CN213039475U

CN213039475U - High-temperature, high-pressure, single-shell boiler feed pump

Info

Publication number: CN213039475U
Application number: CN202021946453.0U
Authority: CN
Inventors: 杨立; 冯岩; 张铁; 王建宁; 孙健
Original assignee: DALIAN DEEP BLUE PUMP CO LTD
Current assignee: DALIAN DEEP BLUE PUMP CO LTD
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2021-04-23
Anticipated expiration: 2030-09-08

Abstract

The utility model provides a high-temperature, high-pressure, single-shell boiler feed pump, which comprises a suction section, a middle section, an impeller, a guide vane, an outlet section, a shaft coupling, a pump shaft, a balance part, a drive end bearing part, a drive end sealing part, a balance pipe assembly, a non-drive end sealing part and a non-drive end bearing part, wherein the suction section is connected with the middle section which is connected with the outlet section, and the guide vane is arranged on the middle section; the impeller comprises a primary impeller and a secondary impeller which are both connected with the pump shaft in a matching way; the left side of the pump shaft is connected with a driving end sealing part, a driving end bearing part and a coupling, and the right side of the pump shaft is connected with a balance part, a non-driving end sealing part and a non-driving end bearing part; the middle section and the outlet section both adopt forging structures; the first-stage impeller adopts a double-suction structure; the boiler feed pump is provided with an inlet and a plurality of outlets. The utility model discloses a manufacturing process is ripe, installation, maintenance, detection are more convenient, and the security is higher.

Description

High-temperature, high-pressure, single-shell boiler feed pump

Technical Field

The utility model relates to a boiler feed pump technical field especially relates to a high temperature, high pressure, single casing boiler feed pump.

Background

The boiler feed pump is used for conveying medium deoxygenated water and is a key device in a boiler system in the petrochemical industry. The boiler feed pump is used for lifting the deoxygenated water with a certain temperature to the pressure required by the process and conveying the deoxygenated water to the boiler so as to meet the requirement of the boiler water. In a boiler system in the petrochemical industry, a boiler feed pump is a main guarantee of the pressure of a hydrodynamic system. The boiler feed water pump device can guarantee stable performance, stable pump operation, can to a great extent reduce boiler system risk, guarantees boiler system's stability and security.

The conveying medium of the boiler feed pump is deoxygenated water which has great corrosivity. A traditional boiler feed water pump is connected with a pressure-bearing part, and a corrosion leakage site often appears. In order to ensure that the boiler feed pump has no leakage and ensure the safety of a hydrodynamic system, the structure of the boiler feed pump is designed and the materials are upgraded.

Accordingly, in view of the above, there is a need for a new boiler feedwater pump that addresses the deficiencies of the prior art.

SUMMERY OF THE UTILITY MODEL

In light of the above-identified problems, a high temperature, high pressure, single casing boiler feed water pump is provided. The utility model mainly utilizes the middle section and the outlet section to adopt the forging structure to bear the high temperature and high pressure of the medium; sealing the internal high-temperature medium by adopting O-shaped rings made of special materials between the pressure-bearing shells; the first-stage impeller is in a double-suction structure, so that the required cavitation allowance NPSHr of the pump is reduced, the requirement on the cavitation allowance NPSHA of the device is reduced, and the cost of the device is reduced; the boiler feed pump is provided with an inlet and a plurality of outlets, so that the purpose that one pump realizes multipoint and multi-working condition pressure supply is achieved. The utility model discloses a technical means as follows:

a high temperature, high pressure, single casing boiler feed water pump comprising: the centrifugal pump comprises a suction section, a middle section, an impeller, a guide vane, an outlet section, a coupling, a pump shaft, a balance part, a driving end bearing part, a driving end sealing part, a balance pipe assembly, a non-driving end sealing part and a non-driving end bearing part, wherein the suction section is connected with the middle section, the middle section is connected with the outlet section, and the guide vane is arranged on the middle section; the impeller comprises a primary impeller and a secondary impeller which are both connected with the pump shaft in a matching way; the left side of the pump shaft is sequentially connected with the driving end sealing part, the driving end bearing part and the coupler from right to left, and the right side of the pump shaft is sequentially connected with the balance part, the non-driving end sealing part and the non-driving end bearing part from left to right; the balance tube assembly is mounted between the suction section and the non-drive-end seal member;

the middle section and the outlet section are of forged piece structures and bear high temperature and high pressure of a medium, wherein the middle section is made of a middle section forged piece, the outlet section is made of an outlet section forged piece and an outlet flange forged piece, the outlet flange forged piece is welded above the outlet section forged piece, raw materials of the outlet section forged piece and the outlet flange forged piece are subjected to ultrasonic monitoring, the internal structure of the material is monitored in the raw material stage, and the quality of parts is guaranteed;

the primary impeller adopts a double-suction structure, so that the cavitation allowance NPSHr required by the pump is reduced, and the requirement on the cavitation allowance NPSHA of the device is reduced;

the boiler water feeding pump is provided with an inlet and a plurality of outlets, so that the purpose that one pump realizes multi-point and multi-working-condition pressure supply is achieved; the inlet is arranged on the suction section, and the outlets are respectively arranged on the middle section and the outlet section.

Furthermore, the O-shaped rings are adopted between the pressure-bearing shells to seal the internal high-temperature medium, so that the medium leakage is avoided;

the pressure-bearing shell is arranged between two adjacent middle sections and between the middle section and the outlet section.

Furthermore, the O-shaped ring is made of special materials, and the special materials are ethylene propylene diene monomer.

Furthermore, at the position of the shaft head of the pump shaft, the pump shaft is connected with the coupler in a keyless mode, the generation of misalignment of a rotor is reduced, the unbalance amount of the rotor is reduced, and the stability of the unit is enhanced.

Compared with the prior art, the utility model has the advantages of it is following:

1. the utility model provides a high-temperature, high-pressure and single-shell boiler feed pump, the middle section and the outlet section pressure-bearing shell adopt forgings to bear the high-temperature and high-pressure medium; an O-shaped ring made of special materials is adopted between the pressure-bearing shells to seal the internal high-temperature medium, so that the medium leakage is avoided; the shaft head position, the shaft and the shaft coupling are connected in a keyless mode, the generation of misalignment of the rotor is reduced, the unbalance amount of the rotor is reduced, and the stability of the unit is enhanced.

2. The utility model provides a high-temperature, high-pressure, single-shell boiler feed pump, which is provided with an inlet and a plurality of outlets, and one pump can realize multi-point and multi-working condition pressure supply; the first-stage impeller adopts a double-suction structure, so that the required cavitation allowance NPSHr of the pump is reduced, the requirement on the cavitation allowance NPSHA of the device is reduced, and the cost of the device is reduced.

3. The utility model provides a high temperature, high pressure, single casing boiler feed pump, application new design method upgrades traditional pump structure, has realized reduce cost, improves advantages such as device security.

4. The high-temperature, high-pressure and single-shell boiler feed pump provided by the utility model has the advantages of mature manufacturing process, more convenient installation, maintenance and detection, higher safety and capability of meeting the requirements of low-pressure, medium-pressure and high-pressure high-temperature deoxidization water medium conveying work in the industries of petrochemical industry, coal chemical industry and the like; the series of boiler water pumps provide low-pressure, medium-pressure and high-pressure boiler water pump products; the series of boiler water pumps run safely and stably, the representation shows that the domestic boiler water pumps are excellent in performance on the stations, play the role of a prime force and have great social value.

Based on the above reason the utility model discloses can extensively promote in fields such as petrochemical, coal chemical industry, self-contained power plant.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the middle section of the present invention.

Fig. 3 is the utility model discloses a structural schematic of middle section forging.

Fig. 4 is a schematic structural diagram of the middle outlet section of the present invention.

Fig. 5 is the utility model discloses well outlet section forging's structural schematic.

Fig. 6 is the utility model discloses well flange forging's structural schematic.

Fig. 7 is the sealing schematic diagram of the O-ring of the middle pressure-bearing shell of the present invention.

Fig. 8 is the key-free connection schematic diagram of the middle pump shaft and the shaft coupling of the present invention.

Fig. 9 is a schematic structural view of the middle-first-stage double-suction impeller of the present invention.

Fig. 10 is a schematic view of an inlet and a plurality of outlets in the present invention.

In the figure: 1. a coupling; 2. a drive end bearing member; 3. a suction section; 4. a middle section; 5. a secondary impeller; 6. a guide vane; 7. a pump shaft; 8. an outlet section; 9. a balance tube assembly; 10. a non-drive end bearing component; 11. a non-drive-end seal member; 12. a balance member; 13. a first stage impeller; 14. a drive end seal member; 15. an O-ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-10, the utility model provides a high temperature, high pressure, single casing boiler feed pump, include: the device comprises a suction section 3, a middle section 4, an impeller, a guide vane 6, an outlet section 8, a coupling 1, a pump shaft 7, a balance part 12, a driving end bearing part 2, a driving end sealing part 14, a balance pipe assembly 9, a non-driving end sealing part 11 and a non-driving end bearing part 10, wherein the suction section 3 is connected with the middle section 4, the middle section 4 is connected with the outlet section 8, and the guide vane 6 is arranged on the middle section 4; the impeller comprises a primary impeller 13 and a secondary impeller 5 which are both connected with the pump shaft 7 in a matching way, wherein the primary impeller 13 adopts a double-suction structure, so that the cavitation allowance NPSHr required by the pump is reduced, and the requirement on the cavitation allowance NPSHA of the device is reduced; the left side of pump shaft 7 from right to left has connected gradually drive end seal part 14 drive end bearing unit 2 with shaft coupling 1, wherein, the spindle nose position of pump shaft 7, pump shaft 7 with shaft coupling 1 does not have the key-type connection, reduces the rotor and does not center the production, reduces rotor unbalance amount, strengthens unit stability under high temperature, the high-pressure operating mode. The balance part 12, the non-driving end sealing part 11 and the non-driving end bearing part 10 are connected to the right side of the pump shaft 7 from left to right in sequence. The balance tube assembly 9 is mounted between the suction section 3 and the non-drive end seal part 11.

The middle section 4 and the outlet section 8 both adopt forging structures and bear high temperature and high pressure of a medium, wherein the middle section 4 is made of a middle section forging which is a raw material for processing the middle section 4 and belongs to a process raw material; the outlet section 8 is formed by manufacturing an outlet section forging and an outlet flange forging, the outlet flange forging is welded above the outlet section forging, the outlet section forging and the outlet flange forging raw materials are subjected to ultrasonic monitoring, the internal structure of the materials is monitored in the raw material stage, the quality of parts is guaranteed, and the outlet section forging and the flange forging are processed into the raw materials of the outlet section 8.

The boiler water feeding pump is provided with an inlet and a plurality of outlets, and one pump can realize multipoint and multi-working condition pressure supply; the inlet is arranged on the suction section 3, and the outlets are respectively arranged on the middle section 4 and the outlet section 8.

An O-shaped ring 15 is adopted between the pressure-bearing shells to seal the internal high-temperature medium, so that the medium leakage is avoided. The pressure-bearing shell is between two adjacent middle sections 4 and between the middle sections 4 and the outlet section 8, namely the pressure-bearing shell is composed of the middle sections 4 and the outlet section 8. Wherein, the O-shaped ring 15 is made of special material, and the special material is ethylene propylene diene monomer.

The utility model discloses a boiler feed pump mainly used carries low pressure, middling pressure, high pressure high temperature oxygen-removed water. Typical working conditions are used for boiler feed pumps in hydrogenation feeding devices, boiler feed pumps of acrylic acid and acrylic ester devices, boiler feed pumps of synthetic gas-to-ethylene glycol coproduction dimethyl carbonate projects, boiler feed pumps of ethylene glycol projects, boiler feed pumps of sulfuric acid devices and the like.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A high temperature, high pressure, single shell boiler feed pump, comprising: the device comprises a suction section (3), a middle section (4), an impeller, a guide vane (6), an outlet section (8), a coupler (1), a pump shaft (7), a balance part (12), a driving end bearing part (2), a driving end sealing part (14), a balance pipe assembly (9), a non-driving end sealing part (11) and a non-driving end bearing part (10), wherein the suction section (3) is connected with the middle section (4), the middle section (4) is connected with the outlet section (8), and the guide vane (6) is arranged on the middle section (4); the impeller comprises a primary impeller (13) and a secondary impeller (5) which are both connected with the pump shaft (7) in a matching way; the driving end sealing part (14), the driving end bearing part (2) and the coupler (1) are sequentially connected to the left side of the pump shaft (7) from right to left, and the balance part (12), the non-driving end sealing part (11) and the non-driving end bearing part (10) are sequentially connected to the right side of the pump shaft (7) from left to right; the balance tube assembly (9) is mounted between the suction section (3) and the non-drive end seal part (11);

the middle section (4) and the outlet section (8) are of forged piece structures and bear high temperature and high pressure of a medium, wherein the middle section (4) is made of a middle section forged piece, the outlet section (8) is made of an outlet section forged piece and an outlet flange forged piece, the outlet flange forged piece is welded above the outlet section forged piece, the outlet section forged piece and the outlet flange forged piece are subjected to ultrasonic monitoring on raw materials, the internal structure of the materials is monitored in the raw material stage, and the quality of parts is guaranteed;

the primary impeller (13) adopts a double-suction structure, so that the cavitation allowance NPSHr required by the pump is reduced, and the requirement on the cavitation allowance NPSHA of the device is reduced;

the boiler water feeding pump is provided with an inlet and a plurality of outlets, so that the purpose that one pump realizes multi-point and multi-working-condition pressure supply is achieved; the inlet is arranged on the suction section (3), and the outlets are respectively arranged on the middle section (4) and the outlet section (8).

2. A high temperature, high pressure, single casing boiler feed pump as claimed in claim 1, wherein O-rings (15) are used between the pressure-bearing casings to seal the high temperature medium inside to avoid leakage of the medium;

the pressure-bearing shell is arranged between two adjacent middle sections (4) and between the middle sections (4) and the outlet section (8).

3. The high-temperature, high-pressure, single-casing boiler feed pump of claim 1, characterized in that at the position of the shaft head of the pump shaft (7), the pump shaft (7) is connected with the shaft coupling (1) in a keyless manner, thereby reducing the generation of misalignment of the rotor, reducing the unbalance amount of the rotor and enhancing the stability of the unit.