CN218347618U - Novel sealing structure of middle-open double-suction pump for ship - Google Patents
Novel sealing structure of middle-open double-suction pump for ship Download PDFInfo
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- CN218347618U CN218347618U CN202122421943.XU CN202122421943U CN218347618U CN 218347618 U CN218347618 U CN 218347618U CN 202122421943 U CN202122421943 U CN 202122421943U CN 218347618 U CN218347618 U CN 218347618U
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Abstract
The utility model relates to a novel seal structure of two suction pumps of middle-open in ship, include: the auxiliary impeller, the spiral pressure relief sleeve, the packing sealing assembly and the pressure relief pipe part; the components are arranged in a sealing cavity of the marine pump, and two auxiliary impellers, a spiral pressure relief sleeve, a packing sealing component and a pressure relief pipe component are arranged in one sealing cavity. The utility model fully utilizes the fluid dynamics principle, blocks liquid by pumping action, and reduces the liquid pressure of blocking by the spiral sealing principle; the packing seal assembly is relied upon to achieve the sealing fluid function at shutdown (i.e., parking). The utility model discloses block that the medium enters into sealed chamber, reduced the probability that takes place to leak, the sealed filler is shut down in the protection, and the seal structure of messenger is more reliable, life is longer.
Description
Technical Field
The utility model relates to a seal structure, concretely relates to novel seal structure of marine horizontal split pump such as sand collection, sand washing that seal structure is more reliable, the operational reliability that life is longer is higher.
Background
The sealing device is an important component of the water pump, determines whether the pump can safely and stably operate or not, and has important significance on environmental pollution. Once the sealing device of water pump became invalid, will all produce serious influence to whole system, can cause the benefit loss even, harm personal safety, environmental pollution scheduling problem. At present, the packing sealing structure of the horizontal split pump is mostly formed by adopting corresponding packing and water seal ring structures for sealing, and can be seen from figure 1. The packing structure is mostly used in systems with medium and low pressure and small leakage. The packing seal assembly structure is composed of a water seal ring 6, packing (packing) 7 and a packing gland 8. The sealing form is single, the abrasion of the filler and the shaft sleeve is fast, the locking is easy, the maintenance period is short, the frequency is multiple, and the leakage amount is unstable.
The marine pump is the core main power device of the sand mining operation of the sand mining ship, and the traditional packing structure hardly satisfies the operating condition requirement of the adverse circumstances, if adopt traditional packing structure, the sand grain wearing and tearing lead to axle sleeve and filler life-span to be low, can influence the safe and stable operation of pump, influence the availability factor of pump, and marine ship platform condition is crude, the space is limited, the shutdown cost is high, can not frequently change axle sleeve and filler, can cause very big benefit loss. Therefore, a new sealing structure of a horizontal split pump for a ship is required to solve the above problems.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a novel seal structure for a marine horizontal split pump, which has a more reliable seal structure, a longer service life and a higher operational reliability.
The utility model discloses a solve above-mentioned technical problem through following technical scheme: the utility model provides a novel seal structure of two suction pumps of middle-open in marine, the novel seal structure of two suction pumps of middle-open in marine includes: the auxiliary impeller, the spiral pressure relief sleeve, the packing sealing assembly and the pressure relief pipe part;
the auxiliary impeller, the spiral pressure relief sleeve, the packing sealing assembly and the pressure relief pipe part are all arranged in a sealing cavity formed between the pump shell and the pump shaft sleeve, and two auxiliary impellers, one spiral pressure relief sleeve, one packing sealing assembly and one pressure relief pipe part are arranged in one sealing cavity.
In a specific embodiment of the present invention, the packing seal assembly includes a driving side seal assembly and a non-driving side seal assembly, and the spiral pressure relief sleeve includes a driving end pressure relief sleeve and a non-driving end pressure relief sleeve;
the driving side pressure relief sleeve and the non-driving side pressure relief sleeve are of symmetrical structures,
the driving side sealing assembly is arranged on the driving side of the horizontal split double-suction pump for the sand boat, and the non-driving side sealing assembly is arranged on the non-driving side of the horizontal split double-suction pump for the sand boat;
the driving side sealing assembly and the non-driving side sealing assembly are arranged between the sealing cavity and the sealing shaft,
the auxiliary impeller comprises two auxiliary impellers at a driving side and two auxiliary impellers at a non-driving side, and the pressure relief pipe sleeve comprises a driving-end pressure relief sleeve and a non-driving-end pressure relief sleeve;
a driving end pressure relief sleeve is arranged between two auxiliary impellers on the driving side, and a non-driving end pressure relief sleeve is arranged between two auxiliary impellers on the non-driving side;
and the driving side and the non-driving side are both provided with pressure relief pipe parts, and the two groups of pressure relief pipe parts are both connected back to the pump inlet.
In the embodiment of the present invention, the driving side seal assembly and the non-driving side seal assembly each include a packing, a gland, and a pressure relief pipe sleeve, the gland fixes the packing in a packing groove between the seal cavity and the seal shaft, and the pressure relief pipe sleeve is installed in the packing.
In the embodiment of the present invention, the upper outer circle of the spiral pressure relief sleeve is in clearance fit with the inner hole of the pump housing, the tongue-and-groove assembly form of the lower outer circle is fixed with the pump housing, the inner hole of the spiral pressure relief sleeve is designed into a trapezoidal thread, and the space between the spiral pressure relief sleeve and the pump shaft sleeve is filled with liquid.
In the embodiment of the present invention, a water seal ring is disposed between the pressure release pipe member and the packing, and the pressure release pipe member is connected to the pump inlet.
In the specific embodiment of the present invention, the water seal ring and the gland are divided into two halves.
In a specific embodiment of the present invention, the sub-impeller is provided with a seal cavity for preventing a medium containing silt from entering the packing.
In an embodiment of the present invention, the drive end pressure relief sleeve and the non-drive end pressure relief sleeve are mounted with a tolerance fit to the housing.
The utility model discloses an actively advance the effect and lie in: the utility model provides a novel seal structure of pump opens in marine level has following advantage: the utility model discloses not only blocked the medium and entered into sealed chamber, the sealed filler of protection shutdown, through practice proof: the combined sealing structure is more reliable, has longer service life, protects the peripheral packing seal from being influenced by media, protects the service life of the packing, reduces the possibility that the packing is locked on the pump shaft, and reduces the pressure bearing burden of the packing. Meanwhile, the pressure relief pipe part is additionally arranged, so that the pressure of the sealing cavity is reduced, and high-pressure water or particles which are not completely removed in the early stage are delivered to the inlet of the pump again, so that the pump can run safely and reliably. The design is highly approved by customers, the performance of a sealing part of the pump is improved, the safety and stability of the pump are improved, the maintenance frequency of the pump is reduced, the management and inventory cost of a factory is reduced, and the problem of sealing of a medium containing particles is solved. The pump for sand mining ship is usually more than 1 meter of bore, and the shaft diameter reaches 250 millimeters, and in order to dismantle the convenience, the water seal ring and the gland among this novel packing seal assembly adopt the water seal ring of halving formula and the gland of halving formula.
Drawings
Fig. 1-1 is a schematic assembly view of the novel seal structure pump head of the horizontal split pump for the ship of the invention.
Fig. 1-2 are partial schematic views of the novel sealing structure of the horizontal split pump for the ship of the invention.
Fig. 2-1 is a perspective view of the structure schematic diagram of the auxiliary impeller of the present invention.
Fig. 2-2 is a front view of the structure schematic diagram of the auxiliary impeller of the present invention.
Fig. 2-3 are E-E sectional views of the structure schematic diagram of the auxiliary impeller of the present invention.
Fig. 3-1 is a front view of the structure of the driving end pressure relief sleeve of the present invention.
Fig. 3-2 is a left side view of the structure schematic diagram of the drive end pressure relief sleeve of the present invention.
Figure 4-1 is a front view of a schematic structural view of a non-drive end pressure relief sleeve of the present invention.
Fig. 4-2 is a left side view of a schematic structural view of a non-drive end pressure relief sleeve of the present invention.
Fig. 5-1 is a perspective view of the structure of the water seal ring of the present invention.
Fig. 5-2 is a front view of the structure schematic diagram of the water seal ring of the present invention.
Fig. 5-3 are the right side view of the structure schematic diagram of the water seal ring of the present invention.
Fig. 6-1 is a front view of the packing gland structure schematic of the present invention.
Fig. 6-2 is a cross-sectional view E-E of the packing gland structure of the present invention.
The utility model discloses the name that well reference numeral corresponds:
the pump comprises an auxiliary impeller 1, a set screw 2, a spiral pressure relief sleeve 3, a pump shaft sleeve 4, a pump shell 5, a water seal ring 6, packing (packing) 7, a packing gland 8, a stud 9, a nut 10 and a pressure relief pipe component 11.
Detailed Description
The following provides a preferred embodiment of the present invention with reference to the accompanying drawings to explain the technical solutions of the present invention in detail.
The pump for the sand production ship has high requirements on working condition parameters and extremely high structural stability, and actually, a middle-open double-suction pump is mostly adopted and a single-stage double-suction impeller is adopted, so that the efficiency is high and the cavitation is excellent; the supporting mode of the two end supports lays a certain foundation for the reliability of the pump. This well open double suction structure pump has two sealed chambeies to pump central line symmetric distribution is sealed and is sealed with non-drive side for the drive side respectively, and wherein spiral pressure release seal cover, according to the direction of pressure release, drive side and non-drive side, spiral pressure release cover revolve to different, also more can be comprehensive explains this novel seal structure's difference to see to the pump from the drive end, pump anticlockwise rotation is the example. Fig. 1-1 is a schematic assembly view of the novel seal structure pump head of the middle-open double-suction pump for the sand dredger of the present invention, and is detailed in fig. 1-1, wherein the position "a" is a non-drive-end shaft seal component, and the position "B" is a drive-end shaft seal component. Fig. 1-2 are schematic partial views of the novel sealing structure of the middle-open double-suction pump for the ship of the present invention. The left side of fig. 1-2 is a detailed enlarged view of the non-drive end shaft seal assembly and the right side is a detailed enlarged view of the drive end shaft seal assembly. As shown in fig. 1-1 and 1-2: the utility model provides a drive side seal assembly structure includes that expeller 1, holding screw 2, drive side spiral discharge cover 3, pump shaft cover 4, pump casing 5, water seal ring 6, packing (packing) 7, gland 8, stud 9, nut 10, pressure release pipe part 11 etc.. The utility model provides a non-drive side seal assembly structure includes that expeller 1, holding screw 2, non-drive side spiral discharge pressure cover 3', pump shaft cover 4, pump casing 5, water seal ring 6, filler (packing) 7, gland 8, stud 9, nut 10, pressure release pipe part 11 etc. and the sealed only spiral discharge pressure cover screw thread of drive side is different soon because drive side and non-drive side pressure release direction are with pump central line symmetry. The above parts are combined and installed together, and the pump for the sand mining ship is protected and navigated.
The utility model fully utilizes the fluid dynamics principle, blocks liquid by pumping action, and reduces the liquid pressure of blocking by the spiral sealing principle; the relief pipe part returns all the unfavorable media to the original media (pump inlet) depending on the function of the sealing liquid when the packing seal assembly achieves the shutdown (namely, the parking).
Fig. 2-1 is a perspective view of the auxiliary impeller structure diagram of the present invention, fig. 2-2 is a front view of the auxiliary impeller structure diagram of the present invention, and fig. 2-3 is an E-E sectional view of the auxiliary impeller structure diagram of the present invention.
The auxiliary impeller is formed by machining a 45# steel plate according to a drawing, 8 radial ribs are machined on one side of the auxiliary impeller to serve as auxiliary blades, and 3 threaded through holes are machined on the other side of the auxiliary impeller to be used for fixing the auxiliary impeller on a pump shaft sleeve through a set screw. When the pump is running, it can rotate synchronously with the rotor of the pump, and the pressure head generated by it can resist the high-pressure medium in the water suction chamber of the pump and make it leak into the sealing cavity, so that the pressure before the shaft seal can be reduced, and the particles can be prevented from entering into the sealing cavity. No leakage, high reliability and long service life. In order to achieve a more ideal state, two auxiliary impellers 1 are arranged on the driving side in a sealing mode, and the non-driving side is symmetrically arranged in front of and behind the spiral pressure relief sleeve on the driving side.
Spiral pressure relief cover, according to the drawing die sinking, turn over the foundry goods, because the medium contains silt, adopt nodular cast iron material more, the thermal treatment back, according to drawing machine-shaping, the latter half adopts the structure of tongue-and-groove, inlays in the pump casing, and the excircle adopts clearance fit and pump casing tang cooperation installation, and the hole leaves 5 mm's radial clearance with the pump shaft cover to processing is trapezoidal thread (Tr), and the screw thread is soon to available left and right hand rule and is judged: the four fingers point to the rotation direction of the pump shaft, the thumb points to the low-pressure side, the right hand meets the requirement that the thread takes the right rotation, and the left hand meets the requirement that the thread takes the left rotation). A drive side pressure relief sleeve 3 (figures 4-1 and 4-2), and a non-drive side pressure relief sleeve 3' (figures 3-1 and 3-2). Between the spiral pressure relief sleeve and the pump shaft sleeve, when the pump runs, pumping action is generated to prevent leakage, the spiral pressure relief sleeve extends from the high-pressure end to the low-pressure end, the pressure is gradually reduced, and the spiral pressure relief sleeve is suitable for sealing under severe conditions and has long service life.
The utility model discloses a fluid dynamics principle, rotation type seal structure's auxiliary impeller overcomes traditional sealed not enough that packs, is applicable to the dielectric pump that contains silt and seals. The auxiliary impeller props against the high-pressure medium containing silt conveyed by the pump by a pressure head generated by the auxiliary impeller and leaks into the packing seal cavity (namely leaks outwards).
The utility model discloses in adopt the spiral to let out and press the cover, its excircle and pump casing hole clearance fit, the assembly form of half excircle design tongue-and-groove formula is fixed with the pump casing, and the trapezoidal thread is designed into to spiral let out cover hole, and the screw thread selects to decision pump sending direction, and available left and right hand rule judges. The gap between the spiral pressure relief sleeve and the pump shaft sleeve is filled with liquid, when the pump rotor component operates, a pumping effect is generated, leakage is prevented, the medium pressure in a high-pressure area is gradually reduced, the spiral pressure relief sleeve is changed without friction, the service life is long for several years, and the maintenance is convenient.
In the concrete implementation example of the utility model, divide half formula water seal ring for the packing of large-scale marine horizontal split pump is washed lubricated, divides half design convenience dismouting. The split type packing gland is used as a packing sealing assembly of a large-scale marine horizontal split pump and used for compressing packing in a sealing cavity, and the split type design is convenient to disassemble and assemble and replace the packing in the later period.
In the specific embodiment of the present invention, the pressure relief pipe member returns the unfavorable medium to the pump inlet, thereby protecting the service life of the packing and the pump shaft sleeve.
The auxiliary impeller and the spiral pressure relief sleeve both play a role in the operation of the pump, so a parking sealing device (a packing sealing assembly) needs to be arranged, and the packing sealing assembly consists of a water seal ring 6, packing (packing) 7, a packing gland 8, a stud 9 and a nut 10. The excircle of the pump shaft sleeve is 250mm, and the water seal ring and the packing gland are divided into halves, namely a divided-half water seal ring (figure 5-2) and a divided-half packing gland (figure 6-1), so that the pump shaft sleeve is convenient to disassemble and maintain after sale. And the double-end stud and the nut are used for compressing the filler in the sealing cavity.
The driving side and the non-driving side are both provided with pressure relief pipe parts 11, and the two groups of pressure relief pipe parts 11 are gathered and are connected back to the inlet of the pump, so that all adverse factors are eliminated completely.
The utility model discloses parking is sealed to adopt original packing structure, comprises gland, water seal ring, packing and corresponding fastener to corresponding optimization has been done, with water seal ring and gland design component half formula, unanimous with the dismouting mode of pump case body, makes things convenient for the dismouting, is particularly useful for large-scale well turn on pump. A hydrodynamic sealing structure is added on the basis, namely a first back impeller 1 (figures 2-1, 2-2 and 2-3) is arranged at the initial position of a sealing cavity of a pump shell, an auxiliary impeller is fixed on a shaft sleeve (the shaft sleeve 11 is fixed on a pump shaft through a common flat key) through a set screw 14 and rotates together as a rotating part during working, medium pressure is reduced to enable silt media not to flow into the sealing cavity as much as possible, then pressure is relieved through a pressure relief sleeve, and the pressure relief sleeve is processed with threads to form thread sealing (the thread rotation direction can be judged by a left-hand rule and a right-hand rule, namely four fingers point to the rotation direction of the pump shaft, a thumb points to the low-pressure side, a right hand meets the right hand and a left hand meets the left hand). The driving side pressure relief sleeve 3 and the non-driving side pressure relief sleeve 3' have opposite thread directions, and the pump rotates clockwise when viewed from the driving end. The driving and non-driving are exchanged according to the pump rotation direction, so that the pressure relief effect is achieved, and the volume loss is reduced. And meanwhile, double insurance is performed, an auxiliary impeller 1 is additionally arranged, and the installation and working principle of the auxiliary impeller is the same as that of the first auxiliary impeller. Finally, a water seal ring 6 is additionally arranged, a pressure relief pipe part 11 is installed, and few unfavorable media are smoothly connected back to the inlet of the pump. The design of the fluid dynamic packing sealing structure not only blocks the medium from entering the sealing cavity and protects the packing sealed during shutdown, but also proves that: the combined sealing structure is more reliable, has longer service life, protects the peripheral packing seal from being influenced by media, protects the service life of the packing, and reduces the possibility that the packing is locked on the pump shaft. Meanwhile, the pressure relief pipe part is additionally arranged, so that the pressure of the sealing cavity is reduced, and high-pressure water or particles which are not completely removed in the early stage are delivered to the inlet of the pump again, so that the pump can run safely and reliably. The design is highly approved by customers, the performance of sealing parts of the pump is improved, the safety and stability of the pump are improved, the maintenance frequency of the pump is reduced, the service life of the seal is prolonged, the management inventory cost of a factory is reduced, and the problem of sealing of a medium containing particles is solved.
The utility model provides a compound technical scheme, including packing seal with fluid power seal structure, pump shaft and pump chamber joint position adopt fluid power to seal, and the drive end includes that first auxiliary impeller, drive end let off the cover, the second says the auxiliary impeller, and the non-drive end includes that first auxiliary impeller, non-drive end let off the cover, the second says the auxiliary impeller. As shown in fig. 1-2, each auxiliary impeller is fixed on the rotating member by a lock nut, and when the pump works, the auxiliary impellers are driven to rotate together, so that silt can not enter the sealing cavity. The operation ensures that the pump has no leakage, no mechanical abrasion, high reliability and long service life when in operation.
And the driving end pressure relief sleeve and the non-driving end pressure relief sleeve are installed in a tolerance fit mode with the shell. The inner hole is processed into a trapezoidal thread (Tr), which not only has the function of pressure relief, but also indirectly has the function of spiral sealing. The pressure relief sleeve is particularly suitable for high-pressure occasions, is simple to manufacture and low in cost, has no fixed friction due to non-contact between the pressure relief sleeve and the shaft sleeve, has the service life as long as decades and is convenient to maintain.
Meanwhile, the original parking filler is placed outside the sealing cavity for sealing, so that the power sealing is prevented from losing efficacy when the pump is stopped.
In specific embodiment, the utility model discloses external sparge water washes through the water seal ring, for the packing washes lubricated cooling, establishes a water seal ring again, with the medium that wash water and power seal position leaked, through return water pipe part, flows back to the pump water inlet at last.
The series of operations greatly reduce the service life of the shaft seal of the marine pump and simultaneously increase the safety and stability of the pump. The structure is particularly suitable for the occasions containing silt.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (8)
1. The utility model provides a novel seal structure of middle-open double entry pump for ship which characterized in that: the novel seal structure of middle open double entry pump for ship includes: the auxiliary impeller, the spiral pressure relief sleeve, the packing sealing assembly and the pressure relief pipe part;
the auxiliary impeller, the spiral pressure relief sleeve, the packing sealing assembly and the pressure relief pipe part are all arranged in a sealing cavity formed between the pump shell and the pump shaft sleeve, and two auxiliary impellers, one spiral pressure relief sleeve, one packing sealing assembly and one pressure relief pipe part are arranged in one sealing cavity.
2. The novel sealing structure of the middle-open double-suction pump for the ship as claimed in claim 1, wherein: the packing sealing assembly comprises a driving side sealing assembly and a non-driving side sealing assembly, and the spiral pressure relief sleeve comprises a driving end pressure relief sleeve and a non-driving end pressure relief sleeve;
the driving side pressure relief sleeve and the non-driving side pressure relief sleeve are of symmetrical structures,
the driving side sealing assembly is arranged on the driving side of the horizontal split double-suction pump for the sand boat, and the non-driving side sealing assembly is arranged on the non-driving side of the horizontal split double-suction pump for the sand boat;
the driving side sealing assembly and the non-driving side sealing assembly are arranged between the sealing cavity and the sealing shaft,
the auxiliary impeller comprises two auxiliary impellers at a driving side and two auxiliary impellers at a non-driving side, and the pressure relief pipe sleeve comprises a driving-end pressure relief sleeve and a non-driving-end pressure relief sleeve;
a driving end pressure relief sleeve is arranged between two auxiliary impellers on the driving side, and a non-driving end pressure relief sleeve is arranged between two auxiliary impellers on the non-driving side;
pressure relief pipe parts are installed on the driving side and the non-driving side, and the two groups of pressure relief pipe parts are connected back to the pump inlet.
3. The novel sealing structure of the marine split double suction pump according to claim 2, characterized in that: the driving side sealing assembly and the non-driving side sealing assembly respectively comprise a packing, a gland and a pressure relief pipe sleeve, the gland fixes the packing in a packing groove between the sealing cavity and the sealing shaft, and the pressure relief pipe sleeve is installed in the packing.
4. The novel sealing structure of the marine split double suction pump according to claim 2, characterized in that: the upper excircle of the spiral pressure relief sleeve is in clearance fit with the inner hole of the pump shell, the lower excircle of the spiral pressure relief sleeve is fixed with the pump shell in a tongue-and-groove assembly mode, the inner hole of the spiral pressure relief sleeve is designed into a trapezoidal thread, and liquid is filled in a gap between the spiral pressure relief sleeve and the pump shaft sleeve.
5. The novel sealing structure of the middle-open double-suction pump for the ship as claimed in claim 3, wherein: a water seal ring is arranged between the pressure relief pipe component and the filler, and the pressure relief pipe component is connected to the inlet of the pump.
6. The novel sealing structure of the marine middle-open double-suction pump as claimed in claim 5, wherein: the water seal ring and the gland are divided into halves.
7. The novel seal structure of the axially split double suction pump for the ship as claimed in claim 2, characterized in that: the auxiliary impeller is provided with a sealing cavity which prevents media containing silt from entering the filler.
8. The novel seal structure of the axially split double suction pump for the ship as claimed in claim 2, characterized in that: and the driving end pressure relief sleeve and the non-driving end pressure relief sleeve are installed in a tolerance fit mode with the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122421943.XU CN218347618U (en) | 2021-10-09 | 2021-10-09 | Novel sealing structure of middle-open double-suction pump for ship |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122421943.XU CN218347618U (en) | 2021-10-09 | 2021-10-09 | Novel sealing structure of middle-open double-suction pump for ship |
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| CN218347618U true CN218347618U (en) | 2023-01-20 |
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| CN202122421943.XU Active CN218347618U (en) | 2021-10-09 | 2021-10-09 | Novel sealing structure of middle-open double-suction pump for ship |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113775562A (en) * | 2021-10-09 | 2021-12-10 | 上海凯泉泵业（集团）有限公司 | Novel sealing structure of middle-open double-suction pump for ship |
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2021
- 2021-10-09 CN CN202122421943.XU patent/CN218347618U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113775562A (en) * | 2021-10-09 | 2021-12-10 | 上海凯泉泵业（集团）有限公司 | Novel sealing structure of middle-open double-suction pump for ship |
| CN113775562B (en) * | 2021-10-09 | 2024-05-14 | 上海凯泉泵业（集团）有限公司 | Novel sealing structure of marine split double suction pump |
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