CN207297382U - Small pump and small pump pump group - Google Patents
Small pump and small pump pump group Download PDFInfo
- Publication number
- CN207297382U CN207297382U CN201721251975.7U CN201721251975U CN207297382U CN 207297382 U CN207297382 U CN 207297382U CN 201721251975 U CN201721251975 U CN 201721251975U CN 207297382 U CN207297382 U CN 207297382U
- Authority
- CN
- China
- Prior art keywords
- impeller
- pump
- small pump
- armature spindle
- bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model provides a kind of small pump and small pump pump group, it includes：Housing, is sequentially connected in series and is formed by end cap, multistage first stage casing and changeover portion, multistage second stage casing, suction casing；The rotor part being placed in housing, including armature spindle and two groups of impellers being placed on armature spindle, impeller in the first impeller sets towards with the impeller in the second impeller sets towards on the contrary, being equipped with guide vane at every impeller in two groups of impellers；All first stage casings correspond with the impeller in the first impeller sets and set, all second stage casings correspond with the impeller in second group and set, armature spindle between first impeller sets and the second impeller sets corresponds to the changeover portion and is equipped with water lubriucated bearing between the two, one end of the armature spindle is placed in the end cap and is equipped with water lubriucated bearing between the two, the other end of the armature spindle is stretched out from the suction casing, and suction casing is equipped with mechanical sealing assembly with rotor between centers.The utility model is compact-sized, efficient.
Description
Technical field
Water pump technology is the utility model is related to, more particularly to a kind of small pump and small pump pump group.
Background technology
Small pump is one of capital equipment of chemistry and volume control system (CVS) in AP1000 nuclear power plants auxiliary plant.
Its major function is as follows：1st, moisturizing is provided to reactor coolant loop (RCS)；2nd, the water of (maintenance) reactor coolant is changed
Chemical characteristic and RCS loading amounts；3rd, if desired for when, eliminate voltage-stablizer vapor bubbles in power plant shutdown final stage and voltage-stablizer be provided
Assistant spray.
The technical bottleneck of the pump mainly has following：1st, CVS small pumps are small flow, high-lift, low-specific-speed multistage centrifugal
Pump, it is desirable to which performance curve is smooth to be declined without hump, and it is larger that waterpower researches and develops difficulty.2nd, water pump series is more, pump group operation stability
More difficult control, structure design difficulty are larger.
Small pump generally has following structure type at present：Form one, using unshrouded impeller, prismatic blade, impeller unidirectional cloth
The structure type with both ends rolling bearing is put, major defect is that unshrouded impeller efficiency is low, and axial force is larger, is unfavorable for the length of pump
Phase is run；Form two, using double shrouded wheel, impeller is unidirectionally arranged, balancing frame balancing axial thrust, the structure shape of both ends rolling bearing
Formula, main deficiency is curve there are hump, axial force to change greatly in changes in flow rate, and thrust bearing temperature rise is larger,
It is unfavorable for the longtime running of pump；Form three, using double shrouded wheel, impeller is arranged symmetrically, and thrust bearing is forced using sliding bearing
Water lubriucated bearing and oil-lubricated bearing is respectively adopted in lubrication, journal bearing, and water lubriucated bearing uses metal material, self-lubricating property
Difference, start and stop are easily engaged and wear, and thrust bearing need to configure petrol station forced feed lubrication, and system configuration is complex.
Therefore, it is necessary to a kind of small pump simple and compact for structure, efficient, good operation stability.
Utility model content
In view of the foregoing deficiencies of prior art, the purpose of this utility model is to provide a kind of small pump and moisturizing
Pump group is pumped, for solving the problems, such as that small pump is complicated in the prior art, efficiency is low.
In order to achieve the above objects and other related objects, the utility model provides a kind of small pump, it includes：
Housing, is sequentially connected in series and is formed by end cap, multistage first stage casing and changeover portion, multistage second stage casing, suction casing；
The rotor part being placed in housing, including armature spindle and two groups of impellers being placed on armature spindle, the first impeller sets
In impeller towards with the impeller in the second impeller sets towards on the contrary, being equipped with guide vane at every impeller in two groups of impellers；
All first stage casings correspond with the impeller in the first impeller sets and set, in all second stage casings and second group
Impeller, which corresponds, to be set, and the armature spindle between the first impeller sets and the second impeller sets corresponds to the changeover portion and is equipped with water between the two
Lubricate bearing, one end of the armature spindle is placed in the end cap and is equipped with water lubriucated bearing between the two, the armature spindle it is another
One end is stretched out from the suction casing, and suction casing is equipped with mechanical sealing assembly with rotor between centers.
Preferably, first impeller sets are equipped with eight impellers, and second impeller sets are equipped with five impellers.
Preferably, it is equipped with seal between the impeller in first impeller sets and corresponding first stage casing, described second
Impeller in impeller sets between corresponding second stage casing with being equipped with seal.
Preferably, the seal is the sealing ring of surface irregularity.
Preferably, the guide vane and the rotor between centers are equipped with guide blade sleeve.
Preferably, the guide blade sleeve is made of graphite material.
Preferably, outer barrel is further included, the housing is placed in outer barrel with the rotor part, and armature spindle is another
End is connected by oil-lubricated bearing component with the outer barrel.
Preferably, the outer barrel is the tubular element being connected to form by pump cover, the pump housing, and the end cap is located at the pump cover
Interior, the oil-lubricated bearing component is connected with the pump housing.
Preferably, the oil-lubricated bearing component includes the support of bearing, angular contact bearing and grease-box, grease-box
Be fixedly linked and surround the lubricating cavity for accommodating angular contact bearing with the support of bearing.
The utility model provides a kind of small pump pump group, it includes motor, shaft coupling and small pump as described above, institute
The motor shaft for stating motor is connected by shaft coupling with the armature spindle of the small pump.
Preferably, the shaft coupling is diaphragm coupling.
Preferably, the small pump is arranged in support base, and the motor is arranged on motor cabinet, the armature spindle with
The motor shaft of the motor is coaxially disposed.
As described above, the small pump and moisturizing pump group of the utility model, have the advantages that：Using being set on armature spindle
Two groups of impellers reversely installed are put, axial force when being rotated with this part impeller that can cancel out each other, reduces axial force, rotor portions
Part is by pulling force；In addition its rigidity of the armature spindle that this kind is set is good；The changeover portion of armature spindle and housing between two groups of impellers passes through water
Lubrication bearing is connected, and improves the stability of armature spindle rotation, and one end of armature spindle is embedded in end cap and uses water lubrication
Bearing, namely the utility model are supported using two water lubriucated bearings and one group of oil-lubricated bearing component, oil-lubricated bearing
Bearing in component is the angular contact ball bearing of thin oil self-lubricating, and water lubriucated bearing need not add cooling and lubricating pipeline, oil bearing
Without external cooling, and self-circulation lubricating, the structure of whole small pump is simplified, is realized without directly initiating in the case of prelubricated
Pump.
Brief description of the drawings
The small pump one that Fig. 1 is shown as the utility model implements illustration.
Fig. 2 is shown as the structure diagram of the rotor part of the utility model.
Fig. 3 is shown as another implementation illustration of the small pump of the utility model.
Fig. 4 is shown as the outer barrel structure diagram of the utility model.
Fig. 5 is shown as the schematic diagram of the oil-lubricated bearing component of the utility model.
Fig. 6 is shown as the schematic diagram of the small pump pump group of the utility model.
Component label instructions
1 pump cover
2 connection bolts
3 water lubriucated bearings
4 end caps
5 guide vanes
6 first stage casings
7 pump housings
8 seals
9 guide blade sleeves
10 changeover portions
11 suction casings
12 mechanical seals
13 angular contact bearings
14 grease-boxs
15 gas block up
16 pads
17 discs
18 supports of bearing
19 axle sleeves
20 keys
21 impellers
22 axle sleeves
23 armature spindles
24 nuts
25 second stage casings
100 first impeller sets
200 second impeller sets
400 small pumps
500 shaft couplings
600 motors
700 support bases
800 motor cabinets
Embodiment
Illustrate the embodiment of the utility model by particular specific embodiment below, those skilled in the art can be by this
Content disclosed by specification understands other advantages and effect of the utility model easily.
Please refer to Fig.1 to Fig. 6.It should be clear that structure depicted in this specification institute attached drawing, ratio, size etc., only to
Coordinate the revealed content of specification, so that those skilled in the art understands and reads, be not limited to the utility model
Enforceable qualifications, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or size
Adjustment, in the case where not influencing the effect of the utility model can be generated and the purpose that can reach, should all still fall in the utility model
In the range of revealed technology contents can be covered.Meanwhile in this specification it is cited as " on ", " under ", " left side ",
The term on " right side ", " centre " and " one " etc., is merely convenient to understanding for narration, and it is enforceable to be not used to restriction the utility model
Scope, its relativeness are altered or modified, enforceable when being also considered as the utility model in the case where changing technology contents without essence
Category.
As shown in Figure 1, the utility model provides a kind of small pump, it includes：
Housing, is gone here and there successively by end cap 4, multistage first stage casing 6 and changeover portion 10, multistage second stage casing 25, suction casing 11
Connect and form；
The rotor part being placed in housing, as shown in Figure 2, including armature spindle 23 and two groups of leaves being placed on armature spindle 23
Wheel, impeller 21 in the first impeller sets 100 towards with the impeller 21 in the second impeller sets 200 towards on the contrary, in two groups of impellers
Guide vane 5 is equipped with every impeller 21；
Impeller 21 in all first stage casing, 6 and first impeller sets 100, which corresponds, to be set, all second stage casings 25 and the
Impeller 21 in two impeller sets 200, which corresponds, to be set, and the armature spindle 23 between the first impeller sets 100 and the second impeller sets 200 is right
Answer the changeover portion 10 and be equipped with water lubriucated bearing 3 between the two, one end of the armature spindle 23 is placed in the end cap 4 and both
Between be equipped with water lubriucated bearing 3, the other end of the armature spindle 23 is stretched out from the suction casing 11, and suction casing 11 is set with rotor between centers
There is mechanical sealing assembly.
The utility model on armature spindle 23 using two groups of impellers reversely installed are set, with this part impeller that can cancel out each other
Axial force during 21 rotation, reduces axial force；In addition its good, rotor part tension of rigidity of the armature spindle 23 that this kind is set
It is good；Armature spindle 23 between two groups of impellers 21 is connected with the changeover portion 10 of housing by water lubriucated bearing 3, improves 23 turns of armature spindle
Dynamic stability, one end of armature spindle 23 are embedded in end cap 4 and also use water lubriucated bearing 3, namely the utility model to adopt
It is supported with two water lubriucated bearings 3, water lubriucated bearing 3 need not add cooling and lubricating pipeline, simplify whole small pump
Structure, is realized without directly initiating pump in the case of prelubricated.
As shown in Fig. 2, the first impeller sets 100 are equipped with eight impellers 21 in the present embodiment, eight impellers 21 are towards armature spindle
23 left end installation, second impeller sets 200 are equipped with five impellers 21, and the right end of five impellers towards armature spindle 23 is installed,
Every impeller 21 is fixedly linked by key 20 and the armature spindle 23, and impeller in the second impeller sets offsets the in the present embodiment
The axial force of part impeller in one impeller sets, reduces the axial force of whole rotor part with this；The present embodiment rotor part
Critical speed is more than more than the 125% of pump rated speed, belongs to rigid rotator.The first stage casing 6 has eight sections in the present embodiment, and the
Two stage casings 25 have five sections, and end cap 4, all first stage casings are connected with changeover portion 10 by stay bolt, in changeover portion, all second
Section and suction casing are fixedly linked by stay bolt, and one end of armature spindle 23 is embedded in end cap 4, solid by nut 24 and end cap 4
Fixed to be connected, the other end, which stretches out, is used as drive end, forms the rotor part that single shaft is stretched, and by setting changeover portion 10 and armature spindle 23
It is connected by water lubriucated bearing 3, i.e., support is set in the center section of armature spindle 23, improves the slow-roll stabilization of armature spindle 23
Property, improves the rigidity of armature spindle 23, and armature spindle one end is buried, and it is used water lubriucated bearing, and water lubriucated bearing 3 need not
External lubricating pipe, reduces the parts of small pump.In the present embodiment between water lubriucated bearing 3 and armature spindle 23 be equipped with axle sleeve 19,
22。
To increase structural compactness, improve efficiency, the impeller 21 in the present embodiment in the first impeller sets 100 with it is corresponding described in
It is equipped with seal 8 between first stage casing 6, the impeller 21 in second impeller sets 200 between corresponding second stage casing 25 with being equipped with
Seal 8.Preferably, seal 8 is the sealing ring of surface irregularity, its rough surface itself has water resistance,
Reach better seal effect, also more improve efficiency.
The present embodiment is equipped with guide blade sleeve 9 between guide vane 5 and the armature spindle 23, it is preferred that guide blade sleeve 9 uses graphite material
It is made, it meets water with slip is moistened to guide blade sleeve made of graphite material, reduces axial force, improves the efficiency of small pump.
As another embodiment of the small pump of the utility model, as shown in Figure 1, the present embodiment is double-shell pump, its
On the basis of above-mentioned small pump, outer barrel is further included, the housing is placed in outer barrel with the rotor part, and armature spindle 23
The other end stretched out from suction casing 11, be connected equipped with mechanical seal 12, then by oil-lubricated bearing component with the outer barrel.This
The small pump of embodiment is double Shell, its outer barrel is as pressure parts.
Preferably to remove and install, in order to repair, as shown in Figure 4, the outer barrel in the present embodiment is by pump cover 1, pump
The tubular element that body 7 is connected to form, the end cap are located in the pump cover 1, the oil-lubricated bearing component and 7 phase of the pump housing
Even.For the entirety for forming above-mentioned housing, rotor part in the present embodiment as core pack assembly, it can be by opening pump cover 1, directly
Connect to take out core pack assembly and overhauled.Pump cover 1 is connected with the pump housing 7 by being connected bolt 2 in the present embodiment, it uses middle branch
Support mode, suction inlet and discharge opening are set vertically upward.
As shown in figure 5, oil-lubricated bearing component includes the support of bearing 18, angular contact bearing 13 and lubrication in the present embodiment
Fuel tank 14, grease-box 14 and the support of bearing 18 are fixedly linked and surround the lubricating cavity for accommodating angular contact bearing 14, in lubricating cavity
Full of lubricating oil, shaft is equipped with disc 17；To ensure that lubricating oil is not contaminated and reveals, the present embodiment is in supporting rack with turning
Sub- between centers, grease-box and rotor between centers are equipped with pad 16.To stablize the pressure of lubricating oil, it is equipped with and deflates on grease-box
Hole, air vent is interior to block up 15 equipped with gas.To cool down lubricating oil, the present embodiment directly realizes the cold of lubricating oil using air-cooled pattern
But.
As shown in fig. 6, the utility model also provides a kind of small pump pump group, it include motor 600, shaft coupling 500 and
Small pump 400 as described above, the small pump in the present embodiment are the above-mentioned bivalve small pump containing outer barrel, the motor
600 motor shaft is connected by shaft coupling 500 with the armature spindle of the small pump 400.The present embodiment can not dismantle motor,
In the case of pumping the import and export pipeline, by above-mentioned core pack assembly, that is, housing and rotor part extraction, installation and maintenance；In addition, this reality
It is small to apply the small pump of example its axial force, it is efficient, it is compact-sized.
In the present embodiment, the end that armature spindle is connected with motor is drive end, and the design bearing of drive end is using above-mentioned glossy
Slide-bar bearing assembly, using the air-cooled structure of rare self-lubricating, may not need it is prelubricated in the case of quickly start.Using back-to-back peace
The angular contact bearing of dress bears the axial force and partially radially power of armature spindle.Axle envelope uses labyrinth sealing.As shown in Figure 5, it is oily
Oil ga(u)ge of the bearing assembly equipped with observation oil level is lubricated, stablizes the lubricating cup of oil level, promote the disc 17 of lubricating oil flow.Engagement shaft
14 exterior setting large tank, i.e., above-mentioned grease-box 14 are held, and arranges radiating rib plate, without exterior cooling water.
Drive end is sealed using mechanical seal 12, and as shown in Figure 3, mechanical seal 12 is balanced type, single end face, more bullets
Spring, integrated mechanical sealing.Rotating ring and static ring material are graphite/SiC.When the projected life of mechanical seal is small more than 15000.
Small pump 400 is connected with motor 600 using diaphragm coupling in the present embodiment, middle node of the centre equipped with lengthening,
The mating surface of armature spindle 23 and shaft coupling 500 uses cone match, to ensure be in close contact in whole length of fit, together
When be also convenient for safeguard；Shaft coupling 500 is equipped with matched indicia to guarantee correctly to assemble.
To reduce the vibratility of whole small pump pump group, small pump 400 is arranged in support base 700 in the present embodiment,
The motor 600 is arranged on motor cabinet 800, and the motor shaft of the armature spindle 23 and the motor 600 is coaxially disposed.
In conclusion the small pump and moisturizing pump group of the utility model, 1) using the above-mentioned seal 8 of setting, guide blade sleeve
9th, the water lubriucated bearing 3 among armature spindle, improves the efficiency of pump, highly reliable；2) stretched using single shaft, Single Mechanical seals (only
There is mechanical seal in drive end), Drawing-Core structure, it is easy to maintenance；Medium design water lubriucated bearing 3, two groups of impellers it is reverse
Arrangement balances predominantly axially power, armature spindle is in tension state, pump vibration is small, operates steadily.3) drive end of armature spindle
Using the angular contact bearing 14 with air-cooled structure, anti-drive end employs water lubriucated bearing 3, realizes no pre-lubrication and plays pump,
Simplify system configuration；4) guide blade sleeve selects high intensity, good heat conductivity, heat safe carbon graphite material；Seal 8 is using recessed
Convex uneven surface design；Make small pump that there is good anti-occlusion, abrasive resistance.So the utility model effectively overcomes
Various shortcoming of the prior art and have high industrial utilization.
The above embodiments are only illustrative of the principle and efficacy of the utility model, new not for this practicality is limited
Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the revealed essence of the utility model
God and all equivalent modifications completed under technological thought or change, should be covered by the claim of the utility model.
Claims (12)
- A kind of 1. small pump, it is characterised in that including：Housing, is sequentially connected in series and is formed by end cap, multistage first stage casing and changeover portion, multistage second stage casing, suction casing；The rotor part being placed in housing, including armature spindle and two groups of impellers being placed on armature spindle, in the first impeller sets Impeller towards with the impeller in the second impeller sets towards on the contrary, being equipped with guide vane at every impeller in two groups of impellers；All first stage casings correspond with the impeller in the first impeller sets and set, all second stage casings and the impeller in second group Correspond and set, the armature spindle between the first impeller sets and the second impeller sets corresponds to the changeover portion and is equipped with water lubrication between the two Bearing, one end of the armature spindle are placed in the end cap and are equipped with water lubriucated bearing, the other end of the armature spindle between the two Stretched out from the suction casing, suction casing is equipped with mechanical sealing assembly with rotor between centers.
- 2. small pump according to claim 1, it is characterised in that：First impeller sets are equipped with eight impellers, and described Two impeller sets are equipped with five impellers.
- 3. small pump according to claim 1, it is characterised in that：Impeller and corresponding described in first impeller sets It is equipped with seal between one stage casing, the impeller in second impeller sets between corresponding second stage casing with being equipped with seal.
- 4. small pump according to claim 3, it is characterised in that：The seal is the sealing ring of surface irregularity.
- 5. small pump according to claim 1, it is characterised in that：The guide vane and the rotor between centers are equipped with guide blade sleeve.
- 6. small pump according to claim 5, it is characterised in that：The guide blade sleeve is made of graphite material.
- 7. according to claim 1 to claim 6 any one of them small pump, it is characterised in that：Outer barrel is further included, it is described Housing is placed in outer barrel with the rotor part, and the other end of armature spindle passes through oil-lubricated bearing component and the outer barrel It is connected.
- 8. small pump according to claim 7, it is characterised in that：The outer barrel is connected to form by pump cover, the pump housing Tubular element, the end cap are located in the pump cover, and the oil-lubricated bearing component is connected with the pump housing.
- 9. small pump according to claim 7, it is characterised in that：The oil-lubricated bearing component includes the support of bearing, angle Contact bearing and grease-box, grease-box and the support of bearing are fixedly linked and surround the lubricating cavity for accommodating angular contact bearing.
- A kind of 10. small pump pump group, it is characterised in that：Including motor, shaft coupling and small pump as claimed in claim 7, The motor shaft of the motor is connected by shaft coupling with the armature spindle of the small pump.
- 11. small pump pump group according to claim 10, it is characterised in that：The shaft coupling is diaphragm coupling.
- 12. small pump pump group according to claim 10, it is characterised in that：The small pump is arranged in support base, The motor is arranged on motor cabinet, and the motor shaft of the armature spindle and the motor is coaxially disposed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721251975.7U CN207297382U (en) | 2017-09-27 | 2017-09-27 | Small pump and small pump pump group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721251975.7U CN207297382U (en) | 2017-09-27 | 2017-09-27 | Small pump and small pump pump group |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207297382U true CN207297382U (en) | 2018-05-01 |
Family
ID=62440845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721251975.7U Active CN207297382U (en) | 2017-09-27 | 2017-09-27 | Small pump and small pump pump group |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207297382U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107542670A (en) * | 2017-09-27 | 2018-01-05 | 上海阿波罗机械股份有限公司 | Small pump and small pump pump group |
-
2017
- 2017-09-27 CN CN201721251975.7U patent/CN207297382U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107542670A (en) * | 2017-09-27 | 2018-01-05 | 上海阿波罗机械股份有限公司 | Small pump and small pump pump group |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8513847B2 (en) | Thrust balancing device for cryogenic fluid machinery | |
| US20130129488A1 (en) | Foil bearing supported motor-driven blower | |
| CN104179712A (en) | Air suspension centrifugal blower | |
| CN103225624A (en) | Double-casing symmetric type radial subdivision multiple-stage centrifugal pump | |
| US9376938B2 (en) | Waste heat power generator | |
| CN108266379A (en) | The double-impeller pump of symmetrical impeller arrangement | |
| CN211116145U (en) | ORC circulation system based on static pressure air bearing | |
| CN207297382U (en) | Small pump and small pump pump group | |
| CN203214340U (en) | Double-shell symmetric radially-split multistage centrifugal pump | |
| CN110374892A (en) | A kind of centrifugal two-stage air compressor of high-speed direct-drive | |
| CN207920880U (en) | The double-impeller pump of symmetrical impeller arrangement | |
| CN2784625Y (en) | Improved hot-water circulating pump | |
| US20120034067A1 (en) | Turbocompressor and System for a Supercritical-Fluid Cycle | |
| CN115370595A (en) | Bilateral self-suction cooling double-impeller air-floatation high-speed direct-drive centrifugal blower and working method | |
| CN107542670A (en) | Small pump and small pump pump group | |
| CN103115018B (en) | A kind of lubrication of pipeline pump bearing unit and cooling mechanism | |
| CN202483894U (en) | Magnetic pump with impurity dry-running function | |
| CN107725113B (en) | Two-stage cantilever type axial flow expander | |
| CN204610295U (en) | Vertical low temperature centrifugal pump | |
| US10718345B2 (en) | Air compressor or water pump | |
| CN204003584U (en) | A kind of air suspension centrifugal blower | |
| CN210218158U (en) | Air suspension centrifugal vacuum pump | |
| CN209875479U (en) | Coaxial symmetrically-arranged multistage hydraulic turbine direct-drive pump | |
| CN113294359A (en) | High-performance unilateral double-impeller magnetic suspension high-speed direct-drive turbo compressor and working mechanism | |
| CN207333273U (en) | Emergency feedwater pumps |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |