with chamber, leads to the suction valve port of chamber, and the expulsion valve port that passes through from the chamber.

In certain embodiments, the method comprise sacrificial body is installed to indoor.

In certain embodiments, the method comprises sacrificial body is fixedly secured in the plunger piston borehole that surrounds plunger.

In certain embodiments, the method comprises sacrificial body is installed on the suction valve, moves with it.

In certain embodiments, the method comprises sacrificial body is installed in the suction valve port of the upstream of suction valve.

In another embodiment, assembly is included in the plunger in the plunger piston borehole.

In another embodiment again, installation steps comprise sacrificial body are installed on the plunger.

In certain embodiments, assembly comprises the housing that wherein has rotatable impeller.

In certain embodiments, the method comprises sacrificial body is installed in the housing peripheral adjacent with impeller.

In certain embodiments, the method comprises sacrificial body is installed on the impeller, is used for playing rotation with one.

Second aspect has disclosed the embodiment of pump, and it has the liquid stream end block, the plunger piston borehole that leads to the chamber that comprise the chamber, leads to the suction valve port of chamber, and the expulsion valve port that passes through from the chamber.Suction and expulsion valve are mounted for reciprocal within suction valve port and expulsion valve port respectively.Sacrificial body is installed in the liquid stream end block, is used in use being immersed in liquid stream along with the stroke of plunger.Sacrificial body is to be made by the material that is difficult for the tolerance corrosion of comparing with liquid stream end block.This embodiment has advantageously provided a kind of pump, and it has the cavitation target area, thereby alleviates the cavitation on the liquid stream end block, and this has prolonged the operating life of liquid stream end block.And, can be replaced at liquid stream end block life period as the sacrificial member of cavitation target.

In certain embodiments, at least one pin is installed on the sacrificial body, and this pin in use is dipped in the mobile liquid stream and points to the direction in downstream.

In certain embodiments, this pin be by compare with sacrificial body more can tolerate owing to liquid stream at pin the metal of the corrosion that produces that flow.

In certain embodiments, place the profile that is configured to strengthen turbulent flow in the upstream portion of sacrificial body.

In certain embodiments, sacrificial body is by making from one or more materials in the group that comprises zinc, aluminium, magnesium or its alloy.

In certain embodiments, sacrificial body comprises the sleeve that is fixedly mounted in the plunger plunger piston borehole on every side.

In certain embodiments, sacrificial body is mounted to the front end of plunger, is used for moving with it.

In certain embodiments, sacrificial body is mounted to suction valve, is used for moving with it.

In certain embodiments, sacrificial body is installed in the suction valve port of suction valve upstream.

The third aspect has disclosed the embodiment of pump, and it comprises housing, is installed in the rotatable impeller in the housing, and is installed in the sacrificial body in the housing, is used for being dipped in the liquid stream along with the rotation of using process impeller.Sacrificial body does not tolerate the material of the corrosion that occurs owing to liquid stream and makes by comparing with impeller and housing.

In certain embodiments, to be installed in inside and the impeller periphery of housing adjacent for sacrificial body.

In certain embodiments, sacrificial body is installed on the impeller, is used for playing rotation with one.

Fourth aspect, disclosed be used for making since cavitation to the embodiment of the device of the damage sluggishness of pump, this device comprises sacrificial body, it is suitable for being installed in the pump, come off when being selected in immersing the liquid that the flows stream of the pump metal of electronics of this sacrificial body is made.At least one pin is installed on the sacrificial body, and this pin is made by compare the metal that more can tolerate the corrosion that occurs owing to the liquid stream that flows with sacrificial body.

In certain embodiments, sacrificial body comprises sleeve, and this sleeve has the profile that forms on the outer surface the turbulent flow enhancing that makes the liquid stream that flows at sleeve, and this profile is suitable for being positioned at the upstream of at least one pin.

In certain embodiments, sacrificial body comprises dish, and it has circular periphery and is suitable for being installed to the inner end of the plunger of pump.The end face of dish is equipped with pin, and this pin is aimed at the axle of dish.

In certain embodiments, this pin is hidden in the hole that forms on the end face of dish.The part that fluid port extends through dish arrives the bottom in hole so that liquid stream is directed to pin section.

In certain embodiments, sacrificial body comprises the ring of the downstream end face of the suction valve that is suitable for being installed to pump.This pin is installed on the end face of ring and aims at the axle of ring.

In certain embodiments, the side that flow port will encircle is led to the end face adjacent with pin of ring, and this flow port is positioned at the outside of the internal diameter of ring.

In certain embodiments, sacrificial body is installed on the support rod, and this support rod is suitable for being installed to the inside of pump.

In certain embodiments, sacrificial body is that material in the group of the self-contained zinc of origin, aluminium, magnesium or its alloy is made.

After by reference to the accompanying drawings, according to following detailed explanation, other aspect, feature, and advantage will become apparent, these accompanying drawings are parts of this disclosure, and by example the principle that discloses have been described.

Description of drawings

Accompanying drawing helps the understanding to various embodiments.

Fig. 1 has the sectional view that splits the fluid end of press pump according to the piston type of the cavitation device of this disclosure;

Fig. 2 is the sectional view of the expansion of cavitation device part among Fig. 1;

Fig. 3 is the sectional view of piston type fluid end of pump with second embodiment of cavitation device;

Fig. 4 is the sectional view of expansion of the part of the cavitation device among Fig. 3;

Fig. 5 is the sectional view of piston type fluid end of pump with another embodiment of cavitation device;

Fig. 6 is the sectional view of expansion of the part of the cavitation device among Fig. 5;

Fig. 7 is the sectional view of piston type fluid end of pump with another embodiment of cavitation device;

Fig. 8 is the sectional view of expansion of the part of the cavitation device among Fig. 7;

Fig. 9 illustrates the schematic diagram that has according to the centrifugal pump of the cavitation device of this disclosure;

Figure 10 is the schematic diagram that has according to another embodiment's of the cavitation device of this disclosure centrifugal pump.

Embodiment

With reference to figure 1, fluid end 11 illustrates an a kind of part usually splitting employed reciprocating pump in the pressure industry in the down-hole.Fluid end 11 is the parts that typically are installed to the surperficial installation pump on the truck.Fluid end 11 is not submerged in will be by in the liquid of the pump pressure stream; But oil outlet tube (flowline) thus leading to liquid stream 11 makes it by pump pressure to transport liquid stream; Fluid end 11 comprises the liquid stream end block 13 with chamber 15.Plunger piston borehole 17 intersects in a side and chamber 15.Discharge valve port or path 19 15 are drawn from the chamber; Aspirator on ingress port or path 21 15 is drawn from the chamber in substantially opposite direction.In this embodiment, it is coaxial discharging and sucking

path

19 and 21, and vertical with plunger piston borehole 17, but they relative to each other with respect to plunger piston borehole 17 can become different angles.

Expulsion valve 20 is shown as and places drain passageway 19 places.Expulsion valve 20 is spring-biased to closing position, and opens when the pressure in chamber 15 is sufficiently high.Suction valve 22 is placed on and sucks in the path 21.This suction valve 22 is biased to closing position, and the pressure difference between will the pressure in suction pressure and chamber 15 opens when being enough to overcome the bias force of spring, and allows liquid to flow to enter the room 15.

Flange coupling connector 23 is fixed to the liquid stream end block 13 on the side around the plunger piston borehole 17.Plunger 25 utilizes the normal power supplies (not shown) also to carry out stroke movement between entry position and the interior drain position outside at flange coupling connector 23 and plunger piston borehole 17 interior to-and-fro motion.Sealing or the accessory 27 of packing place flange coupling connector 23, and the external diameter of engage pistons 25 hermetically.Packing nut (packing nut) 29 is fixed to the internal thread at the place, outer end of flange coupling connector 23.Encapsulation nut 29 preloads filler (packing) 27 and thinks that plunger 25 provides sealing when rotating.Under normal circumstances, liquid stream end block 13 will have chamber 15, plunger 25, and in valve sets 20 and 22 three or five.

The device that illustrates is used for the impact of retardance cavitation, and it comprises the sacrificial body of sleeve 31 forms, and it is around plunger 25 and be fixedly mounted in the bore hole of flange coupling connector 23 and in the plunger piston borehole 17.As shown in Figure 2, the internal diameter of sleeve 31 has the profile that the turbulent flow of making strengthens, and this turbulent flow strengthens profile and has other shape that one or more grooves 35 maybe can be upset the laminar flow of liquid stream.In this example, groove 35 is spiral helicine.The internal diameter of sleeve 31 optionally can with the external diameter sliding contact of plunger 25.In this example, sleeve 31 has outward flange 33 in its outer end, and the shoulder in itself and the flange coupling connector 23 closely cooperates.The inner end of sleeve 31 or wheel rim 40 can flush substantially with the inwall of chamber 15.Therefore, when plunger 25 was in the full power impact position, it will be just in time in the position shown in Fig. 1.The inner end of plunger 25 will more be firmly got than the wheel rim 40 of sleeve 31 and be projected in the chamber.

Still with reference to figure 2, bypass port 37 extends through the sidewall of sleeve 31.The inner end of each bypass port 37 intersects with a circle of helical groove 35.This bypass port 38 circumferentially is spaced apart around sleeve 31 and along the part of sleeve 31 length.In this embodiment, the external diameter of sleeve 31 is less than the internal diameter of plunger piston borehole 17, produces the endless belt (annulus) around sleeve 31.A part of liquid stream that this layout causes being promoted by plunger 25 is flowing through bypass port 37 and is entering in the external diameter and the endless belt between the plunger piston borehole 17 of sleeve 31 during inner stroke or power stroke.Turbulent flow on the external diameter of sleeve 31 produces profile 38 also can comprise helical groove or other shape.This helical groove 35 and port 37 strengthen turbulent flow and cause occuring cavitation in the power stroke process in endless belt.

Sacrificial body comprises that a plurality of pin 39(only show one), it is installed into the wheel rim 40 around sleeve 31.The turbulent flow liquid stream that flows out endless belt flows around them in the process of power stroke.Each pin 39 has sharp-pointed tip, and inwardly or downstream is projected into (Fig. 1) the chamber 15 from wheel rim 40.Each pin 39 can be parallel to the axis of plunger piston borehole 17.

Sleeve 31 the serve as reasons material with the characteristic that is easy to discharge electronics or the sacrificial body that multiple material is made.This material can be for example zinc, aluminium, magnesium, or the alloy of these metals.This material is the inexpensive metal of comparing with the liquid stream end block 13 of being made by Steel Alloy.The material of sleeve 31 is compared with the Steel Alloy of liquid stream end block 13 has lower electrochemical potential, so sleeve 31 will easilier be dissoluted because of the liquid that flows through from it stream.

Pin 39 can be by making than the more corrosion resistant metal of the metal of sleeve 31, with corrosion and the spot corrosion that alleviates pin.Therefore, pin 39 will be by comparing the metal with higher electrochemical potential with sleeve 31.For example, pin 39 can be made by stainless steel.The metal of each pin 39 base portion will contact with the Metal Phase of sleeve, so that the effect that pin 39 and sleeve 31 come off or send electronics playing from sleeve 31 to the liquid stream that flows through pin 39.

As mentioned, sleeve 31 can have the profile that strengthens cavitation, and this has caused the formation of steam bubble and has broken, if not suppressed, may cause the chemical change of steel assembly, especially hydrionic release.Hydrogen ion has the corrosion effect to the structure of molecule of the metal of liquid stream end block 13, and this causes small metal particles to come off and enters liquid stream a fluid stream.The release of this metal granule causes spot corrosion.Discharge the negative charge electronics from pin 39 and reduced hydrionic formation, hydrogen ion is electronegative equally.Owing on sleeve pipe 31 cavitation, erosion and corrosion will occur; But sleeve pipe is intended to be article of consumption.Sleeve pipe 31 is not connected to any voltage potential, but discharges electronics because turbulent flow liquid stream flows through from it.

With reference to figure 3 and Fig. 4, in this second embodiment, fluid end 41 has discharge and the

suction valve

43,45 with routine the same in the first embodiment.Fluid end 41 has chamber 47, and plunger 49 extends internally and passes flange coupling connector 51.In this embodiment, dish 53 is installed on the inner 57 of plunger 49, plays the effect of sacrificial body.With reference to figure 4, in plunger inner end 57, be formed with coaxial cylindrical recessed 55.Dish 53 is by being fixed in recessed 55 such as snap ring 59.Be formed with small cylindrical hole 61 in the end face of dish 53, each hole 61 has the inner end (Fig. 4) of the opening that is exposed to chamber 47, and the bottom of sealing.Pin 63 is fixed on metal and the metal contact place of each 61 bottom, hole.In this example, the not outstanding end face that surpasses dish 53 of pin 63, but stashed fully.Bypass port 65 extends to one of them hole 61 from the external diameter of plunger 49.The intersection in bypass port 65 and hole 61 is near the bottom in hole 61.Although in the bypass port 65 only is shown, preferably other bypass port 65 also are connected to other hole 61 external diameter of plunger 49.

When plunger 49 during to inner stroke, liquid stream will flow into each hole 61, round one of them pin 61, then by one of them bypass port 65, arrive the external diameter of plunger 49.Vortex flow causes at it cavitation occuring when flowing around the pin 63.Pin 63 can adopt and material identical in the first embodiment with dish 53 assembly, with in order to promote that with identical purpose discussed above electronics comes off.

With reference to figure 5, fluid end 67 be configured to the first two embodiment in the same substantially.Fluid end 67 has chamber 69, and discharge and suction valve 71,73.Plunger extends into from a side and enters the room 69.Suction valve 73 is described in further detail.The main body of suction valve 73 has Sealing 77, and it can have conventional design.Suction valve 73 is subject to spring 79 biasings, thereby forces Sealing 77 and valve seat 81 sealing engagement.Valve seat 81 is for having the cylindrical member of sealing surfaces within it edge or the wheel rim.With reference to figure 6, the main body of valve 73 has external diameter 83 and inner end or upper end portion 85.Junction at inner end 85 and external diameter 83 forms annular recess 87.The sacrificial body that comprises ring 89 is installed in recessed 87.Ring 89 external diameter flushes with external diameter 83, and encircles 89 inner end and flush with valve body inner end 85.

Ring 89 has a plurality of pin 91(that are installed to its end face and only illustrates one).These pins 91 extend internally, and are parallel with the axle of seat ring 81.Pin 91 is the outstanding inner end 85 that surpasses suction valve 73 inwardly.Ring 89 can be made for electron emission by the material identical with the first embodiment with pin 91.In order to help near generation cavitation pin 91, a plurality of bypass port 93(only illustrate one) extend obliquely from encircling 89 inboard.Each bypass port 93 also extends to valve body external diameter 83, so that bypass port 93 is positioned at the outside of ring 89 inboards, and plays the effect that makes valve external diameter 83 and upper end portion 85 liquid flowing connections.Along with valve 73 to valve seat 81 strokes and away from valve seat 81 strokes, liquid stream will be forced to pass bypass port 93 and around pin 91.Preferably in the bypass port 93 will be disposed adjacent to each pin 91.

Another embodiment has been described in Fig. 7 and Fig. 8.Fluid end 95 has and identical in other embodiments essential structure.Fluid end 95 has chamber 97, discharge and suction valve 99,101 and plunger 103.In this example, sacrificial body 105 is placed near the bottom or underpart of suction valve 101.Sacrificial body 105 is electronic emission materials that are installed to crooked support rod 107, and this support rod 107 can be bent into the location status of expectation.This support rod 107 has the section of extending axially, and it is positioned at sacrificial body 105 in the seat ring 109.In this example, support rod 108 is bent to a right angle, and has the plug-in unit 111 of installation in its outer end.This plug-in unit 111 is fixed to flange port 113, and it extends through inlet fluid end 114.Plug-in unit 111 sealing flange port ones 13 are to prevent that liquid stream is by port one 13.Sacrificial body 105 is spaced apart with the point of contact of the arbitrary portion of suction valve 101.

As shown in Figure 8, sacrificial body 105 has one or more pin 115 facing up.Be subject to the to flow through invasion and attack of liquid stream of bypass port 117 of these pins 115 are wherein extended bypass port 117 and are passed sacrificial body 105.In this embodiment, at least two pins 115 are installed to sacrificial body 105.A part that upwards flows to the liquid stream of suction valve 101 will turn to passes bypass path 117, thereby flows through pin 115.As previously mentioned, sacrificial body 105 is by being good at coming off the metal of electronics.Electronics will suppress hydrogen ion and form, otherwise hydrionic formation may cause the main body of valve seat 109 and the spot corrosion of valve 101.

Can be combined with other embodiment to the embodiment for reciprocating pump illustrated in fig. 8 at least some at Fig. 1.For example, the embodiment of the spot corrosion of dealing with valve shown in Fig. 5 to Fig. 8 can with a combination in the device shown in Fig. 1 to Fig. 4.Similarly, avoid the layout of the spot corrosion of valve can be when being inhaled into valve and utilizing identical mode be discharged from valve and adopt.

With reference to figure 9, dissimilar pump 119 has been described.Pump 119 is a kind of centrifugal pumps with housing 121 of band outlet 123.Entrance is not shown.One or more impellers 125 are installed in the housing 121, and with respect to these housing 121 rotations.Each impeller 125 has wheel hub 127, and impeller 125 rotates around wheel hub 127 via the axle (not shown).Each impeller 125 has a plurality of blades 129, and it is from wheel hub 127 to inverted position turn.Comprise be used to the path that enters near the liquid stream the wheel hub 127 at the interval between each impeller 129.Liquid flows to and to flow and discharge by outlet 123 outward.

In this embodiment, a plurality of sacrificial body 131 are fixedly mounted in the periphery of inner wall of housing 121.These sacrificial body 131 comprise pin 135, and it is downstream-directed substantially,, generate hydrogen ion otherwise may generate at the inwall place of contiguous housing 121 so that the liquid stream that flows through will be assembled electronics to stop hydrogen ion.In this example, sacrificial body 131 has at the assembly department shown in housing 121 outsides.Assembly department can be placed within the inside.And the inwall of housing 121 can comprise the part of the diffuser of each impeller 125.As in other embodiments, sacrificial body 131 forms to the come off sacrifice metal of electronics of liquid stream fluid by being used for.

In the embodiment of Figure 10, centrifugal pump 137 is also schematically shown comprises housing 139 and impeller 140.In this embodiment, sacrificial body 141 is installed on some blades 145, with rotation therewith.Each sacrificial body 141 comprises the pin 143 of the direction of pointing to the opposite direction that rotates with impeller 140, as shown by arrows.Sacrificial body 141 is made by the material that is used for electronics is come off, and other embodiment discusses as contacting before.

The various embodiments of Fig. 1 to Figure 10 have disclosed sacrificial body, the corrosion owing to the liquid stream that flows through from it of this sacrificial body.The corrosion of sacrificial body is discharged into electronics in the liquid stream fluid, and this has suppressed the corrosion of more expensive pump assembly (for example liquid flows end block and housing).These sacrificial body are easy to change and are not expensive.

In aforementioned explanation to specific embodiment, for reason has clearly adopted specific term.But disclosure is not that intention is restricted to these selected particular term, and should be understood that each particular term comprises the equivalent of other technology, and it operates to finish similar technical purpose by similar mode.Such as " left side " and " right side ", " front " and " afterwards ", " on " and " under ", and similarly term is used as being convenient to provide the wording of reference point, and being construed as limiting property term not.

In this explanation, wording " just comprises " that the semanteme of Ying Yiqi " open " understands, that is, understand with the semanteme of " also comprising ", and thereby be not defined as the semanteme of its " closed ", it is the semanteme of " only comprising ".The corresponding meaning will be attributed in the corresponding wording of its appearance place and " comprise ", " being included " and " comprising single ".

In addition, aforementioned some embodiments that institute's disclosure only is described, and to its can replace, revise, additional and/or change and do not deviate from the embodiment's who discloses scope and spirit, these embodiments are illustrative and not restrictive.

And, this disclosure has combined and currently has been considered to the most practicality and preferred embodiment is illustrated, it should be understood that, the embodiment that this disclosure is not limited to disclose, but antithesis, be that intention covers the different embodiment who comprises within the spirit and scope of this disclosure and the layout that is equal to.And the different embodiment of disclosed above can implement in conjunction with other embodiment, and for example, an embodiment's many-side can be in conjunction with another embodiment's many-side to realize again other embodiment.And each of any given accessory independently feature or assembly can consist of extra embodiment.

Claims

1. a minimizing comprises the method for the cavitation infringement of pump inner assembly:

(a) sacrificial body is installed within the described pump; And

(b) operate described pump, flow with the speed pump pressure liquid that causes at least some cavitations occur at described assembly,

Wherein, the liquid stream of pump pressure flows through described sacrificial body, and electronics is shed in the liquid that the flows stream of contiguous described cavitation.

2. the method for claim 1, wherein described sacrificial body comprises the material that is easier to corrosion than described assembly.

3. the method for claim 1, wherein in use, described operating procedure causes hydrogen ion to discharge from described assembly, alleviates described hydrionic release by the described electronics that comes off from described sacrificial body.

4. the method for claim 1 further comprises at least one pin is attached to described sacrificial body, comes off from described sacrificial body to promote described electronics.

5. method as claimed in claim 4, wherein, described pin points to the downstream in use.

6. method as claimed in claim 4, wherein, described pin is made by the metal that is not subject to corrosion of comparing with described sacrificial body.

7. the method for claim 1 comprises that further upstream portion with described sacrificial body is installed to the step in the described pump, and described sacrificial body has the profile that enhanced flow is crossed the described liquid stream turbulent flow of described sacrificial body.

8. the method for claim 1, wherein described pump is positioned such that described pump will be by in the liquid of the described pump pump pressure stream without any partly being immersed in.

The method of claim 1, wherein described sacrificial body by making from one or more materials in the group that comprises zinc, aluminium, magnesium or its alloy.

10. the method for claim 1, wherein described assembly comprises liquid stream end block, the suction valve port that it has the chamber, leads to the plunger piston borehole of described chamber, leads to described chamber, and the expulsion valve port that passes through from described chamber.

11. method as claimed in claim 10, wherein, step (a) comprises described sacrificial body is installed within the described chamber.

12. method as claimed in claim 10, wherein, step (a) comprises described sacrificial body is fixedly secured within the described plunger piston borehole that surrounds described plunger.

13. method as claimed in claim 10, wherein, step (a) comprises described sacrificial body is installed to described suction valve, to move with it.

14. method as claimed in claim 10, wherein, step (a) comprises described sacrificial body is installed within the suction valve port of suction valve upstream.

15. method as claimed in claim 10, wherein, described assembly is included in the plunger in the described plunger piston borehole.

16. method as claimed in claim 15, wherein, step (a) comprises sacrificial body is installed to described plunger.

17. the method for claim 1, wherein described assembly is included in the housing that wherein has rotatable impeller.

18. method as claimed in claim 17, wherein, step (a) comprises described sacrificial body is installed within the housing adjacent with described impeller periphery.

19. method as claimed in claim 17, wherein, step (a) comprises described sacrificial body is installed to described impeller, with rotation therewith.

20. a pump comprises:

Liquid stream end block, the suction valve port that it has the chamber, leads to the plunger piston borehole of described chamber, leads to described chamber, and the expulsion valve port that passes through from described chamber;

Suck and expulsion valve, it is mounted for reciprocal within described suction valve port and expulsion valve port respectively;

Sacrificial body, it is installed within the described liquid stream end block, is used in use immersing liquid stream fluid; And

Described sacrificial body is made by the material that is difficult for the tolerance corrosion of comparing with described liquid stream end block.

21. pump as claimed in claim 20 further comprises at least one pin that is installed on the described sacrificial body, described pin is dipped in the described liquid stream fluid in use.

22. pump as claimed in claim 21, wherein, described pin is made by comparing the metal that more can tolerate corrosion with described sacrificial body.

23. pump as claimed in claim 20 further comprises the profile that is configured to strengthen turbulent flow.

24. pump as claimed in claim 23, wherein, described profile is positioned at the upstream portion of described sacrificial body.

25. pump as claimed in claim 20, wherein, described sacrificial body is by making from one or more materials in the group that comprises zinc, aluminium, magnesium or its alloy.

26. pump as claimed in claim 20, wherein, described sacrificial body comprises sleeve, and this sleeve is fixedly mounted within the described plunger piston borehole that surrounds described plunger.

27. pump as claimed in claim 20, wherein, described sacrificial body is mounted to the front end of described plunger, to move with it.

28. pump as claimed in claim 20, wherein, described sacrificial body is mounted to described suction valve, to move with it.

29. pump as claimed in claim 20, wherein, described sacrificial body is installed within the suction valve port of described suction valve upstream.

30. a pump comprises:

Housing;

Rotatable impeller, it is installed within the described housing;

Sacrificial body, it is installed within the described housing, is used in use along with described vane rotary immerses in the liquid stream fluid; And

Described sacrificial body is made by the material that does not tolerate corrosion of comparing with described impeller and described housing.

31. pump as claimed in claim 30, wherein, described sacrificial body is installed to the interior section adjacent with described impeller periphery of described housing.

32. pump as claimed in claim 30, wherein, described sacrificial body is mounted to described impeller, with rotation therewith.

33. a device is used for retardance owing to the damage of cavitation to pump, it comprises:

Sacrificial body, it is applicable to be installed within the described pump, described sacrificial body by be selected to when time within the flow stream that is dipped into described pump the come off material of electronics make; And

At least one pin, it is installed to described sacrificial body, and more can tolerate because the material of the corrosion that flow stream causes is made by comparing with described sacrificial body.

34. device as claimed in claim 33, wherein, described sacrificial body comprises sleeve, and it has the profile that forms on the outer surface to strengthen the liquid stream turbulent flow that in use flows through described sleeve, and described profile is suitable for the upstream at described at least one pin.

35. device as claimed in claim 33, wherein, described sacrificial body comprises dish, it has circular periphery, and be suitable for being mounted to the inner end of the plunger of described pump, wherein, described at least one pin is installed to the end face of described dish in the mode of aiming at the axle of described dish.

36. device as claimed in claim 35, wherein, described at least one pin is hidden within the hole that forms on the end face of described dish, and the fluid port part that extends through described dish arrives the bottom in described hole, so that liquid stream is directed to described pin.

37. device as claimed in claim 33, wherein, described sacrificial body comprises ring, and it is suitable for being installed to the downstream end face of the suction valve of described pump, and wherein, described at least one pin is installed to the end face of described ring in the mode of aiming at the axle of described ring.

38. device as claimed in claim 37 further comprises fluid port, its side from described ring is led to the end face adjacent with described at least one pin of described ring, and described fluid port is in the outside of the internal diameter of described ring.

39. device as claimed in claim 33 further comprises support rod, described sacrificial body is installed on the described support rod, and described support rod is suitable for being installed in the inside of described pump.

40. device as claimed in claim 33, wherein, described sacrificial body is by making from the material in the group that comprises zinc, aluminium, magnesium or its alloy.