CN216008883U - Tensioning sealing assembly structure of water feeding pump of million-grade boiler - Google Patents

Abstract

The utility model relates to a taut seal assembly structure of million grades of boiler feed pump. At present, a million-level boiler feed pump not only needs to stably operate for a long time under the working conditions of large flow and high lift, but also meets the requirement of deep peak shaving, and the high safety and reliability of the million-level boiler feed pump become the operating indexes of the million-level boiler feed pump. A million-grade boiler feed pump tensioning sealing assembly structure comprises a tensioning ring (1), a stud A (3), a stud B (4), a standard nut (2), a custom nut (5) and a forming seal (6); the tensioning ring (1) is installed on the outer side of a driving end of the pump body, 20 high-strength studs are uniformly distributed on the outer ring of the tensioning ring and the cylinder body (8), the studs are uniformly distributed on the inner ring of the tensioning ring and fixed on the water inlet chamber (7), and meanwhile, the customized nut (5) is adopted to be installed and disassembled in order to leave enough space. The utility model discloses be applied to the boiler field.

Description

Tensioning sealing assembly structure of water feeding pump of million-grade boiler

Technical Field

The utility model relates to a boiler feed pump sealing technique field, concretely relates to taut seal assembly structure of 1000MW grade boiler feed pump.

Background

The 'big top pressure' of domestic thermal power is gradually developing to a million-grade ultra-supercritical unit with high capacity, high parameter and high efficiency, and an advanced clean, high-efficiency and low-carbon coal-fired power generation technology is still the demand for maintaining national strategic energy. The boiler feed pump is the most central auxiliary equipment in a power plant, and is used for boosting the pressure of high-temperature water subjected to heating and oxygen removal to a certain rated pressure and then sending the water to a boiler. The million-level boiler feed pump not only needs to stably operate for a long time under the working conditions of large flow and high lift, but also meets the requirement of deep peak shaving, and the high safety and the reliability of the million-level boiler feed pump become the operating indexes of the million-level boiler feed pump.

Disclosure of Invention

The utility model aims at providing a taut seal assembly structure of million grades of boiler feed pump has overcome the problem that barrel and intake chamber hard seal easily revealed, has solved the work that changes the sealing member and need take out core package, has portably installed and has dismantled, and sealing performance is good, has improved the stability of million grades of boiler feed pump operation greatly.

The above purpose is realized by the following technical scheme:

a million-class boiler feed pump tensioning sealing assembly structure comprises: the water inlet device comprises a tensioning ring, a stud A, a stud B, a standard nut, a custom nut and a forming seal, wherein the outer ring of the tensioning ring is connected with a cylinder body through the stud A and the standard nut, the inner ring of the tensioning ring is connected with a water inlet chamber through the stud B and the custom nut, and the seam allowance of the tensioning ring is compressed, formed and sealed; the tensioning ring is arranged on the outer side of the driving end of the pump body, 20 high-strength studs are uniformly distributed on the cylinder body at the outer ring, and the studs at the inner ring are uniformly distributed and fixed on the water inlet chamber.

The tensioning ring is made of stainless steel, the stop is matched with the barrel in the same size f7/H7, and is matched with the water inlet chamber in the same size H7/g6, so that sufficient clearance is guaranteed, and meanwhile, the sealing performance and the convenience in disassembly and assembly are considered.

The million-grade boiler feed pump tensioning sealing assembly structure is characterized in that the forming seal is made of pure graphite. High temperature resistance and high pressure resistance; the surface pressure during gasket assembly was 25N/mm2, the maximum uncompressed gasket density was 1.37g/cm3, and the gasket density after compression was 1.663g/cm 3.

The tensioning sealing assembly structure of the million-grade boiler feed pump is characterized in that the customized nut is subjected to 35CrMoA tempering and blackening treatment, the nut lengthening design ensures that the inner ring and the outer ring have enough dislocation space, and the application of special tool torque load is ensured.

The utility model has the advantages that:

1. the utility model discloses satisfy pump entrance point high temperature, high pressure feedwater sealing performance's demand, its compact structure, it is sealed good, easy dismounting in enough little space changes the sealing member and need not the package operation of loosing core, improves labor efficiency.

2. The utility model adopts pure graphite molding sealing, has high pressure resistance and high temperature resistance, isolates the water supply leakage of the pump body, and improves the leakage problem caused by the hard sealing of the cylinder body and the end part of the water inlet end; the customized nut structure effectively solves the problem of limited installation space and is convenient for operators to disassemble and assemble; the utility model discloses the taut seal assembly of pump installation is convenient with the dismantlement, and is sealed respond well, and the field work load that has significantly reduced has improved security, the reliability of operation.

3. The working process is as follows:

(1) core package disassembly: and (4) dismounting nuts of the inner and outer ring stud bolts, which are connected with the inlet chamber and the cylinder body, of the pump driving end tensioning ring. And an eye bolt is screwed in the threaded hole at the top end of the tensioning ring. The lifting bolt is provided with a rope, and is matched with proper lifting equipment, so that the lifting equipment is adjusted, and the effective support of the tensioning ring is ensured. The tension ring is carefully removed from the pump body and core package and placed in the appropriate area and the hoisting device removed.

(2) Installing a core package: and an eye bolt is screwed in the threaded hole at the top end of the tensioning ring. And (4) installing a rope on the lifting bolt and matching with proper hoisting equipment. The tension ring is suspended into the bearing housing at the drive end, aligned with the inner and outer ring studs connecting the inlet chamber and the barrel, and mounted in place. And (4) screwing a nut on the outer ring (pump barrel side) stud, and uniformly screwing the stud to a required torque value to fix the position of the core package. And (4) screwing nuts on the stud bolts of the inner ring (on the side of the inlet chamber) and uniformly screwing the studs to a required torque value.

Description of the drawings:

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

Fig. 2 is a schematic diagram of a custom nut.

Fig. 3 is a schematic view of the tension ring.

Fig. 4 is a left side view of fig. 2.

In the figure: 1-tensioning a ring; 2-standard nut; 3-stud a; 4-stud B; 5-customizing the nut; 6-forming and sealing, 7-water inlet chamber, 8-cylinder, 9-inner pull hole, 10-outer pull hole, 11, lifting hole, 12-jacking hole.

The specific implementation mode is as follows:

example 1:

a million-grade boiler feed pump tensioning sealing assembly structure comprises a tensioning ring (1), a stud A (3), a stud B (4), a standard nut (2), a custom nut (5) and a forming seal (6); the tensioning ring (1) is arranged on the outer side of the driving end of the pump body, 20 high-strength studs are uniformly distributed on the outer ring of the tensioning ring and the cylinder body (8), the studs on the inner ring of the tensioning ring are uniformly distributed and fixed on the water inlet chamber (7), and meanwhile, the customized nut (5) is adopted to leave enough space for mounting and dismounting;

the tensioning ring (1), the cylinder body and the water inlet chamber are compressed through the pure graphite forming seal (6) to play a sealing role, the forming seal compression amount is 15% of the original thickness during first installation, and the forming seal rebound amount is 10% of the compressed thickness after decompression.

The tensioning ring (1) is in contact positioning with the end face of the barrel, the spigot is in clearance fit with the barrel and the water inlet chamber respectively in the radial direction, the replacement, the molding and the sealing are convenient, and the core bag does not need to be drawn out.

Example 2:

referring to fig. 1, a schematic structural diagram of a million-class boiler feed pump tensioning seal assembly is shown, and the million-class boiler feed pump tensioning seal assembly comprises a tensioning ring (1), a stud A (3), a stud B (4), a standard nut (2), a custom nut (5) and a forming seal (6). The outer ring of the tensioning ring (1) is connected with the side of the barrel through a stud A (3) and a standard nut (2), the inner ring of the tensioning ring is connected with the side of the water inlet chamber through a stud (4) and a custom nut (5), and the forming seal (6) of the seam allowance of the tensioning ring (1) is compressed according to the stud pre-tightening force loads of the inner ring and the outer ring, so that high-temperature and high-pressure water at the inlet of a boiler feed pump is prevented from leaking outwards, and the sealing and isolating effects are further achieved.

Referring to fig. 2, a schematic diagram of a customized nut of a million-grade boiler feed pump tensioning sealing assembly is shown, and the customized nut (5) is lengthened to ensure that sufficient dislocation space is provided when the inner and outer ring nuts are installed, so that the application of special tool torque load is facilitated.

Referring to figure 3 there is shown a schematic drawing of a mega-grade boiler feed water pump tensioned seal assembly tensioning ring,

20 stud through holes are uniformly distributed in the inner ring and the outer ring of the tensioning ring (1), 1M 20 lifting hole is formed in the top of the tensioning ring, and 4M 20 jack thread through holes are arranged in the inner ring of the tensioning ring so as to facilitate field disassembly, installation and adjustment.

Claims (4)

1. A million-class boiler feed pump tensioning sealing assembly structure comprises: tensioning ring, stud A, stud B, standard nut, customization nut and shaping are sealed, characterized by: the outer ring of the tensioning ring is connected with the cylinder body through the stud A and the standard nut, the inner ring of the tensioning ring is connected with the water inlet chamber through the stud B and the customized nut, and the seam allowance of the tensioning ring is compressed, molded and sealed;

the tensioning ring is arranged on the outer side of the driving end of the pump body, 20 high-strength studs are uniformly distributed on the cylinder body at the outer ring, and the studs at the inner ring are uniformly distributed and fixed on the water inlet chamber.

2. The tightening sealing assembly structure of a million-class boiler feed pump according to claim 1, characterized in that: the tensioning ring is made of stainless steel, and the stop opening is matched with the barrel body in the same size f7/H7 and the water inlet chamber in the same size H7/g 6.

3. The tightening sealing assembly structure of a million-class boiler feed pump according to claim 1, characterized in that: the molding seal is made of pure graphite.

4. The tightening sealing assembly structure of a million-class boiler feed pump according to claim 1, characterized in that: the custom nut is made of 35 CrMoA.

Images