CN213711449U - Hydraulic buffer device and fracturing truck - Google Patents

Abstract

The utility model relates to a fracturing truck technical field to a hydraulic buffer and fracturing truck is provided, the fracturing truck includes the fracturing pump, hydraulic buffer includes driving motor, oil feed connecting piece and energy storage buffer structure, driving motor with the fracturing pump drive is connected, the last oil inlet that is equipped with of driving motor, the first end of oil feed connecting piece with the oil inlet communicates, the second end of oil feed connecting piece with energy storage buffer structure communicates, energy storage buffer structure is suitable for absorbing the pressure fluctuation that the fracturing pump fed back to on the driving motor, the third end of oil feed connecting piece with the fracturing pump communicates; the utility model discloses a through oil feed connecting piece installation energy storage buffer structure on driving motor to can absorb the fracturing pump and feed back pressure fluctuation on the driving motor avoids the pressure fluctuation to cause the injury to the hydraulic system pipeline of fracturing truck, corresponding its life that prolongs.

Description

Hydraulic buffer device and fracturing truck

Technical Field

The utility model relates to a fracturing unit truck technical field particularly, relates to a hydraulic buffer and fracturing unit truck.

Background

At present, a hydraulic fracturing truck mainly comprises an execution structure and a hydraulic system, wherein the execution mechanism usually adopts a fracturing pump which is a plunger pump, certain discharge capacity fluctuation exists due to the inherent characteristic of the plunger pump, and the certain discharge capacity fluctuation is fed back to the hydraulic system to cause the fluctuation of the hydraulic system, and in certain discharge capacity range, system resonance is caused due to the superposition of the fluctuation frequency of the plunger pump and the inherent frequency of the hydraulic system, so that the hydraulic system is caused to generate violent fluctuation, the pressure fluctuation can reach 16MPa, and further the hydraulic system of the fracturing truck is caused to transmit huge energy, which reaches over three thousand horsepower, the vibration energy is huge, great potential damage is generated to a pipeline of the hydraulic system, and the service lives of the hydraulic system and the fracturing truck are further influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a problem how to design a hydraulic buffer that can cushion the pressure oscillation that absorbs the fracturing pump and produce.

In order to solve the problem, the utility model provides a hydraulic buffer is applied to the fracturing truck, the fracturing truck includes the fracturing pump, hydraulic buffer includes driving motor, oil feed connecting piece and energy storage buffer structure, driving motor with the fracturing pump drive is connected, the last oil inlet that is equipped with of driving motor, the first end of oil feed connecting piece with the oil inlet intercommunication, the second end of oil feed connecting piece with energy storage buffer structure intercommunication, energy storage buffer structure is suitable for the absorption the fracturing pump feeds back pressure fluctuation on the driving motor, the third end of oil feed connecting piece with the fracturing pump intercommunication.

Therefore, the driving motor is in driving connection with the fracturing pump, the fracturing pump drives the fluid load to perform pumping-in and discharging intermittent cycle operation, in the working process of driving the fluid load to move by the fracturing pump, the fracturing pump generates certain fluctuation due to the cycle change of the working number of plungers of the fracturing pump and the pumping-in and discharging operation of the fluid load, an oil inlet connecting piece is arranged at an oil inlet of the driving motor, the third end of the oil inlet connecting piece is communicated with the fracturing pump, so that a closed oil path is formed between the driving motor and the fracturing pump, the first end and the second end of the oil inlet connecting piece are respectively communicated with the driving motor and the energy storage buffer structure, the energy storage buffer structure absorbs the fluctuation of the fluid load and feeds the fluctuation back to the fracturing pump and transmits the fluctuation to the pressure of the hydraulic system pipeline of the fracturing truck, and the damage to the hydraulic system pipeline is reduced, and then the service life of corresponding extension hydraulic system and fracturing unit truck.

Optionally, the oil inlet connecting piece is a three-way valve block, a three-way electromagnetic valve or a three-way pipe.

Therefore, the oil inlet connecting piece is a three-way valve block, any one of a three-way electromagnetic valve and a three-way pipe, the oil inlet connecting piece is provided with a first end, a second end and a third end, the first end of the oil inlet connecting piece is communicated with an oil inlet on the driving motor at the moment, the second end of the oil inlet connecting piece is communicated with the energy storage buffering structure, the energy storage buffering structure absorbs fluid load fluctuation, the fluid load fluctuation is fed back to the fracturing pump and is transmitted to the pressure fluctuation of the driving motor, the third end of the oil inlet connecting piece is communicated with the fracturing pump, the fracturing pump is realized through the oil inlet connecting piece with the three ends, the driving motor and the energy storage buffering structure are communicated in pairs.

Optionally, the number of the driving motors is multiple, the number of the oil inlet connectors and the number of the energy storage buffer structures are matched with the number of the driving motors, and each oil inlet connector installed on each driving motor is respectively suitable for being connected with each energy storage buffer structure; the driving motors are respectively in driving connection with the fracturing pump and are suitable for driving the fracturing pump together.

From this, through an oil feed connecting piece installation energy storage buffer structure on every driving motor to when pressure oscillation on the fracturing pump transmits each driving motor, through installing each energy storage buffer structure on each driving motor, can absorb pressure oscillation simultaneously, realize the quick absorption of pressure oscillation on the fracturing pump, avoid the pressure oscillation to reach hydraulic system's pipeline. The fracturing pump is driven by a plurality of driving motors together, so that the output load of each driving motor can be reduced and the fracturing pump can be driven to move more stably compared with the condition that one driving motor drives the whole fracturing pump.

Optionally, the energy storing and buffering structure is mounted adjacent to the driving motor.

From this, when installation energy storage buffer structure, energy storage buffer structure passes through the oil feed connecting piece and installs on driving motor, and the mounted position through making energy storage buffer structure closes on driving motor to can make the fluid load fluctuation feed back to the fracturing pump and transmit the pressure fluctuation on the driving motor and can be absorbed by energy storage buffer structure at the very first time, with the absorption efficiency who improves the pressure fluctuation.

Optionally, the energy storage buffer structure is an energy accumulator, and the energy accumulator is communicated with the second end of the oil inlet connecting piece.

Therefore, the first end of the oil inlet connecting piece is communicated with the oil inlet of the driving motor, the second end of the oil inlet connecting piece is communicated with the energy accumulator, and when pressure fluctuation on the fracturing pump is transmitted to the driving motor, the pressure fluctuation can be quickly absorbed by the energy accumulator; and because the energy storage ware communicates with the second end of oil feed connecting piece to realize the quick assembly disassembly of energy storage ware.

Optionally, the accumulator is any one of a spring type accumulator, a piston type accumulator and a gas type accumulator.

From this, the energy storage adopts any kind in spring energy storage ware, piston energy storage ware and the gas type energy storage ware, and because spring energy storage ware, piston energy storage ware and gas type energy storage ware all adopt the prior art on the market to when the energy storage ware breaks down, directly demolish change can, and spring energy storage ware, piston energy storage ware and gas type energy storage ware all can be used for the pressure buffering in the hydraulic system, the selection of energy storage ware is used for more nimble.

The utility model provides a fracturing truck, include the fracturing pump and as aforesaid hydraulic buffer, among the hydraulic buffer drive motor with the fracturing pump drive is connected, be equipped with the oil inlet on the drive motor, among the hydraulic buffer energy storage buffer structure with the oil inlet intercommunication, fracturing truck's beneficial effect with hydraulic buffer's beneficial effect is no longer repeated here.

Optionally, the fracturing pump comprises a mounting frame, a pump crankshaft and a transmission gear, wherein an accommodating cavity is formed in the mounting frame, the transmission gear is embedded in the accommodating cavity, and the pump crankshaft penetrates through the mounting frame and is in transmission connection with the transmission gear;

the number of the driving motors is multiple, each driving motor comprises a motor body and a driving gear, the motor bodies are arranged on the outer side wall of the mounting frame in a circumferential mode and penetrate through the outer side wall of the mounting frame, the motor bodies are respectively in driving connection with the driving gears, the driving gears are arranged on the outer circumferential direction of the transmission gears in a circumferential mode, and the driving gears are respectively in meshing connection with the transmission gears.

Therefore, the transmission gear is arranged in the accommodating cavity of the mounting frame, the pump crankshaft penetrates through the mounting frame and is in transmission connection with the transmission gear, so that the pump crankshaft and the transmission gear are arranged on the mounting frame, and the mounting frame provides a supporting function for the transmission gear and the pump crankshaft; the fracturing pump is characterized in that each motor body of the driving motors is arranged on the outer side wall of the mounting frame, the driving gears of the driving motors are arranged on the transmission gears in a circumferential mode, the driving gears are meshed with the transmission gears respectively, and the motor bodies drive the transmission gears to rotate together through the driving gears, so that the fracturing pump can be stably driven to large fluid loads.

Optionally, the fracturing pump further includes a plurality of sealing structures, a plurality of mounting holes are circumferentially arranged on the mounting frame, each sealing structure is respectively disposed on each mounting hole, and each motor body is respectively disposed on each sealing structure in a penetrating manner.

Therefore, each sealing structure is arranged on each mounting hole on the mounting frame, so that each motor body is arranged at each mounting hole on the mounting frame through each sealing structure, impurities or oil leakage between the motor body and the mounting frame is avoided, and the sealing performance between the motor body and the mounting frame is ensured.

Optionally, the mounting frame is of a hollow disc structure, the plurality of driving motors are divided into two groups, the two groups of driving motors are respectively arranged on two side walls of the disc structure, and the two groups of driving motors are respectively in driving connection with the fracturing pump so as to drive the fracturing pump together; and a plurality of driving motors in each group are arranged on the side wall of the disc structure in a circumferential manner.

Therefore, the two groups of driving motors are respectively arranged on the mounting rack in a disc structure, so that the utilization rate of two side walls of the mounting rack is fully utilized, and the fracturing pump is driven by the two groups of driving motors together, so that the stable driving of the fracturing pump is realized; a plurality of driving motors in each group are arranged in a circumferential mode, so that the driving ends of the driving motors are respectively connected with the fracturing pump in a driving mode, the driving motors are installed neatly, the mounting positions of the driving motors on the side wall of the disc structure are balanced in stress, and the mounting frame is prevented from deforming.

Drawings

Fig. 1 is a schematic structural view of a fracturing truck in an embodiment of the present invention;

fig. 2 is a schematic view of a partial structure of a fracturing pump in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a hydraulic buffer device in an embodiment of the present invention.

Description of reference numerals: 1-a drive motor; 2-a fracturing pump; 21-a mounting frame; 211-mounting holes; 22-a sealing structure; 3-energy storage buffer structure; 4-oil inlet connection.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the terms "an example," "one example," and "one implementation," etc., mean that a particular feature, structure, material, or characteristic described in connection with the example or implementation is included in at least one example or implementation of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or implementation. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.

For solving above-mentioned technical problem, it is shown with reference to fig. 1 and 3 to combine, the embodiment of the utility model provides a hydraulic buffer device is applied to the fracturing truck, the fracturing truck includes fracturing pump 2, hydraulic buffer device includes driving motor 1, oil feed connecting piece 4 and energy storage buffer structure 3, driving motor 1 with 2 drive connections of fracturing pump, be equipped with the oil inlet on driving motor 1, the first end of oil feed connecting piece 4 with the oil inlet intercommunication, the second end of oil feed connecting piece 4 with energy storage buffer structure 3 intercommunication, energy storage buffer structure 3 is suitable for the absorption fracturing pump 2 feeds back to pressure fluctuation on the driving motor 1, the third end of oil feed connecting piece 4 with fracturing pump 2 intercommunication.

It should be noted that three connectors, namely a first end, a second end and a third end, are arranged on the oil inlet connecting piece 4, the first end of the oil inlet connecting piece 4 is communicated with an oil inlet on the driving motor 1, the second end of the oil inlet connecting piece 4 is connected with the energy storage buffer structure 3, and the third end of the oil inlet connecting piece 4 is communicated with the fracturing pump 2 through a high-pressure oil pipe; the fracturing pump 2 drives a fluid load to perform pumping-in and discharging intermittent circulation operation through the driving connection of the driving motor 1 and the fracturing pump 2, in the working process of driving the fluid load to move by the fracturing pump 2, the fracturing pump 2 generates certain fluctuation due to the cyclic change of the working number of plungers of the fracturing pump 2 and the pumping-in and discharging operation of the fluid load, an oil inlet connecting piece 4 is arranged at an oil inlet of the driving motor 1, the third end of the oil inlet connecting piece 4 is communicated with the fracturing pump 2, so that a closed oil path is formed between the driving motor 1 and the fracturing pump 2, the first end and the second end of the oil inlet connecting piece 4 are respectively communicated with the driving motor 1 and the energy storage buffer structure 3, and then the energy storage buffer structure 3 absorbs the fluctuation of the fluid load and feeds back the fluctuation to the fracturing pump 2, so that the pressure fluctuation is prevented from being transmitted to a hydraulic system pipeline of a fracturing truck to reduce the damage to the hydraulic system, and then the service life of corresponding extension hydraulic system and fracturing unit truck.

In the embodiment, the fracturing pump 2 is used for converting mechanical energy output by the driving motor 1 into hydraulic energy so as to provide liquid flow with certain pressure and flow rate to a hydraulic system of a fracturing truck, the fracturing pump 2 can adopt a three-cylinder plunger pump, a five-cylinder plunger pump and a seven-cylinder plunger pump according to the magnitude of corresponding fluid load, for example, a horizontal plunger pump can be adopted as the five-cylinder plunger pump, wherein the horizontal plunger pump is formed by installing a plurality of plungers in parallel, and a crankshaft directly pushes the plungers to reciprocate through a connecting rod sliding block or an eccentric shaft so as to realize a hydraulic pump for sucking and discharging liquid; the fracturing pump 2 can also adopt other kinds of hydraulic pumps, such as a single plunger pump, an axial plunger pump and a radial plunger pump; the driving motor 1 can adopt a hydraulic motor, the hydraulic motor is in driving connection with the fracturing pump 2 and is used for converting the pressure of hydraulic oil entering a high-pressure oil port from a high-pressure oil pipe through the oil inlet connecting piece 4 into mechanical energy for rotating an output shaft, so that a plurality of plungers of the fracturing pump 2 are pushed to reciprocate up and down, and the fracturing pump 2 completes an oil pumping task; when the fracturing pump 2 drives the fluid load to move, the fluid load is pumped at low pressure and then discharged at high pressure; the driving motor 1 can be a unidirectional quantitative hydraulic motor, a unidirectional variable hydraulic motor, a bidirectional quantitative hydraulic motor or a bidirectional variable hydraulic motor, and the specific type of the driving motor 1 can be flexibly selected according to the actual situation of the fluid load, which is not described herein.

In this embodiment, the fracturing truck is a special vehicle for injecting high pressure, high displacement fracturing fluid into the well, fracturing the formation and pushing proppant into the fracture. The method is mainly used for various fracturing operations of oil, gas and water wells, and can also be used for operations such as hydraulic sand blasting, coal mine high-pressure hydraulic coal mining, ship high-pressure hydraulic rust removal and the like. The equipment can perform stand-alone and on-line operation. The fracturing truck mainly comprises a vehicle-carrying chassis, a truck platform engine, a truck platform transmission case, a fracturing pump 2, a manifold system, a lubricating system, a circuit system, a gas circuit system, a hydraulic system and the like, wherein the fracturing truck is the prior art and is not described herein in detail.

In an embodiment of the present invention, the oil inlet connector 4 is a three-way valve block, a three-way solenoid valve, or a three-way pipe.

It should be noted that, if the oil inlet connecting piece 4 is a three-way valve block, the three-way valve block is a hydraulic valve block, and the three-way valve block can be made of stainless steel wear-resistant materials, so that the service life is ensured to be longer; the three-way valve block can adopt a rectangular structure, three oil ports are arranged on the rectangular structure and respectively comprise a first end, a second end and a third end, the first end is communicated with an oil inlet pipe of the driving motor 1, the energy storage buffer structure 3 is communicated with the second end, namely, an internal thread is arranged inside the second end, an external bolt is arranged at the end part of the energy storage buffer structure 3, the energy storage buffer structure 3 is in threaded connection with the internal thread of the second end through an external thread at the end part of the energy storage buffer structure, so that the energy storage buffer structure is installed on the driving motor 1, the pressure fluctuation transmitted to the driving motor 1 by the fracturing pump 2 is absorbed through the energy storage buffer structure 3, and the third end is communicated with the fracturing pump 2 through a high-pressure oil pipe, so that a closed; the three-way valve block can be fixedly installed on the shell of the driving motor 1 through bolts and also can be fixedly installed on the shell of the driving motor 1 through a welding mode, so that the installation stability of the driving motor 1 and the three-way valve block is ensured, and the three-way valve block is prevented from loosening, and the three-way valve block is combined with a structure shown in fig. 3.

In this embodiment, the oil inlet connector 4 may also be a three-way electromagnetic valve, that is, a three-way joint is provided on the three-way electromagnetic valve, and is a first end, a second end and a third end, the three-way electromagnetic valve may control the connection or disconnection of any oil path of the three-way electromagnetic valve through an external controller, for example, an oil path between the fracturing pump 2 and the driving motor 1, an oil path between the driving motor 1 and the energy storage buffer structure 3, or an oil path between the fracturing pump 2 and the energy storage buffer structure 3, the three-way electromagnetic valve employs a commonly used three-way electromagnetic valve in the prior art, and thus.

In this embodiment, the oil inlet connector 4 may also be a three-way pipe, the three-way pipe may adopt a shock-resistant and corrosion-resistant three-way pipe structure commonly used in the market, and not only corrodes with the hand fracturing fluid for a long time, but also can bear the pressure fluctuation transmitted from the driving motor 1, and accordingly the service life of the three-way pipe is prolonged, and the three joints are provided on the three-way pipe, namely the first joint, the second joint and the third joint; the three-way pipe can also be a corrosion-resistant rubber three-way pipe or a three-way pipe supported by other materials with wear resistance and shock resistance, and is not limited herein.

In the above embodiment, no matter the oil inlet connecting piece 4 is a three-way valve block, a three-way electromagnetic valve or a three-way pipe, the joint between the first end of the oil inlet connecting piece 4 and the oil inlet of the driving motor 1, the joint between the second end of the oil inlet connecting piece 4 and the energy storage buffer structure 3, and the joint between the oil inlet connecting piece 4 and the fracturing pump 2 are respectively provided with a sealing gasket/sealing ring, so that the sealing performance of each joint is ensured, and oil leakage is prevented. And through the oil inlet connecting piece 4 with three ends, the fracturing pump 2, the driving motor 1 and the energy storage buffer structure 3 are communicated pairwise, and then the fracturing pump 2, the driving motor 1 and the energy storage buffer structure 3 are quickly connected and assembled.

In an embodiment of the present invention, as shown in fig. 1, the number of the driving motors 1 is plural, and the number of the oil inlet connectors 4 and the number of the energy storage buffer structures 3 are matched with the number of the driving motors 1, and each of the oil inlet connectors 4 installed on each of the driving motors 1 is respectively adapted to be connected to each of the energy storage buffer structures 3; the driving motors 1 are respectively in driving connection with the fracturing pump 2, and the driving motors 1 are suitable for driving the fracturing pump 2 together.

It should be noted that, because the fluid load driven by the fracturing pump 2 of the fracturing truck is large, the fracturing pump 2 needs to be driven by a plurality of driving motors 1 to move together, so that the fracturing pump 2 is ensured to have a sufficient pressure to pump the fluid load; the quantity of the oil inlet connecting pieces 4 and the quantity of the energy storage buffer structures 3 are matched with that of the driving motors 1, the oil inlet connecting pieces 4 are installed at oil inlets of the driving motors 1, the second ends of the oil inlet connecting pieces 4 are communicated with the energy storage buffer structures 3, when the fracturing pump 2 works, severe fluctuation is generated and transmitted to the driving motors 1, the pressure fluctuation can be absorbed simultaneously through the energy storage buffer structures 3 installed on the driving motors 1, the pressure fluctuation on the fracturing pump 2 is absorbed quickly, and therefore the phenomenon that the pressure fluctuation transmits to a hydraulic system pipeline of a fracturing truck to reduce damage to the hydraulic system pipeline is avoided; a plurality of 1 interval settings of CD-ROM drive motors are on fracturing pump 2, and a plurality of 1 drive motors are connected with the drive gear drive of fracturing pump 2 respectively, move through a 1 drive fracturing pump 2 of CD-ROM drive motor relatively, drive fracturing pump 2 work jointly by a plurality of 1 drive motors, for the whole fracturing pump 2 of a 1 drive motor drive, not only can reduce every 1 output of CD-ROM drive motor, and drive fracturing pump 2 jointly through a plurality of 1 drive motors, make fracturing pump 2's operation more steady.

In an embodiment of the present invention, as shown in fig. 1, the energy storage buffer structure 3 is installed near the driving motor 1.

It should be noted that the energy storage buffer structure 3 is installed on the driving motor 1 through the oil inlet connecting piece 4, and the installation position of the energy storage buffer structure 3 is closer to the driving motor 1 than the fracturing pump 2 or the fluid load, that is, the thickness of the oil inlet connecting piece 4 installed between the energy storage buffer structure 3 and the driving motor 1 is reduced as much as possible, and further, the fluctuation of the fluid load is fed back to the fracturing pump 2 and the pressure fluctuation transmitted to the driving motor 1 can be quickly absorbed and eliminated by the energy storage buffer structure 3, so that the absorption efficiency of the pressure fluctuation is improved, and the pressure fluctuation can be prevented from being transmitted to the hydraulic system pipeline of the fracturing truck to reduce the damage to the hydraulic system pipeline.

In an embodiment of the present invention, the energy storage buffer structure 3 is an energy accumulator, and the energy accumulator is communicated with the second end of the oil inlet connecting member 4.

It should be noted that the energy storage buffer structure 3 is an energy accumulator, the energy storage buffer structure 3 can adopt an energy accumulator commonly used in the market, and a second end of the energy accumulator is communicated with an oil inlet connecting piece 4 installed on the driving motor 1 and used for absorbing pressure fluctuation transmitted from the fracturing pump 2 to the driving motor 1; an internal thread is arranged on the inner wall of the second end of the oil inlet connecting piece 4, an external thread is arranged outside one end of the energy accumulator, and when one end of the energy accumulator is in threaded connection with the second end of the oil inlet connecting piece 4, the energy accumulator and the oil inlet connecting piece 4 can be quickly disassembled and assembled; the accumulator is one energy accumulating device for hydraulic and pneumatic system, and can convert the energy in the hydraulic system, i.e. pressure fluctuation, into compression energy or potential energy for storage at proper time. When the pressure of the hydraulic system is increased instantaneously, the energy of the part can be absorbed so as to ensure that the pressure of the whole hydraulic system is normal.

In an embodiment of the present invention, the energy accumulator is any one of a spring type energy accumulator, a piston type energy accumulator and a gas type energy accumulator.

It should be noted that, when the energy accumulator can adopt a spring type energy accumulator commonly used in the market, the spring type energy accumulator mainly depends on an internal compression spring to absorb pressure fluctuation on the driving motor 1 and further convert the pressure fluctuation into spring potential energy to be stored, and the spring type energy accumulator is released when needed, and has a simple structure and low cost. The piston type energy accumulator absorbs pressure fluctuation on the driving motor 1 mainly by lifting a mass block loaded on a sealing piston so as to convert the pressure fluctuation into gravitational potential energy to be accumulated, and has simple structure and stable pressure. The gas accumulator performs energy conversion by compressing gas based on boehler's law (PVn-K-constant), and when in use, the accumulator is first charged with gas of a predetermined pressure. When the pressure fluctuation on the driving motor 1 exceeds the internal pressure of the energy accumulator, the oil compresses gas, and the pressure in the oil is converted into gas internal energy; when the pressure fluctuation on the driving motor 1 is lower than the internal pressure of the accumulator, the oil in the accumulator flows to the external system under the action of high-pressure gas to release energy, wherein the gas accumulator can be divided into a pipeline absorber, a gas-liquid direct contact type, a piston type accumulator, a diaphragm type accumulator, an air bag type accumulator and the like according to the structure. And the spring type energy accumulator, the piston type energy accumulator and the gas type energy accumulator can be applied to a hydraulic system for pressure buffering, and the energy accumulator is more flexible to select and use.

The embodiment of the utility model provides an embodiment still provides a fracturing truck, including fracturing pump 2 and the above-mentioned embodiment hydraulic buffer, among the hydraulic buffer drive motor 1 with 2 drives of fracturing pump are connected, be equipped with the oil inlet on driving motor 1, install oil feed connecting piece 4 on the oil inlet, and the first end and the oil inlet intercommunication of oil feed connecting piece 4, the second end of oil feed connecting piece 4 with energy storage buffer structure 3 intercommunication among the hydraulic buffer, the third end of oil feed connecting piece 4 passes through high pressure fuel pipe and fracturing pump 2 intercommunication to make driving motor 1 constitute closed oil circuit through high pressure fuel pipe and fracturing pump 2, the beneficial effect of fracturing truck with hydraulic buffer's beneficial effect, no longer give unnecessary details here.

In an embodiment of the present invention, the fracturing pump 2 includes a mounting frame 21, a pump crankshaft and a transmission gear, wherein a receiving cavity is arranged inside the mounting frame 21, the transmission gear is embedded in the receiving cavity, and the pump crankshaft is inserted into the mounting frame 21 and is in transmission connection with the transmission gear;

the number of the driving motors 1 is multiple, each driving motor 1 includes a motor body and a driving gear, the multiple motor bodies are circumferentially arranged and penetrate through the outer side wall of the mounting frame 21, each motor body is in driving connection with each driving gear, each driving gear is circumferentially arranged in the outer circumferential direction of the transmission gear, and each driving gear is in meshing connection with the transmission gear.

It should be noted that the fracturing pump 2 includes an installation frame 21, a pump crankshaft (not shown in the figure) and a transmission gear (not shown in the figure), the installation frame 21 is a shell structure with an accommodating cavity inside, the transmission gear is embedded in the accommodating cavity in the installation frame 21, the pump crankshaft vertically penetrates through the installation frame 21 and is in transmission connection with the transmission gear, so that the pump crankshaft and the transmission gear are installed on the installation frame 21, and the installation frame 21 provides a supporting function for the transmission gear and the pump crankshaft; the center of the transmission gear is provided with a through hole, the pump crankshaft penetrates through the through hole, and the pump crankshaft is meshed with or in key connection with the through hole of the transmission gear, namely, the connection mode of the transmission gear and the pump crankshaft is not specifically limited; because the fluid load of the fracturing pump 2 is large, the fracturing pump 2 is driven by a plurality of driving motors 1 together, namely the driving motors 1 are arranged on the mounting frame 21 in a circumferential manner, external teeth are arranged on the circumferential outer wall of the transmission gear, the movable end of the driving motor 1 is meshed with the external teeth of the transmission gear, and the driving motors 1 work simultaneously to drive the transmission gear of the fracturing pump 2 to rotate, so that the transmission gear drives the pump crankshaft to rotate; the driving motor 1 comprises a motor body and driving gears, the driving gears in each driving motor 1 are arranged in a circle and are respectively meshed with external teeth of the transmission gear, the driving gears are all positioned between the transmission gear and the inner side wall of the mounting frame 21, the driving motor 1 is mounted on the outer side of the mounting frame 21, and a motor shaft of the driving motor 1 penetrates into the mounting frame 21 to be in driving connection with the driving gears; when the driving motor 1 drives the fracturing pump 2 to work, the plurality of motor bodies work to drive the driving gears to rotate, and the driving gears are respectively meshed with the transmission gears of the fracturing pump 2, so that the plurality of driving gears drive the transmission gears to rotate together, and the transmission gears drive the pump crankshaft of the fracturing pump 2 to rotate; the synchronous work of the motor bodies in the driving motors 1 drives the fracturing pump to rotate together, and therefore the fracturing pump 2 is guaranteed to be more stable in driving large fluid load.

In the embodiment, the motor body of the driving motor 1 may be mounted on the mounting frame 21 of the fracturing pump 2 through bolts, or may be mounted on the outer side wall of the mounting frame 21 through welding; the teeth of the driving gear are matched with those of the transmission gear, namely when the transmission gear is a spur gear, the driving gear is also a spur gear, and when the transmission gear is a helical gear, the driving gear is also a helical gear.

In an embodiment of the present invention, as shown in fig. 2, the fracturing pump 2 further includes a plurality of sealing structures 22, a plurality of mounting holes 211 are formed in the mounting frame 21, the plurality of sealing structures 22 are respectively disposed on the plurality of mounting holes 211, and the plurality of motor bodies are respectively disposed through the plurality of sealing structures 22.

It should be noted that, a plurality of mounting holes 211 arranged circumferentially are provided on the mounting bracket 21, a sealing structure 22 is installed at each mounting hole 211, and each motor body is installed on each sealing structure 22 in a subsection manner, that is, each motor body is installed at each mounting hole 211 on the mounting bracket 21 through each sealing structure 22, so as to ensure the sealing property of the connection between the motor body and the mounting bracket 21 and prevent impurities or oil leakage between the motor body and the mounting bracket 21; the sealing structure 22 may be a sealing ring or a sealing flange, wherein, when the sealing structure 22 is a sealing ring, the sealing ring may be installed in the installation hole 211 of the installation frame 21 by bolts or glue, and when the sealing structure 22 is a sealing flange, the sealing flange may be fixedly installed in the installation hole 211 of the installation frame 21 by bolts or welding, so as to enhance the connection firmness between the motor body and the installation frame 21.

In an embodiment of the present invention, referring to fig. 1, the mounting frame 21 is a hollow disc structure, the plurality of driving motors 1 are divided into two groups, two groups of driving motors 1 are respectively disposed on two side walls of the disc structure, and two groups of driving motors 1 are respectively in driving connection with the fracturing pump 2 for jointly driving the fracturing pump 2; the driving motors 1 in each group are arranged on the side wall of the disc structure in a circumferential manner.

It should be noted that the mounting frame 21 is a hollow disc structure, the two groups of driving motors 1 are respectively mounted on two side walls of the disc structure, and the driving motors 1 in each group are circumferentially arranged on the disc structure, so that the disc structure can be fully utilized, and the utilization rate of the two side walls of the mounting frame 21 which is the disc structure is improved; the fracturing pump 2 is driven by two groups of driving motors 1 together, so that the fracturing pump 2 is driven stably; the drive gear of fracturing pump 2 installs in disc structure's inside, the pump crankshaft wears to locate disc structure and is connected with the drive gear transmission, the drive end in each driving motor 1 in every group is motor body promptly and is connected with fracturing pump 2's drive gear meshing respectively, the circumference of the range circumference of a plurality of driving motors 1 and the circumference external tooth phase-match of the drive gear in the mounting bracket 21 promptly, each driving motor 1 is the circumference range and installs on the lateral wall of mounting bracket 21 for disc structure in every group, not only realize the neat installation of each driving motor 1, and make each driving motor 1's of disc structure's side wall mounting each mounted position atress balance, prevent that mounting bracket 21 from warping.

When the material pressing pump is a five-cylinder plunger pump and the number of the driving motors 1 is twelve, the driving motors 1 can be divided into two groups of driving motors 1 with the same number; when the quantity of driving motor 1 evenly divided into two sets ofly, six driving motor 1 of installation respectively on the both sides wall of mounting bracket 21, the benefit that sets up like this lies in, not only makes the driving motor 1 factor quantity of mounting bracket 21 both sides balanced and balanced just pleasing to the eye in fracturing pump 2, but also avoids mounting bracket 21 to warp because of one side driving motor 1 is in large quantity, and then guarantees mounting bracket 21's life.

Wherein, when mounting bracket 21 both sides actuating motor 1 quantity is the same, every motor body is connected with the driving motor drive that corresponds in the six actuating motor 1 of mounting bracket 21 every side installation, and two sets of twelve drive gears of total are the equidistant range of circumference and set up on drive gear this moment, and twelve drive gears are connected with drive gear meshing respectively to guarantee that fracturing pump 2's drive gear's circumference external tooth atress is balanced, rotate more steadily with guaranteeing drive gear. As another example, six motor bodies are respectively installed on two outer side walls of the installation frame 21, each group of motor bodies respectively installed on two side walls of the installation frame 21 is symmetrical, six driving gears are arranged on the outer circumferential direction of each driving gear, at the moment, the motor bodies oppositely arranged on the two side walls of the installation frame 21 share one driving gear, the arrangement is beneficial to the fact that the motor bodies oppositely arranged on the two side walls of the installation frame 21 jointly drive the corresponding driving gears to rotate, at the moment, the six driving gears jointly rotate to drive the driving gears to rotate, therefore, the driving gears are jointly driven to rotate through the two motor bodies, further, the rotating force of the driving gears and the driving gears can be increased, and the stable rotation of.

In this embodiment, when the number of the driving motors 1 is twelve, the driving motors 1 may also be divided into two groups of driving motors 1 with uneven number, for example, four driving motors 1 are installed on one side wall of the mounting frame 21, eight driving motors 1 are installed on the other side wall of the mounting frame 21, and the eight driving motors 1 are close to the fluid load, and twelve driving motors 1 are respectively installed with the energy storage buffer structure 3 through the oil inlet connector 4, so that when the fluid load fluctuates in the fracturing pump 2 caused during the pumping-in or discharging operation, a part of the fluctuations can be absorbed by the energy storage buffer structure 3 of the eight driving motors 1 on one side wall of the mounting frame 21, and the rest of the fluctuations are absorbed by the energy storage buffer structure 3 of the four driving motors 1 installed on the other side wall of the mounting frame 21, and then different numbers of driving motors 1 and corresponding energy storage buffer structures 3 are installed on two side walls of the mounting frame, the pressure fluctuation of the fracturing pump 2 is absorbed in batches, so that the pressure fluctuation of the fracturing pump 2 is prevented from being transmitted to a hydraulic system pipeline of the fracturing truck, damage to the hydraulic system pipeline is reduced, and the service lives of the hydraulic system and the fracturing truck are prolonged correspondingly.

In the above embodiment, when the fracturing pump 2 is a five-cylinder plunger pump, the number of the driving motors 1 may also be ten, eight, six or other numbers, and the number of the driving motors 1 is determined according to the fluid load of the fracturing pump 2, so the number of the driving motors 1 is not limited herein; of course, the material pressing pump may also be a plunger pump with other cylinders, such as a three-cylinder plunger pump, a four-cylinder plunger pump, a six-cylinder plunger pump or a seven-cylinder plunger pump, and the number of the driving motors 1 is also adaptively adjusted according to the load.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.

Claims (10)

1. The utility model provides a hydraulic buffer, is applied to the fracturing truck, the fracturing truck includes fracturing pump (2), a serial communication port, hydraulic buffer includes driving motor (1), oil feed connecting piece (4) and energy storage buffer structure (3), driving motor (1) with fracturing pump (2) drive is connected, be equipped with the oil inlet on driving motor (1), the first end of oil feed connecting piece (4) with the oil inlet intercommunication, the second end of oil feed connecting piece (4) with energy storage buffer structure (3) intercommunication, energy storage buffer structure (3) are suitable for the absorption fracturing pump (2) feed back pressure fluctuation on driving motor (1), the third end of oil feed connecting piece (4) with fracturing pump (2) intercommunication.

2. The hydraulic buffering device as claimed in claim 1, wherein the oil inlet connection (4) is a three-way valve block, a three-way solenoid valve or a three-way pipe.

3. The hydraulic buffering device as claimed in claim 1, characterized in that the number of the driving motors (1) is multiple, and the number of the oil inlet connectors (4) and the energy storage buffering structures (3) is matched with the number of the driving motors (1), and each oil inlet connector (4) installed on each driving motor (1) is respectively suitable for being connected with each energy storage buffering structure (3); the driving motors (1) are respectively in driving connection with the fracturing pump (2), and the driving motors (1) are suitable for driving the fracturing pump (2) together.

4. A hydraulic damping arrangement according to claim 2, characterised in that the mounting location of the charging damping structure (3) is adjacent to the drive motor (1).

5. A hydraulic damping arrangement according to any one of claims 1-4, characterised in that the energy accumulating and damping structure (3) is an energy accumulator which communicates with the second end of the oil feed connection (4).

6. The hydraulic damping device according to claim 5, characterized in that the accumulator is any one of a spring accumulator, a piston accumulator and a gas accumulator.

7. A fracturing truck, characterized by comprising a fracturing pump (2) and the hydraulic buffer device as claimed in any one of claims 1 to 6, wherein a driving motor (1) in the hydraulic buffer device is in driving connection with the fracturing pump (2), an oil inlet is formed in the driving motor (1), and an energy storage buffer structure (3) in the hydraulic buffer device is communicated with the oil inlet.

8. The fracturing truck of claim 7, wherein the fracturing pump (2) comprises a mounting frame (21), a pump crankshaft and a transmission gear, an accommodating cavity is formed in the mounting frame (21), the transmission gear is embedded in the accommodating cavity, and the pump crankshaft penetrates through the mounting frame (21) and is in transmission connection with the transmission gear;

the number of the driving motors (1) is multiple, each driving motor (1) comprises a motor body and a driving gear, the motor bodies are arranged on the outer side wall of the mounting frame (21) in a circumferential mode and penetrate through the outer side wall, each motor body is in driving connection with each driving gear, each driving gear is arranged on the outer periphery of each driving gear in a circumferential mode, and each driving gear is in meshing connection with each driving gear.

9. The fracturing truck of claim 8, wherein the fracturing pump (2) further comprises a plurality of sealing structures (22), a plurality of mounting holes (211) are formed in the mounting frame (21) in a circumferential arrangement, each sealing structure (22) is respectively arranged on each mounting hole (211), and each motor body is respectively arranged on each sealing structure (22) in a penetrating manner.

10. The fracturing truck of claim 8, wherein the mounting frame (21) is a hollow disc structure, the plurality of driving motors (1) are divided into two groups, the two groups of driving motors (1) are respectively arranged on two side walls of the disc structure, and the two groups of driving motors (1) are respectively in driving connection with the fracturing pump (2) for jointly driving the fracturing pump (2); the driving motors (1) in each group are arranged on the side wall of the disc structure in a circumferential manner.

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