CN216950328U - Novel petroleum relay pump - Google Patents

Abstract

The application discloses novel oil relay pump, which comprises a pump body, the oil inlet, the oil-out, oil inlet department is provided with the feed valve, oil-out department is provided with the bleeder valve, the symmetry is provided with at least a set of disjunctor piston room in the pump body, every disjunctor piston room is equipped with 2 relatively and carries the piston, oil inlet feed valve and oil-out bleeder valve and two carry the cavity that the piston encloses at the maximum stroke of piston room reverse motion together to constitute and carry the chamber, be connected with synchronous drive mechanism on the pump body, including transmission chamber and drive storehouse, be provided with synchronous component in the transmission chamber, be provided with drive assembly in the drive storehouse, synchronous component is connected with drive assembly. The two conveying pistons are arranged oppositely, so that mechanical vibration generated during operation is reduced, the operation is stable, the advantages of a piston pump are inherited, the defects of the conventional mixed conveying pump are overcome, the conveying requirements of the high-speed, high-efficiency, long-time and high-capacity relay pump of an oil field and an oil well can be met, the conventional mixed conveying relay pump can be completely replaced, and the market prospect is wide.

Description

Novel petroleum relay pump

Technical Field

The utility model relates to the technical field of petrochemical equipment.

Background

In oil production, the artesian well is few, and most wells are lifted by corresponding machines. Throughout the world oil field and oil well, the proportion of a 'kowtow machine' commonly called a beam pumping unit is all the same, and the most core piston pump in the beam pumping unit plays a role in lifting the underground petroleum to a well head. The oil well produced contains mineral, paraffin, hydrate, corrosive or toxic materials, such as hydrogen sulfide, soluble acids, alkalis, salts, etc. besides conventional crude oil, water and natural gas, and may also contain solid particles, such as sand, scrap iron in pipelines, welding slag, etc., and the components are quite complex.

In recent years, the oil-gas mixed transportation technology is widely favored in oil exploitation, better solves the centralized transportation of remote oil well products, saves energy and improves efficiency of oil fields, protects the environment and is very beneficial to effectively recovering oil and gas resources. The multiphase medium is difficult to adapt to the existing piston pump, screw pump, diaphragm pump, eccentric rotary pump and the like, has low efficiency, is easy to cause sealing failure and bearing damage due to corrosion and abrasion of working conditions, has low service life, cannot meet the requirement of the conventional season inspection period of an oil field, and increases the maintenance and use cost.

The central processing station is usually built in a place where transportation is relatively convenient, and a relay pump is needed to be used as power for conveying an oil-gas mixture pipeline besides a conveying pipeline for conveying a mixture of mediums such as oil, gas, mud, sand, water and the like lifted from a wellhead to the central processing station.

Untreated medium coming out of the well mouth is conveyed by the relay pump, the application conditions of various oil fields and oil wells and the conveyed medium possibly have great difference, and in addition, the oil wells are remote and inhospitable, and the relay pump must be adapted to complex and severe operation conditions. Besides mature manufacturing technology and low price, the wear-resistant and corrosion-resistant steel plate has low requirements on working conditions and environment, and has stable and reliable work, low use and maintenance requirements. After long-term use and screening, the eccentric rotary pump and the spiral rod pump can meet the requirements.

Referring to fig. 1, the core component of the eccentric rotary pump is composed of a fixed disk and a rotor mounted on an eccentric shaft, an inlet and an outlet are both designed on a pump disk, the eccentric shaft drives the rotor to do eccentric motion under the drive of a motor, and a pump cavity formed between the rotor and the inlet and the outlet of the pump disk is continuously changed from large to small. When the volume of the inlet cavity is changed from small to large, the oil-gas mixture in the inlet pipeline is pushed into the pump from the inlet; when the rotor continues to move, the volume of the inlet cavity is reduced from large to small, the volume of the outlet cavity is slowly increased from small to large, the oil-gas mixture in the pump is pushed to the outlet pipeline from the outlet, and the oil-gas mixture which reciprocates to complete the task of relaying pumping is obtained.

The motor-pumped well is mostly in the barren field and is mostly unattended in oil and gas exploitation, the motor-pumped well is continuously started for day and night without stopping, maintenance and inspection in seasons are adopted, the motor-pumped well oil exploitation and conveying supporting equipment must be stable and reliable, and the service life is the lowest and can meet the requirements of the season inspection. Otherwise, not only the equipment and personnel cost is increased, but also the oil production of the motor-pumped well is influenced.

Although the eccentric rotary pump has strong adaptability, large pumping and discharging amount and low use and maintenance cost in oil exploitation, the eccentric rotary pump has large operation vibration, quick product failure and short service life which is not enough to be matched with the season inspection period of an oil well. Through statistics on the use condition of the MoWake pump in the current relay conveying of a certain oil field, faults such as shaft deformation and eccentric wear, sealing damage, easy damage to bearings and the like often occur, the service life is about half a month (less than 1000 hours) which is the shortest, generally 2 months to 2 months (1400-1800 hours), and rarely 3 months (about 2000 hours), and the oil field is very headache, so that a reliable product with longer service life is urgently needed.

The eccentric arrangement and the eccentric operation of the eccentric rotary pump rotor have the defects that strong mechanical vibration cannot be avoided in practical application, the increase of the operation speed is limited, faults such as sealing failure and damage are prone to occurring, and the defects are prone to scaling.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: in order to solve the problems of high mechanical vibration, limited operation rate, easy sealing failure, damage and other faults of an eccentric rotary pump in the prior art, the novel petroleum relay pump is disclosed, the application adopts two opposite conveying pistons on the basis of a piston pump to offset and reduce the mechanical vibration generated by the movement of a crankshaft, the work is stable, safe and reliable, the advantages of the piston pump are inherited, the defects of the existing mixed conveying pump are overcome, the requirements of high-speed, high-efficiency, long-time and high-capacity relay pumping of an oil well in an oil field can be met, the existing other mixed conveying relay pumps can be completely replaced, and the market prospect is wide.

The utility model specifically adopts the following technical scheme for realizing the purpose:

a novel petroleum relay pump comprises a pump body, an oil inlet and an oil outlet, wherein a feed valve is arranged at the oil inlet, a discharge valve is arranged at the oil outlet, at least one group of connected piston chambers are symmetrically arranged in the pump body, 2 conveying pistons are oppositely assembled in each group of connected piston chambers, the feed valve at the oil inlet end and the discharge valve at the oil outlet end and a cavity formed by the two conveying pistons in the maximum reverse movement stroke of the connected piston chambers form a conveying cavity together, the pump body is connected with a synchronous transmission mechanism for driving the conveying pistons to synchronously rotate, the synchronous transmission mechanism comprises a transmission chamber and a driving chamber which are arranged at two sides of the pump body, the driving chamber is just opposite to the connected piston chambers, a synchronous component is arranged in the transmission chamber, a driving component for driving the conveying pistons is arranged in the driving chamber, and the synchronous component is connected with the driving component, the synchronous transmission mechanism is driven by a motor.

Through the scheme, at least one group of connected piston chambers are symmetrically arranged, each connected piston chamber is provided with 2 conveying pistons, after an oil inlet and an oil outlet of a pump body are connected with corresponding pipelines of an oil well, and when a power supply of a pump power source motor is switched on and started, a pump starts to perform a relay pumping task of a mixture of oil, gas, sand and the like pumped by the oil well, a synchronous transmission mechanism in a transmission chamber is driven by the motor to rotate, a driving assembly in a driving bin is driven to operate, the conveying pistons are driven to simultaneously start, the conveying pistons synchronously rotate, the pump performs suction and discharge motion in the connected piston chambers in a reciprocating mode through the conveying pistons under the driving of the motor, uninterrupted relay pumping is performed, specifically, the conveying pistons are driven by the driving assembly to move towards one side away from each other, at the moment, a feeding valve is opened, a discharge valve is closed, suction force is formed in a conveying cavity to suck the oil-gas-liquid mixture, the conveying pistons move relatively, the discharge valve is opened at the moment, the feeding valve is closed, materials in the conveying cavity are extruded out along the discharge valve, the conveying task is completed in a circulating mode, the two conveying pistons are arranged oppositely, mechanical vibration generated during operation is reduced, the operation is stable, safe and reliable, the advantages of the piston pump are inherited, the defects of an existing mixed conveying pump are overcome, the requirements of high-speed, high-efficiency, long-time and high-capacity relay pumping of an oil field and an oil well can be met, other existing mixed conveying relay pumps can be completely replaced, and the market prospect is wide.

Furthermore, the driving assembly comprises a crankshaft arranged in a driving bin, the crankshaft comprises a crankshaft lower shaft neck, a crankshaft upper shaft neck and a crankshaft connecting rod shaft neck, the crankshaft is symmetrically arranged in the driving bins on two sides of the pump body, a piston connecting rod movably connected with the crankshaft connecting rod shaft neck is arranged on the conveying piston, the crankshaft connecting rod shaft neck is movably connected with one end of the piston connecting rod, the other end of the piston connecting rod is movably connected with the conveying piston, and a bearing seat are arranged between two ends of the crankshaft and the driving bin.

Through the scheme, the synchronous assembly drives the crankshaft to synchronously rotate, so that the piston connecting rod is driven to move through the crankshaft connecting rod shaft neck, the conveying pistons on two sides are driven to synchronously move in opposite directions or in opposite directions, mechanical vibration generated by operation is reduced, and the synchronous assembly is stable in operation, safe and reliable.

Furthermore, the synchronizing assembly comprises 2 main transmission rods arranged between the transmission chambers, first bevel gears are arranged at two ends of each main transmission rod, the first bevel gears are in key connection with the main transmission rods, a crankshaft connected with the driving assembly is arranged at the upper end of the driving bin, second bevel gears meshed with the first bevel gears are arranged at the lower end of lower journals of the crankshaft, the second bevel gears are in key connection with the lower journals of the crankshaft, and bearings are arranged between the transmission chambers and the main transmission rods.

Through the scheme, the motor rotates to drive the main transmission rod to rotate, then the first bevel gear on the main transmission rod rotates to drive the meshed second bevel gear to rotate, then power is synchronously transmitted to the driving assembly, then the crankshaft is driven to rotate, the crankshafts on two sides of the pump body rotate synchronously, and then the conveying pistons are driven to synchronously operate.

Furthermore, a mechanical seal is arranged at the insertion opening of the transmission chamber and the main transmission rod.

Through above-mentioned scheme, set up mechanical seal and avoid external debris to get into transmission room and bearing department, promote the adaptability to adverse circumstances.

Furthermore, the conveying cavity is in a symmetrical cross-shaped structure.

Through the scheme, the conveying cavity is of a symmetrical cross-shaped structure and is uniformly distributed, and impact can be uniformly dispersed to each inner wall when the conveying cavity bears the impact.

Furthermore, the pump body is provided with a reinforcing beam at the peripheries of the connected piston chamber, the oil inlet and the oil outlet.

Through above-mentioned scheme, set up the holistic structural strength of reinforcing beam hoisting device.

Furthermore, the pump body is a cuboid, the connected piston chamber is located in the middle of the cuboid, and the conveying pistons are arranged in a straight line in a head-to-head mode.

Through the scheme, the connected piston chambers are uniformly distributed in the middle of the cuboid, the conveying pistons are arranged in a straight line in a head-to-head mode, heavy cylinder bases are not arranged, overall balance weight balancing is facilitated, and piston motion impact is offset to reduce vibration.

Furthermore, the periphery of the pump body is connected with a reinforcing plate through bolts.

Through above-mentioned scheme, set up the structural strength that the reinforcing plate further promoted the pump body, hoisting device's shock resistance.

The utility model has the following beneficial effects:

1. the utility model has simple structure, at least one group of conjoined piston cylinders are symmetrically arranged, each group of conjoined piston cylinders are provided with 2 conveying pistons, when an oil inlet and an oil outlet of a pump body are connected with corresponding pipelines of an oil well and a power supply of a pump power source motor is switched on and started, the pump starts to carry out a relay pumping task of a mixture of oil, gas, sand and the like pumped by the oil well, a synchronous transmission mechanism in a transmission chamber is driven by the motor to rotate, a driving assembly in a driving bin is driven to operate, the conveying pistons are driven to simultaneously start, the conveying pistons synchronously rotate, the pump carries out suction and discharge motion in the conjoined piston chambers through the conveying pistons under the driving of the motor, uninterrupted relay pumping is carried out, particularly, the conveying pistons are driven by the driving assembly to move towards one side far away from each other, at the moment, a feeding valve is opened, a discharge valve is closed, and suction force is formed in the conveying cavity to suck the oil-gas-liquid mixture, and then the conveying piston moves relatively, the discharge valve is opened, the feeding valve is closed, the material in the conveying cavity is pushed out along the discharge valve, and the conveying task is completed in a repeated way. The two conveying pistons are arranged oppositely, so that mechanical vibration generated during operation is reduced, the operation is stable, safe and reliable, the advantages of a piston pump are inherited, the defects of the conventional mixed conveying pump are overcome, the requirements of high-speed, high-efficiency, long-time and high-capacity relay pumping of an oil well in an oil field can be met, the conventional other mixed conveying relay pumps can be completely replaced, and the market prospect is wide;

2. the motor rotates to drive the main transmission rod to rotate, then the first bevel gear on the main transmission rod rotates to drive the meshed second bevel gear to rotate, then the crankshaft is driven to rotate, the crankshafts positioned on two sides of the pump body synchronously rotate, then power is synchronously transmitted to the driving assembly, and the conveying piston is driven to synchronously operate, so that the structure is simple, and the operation is stable;

3. the crankshaft synchronously rotates, so that the conveying piston rods are driven to move through the crankshaft connecting rod necks, the conveying pistons on the two sides are driven to synchronously move in the opposite directions or in the opposite directions, mechanical vibration generated by operation is reduced, and the synchronous rotation of the crankshaft and the conveying piston rods is stable, safe and reliable in work.

Drawings

FIG. 1 is a schematic view of a rotary pump according to the prior art;

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

FIG. 3 is a schematic cross-sectional view of the present invention;

FIG. 4 is a top view of the present invention;

reference numerals: 10. a pump body; 11. an oil inlet; 12. an oil outlet; 13. a piston connecting rod; 15. a connected piston chamber; 16. a delivery piston; 17. a delivery lumen; 18. a transmission chamber; 19. a driving bin; 20. reinforcing the beam; 21. a reinforcing plate; 22. a main transmission rod; 23. a first bevel gear; 24. a lower journal of the crankshaft; 25. a second bevel gear; 26. mechanical sealing; 27. a crankshaft; 28. an upper journal of the crankshaft; 29. a crankshaft connecting rod journal; 30. A bearing; 31. and a bearing seat.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Example 1

As shown in fig. 2 to 4, the present embodiment provides a novel petroleum relay pump, which includes a pump body 10, an oil inlet 11, an oil outlet 12, a feed valve (not shown in the drawings) disposed at the oil inlet 11, a discharge valve (not shown in the drawings) disposed at the oil outlet 12, 1 (or more) sets of connected piston chambers 15 symmetrically disposed in the pump body 10, in this embodiment, a set of connected piston chambers 15 is disposed, 2 delivery pistons 16 are relatively disposed in the connected piston chambers 15, the discharge valve between the ends of the oil inlet 11 and the oil outlet 12 and the cavity surrounded by the delivery pistons 16 at the maximum reverse stroke of the connected piston chambers 15 together form a delivery cavity 17, a synchronous transmission mechanism for driving the delivery pistons 16 to synchronously rotate is connected to the pump body 10, the synchronous transmission mechanism includes a transmission chamber 18 and a driving chamber 19 disposed at two sides of the pump body 10, the driving chamber 19 is disposed opposite to the connected piston chambers 15, a synchronous component is arranged in the transmission chamber 18, a driving component for driving the conveying piston 16 is arranged in the driving bin 19, the synchronous component is connected with the driving component, and the synchronous transmission mechanism is driven by a motor. After the oil inlet 11 and the oil outlet 12 of the pump body 10 are connected with corresponding pipelines of the oil well, and the power supply of the pump power source motor is switched on and started, the pump starts to pump the mixture of oil, gas, sand and the like from the oil well in a relay way. The motor drives the synchronous transmission mechanism in the transmission chamber 18 to rotate, then drives the driving component in the driving bin 19 to operate, then drives the conveying piston 16 to start and synchronously rotate at the same time, and under the driving of the motor, the pump performs reciprocating suction and discharge motion in the connected piston chamber 15 through the conveying piston 16 to execute uninterrupted relay oil pumping. Specifically, when the conveying piston 16 is driven by the driving assembly to move in opposite directions, the feeding valve is opened, the discharge valve is closed, suction force is formed in the conveying cavity 17 to suck the oil-gas-liquid mixture, then when the conveying piston 16 moves relatively, the discharge valve is opened, the feeding valve is closed, the material in the conveying cavity 17 is pushed out along the discharge valve, and the steps are repeated to finish the conveying task.

Referring to fig. 2 and 3, in order to improve the overall shock resistance of the device and reduce mechanical vibration, the conveying cavity 17 is of a symmetrical cross-shaped structure, the pump body 10 is provided with reinforcing beams 20 at the peripheries of the connected piston chamber 15, the oil inlet 11 and the oil outlet 12, the pump body 10 is a cuboid, the connected piston chamber 15 is arranged in the middle of the cuboid, the conveying pistons 16 are arranged in a line in a butt joint manner, and the periphery of the pump body 10 is in bolted connection with a reinforcing plate 21. The conveying cavity 17 is of a symmetrical cross-shaped structure, is uniformly distributed, can uniformly disperse impact to each inner wall when bearing impact, and is provided with a reinforcing beam 20 to improve the overall structural strength of the device. The connected piston chambers 15 are uniformly distributed in the middle of the cuboid, and the conveying pistons 16 are arranged in a line and in a head-to-head mode, so that the whole balance weight is balanced conveniently, the vibration is reduced, and the structural strength of the pump body 10 and the shock resistance of the device are further improved by arranging a reinforcing class.

Referring to fig. 3, 2 transmission chambers 18 and driving chambers 19 are symmetrically disposed at both sides of the pump body 10. The driving assembly of the driving cabin 19 comprises crankshafts 27 arranged in 2 driving cabins 19, the piston connecting rod 13 is arranged on the conveying piston 16, bearings 30 and bearing seats 31 are arranged between two ends of the crankshafts 27 and the driving cabins 19, each crankshaft 27 comprises a crankshaft lower journal 24, a crankshaft upper journal 28, a crankshaft connecting rod journal 29 and the like, the end part of the crankshaft lower journal 24 is connected with the synchronizing assembly, the synchronizing assembly in the driving chamber 18 comprises a main transmission rod 22, a first bevel gear 23 and a second bevel gear 25 which are arranged between 2 driving chambers 18, the first bevel gear 23 is arranged at two ends of the main transmission rod 22 and is in key connection with the main transmission rod 22, the driving chamber 18 is provided with a bearing at the connection part of the main transmission rod 22, a mechanical seal 26 is arranged at the insertion connection opening of the driving chamber 18 and the main transmission rod 22, the mechanical seal 26 prevents external impurities from entering the driving chamber 18 and the bearings, and improves the adaptability to severe environment, a second bevel gear 25 engaged with the first bevel gear 23 is arranged at the end of the lower crankshaft journal 24, the second bevel gear 25 is connected with the lower crankshaft journal 24 by a key, and a crankshaft connecting rod journal 29 is movably connected with the transmission piston 16 through a piston connecting rod 13. The motor rotates to drive the main transmission rod 22 to rotate, then the first bevel gear 23 on the main transmission rod 22 rotates to drive the meshed second bevel gear 25 to rotate, then the crankshaft lower journal 24 is driven to rotate, the crankshaft lower journal 24 transmits power to the crankshaft 27 synchronously, the crankshaft 27 drives the conveying piston 16 to synchronously operate through the piston connecting rod 13 movably connected with the crankshaft connecting rod journal 29 on the crankshaft 27, and the reciprocating motion is carried out in the opposite direction and the reverse direction, so that the oil well extract is conveyed. The design concept of the device is ingenious, the structure is symmetrical, the operation is stable, and the device is safe and reliable.

The implementation principle is as follows: the utility model discloses a novel petroleum relay pump, which is characterized in that a connected piston cylinder and an opposite piston 16 are symmetrically arranged, and a synchronous transmission driving mechanism and a synchronous transmission driving technology are adopted, when an oil inlet 11 and an oil outlet 12 of a pump body 10 are connected with corresponding pipelines of an oil well and a power supply of a pump power source motor is switched on and started, the pump starts to carry out relay pumping of a mixture of oil, gas, sand and the like pumped from the oil well, the synchronous transmission mechanism in a transmission chamber 18 is driven to rotate by the motor, namely the motor rotates to drive a main transmission rod 22 to rotate, then a first bevel gear 23 on the main transmission rod 22 rotates to drive a second bevel gear 25 which is meshed to rotate, then a lower shaft neck 24 of a crankshaft is driven to rotate, as the lower shaft neck 24 of the crankshaft is integrated with the crankshaft 27, power is synchronously transmitted to the driving component, then the driving component in a driving bin 19 is driven to operate, namely the lower shaft neck 24 of the crankshaft rotates to synchronously drive the crankshaft 27 to rotate, the crankshaft connecting rod journal 29 on the crankshaft 27 is movably connected with one end of the piston connecting rod 13, the other end of the piston connecting rod 13 is movably connected with the piston 16, and the crankshaft lower journal 24 drives the crankshaft 27 to rotate, so that the crankshaft connecting rod journal 29 drives the connecting rod 13 to drive the conveying piston 16 to move in a chain reaction, the pistons 16 are driven to synchronously move oppositely and oppositely through the crankshaft 27, and the opposite hedging cancellation effect of the pistons 16 reduces mechanical vibration generated by operation. Under the drive of the motor, the pump performs reciprocating suction and discharge motion in the connected piston chamber 15 through the delivery piston 16 to execute uninterrupted relay oil pumping, in particular to when the delivery piston 16 is driven by the driving component to perform reverse motion, the inlet valve is opened, the discharge valve is closed, negative pressure is formed in the conveying cavity 17 to suck the oil-gas-liquid mixture, then when the conveying piston 16 moves relatively, the discharge valve is opened, the inlet valve is closed, the material in the conveying cavity 17 is extruded and discharged, the application adopts the two conveying pistons 16 to be oppositely arranged, reduces the mechanical vibration generated by the operation, has stable, safe and reliable work, not only inherits the advantages of the piston pump, but also overcomes the defects of the existing mixed conveying pump, the relay pump can meet the requirements of high-speed, high-efficiency, long-time and high-capacity relay pumping of oil wells in oil fields, can completely replace other existing mixed transportation relay pumps, and has wide market prospect.

Claims (8)

1. The novel petroleum relay pump is characterized by comprising a pump body (10), an oil inlet (11) and an oil outlet (12), wherein a feed valve is arranged at the oil inlet (11), a discharge valve is arranged at the oil outlet (12), at least one group of connected piston chambers (15) are arranged in the pump body (10), 2 conveying pistons (16) are relatively assembled in each group of the connected piston chambers (15), the feed valve at the end of the oil inlet (11), the discharge valve at the end of the oil outlet (12) and a cavity formed by the two conveying pistons (16) in the maximum reverse movement stroke of the connected piston chambers (15) form a conveying cavity (17), a synchronous transmission mechanism for driving the conveying pistons (16) to synchronously rotate is connected onto the pump body (10) and comprises transmission chambers (18) and driving chambers (19) which are arranged on two sides of the pump body (10), and the driving chambers (19) are just opposite to the connected piston chambers (15), a synchronous component is arranged in the transmission chamber (18), a driving component for driving the conveying piston (16) is arranged in the driving bin (19), the synchronous component is connected with the driving component, and the synchronous transmission mechanism is driven by a motor.

2. The novel petroleum relay pump according to claim 1, wherein said drive assembly includes a crankshaft (27) disposed within a drive sump (19), the crankshaft (27) comprises a crankshaft lower journal (24), a crankshaft upper journal (28) and a crankshaft connecting rod journal (29), the crankshafts (27) are symmetrically arranged in the driving bins (19) at two sides of the pump body (10), the crankshaft lower journal (24) is connected with the synchronous component, a piston connecting rod (13) movably connected with the crankshaft connecting rod journal (29) is arranged on the conveying piston (16), the crankshaft connecting rod journal (29) is movably connected with one end of the piston connecting rod (13), the other end of the piston connecting rod (13) is movably connected with a conveying piston (16), and a bearing (30) and a bearing seat (31) are arranged between the two ends of the crankshaft (27) and the driving bin (19).

3. The novel petroleum relay pump as claimed in claim 2, wherein the synchronizing assembly comprises 2 main transmission rods (22) arranged between the transmission chambers (18), first bevel gears (23) are arranged at two ends of each main transmission rod (22), the first bevel gears (23) are connected with the main transmission rods (22) through key connection, lower crankshaft journals (24) connected with the driving assembly are arranged at the upper ends of the driving bins (19), second bevel gears (25) meshed with the first bevel gears (23) are arranged at the lower end ends of the lower crankshaft journals (24), the second bevel gears (25) are connected with the lower crankshaft journals (24) through key connection, and bearings are arranged between the transmission chambers (18) and the main transmission rods (22).

4. A novel oil relay pump according to claim 3, characterized in that the opening of the transmission chamber (18) to which the main transmission rod (22) is plugged is provided with a mechanical seal (26).

5. The new petroleum relay pump according to claim 1, characterized in that said delivery chamber (17) presents a symmetrical cross-shaped structure.

6. The novel petroleum relay pump as claimed in claim 1, wherein the pump body (10) is provided with a reinforcing beam (20) at the periphery of the portions of the conjoined piston chamber (15), the oil inlet (11) and the oil outlet (12).

7. The novel petroleum relay pump according to claim 1, characterized in that the pump body (10) is a cuboid, the conjoined piston chamber (15) is located in the middle of the cuboid, and the conveying pistons (16) are arranged in a line and in a head-to-head manner.

8. The novel petroleum relay pump according to claim 7, characterized in that the periphery of the pump body (10) is bolted with a reinforcing plate (21).

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