CN111101916A

CN111101916A - Fracturing pump and fracturing pump set

Info

Publication number: CN111101916A
Application number: CN201911323996.9A
Authority: CN
Inventors: 张玉国; 周成香
Original assignee: Sichuan Honghua Electric Co ltd
Current assignee: Sichuan Honghua Electric Co ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-05-05

Abstract

The invention discloses a fracturing pump and a fracturing pump set. The fracturing pump comprises a cylinder body, a screw and a first sealing element, wherein a sealing space is arranged in the cylinder body, the screw is at least partially rotatably arranged in the sealing space and is provided with a spiral groove, a fluid inlet and a fluid outlet are formed in the cylinder body, the fluid inlet is communicated with one end of the spiral groove, the fluid outlet is communicated with the other end of the spiral groove, and the first sealing element is sleeved outside the spiral groove to form a fluid conveying channel with the spiral groove. The fracturing pump has the advantages of small impact load, low noise and no need of a cooling system, and is favorable for reducing the use cost.

Description

Fracturing pump and fracturing pump set

Technical Field

The invention relates to the technical field of fracturing pumps, in particular to a fracturing pump and a fracturing pump set.

Background

The mud pump in the petroleum drilling engineering comprises a double-cylinder double-acting mud pump, a three-cylinder single-acting mud pump and a plunger type fracturing pump. The double-cylinder double-acting slurry pump has the working principle that a piston reciprocates, and liquid is fed from the rear end of the double-cylinder double-acting slurry pump while liquid is discharged from the front end of the double-cylinder double-acting slurry pump; the working principle of the three-cylinder single-action slurry pump is that the piston reciprocates, and the liquid is discharged when the piston moves forwards and is fed when the piston moves backwards. The working principle of the ram fracturing pump is that the ram reciprocates to produce a high pressure fluid fracturing fluid. The double-cylinder double-acting mud pump, the three-cylinder single-acting mud pump and the plunger type fracturing pump are all intermittent energy conversion working machines (converting mechanical energy into liquid energy), along with discovery and development of shale gas energy in geological deposits, the optimization of the existing reciprocating intermittent energy conversion working machine has reached the limit, the quantity, the weight and the energy conversion efficiency of the working machines are difficult to meet the requirement of continuous optimization of the economic efficiency of the construction of the world engineering, and are seriously limited by the geological position of the geological deposits, and the reciprocating intermittent energy conversion working machines are easy to vibrate due to discontinuous output fluid, so that the service life of the energy conversion working machines is influenced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a fracturing pump and a fracturing pump set which are compact in structure, small in impact load, low in noise and long in service life.

The purpose of the invention is realized by the following technical scheme: a fracturing pump comprises a cylinder body, a screw and a first sealing element, wherein a sealing space is arranged in the cylinder body, the screw is at least partially rotatably arranged in the sealing space and is provided with a spiral groove, a fluid inlet and a fluid outlet are formed in the cylinder body, the fluid inlet is communicated with one end of the spiral groove, the fluid outlet is communicated with the other end of the spiral groove, and the first sealing element is sleeved outside the spiral groove to form a fluid conveying channel with the spiral groove.

Optionally, the first sealing element includes a plurality of coaxial and closely abutting sealing rings, and at least a part of the sealing rings are made of different materials.

Optionally, the fracturing pump is still including setting firmly in the import is filled up and export is filled up, at least part of screw rod rotationally locates import is filled up with in the export is filled up, a plurality of sealing washer location are in import is filled up with between the export is filled up.

Optionally, the export is filled up with between the first sealing member and import is filled up with between the first sealing member one of them is provided with the bellying, import is filled up with between the first sealing member and export is filled up with between the first sealing member another one of them is provided with this bellying complex depressed part, with through the bellying will at least part of first sealing member compress tightly in the depressed part.

Optionally, a plurality of sealing spaces are arranged in the cylinder body, each sealing space is internally provided with the screw, a first transfer space and a second transfer space which are independent of each other are further arranged in the cylinder body, the plurality of sealing spaces are uniformly distributed around the circumferential direction of the first transfer space and the circumferential direction of the second transfer space, the first transfer space is communicated with the fluid inlet and one ends of the plurality of spiral grooves, and the second transfer space is communicated with the fluid outlet and the other ends of the plurality of spiral grooves.

Optionally, the cylinder body is provided with a first fluid hole respectively communicating the first transfer space and the sealed space, and a second fluid hole respectively communicating the second transfer space and the sealed space, the first fluid hole corresponds to the fluid inlet, and the second fluid hole corresponds to the fluid outlet.

Optionally, the fracturing pump still includes inlet end cover, outlet end cover and second sealing member, inlet end cover fixed connection be in the one end of cylinder body, outlet end cover fixed connection be in the other end of cylinder body, the screw rod passes inlet end cover and stretch into in the cylinder body, the second sealing member cover is established and is located in the inlet end cover on the screw rod.

Optionally, the fracturing pump still includes fluid input pipe, fluid output pipe and check valve, the check valve includes first check valve and second check valve, the quantity of fluid input pipe and fluid output pipe all includes at least two, and every be provided with in the fluid input pipe and allow the fluid to get into the cylinder body first check valve, every be provided with in the fluid output pipe and allow the fluid to follow discharge in the cylinder body second check valve, at least two fluid input pipe evenly distributed is in on the cylinder body and with fluid inlet intercommunication, at least two fluid output pipe evenly distributed is in on the cylinder body and with fluid outlet intercommunication.

The invention also provides a fracturing pump set which comprises a speed reducer and the fracturing pump, wherein the output end of the speed reducer is connected with the screw rod to drive the screw rod to rotate;

the reduction gear includes box, sun gear, a plurality of planet wheel, driving shaft and many driven shafts, the driving shaft at least part rotation install in the box, sun gear install in on the driving shaft and be located in the box, many driven shafts at least part rotation install in the box and follow the circumference of driving shaft distributes, all installs on every driven shaft the planet wheel, every planet wheel all with the sun gear meshing, the driven shaft with the screw rod transmission is connected.

Optionally, the fracturing pump unit further comprises a base, the base comprises a bottom plate, a supporting plate and a positioning piece, the supporting plate is rotatably arranged on the bottom plate, the positioning piece is used for locking the supporting plate on the bottom plate, the supporting plate is vertically arranged on one side, far away from the bottom plate, of the supporting plate, and the supporting plate is supported on the fracturing pump.

The invention has at least the following advantages:

the fracturing pump disclosed by the invention has the advantages that the continuous and high-speed fluid conveying is realized through the continuous rotation of the screw, the impact load is small, the noise is low, the use cost is favorably reduced, and the service life is prolonged. In addition, compared with the existing plunger type fracturing pump, because the fluid is continuously output through the fracturing pump, the heat generated in the rotation process of the screw can be taken away by the fluid, and therefore, a cooling system does not need to be arranged aiming at the fracturing pump, the manufacturing cost of the fracturing pump can be reduced, and the structure of the fracturing pump is more compact and reasonable.

Drawings

Fig. 1 is a schematic structural view of a fracturing pump set provided by an exemplary embodiment of the present invention;

fig. 2 is a partial structural schematic diagram of a base and a fracturing pump provided in an exemplary embodiment of the invention;

FIG. 2a is a schematic view of a plurality of seal rings compressed between a pressure ring and a seat ring in accordance with an exemplary embodiment of the present invention;

FIG. 3 is a schematic structural view of a cylinder block provided in an exemplary embodiment of the present invention;

FIG. 4 is a schematic diagram of a first seal and outlet pillow cover configuration provided by an exemplary embodiment of the present invention;

FIG. 5 is a schematic structural view of a screw provided in an exemplary embodiment of the present invention;

fig. 6 is a schematic structural diagram of a fracturing pump and a base provided in an exemplary embodiment of the present invention;

FIG. 7 is a schematic view of the structure of FIG. 6 from another perspective;

fig. 8 is a schematic position diagram of a first fluid hole, a first relay space and a sealed space, or a schematic position diagram of a second fluid hole, a second relay space and a sealed space, provided by an exemplary embodiment of the present invention;

FIG. 9 is a partial cross-sectional view of a retarder provided in accordance with an exemplary embodiment of the present invention;

FIG. 10 is a schematic diagram of the construction of the driven shaft and planet provided by an exemplary embodiment of the present invention;

FIG. 11 is a schematic diagram of the configuration of the drive shaft and sun gear provided in an exemplary embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a base provided in an exemplary embodiment of the present invention;

in the figure, 10-cylinder; 11-a sealed space; 12-a fluid inlet; 13-a fluid outlet; 14-first transit space/second transit space; 15-first/second fluid aperture; 20-a screw; 21-a first connection; 22-an internal threaded hole; 31-inlet cushion cover; 32-outlet cushion cover; 321-opening holes; 40-a first seal; 41-pressing ring; 411-a boss; 42-a seat ring; 421-a recess; 50-inlet end cap; 60-outlet end cap; 70-a second seal; 80-a fluid input tube; 81-a first one-way valve; 90-a fluid outlet pipe; 91-a second one-way valve; 911-guide sleeve; 912-a spring; 913-a ball plunger; 100-a base plate; 101-a support plate; 102-a supporting plate; 1021-a groove; 103-a positioning element; 104-a guide block; 110-a box body; 111-drive shaft; 112-sun gear; 121-a driven shaft; 122-planet wheel; 123-a second connection; 130-coupling sleeve.

Detailed Description

The invention will be further described with reference to the accompanying drawings, without limiting the scope of the invention to the following:

according to a first aspect of the present invention, there is provided a fracturing pump, referring to fig. 1-12, comprising a cylinder 10, a screw 20 and a first seal 40.

The cylinder body 10 is provided with a sealed space 11, the screw 20 is at least partially rotatably installed in the sealed space 11, the screw 20 is provided with a spiral groove, the cylinder body 10 is provided with a fluid inlet 12 and a fluid outlet 13, the fluid inlet 12 is communicated with one end of the spiral groove, the fluid outlet 13 is communicated with the other end of the spiral groove, and the first sealing element 40 is sleeved outside the spiral groove to form a fluid conveying channel with the spiral groove.

In the embodiment of the present invention, when the screw 20 is rotated at a high speed by the external driving mechanism and the fluid is introduced into the spiral groove through the fluid inlet 12, the fluid is continuously pushed by the spiral groove, thereby forming a high-speed fluid and being discharged through the fluid outlet 13.

The existing plunger type fracturing pump adopts an intermittent energy conversion mode (output conversion from mechanical energy to hydraulic energy), the impact load is large, the noise is high, and the use cost is high. In addition, compared with the existing plunger type fracturing pump, because the fluid is continuously output through the fracturing pump, and heat generated in the rotation process of the screw 20 can be taken away by the fluid, a cooling system does not need to be arranged for the fracturing pump in the embodiment of the invention, so that the manufacturing cost of the fracturing pump can be reduced, and the structure of the fracturing pump is more compact and reasonable.

It should be noted that the fluid in the embodiments of the present invention may be a water-based acidified sanding liquid. For example, the water-based fluid can be mixed with quartz sand, hydrochloric acid and the like in proportion.

To match the installation of the screw 20, the enclosure 11 may be provided as a hollow cylindrical structure, and the axis of the screw 20 may be collinear with the axis of the enclosure 11.

In this embodiment, the first sealing member 40 includes a plurality of coaxial and tightly abutted sealing rings, that is, the number of the sealing rings is plural, and two adjacent sealing rings are tightly abutted together, in this case, the fluid conveying channel is formed between the spiral groove and the plurality of sealing rings, and since two adjacent sealing rings are tightly abutted together (that is, there is no gap between the two sealing rings), the fluid can be prevented from overflowing between the two sealing rings, so that the fluid can be continuously pushed from one end of the spiral groove to the other end at a high speed. Moreover, at least some of the sealing rings are made of different materials, in other words, the plurality of sealing rings are made of different materials, because the fluid in the embodiment of the present invention contains sand, if the plurality of sealing rings are made of the same material, for example, when the plurality of sealing rings are made of elastic materials, it is difficult to satisfy the impact of the sand-added fluid, and when the plurality of sealing rings are made of hard sealing rings, it is difficult to recover the deformation under the impact of the sand-added fluid, and the permanent deformation is easily caused, so the plurality of sealing rings made of different materials are beneficial to bearing pressure and prolonging the deformation period of the first sealing member 40.

In embodiments of the present invention, the plurality of seal rings may be constructed of any suitable material, for example, the plurality of seal rings may include tin bronze seal rings, plastic seal rings, fluorine fiber cloth seal rings, and nitride ceramic seal rings.

In other embodiments, the first seal 40 may be integrally formed of a plurality of materials, for example, a relatively hard material may be provided inside the first seal 40, and a soft material may be provided outside the first seal 40.

Referring to fig. 2, in the embodiment of the present invention, the fracturing pump further includes an inlet packing 31 and an outlet packing 32 fixedly disposed in the sealed space 11, at least a portion of the screw 20 is rotatably disposed in the inlet packing 31 and the outlet packing 32, and a plurality of sealing rings are positioned between the inlet packing 31 and the outlet packing 32, wherein the inlet packing 31 and the outlet packing 32 may be fixed in the sealed space 11 by a screw connection, for example, the inlet packing 31 and the outlet packing 32 may be stably fixed in the cylinder 10 by T-shaped threads. Since the positions of the inlet and outlet packing 31 and 32 are fixed in the cylinder body 10, the plurality of sealing rings can be tightly positioned between the inlet and outlet packing 31 and 32 by the inlet and

outlet packing

31 and 32, ensuring that no gap is generated between the plurality of sealing rings.

Referring to fig. 2, further, in order to tightly abut the plurality of seal rings together, one of the outlet cushion cover 31 and the first seal member 40 and the inlet cushion cover 32 and the first seal member 40 is provided with a convex portion, and the other of the inlet cushion cover 32 and the first seal member 40 and the outlet cushion cover 31 and the first seal member 40 is provided with a concave portion engaged with the convex portion, so as to press at least a part of the first seal member 40 into the concave portion by the convex portion, for convenience of processing, the convex portion may be provided at an end surface of the outlet cushion cover 32 facing the first seal member 40, the concave portion may be provided at an end surface of the inlet cushion cover 31 facing the first seal member 40, and in addition, the concave portion may be provided at an end surface of the outlet cushion cover 32 facing the first seal member 40, and the convex portion may be provided at an end surface of the inlet cushion cover 31 facing the first seal member 40, that is, the protrusions may be integrally formed on the end surface of the outlet cushion cover 31 or the inlet cushion cover 32, and the depressions may be integrally formed on the end surface of the inlet cushion cover 32 or the outlet cushion cover 31. The convex parts and the concave parts extend along the radial direction of the outlet cushion cover 32 or the inlet cushion cover 31, namely, the convex parts and the concave parts are distributed on the end surface of the outlet cushion cover 32 or the inlet cushion cover 31 in a circular ring shape.

Specifically, in order to simplify the processing difficulty, referring to fig. 2a, the fracturing pump may further include a seat ring 42 and a pressing ring 41, the seat ring 42 and the pressing ring 41 are both sleeved on the circumference of the screw 20, and the seat ring 42 may be disposed between the outlet cushion cover 32 and the first sealing member 40 or between the inlet cushion cover 31 and the first sealing member 40, and accordingly, the pressing ring 41 may be disposed between the inlet cushion cover 31 and the first sealing member 40 or between the outlet cushion cover 32 and the first sealing member 40, that is, the pressing ring 41 and the seat ring 42 are correspondingly distributed at both ends of the first sealing member 40, wherein an end surface of the pressing ring 41 near the first sealing member 40 is provided with a protrusion 411, an end surface of the seat ring 42 near the first sealing member 40 is provided with a recess 421 matching with the protrusion 411, that is, the protrusion 411 may be integrally formed on an end surface of the pressing ring 41 or the seat ring 42, the recess 421 may be integrally formed on an end surface of the seat ring 42 or the pressing ring 41, the contact between the plurality of seal rings can be made tighter by pressing the pressing ring 41 and the seat ring 42 against each other, that is, by pressing the first seal member 40 into the recess 421 via the protrusion 411. Wherein the convex portion 411 and the concave portion 421 may be configured in any suitable structure, for example, the screw 20 may be sectioned along a vertical section extending in the axial direction of the screw 20, the shape of the convex portion 411 may be triangular, and correspondingly, the concave portion 421 may be a triangular groove; in addition, the convex portions and the concave portions may also be trapezoidal.

Referring to fig. 2, 3 and 8, a plurality of sealing spaces 11 are provided in the cylinder 10, each sealing space 11 is provided with a screw 20, that is, the number of the sealing spaces 11, the screws 20 and the first sealing members 40 is the same, in order to improve the fluid conveying efficiency, the sealing spaces 11 may be provided with three, four, five or more, a first intermediate transfer space 14 and a second intermediate transfer space 14 which are independent from each other are further provided in the cylinder 10, where independent means that the first intermediate transfer space 14 and the second intermediate transfer space 14 are spaced apart and not communicated with each other (or it is understood that a partition plate extending in a radial direction is provided in a middle portion of a cylindrical and hollow structure to divide the hollow structure into two spaces separated from each other), the first intermediate transfer space 14 and the second intermediate transfer space 14 may extend in an axial direction of the cylinder 10, the plurality of sealing spaces 11 are uniformly distributed around the circumferential directions of the first intermediate transfer space 14 and the second intermediate transfer space 14, the first relay space 14 is respectively communicated with the fluid inlet 12 and one end of the plurality of spiral grooves, the second relay space 14 is respectively communicated with the fluid outlet 13 and the other end of the plurality of spiral grooves, the fluid entering through the fluid inlet 12 can be conveyed to one end of the plurality of spiral grooves through the first relay space 14, and the fluid discharged through the other end of the plurality of spiral grooves can be guided to the fluid outlet 13 through the second relay space 14, which is favorable for the compact arrangement of the cylinder body 10 and the improvement of the conveying efficiency of the fluid. The plurality of screws 20 and the sealing space 11 are arranged, so that the displacement of the fracturing pump is increased, and the pressure of fluid is increased.

It should be noted that, referring to fig. 2 and 4, the inlet cushion cover 31 and the outlet cushion cover 32 are configured into a hollow cylindrical structure with two ends penetrating, and are provided with a plurality of openings 321, and the openings 321 are uniformly distributed along the circumferential direction of the inlet cushion cover 31 and the outlet cushion cover 32, so that the fluid enters one end of the spiral groove via the sealed space 11 and enters the sealed space 11 via the other end of the spiral groove.

Further, referring to fig. 3 and 8, a first fluid hole 15 communicating with the first intermediate space 14 and the sealed space 11 and a second fluid hole 15 communicating with the second intermediate space 14 and the sealed space 11 are opened on the cylinder 10, that is, the first intermediate space 14 and the second intermediate space 14 are originally spaced apart from the sealed space 11, the first intermediate space 14 is communicated with the sealed space 11 and the second intermediate space 14 is communicated with the sealed space 11 under the action of the first fluid hole 15 and the second fluid hole 15, wherein the axis of the first fluid hole 15 is perpendicular to the first intermediate space 14 and the sealed space 11 (or the first fluid hole 15 extends along the radial direction of the cylinder 10), and the axis of the second fluid hole 15 is perpendicular to the second intermediate space 14 and the sealed space 11, so as to shorten the time for the fluid to enter the sealed space 11 corresponding to the inlet 31 from the first intermediate space 14, and shorten the time for the fluid to enter the sealed space 11 corresponding to the inlet 31, And the time when the fluid enters the second transit space 14 from the sealed space 11 corresponding to the outlet mat cover 32. The first fluid hole 15 corresponds to the fluid inlet 12, that is, after entering the first intermediate space 14 through the fluid inlet 12 on the cylinder 10, the fluid enters the sealed space 11 corresponding to one end of the spiral groove through the first fluid hole 15, and the second fluid hole 15 corresponds to the fluid outlet 13, that is, the fluid enters the second intermediate space 14 through the sealed space 11 corresponding to the other end of the spiral groove and the second fluid hole 15, and then is discharged out of the cylinder 10 through the fluid outlet 13 on the cylinder 10.

Referring to fig. 2 and 5, the fracturing pump further includes an inlet end cover 50, an outlet end cover 60 and a second sealing element 70, the inlet end cover 50 is fixedly connected to one end of the cylinder body 10, the outlet end cover 60 is fixedly connected to the other end of the cylinder body 10, the screw 20 penetrates through the inlet end cover 50 and extends into the cylinder body 10, the second sealing element 70 is sleeved on the screw 20 located in the inlet end cover 50, and the second sealing element 70 is arranged to facilitate preventing the fluid from overflowing from the inlet end cover 50. The screw 20 and the second sealing element 70 are configured as a polish rod structure, and the second sealing element 70 may be configured as the first sealing element 40, that is, a plurality of sealing rings made of different materials are used, for example, a fluorine fiber cloth-sandwiched sealing ring, a nitride ceramic sealing ring, a plastic sealing ring, and a tin bronze sealing ring may be alternately arranged. In addition, the outlet end cover 60 is arranged, when the fracturing pump needs to be overhauled, the outlet end cover 60 is dismounted, and the internal parts of the fracturing pump can be maintained or replaced in time. To facilitate removal of the screw 20, an internally threaded hole 22 is provided at an end of the screw 20 (i.e., an end of the screw 20 corresponding to the outlet end cap 60) so that the screw 20 is pulled out after a rod having an external thread is engaged with the internally threaded hole 22 of the screw 20.

Referring to fig. 2, 6 and 7, optionally, the frac pump further includes a fluid input pipe 80, a fluid output pipe 90 and check valves, each check valve includes a first check valve 81 and a second check valve 91, the number of the fluid input pipe 80 and the fluid output pipe 90 includes at least two, each fluid input pipe 80 is provided with a first check valve 81 for allowing fluid to enter the cylinder 10, each fluid output pipe 90 is provided with a second check valve 91 for allowing fluid to be discharged from the cylinder 10, the second check valve 91 is beneficial to preventing fluid from flowing back into the cylinder 10, each of the first check valve 81 and the second check valve 91 may include a guide sleeve 911, a spring 912 and a ball plug 913, the fluid input pipe 80 and the fluid output pipe 90 may be located outside the cylinder 10 or at least partially located inside the cylinder 10, and the cylinder 10 is further provided with a third fluid hole for respectively communicating the first transfer space 14 and the fluid inlet 12, A fourth fluid hole respectively communicating the second intermediate space 14 and the fluid outlet 13, the first check valve 81 may be at least partially disposed in the third fluid hole, the second check valve 91 may be at least partially disposed in the fourth fluid hole, the guide sleeve 911 of the first check valve 81 is communicated with the fluid input tube 80, the spring 912 of the first check valve 81 is located between the guide sleeve 911 and the ball plunger 913, and the ball plunger 913 is located far from the first intermediate space 14 with respect to the guide sleeve 911, the guide sleeve 911 of the second check valve 91 is communicated with the fluid output tube 90, the spring 912 of the second check valve 91 is located between the guide sleeve 911 and the ball plunger 913, and the ball plunger 913 is located close to the second intermediate space 14 with respect to the guide sleeve 911.

The at least two fluid input pipes 80 are uniformly distributed on the cylinder body 10 and communicated with the fluid inlet 12, and the at least two fluid output pipes 90 are uniformly distributed on the cylinder body 10 and communicated with the fluid outlet 13, for example, when the number of the fluid input pipes 80 and the number of the fluid output pipes 90 are two, the two fluid input pipes 80 and the two fluid output pipes 90 can be symmetrically distributed relative to the axis of the first transfer space 14, and the fluid output pipes 90 can also be arranged in such a way, the output flow of the fracturing pump can be increased by arranging the two fluid input pipes 80 and the two fluid output pipes 90, and meanwhile, a user can select one of the fluid input pipe 80 and the fluid output pipe 90 according to the requirements of the site.

Referring to fig. 1, according to a second aspect of the invention, a fracturing pump set is provided, which comprises a reducer and the fracturing pump, wherein the output end of the reducer is connected with a screw rod 20 to drive the screw rod 20 to rotate. In the embodiment of the invention, the screw rod 20 of the fracturing pump is driven to rotate by the speed reducer, and different from a traditional fracturing pump transmission mechanism (crankshaft), the speed reducer is adopted to drive the screw rod 20 to rotate, so that the occupied space and the whole weight of the fracturing pump set are reduced, the manufacturing cost is reduced, the transportation and the installation of the fracturing pump set are facilitated, for example, the fracturing pump set can be transported in a vehicle-mounted or skid-mounted mode, and the fracturing pump set is not easily influenced by the geological position of the mineral deposit.

Referring to fig. 1, 9, 10 and 11, in particular, the reducer includes a case 110, a central gear 112, a plurality of planetary gears 122, a driving shaft 111 and a plurality of driven shafts 121, the driving shaft 111 is at least partially rotatably installed in the case 110, the driving shaft 111 can be connected to an external power source to be driven by the power source to rotate, the central gear 112 is installed on the driving shaft 111 and located in the case 110, the plurality of driven shafts 121 are at least partially rotatably installed in the case 110 and distributed along a circumferential direction of the driving shaft 111, that is, the plurality of driven shafts 121 are uniformly distributed along a circumferential direction of the driving shaft 111, each driven shaft 121 is installed with a planetary gear 122, each planetary gear 122 is engaged with the central gear 112, the driven shafts 121 are in transmission connection with screws 20, the number of the driven shafts 121 is equal to the number of screws 20, so that each driven. Therefore, when the driving shaft 111 rotates under the driving of the external power source, the driving shaft 111 can drive the planet gears 122 to rotate through the central gear 112, so that the driven shafts 121 rotate, and thus a plurality of driven shafts 121 can be driven to rotate simultaneously through the driving shaft 111.

Referring to fig. 1, 5 and 10, as an exemplary embodiment, one end of the screw rod 20 is provided with a first connecting portion 21, one end of the driven shaft 121 is provided with a second connecting portion 123, and both the first connecting portion 21 and the second connecting portion 123 may be configured as gears, so that the first connecting portion 21 and the second connecting portion 123 may be connected together by a coupling sleeve 130, so that the driven shaft 121 and the screw rod 20 are in transmission connection by the coupling sleeve 130.

Referring to fig. 1 and 12, further, the base includes a bottom plate 100, a support plate 101, a support plate 102, and a positioning member 103, the bottom plate 100 and the support plate 101 have various shapes, which may be circular, rectangular or other shapes, the support plate 101 is rotatably disposed on the bottom plate 100, the positioning member 103 is used to lock the support plate 101 on the bottom plate 100, for example, the support plate 101 may be locked with respect to the bottom plate 100 by bolts, the support plate 102 is vertically disposed on a side of the support plate 101 away from the bottom plate 100, the number of the support plates 102 may be two, and is oppositely disposed on the support plate 101, the support plate 102 is supported on the frac pump, and specifically, a groove 1021 matching the shape of the cylinder 10 may be disposed on the support plate 102, which may facilitate firmly fixing the cylinder 10 in the groove 1021 of the support plate. In addition, since the fracturing pump can rotate relative to the base plate 100, a worker can adjust the angle of the fracturing pump in the horizontal direction in order to detach the inlet end cover 50 and the outlet end cover 60.

Referring to fig. 12, additionally, a guide block 104 may be provided under the base plate 100 to facilitate movement of the fracturing pump stack.

As a specific embodiment of the present invention, a plurality of fracturing pumps may be connected in series to meet the requirements of higher pressure applications.

The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A fracturing pump, characterized by: the screw rod is at least partially rotatably installed in the sealed space and is provided with a spiral groove, a fluid inlet and a fluid outlet are formed in the cylinder body, the fluid inlet is communicated with one end of the spiral groove, the fluid outlet is communicated with the other end of the spiral groove, and the first sealing element is sleeved outside the spiral groove to form a fluid conveying channel with the spiral groove.

2. The fracturing pump of claim 1, wherein: the first sealing element comprises a plurality of coaxial and closely abutted sealing rings, and at least part of the sealing rings are made of different materials.

3. The frac pump of claim 2, wherein: the fracturing pump is still including setting firmly in the import of enclosure space is filled up and is filled up with the export, at least part of screw rod is rotationally located import fill up with in the export fill up, a plurality of sealing washer location are in import fill up with between the export fill up.

4. The fracturing pump of claim 3, wherein: the export is filled up with between the first sealing member and import is filled up with one of between the first sealing member is provided with the bellying, import fill up with between the first sealing member and export fill up with another one of between the first sealing member is provided with this bellying complex depressed part, with pass through the bellying will at least part of first sealing member compress tightly in the depressed part.

5. The fracturing pump of claim 1, wherein: the sealing structure is characterized in that a plurality of sealing spaces are arranged in the cylinder body, each sealing space is internally provided with the screw, a first transfer space and a second transfer space which are mutually independent are further arranged in the cylinder body, the sealing spaces are uniformly distributed around the first transfer space and the second transfer space in the circumferential direction, the first transfer space is communicated with the fluid inlet and one ends of the spiral grooves respectively, and the second transfer space is communicated with the fluid outlet and the other ends of the spiral grooves respectively.

6. The fracturing pump of claim 5, wherein: and the cylinder body is provided with a first fluid hole which is respectively communicated with the first transfer space and the sealed space and a second fluid hole which is respectively communicated with the second transfer space and the sealed space, the first fluid hole corresponds to the fluid inlet, and the second fluid hole corresponds to the fluid outlet.

7. The fracturing pump of claim 1, wherein: the fracturing pump further comprises an inlet end cover, an outlet end cover and a second sealing element, wherein the inlet end cover is fixedly connected with one end of the cylinder body, the outlet end cover is fixedly connected with the other end of the cylinder body, the screw rod penetrates through the inlet end cover and stretches into the cylinder body, and the second sealing element is sleeved on the screw rod positioned in the inlet end cover.

8. The fracturing pump of claim 1, wherein: the fracturing pump further comprises a fluid input pipe, a fluid output pipe and one-way valves, wherein each one-way valve comprises a first one-way valve and a second one-way valve, the number of the fluid input pipe and the number of the fluid output pipe comprise at least two, and each one-way valve allowing fluid to enter the cylinder body is arranged in the fluid input pipe, each one-way valve allowing fluid to be discharged from the cylinder body is arranged in the fluid output pipe, the number of the second one-way valves is at least two, the fluid input pipes are uniformly distributed on the cylinder body and communicated with the fluid inlet, and the number of the fluid output pipes is at least two, the fluid output pipes are uniformly distributed on the cylinder body and communicated with the fluid outlet.

9. A fracturing pump package characterized in that: the fracturing pump of any one of claims 1 to 8 and a speed reducer, wherein the output end of the speed reducer is connected with the screw to drive the screw to rotate;

10. The frac pump set of claim 9, wherein: the fracturing pump unit further comprises a base, the base comprises a bottom plate, a supporting plate and a positioning piece, the supporting plate is rotatably arranged on the bottom plate, the positioning piece is used for locking the supporting plate on the bottom plate, the supporting plate is vertically arranged on one side, far away from the bottom plate, of the supporting plate, and the supporting plate is supported on the fracturing pump.