CN112814990A

CN112814990A - High-strength crankshaft for three-cylinder high-pressure plunger pump

Info

Publication number: CN112814990A
Application number: CN202110146615.5A
Authority: CN
Inventors: 周江明; 宋湘文
Original assignee: Shanghai Juliyuan Fluid Technology Co ltd
Current assignee: Shanghai Juliyuan Fluid Technology Co ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2021-05-18

Abstract

The invention relates to a high-strength crankshaft for a three-cylinder high-pressure plunger pump, which relates to the technical field of high-pressure plunger pumps and comprises a crankshaft body, wherein an output end and an input end are respectively arranged at two ends of the crankshaft body, the output end is sequentially connected with a first connecting rod neck, a first crank arm, a second connecting rod neck, a second crank arm and a third connecting rod neck towards the direction of the input end, and the axial leads of the first connecting rod neck, the second connecting rod neck and the third connecting rod neck are arranged in a 120-degree staggered manner; the input end is connected with a thrust main journal. The invention has the advantages of compact mechanism and complete function.

Description

High-strength crankshaft for three-cylinder high-pressure plunger pump

Technical Field

The invention relates to the technical field of high-pressure plunger pumps, in particular to a high-strength crankshaft for a three-cylinder high-pressure plunger pump.

Background

The existing crankshaft for the high-pressure plunger pump still continues the design route of the crankshaft of the traditional internal combustion engine, and the existing crankshaft for the high-pressure plunger pump as shown in fig. 1 is mainly formed by assembling five main parts, namely a main journal, a thrust main journal, a connecting rod journal, a balance block, a crank arm for connecting the main journal, the thrust main journal and the connecting rod journal and the like.

The power input and output of the three-cylinder high-pressure plunger pump crankshaft is actually different from the crankshaft of the internal combustion engine, the traditional crankshaft of the internal combustion engine converts the gas power transmitted by a piston and a connecting rod assembly into torque and transmits the torque to the crankshaft, so the traditional crankshaft is a passive power receiving side, the three-cylinder high-pressure plunger pump drives the crankshaft to rotate through a driving device or drives the crankshaft to rotate through a transmission shaft and a gear assembly, and the torque is actively output to a bearing bush, a connecting rod and a crosshead which are connected to the crankshaft, and three groups of crank throws of the crankshaft are distributed in a 120-degree staggered manner to drive three plungers to do alternate reciprocating linear motion, so the functions of discharging pressure and transmitting flow of the high-pressure plunger pump are realized.

Secondly, the crank arm of the crankshaft for the existing high-pressure plunger pump is designed to be thin, the difference of the torque input and output directions of the crankshaft for the pump, which are different from the crankshaft of the internal combustion engine, is not considered, and the surface quenching heat treatment process of the traditional crankshaft of the internal combustion engine has to be used to prevent the risk of crankshaft fracture failure, which undoubtedly increases the complex heat treatment process of the crankshaft;

further, since the high-pressure plunger pump needs to be constantly operated during use, the crankshaft for the high-pressure plunger pump receives a high-frequency reciprocating inertial force of 7 × 24 hours, a rotational inertial force, a hydraulic reaction force of a fluid to be conveyed, and a resultant moment generated by these forces, and is twisted and bent. Therefore, the design, material selection and processing of the crankshaft for the high-pressure plunger pump are inappropriate, and the crankshaft is easy to break and the journal is easy to wear, so that the crankshaft fails.

The combined action of the above aspects leads to the high cost of the existing single crankshaft product of the high-pressure plunger pump, so the invention discloses the crankshaft for the high-pressure plunger pump, which has the advantages of simple design, compact mechanism, complete function and convenient disassembly, assembly and maintenance, and is a difficult problem to be solved urgently.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a high-strength crankshaft for a three-cylinder high-pressure plunger pump, which has the advantages of compact mechanism and complete function.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides a high strength bent axle for three jar high pressure plunger pumps, includes the bent axle body, its characterized in that: the two ends of the crankshaft body are respectively provided with an output end and an input end, the output end is sequentially connected with a first connecting rod neck, a first crank arm, a second connecting rod neck, a second crank arm and a third connecting rod neck towards the direction of the input end, and the axes of the first connecting rod neck, the second connecting rod neck and the third connecting rod neck are arranged in a 120-degree staggered mode; the input end is connected with a thrust main journal.

By adopting the technical scheme, only one thrust main journal is reserved and moved out of the space between the connecting rod journals, so that the axial size of the crankcase shell can be reduced, the size of the integral power end is smaller, the appearance is more compact, and great convenience is brought to the installation and the transportation of the crankcase; simultaneously through retrenching and optimizing the structure of crank arm for two adjacent connecting rod necks are through the crank arm direct linking after optimizing, thereby reach the purpose that increases whole bent axle mechanical strength, have satisfied the requirement of the harsh operating mode of high-pressure plunger pump.

The invention is further configured to: and the two arm openings of the first crank arm are respectively consistent with the radial sizes of the first connecting rod neck and the second connecting rod neck.

The invention is further configured to: the radial cross-sectional area of the first crank arm is equal to the radial cross-sectional areas of the first and second connecting journals.

The invention is further configured to: and the two arm openings of the second crank arm are consistent with the radial sizes of the second connecting rod neck and the third connecting rod neck.

Through adopting above-mentioned technical scheme, retrench and optimized the structure of crank arm for two adjacent connecting rod necks are directly continuous through the crank arm after optimizing, and according to the power initiative transport principle of crankshaft for the pump, increase the sectional area of crank arm, thereby reach the purpose that increases whole crankshaft mechanical strength, satisfied the requirement of the harsh operating mode of high-pressure plunger pump.

The invention is further configured to: the axis of the first connecting rod neck is consistent with the axis of the crankshaft body.

The invention is further configured to: the relative distance between the center axis of the first and second journals is e1, the relative distance between the center axis of the second and third journals is e2, and e1 is equal to e 2.

The invention is further configured to: the central axis of the third connecting rod neck is higher than the central axis of the crankshaft body in the vertical direction.

By adopting the technical scheme, the increased axial ratio of the connecting rod neck relative to the main journal is used for improving the rotational inertia of the crankshaft so as to adapt to the requirement of the driving torque output working condition of the crankshaft for the pump.

The invention is further configured to: the input end is cylindrical, and the thrust main shaft is sleeved on the input end.

The invention is further configured to: first connecting rod neck, first crank arm, second connecting rod neck, second crank arm, third connecting rod neck and bent axle body integrated into one piece.

By adopting the technical scheme, the surface quenching heat treatment process of the crank arm by the traditional crankshaft is omitted, the cost is further reduced, and the crank arm is convenient to disassemble, assemble and maintain.

In conclusion, the beneficial technical effects of the invention are as follows:

1. the thrust main journal, the three connecting rod journals and the two crank arms are mutually connected, so that the axial size of the crankcase shell can be reduced, the size of the integral power end is smaller, the structure is more compact, and great convenience is brought to the installation and the transportation of the crankcase;

2. the optimized crank arm structure can be regarded as combining the functions of the traditional thrust journal and the balance block, so that the connecting rod journals can be directly connected through the crank arms, the radial ratio of the connecting rod journals to the main journal is improved, and the purpose of improving the rotational inertia of the crankshaft is achieved;

3. the crank arm structure is optimized, and the sectional area of the crank arm is increased, so that the purpose of increasing the mechanical strength of the whole crankshaft is achieved, and the requirement of the high-pressure plunger pump on severe working conditions is met;

4. after the strength of the integral structure is improved, the surface quenching heat treatment process of the crank arm by the traditional crank shaft can be omitted, and the cost is further reduced.

Drawings

FIG. 1 is a schematic view of an overall structure of a crankshaft in the related art;

FIG. 2 is a schematic view of the overall structure of the crankshaft;

fig. 3 is a left side view of the entire structure in the present embodiment.

In the figure, 1, a crankshaft body; 2. an output end; 3. an input end; 4. a first connecting rod neck; 5. a first crank arm; 6. a second connecting rod neck; 7. a second crank arm; 8. a third connecting rod neck; 9. and a thrust main journal.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 2, the high-strength crankshaft for the three-cylinder high-pressure plunger pump disclosed by the invention comprises a crankshaft body 1, wherein an output end 2 and an input end 3 are respectively arranged at two ends of the crankshaft body 1, the output end 2 is sequentially connected with a first connecting rod neck 4, a first crank arm 5, a second connecting rod neck 6, a second crank arm 7 and a third connecting rod neck 8 towards the input end 3, the axial lines of the first connecting rod neck 4, the second connecting rod neck 6 and the third connecting rod neck 8 are arranged in a 120-degree staggered mode, and the first connecting rod neck 4, the first crank arm 5, the second connecting rod neck 6, the second crank arm 7, the third connecting rod neck 8 and the crankshaft body 1 are integrally formed.

Referring to fig. 2, a thrust main journal 9 is connected to the input end 3. The output end 3 is cylindrical, and the inner diameter of the thrust main journal 9 is about larger than that of the output end 3, so that the thrust main journal 9 is sleeved on the output end 3 and is convenient to mount and dismount. In other embodiments, the thrust main journal 9 and the input end 3 may be mounted in other connection manners, such as a snap connection, a screw connection, and the like, which are described herein.

Referring to fig. 2 and 3, the first connecting rod journal 4 coincides with the central axis of the crankshaft body 1; the central axis of the third connecting neck 8 is higher than the central axis of the crankshaft body 1 in the vertical direction of the third connecting neck 8, and the central axis of the second connecting neck 6 is higher than the central axis of the crankshaft body 1 in the vertical direction of the third connecting neck 8; meanwhile, the eccentricity between the central axis of the first journal 4 and the central axis of the second journal 6 is e1, the eccentricity between the central axis of the second journal 6 and the central axis of the third journal 8 is e2, and e1 is equal to e 2. The increased shaft diameter ratio of the connecting rod neck relative to the crankshaft body 1 is used for improving the rotational inertia of the crankshaft, so that the requirement of the driving torque output working condition of the crankshaft for a pump is met, the overall structural strength of the crankshaft is improved, the surface quenching heat treatment process of the crank arm by the traditional crankshaft can be omitted, and the cost is further reduced.

Referring to fig. 2 and 3, in order to further increase the inertia moment of the crankshaft, the two openings of the first crank arm 5 in the present embodiment correspond to the radial sizes of the first and second journals 4, 6. The radial cross-sectional area of the first crank arm 5 is approximately equal to the area of the first and second connecting journals 4, 6. The two openings of the second crank arm 7 correspond to the radial dimensions of the second and third journals 6, 8. Thereby the crank arm structure of optimizing merges traditional thrust journal and balancing piece function, can directly link to each other through the crank arm between the connecting rod neck like this, promotes the radial ratio of connecting rod neck and main journal to reach the inertia's of promotion bent axle purpose, and inertia's promotion not only can improve pumping pressure and flow, also can reduce pressure fluctuation and noise, has strengthened the whole reliability of the operation of high-pressure plunger pump, thereby promote the environmental friendliness in the high-pressure plunger pump use.

In the embodiment, the high-strength crankshaft for the three-cylinder high-pressure plunger pump only retains one thrust main journal 9, and the thrust main journal 9 is moved out of the space between the connecting rod journals, so that the axial size of the crankcase shell can be reduced, the size of the integral power end is smaller, the appearance is more compact, and great convenience is brought to the installation and transportation of the crankcase; simultaneously through retrenching and optimizing the structure of crank arm for two adjacent connecting rod necks are through the crank arm direct linking after optimizing, thereby reach the purpose that increases whole bent axle mechanical strength, have satisfied the requirement of the harsh operating mode of high-pressure plunger pump.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a high strength bent axle for three jar high pressure plunger pumps, includes bent axle body (1), its characterized in that: the crankshaft comprises a crankshaft body (1), wherein an output end (2) and an input end (3) are respectively arranged at two ends of the crankshaft body (1), the output end (2) is sequentially connected with a first connecting rod neck (4), a first crank arm (5), a second connecting rod neck (6), a second crank arm (7) and a third connecting rod neck (8) in the direction of the input end (3), and the axes of the first connecting rod neck (4), the second connecting rod neck (6) and the third connecting rod neck (8) are arranged in a 120-degree staggered mode; the input end (3) is connected with a thrust main journal (9).

2. The high-strength crankshaft for the three-cylinder high-pressure plunger pump according to claim 1, wherein: the two openings of the first crank arm (5) are respectively consistent with the radial sizes of the first connecting rod neck (4) and the second connecting rod neck (6).

3. The high-strength crankshaft for the three-cylinder high-pressure plunger pump according to claim 2, wherein: the radial cross-sectional area of the first crank arm (5) is equal to the radial cross-sectional areas of the first connecting rod neck (4) and the second connecting rod neck (6).

4. The high-strength crankshaft for the three-cylinder high-pressure plunger pump according to claim 2, wherein: and the two arm openings of the second crank arm (7) are consistent with the radial sizes of the second connecting rod neck (6) and the third connecting rod neck (8).

5. The high-strength crankshaft for the three-cylinder high-pressure plunger pump according to claim 1, wherein: the axis of the first connecting rod neck (4) is consistent with the axis of the crankshaft body (1).

6. The high-strength crankshaft for the three-cylinder high-pressure plunger pump according to claim 5, wherein: the relative distance between the central axis of the first connecting rod neck (4) and the central axis of the second connecting rod neck (6) is e1, the relative distance between the central axis of the second connecting rod neck (6) and the central axis of the third connecting rod neck (8) is e2, and e1 is equal to e 2.

7. The high-strength crankshaft for the three-cylinder high-pressure plunger pump according to claim 6, wherein: the central axis of the third connecting rod neck (8) is higher than the central axis of the crankshaft body (1) in the vertical direction.

8. The high-strength crankshaft for the three-cylinder high-pressure plunger pump according to claim 1, wherein: the input end (3) is cylindrical, and the thrust main journal (9) is sleeved on the input end (3).

9. The high-strength crankshaft for the three-cylinder high-pressure plunger pump according to claim 1, wherein: the crank shaft comprises a first connecting rod neck (4), a first crank arm (5), a second connecting rod neck (6), a second crank arm (7), a third connecting rod neck (8) and a crankshaft body (1) which are integrally formed.