CN108343615A - A kind of methanol feed pump - Google Patents

Abstract

The invention discloses a kind of methanol feed pumps, including bearing housing, bearing housing is connected with pump holder, bearing housing one end is provided with pump protecgulum, it is provided with pump middle cover between pump protecgulum and bearing housing, pump middle cover is connect with pump protecgulum and bearing housing by screw respectively, pump case has been bolted in pump middle cover, pump case is contacted with pump protecgulum, main shaft is provided in bearing housing, main shaft one end passes through pump protecgulum to be located in pump case, the main shaft other end is connected with driven shaft one end, the driven shaft other end is connected with box coupling, it is provided with power unit and Bearning mechanism in pump case and bearing housing.Present invention assembly is tight, and gapless is reasonable for structure, tight, and methanol charge efficiency is high, has preferable practicability.

Description

A kind of methanol feed pump

technical field

The invention belongs to the technical field of fuel delivery equipment and relates to a methanol feed pump.

Background technique

In recent years, with the development of the economy, the energy problem has become a worldwide problem. The energy problem is mainly reflected in the petroleum problem, and methanol, as a new energy source, is a good substitute for petroleum. Among the various pumps for transporting methanol, the centrifugal pump transports a large amount of liquid, the liquid discharge is uniform without pulse phenomenon, and the pump can be made of corrosion-resistant materials, which is suitable for transporting corrosive solutions. Due to the toxicity and strong corrosiveness of methanol, the sealing ring of the mechanical seal of the conventional centrifugal pump and the sealing ring of the pump body, the impeller, and the pump cover will be dissolved soon after encountering methanol, so it is necessary to use corrosion-resistant, sealing Good centrifugal pump for delivery

Contents of the invention

The object of the present invention is to provide a methanol feed pump, which improves the sealing performance of the methanol feed pump.

The technical scheme adopted in the present invention is that a methanol feeding pump includes a bearing box, the bearing box is connected with a pump bracket, one end of the bearing box is provided with a pump front cover, and a pump middle cover is provided between the pump front cover and the bearing box, The middle cover of the pump is respectively connected with the pump front cover and the bearing box by screws. The pump middle cover is connected with the pump casing by bolts. The pump casing is in contact with the pump front cover. In the casing, the other end of the main shaft is connected to one end of the driven shaft, and the other end of the driven shaft is keyed to a sleeve coupling, and a power unit and a bearing mechanism are arranged between the pump casing and the bearing box.

The present invention is also characterized in that,

The pump casing is respectively provided with an inlet and an outlet. The axes of the inlet and the outlet are vertical. The structure is connected, and a pump casing gasket is arranged between the pump casing and the pump front cover.

The power unit includes an impeller connected to one end of the main shaft, and the end of the main shaft connected to the impeller is located in the pump casing, and the impeller is fixed on the main shaft through the matching set screw and the impeller lock nut, and a front bearing is arranged between the pump casing and the impeller. Grinding ring, the front wear ring is fixed on the inner wall of the pump casing by screws, the rear wear ring is arranged between the pump front cover and the impeller, the rear wear ring is fixed on the inner wall of the pump front cover by screws, and the main shaft corresponds to the position of the pump front cover A first plug is set at the position of the first plug, and a sealing assembly is fitted on the outer side of the main shaft corresponding to the position of the first plug. One end of the sealing assembly is attached to the impeller, and the other end of the sealing assembly is provided with a gland. The outer side of the sealing assembly is attached to the surface of the pump front cover. The surface of the pump front cover and the outer side of the seal assembly are in the gland, and an O-ring is arranged between the end surface of the pump front cover in the gland and the gland;

It also includes a through pipe and a pipe joint welding assembly respectively arranged on the bearing box. One end of the through pipe is located outside the bearing box, the other end of the through pipe is located inside the bearing box and is opposite to the position of the gland, and one end of the pipe joint welding assembly is located outside the bearing box. The other end of the pipe joint welding assembly is located in the gland.

The sealing assembly includes a shaft sleeve and a gasket fitted outside the main shaft. The gasket is located between the main shaft and the shaft sleeve. One end of the shaft sleeve is attached to the impeller. A mechanical seal is arranged outside the shaft sleeve. The shaft sleeve is made of 0Cr18Ni12Mo2 stainless steel.

The pipe joint welding assembly includes a straight pipe with one end outside the bearing box. The end of the straight pipe outside the bearing box is connected with a pipe joint nozzle. A pipe joint is welded outside the connection between the straight pipe and the pipe joint nozzle. The other end of the straight pipe is located in the gland. .

The connection between the impeller and the main shaft is a key connection.

The bearing mechanism includes an oil deflector ring fitted on the main shaft. The oil deflector ring is located on the side of the sealing assembly where the gland is provided. The second bearing cap, the first bearing cap and the second bearing cap are connected to the bearing box by bolts, the surface of the second bearing cap is provided with an oil seal, and the first bearing cap and the second bearing cap are provided with a bearing cap between the bearing box As for the paper pad, the main shaft is provided with a first bearing, and the connecting end of the driven shaft and the main shaft is provided with a second bearing, and the first bearing and the second bearing are respectively located on the sides of the first bearing cover and the second bearing cover close to each other, The end face of the first bearing close to the first bearing cover is provided with an adjustment ring, the corresponding position of the bearing box and the first bearing is provided with an eye screw bolt, an oil level gauge is fixed in the bearing box, and a second plug is set in the oil level gauge The oil level gauge is located between the first bearing and the second bearing, and a breather pipe is arranged on the bearing box. The breather pipe is located directly above the oil level gauge, and the breather pipe makes the inside of the bearing box and the oil level gauge communicate with the atmosphere.

A sign is fixed on the bearing box by screws.

The sleeve coupling includes a first coupling that is keyed to the driven shaft. The first coupling is connected to one end of the sleeve through a pin. An elastic ring is arranged between the pin and the first coupling. The sleeve The other end surface of the cylinder is connected with a second shaft coupling by screws.

The pump front cover, pump casing and impeller are all made of ZGCr18Ni12Mo2Ti, and the main shaft, impeller lock nut, front wear ring, rear wear ring and gland are all made of 0Cr18Ni12Mo2 stainless steel.

The beneficial effects of the present invention are that all parts of the methanol feeding pump in the present invention that are in contact with methanol or indirect contact are made of corrosion-resistant materials with good performance, and the cost is low, thereby prolonging the service life of the pump and improving the working efficiency. Efficiency: The components of the invention are closely assembled without gaps, and the structure is reasonable and compact; the feeding efficiency of methanol is high, and it has good practicability.

Description of drawings

Fig. 1 is the structural representation of a kind of methanol feeding pump of the present invention;

Fig. 2 is the end face view of the impeller in a kind of methanol feeding pump of the present invention;

Fig. 3 is a structural schematic diagram of a sealing assembly in a methanol feed pump according to the present invention.

In the figure, 1. Bearing box, 2. Pump bracket, 3. Pump front cover, 4. Pump middle cover, 5. Pump casing, 6. Main shaft, 7. Driven shaft, 8. Inlet, 9. Outlet, 10. Balance pipe, 11. Pump casing gasket, 12. Impeller, 13. Set screw, 14. Impeller lock nut, 15. Front wear ring, 16. Rear wear ring, 17. First plug, 18. Gland, 19. Through pipe, 20. Pipe joint welding assembly, 21. Shaft sleeve, 22. Gasket, 23. Mechanical seal, 24. Straight pipe, 25. Pipe joint nozzle, 26. Pipe joint, 27. Oil retainer Ring, 28. First bearing cap, 29. Second bearing cap, 30. Oil seal, 31. Bearing cap paper pad, 32. First bearing, 33. Second bearing, 34. Adjusting ring, 35. Eye screw bolt , 36. Oil level gauge, 37. Second plug, 38. Breather pipe, 39. Sign, 40. First coupling, 41. Sleeve, 42. Elastic ring, 43. Second coupling, 44 .O-rings.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

A methanol feeding pump of the present invention, as shown in Figure 1, includes a bearing box 1, a sign 39 is fixed on the bearing box 1 by screws, the bearing box 1 is connected with a pump bracket 2, and one end of the bearing box 1 is provided with a pump front cover 3 There is a pump middle cover 4 between the pump front cover 3 and the bearing box 1, the pump middle cover 4 is respectively connected with the pump front cover 3 and the bearing box 1 through screws, the pump middle cover 4 is connected with the pump casing 5 through bolts, the pump The shell 5 is in contact with the pump front cover 3, the bearing box 1 is provided with a main shaft 6, one end of the main shaft 6 passes through the pump front cover 3 and is located in the pump housing 5, the other end of the main shaft 6 is connected to one end of the driven shaft 7, and the other end of the driven shaft 7 A sleeve coupling 8 is key-connected at one end, and a power unit and a bearing mechanism are arranged in the pump casing 5 and the bearing box 1 .

The pump casing 5 is respectively provided with an inlet 8 and an outlet 9, the axes of the inlet 8 and the outlet 9 are vertical, the inlet 8 and the main shaft 6 are located on the same axis, and the inner walls of the inlet 8 and the outlet 9 are provided with threads, and the pump casing 5 is provided with a balance pipe 10, and the balance pipe 10 communicates with the hollow structure inside the pump casing 5, and a pump casing gasket 11 is arranged between the pump casing 5 and the pump front cover 3.

The power unit includes an impeller 12 keyed to one end of the main shaft 6. The end view of the impeller 12 is shown in FIG. The impeller lock nut 14 is fixed on the main shaft 6, and the front wear ring 15 is arranged between the pump casing 5 and the impeller 12, and the front wear ring 15 is fixed on the inner wall of the pump casing 5 by screws, and between the pump front cover 3 and the impeller 12 A rear wear-resistant ring 16 is provided, and the rear wear-resistant ring 16 is fixed on the inner wall of the pump front cover 3 by screws, and a first plug 17 is arranged on the main shaft 6 corresponding to the position of the pump front cover 3, and the outer side of the main shaft 6 is connected to the first plug. The position corresponding to position 17 is fitted with a sealing assembly, one end of the sealing assembly is attached to the impeller 12, the other end of the sealing assembly is provided with a gland 18, the outside of the sealing assembly is attached to the surface of the pump front cover 3, and the surface of the pump front cover 3 is in contact with the sealing assembly One end of the outside joint is located in the gland 18, and an O-ring 44 is arranged between one end face of the pump front cover 3 in the gland 18 and the gland 18;

It also includes a through pipe 19 and a pipe joint welding assembly 20 respectively arranged on the bearing box 1. One end of the through pipe 19 is located outside the bearing box 1, and the other end of the through pipe 19 is located inside the bearing box 1 and is opposite to the position of the gland 18. The pipe joint One end of the welding assembly 20 is located outside the bearing housing 1 , and the other end of the pipe joint welding assembly 20 is located in the gland 18 .

As shown in Figure 3, the seal assembly includes a shaft sleeve 21 and a gasket 22 that fit outside the main shaft 6, the gasket 22 is located between the main shaft 6 and the shaft sleeve 21, one end of the shaft sleeve 21 fits the impeller 12, and the shaft sleeve 21 is provided with mechanical seal 23, and shaft sleeve 21 adopts 0Cr18Ni12Mo2 stainless steel.

The pipe joint welding assembly 20 includes a straight pipe 24 with one end located outside the bearing box 1. One end of the straight pipe 24 located outside the bearing box 1 is connected with a pipe joint nozzle 25, and a pipe joint 26 is welded outside the connection between the straight pipe 24 and the pipe joint nozzle 25. , the other end of the straight pipe 24 is located in the gland 18 .

The bearing mechanism includes an oil deflector ring 27 fitted on the main shaft 6. The oil deflector ring 27 is located on the side of the sealing assembly provided with the gland 18. The side of the oil deflector ring 27 away from the sealing assembly is provided with a first bearing cover 28. The bearing The other end of case 1 is provided with second bearing cover 29, and first bearing cover 28 and second bearing cover 29 are all connected with bearing case 1 by bolt, and the surface of second bearing cover 29 is provided with oil seal 30, first bearing cover 28 and A bearing cover paper pad 31 is provided between the second bearing cover 29 and the bearing box 1, a first bearing 32 is provided on the main shaft 6, a second bearing 33 is provided at the connecting end of the driven shaft 7 and the main shaft 6, and the first The bearing 32 and the second bearing 33 are respectively located on the side of the first bearing cover 28 and the second bearing cover 29 close to each other. The end face of the first bearing 32 close to the first bearing cover 28 is provided with an adjustment ring 34. The corresponding position of a bearing 32 is provided with an eye screw bolt 35, an oil level gauge 36 is fixed in the bearing box 1, and a second plug 37 is arranged in the oil level gauge 36, and the oil level gauge 36 is located between the first bearing 32 and the second Between the bearings 33 , the bearing box 1 is provided with a vent pipe 38 communicating with the inside of the bearing case 1 , and the vent pipe 38 is located directly above the oil level gauge 37 .

The sleeve coupling 8 includes a first coupling 40 keyed to the driven shaft 7. The first coupling 40 is connected to one end surface of a sleeve 41 through a pin. Between the pin and the first coupling 40 An elastic ring 42 is provided, and the other end surface of the sleeve 41 is connected with a second coupling 43 by screws.

The effect of main parts in a kind of methanol feeding pump of the present invention is specifically as follows:

The balance pipe 10 mainly balances the axial thrust of the methanol feeding pump of the present invention, reduces the axial movement of the rotor, and avoids friction between the impeller 12 and the pump casing 5;

The matching set screw 13 and impeller lock nut 14 have the functions of fastening and preventing loosening of the impeller 12, and at the same time have the function of supplementing the flow channel;

The shaft sleeve 21 reduces the wear caused by the rotation of the main shaft 6;

Mechanical seal 23 prevents methanol from leaking;

The effect of the oil seal 30 is to prevent oil leakage;

Bearing cover paper pad 31 is used to prevent external foreign matter from entering the bearing;

The adjustment ring 34 is used to adjust the assembly clearance;

The effect of eye screw bolt 35 can be used for lifting a kind of methanol feeding pump of the present invention;

The vent pipe 38 is used to keep the inside of the bearing housing 1 in a state of communicating with the oil level gauge 36 in the atmosphere.

The bearing housing 1, the first bearing cover 28 and the second bearing cover 29 are all made of HT20-40 material, which can resist permanent deformation and damage;

The pump front cover 3, pump casing 5 and impeller 12 are in direct contact with methanol, so they are made of ZGCr18Ni12Mo2Ti material, which has good corrosion resistance to reducing media and various organic acids, alkalis and salts.

The pump middle cover 4 is made of QT40-17 material, which has the advantages of high strength, high toughness and good wear resistance;

Main shaft 6, impeller lock nut 14, front wear ring 15, rear wear ring 16, gland 18, bushing 21 and all are made of 0Cr18Ni12Mo2 stainless steel, which has good resistance to intergranular corrosion;

Adjusting ring 34, first plug 17, bolts and screws are all made of 2Cr13 martensitic stainless steel, which can resist elastic deformation, plastic deformation or damage, and has certain corrosion resistance;

The O-ring 44 is made of polytetrafluoroethylene, which has low friction and is resistant to methanol corrosion.

The working medium of the methanol feeding pump of the present invention is methanol; the inlet temperature is 25°C; the inlet pressure is 3.8kg/cm ² ; the outlet pressure is 4.8kg/cm ² ; the rotational speed is ^2940r /min; h; power is 7.1KW.

The working process of a kind of methanol feeding pump of the present invention is specifically as follows:

Connect the sleeve coupling 8 with the motor, so that the sleeve coupling 8 drives the driven shaft 7 to rotate, and further passes through the bearing box 1, and the main shaft 6 is rotated through the fixing effect of the first bearing 32 and the second bearing 33, The kinetic energy is transmitted to the impeller 12 through the rotation of the main shaft 6, thereby driving the impeller 12 to rotate and work, and the methanol liquid between the impeller 12 must also rotate accordingly. Under the action of centrifugal force, the methanol liquid is thrown from the center of the impeller 12 to the outer edge and gains energy, leaving the outer edge of the impeller and entering the pump casing 5 at a high speed. In the pump casing 5, the methanol liquid decelerates due to the gradual expansion of the flow channel, and converts part of the kinetic energy into static pressure energy, and finally flows into the discharge pipe from the outlet 9 at a relatively high pressure. When the methanol liquid flows from the center of the impeller 12 to the outer edge, a certain vacuum is formed in the center of the impeller 12. Since the pressure above the liquid level of the storage tank is greater than the pressure at the liquid inlet 8, the liquid is continuously pressed into the impeller 12. Therefore, as long as The impeller 12 is constantly rotating, and the liquid is continuously sucked and discharged.

Through the above method, the various parts of the methanol feed pump in the present invention that are in contact with methanol or indirectly use corrosion-resistant materials with good performance and low cost, thereby prolonging the service life of the pump and improving work efficiency; The components are invented, the parts are tightly assembled, there is no gap, the structure is reasonable and compact; the feeding efficiency of methanol is high, and it has good practicability.

Claims (10)

1. a kind of methanol feed pump, which is characterized in that including bearing housing (1), the bearing housing (1) is connected with pump holder (2), institute It states bearing housing (1) one end and is provided with pump protecgulum (3), pump middle cover (4) is provided between the pump protecgulum (3) and bearing housing (1), The pump middle cover (4) is connect with pump protecgulum (3) and bearing housing (1) by screw respectively, and the pump middle cover (4) passes through spiral shell It tethers and is connected to pump case (5), the pump case (5) contacts with pump protecgulum (3), and main shaft (6) is provided in the bearing housing (1), described Main shaft (6) one end passes through pump protecgulum (3) to be located in pump case (5), and main shaft (6) other end is connected with driven shaft (7) one end, it is described from Moving axis (7) other end key connection have box coupling (8), be provided in the pump case (5) and bearing housing (1) power unit with Bearning mechanism.

2. a kind of methanol feed pump according to claim 1, which is characterized in that the pump case (5) is respectively arranged with import (8) and (9) being exported, the import (8) and the axis for exporting (9) are vertical, and the import (8) is located at same axis with main shaft (6), And the import (8) and outlet (9) inner wall are both provided with screw thread, and balance pipe (10), and balance pipe are provided on the pump case (5) (10) hollow structure internal with pump case (5) is connected to, and pump case gasket (11) is provided between the pump case (5) and pump protecgulum (3).

3. a kind of methanol feed pump according to claim 1, which is characterized in that the power unit includes and main shaft (6) The impeller (12) of one end connection, described main shaft (6) one end for being connected with impeller (12) is located in pump case (5), and the impeller (12) it is fixed on main shaft (6) by matched holding screw (13) and impeller locking nut (14), the pump case (5) and leaf It is provided with preceding wear ring (15) between wheel (12), the preceding wear ring (15) is fixed by screws in pump case (5) inner wall, the pump Rear wear ring (16) is provided between protecgulum (3) and impeller (12), the rear wear ring (16) is fixed by screws in pump protecgulum (3) inner wall, is provided with the first plug (17) on the main shaft (6) with pump protecgulum (3) position corresponding position, on the outside of the main shaft (6) It is sheathed with seal assembly with the first plug (17) position corresponding position, described seal assembly one end is bonded with impeller (12), described close The sealing assembly other end is provided with gland (18), is bonded with pump protecgulum (3) surface on the outside of the seal assembly, and pump protecgulum (3) table The one end being bonded on the outside of face and seal assembly is located in gland (18), and one end end of the pump protecgulum (3) in gland (18) O-ring (44) is provided between face and gland (18)；

Further include the siphunculus (19) being separately positioned on bearing housing (1) and pipe fitting weld assembly (20), the siphunculus (19) one It is external that end is located at bearing housing (1), siphunculus (19) other end be located at it is inside bearing housing (1) and opposite with gland (18) position, Described pipe fitting weld assembly (20) one end is located at bearing housing (1) outside, and pipe fitting weld assembly (20) other end is located at In gland (18).

4. a kind of methanol feed pump according to claim 3, which is characterized in that the seal assembly includes being linked in main shaft (6) outside axle sleeve (21) and gasket (22), the gasket (22) are located between main shaft (6) and axle sleeve (21), the axle sleeve (21) One end be bonded with impeller (12), be provided with mechanical seal (23) outside the axle sleeve (21), the axle sleeve (21) is 0Cr18Ni12Mo2 stainless steel materials.

5. a kind of methanol feed pump according to claim 3, which is characterized in that the pipe fitting weld assembly (20) includes One end is located at the external straight tube (24) of bearing housing (1), and the straight tube (24), which is located at one end outside bearing housing (1) and is connected with pipe, to be connect Nozzle (25), the straight tube (24) connect with pipe and are welded with pipe fitting (26), straight tube (24) other end on the outside of nozzle (25) junction In gland (18).

6. a kind of methanol feed pump according to claim 3, which is characterized in that the company of the impeller (12) and main shaft (6) It is connected in key connection.

7. a kind of methanol feed pump according to claim 3, which is characterized in that the Bearning mechanism includes being linked in main shaft (6) oil scraper ring (27) on, the oil scraper ring (27) are located at the side that seal assembly is provided with gland (18), the oil scraper ring (27) side far from seal assembly is provided with first bearing lid (28), and the other end of the bearing housing (1) is provided with the second axis Lid (29) is held, the first bearing lid (28) and second bearing lid (29) are connect by bolt with bearing housing (1), and described second Bearing cap (29) surface is provided with oil sealing (30), the first bearing lid (28) and second bearing lid (29) with bearing housing (1) Between be provided with bearing cap paper washer (31), be provided with first bearing (32) on the main shaft (6), on the driven shaft (7) with master The connecting pin of axis (6) is provided with second bearing (33), and the first bearing (32) and second bearing (33) are located at first axle Lid (28) and second bearing lid (29) are held close to mutual side, the first bearing (32) is close to the end of first bearing lid (28) Face is provided with adjustment ring (34), and the corresponding position of first bearing (32) is provided with eye bolt bolt on the bearing housing (1) (35), it is fixed with oil level indicator (36) in the bearing housing (1), the second plug (37) is provided in the oil level indicator (36), it is described Oil level indicator (36) is located between first bearing (32) and second bearing (33), is provided on the bearing housing (1) and bearing housing (1) The snorkel (38) of inside connection, the snorkel (38) is located at right over oil level indicator (37), and the snorkel (38) makes axis It holds case (1) inside and oil level indicator (37) is communicated with air.

8. according to claim 1 or a kind of methanol feed pump of 3 or 5 or 7 any one of them, which is characterized in that the bearing housing (1) label (39) is fixed with by screw on.

9. a kind of methanol feed pump according to claim 1, which is characterized in that the box coupling (8) include with from The first shaft coupling (40) of moving axis (7) key connection, first shaft coupling (40) are connected with sleeve (41) end face by pin, Elastic ring (42) is provided between the pin and the first shaft coupling (40), sleeve (41) other end is connected by screw There is the second shaft coupling (43).

10. a kind of methanol feed pump according to claim 3, which is characterized in that the pump protecgulum (3), pump case (5) and leaf The material of wheel (12) is ZGCr18Ni12Mo2Ti, main shaft (6), impeller locking nut (14), preceding wear ring (15), rear wear-resisting Ring (16) and gland (18) are 0Cr18Ni12Mo2 stainless steel materials.