CN104251214A - Centrifugal pump - Google Patents
Centrifugal pump Download PDFInfo
- Publication number
- CN104251214A CN104251214A CN201410286913.4A CN201410286913A CN104251214A CN 104251214 A CN104251214 A CN 104251214A CN 201410286913 A CN201410286913 A CN 201410286913A CN 104251214 A CN104251214 A CN 104251214A
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- Prior art keywords
- opening portion
- exhaust port
- diameter
- impeller
- suction port
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
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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
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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
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
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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
- F04D9/00—Priming; Preventing vapour lock
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention provides a centrifugal pump which can play a part more stably, and preferably restrain at least one of the capacity reduction of the pump and the gas amount dissolved in the liquid. The centrifugal pump (1) comprises a suction inlet (13) for sucking a fluid; an impeller (5) at least possessing a plurality of blades at the side of the suction inlet, and sucking the fluid from the suction inlet by taking a specific shaft (3) penetrating the suction inlet as the center to rotate, and discharging the fluid in the direction orthorhombic with the shaft; a pump head (6) possessing the suction inlet, and accepting the impeller (5);a first opening part (10)arranged at the position opposite to the blades at the pump head and the suction inlet side; a second opening part (11) arranged at the part of the pump head orthorhombic with the shaft and/or the part of the pump head reverse with the suction inlet side; and a path (12) for connecting the first and second opening parts.
Description
Technical field
The present invention relates to centrifugal pump.
Background technique
Generally speaking, in the cyclic process of the liquid such as the cooling liquid needed for the cooling of lathe, centrifugal pump is used.Centrifugal pump utilizes the pump chamber that produces because of the rotation of impeller to suck liquid with outside pressure reduction, the centrifugal force brought by the rotation of paying impeller to liquid and being discharged.That is, the centrifugal force that centrifugal pump can utilize the rotation of impeller and this rotation to bring carries out suction and the discharge of liquid.
But if gas is mixed in liquid, then centrifugation will occur in the inside of centrifugal pump, that is, liquid moves to the outside of impeller, and gas is trapped in the central part of impeller.Therefore, in centrifugal pump, if continue entrained gas in liquid, then under the impact of centrifugation, process along with running time is grown up by the gas being trapped in central part, and the gas of having grown up blocks near the central part of suction port and impeller, the reason that the ability becoming pump reduces.
As the method solving this problem, it is well known that offer through hole at the central part of impeller and make gas be trapped in the back side of impeller, vacuum system is utilized to be discharged.In addition, in groove type vertical centrifugal pump, as the stage impeller structure of the impeller be provided with to Pump Suction Nozzle pressurization, it is well known that by making the retentate portion of gas be malleation and to the method for the outside Exhaust Gas of pump chamber.But these methods have to add new device or parts, cause cost to increase.
On the other hand, in recent years, in lathe industry, for the object caring about environment and cutting down cost, tend to the use amount reducing cooling liquid, the capacity arranging the tank of centrifugal pump is tending towards reducing.Therefore, in tank, the cycle-index of cooling liquid increases, and the gas produced because of the circulation of cooling liquid increases, and the gas being drawn into centrifugal pump increases.Consequently, be detained a large amount of bubble in the inside of centrifugal pump, as mentioned above, the gas being trapped in the central part of impeller becomes more important to the discharge of pump chamber outside.
Love environment and cutting down cost are the common objects of each industry, and are not limited to lathe industry, and lathe especially needs the cooling of cooling liquid, need to suppress the gas of pump inside to be detained the ability reduction of the pump caused.
As the method solving this problem, in patent documentation 1, describe a kind of centrifugation pump, this centrifugation pump is for impeller, the inner region of pump chamber formed by the attraction sleeve covered around impeller and be provided with the attraction sleeve leading to the outlet pipe of the outside of suction port side from inner region.In patent documentation 1, describe following content: according to this centrifugation pump, the outlet pipe being arranged at attraction sleeve can be utilized externally to discharge from the gas the gas-liquid of suction port attraction from inner region.
Patent documentation 1: German patent application discloses No. 4325549 specification
Utilizing the centrifugation pump described in patent documentation 1, when not causing cost to increase from the inner region of pump externally Exhaust Gas, the reduction of pump capacity can be suppressed.But the exhaust port due to discharge tube exists only in suction port side, therefore, discharge a large amount of gases by among the attraction being rolled into pump again internally region flow into.Consequently, gas is detained at the inner region of pump, so the occurrence frequency sucking bad condition increases.That is, the situation that pump can not play consistently ability increases.Lathe industry in recent years looks forward to the centrifugal pump that energy rejection ability reduces, and strongly looks forward to the centrifugal pump occurring the ability that can more play consistently.In addition, also there is the situation needing the amount suppressing the gas (such as oxygen etc.) dissolved in a liquid in the difference of the kind of the liquid handled by centrifugal pump.
Summary of the invention
Therefore, the object of the invention is to realize at least one aspect in following two aspects: the centrifugal pump that more can play consistently ability is provided, the centrifugal pump that the ability that can suppress pump reduces preferably is provided; Suppress the amount of the gas dissolved in a liquid.
In order to solve the problems of the technologies described above, reach object, centrifugal pump of the present invention comprises: suction port, and it sucks fluid; Impeller, it at least has multiple blade in suction port side, and sucks fluid, to direction displacement fluids orthogonal to the axis by carrying out rotating centered by the axle of the regulation through suction port from suction port; Pump head, it has suction port, and receives impeller; First opening portion, it is opened in the position opposed with multiple blades of suction port side of pump head; Second opening portion, it is opened in the position at least one direction being present in the direction orthogonal with described axle and the direction contrary with described suction port side of described pump head; Path, the first opening portion is connected with the second opening portion by it.
Centrifugal pump of the present invention comprises: suction port, and it sucks fluid; Impeller, it at least has multiple blade in suction port side, and sucks fluid, to direction displacement fluids orthogonal to the axis by carrying out rotating centered by the axle of the regulation through suction port from suction port; Pump head, it has suction port, and receives impeller; First opening portion, it is opened in the position opposed with multiple blades of suction port side of pump head; Second opening portion, it is opened in the position be present on direction orthogonal to the axis of pump head; Path, the first opening portion is connected with the second opening portion by it.
Path is preferably more than two less than ten.
The diameter of a circle obtained in the end of the internal side diameter of the blade by linking impeller is set to Ds, and when the diameter of impeller is set to D, the first opening portion is preferably opened in the scope of more than 1.0Ds below 1.0D centered by axle.
The cross section orthogonal with its bearing of trend of path is preferably circular, and the diameter in cross section is preferably less than more than 10% 50% relative to the diameter of the exhaust port of displacement fluids.
Centrifugal pump of the present invention can realize more playing consistently ability and preferably suppress the ability of pump reduce and suppress at least one aspect in these two aspects of amount of the gas dissolved in a liquid.
Accompanying drawing explanation
Fig. 1 is the External view comprising partial cross section of the centrifugal pump of embodiments of the present invention.
Fig. 2 is the plan view of the impeller represented from the side, suction face of embodiments of the present invention.
Fig. 3 is the sectional view of the overview of the head representing embodiments of the present invention.
Fig. 4 is the plan view of the inhalation mask of embodiments of the present invention.
Fig. 5 is the expression observed from the projection plan view relative to the inhalation mask region of the impeller diameter of embodiments of the present invention.
Fig. 6 is the sectional view of the overview of the first variation of the head representing embodiments of the present invention.
Fig. 7 is the sectional view of the overview of the second variation of the head representing embodiments of the present invention.
Fig. 8 is the sectional view of the overview of the 3rd variation of the head representing embodiments of the present invention.
Fig. 9 is the sectional view of the overview of the 4th variation of the head representing embodiments of the present invention.
Figure 10 is the External view of the testing installation of the centrifugal pump representing embodiments of the present invention.
Figure 11 is the chart of the result of the first performance test of the centrifugal pump representing embodiments of the present invention.
Figure 12 is the sectional view of the overview of the head represented in the second performance test of the centrifugal pump being applied to embodiments of the present invention.
Figure 13 is the chart of the result of the second performance test of the centrifugal pump representing embodiments of the present invention.
Description of reference numerals
1,1A centrifugal pump; 2 motor; 2a flange; 3 axles; 3a through hole; 3b main part; 3c end; 3d screw section; 3e key; 4 safety covers; 5 impellers; 6,6A, 6B, 6C, 6D, 6E pump head; 7 end faces; 7a first end face; 7b second end face; 8 sides; 8a first side; 8b second side; 9 pump chambers; 9a region; 10,10a first opening portion; 11,11b second opening portion; 12 paths; 12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i exhaust port; 13 suction ports; 14 exhaust ports; 14b spot-facing portion; 15 support units; 16,16a L-type pipe arrangement; 17,17a pipe arrangement; 18 connected elements; 19a, 19b bolt; 20a, 20b nut; 21 impeller nuts; 22 through holes; 24 tank tanks; 25 fluids; 26 pipe arrangements (circulation is used); 27 pressure meters; 28 valves; 29 exhaust ports; 30 connectors; 50 disks; 50a central part; 50b keyway; 50c through hole; 50d outer rim; 51 blades; 52 boss part; 53 circumference; 60,600 shells; 61,610 inhalation masks; 62 recesses; 63 protuberances; 64 curved face part; 60a, 60b, 61b internal surface; 61a plane; 70 second row outlets; C1, C2, C3, C4, C5 center; CL center line; CP center region; The dp degree of depth; D, D1, D2, D3, D4 diameter; Db tank diameter; H, Hb, h1, h2, h3, h4, h5 height; L1, L2, L3, L4, L5, L6, L7 length; P1, P2 dotted line; S scope; α 1, α 2 angle
Embodiment
Below, based on accompanying drawing, embodiments of the present invention are described in detail.Note, the present invention is not by the restriction of this mode of execution.
Fig. 1 is the External view comprising partial cross section of the centrifugal pump of embodiments of the present invention.Fig. 2 is the plan view of the impeller of embodiments of the present invention.Fig. 3 is the sectional view of the overview of the head representing embodiments of the present invention.Fig. 4 is the plan view of the inhalation mask of embodiments of the present invention.Fig. 5 is the expression observed from the projection plan view relative to the inhalation mask region of the impeller diameter of embodiments of the present invention.In the present embodiment, as prime mover of centrifugal pump 1, will be described for motor, but prime mover of centrifugal pump is not limited thereto.Such as, motor can also be used as prime mover by centrifugal pump.
The pump head 6 that centrifugal pump 1 has motor 2, is connected to the axle 3 of motor 2, is connected to the impeller 5 of the end 3c of axle 3 and storage impeller 5.In addition, centrifugal pump 1 has the periphery that is configured in axle 3 and the safety cover 4 of protection axle 3 and be linked to safety cover 4 with motor 2 and the support unit 15 of supporting motor 2.In addition, safety cover 4 is linked to support unit 15 and pump head 6.Pump head 6 has shell 60 and inhalation mask 61, is formed and sucks the suction port 13 of fluid and the exhaust port 14 of displacement fluids.In addition, shell 60 and inhalation mask 61 are fixed by bolt 19b and nut 20b.Pump head 6 is formed with the first opening portion 10 at the position 65A of inhalation mask 61.In addition, pump head 6 is formed with the second opening portion 11 at the position 65B of inhalation mask 61.On the inhalation mask 61 of pump head 6, be formed with the path 12 the first opening portion 10 and the second opening portion 11 connected.On exhaust port 14, the driving side towards pump is connected with L-type pipe arrangement 16.In addition, L-type pipe arrangement 16 is connected with pipe arrangement 17 and connected element 18.
In centrifugal pump 1, motor 2 utilizes the supply electric power from outside carry out driving and axle 3 is rotated, the impeller 5 of the end 3c being fixed on axle 3 is rotated centered by the axle of the regulation through suction port 13 that is centre line C L, thus, the discharge to the direction orthogonal with centre line C L of the suction of fluid and fluid is carried out.
Motor 2 is prime mover (driving source) that axle 3 is rotated.Motor 2 (suction port 13 side of centrifugal pump 1) on support unit 15 is provided with flange 2a.Flange 2a is fixed on support unit 15 by bolt 19a and nut 20a.
Axle 3 comprises the main part 3b of the metal pole extended towards pump head 6 side from motor 2 and is fixed on the end 3c of one end of this main part 3b.Main part 3b is connected to motor 2, and protected cover 4 is protected.End 3c is provided with key 3e, is formed with screw section 3d in the front of end 3c.Safety cover 4 is such as fixed by welding with support unit 15, supports support unit 15.
Impeller 5 has multiple blade, and diameter is D.Specifically, as shown in Figure 2, impeller 5 has disk 50 and more blades 51.Impeller 5 six blades 51 are shaped in resinous disk 50 that diameter is D.Note although not shown, but having six blades the dorsal part of disk 50 is one-body molded too.Boss part 52 is formed at the central part 50a of disk 50.Boss part 52 is formed with the through hole 50c comprising keyway 50b.As shown in Figure 1, impeller 5 is by making key 3e be entrenched in keyway 50b and impeller nut 21 being screwed into the screw section 3d of axle 3 and being fixed on the end 3c of axle 3.
In impeller 5, boss part 52 and link impeller 5 blade 51 internal side diameter end and between the circumference 53 of diameter Ds that obtains centered by region CP.Impeller 5 makes six blades 51 be configured in the radial outside of center region CP.Blade 51 is formed from circumference 53 towards the outer rim 50d of disk 50 deviously to the reverse directions of impeller 5, and the circumference towards disk 50 equally spaced configures.Disk 50 is not limited to resin-made, also can be the metal such as stainless steel.At this, impeller 5 also can not make disk 50 and blade 51 one-body molded.Such as, impeller 5 can also be installed blade 51 and be formed on disk 50.
As shown in Figure 3, pump head 6 is drum, has the through hole 3a centered by centre line C L and suction port 13, and receives impeller 5.Pump head 6 have columned shell 60, Flange-shaped Parts inhalation mask 61 and by bolt 19b fixing with inhalation mask 61 for shell 60 and nut 20b.
In shell 60, the first end face 7a becoming the end face (becoming the face of the end on centre line C L direction) 7 on the centre line C L direction of pump head 6 is formed as vertical with centre line C L.On shell 60, be formed with the through hole 3a centered by centre line C L from the first end face 7a towards recess 62a.Axle 3 is inserted in through hole 3a.
Shell 60 is formed with through hole 3a, recess 62 and recess 62a centered by centre line C L.Recess 62 is formed on the face (face of suction port 13 side) of inhalation mask 61 side in the mode protruded to through hole 3a side.Recess 62 is by intersect with plane 61d and the internal surface 60d parallel with centre line C L and the internal surface 60c vertical with centre line C L is formed.The face from inhalation mask 61 side (face of suction port 13 side) of recess 62 is dp to the degree of depth of internal surface 60c.Recess 62 is formed at through hole 3a side i.e. the internal surface 60c of recess 62.Recess 62a is formed by the internal surface 60b parallel with centre line C L and the internal surface 60a vertical with centre line C L.
On shell 60, be formed with the first side 8a of the side (end face on the direction orthogonal with centre line C L of pump head 6) 8 becoming pump head 6.On shell 60, be formed with the exhaust port 14 that the internal surface 60b from the first side 8a to recess 62a offers.The diameter of the end of the internal surface 60a side of exhaust port 14 is D3.That is, the diameter of the opening of position that exhaust port 14 is connected with the space of the inside of recess 62a is D3.Shell 60 is formed with spot-facing portion 14b in exhaust port 14, and this spot-facing portion 14b caves in from the first side 8a towards recess 62, connects for pipe arrangement.Spot-facing portion 14b is not limited to make the insertion transfiguration of pipe arrangement easily arrange.Such as, if pipe arrangement can be connected to exhaust port 14, spot-facing portion 14b also can not be set.
As shown in Figure 3, on inhalation mask 61, be formed with the plane 60e vertical with centre line C L, parallel with centre line C L and become the second side 8b of the side 8 of pump head 6 and vertical with centre line C L and possess the curved face part 64 of the second end face 7b of the end face 7 becoming pump head 6.In addition, it is highly the protuberance 63 of H that inhalation mask 61 possesses, and this protuberance 63 is formed by the curved surface 61c parallel with centre line C L and the plane 61a vertical with centre line C L, and gives prominence to from curved face part 64 towards shell 60.Inhalation mask 61 is formed with through hole, and this through hole is through towards plane 61a from the second end face 7b, and becomes the suction port 13 centered by centre line C L.
Pump head 6 is in suction port 13 side of inhalation mask 61 and the position 65A opposed with multiple blades 51 of impeller 5 offers the first opening portion 10.First opening portion 10 is opened in suction port 13 side of inhalation mask 61 and is on the opposed plane 61a of multiple blades 51 of the impeller 5 of D with diameter.
In addition, pump head 6 offers the second opening portion 11 being present in the position 65B on the direction orthogonal with centre line C L.Specifically, on the direction orthogonal with centre line C L, the second side 8b offers the second opening portion 11.That is, in the present embodiment, the second side 8b is equivalent to the position 65B be present on the direction orthogonal with centre line C L of pump head 6.The center C1 of the first opening portion 10 be formed in diameter centered by centre line C L for D1 circumferentially.Further, the first opening portion 10 is opened near the center region CP of impeller 5.Second opening portion 11 is opened on the direction orthogonal with centre line C L.The center C2 of the second opening portion 11 is formed in the position with the second end face 7b distance R.In addition, in the second opening portion 11, screw section 31 is formed with.
Inhalation mask 61 is formed exhaust port 12a and exhaust port 12b.The cross section orthogonal with bearing of trend of exhaust port 12a and the cross section orthogonal with bearing of trend of exhaust port 12b are circular.Inhalation mask 61 makes exhaust port 12a be connected with exhaust port 12b and form path 12.Exhaust port 12a extends from the first opening portion 10 towards the second end face 7b, length is L1 and diameter is the hole of d1.Exhaust port 12b extends from the second opening portion 11 towards suction port 13, length is L2 and diameter is the hole of d1.Exhaust port 12a with the end of the first opening portion 10 opposite side and being connected with angle [alpha] 1 in inhalation mask 61 with the end of the second opening portion 11 opposite side of exhaust port 12b.Thus, exhaust port 12a and exhaust port 12b form the path 12 be connected, and the first opening portion 10 being exposed to recess 62a is connected with the second opening portion 11 being exposed to side 8b.The length L1 of exhaust port 12a is than short to the length LH of the second end face 7b from plane 61a, and the length L2 of exhaust port 12b is than short to the length LW of internal surface 61b from the second side 8b.In the present embodiment, the diameter d 1 of exhaust port 12a and exhaust port 12b is same size, but is not limited to this, also can be diameter different from each other.And connect with the angle [alpha] 1 of 90 °, but be not limited to this, angle [alpha] 1 also can be such as acute angle or obtuse angle.
As shown in Figure 4, on inhalation mask 61, in order to make bolt 19b pass, define eight through holes 22 and suction port 13.And, the first opening portion 10, second opening portion 11, exhaust port 12a and exhaust port 12b respectively every four be one group with the gap-forming of angle [alpha] 2.At this, the angle that angle [alpha] 2 is is benchmark with centre line C L 1 is adjacent exhaust port 12b angulation each other.Although in the present embodiment, angle [alpha] 2 is 90 °, is not limited to this.Such as, the first opening portion 10, second opening portion 11, exhaust port 12a and exhaust port 12b also can be one to three.And the first opening portion 10, second opening portion 11, exhaust port 12a and exhaust port 12b also can be more than five, and angle [alpha] 2 also can be made to be formed as 60 ° or 30 °.
As shown in Figure 3, pump head 6 is recess 62 by the protuberance 63 of inhalation mask 61 being inserted into shell 60 and is formed.Specifically, recess 62 and protuberance 63 make the internal surface 60d of recess 62 contact with the curved surface 61c of protuberance 63, and the plane 61d of recess 62 is contacted with the plane 60e of curved face part 64.The height H of the protuberance 63 of inhalation mask 61 is formed as lower than the degree of depth dp of the recess 62 of shell 60.Therefore, if the protuberance 63 of inhalation mask 61 is inserted into the recess 62 of shell 60 and forms pump head 6, then the pump chamber 9 as inner space is defined.
Pump chamber 9 is formed by suction port 13, region 9a and exhaust port 14.Region 9a is the space surrounded by the plane 61a of the protuberance 63 of the internal surface 60a of shell 60, internal surface 60b, internal surface 60c and internal surface 60d and inhalation mask.In the 9a of region, a part of plane 61a is connected with suction port 13, and a part of internal surface 60d is connected with exhaust port 14.That is, pump chamber 9 is the regions arriving exhaust port 14 from suction port 13 via region 9a.As shown in Figure 1, the fluid of discharging from exhaust port 14 is externally discharged with the connected element 18 be connected via support unit 15 by L-type pipe arrangement 16, the pipe arrangement 17 that is connected to L-type pipe arrangement 16.Pump chamber 9 is inner regions shell 60 and inhalation mask 61 being combined and obtains, but is not limited to this.Such as, even if pump head 6 is that a processed goods or products formed are also harmless, as long as pump chamber 9 is formed with the region becoming stream.
Centrifugal pump 1 adopts and produces negative pressure by making impeller 5 rotate at the entrance part of impeller 5 and then suck the principle of fluid from suction port 13.Further, in order to the gas accumulating in inner region is discharged in the outside to pump chamber 9, centrifugal pump 1 needs the path 12 that be on the pressure side connected low with the pressure of the center region CP than impeller 5.Such as, in the centrifugal pump 1 that impregnated in tank, if there is no the place that can produce the pressure lower than the pressure produced at the center region CP of impeller 5 when being used alone pump, so also just cannot produce.Therefore, there is pressurization at 51, the blade of impeller 5, therefore at the center region CP close to impeller 5 of pump head 6 and the position 65A opposed with the blade 51 of impeller 5, offer and lead to outside path 12 from pump chamber 9.Therefore, it is possible to utilize the pressure reduction between the center region CP of impeller 5 and the outside of pump chamber 9 to the outside Exhaust Gas of pump chamber 9.Further, by the second opening portion 11 being arranged on the position 65B be present on the direction orthogonal with centre line C L of pump head 6, the gas be discharged becomes broken bubble under the pressurization of impeller 5, floats in tank inner fluid.Further, bubble can be suppressed again to enter from suction port 13.That is, when only being discharged as bubble by the gas accumulating in center region CP in suction port 13 side, a large amount of bubble sucks from suction port 13.Further, the bubble be inhaled into is discharged again in tank.That is, bubble in tank with pump Inner eycle.In the present embodiment, a large amount of bubble is discharged to the direction orthogonal with centre line C L and is floated in tank.Therefore, centrifugal pump 1 can suppress bubble again to enter from suction port 13.Consequently, the amount accumulating in the gas of center region CP reduces, and therefore, centrifugal pump 1 can suppress suck bad and discharge bad generation, can play consistently ability.And because the amount accumulating in the gas of center region CP reduces, therefore centrifugal pump 1 can the reduction of rejection ability.
If bubble and liquid comes into contact, then the gas forming bubble incorporates in liquid sometimes.In this case, the bubble residence time is in a liquid longer, and the amount being dissolved in the gas of liquid is more.In the present embodiment, bubble is discharged to the direction orthogonal with centre line C L and the distance of floating to the water surface in tank to be discharged from suction port 13 side than bubble and the distance of floating to the water surface in tank is short.Therefore, and only discharge compared with the situation of bubble from suction port 13 side, the time of bubble residence in liquid is short.Consequently, centrifugal pump 1 can suppress the amount of the gas dissolved in liquid.
The number of path 12 is preferably more than two less than ten.At this, the number of path 12 represents the number in the path of discharging bubble.By making the number of path 12 be more than two, as long as relative to centre line C L equivalent arrangements, just bubble can be discharged evenly.On the other hand, by making path 12 be less than ten, when not discharging the liquid of the amount that the ability that causes pump reduces, can be exhausted efficiently.It is further preferred that path 12 is more than four less than eight.
Ds is set at the diameter of the starting point (link the end of centre line C L side and the circle that obtains) of the blade 51 by impeller 5, when the diameter of impeller 5 is set to D, the first opening portion 10 is preferably opened in the scope S of more than 1.0Ds below 1.0D centered by centre line C L.In other words, in the scope S that the circle that the circle that it is 1.0Ds that the first opening portion 10 is preferably formed in by the diameter centered by centre line C L and the diameter centered by centre line C L are 1.0D surrounds.At this, as shown in Figure 5, scope S represents by representing the dotted line P2 of 1.0Ds and representing the part that the dotted line P1 of 1.0D surrounds in inhalation mask 61, comprises dotted line P1, P2.
By the outside (comprising border) making the first opening portion 10 be opened in the circle that the diameter centered by centre line C L is 1.0Ds, centrifugal pump 1 can discharge the gas of center region CP under the pressurization of impeller 5 from the first opening portion 10.On the other hand, the first opening portion 10 is formed by the inner side (comprising border) of the circle being 1.0D at the diameter centered by centre line C L, centrifugal pump 1 can suppress liquid to flow out from the first opening portion 10 under the pressurization of impeller 5, and the ability of pump can be suppressed to reduce.
In addition, the first opening portion 10 is more preferably opened in the outside of the less circle in circle that the diameter centered by centre line C L is 1.05Ds and the circle that diameter is 1.0Ds+7mm.At this, 1.0Ds+7mm be the diameter Ds of the starting point (link the end of centre line C L side and the circle that obtains) of blade 51 at impeller 5 basis on consider the difference of the length LW shown in Fig. 3 and length L2 that is the minimum diameter of minimum wall thickness (MINI W.) and path 12 and the value that obtains.Minimum wall thickness (MINI W.) is preferably 1mm (counting 2mm with diameter), and the minimum diameter of path is preferably 5mm.If the first opening portion 10 is the outside of the circle of 1.05Ds or diameter at diameter is the outside of the circle of 1.0Ds+7mm, then minimum wall thickness (MINI W.) can be guaranteed, therefore the easy processing of the first opening portion 10.On the other hand, the first opening portion 10 is more preferably opened in the inner side of the circle that diameter is (D-Ds)/2+Ds.At this, diameter is the circle that the circle of (D-Ds)/2+Ds is through the center of scope S.If the first opening portion 10 is the inner side of the circle of (D-Ds)/2+Ds at diameter, be then conducive to discharging bubble by the pressurization of impeller 5.
The diameter d 1 of path 12 is preferably less than more than 10% 50% relative to the diameter D3 of exhaust port 14.By making diameter d 1 be more than 10% relative to the diameter D3 of exhaust port 14, the bubble roughly equal with attracted gas can be discharged continuously.On the other hand, by making diameter d 1 be less than 50% relative to the diameter D3 of exhaust port 14, the situation that the liquid transferred to exhaust port 14 is all discharged can be suppressed.Specifically, diameter d 1 is preferably more than 5mm below 20mm.Diameter d 1 is more preferably more than 8mm below 12mm.
Fig. 6 is the sectional view of the overview of the first variation of the head representing embodiments of the present invention.First variation is identical with aforesaid mode of execution, and difference is that the second opening portion 11 is opened in the position 65B of pump head 6A, and second row outlet 70 is also opened in the position 65C of pump head 6A.In the explanation of the first variation, omit the explanation to the structure identical with aforesaid mode of execution in principle, be described centered by different structures.
Pump head 6A is in suction port 13 side of inhalation mask 61 and the position 65A opposed with multiple blades 51 of impeller 5 has the first opening portion 10.First opening portion 10 be opened in inhalation mask 61 suction port 13 side and on the plane 61a opposed with multiple blades 51 of impeller 5.
In addition, pump head 6A offers the second opening portion 11 being present in the position 65B on the direction orthogonal with centre line C L.Specifically, on the direction orthogonal with centre line C L, the second side 8b offers the second opening portion 11.And pump head 6A offers second row outlet 70 at the position 65C of inhalation mask 61.That is, in this variation, the second side 8b is equivalent to the position 65B be present on the direction orthogonal with centre line C L of pump head 6A.In addition, the second end face 7b is equivalent to the position 65C of pump head 6A.
The center C1 of the first opening portion 10 be formed in diameter centered by centre line C L for D1 circumferentially.Further, the first opening portion 10 is opened near the center region CP of impeller 5.Second opening portion 11 is opened on the direction orthogonal with centre line C L.The center C2 of the second opening portion 11 is formed in the position with the second end face 7b distance R.And, second row outlet 70 be opened in and diameter concentric with the first opening portion 10 be D1 circumferentially.In addition, in the second opening portion 11 and second row outlet 70, screw section 31 is formed with.
Inhalation mask 61 is formed exhaust port 12c and exhaust port 12b.The cross section orthogonal with bearing of trend of exhaust port 12c and the cross section orthogonal with bearing of trend of exhaust port 12b are circular.Inhalation mask 61 makes exhaust port 12b be connected with exhaust port 12c and form path 12.Exhaust port 12c extends from the first opening portion 10 towards the second end face 7b, length is LH and diameter is the hole of d1.In addition, exhaust port 12c is through to the second end face 7b from the first opening portion 10.Exhaust port 12b extends from the second opening portion 11 towards suction port 13, length is L2 and diameter is the hole of d1.Further, exhaust port 12c is the path extended in one direction, and exhaust port 12b is the path extended in a different direction with exhaust port 12c, and the path corresponding to exhaust port 12c is connected with angle [alpha] 1 with the path corresponding to exhaust port 12b.Thus, exhaust port 12b and exhaust port 12c form the path 12 be connected, and the first opening portion 10 being exposed to recess 62a, the second row outlet 70 being exposed to the second end face 7b and the second opening portion 11 being exposed to the second side 8b are connected.The length L2 of exhaust port 12b is than short to the length LW of internal surface 61b from the second side 8b.In the present embodiment, the diameter d 1 of exhaust port 12b and exhaust port 12c is same size, but is not limited to this, also can be diameter different from each other.And connect with the angle [alpha] 1 of 90 °, but be not limited to this, angle [alpha] 1 also can be such as acute angle or obtuse angle.
In the first variation of the present invention, by forming the path 12 connecting the second opening portion 11 and second row outlet 70 from the first opening portion 10 on pump head 6A, centrifugal pump 1 discharges to the outside of pump head 6A the gas accumulating in the center region CP of impeller 5 via exhaust port 12b, 12c from pump chamber 9.The centrifugal pump 1 of the first variation is also formed with exhaust port at the position 65C of pump head 6A that is suction port 13 side.Further, bubble is discharged from the direction orthogonal with centre line C L and suction port side.Therefore, with only discharge the situation of bubble in suction port side compared with, the first variation can also discharge bubble from the direction orthogonal with centre line C L, and the amount that therefore bubble floats in tank increases.Further, the first variation can also suppress the amount again sucking bubble from suction port.Consequently, the centrifugal pump 1 of the first variation can suppress suck bad and discharge bad generation, can play consistently ability.In addition, because the amount accumulating in the gas of center region CP reduces, therefore the first variation can suppress the ability of pump to reduce.
In addition, with only discharge the situation of bubble from suction port side compared with, bubble is discharged from the second opening portion 11 and second row outlet 70, and therefore, the amount of the bubble floated to the water surface in tank increases.Consequently, with only discharge the situation of bubble from suction port side compared with, the first variation can suppress the amount of the gas dissolved in a liquid.
Fig. 7 is the sectional view of the overview of the second variation of the head representing embodiments of the present invention.Second variation is identical with the mode of execution shown in Fig. 3, and difference is that the second opening portion 11b is opened in the position 65D of pump head 6B.In the explanation of the second variation, omit the explanation to the structure shown in Fig. 3 in principle, be described centered by different structures.
Pump head 6B is in suction port 13 side of inhalation mask 61 and the position 65A opposed with multiple blades 51 of impeller 5 offers the first opening portion 10.First opening portion 10 be opened in inhalation mask 61 suction port 13 side and on the plane 61a opposed with multiple blades 51 of impeller 5.
In addition, pump head 6B offers the second opening portion 11 being present in the position 65B on the direction orthogonal with centre line C L.Specifically, on the direction orthogonal with centre line C L, the second side 8b offers the second opening portion 11.And pump head 6B offers the second opening portion 11b at the position 65D of shell 60.That is, in this variation, the second side 8b is equivalent to the position 65B be present on the direction orthogonal with centre line C L of pump head 6B.In addition, the first end face 7a is equivalent to the position 65D of pump head 6B.
The center C1 of the first opening portion 10 be formed in diameter centered by centre line C L for D1 circumferentially.Further, the first opening portion 10 is opened near the center region CP of impeller 5.Second opening portion 11 is opened on the direction orthogonal with centre line C L, and the center C2 of the second opening portion 11 is formed in the position with the second end face 7b distance R.And, the center C3 of the second opening portion 11b be formed in diameter centered by centre line C L for D2 circumferentially.In addition, in the second opening portion 11 and the second opening portion 11b, screw section 31 is formed with.
Inhalation mask 61 is formed exhaust port 12a, exhaust port 12b, exhaust port 12d and exhaust port 12e.The cross section orthogonal with bearing of trend of exhaust port 12a, exhaust port 12b, exhaust port 12d and exhaust port 12e is circular.Inhalation mask 61 makes exhaust port 12a, exhaust port 12b, exhaust port 12d and exhaust port 12e be connected and form path 12.Exhaust port 12a extends from the first opening portion 10 towards the second end face 7b, length is L1 and diameter is the hole of d1.Exhaust port 12b extends from the second opening portion 11 towards suction port 13, length is L2 and diameter is the hole of d1.Exhaust port 12d extends from the second opening portion 11b towards plane 61d, length is L3 and diameter is the hole of d1.In addition, exhaust port 12d is through to plane 61d from the second opening portion 11b.Exhaust port 12e extends from plane 60e towards the second end face 7b, length is L4 and diameter is the hole of d1.Exhaust port 12a with the end of the first opening portion 10 opposite side and being connected with angle [alpha] 1 in inhalation mask 61 with the end of the second opening portion 11 opposite side of exhaust port 12b.In addition, exhaust port 12d with the end of the second opening portion 11b opposite side and being connected with the end of the second end face 7b opposite side of exhaust port 12e.And the position of the second end face 7b side of exhaust port 12e is connected with exhaust port 12b with angle [alpha] 1 in inhalation mask 61.Thus, exhaust port 12a, exhaust port 12b, exhaust port 12d and exhaust port 12e form connected path 12.Further, the first opening portion 10 being exposed to recess 62a, the second opening portion 11b being exposed to the first end face 7a and the second opening portion 11 being exposed to the second side 8b are connected.In the present embodiment, the diameter d 1 of the diameter d 1 of exhaust port 12a, exhaust port 12b, exhaust port 12d and exhaust port 12e is same size, but is not limited to this, also can be diameter different from each other.And connect with the angle [alpha] 1 of 90 °, but be not limited to this, angle [alpha] 1 also can be such as acute angle or obtuse angle.
In the second variation of the present invention, by forming the first opening portion 10, second opening portion 11, second opening portion 11b, exhaust port 12a, exhaust port 12b, exhaust port 12d and exhaust port 12e on pump head 6B, centrifugal pump 1 can discharge to the outside of pump head 6B the gas accumulating in the center region CP of impeller 5 via exhaust port 12a, exhaust port 12b, exhaust port 12d and exhaust port 12e from pump chamber 9.The pump of the second variation makes the second opening portion 11b be formed in the position 65D of pump head 6B that is the side contrary with suction port.Further, bubble is discharged from the direction orthogonal with centre line C L and the direction contrary with suction port.Therefore, with only discharge the situation of bubble in suction port side compared with, the second variation can suppress centrifugal pump 1 again to suck the amount of bubble better.Consequently, the pump possessing the second variation can suppress suck bad and discharge bad generation, more can play consistently ability.In addition, because the amount accumulating in the gas of center region CP reduces, therefore the first variation can suppress the ability of pump to reduce.
In addition, in the second variation, bubble from second opening portion 11b discharge until float to the water surface distance than bubble from suction port side discharge until float to the distance of the water surface short.And bubble is discharged until float and discharge until float to the distance of the water surface short from the second opening portion 11 than bubble to the distance of the water surface from the second opening portion 11b.Therefore, the centrifugal pump 1 of the second variation can shorten the bubble residence time in a liquid, therefore, it is possible to reduce the bubble residence time in a liquid further.Therefore, and only discharge compared with the situation of bubble from the direction orthogonal with centre line C L, the second variation can suppress the amount of the gas dissolved in a liquid better.
At this, the second variation represents the example of discharging bubble from the direction orthogonal with centre line C L and the direction contrary with suction port side, but also only can form the exhaust port of bubble to the direction contrary with suction port side.That is, the example of the second opening portion 11b is only formed at the position 65D of pump head 6B.
By only forming exhaust port that is the second opening portion 11b of bubble to the direction contrary with suction port side, bubble is only discharged from the second opening portion 11b.That is, bubble is discharged from the direction closer to the water surface in tank.With only discharge compared with the example of bubble from the direction orthogonal with centre line C L, the distance that bubble floating plays the water surface also shortens, and the time of being detained in a liquid also shortens.Consequently, the second variation can suppress the amount of the gas dissolved in a liquid better.In addition, due to the amount of the gas dissolved in a liquid can be suppressed better, be therefore especially applicable to the situation that the liquid of the dissolving reducing gas is wanted in process.
Fig. 8 is the sectional view of the overview of the 3rd variation of the head representing embodiments of the present invention.Mode of execution shown in 3rd variation with Fig. 3 is identical, and difference is that the second opening portion 11c is opened in the position 65E of pump head 6C.In the explanation of the 3rd variation, omit the explanation to the structure shown in Fig. 3 in principle, be described centered by different structures.
Pump head 6C is in suction port 13 side of inhalation mask 61 and the position 65A opposed with multiple blades 51 of impeller 5 offers the first opening portion 10.Specifically, the first opening portion 10 be opened in inhalation mask 61 suction port 13 side and on the plane 61a opposed with multiple blades 51 of impeller 5.
In addition, pump head 6C offers the second opening portion 11c being present in the position 65E on the direction orthogonal with centre line C L.Specifically, on the direction orthogonal with centre line C L, the first side 8a offers the second opening portion 11c.In this variation, the first side 8a is equivalent to the position 65E be present on the direction orthogonal with centre line C L of pump head 6C.
The center C1 of the first opening portion 10 be formed in diameter centered by centre line C L for D1 circumferentially.Further, the first opening portion 10 is opened near the center region CP of impeller 5.Second opening portion 11c is opened on the direction orthogonal with centre line C L, and the center C4 of the second opening portion 11c is formed in the position with the first end face 7a distance R1.In addition, in the second opening portion 11c, screw section 31 is formed with.
Shell 60 is formed exhaust port 12f.In addition, inhalation mask 61 is formed with exhaust port 12g and exhaust port 12h.The cross section orthogonal with bearing of trend of exhaust port 12f, exhaust port 12g and exhaust port 12h is circular.Shell 60 and inhalation mask 61 make exhaust port 12f, exhaust port 12g and exhaust port 12h be connected and form path 12.Exhaust port 12f extends from the second opening portion 11c towards internal surface 60d, length is L6 and diameter is the hole of d1.In addition, exhaust port 12f is through to internal surface 60d from the second opening portion 11c.Exhaust port 12g extends from the first opening portion 10 towards the second end face 7b, length is L5 and diameter is the hole of d1.Exhaust port 12h extends from curved surface 61c towards suction port 13, length is L7 and diameter is the hole of d1.Exhaust port 12f with the end of the second opening portion 11c opposite side and being connected with the end of suction port 13 opposite side of exhaust port 12h.Exhaust port 12g with the end of the first opening portion 10 opposite side and being connected with angle [alpha] 1 in inhalation mask 61 with the end of curved surface 61c opposite side of exhaust port 12h.Thus, exhaust port 12f, exhaust port 12g and exhaust port 12h form connected path 12, and the first opening portion 10 being exposed to recess 62a is connected with the second opening portion 11c being exposed to the first side 8a.
The length L5 of exhaust port 12g is than short to the length LH of the second end face 7b from plane 61a, and the length L7 of exhaust port 12h is than short to the length LW of internal surface 61b from the second side 8b.The length L5 of exhaust port 12g is shorter than the length L1 of the exhaust port 12a shown in Fig. 3.And, the length L6 of exhaust port 12f and the length L7 of exhaust port 12h length altogether identical with the length of the length L2 of the exhaust port 12b shown in Fig. 3.In this variation, the diameter d 1 of exhaust port 12f, exhaust port 12g and exhaust port 12h is same size, but is not limited to this, also can be diameter different from each other.And connect with the angle [alpha] 1 of 90 °, but be not limited to this, angle [alpha] 1 also can be such as acute angle or obtuse angle.
By forming the first opening portion 10, second opening portion 11c, exhaust port 12f, exhaust port 12g and exhaust port 12h on pump head 6C, centrifugal pump 1 discharges to the outside of pump head 6C the gas accumulating in the center region CP of impeller 5 via exhaust port 12f, exhaust port 12g and exhaust port 12h from pump chamber 9.In the 3rd variation, the length L5 of exhaust port 12g is shorter than the length L1 of the exhaust port 12a shown in Fig. 3.Therefore, the distance of discharging bubble shortens, and discharges drag reduction during bubble.Therefore, more easily bubble is discharged.Further, and only discharge compared with the situation of bubble in suction port 13 side, the 3rd variation can suppress the amount again sucking bubble.Consequently, the centrifugal pump 1 of the 3rd variation can suppress suck bad and discharge bad generation, can play consistently ability.And owing to can reduce the amount of the gas accumulating in center region CP, therefore the 3rd variation can suppress the ability of pump to reduce.
Fig. 9 is the sectional view of the overview of the 4th variation of the head representing embodiments of the present invention.4th variation is identical with aforesaid mode of execution, and difference is to be provided with multiple first opening portion 10,10a.In the explanation of the 4th variation, omit the explanation to the structure identical with aforesaid mode of execution in principle, be only described centered by different structures.
Pump head 6D is in suction port 13 side of inhalation mask 61 and the position 65A opposed with multiple blades 51 of impeller 5 offers the first opening portion 10 and the first opening portion 10a.First opening portion 10 and the first opening portion 10a be opened in inhalation mask 61 suction port 13 side and on the plane 61a opposed with multiple blades 51 of impeller 5.
In addition, pump head 6D offers the second opening portion 11 being present in the position 65B on the direction orthogonal with centre line C L.Specifically, on the direction orthogonal with centre line C L, the second side 8b offers the second opening portion 11.That is, in this variation, the second side 8b is equivalent to the position 65B be present on the direction orthogonal with centre line C L of pump head 6D.
The center C1 of the first opening portion 10 be formed in diameter centered by centre line C L for D1 circumferentially.In addition, the center C5 of the first opening portion 10a be formed in diameter centered by centre line C L for D4 circumferentially.Further, the first opening portion 10 is opened near the center region CP of impeller 5.Second opening portion 11 is opened on the direction orthogonal with centre line C L, and the center C2 of the second opening portion 11 is formed in the position with the second end face 7b distance R.In addition, in the second opening portion 11, screw section 31 is formed with.
Inhalation mask 61 is formed exhaust port 12a, exhaust port 12b and exhaust port 12i.The cross section orthogonal with bearing of trend of exhaust port 12a, exhaust port 12b and exhaust port 12i is circular.Inhalation mask 61 makes exhaust port 12a, exhaust port 12b and exhaust port 12i be connected and form path 12.Exhaust port 12a extends from the first opening portion 10 towards the second end face 7b, length is L1 and diameter is the hole of d1.Exhaust port 12b extends from the second opening portion 11 towards suction port 13, length is L2 and diameter is the hole of d1.Exhaust port 12i extends from the first opening portion 10a towards the second end face 7b, length is L1 and diameter is the hole of d1.Exhaust port 12a with the end of the first opening portion 10 opposite side and being connected with angle [alpha] 1 in inhalation mask 61 with the end of the second opening portion 11 opposite side of exhaust port 12b.In addition, being connected with angle [alpha] 1 in inhalation mask 61 with exhaust port 12b with the end of the first opening portion 10a opposite side of exhaust port 12i.Thus, exhaust port 12a, exhaust port 12b and exhaust port 12i form connected path 12, and the first opening portion 10 and the first opening portion 10a that are exposed to recess 62a are connected with the second opening portion 11 being exposed to the second side 8b.
The length L1 of exhaust port 12a and exhaust port 12i is than short to the length LH of the second end face 7b from plane 61a.The length L2 of exhaust port 12b is than short to the length LW of internal surface 61b from the second side 8b.In the present embodiment, the diameter d 1 of exhaust port 12a, exhaust port 12b and exhaust port 12i is same size, but is not limited to this, also can be diameter different from each other.And connect with the angle [alpha] 1 of 90 °, but be not limited to this, angle [alpha] 1 also can be such as acute angle or obtuse angle.
By forming the first opening portion 10, first opening portion 10a, exhaust port 12a, exhaust port 12b and exhaust port 12i on pump head 6D, centrifugal pump 1 discharges to the outside of pump head 6D the gas accumulating in the center region CP of impeller 5 via exhaust port 12a, exhaust port 12b and exhaust port 12i from pump chamber 9.Further, the bubble of discharging from the second opening portion 11 can be suppressed again to enter from suction port 13.Consequently, the centrifugal pump 1 of the 4th variation can suppress suck bad and discharge bad, plays consistently ability.In addition, compared with only offering the situation of first opening portion, the 4th variation can increase the discharge capacity of bubble.Consequently, the 4th variation can reduce the amount of the gas accumulating in center region CP, therefore, it is possible to suppress the ability of pump to reduce better.In addition, with only discharge the situation of bubble from suction port side compared with, the amount of floating in the 4th variation to the bubble of the water surface increases.Therefore, the 4th variation can reduce the amount of delay bubble in a liquid, therefore, it is possible to suppress the amount of the gas dissolved in a liquid.
[embodiment]
In order to evaluate centrifugal pump performance of the present invention, carry out air Injection test as the first performance test and the second performance test.Figure 10 represents equipment appearance during first and second performance test implementing centrifugal pump of the present invention.As shown in Figure 10, the head 6E of centrifugal pump 1A sinks in the fluid (clear water) 25 accumulated in the tank tank 24 of acrylic resin by the performance test of centrifugal pump 1A, make fluid 25 at tank tank 24 Inner eycle, by forcing to inject the ability reduction that air (air) measures centrifugal pump 1A in centrifugal pump 1A.Centrifugal pump 1A has that discharge capacity is 250L/min, total head is 23m, rotating speed is 2900min
-1and output power of motor is the performance of 3.7kW.In addition, the tank diameter Db of tank tank 24 is 780mm, and the height H b of tank is 470mm.And, flexible pipe is connected to and can regulates the air compressor of air quantity (not shown), air (air) is invaded to centrifugal pump 1A from water.
Tank tank 24 with the position relationship of centrifugal pump 1A is: the height h1 from the bottom of tank to liquid level is 370mm, height h2 from the second end face 7b of pump head 6E to liquid level is 170mm, the height h3 of the upper end from liquid level to tank is 100mm, height h4 from the bottom of tank to pump head 6E is 200mm, and the height h5 from the second end face 7b of pump head 6E to the upper end of tank is 270mm.In addition, the circulation of fluid 25 is connected element 18 by pipe arrangement 26 being connected to centrifugal pump 1A and again gets back in tank tank 24 to carry out.On pipe arrangement 26, in order to measure the discharge pressure of pump, pressure meter 27 is installed, but also in order to regulate the flow of pump to install valve 28.In addition, when making pipe arrangement 26 get back to fluid 25, make the refluxing opening of pipe arrangement 26 away from suction port not impact pump performance as far as possible, thus the air that the impact eliminating circulation as much as possible causes invades.
Shape and the structure of the inhalation mask 61 used in the first performance test are identical with the inhalation mask 61 shown in Fig. 6.Therefore, omit the description.In inhalation mask 61, the path of discharging bubble from the first opening portion 10 to the second opening portion 11 is four, and exporting 70 paths of discharging bubble from the first opening portion 10 to second row is four.The diameter D1 of the center C1 of the first opening portion 10 is 90mm, and the diameter d 1 of path 12 is 11mm.In addition, the diameter D of impeller 5 is 166mm, and the diameter Ds of the starting point of the blade 51 of impeller 5 (link the end of centre line C L side and the circle that obtains) is 70mm.Embodiment 1 is closed second row outlet 70 and makes bubble only from the example that the second opening portion 11 is discharged.Embodiment 2 exports with second row the example that 70 these two sides discharge bubble from the second opening portion 11.Comparative example is the example of closedown second opening portion 11 and second row outlet 70.When implementing embodiment 1, embodiment 2 and comparative example, come closed second opening portion 11 and second row outlet 70 by connector 30 being screwed into screw section 31.
Air Injection test is by making centrifugal pump 1A operate with 50Hz, utilize valve 28 by Flow-rate adjustment to 50L/min after valve 28 is fixed, utilize frequency variator that the rotating speed of motor is adjusted to 50Hz with the interval of 5Hz from 30Hz, utilize air compressor injection air to carry out by Air flow meter.Illustrate its result in fig. 11.Discharge pressure (m) in figure represents injects the front situation with injecting after maximum air Injection amount (L/min) of air.Discharge pressure (m) be pressure meter 27 reading divided by test time use clear water proportion and carry out Metric System-Concentration and obtain numerical value.
In the first performance test, due to frequency (rotating speed) for benchmark makes centrifugal pump 1A operate, therefore the presence or absence of path cause discharge pressure (m) change.Therefore, the performance evaluation of centrifugal pump of the present invention discharges the reduction of pressure (m) for maximum air Injection amount (L/min) research evaluation.That is, represent that maximum air Injection amount (L/min) is more and to discharge the reduction of pressure (m) less, then more effective, as long as it is just effective below to discharge pressure being reduced to of (m) 1.0 (m).In embodiments of the present invention that is embodiment 1 and embodiment 2, even if maximum air Injection amount (L/min) is 10.0 maximum (L/min), discharge the reduction of pressure (m) also at 1.0 (m) below.On the other hand, in the comparative example that the second opening portion is all blocked, although there is maximum air Injection amount (L/min) is that 0.4 (L/min) discharges the reduction of pressure (m) still more than the example of 1.0 (m).Therefore known, compared with comparative example, embodiment 1 and embodiment 2 more effective.
In addition, in embodiment 1, can confirm when discharging bubble from the second opening portion 11 by visual, the situation that bubble rises to liquid level.In example 2, can confirm when discharging bubble from second row outlet 70 by visual, the situation that bubble rises to liquid level and the situation sucking bubble from suction port 13.That is, embodiment 1 and embodiment 2 discharge bubble to the direction orthogonal with centre line C L, and bubble floats in tank, therefore inhibit the amount of suction from suction port 13 and dissolved gases.Therefore, it is possible to suppress suction bad, play consistently the ability of pump.In a comparative example, the second opening portion 11 is plugged entirely, and therefore a part for bubble is discharged from exhaust port 14.In addition we know, even if the air of embodiment 1 injection about ten times compared with comparative example, the ability that also inhibits pump reduces.In a comparative example, if maximum air Injection amount (L/min) is more than 0.8 (L/min), then discharges pressure (m) and significantly reduce.
Next, the second performance test is described.Second performance test utilizes has that discharge capacity is 100L/min, total head is 10m, rotating speed is 2900min
-1and output power of motor is that the centrifugal pump of the performance of 3.7kW has carried out above-mentioned air Injection test.Illustrate its result in fig. 13.When carrying out air Injection test, because the example shown in the size of tank tank, tank tank with the configuration of centrifugal pump, the connecting means of pipe arrangement and above-mentioned Figure 10 is identical, therefore omit the description.
Figure 12 is the sectional view that the his-and-hers watches half-section be shown on the pump width direction of the overview of the head used in the second performance test carries out representing.As shown in figure 12, pump head 6F is combination shell 600 and inhalation mask 610 and being formed.Shell 600 is formed the second opening portion 11b and exhaust port 12d.Inhalation mask 610 is formed the first opening portion 10, second opening portion 11, second row outlet 70, exhaust port 12b, exhaust port 12c and exhaust port 12e.The diameter of exhaust port 12b, exhaust port 12c, exhaust port 12d and exhaust port 12e is d1.Further, as shown in figure 12, pipe arrangement 17a and L-type pipe arrangement 16a is installed in the second opening portion 11b, to air, discharges bubble from the exhaust port 29 of L-type pipe arrangement 16a.Closed second row outlet 70 is carried out by being screwed into connector 30.First opening portion 10 is formed at four positions on plane 61a, and by the gap-forming of 90 ° the diameter centered by the centre line C L of axle 3 for D1 circumferentially.Exhaust port 12b, exhaust port 12c, exhaust port 12d and exhaust port 12e are respectively formed with four.In inhalation mask 610, the path 12 of discharging bubble from the first opening portion 10 to the second opening portion 11 is four, and the path 12 of discharging bubble via the second opening portion 11b to exhaust port 29 from the first opening portion 10 is four.In addition, exporting 70 paths 12 of discharging bubble from the first opening portion 10 to second row is four.The diameter D1 of the center C1 of the first opening portion 10 is 90mm, and the diameter d 1 of path is 11mm.In addition, the diameter D of impeller 5 is 135mm, and the diameter Ds of the starting point of the blade 51 of impeller 5 (link the end of centre line C L side and the circle that obtains) is 70mm.
Embodiment 1 makes bubble only from the example that the exhaust port 29 of L-type pipe arrangement 16a is discharged.Embodiment 2 makes bubble only from the example that the second opening portion 11 is discharged.Comparative example is the example of the second opening portion 11, exhaust port 29 and second row outlet 70 being closed.Conventional example only offers the example of second row outlet 70.When implementing conventional example, comparative example, embodiment 1 and embodiment 2, carry out closed second opening portion 11, exhaust port 29 and second row outlet 70 by installing connector 30.
Test identical with the air Injection in the first performance test, air Injection test in second performance test is also by making centrifugal pump 1A operate with 50Hz, utilize valve 28 by Flow-rate adjustment to 50L/min after valve 28 is fixed, utilize frequency variator that the rotating speed of motor is adjusted to 50Hz with the interval of 5Hz from 30Hz, utilize air compressor injection air to carry out by Air flow meter.The measurement of discharging pressure (m) is also identical with the method for carrying out in the first performance test measuring.Represent its result in fig. 13.
Identical with the first performance test, be also with frequency (rotating speed) for benchmark makes centrifugal pump 1A operate in the second performance test, therefore the presence or absence of path also causes discharge pressure (m) to change.Therefore, in the second performance test, identical with the first performance test, the performance evaluation of centrifugal pump is also the reduction of discharging pressure (m) for maximum air Injection amount (L/min) research evaluation.That is, represent that maximum air Injection amount (L/min) is more and to discharge the reduction of pressure (m) less, then more effective, as long as it is just effective below to discharge pressure being reduced to of (m) 1.0 (m).In embodiments of the present invention that is embodiment 1 and embodiment 2, even if maximum air Injection amount (L/min) is 13.0 maximum (L/min), discharge the reduction of pressure (m) also at 1.0 (m) below.
In addition, in embodiment 1, can confirm by visual the situation that bubble and liquid are discharged from exhaust port 29.In example 2, can confirm when discharging bubble from the second opening portion 11 by visual, the situation that bubble rises to liquid level.In a comparative example, exhaust port 29, second opening portion 11 and second row outlet 70 are plugged entirely, and therefore a part for bubble is discharged from exhaust port.The result of comparing embodiment 1, embodiment 2 and comparative example is known, and compared with the result of comparative example, the result of embodiment 1 and embodiment 2 is better.In addition we know, even if embodiment 1 injects the air of about twice compared with comparative example, the ability that also inhibits pump reduces.And compared with conventional example, embodiment 1 inhibits the bubble be discharged again to flow into from suction port.In addition, dissolved gases amount because of bubble to the water surface float and in air release and reduce.Consequently, suction can be suppressed bad, play consistently the ability of pump.In a comparative example, if maximum air Injection amount (L/min) is more than 3.0 (L/min), then discharges pressure (m) and significantly reduce.
Claims (10)
1. a centrifugal pump, is characterized in that, comprising:
Suction port, it sucks fluid;
Impeller, it at least has multiple blade in described suction port side, and sucks described fluid by carrying out rotating centered by the axle of the regulation through described suction port from described suction port, discharges described fluid to the direction orthogonal with described axle;
Pump head, it has described suction port, and receives described impeller;
First opening portion, it is opened in the position opposed with described multiple blade of described suction port side of described pump head;
Second opening portion, it is opened in the position at least one direction being present in the direction orthogonal with described axle and the direction contrary with described suction port side of described pump head;
Path, described first opening portion is connected with described second opening portion by it.
2. centrifugal pump according to claim 1, is characterized in that,
Described path is more than two less than ten.
3. centrifugal pump according to claim 1 and 2, is characterized in that,
The diameter of a circle obtained in the end of the internal side diameter of the described blade by linking described impeller is set to Ds, and when the diameter of described impeller is set to D, described first opening portion is opened in the scope of more than 1.0Ds below 1.0D centered by described axle.
4. centrifugal pump according to claim 1 and 2, is characterized in that,
The cross section orthogonal with its bearing of trend of described path is circular, and the diameter in described cross section is less than more than 10% 50% relative to the diameter of the exhaust port of discharging described fluid.
5. centrifugal pump according to claim 4, is characterized in that,
The cross section orthogonal with its bearing of trend of described path is circular, and the diameter in described cross section is less than more than 10% 50% relative to the diameter of the exhaust port of discharging described fluid.
6. a centrifugal pump, is characterized in that, comprising:
Suction port, it sucks fluid;
Impeller, it at least has multiple blade in described suction port side, and sucks described fluid by carrying out rotating centered by the axle of the regulation through described suction port from described suction port, discharges described fluid to the direction orthogonal with described axle;
Pump head, it has described suction port, and receives described impeller;
First opening portion, it is opened in the position opposed with described multiple blade of described suction port side of described pump head;
Second opening portion, it is opened in the position be present on the direction orthogonal with described axle of described pump head;
Path, described first opening portion is connected with described second opening portion by it.
7. centrifugal pump according to claim 6, is characterized in that,
Described path is more than two less than ten.
8. the centrifugal pump according to claim 6 or 7, is characterized in that,
The diameter of a circle obtained in the end of the internal side diameter of the described blade by linking described impeller is set to Ds, and when the diameter of described impeller is set to D, described first opening portion is opened in the scope of more than 1.0Ds below 1.0D centered by described axle.
9. the centrifugal pump according to claim 6 or 7, is characterized in that,
The cross section orthogonal with its bearing of trend of described path is circular, and the diameter in described cross section is less than more than 10% 50% relative to the diameter of the exhaust port of discharging described fluid.
10. centrifugal pump according to claim 9, is characterized in that,
The cross section orthogonal with its bearing of trend of described path is circular, and the diameter in described cross section is less than more than 10% 50% relative to the diameter of the exhaust port of discharging described fluid.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-137373 | 2013-06-28 | ||
| JP2013137373A JP6088918B2 (en) | 2013-06-28 | 2013-06-28 | Centrifugal pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104251214A true CN104251214A (en) | 2014-12-31 |
| CN104251214B CN104251214B (en) | 2017-09-01 |
Family
ID=52186397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410286913.4A Active CN104251214B (en) | 2013-06-28 | 2014-06-24 | Centrifugal pump |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6088918B2 (en) |
| KR (1) | KR101742355B1 (en) |
| CN (1) | CN104251214B (en) |
| HK (1) | HK1204353A1 (en) |
| TW (1) | TWI572781B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0298949A2 (en) * | 1987-07-06 | 1989-01-11 | Kamyr Ab | Combined fluidizing and vacuum pump |
| JPH05113200A (en) * | 1991-10-22 | 1993-05-07 | Mitsubishi Heavy Ind Ltd | Gas/liquid two-phase fluid pump |
| DE4325549C3 (en) * | 1993-07-29 | 1997-04-24 | Brinkmann Pumpen K H Brinkmann | Centrifugal pump |
| CN103124852A (en) * | 2010-09-27 | 2013-05-29 | 安德里特斯公开股份有限公司 | Centrifugal pump |
| CN103122860A (en) * | 2013-03-06 | 2013-05-29 | 新昌德力石化设备有限公司 | Internal exhausting liquid ring type self-priming centrifugal pump |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6331281U (en) * | 1986-08-13 | 1988-02-29 | ||
| TWI274106B (en) * | 2005-06-10 | 2007-02-21 | Delta Electronics Inc | Centrifugal pump with air venting design |
| DE102006016199A1 (en) * | 2006-04-06 | 2007-10-11 | Alfa Laval Kolding A/S | Self-venting centrifugal pump |
| KR101251504B1 (en) * | 2010-12-03 | 2013-04-05 | 현대자동차주식회사 | Oil pump system for automatic transmission |
-
2013
- 2013-06-28 JP JP2013137373A patent/JP6088918B2/en active Active
-
2014
- 2014-03-03 TW TW103107089A patent/TWI572781B/en active
- 2014-06-20 KR KR1020140075669A patent/KR101742355B1/en active IP Right Grant
- 2014-06-24 CN CN201410286913.4A patent/CN104251214B/en active Active
-
2015
- 2015-05-21 HK HK15104844.3A patent/HK1204353A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0298949A2 (en) * | 1987-07-06 | 1989-01-11 | Kamyr Ab | Combined fluidizing and vacuum pump |
| JPH05113200A (en) * | 1991-10-22 | 1993-05-07 | Mitsubishi Heavy Ind Ltd | Gas/liquid two-phase fluid pump |
| DE4325549C3 (en) * | 1993-07-29 | 1997-04-24 | Brinkmann Pumpen K H Brinkmann | Centrifugal pump |
| CN103124852A (en) * | 2010-09-27 | 2013-05-29 | 安德里特斯公开股份有限公司 | Centrifugal pump |
| CN103122860A (en) * | 2013-03-06 | 2013-05-29 | 新昌德力石化设备有限公司 | Internal exhausting liquid ring type self-priming centrifugal pump |
Also Published As
| Publication number | Publication date |
|---|---|
| HK1204353A1 (en) | 2015-11-13 |
| KR20150002480A (en) | 2015-01-07 |
| TW201502380A (en) | 2015-01-16 |
| CN104251214B (en) | 2017-09-01 |
| KR101742355B1 (en) | 2017-05-31 |
| JP2015010566A (en) | 2015-01-19 |
| TWI572781B (en) | 2017-03-01 |
| JP6088918B2 (en) | 2017-03-01 |
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