阅读说明：本技术 一种立式结构的多级双吸泵 (Multistage double suction pump with vertical structure ) 是由 刘亮亮 芦洪钟 王斌 诸葛磊 唐钧 于 2020-12-31 设计创作，主要内容包括：本发明涉及一种立式结构的多级双吸泵,为立式多级可抽芯双筒体节段式离心泵,泵进水段和泵出水段位于泵体的侧面,泵体为圆筒式结构,泵体上设有泵盖,泵盖上开设有轴孔；泵体内部采用整体抽芯结构,整个抽芯结构包括吸入段、导叶、叶轮、中段和转子部件,整个抽芯结构能从顶部完全抽出；叶轮包括首级叶轮、中段叶轮和末级叶轮；首级叶轮采用双吸叶轮,中段叶轮配径向导叶,末级叶轮后配平衡鼓结构。本发明结构紧凑,转子部件刚度高,检修方便；首级叶轮采用双吸叶轮,汽蚀性能良好；整个装置运行平衡,可靠性高,且抗倾斜、摇摆及抗震性能良好。(The invention relates to a multistage double-suction pump with a vertical structure, which is a vertical multistage core-pulling double-cylinder sectional centrifugal pump, wherein a pump water inlet section and a pump water outlet section are positioned on the side surface of a pump body, the pump body is in a cylindrical structure, a pump cover is arranged on the pump body, and a shaft hole is formed in the pump cover; the pump body is internally provided with an integral core-pulling structure, the integral core-pulling structure comprises a suction section, a guide vane, an impeller, a middle section and a rotor part, and the integral core-pulling structure can be completely extracted from the top; the impeller comprises a first-stage impeller, a middle-stage impeller and a last-stage impeller; the first-stage impeller adopts a double-suction impeller, the middle-stage impeller is provided with a radial guide vane, and the rear part of the last-stage impeller is provided with a balance drum structure. The invention has compact structure, high rigidity of the rotor part and convenient maintenance; the first-stage impeller adopts a double-suction impeller, so that the cavitation performance is good; the whole device has balanced operation, high reliability and good anti-tilt, anti-swing and anti-seismic performance.)

1. The utility model provides a multistage double entry pump of vertical structure which characterized in that: the multistage double-suction pump with the vertical structure is a vertical multistage core-pulling double-cylinder sectional centrifugal pump, a water inlet section and a water outlet section of the pump are positioned on the side surface of a pump body,

the pump body is of a cylindrical structure, a pump cover is arranged on the pump body, and a shaft hole is formed in the pump cover;

the whole core-pulling structure comprises a suction section, a guide vane, an impeller, a middle section and a rotor part, and can be completely extracted from the top;

the impeller comprises a first-stage impeller, a middle-stage impeller and a last-stage impeller;

the first-stage impeller adopts a double-suction impeller, the middle-stage impeller is provided with radial guide vanes, and the rear part of the last-stage impeller is provided with a balance drum structure.

2. The multistage double suction pump of vertical structure according to claim 1, characterized in that: and a cooling water pipeline is arranged in the pump body, one part of water directly cools the machine seal jacket cavity and the bearing water cooling cavity, and the other part of water cools the machine seal heat exchanger and the motor heat exchanger.

3. The multistage double suction pump of vertical structure according to claim 1, characterized in that: and a diaphragm type coupling is adopted between the motor and the pump body.

4. The multistage double suction pump of vertical structure according to claim 1, characterized in that: the driving end of the multistage double-suction pump with the vertical structure is provided with a thrust angular contact ball bearing for axially fixing and balancing residual axial force; the non-driving end is provided with a radial water guide bearing for balancing residual radial force.

5. The multistage double suction pump of vertical structure according to claim 1, characterized in that: the bearing box of the multistage double-suction pump with the vertical structure is internally provided with a water cooling cavity, cold water is adopted for cooling, and a bearing gland is of a labyrinth structure.

6. The multistage double suction pump of vertical structure according to claim 1, characterized in that: the mechanical seal is a single-end-face, balanced and integrated mechanical seal, and is arranged between the pump cover and the bearing component.

7. The multistage double suction pump of vertical structure according to claim 1, characterized in that: the pump water inlet section and the pump water outlet section are welded on the same side or two sides of the pump body.

Technical Field

The invention relates to a multistage double-suction pump, in particular to a vertical multistage double-suction pump which is convenient to install and maintain, compact in structure and high in reliability.

Background

With the gradual deepening of marine economic development and the continuous prominent requirement of national sea rights maintenance strategy in China, the requirement on a marine distributed energy base is already shown. The offshore small-scale reactor nuclear power station becomes the first choice for meeting the offshore energy demand due to the characteristics of high power density, low fuel supply demand, safety, economy, multiple purposes, cleanness, no pollution and the like. However, due to the characteristics of limited space, shaking, inclination and the like of the offshore floating platform, the requirements of safety, simplicity, convenience, easy maintenance, high reliability, strong adaptability, compact structure size and the like are provided for pump equipment used on the offshore floating platform.

Disclosure of Invention

In view of the above problems, the present invention provides a vertical multi-stage double-suction pump with convenient installation and maintenance, compact structure and high reliability.

The invention solves the technical problems through the following technical scheme: the multistage double-suction pump with the vertical structure is a vertical multistage core-pulling double-cylinder sectional centrifugal pump, and a water inlet section and a water outlet section of the pump are positioned on the side face of a pump body.

The pump body is a cylindrical structure, a pump cover is arranged on the pump body, and a shaft hole is formed in the pump cover.

The pump body is internally provided with an integral core-pulling structure, the integral core-pulling structure comprises an suction section, a guide vane, an impeller, a middle section and a rotor part, and the integral core-pulling structure can be completely extracted from the top.

The impeller comprises a first-stage impeller, a middle-stage impeller and a last-stage impeller.

The first-stage impeller adopts a double-suction impeller, the middle-stage impeller is provided with radial guide vanes, and the rear part of the last-stage impeller is provided with a balance drum structure.

In a specific implementation example of the invention, a cooling water pipeline is arranged in the pump body, one part of water is directly cooled by the machine seal jacket cavity and the bearing water cooling cavity, and the other part of water is cooled by the machine seal heat exchanger and the motor heat exchanger.

In the embodiment of the invention, a diaphragm type coupling is adopted between the motor and the pump body.

In a specific implementation example of the invention, a thrust angular contact ball bearing is arranged at the driving end of the multistage double-suction pump with a vertical structure, so as to axially fix and balance residual axial force; the non-driving end is provided with a radial water guide bearing for balancing residual radial force.

In the concrete implementation example of the invention, a water cooling cavity is arranged in the bearing box of the multistage double-suction pump with the vertical structure, cold water is adopted for cooling, and the bearing gland is in a labyrinth structure.

In an embodiment of the present invention, the mechanical seal is a single-ended, balanced, integrated mechanical seal, which is disposed between the pump cover and the bearing member.

In the embodiment example of the invention, the water inlet section and the water outlet section of the pump are welded on the same side or two sides of the pump body.

The positive progress effects of the invention are as follows: the multistage double-suction pump with the vertical structure provided by the invention has the following advantages: the invention is a vertical type core-pulling double-barrel centrifugal pump, which has compact structure, high rigidity of rotor parts and convenient maintenance; the first-stage impeller adopts a double-suction impeller, so that the cavitation performance is good; the whole device has balanced operation, high reliability and good anti-tilt, anti-swing and anti-seismic performance.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

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

the pump comprises a driving end bearing component 1, a pump cover 2, a mechanical seal 3, a pump body 4, a balance drum 5, a last stage guide vane 6, a pump shaft 7, a tail end middle section 8, a spitting section 9, a spitting section guide vane 10, a water pumping-out section 11, a secondary stage guide vane 12, a pump water inlet section 13, a middle section 14, a suction cover 15, a first stage impeller 16, a first stage guide vane 17, a suction section 18, a water guide bearing 19 and an end cover 20.

Detailed Description

The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.

Fig. 1 is a schematic view of the overall structure of the present invention. As shown in fig. 1: the invention provides a vertical-structure multistage double-suction pump which is a vertical-structure multistage core-pulling double-cylinder sectional centrifugal pump, wherein a pump water inlet section and a pump water outlet section are positioned on the side surface of a pump body.

The pump body is a cylindrical structure, a pump cover is arranged on the pump body, and a shaft hole is formed in the pump cover.

The pump body is inside to adopt whole structure of loosing core, and whole structure of loosing core is including inhaling section, stator, impeller, middle section and rotor part, and whole structure of loosing core can be taken out from the top completely.

The impeller comprises a first-stage impeller, a middle-stage impeller and a last-stage impeller.

The first-stage impeller adopts a double-suction impeller, the middle-stage impeller is provided with a radial guide vane, and the rear part of the last-stage impeller is provided with a balance drum structure.

A cooling water pipeline is arranged in the pump body, one part of water directly cools the machine seal jacket cavity and the bearing water cooling cavity, and the other part of water cools the machine seal heat exchanger and the motor heat exchanger.

Adopt diaphragm formula shaft coupling between motor and the pump body, can set up to different length types according to the demand of use place and dismouting maintenance, have two kinds of basis, single basis, establish water cooling system in this motor to can bear the slope and the swing of certain degree.

The driving end is provided with a thrust angular contact ball bearing for axially fixing and balancing residual axial force; the non-driving end is provided with a radial water guide bearing for balancing residual radial force.

The bearing box is internally provided with a water cooling cavity, cold water is adopted for cooling, and the bearing gland is of a labyrinth structure.

The mechanical seal is a single-end-face, balanced and integrated mechanical seal, and is arranged between the pump cover and the bearing component.

The pump water inlet section 13 and the pump water outlet section 11 are welded on the same side or two sides of the pump body 4.

The following is a specific example of implementation:

the invention provides a multistage double-suction pump with a vertical structure, which comprises a centrifugal pump and a motor arranged above the centrifugal pump, wherein the centrifugal pump comprises: the pump comprises a driving end bearing component 1, a pump cover 2, a mechanical seal 3, a pump body 4, a balance drum 5, a last stage guide vane 6, a pump shaft 7, a tail end middle section 8, a spitting section 9, a spitting section guide vane 10, a water pumping-out section 11, a secondary stage guide vane 12, a pump water inlet section 13, a middle section 14, a suction cover 15, a first stage impeller 16, a first stage guide vane 17, a suction section 18, a water guide bearing 19 and an end cover 20.

The centrifugal pump is a core-pulling double-barrel sectional type centrifugal pump, the structure is simple and compact, the pump body 4 is of a cylindrical structure, the pump water inlet section 13 and the pump water outlet section 11 are welded on the side face (can be on the same side or on two sides) of the pump body 4, the pump cover 2 is arranged above the pump body 4, the center of the pump cover 2 is provided with a shaft hole through which the pump shaft 7 penetrates, and the cooling mechanism is arranged inside the pump cover 2. The shaft seal of the pump is a quick-mounting mechanical seal 3, the pump is safe and reliable, the pump rotor is a rigid rotor, and a replaceable shaft sleeve is arranged at the position of the pump shaft 7 which is easy to wear.

The pump adopts an integral core-pulling structure. Under the condition that the inlet and outlet pipelines are not moved, after the pump coupler and the drive end mechanical seal and the bearing part are disassembled, the whole core package component can be integrally pumped out, the pump pumping components of the same type can be exchanged, and the overhaul and the maintenance are convenient. For the inner core body, an impeller is matched with a radial guide vane (the radial force of the pump is basically balanced), the first-stage impeller 16 adopts a double-suction impeller, the cavitation erosion resistance of the pump is improved, and a balance drum 5 is additionally arranged behind the last-stage impeller to balance the redundant axial force, so that the operation is more reliable.

The support of rotor adopts the classic support mode of vertical pump, and the drive end is provided with thrust angular contact ball bearing, balanced residual axial force, adopts grease lubrication cooling, and the bearing box is equipped with water-cooling chamber, safe and reliable. Compared with domestic similar pumps, the pump has reliable forms of bearing selection, arrangement and installation, lubrication and cooling. The non-driving end is provided with a water guide bearing, water is guided from the first-stage impeller to wash and lubricate the first-stage impeller, and residual radial force is balanced.

The pump is connected with a motor above through a diaphragm type coupler, the coupler can be set to be different in length according to the use place and the requirements of disassembly, assembly and maintenance, the coupler is provided with two types of double foundations and a single foundation, and a shield is arranged outside the coupler.

When the pump works, the motor drives the pump shaft 7 to rotate at a high speed, the pump shaft 7 drives each stage of impeller to rotate and apply work to water flow, and the water flow enters from the pump inlet 13 at the lower side of the pump body 4 and flows out from the pump outlet 11 at the upper side after being pressurized by each stage of impeller. The pump water flows through the heat exchanger and flushes the mechanical seal 3.

The invention meets the performance requirement of the pump, simultaneously, the structure of the pump is designed to be more compact in the axial direction and the radial direction, the requirement of the limited space of the offshore pile platform can be completely met, and simultaneously, the whole unit has stable operation, low noise and good anti-inclination, anti-swing and anti-seismic performance.

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.