CN2646424Y - High pressure self balancing segment type centrifugal pump - Google Patents
High pressure self balancing segment type centrifugal pump Download PDFInfo
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- CN2646424Y CN2646424Y CN 03235051 CN03235051U CN2646424Y CN 2646424 Y CN2646424 Y CN 2646424Y CN 03235051 CN03235051 CN 03235051 CN 03235051 U CN03235051 U CN 03235051U CN 2646424 Y CN2646424 Y CN 2646424Y
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- high pressure
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- sealing
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Abstract
The utility model relates to a high pressure self balancing segment type centrifugal pump. The pump makes the impeller rotor members with the symmetrical arrangement organically combined with the segment type of a shell body. A combined seal composed of a multi-stage non-contact type spiral seal and a pulpy calking sealing of novel composite material is adopted; therefore, on the basis of keeping the wide regulation range of the performance parameter of the segment type multi-stage pump, the huge axial thrust in a pump chamber is achieved for automatic balance without adopting a balance disc structure or a balancing drum structure. Through the novel combined seal, the less leak is achieved during transporting the press solid, liquid and gas three-phase flow medium, and the effect of the maintenance without stopping of the shaft seal is realized.
Description
Technical field
The utility model relates to a kind of pump, particularly relate to and a kind ofly can satisfy occasion requirements such as steel mill's dephosphorize by high pressure water, high oil field water injection and crude oil exporting, in the operating conditions frequent variations, should have high reliability when carrying solid-liquid two-phases such as non-clean re-injection water and turbid circulating water to have the former wet goods three-phase flow medium of the medium of certain corrosion or moisture, gas and sand grains, not have and leak and the high pressure self balancing segmental centrifugal pump of the continuous roadability of long period.
Background technique
At present, high-pressure multi-stage centrifugal pump structure form is mainly sectional type, voluted type and two shell type three major types.
Sectional type high-pressure multi-stage centrifugal pump is representative with boiler feed pump and derivatives thereof, the main operating conditions occasion stably that is suitable for, because its multi-stage impeller is disposed in order by same direction, the axial force that produces during operation is up to tens of tons, must carry out balance by Balance disc mechanism, and Balance disc mechanism is when being not enough to balancing axial thrust, and all the other axial forces are then born by angular contact ball bearing.When the operating conditions frequent variations, the variation of axial force must cause the frequent play of pump rotor parts and usually make Balance disc that the moment friction takes place, even occurs killing because of Balance disc and cause breaking axis to take place.In order to reduce the hidden danger that Balance disc is killed, it is spacing to adopt angular contact ball bearing to carry out, and bears the residue axial force, but causes the transient equiliblium function limitation system of Balance disc.Therefore, the mutual interference when the operating conditions frequent variations of the type pump Balance disc and angular contact ball bearing is to cause under the part service condition, the lethal factor of both weak points in working lifes and poor reliability.Simultaneously, the sectional type multistage pump adopts component such as fastening its water inlet-outlet segment of several whole turnbuckles and stage casing usually, turnbuckle bears the pulling force that whole impeller pressure differences are produced, when impeller progression more, when pumping pressure is higher, the turnbuckle diameter has to strengthen, and causes the boundary dimension of pump to increase.
The voluted type multistage centrifugal pump can have the impeller rotor part of symmetric arrangement, and the axial force that impeller at different levels is produced is cancelled out each other, and need not adopt Balance disc or balancing drum structure just can realize that huge end thrust reaches autobalance in the pump chamber.This pump case is generally in the level to be opened, owing to consider the symmetric arrangement of impeller, its inner flow passage is very complicated, and the manufacturability of shell casting is poor.This pump can not be according to the variation increase and decrease impeller progression of pressure, and its performance Applicable scope is limited to.Two shell type high-pressure multi-stage centrifugal pumps increase rigid canister in the outside of voluted type housing, make pump can bear higher pressure, and its structural feature and accommodation are similar to the voluted type multistage pump, but the manufacture cost height generally is used for special occasions.
High-pressure multi-stage centrifugal pump sealing kind is mainly mechanical seal, spiral seal and packing seal etc.For occasions such as steel mill's dephosphorize by high pressure water, high oil field water injection and crude oil exportings, the combination of high-pressure multi-stage centrifugal pump is as needing the long period key equipment of operation continuously, because of pump load frequent variations, medium both had been the solid-liquid two-phase flow body, may contain simultaneously gases such as rock gas, above-mentioned sealing and combination thereof all exist reliability to be difficult to adapt to the long period requirement of operation continuously.
It is not good enough that mechanical seal is used to seal the reliability and the service life of solid-liquid two-phase flow body, especially when containing gas, medium destroys or the sudden change of equipment operation operating mode takes place to lose efficacy easily when vibration and rotor part string move because of the sealing surface liquid film, and changing mechanical seal need disintegrate whole or part equipment, service cycle is long, the expense height.
The spiral seal long service life, it is lower to adapt to pressure, less than 2MPa, though can handle by the pressure release after multiple coil step-down and the sealing for the high-pressure multi-stage pump, dielectric leakage is difficult to avoid.
Packing seal is leaked inevitable, and service life is short, needs to shut down maintenance.
Summary of the invention
In order to solve the ability that the high-pressure multi-stage centrifugal pump adapts to continuous operation of long period and performance variation scope; satisfy high reliability to the pump shaft envelope; long lifetime and almost leak free specific (special) requirements; the purpose of this utility model is to provide a kind of high pressure self balancing segmental centrifugal pump; this pump organically combines the impeller rotor part of symmetric arrangement and the sectional type of housing; adopt the mud shape joint sealant of multistage contactless spiral seal and novel synthetic material to seal formed combination seal; thereby this pump is being kept on the wide basis of sectional type multistage pump performance parameter regulation range; need not adopt Balance disc or balancing drum structure just can realize that huge end thrust reaches autobalance in the pump chamber, and reach by novel combination seal and to carry high pressure solid-liquid gas three-phase flow medium almost not have to leak and realize that the equipment axis envelope do not shut down the effect of maintenance.
The technological scheme that the utility model adopted is:
This pump structure form is the external pipeline self balancing of a sectional type horizontal multi-stage centrifugal pump.Housing is divided into inlet segment, stage casing, water exit end and inner flow passage inlet segment by the form and the progression of sectional type, adopts fastening each section of segmented turnbuckle to form the integral body of pump case.Because water exit end is arranged in the middle part of pump, thereby changing common whole turnbuckle is the segmented turnbuckle, the turnbuckle at water exit end two ends only bears the pulling force that part impeller pressure difference is produced respectively, bolt strainedly improves greatly, can reduce the boundary dimension of the diameter of bolt and pump.
The pump water exit end links to each other by external pipeline with the inner flow passage inlet segment and forms the required runner of impeller symmetric arrangement, simplifies shell construction, is convenient to widening of pump performance scope.
Impeller symmetric arrangement on the pump rotor parts, the axial force that impeller at different levels is produced is cancelled out each other and is reached self balancing.Simultaneously, impeller rings at different levels and sealing axle sleeve are by the interior circulation contactless sealing through the ingenious realization pump chamber of the spiral seal of precise finish liquid, utilize the principle of spiral back suction, pump chamber inner high voltage liquid reaches normal pressure through a series of spiral seal decay such as the sealing of impeller inter-stage, middle sleeve sealing and nockbush sealings.Spiral seal plating hard chromium on surface or special surface cure process are to improve hardness, and suitably increase seal length at the big position of pressure reduction, inter-stage is leaked as far as possible to be reduced, thereby pump is not had substantially leak and almost do not have an easily damaged parts, can reduce the workload of safeguarding and keeping in repair greatly, reduce the operating maintenance cost.
Sliding bearing is adopted in the supporting of pump rotor parts, makes pump operation more steady, and noise is lower.Be provided with the inlet angle contact ball bearing of safety effect at the non-axle external part of pump, when unusual moment sudden change takes place system condition (as cavitation etc.), this bearing is enough to bear additional axial force to guarantee that pump is unlikely to damage.The bearing body part of pump adopts special fan to cool off, and temperature rise is constant in the time of also keeping bearing working under the situation that no-cooling-water maybe can't use the pressure oil lubrication to cool off.
This pump shaft envelope adopts the mud shape joint sealant of multistage contactless spiral seal and novel synthetic material to seal formed combination seal, and this combination seal is made up of four parts: (one): the multistage contactless spiral seal that the sealing of impeller inter-stage, middle sleeve sealing and nockbush sealing etc. are formed; (2) balance chamber that communicates with low-pressure cavity; (3) the mud shape joint sealant of novel synthetic material sealing; (4) socketed cup type stuffing box
The effect of contactless spiral seal part is the abundant step-down of high-pressure medium that utilizes spiral back suction principle that pump chamber is leaked.Simultaneously, when solid particle entered spiral seal face, solid particle entered in the spiral chute with medium and is flushed away, thereby reduced the wearing and tearing of solid particle to sealing surface.
The effect of balance chamber is to collect the medium that the backpitch sealing part is leaked out, and this chamber communicates with the low-pressure cavity of pump, thereby further reduces the inlet pressure of joint sealant sealed letter.
The effect of mud shape joint sealant sealing is by special tool the novel synthetic material high pressure to be injected in the Seal cage, when the pump high speed rotating, composite is with the numerous labyrinth of fibrous formation and be wrapped on the axle sleeve, the depleted fully and almost leak free sealing effect of the pressure that finally reaches medium.Sealing contains solid particle to medium or contains the influence of gaseous state insensitive, and can not lose efficacy when vibration and rotor part play take place in sudden change to the pump operation operating mode.When joint sealant in the pump operation caused dielectric leakage because of leakage loss, that can utilize that special tool realizes joint sealant did not shut down interpolation, stopped or alleviated leakage, prolonged the operation period of equipment.
Because joint sealant belongs to flexible material, its sealed letter two ends are provided with packing and throttling arrangement, to reduce leakage loss.When sealed letter entrance point pressure is higher, the packing of sealed letter end is squeezed and often damages because of frictional heating, and cause the axle sleeve wearing and tearing to accelerate, the utility model is provided with the socketed cup type stuffing box structure, utilize of the extruding of metal a set of cups blocking-up joint sealant, can effectively avoid the generation of packing heat waste phenomenon packing.
The beneficial effects of the utility model are for the high-pressure service pump with high reliability and the continuous service condition of long period, when solid-liquid two-phases such as carrying non-clean re-injection water and turbid circulating water has the former wet goods three-phase flow medium of the medium of certain corrosion and moisture, gas and sand grains, on pump structure, by the impeller rotor part of symmetric arrangement and the sectional type of housing are organically combined, realize the self balancing of axial force and the adaptability of raising pump performance scope.On the other hand; at high pressure, variable working condition and medium characteristics; seal formed combination seal by the mud shape joint sealant that adopts contactless multi-head spiral sealing and novel synthetic material; having solved existing sealing technique is guaranteeing high-pressure service pump high reliability, long lifetime and is not almost having deficiency aspect the leakage; and realize the equipment axis envelope do not shut down maintenance, above-mentioned design has demonstrated fully the advanced idea of high reliability Redundancy Design of the present utility model.
Description of drawings
Fig. 1 is an overall construction drawing of the present utility model;
Fig. 2 is the partial enlarged drawing of general structure of the present utility model, this graph expression the concrete structure of contactless spiral seal;
Fig. 3 is the partial enlarged drawing of general structure of the present utility model, this graph expression the concrete structure of air-cooled bearing part.
Embodiment
Hereinafter with reference to accompanying drawing specific embodiment of the utility model is further described.
Referring to Fig. 1,2,3, a kind of high pressure self balancing of the utility model segmental centrifugal pump, comprise the pump rotor parts, pump case, forward and backward bearing part and turnbuckle, its key is: the sectional type of the impeller rotor part of symmetric arrangement and housing is organically combined, adopt external pipeline form the impeller symmetric arrangement required runner; Housing is divided into inlet segment, stage casing, water exit end and inner flow passage inlet segment by the form and the progression of sectional type, and water exit end is arranged in the middle part of pump, adopts fastening each section of segmented turnbuckle to form the integral body of pump case; Form combination seal by multistage contactless spiral seal and the mud shape joint sealant sealed member that is injected with novel synthetic material.
Described combination seal is meant the multistage contactless spiral seal that the sealing of impeller inter-stage, middle sleeve sealing and nockbush sealing are constituted; The balance chamber 38 that communicates with low-pressure cavity 39; The sealing of mud shape joint sealant and the socketed cup type stuffing box of novel synthetic material
Contactless spiral seal has the sealing axle sleeve second, first 6,25 and the nockbush first 24 that keeps certain seal clearance to be connected by spiral with sealing axle sleeve second, first 6,25 cylindricals that are fastened on the pump shaft 2.
Be provided with multi-head spiral groove on the circle in sealing axle sleeve second, first 6,25 cylindricals and nockbush first 24, its rotation direction is opposite with the pump rotor sense of rotation.When pump operation, pump shaft drives the axle sleeve rotation, and this spiral chute produces back suction suction effect, and is promptly opposite with the dielectric leakage direction, reaches the purpose that makes the high-pressure medium step-down.
High-pressure medium enters balance chamber after contactless multi-head spiral sealing step-down, and balance chamber communicates with the pump low-pressure cavity, makes pressure medium be slightly larger than pump inlet pressure [＜0.6MPa]
In contactless spiral seal and balance chamber back, be provided with the sealed member that has injected novel synthetic material mud shape joint sealant, these parts have sealed letter second 31 and the sealed letter first 35 that is connected, and in sealing axle sleeve first 25 and sealed letter second, first 31,35 cavitys that surrounded restrictor ring 32, packing 33, mud shape joint sealant 34 and packing a set of cups 36 are housed successively from left to right.
Being connected between sealed letter second 31 and the sealed letter first 35 removably connects, and has in sealed letter first 35 outer installment and need not shut down the one-way valve 40 that can add joint sealant 34.
The socketed cup type stuffing box is restrictor ring and packing are housed in packing a set of cups 36 inner peripheral surfaces and the formed cavity of sealing axle sleeve 26 cylindricals successively and compress with packing gland 37.
Joint sealant makes the pressure of medium fully depleted and does not almost have leakages: restrictor ring that the joint sealant front end is promptly held near balance chamber and the packing prevention joint sealant pump chamber that bleeds; The terminal socketed cup type stuffing box structure that is provided with of joint sealant utilizes the extruding of metal a set of cups blocking-up joint sealant to packing, can effectively avoid packing heat waste phenomenon to take place, and leaking outside of preventing to produce.
Sealed letter first, second is made as and removably connects is restrictor ring and the packing of changing when overhauling for the ease of pump in the sealed letter second.
Sealing axle sleeve first 25, preceding impeller 20, middle axle sleeve 17, back impeller 11, sealing axle sleeve second 6 is fastened on the pump shaft 2 by sleeve nut second 3, sleeve nut first 26 and key 22, is the boundary with the water exit end, the import positioned opposite of preceding impeller and back impeller;
Each impeller ring, middle axle sleeve 17, sealing axle sleeve first 25 and sealing axle sleeve second 6 overlap 15 with stage casing seal ring 9, intermediate seal respectively, and nockbush first 24 and nockbush second 7 constitute the multistage contactless spiral seal that the spiral seals of impeller inter-stage, middle axle sleeve spiral seal and nockbush spiral seal are made up;
Multistage inlet segment 23, stage casing 10, preceding stator 19, preceding final stage stator 18 and water exit end 16 usefulness turnbuckle first 21 are fastening; Inner flow passage inlet segment 8, stage casing 10, rear guide vane 13, back final stage stator 1 and water exit end 16 usefulness turnbuckle second 12 are fastening.
The external pipeline of inner flow passage inlet segment 8 and water exit end 16 usefulness 27 UNICOMs form the impeller symmetric arrangement required runner.
By being equipped with fore bearing parts 29, the combination seal parts 4 at rear bearing parts 1, pump two ends and carriage 5 and base 28 are formed high pressure segmental centrifugal pump main frame, and adopt diaphragm coupling 30 and motor direct connection, constitute whole pump group.
During pump operation, MEDIA FLOW is through inlet segment 23, impeller 20 before entering, impeller supercharging through at different levels before by water exit end 16, flows into inner flow passage inlet segments 8 by external pipeline 27 and enters back impeller 11, pass through backs at different levels impeller supercharging again after, medium is finally from water exit end 16 discharges.
In order to the bearing in the forward and backward bearing part 29,1 of supporting pump rotor parts is sliding bearing, sliding bearing is horizontal middle open type structure, constitute by upper bearing (metal) body 44, lower bearing body 46, bearing (ball) cover 43, bearing shell 45, at pump rotor parts left end, be provided with the angular contact ball bearing of safety effect, in bearing (ball) cover 40 outsides fan 42 and fan guard 41 are housed, fan 42 is connected with pump shaft 2, thereby and constant with pump shaft 2 rotation temperature rise when making bearing working to the bearing body part spiral is air-cooled.
Upper and lower bearing support 44,46 cylindricals in the rear bearing parts are cast with radiated rib, to increase heat diffusion area, improve air cooling effect.
Claims (10)
1, a kind of high pressure self balancing segmental centrifugal pump, comprise the pump rotor parts, pump case, forward and backward bearing part and turnbuckle, it is characterized in that: the sectional type of the impeller rotor part of symmetric arrangement and housing is organically combined, adopt external pipeline form the impeller symmetric arrangement required runner; Housing is divided into inlet segment, stage casing, water exit end and inner flow passage inlet segment by the form and the progression of sectional type, and water exit end is arranged in the middle part of pump, adopts fastening each section of segmented turnbuckle to form the integral body of pump case; Form combination seal by multistage contactless spiral seal and the mud shape joint sealant sealed member that is injected with novel synthetic material.
2, high pressure self balancing segmental centrifugal pump according to claim 1 is characterized in that: described combination seal is meant the multistage contactless spiral seal that the sealing of impeller inter-stage, middle sleeve sealing and nockbush sealing are constituted; The balance chamber that communicates with low-pressure cavity; The sealing of mud shape joint sealant and the socketed cup type stuffing box of novel synthetic material.
3, according to claim 1,2 described high pressure self balancing segmental centrifugal pumps, it is characterized in that: contactless spiral seal has the sealing axle sleeve second, first (6,25) and the nockbush first (24) that keeps certain seal clearance to be connected by spiral with sealing axle sleeve second, first (6,25) cylindrical that are fastened on the pump shaft (2).
4, high pressure self balancing segmental centrifugal pump according to claim 3 is characterized in that being provided with multi-head spiral groove on the circle in sealing axle sleeve second, first (6,25) cylindrical and nockbush first (24), and its rotation direction is opposite with the pump rotor sense of rotation.
5, according to claim 1,2 described high pressure self balancing segmental centrifugal pumps, it is characterized in that: in contactless spiral seal and balance chamber back, be provided with the sealed member that has injected novel synthetic material mud shape joint sealant, these parts have sealed letter second (31) and the sealed letter first (35) that is connected, and in the cavity that sealing axle sleeve first (25) and sealed letter second, first (31,35) are surrounded restrictor ring (32), packing (33), mud shape joint sealant (34) and packing a set of cups (36) are housed successively from left to right.
6, high pressure self balancing segmental centrifugal pump according to claim 5; it is characterized in that: being connected between sealed letter second (31) and the sealed letter first (35) removably connects, and has in sealed letter first (35) outer installment and need not shut down the one-way valve (40) that can add joint sealant (34).
7, high pressure self balancing segmental centrifugal pump according to claim 2; It is characterized in that: the socketed cup type stuffing box is restrictor ring and packing are housed in packing a set of cups (36) inner peripheral surface and the formed cavity of sealing axle sleeve (26) cylindrical successively and compress with packing gland (37).
8, high pressure self balancing segmental centrifugal pump according to claim 1, it is characterized in that: sealing axle sleeve first (25), preceding impeller (20), middle axle sleeve (17), back impeller (11), sealing axle sleeve second (6) are fastened on the pump shaft (2) by sleeve nut second (3) and sleeve nut first (26), with the water exit end is the boundary, the import positioned opposite of preceding impeller and back impeller;
Each impeller ring, middle axle sleeve (17), sealing axle sleeve first (25) and sealing axle sleeve second (6) constitute the multistage contactless spiral seal that the spiral seal of impeller inter-stage, middle axle sleeve spiral seal and nockbush spiral seal are made up with stage casing seal ring (9), intermediate seal cover (15), nockbush first (24) and nockbush second (7) respectively;
Multistage inlet segment (23), stage casing (10), preceding stator (19), preceding final stage stator (18) and water exit end (16) are fastening with turnbuckle first (21); Inner flow passage inlet segment (8), stage casing (10), rear guide vane (13), back final stage stator (14) and water exit end (16) are fastening with turnbuckle second (12).
9, high pressure self balancing segmental centrifugal pump according to claim 1, it is characterized in that: in order to the bearing in the forward and backward bearing part (29,1) of supporting pump rotor parts is sliding bearing, also be provided with the angular contact ball bearing of safety effect at its left end, in bearing (ball) cover (40) outside fan (42) and fan guard (41) are housed, fan (42) is connected with axle (2).
10,, it is characterized in that upper and lower bearing support (44, the 46) cylindrical in the rear bearing parts is cast with radiated rib according to claim 1,8 described high pressure self balancing segmental centrifugal pumps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03235051 CN2646424Y (en) | 2003-06-20 | 2003-06-20 | High pressure self balancing segment type centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03235051 CN2646424Y (en) | 2003-06-20 | 2003-06-20 | High pressure self balancing segment type centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2646424Y true CN2646424Y (en) | 2004-10-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03235051 Expired - Lifetime CN2646424Y (en) | 2003-06-20 | 2003-06-20 | High pressure self balancing segment type centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2646424Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080659A (en) * | 2010-12-29 | 2011-06-01 | 荆锁祥 | Sections-distributed-in-pairs twin-volute mine wearable multi-stage pump |
| CN103486074A (en) * | 2013-08-26 | 2014-01-01 | 神华集团有限责任公司 | Seal cartridge assembly for driving end of centrifugal pump and centrifugal pump |
| CN105020143A (en) * | 2015-07-10 | 2015-11-04 | 安徽三环水泵有限责任公司 | Internal recycling self-balancing multi-stage centrifugal water pump |
| CN109322831A (en) * | 2018-11-29 | 2019-02-12 | 长沙佳能通用泵业有限公司 | A kind of double outlet self-balancing multi-stage pumps of four volute chambers |
| CN109340120A (en) * | 2018-11-29 | 2019-02-15 | 长沙佳能通用泵业有限公司 | A kind of four volute chambers three outlet self-balancing multi-stage pump |
| CN109681444A (en) * | 2019-01-07 | 2019-04-26 | 江苏航天水力设备有限公司 | A kind of contact seal high pressure oil head and the full adjusting water pump with it |
-
2003
- 2003-06-20 CN CN 03235051 patent/CN2646424Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080659A (en) * | 2010-12-29 | 2011-06-01 | 荆锁祥 | Sections-distributed-in-pairs twin-volute mine wearable multi-stage pump |
| CN103486074A (en) * | 2013-08-26 | 2014-01-01 | 神华集团有限责任公司 | Seal cartridge assembly for driving end of centrifugal pump and centrifugal pump |
| CN105020143A (en) * | 2015-07-10 | 2015-11-04 | 安徽三环水泵有限责任公司 | Internal recycling self-balancing multi-stage centrifugal water pump |
| CN109322831A (en) * | 2018-11-29 | 2019-02-12 | 长沙佳能通用泵业有限公司 | A kind of double outlet self-balancing multi-stage pumps of four volute chambers |
| CN109340120A (en) * | 2018-11-29 | 2019-02-15 | 长沙佳能通用泵业有限公司 | A kind of four volute chambers three outlet self-balancing multi-stage pump |
| CN109340120B (en) * | 2018-11-29 | 2019-08-13 | 长沙佳能通用泵业有限公司 | A kind of four volute chambers three outlet self-balancing multi-stage pump |
| CN109322831B (en) * | 2018-11-29 | 2019-08-13 | 长沙佳能通用泵业有限公司 | A kind of double outlet self-balancing multi-stage pumps of four volute chambers |
| CN109681444A (en) * | 2019-01-07 | 2019-04-26 | 江苏航天水力设备有限公司 | A kind of contact seal high pressure oil head and the full adjusting water pump with it |
| CN109681444B (en) * | 2019-01-07 | 2023-08-22 | 江苏航天水力设备有限公司 | Contact type sealed high-pressure oil receiver and full-regulation water pump with same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130620 Granted publication date: 20041006 |