阅读说明：本技术 一种船用中开双吸泵新型密封结构 (Novel sealing structure of middle-open double-suction pump for ship ) 是由 张克凤 何敏 罗鸿斌 王德彬 毛佛云 于 2021-10-09 设计创作，主要内容包括：本发明涉及一种船用中开双吸泵新型密封结构,包括：副叶轮、螺旋泄压套、填料密封组件、泄压管部件；以上组件设置在船用泵的密封腔体内,一个密封腔体内设有两道副叶轮,一个螺旋泄压套、一个填料密封组件、一个泄压管部件。本发明充分的利用流体动力学原理,依靠泵送作用封堵液体,依靠螺旋密封原理,降低封堵的液体压力；依赖填料密封组件达到停机(即停车)时密封液体的作用。本发明阻断了介质进入到密封腔,降低发生泄漏的概率,保护停机密封的填料,使的密封结构更可靠、使用寿命更长。(The invention relates to a novel sealing structure of a middle-opening double-suction pump for a ship, which comprises: 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 invention fully utilizes the fluid dynamics principle, blocks liquid by means of pumping action, and reduces the liquid pressure of the block by means of the spiral sealing principle; the packing seal assembly is relied upon to achieve the sealing fluid function at shutdown (i.e., shut down). The invention prevents the medium from entering the sealing cavity, reduces the leakage probability, protects the packing of the shutdown sealing, and ensures that the sealing structure is more reliable and has longer service life.)

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 middle-open double-suction pump for the ship as claimed in claim 5, wherein: the water seal ring and the gland are divided into halves.

7. The novel sealing structure of the marine split double suction pump according to 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 sealing structure of the marine split double suction pump according to claim 2, characterized in that: and the driving end pressure relief sleeve and the non-driving end pressure relief sleeve are installed with the shell in a tolerance fit mode.

Technical Field

The invention relates to a sealing structure, in particular to a novel sealing structure of a marine horizontal split pump for sand mining, sand flushing and the like, which has more reliable sealing structure, longer service life and higher operation reliability.

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 consists 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 marine horizontal split pump is needed to solve the above problems.

Disclosure of Invention

In view of the above problems, the main 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 higher operational reliability.

The invention solves the technical problems through the 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 example of the invention, the packing seal assembly comprises a driving side seal assembly and a non-driving side seal 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.

In an embodiment of the invention, the driving side sealing assembly and the non-driving side sealing assembly 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.

In the specific implementation example of the invention, the upper excircle of the spiral pressure relief sleeve is in clearance fit with the inner hole of the pump shell, the lower semicircle is in a tongue-and-groove type assembly form and is fixed with the pump shell, the inner hole of the spiral pressure relief sleeve is designed into a trapezoidal thread, and a gap between the spiral pressure relief sleeve and the pump shaft sleeve is filled with liquid.

In the embodiment example of the invention, 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.

In the concrete implementation example of the invention, the water seal ring and the gland are in a half-split type.

In a specific embodiment of the invention, the secondary impeller is provided with a sealed cavity which prevents media containing silt from entering the packing.

In a specific embodiment of the invention, the drive-end and non-drive-end pressure relief sleeves are tolerance-fitted to the housing.

The positive progress effects of the invention are as follows: the novel sealing structure of the horizontal split pump for the ship provided by the invention has the following advantages: the invention 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, 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 a pump head of the novel sealing structure of the horizontal split pump for the ship.

Fig. 1-2 are schematic partial views of the novel seal structure of the marine horizontal split pump of the invention.

Fig. 2-1 is a perspective view of a schematic construction of the auxiliary impeller of the present invention.

Fig. 2-2 is a front view of a structural schematic of the secondary impeller of the present invention.

Fig. 2-3 are E-E cross-sectional views of the construction of the expeller of the present invention.

Figure 3-1 is a front view of a schematic of the structure of the drive end pressure relief boot of the present invention.

Figure 3-2 is a left side view of a schematic of the structure of the drive end pressure relief boot of the present invention.

Figure 4-1 is a front view of a schematic of the non-drive end pressure relief sleeve of the present invention.

Figure 4-2 is a left side view of a schematic of the structure of the non-drive end pressure relief boot of the present invention.

Fig. 5-1 is a perspective view of a water seal ring structure of the present invention.

Fig. 5-2 is a front view of a schematic view of the water seal ring structure of the present invention.

Fig. 5-3 are right side views of the water seal ring configuration of the present invention.

Figure 6-1 is a front view of a schematic of the gland construction of the present invention.

Figure 6-2 is a cross-sectional view E-E of the gland structure schematic of the present invention.

The following are the names corresponding to the reference numbers in the invention:

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 bolt 9, a nut 10 and a pressure relief pipe part 11.

Detailed Description

The following provides a preferred embodiment of the present invention with reference to the accompanying drawings, so as 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 support 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 a pump head of a novel sealing structure of a middle-opening double-suction pump for a sand production ship, and is detailed in fig. 1-1, wherein a non-driving-end shaft seal assembly is arranged at a position A, and a driving-end shaft seal assembly is arranged at a position B. Fig. 1-2 are partial schematic views of the novel sealing structure of the middle-open double-suction pump for the ship. 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 invention provides a driving side sealing assembly structure which comprises an auxiliary impeller 1, a set screw 2, a driving side 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, a pressure relief pipe part 11 and the like. The invention provides a non-driving side sealing assembly structure which comprises an auxiliary impeller 1, a set screw 2, a non-driving side 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, a pressure relief pipe part 11 and the like, wherein the driving side sealing and the non-driving side sealing only have different spiral pressure relief sleeve screw thread screwing directions because the driving side and the non-driving side pressure relief directions are symmetrical with a pump central line. The above parts are combined and installed together to protect the driving of the pump for the sand mining ship.

The invention fully utilizes the fluid dynamics principle, blocks liquid by means of pumping action, and reduces the liquid pressure of the block by means of the spiral sealing principle; the relief pipe unit returns all the undesired media to the original media (pump inlet) depending on the effect of the sealing liquid at shutdown (i.e., shut down) of the stuffing seal assembly.

Fig. 2-1 is a perspective view of a structural view of an auxiliary impeller of the present invention, fig. 2-2 is a front view of the structural view of the auxiliary impeller of the present invention, and fig. 2-3 is a sectional view E-E of the structural view of the auxiliary impeller 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 part 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 is reduced and the particles are 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). Drive side dump sleeve 3 (figures 4-1 and 4-2), non-drive side dump sleeve 3' (figures 3-1 and 3-2). Between the spiral pressure relief sleeve and the pump shaft sleeve, when the pump runs, a pumping effect 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 invention adopts the fluid dynamics principle, and the auxiliary impeller with the rotary sealing structure overcomes the defects of the traditional packing seal, and is suitable for sealing a medium pump containing silt. 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 invention adopts a spiral pressure relief sleeve, the excircle of the spiral pressure relief sleeve is in clearance fit with the inner hole of the pump shell, the lower semi-excircle 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 the direction of the thread is selected to determine the pumping direction, and the pump can be judged by a left-hand rule and a right-hand rule. 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 pump is convenient to maintain.

In the specific implementation example of the invention, the half-split water seal ring is used for washing and lubricating the filler of a large-scale marine horizontal split pump, and the half-split design is convenient to assemble and disassemble. The split packing gland is used as a packing sealing component of a large-scale marine horizontal split pump and used for compressing packing in a sealing cavity, and the split design is convenient to disassemble and assemble and replace the packing at the later stage.

In the embodiment of the invention, the pressure relief pipe component returns unfavorable media to the inlet of the pump, and the service life of the filler and the pump shaft sleeve is protected.

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.

Pressure release pipe parts 11 are installed on the driving side and the non-driving side, and two groups of pressure release pipe parts 11 are gathered and are connected back to the pump inlet, so that all adverse factors are eliminated completely.

The parking seal adopts the original packing seal structure, consists of a packing gland, a water seal ring, a packing and corresponding fasteners, is optimized correspondingly, is consistent with the disassembly and assembly mode of a pump shell by designing the water seal ring and the packing gland into a half type, is convenient to disassemble and assemble, and is particularly suitable for large-scale split pumps. 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 (a 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 medium 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 provided with threads for better sealing effect 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 the left hand meets the left hand requirement of the threads). The driving side pressure relief sleeve 3 and the non-driving side pressure relief sleeve 3' are opposite in thread direction, 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 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 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 invention provides a composite technical scheme, which comprises a packing seal and hydrodynamic seal structure, wherein the hydrodynamic seal is adopted at the joint part of a pump shaft and a pump cavity, the drive end comprises a first auxiliary impeller, a drive end pressure relief sleeve and a second auxiliary impeller, and the non-drive end comprises the first auxiliary impeller, the non-drive end pressure relief sleeve and the second auxiliary impeller. As shown in fig. 1-2, each sub-impeller is fixed on the rotating member by a lock nut, and when the pump works, the sub-impellers are driven to rotate together, so that silt can not enter the sealed cavity. The operation ensures that the pump has no leakage, no mechanical abrasion, high reliability and long service life when in operation.

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 a specific embodiment, the external washing water is externally connected, the packing is washed through a water seal ring to wash, lubricate and cool the packing, the water seal ring is arranged, and the washing water and a medium leaked from a dynamic seal part flow back to a water inlet of the pump through a water return pipe component.

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 occasions containing silt.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but 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.