CN219176630U

CN219176630U - Double-cylinder segment type boiler feed pump

Info

Publication number: CN219176630U
Application number: CN202320008167.7U
Authority: CN
Inventors: 郝迎旭
Original assignee: Shenyang Industrial Pump Manufacturing Co ltd
Current assignee: Shenyang Industrial Pump Manufacturing Co ltd
Priority date: 2023-01-04
Filing date: 2023-01-04
Publication date: 2023-06-13
Anticipated expiration: 2033-01-04

Abstract

A double-cylinder segment type boiler feed pump belongs to the technical field of hydraulic mechanical equipment. The utility model comprises a pump cylinder body, a pump core and a rotor component, and is characterized in that two ends of the pump cylinder body are respectively connected with a driving end bearing component and a non-driving end bearing component, the rotor component penetrates through the pump cylinder body and is connected with the driving end bearing component and the non-driving end bearing component in a matched mode, the rotor component comprises a pump shaft and a plurality of impellers, each impeller is in interference fit with the pump shaft and is positioned on the pump shaft through a semicircular flange clamping ring, an arc matched with an inlet of the impeller is arranged on the semicircular flange clamping ring, circular fixing sleeves are sleeved on the semicircular flange clamping ring, and the pump core comprises a suction section, a plurality of guide vanes and a plurality of middle sections. The utility model is convenient to assemble, can avoid the gap flow loss between the parts, reduces the manufacturing cost and improves the pump flow and the pump efficiency.

Description

Double-cylinder segment type boiler feed pump

Technical Field

The utility model belongs to the technical field of hydraulic mechanical equipment, and particularly relates to a double-cylinder segmental boiler feed pump.

Background

As is well known, a high pressure boiler feed pump is one of the most important auxiliary machinery equipment of a supercritical and ultra supercritical thermal power generation unit, and is used for bearing the important task of boiler system water supply. The method has very important significance for ensuring the normal continuous and reliable operation of the water supply pump for the stable and efficient operation of the whole power station. With the strong advocate of green, environment-friendly, intelligent and service type manufacturing in the power industry of China, the requirements on the water supply pump of the high-pressure boiler are higher and higher.

The impeller and the pump shaft in the prior art are usually mounted in a way that the impeller is connected with the shaft through a key, and the axial direction is limited by a half-snap ring. Because the operation working condition of the high-pressure boiler water supply pump is changed along with the change of the load of the unit, such as the frequent change of working conditions of flow, lift and the like, the erosion at the impeller inlet and the limited semi-clamping ring is easy to be serious, and the impeller and the semi-clamping ring are difficult to be maintained and disassembled; in addition, a circular concave ring provided with a plurality of groups of metal winding pads is arranged between the last-stage guide vane and the pump rear cover in the prior art, the side surface of the circular concave ring and the end surface of the last-stage guide vane are sealed by adopting a direct contact surface, and a groove is formed on the direct contact surface frequently during maintenance.

Disclosure of Invention

Aiming at the problems, the utility model overcomes the defects of the prior art and provides a double-cylinder segment type boiler feed pump; the utility model is convenient to assemble, can avoid the gap flow loss between the parts, reduces the manufacturing cost and improves the pump flow and the pump efficiency.

In order to achieve the above purpose, the present utility model adopts the following technical scheme.

The utility model provides a double-cylinder segment type boiler feed water pump which comprises a pump cylinder body, a pump core and a rotor component, and is characterized in that two ends of the pump cylinder body are respectively connected with a driving end bearing component and a non-driving end bearing component, the rotor component penetrates through the pump cylinder body and is matched and connected with the driving end bearing component and the non-driving end bearing component, the rotor component comprises a pump shaft and a plurality of impellers, each impeller is in interference fit with the pump shaft and is positioned on the pump shaft through a semicircular flange snap ring, an arc matched with an inlet of the impeller is arranged on the semicircular flange snap ring, circular fixing sleeves are sleeved on the semicircular flange snap ring, the pump core comprises a suction section, a plurality of guide vanes and a plurality of middle sections, all the guide vanes and all the middle sections are distributed along the axial direction and are in one-to-one correspondence with the impellers, adjacent middle sections are positioned through rabbets, each guide vane is positioned with the corresponding middle section, each impeller is positioned in the whole body formed by the guide vane and the pump shaft, the middle section of the head stage is connected with the suction section through a circular groove, the end cover is arranged on the end cover, and the end cover is connected with the end cover.

Further, a balancing mechanism is arranged between the pump rear cover and the pump shaft.

Still further, balance mechanism includes balance drum, balance seat and balance cover, balance drum suit is in on the pump shaft, balance seat with the balance cover all sets up in the pump back lid, balance cover with the balance seat all with balance drum cooperation.

Furthermore, the balance drum is connected with the pump shaft through a key, the balance drum and the pump shaft are axially sealed through an O-shaped sealing ring, and an adjusting pad, a clamping ring and a pressing sleeve for axial positioning are further connected to the balance drum.

Further, the pump cylinder is provided with a suction inlet, a tap inlet, a discharge outlet and a balance water pipe.

Still further, one end of the balance water pipe is communicated with the pump rear cover, and the other end of the balance water pipe is communicated with the inlet of the suction section.

Further, the adjacent middle sections are sealed by direct contact, and the roughness of the contact surface is not lower than RA1.6.

Further, a positioning cylindrical pin is arranged between each guide vane and the corresponding middle section.

Further, the outer edges of the middle section and the suction section of the final stage are also provided with metal winding gaskets.

The utility model has the beneficial effects of.

According to the circular arc provided by the utility model, the hydraulic efficiency of the pump can be improved, and the circular fixing sleeve is arranged on the semicircular flange snap ring and sleeved on the semicircular flange snap ring, so that the circular arc is convenient to assemble, the efficiency is improved, and the loss of parts is avoided. The metal winding sealing gasket is arranged, so that the gap flow loss between the parts can be avoided, the manufacturing cost is reduced, the sealing performance is improved, the pump flow and the pump efficiency are improved, the water supply pump of the high-pressure boiler can be further improved to be stable, efficient and low in failure, continuous and reliable operation is ensured, and the parts are prevented from being damaged and wasted.

Drawings

In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description is presented by way of example only and is not intended to limit the utility model.

FIG. 1 is a schematic cross-sectional view of the overall structure of the present utility model.

Fig. 2 is a schematic view of the utility model in the direction a of fig. 1.

Fig. 3 is an enlarged schematic view of the structure of part B in fig. 1 according to the present utility model.

Fig. 4 is a schematic structural view of a pump core portion of the present utility model.

Fig. 5 is a schematic structural view of a rotor component part of the present utility model.

Fig. 6 is a schematic structural view of a semicircular flange snap ring of the present utility model.

Fig. 7 is a schematic structural view of a vane of the final stage of the present utility model.

The marks in the figure: the pump comprises a pump cylinder body 1, a driving end bearing component 2, a non-driving end bearing component 3, a pump shaft 4, an impeller 5, a semicircular flange snap ring 6, a circular fixing sleeve 7, a suction section 8, a guide vane 9, a middle section 10, an annular groove 11, a metal winding sealing gasket 12, a pump rear cover 13, a pump end cover 14, a balancing drum 15, a balancing seat 16, a balancing sleeve 17, an O-shaped sealing ring 18, an adjusting gasket 19, a snap ring 20, a pressing sleeve 21, a suction inlet 22, a tap opening 23, a discharge outlet 24, a balancing water pipe 25 and a positioning cylindrical pin 26.

Detailed Description

As shown in the accompanying drawings, the present embodiment provides a double-cylinder segment boiler feed pump, which comprises a pump cylinder 1, a pump core and rotor components.

The two ends of the pump cylinder body 1 are respectively connected with a driving end bearing part 2 and a non-driving end bearing part 3, the rotor part penetrates through the pump cylinder body 1 and is matched and connected with the driving end bearing part 2 and the non-driving end bearing part 3, radial bearing bushes are arranged in the driving end bearing part 2 and the non-driving end bearing part 3, and a thrust bearing bush and a speed measuring device are also arranged in the non-driving end bearing part 3.

The rotor component comprises a pump shaft 4 and a plurality of impellers 5, each impeller 5 is in interference fit with the pump shaft 4 and is positioned on the pump shaft 4 through a semicircular flange snap ring 6, an arc matched with an inlet of the impeller 5 is arranged on the semicircular flange snap ring 6, the arc is similar to an inlet streamline of the impeller 5, and the hydraulic efficiency of the pump can be improved.

The semicircular flange snap ring 6 is sleeved with the circular fixing sleeve 7, the circular fixing sleeve 7 is sleeved on the semicircular flange snap ring 6 (grouping snap ring), assembly is convenient, efficiency is improved, and loss of parts is avoided.

The pump core comprises a suction section 8, a plurality of guide vanes 9 and a plurality of middle sections 10, all the guide vanes 9 and all the middle sections 10 are distributed along the axial direction and correspond to the impellers 5 one by one, adjacent middle sections 10 are positioned through rabbets, and the adjacent middle sections 10 are sealed by direct contact and have the roughness of contact surfaces not lower than RA1.6. The guide vanes 9 are positioned with the corresponding middle sections 10 through the rabbets, and positioning cylindrical pins 26 are arranged between each guide vane 9 and the corresponding middle section 10. Each impeller 5 is located inside the whole of the corresponding guide vane 9 and the middle section 10.

The middle section 10 of the first stage is connected with the suction section 8, the middle section 10 of the last stage is provided with an annular groove 11, a metal winding sealing gasket 12 is arranged in the annular groove 11, the corresponding guide vane 9 of the last stage is sealed with the end face of the pump rear cover 13 through the metal winding sealing gasket 12, the outer edges of the middle section 10 of the last stage and the outer edge of the suction section 8 are also provided with the metal winding sealing gasket 12, and the winding gasket can serve as a thermal expansion compensator to improve the sealing performance.

A balance mechanism is arranged between the pump rear cover 13 and the pump shaft 4, the balance mechanism comprises a balance drum 15, a balance seat 16 and a balance sleeve 17, the balance drum 15 is sleeved on the pump shaft 4, the balance drum 15 is connected with the pump shaft 4 through a key, synchronous movement with a rotor part is realized, the balance drum 15 and the pump shaft 4 are axially sealed through an O-shaped sealing ring 18, and an adjusting pad 19, a clamping ring 20 and a pressing sleeve 21 for axial positioning are further connected on the balance drum 15.

The balancing stand 16 and the balancing sleeve 17 are both provided in the pump rear cover 13, and the balancing sleeve 17 and the balancing stand 16 are both fitted with the balancing drum 15.

The pump cylinder 1 is provided with a suction port 22, a tap port 23, a discharge port 24 and a balance water pipe 25, one end of the balance water pipe 25 is communicated with the pump rear cover 13, and the other end of the balance water pipe 25 is communicated with the inlet of the suction section 8. The high-temperature and high-pressure medium at the outer edge of the balance drum 15 is communicated with the medium at the inlet of the suction section 8 through the balance water pipe 25 to form a force opposite to the axial force so as to offset most of the axial force.

The end of the pump cylinder 1 is detachably connected with a pump end cap 14, closing the inside of the pump cylinder 1.

It will be appreciated that the above detailed description of the utility model is provided for illustration of the utility model and not for limitation of the technical solutions described in the embodiments of the utility model, and that the person skilled in the art should understand that the utility model may be modified or substituted for the same technical effects; as long as the use requirement is met, the utility model is within the protection scope of the utility model.

Claims

1. The utility model provides a double-cylinder segment type boiler feed pump, includes pump cylinder (1), pump core, rotor part, its characterized in that, pump cylinder (1) both ends are connected with drive end bearing part (2) and non-drive end bearing part (3) respectively, rotor part pass pump cylinder (1) and with drive end bearing part (2) and non-drive end bearing part (3) cooperation are connected, rotor part includes pump shaft (4) and a plurality of impeller (5), every impeller (5) all with pump shaft (4) interference fit and fix a position on pump shaft (4) through semi-circular flange snap ring (6), be equipped with on semi-circular flange snap ring (6) with the circular arc of impeller (5) entry complex, all overlap on semi-circular flange snap ring (6) and be equipped with circular fixed cover (7), the pump core includes suction section (8), a plurality of stator (9) and a plurality of middle section (10), all stator (9) and all are along axial distribution and with impeller (5) are located and with impeller (10) are located on the pump shaft (4) are located through semi-circular flange snap ring (6) the entrance to one-to-one corresponding stator (10) between impeller (5) and the middle section (10) and the position is located through the middle section (10) and the position that is located with the corresponding one (10), the middle section (10) of the first stage is connected with the suction section (8), the middle section (10) of the last stage is provided with an annular groove (11), a metal winding sealing gasket (12) is arranged in the annular groove (11), the corresponding guide vane (9) of the last stage is sealed with the end face of the pump rear cover (13) through the metal winding sealing gasket (12), and the end part of the pump cylinder (1) is detachably connected with a pump end cover (14).

2. A double-drum segment boiler feedwater pump according to claim 1, characterized in that a balancing mechanism is arranged between the pump rear cover (13) and the pump shaft (4).

3. The double-cylinder segment boiler feed water pump according to claim 2, characterized in that the balancing mechanism comprises a balancing drum (15), a balancing seat (16) and a balancing sleeve (17), the balancing drum (15) is sleeved on the pump shaft (4), the balancing seat (16) and the balancing sleeve (17) are both arranged in the pump rear cover (13), and the balancing sleeve (17) and the balancing seat (16) are both matched with the balancing drum (15).

4. A double-cylinder segment boiler feed water pump according to claim 3 characterized in that the balance drum (15) is in key connection with the pump shaft (4), the balance drum (15) and the pump shaft (4) are axially sealed by an O-shaped sealing ring (18), and an adjusting pad (19), a clamping ring (20) and a pressing sleeve (21) for axial positioning are also connected on the balance drum (15).

5. The double-cylinder segment boiler feed water pump according to claim 1, characterized in that the pump cylinder (1) is provided with a suction inlet (22), a tap (23), a discharge outlet (24) and a balance water pipe (25).

6. A double-drum segment boiler feedwater pump according to claim 5, characterized in that one end of the balance water pipe (25) is in communication with the pump rear cover (13), and the other end of the balance water pipe (25) is in communication with the inlet of the suction section (8).

7. A double-drum segment boiler feedwater pump according to claim 1, characterized in that direct contact sealing is adopted between adjacent intermediate sections (10) and the roughness of the contact surface is not lower than RA1.6.

8. A double-drum segment boiler feedwater pump according to claim 1, characterized in that a locating cylindrical pin (26) is arranged between each guide vane (9) and the corresponding middle section (10).

9. A double-drum segment boiler feedwater pump according to claim 1, characterized in that the outer edges of the intermediate section (10) and the suction section (8) of the final stage are also provided with metal wrap seals (12).