CN220435081U - Novel sealing structure for high-temperature high-pressure molten medium pump - Google Patents
Novel sealing structure for high-temperature high-pressure molten medium pump Download PDFInfo
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- CN220435081U CN220435081U CN202320971904.3U CN202320971904U CN220435081U CN 220435081 U CN220435081 U CN 220435081U CN 202320971904 U CN202320971904 U CN 202320971904U CN 220435081 U CN220435081 U CN 220435081U
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- impeller
- packing
- ring
- shaft
- temperature
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- 238000007789 sealing Methods 0.000 title claims abstract description 39
- 238000012856 packing Methods 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000000945 filler Substances 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000005192 partition Methods 0.000 claims abstract description 13
- 210000004907 gland Anatomy 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 7
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 5
- 239000004917 carbon fiber Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 7
- 239000004202 carbamide Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 229920000877 Melamine resin Polymers 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model provides a novel sealing structure for a high-temperature high-pressure molten medium pump, which comprises a shaft, an impeller, an auxiliary impeller, a partition plate, a shaft sleeve and a packing sealing component, wherein the impeller is arranged at the front end of the shaft; the baffle is fixed on the pump body and is arranged between the impeller and the auxiliary impeller; the shaft sleeve is provided with a fixed table which is assembled on the shaft; the packing sealing assembly comprises a rear cover, a packing box, packing and a packing gland; the packing is assembled between the packing box and the shaft sleeve, and the packing box is provided with a water inlet, a water outlet, a water cooling ring and a packing pressing table. The utility model has the advantages that: the pressure at the sealing position of the filler can be greatly reduced, the temperature of the filler can be reduced, the service life of the filler is prolonged, and the gas distribution ring can effectively prevent the medium in the system from leaking.
Description
Technical Field
The utility model relates to the field of sealing structures of centrifugal pumps, in particular to a mechanical sealing structure for a high-temperature high-pressure molten urea pump.
Background
The low-pressure melamine melting urea pump mainly has the effects that liquid urea at the bottom of a urea washing tower is sent to the top of the urea washing tower for washing process gas, and a small part of liquid urea is sent to a nozzle of a fluidized bed reactor for reaction, so that melamine products, byproduct ammonia gas and carbon dioxide gas are generated, the shaft seal of the melamine melting urea pump is mainly sealed by adopting a molded graphite ring filler, the diameter of a pump shaft of a large-flow melting pump is large, the linear speed of friction between a shaft sleeve and the filler is very high when the pump operates, and is more than 500m/min, high temperature is generated due to friction of the filler, abrasion is serious, the use effect of a shaft seal is always not ideal, the shaft seal is frequently failed, the maintenance cost is greatly increased, the environment is influenced due to leakage of a large amount of highly toxic mediums, and the parking is caused.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model provides a novel sealing structure for a high-temperature high-pressure molten medium pump.
The utility model relates to a novel sealing structure for a high-temperature high-pressure molten medium pump, which comprises a shaft 11, an impeller 14, an auxiliary impeller 15, a baffle 13, a shaft sleeve 12 and a packing sealing component 2, wherein: the impeller 14 is mounted on the front end of the shaft 11, front blades 140 and rear blades 141 are respectively arranged in front of and behind the impeller 14, and the impeller 14 is mounted on the shaft 11; the auxiliary impeller 15 is mounted on the rear side of the impeller 14 and is coaxially mounted on the shaft 11 with the impeller 14, and the rear side of the rear impeller 15 is provided with auxiliary impeller blades 150; the baffle 13 is fixed on the pump body 10 and is arranged between the impeller 14 and the auxiliary impeller 15; the shaft sleeve 12 is provided with a fixed table which is assembled on the shaft 11, and the shaft sleeve 12 is assembled on the shaft 11; the packing seal assembly 2 comprises a rear cover 20, a packing box 21, packing 22 and a packing gland 23; the packing 22 is assembled between the packing 21 and the shaft sleeve 12, the packing 21 is provided with a water inlet 210, a water outlet 211, a water cooling ring 212 and a packing press table 214, wherein the water cooling ring 212 is of an annular cavity structure, and is communicated with the outside of the packing 21 through the water inlet 210 and the water outlet 211.
Further, the air ring 24 is sandwiched between the stuffing 22, and the stuffing box 21 is provided with an air seal 213, and one end of the air seal 213 is connected to the air ring 24, and the other end is connected to the outside of the stuffing box 21.
Further, the front blades 140 of the impeller 14 are clockwise curved blades.
Further, the rear vane 141 of the impeller 14 and the auxiliary vane 150 are straight vanes perpendicular to the center thereof.
Further, the secondary impeller 15 is assembled on the shaft 11 through a key connection, a sealing ring 16 is arranged between the secondary impeller 15 and the shaft sleeve 12, the impeller 14 is assembled on the shaft 11 through a key connection, a sealing ring 16 is arranged between the impeller 14 and the secondary impeller 15, the shaft sleeve 12, the secondary impeller 15 and the impeller 14 are fixed on the shaft 11 through an impeller bolt 142 and an impeller back nut 143, and the sealing ring 16 is arranged between the impeller 14 and the impeller back nut 143.
Further, the rear cover 20 is welded with the stuffing box 21 as a whole, and the rear cover 20 and the partition 13 are assembled to the pump body 10 in a matching manner.
Further, the stud 18 is screwed into a threaded hole 215 of the packing box 21, the packing gland 23 is assembled, and both end surfaces of the packing 22 are pressed by the packing platen 214 and the packing gland 23 by screwing the hexagonal nut 19.
Further, a labyrinth ring 240 is disposed inside the gas distribution ring 24, a ring groove is disposed outside the gas distribution ring 24, the ring groove is connected with the labyrinth ring 240 by a plurality of gas distribution holes 241, and the ring groove is aligned with the gas seal 213 on the stuffing box 21.
Further, the filler 22 is made of carbon fiber woven material.
The utility model has the following advantages: 1. the auxiliary impeller and the partition plate are arranged, and the pressure intensity of a packing seal position is greatly reduced when the pump operates by improving the impeller structure; 2. the stuffing box is provided with a water cooling ring, cooling water flows through the water cooling ring 212 to continuously take away heat generated by friction between the stuffing and the shaft sleeve, so that the stuffing is cooled, and the service life of the stuffing is prolonged; 3. the gas distribution ring has reasonable design structure, the gas distribution holes can reasonably and uniformly distribute sealing gas, and the labyrinth ring can effectively prevent the medium in the system from leaking at the filler; 4. the novel carbon fiber woven material is selected as the filler, so that the novel carbon fiber woven material has better high-temperature resistance, corrosion resistance and wear resistance, the operation time of the high-temperature high-pressure medium pump is greatly prolonged, the overhaul frequency is reduced, and the manpower and material resources are saved.
Drawings
FIG. 1 is a block diagram of the present utility model;
FIG. 2 is a perspective view of the structure of the present utility model;
FIG. 3 is a block diagram of a packing seal;
FIG. 4 is a perspective view of a packing seal;
FIG. 5 is a perspective view of a gas distribution ring;
fig. 6 is an enlarged view of a portion a of fig. 3;
FIG. 7 is a graph showing the direction of flow and pressure distribution of a medium in a pump body;
fig. 8 is an enlarged view of a portion B of fig. 7.
Symbol description in the drawings: 10 pump body; 11 shafts; 12 shaft sleeves; 13 a separator; 14 impellers; 140 front blades; 141 rear blades; 142 impeller bolts; 143 impeller back-to-back; 15 impellers; 150 impeller blades; 16 sealing rings; a 17 bond; 18 studs; a 19 hex nut; 2 a packing seal assembly; 20 rear cover; 21 stuffing box; 210 water inlet; 211 water outlet; 212 water cooling rings; 213 air sealing; 214 a filler press; 215 wire holes; 22 filler; 23 packing gland; 24, distributing a gas ring; 240 labyrinth rings; 241 are distributed with air holes.
Detailed Description
Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, by the following detailed description of the embodiments of the present utility model. It will be apparent that the described examples are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without inventive effort, are intended to be within the scope of the present utility model, based on the examples presented herein.
Embodiment one:
as shown in fig. 1 and 2, a novel sealing structure for a high-temperature high-pressure molten medium pump comprises: a shaft 11, an impeller 14, a secondary impeller 15, a partition plate 13, a shaft sleeve 12 and a packing assembly 2, wherein the impeller 14 is mounted at the front end of the shaft 11, front blades 140 and rear blades 141 are respectively arranged at the front and rear of the impeller 14, and the impeller 14 is assembled on the shaft 11; the auxiliary impeller 15 is mounted on the rear side of the impeller 14 and is coaxially mounted on the shaft 11 with the impeller 14, and the rear side of the rear impeller 15 is provided with auxiliary impeller blades 150; the baffle 13 is fixed on the pump body 10 and is arranged between the impeller 14 and the auxiliary impeller 15; the sleeve 12 is provided with a fixed table fitted on the shaft 11, the sleeve 12 being fitted on said shaft 11, said fixed table realizing an axial positioning between the two; a packing seal assembly 2 comprising a rear cover 20, a packing box 21, packing 22, and a packing gland 23; the packing 22 is assembled between the packing 21 and the shaft sleeve 12, the packing 21 is provided with a water inlet 210, a water outlet 211, a water cooling ring 212 and a packing press table 214, wherein the water cooling ring 212 is of an annular cavity structure, the water inlet 210 and the water outlet 211 are communicated with the outside of the packing 21, and the water inlet 210 and the water outlet 211 are connected with a cooling water source in operation.
As shown in fig. 1 and 2, the front blades 140 of the impeller 14 are curved blades rotating clockwise, and when the impeller rotates rapidly, the medium flies around from the center due to centrifugal force, a low pressure is formed at the center of the impeller 14, the medium is continuously sucked in, and high pressure is formed around the impeller 14 as the medium is continuously accumulated, at this time, a part of the high pressure medium is discharged from the pump, and a part of the high pressure medium flows to the rear of the impeller 14. The rear vane 141 of the impeller 14 and the auxiliary vane 150 are straight vanes perpendicular to the central axis, and when rotating, part of the high pressure medium flowing to the packing seal position through the rear of the impeller 14 can be pumped back to the pump outlet, so that the pressure of the medium at the packing seal position can be greatly reduced, and the function of balancing the axial force is achieved. The rear cover 20 and the stuffing box 21 are welded into a whole, meanwhile, the rear cover 20 and the partition 13 are assembled in the pump body 10 in a matched mode, the partition 13 is fixed in the pump body 10 and arranged between the impeller 14 and the auxiliary impeller 15, a reasonable flow passage is provided for medium in the pump, and stable operation of the pump is guaranteed.
As shown in fig. 3 and 4, the secondary impeller 15 is assembled on the shaft 11 through a key 17, a sealing ring 16 is arranged between the secondary impeller 15 and the shaft sleeve 12, the impeller 14 is assembled on the shaft 11 through the key 17, a sealing ring 16 is arranged between the impeller 14 and the secondary impeller 15, and the shaft sleeve 12, the secondary impeller 15 and the impeller 14 can be firmly fixed on the shaft 11 through an impeller bolt 142 and an impeller nut 143. In addition, a seal 16 is disposed between the impeller 14 and the impeller nut 143. The stuffing box 21 is provided with a water inlet 210, a water outlet 211, a water cooling ring 212, an air seal 213, a stuffing press table 214 and a screw hole 215. The packing 22 is fitted between the packing 21 and the sleeve 12. The packing 22 is clamped with a gas distribution ring 24, as shown in fig. 5 and 6, the inner side of the gas distribution ring 24 is provided with a labyrinth ring 240, the outer side of the gas distribution ring 24 is provided with a ring groove, the ring groove is connected with the labyrinth ring 240 by a plurality of gas distribution holes 241, the gas distribution holes are not fixedly connected with gas seal openings, after the packing seal assembly is assembled, the gas seal 213 on the packing box 21 and the ring groove are positioned on the same section, the mutual alignment of the ring groove and the gas seal 213 is ensured, one end of the gas seal 213 is communicated with the gas distribution ring 24, and the other end is communicated with the outside of the packing box 21. The sealing gas entering from the gas seal 213 firstly enters the ring groove, then enters the inner groove of the gas distribution ring through the gas distribution holes 241 and then is distributed to the labyrinth ring, so that a certain sealing force can be provided for the filler at the labyrinth ring.
The air seal 213 is provided with internal threads for connecting an external air source pipe, and the sealing effect of the filler 22 can be better after the sealing air is filled.
The stud 18 is screwed into a threaded hole 215 of the stuffing box 21, the packing gland 23 is assembled, and the hexagonal nut 19 is screwed, so that the two end surfaces of the packing 22 are pressed by the packing press table 214 and the packing gland 23, and a seal is formed between the shaft sleeve 12 and the packing 22. The water cooling ring 212 can effectively take away heat generated by friction between the filler 22 and the shaft sleeve 12, can prolong the service life of the filler 22, and has better high temperature resistance, corrosion resistance and wear resistance due to the fact that the filler 22 is made of carbon fiber woven materials.
The working principle of the utility model is as follows: with reference to fig. 1-6, the shaft 11 drives the impeller 14 to rotate rapidly, the medium is scattered from the center to the periphery due to centrifugal force, low pressure is formed at the center of the impeller 14, the medium is continuously sucked in, the periphery of the impeller 14 continuously accumulates with the medium to form high pressure, at this time, a part of the high pressure medium is discharged by the pump outlet, the other part flows to the rear of the impeller 14, the partition 13 is positioned between the impeller 14 and the auxiliary impeller 15, and the gaps between the partition 13 and the impeller 14 and between the partition 13 and the auxiliary impeller 15 can be adjusted by reasonably designing the position and the thickness of the partition 13, so that a reasonable medium flow channel is formed. In the present embodiment, as shown in fig. 7 and 8, if there is no partition 13, or if the clearance between the partition 13 and the impeller 14 and the impeller 15 is too large, the impeller 15 and the impeller rear vane 141 are deactivated, and the pressure at the packing increases. The medium flowing to the rear of the impeller 14 can return to the pump outlet under the high-speed rotation action of the auxiliary impeller 15 and the impeller rear blades 141, so that the pressure of the medium at the sealing position of the filler 22 is greatly reduced, the shaft sleeve 12 is fixed on the shaft 11 and rotates along with the shaft 11 at a high speed, heat is generated by friction between the filler 22 and the shaft sleeve 12, cooling water enters from the filler box water inlet 210, flows through the water cooling ring 212 and then flows out from the water outlet 211, the heat generated by friction between the filler 22 and the shaft sleeve 12 is continuously taken away, the gas sealing is carried out by the gas distributing ring 24, the filler 22 is made of materials which are more high-temperature resistant, corrosion resistant and wear resistant, and the service life of the high-temperature high-pressure medium pump is greatly prolonged.
The above description is only a preferred embodiment of the present utility model, and is not intended to limit the scope of the present utility model, and any person skilled in the art can make equivalent changes to the present utility model by using the above technical solutions without departing from the scope of the present utility model. The protection scope of the present utility model is subject to what is recited in the claims.
Claims (9)
1. A novel sealing structure for a high-temperature high-pressure molten medium pump is characterized in that: including axle (11), impeller (14), vice impeller (15), baffle (13), axle sleeve (12), packing seal assembly (2), wherein:
the impeller (14) is arranged at the front end of the shaft (11), and a front blade (140) and a rear blade (141) are respectively arranged at the front and the rear of the impeller (14); the auxiliary impeller (15) is arranged at the rear side of the impeller (14) and is coaxially arranged on the shaft (11) with the impeller (14), and auxiliary impeller blades (150) are arranged at the rear side of the auxiliary impeller (15); the baffle plate (13) is fixed on the pump body (10) and is arranged between the impeller (14) and the auxiliary impeller (15); the shaft sleeve (12) is provided with a fixed table which is assembled on the shaft (11); the packing sealing assembly (2) comprises a rear cover (20), a packing box (21), packing (22) and a packing gland (23); the packing (22) is assembled between the packing box (21) and the shaft sleeve (12), the packing box (21) is provided with a water inlet (210), a water outlet (211), a water cooling ring (212) and a packing pressing table (214), wherein the water cooling ring (212) is of an annular cavity structure, and is communicated with the outside of the packing box (21) through the water inlet (210) and the water outlet (211).
2. The novel sealing structure for a high-temperature and high-pressure molten medium pump according to claim 1, wherein: a gas distribution ring (24) is clamped between the fillers (22), a gas seal (213) is arranged on the stuffing box (21), one end of the gas seal (213) is communicated with the gas distribution ring (24), and the other end of the gas seal is communicated with the outside of the stuffing box (21).
3. The novel sealing structure for a high-temperature and high-pressure molten medium pump according to claim 1, wherein: the front blade (140) of the impeller (14) is a clockwise rotation curved blade.
4. The novel sealing structure for a high-temperature and high-pressure molten medium pump according to claim 1, wherein: the rear blades (141) of the impeller (14) and the auxiliary impeller blades (150) are all straight blades perpendicular to the central axis thereof.
5. The novel sealing structure for a high-temperature and high-pressure molten medium pump according to claim 1, wherein: the auxiliary impeller (15) is assembled on the shaft (11) through key connection, a sealing ring (16) is arranged between the auxiliary impeller and the shaft sleeve (12), the impeller (14) is assembled on the shaft (11) through key connection, a sealing ring (16) is arranged between the impeller (14) and the auxiliary impeller (15), the shaft sleeve (12), the auxiliary impeller (15) and the impeller (14) are fixed on the shaft (11) through an impeller bolt (142) and an impeller nut (143), and the sealing ring (16) is arranged between the impeller (14) and the impeller nut (143).
6. The novel sealing structure for a high-temperature and high-pressure molten medium pump according to claim 1, wherein: the rear cover (20) and the stuffing box (21) are welded into a whole, and the rear cover (20) and the partition plate (13) are assembled on the pump body (10) in a matching way.
7. The novel sealing structure for a high-temperature and high-pressure molten medium pump according to claim 1, wherein: the packing box further comprises a stud (18), the stud (18) is screwed into a threaded hole (215) of the packing box (21), a packing gland (23) is assembled, and two end faces of the packing (22) are pressed by the packing gland (214) and the packing gland (23) through screwing a hexagonal nut (19).
8. The novel sealing structure for a high-temperature and high-pressure molten medium pump according to claim 2, wherein: the inner side of the gas distribution ring (24) is provided with a labyrinth ring (240), the outer side of the gas distribution ring (24) is provided with a ring groove, the ring groove is connected with the labyrinth ring (240) through a plurality of gas distribution holes (241), and the ring groove is mutually aligned with a gas seal (213) on the stuffing box (21).
9. The novel sealing structure for a high-temperature and high-pressure molten medium pump according to claim 1, wherein: the filler (22) is made of carbon fiber woven materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320971904.3U CN220435081U (en) | 2023-04-26 | 2023-04-26 | Novel sealing structure for high-temperature high-pressure molten medium pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320971904.3U CN220435081U (en) | 2023-04-26 | 2023-04-26 | Novel sealing structure for high-temperature high-pressure molten medium pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220435081U true CN220435081U (en) | 2024-02-02 |
Family
ID=89695911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320971904.3U Active CN220435081U (en) | 2023-04-26 | 2023-04-26 | Novel sealing structure for high-temperature high-pressure molten medium pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220435081U (en) |
-
2023
- 2023-04-26 CN CN202320971904.3U patent/CN220435081U/en active Active
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240623 Address after: No. 1 Hengsheng Road, Coal Power Port Chemical Industrial Park, Jiangling Economic Development Zone, Jingzhou City, Hubei Province, China, 434199 Patentee after: Hualu Hengsheng (Jingzhou) Co.,Ltd. Country or region after: China Address before: The German city of Shandong province Dezhou City Tianqu road 253024 No. 24 Patentee before: SHANDONG HUALU-HENGSHENG CHEMICAL INDUSTRIAL STOCK Co.,Ltd. Country or region before: China |