Fracturing pumps and fracturing pump sets

Abstract

The present invention discloses a fracturing pump and a fracturing pump assembly. The fracturing pump comprises a cylinder body, a screw and a first sealing member, wherein a sealing space is arranged in the cylinder body, wherein the screw is at least partially rotatably installed in the sealing space, wherein the screw has a spiral groove, wherein a fluid inlet and a fluid outlet are arranged on the cylinder body, wherein the fluid inlet is connected to one end of the spiral groove, wherein the fluid outlet is connected to the other end of the spiral groove, and wherein the first sealing member is sleeved on the outside of the spiral groove to form a fluid conveying channel with the spiral groove. The fracturing pump has a small impact load, low noise, and does not require a cooling system, which is conducive to reducing the use cost.

Description

Technical Field

[0001] The present invention relates to the technical field of fracturing pumps, and in particular to a fracturing pump and a fracturing pump assembly. Background Art

[0002] Mud pumps used in oil drilling projects include double-cylinder double-acting mud pumps, triplex single-acting mud pumps and plunger-type fracturing pumps. The working principle of the double-cylinder double-acting mud pump is that the front end discharges liquid while the rear end is filled with liquid; the working principle of the triplex single-acting mud pump is that the piston reciprocates, discharging liquid when the piston moves forward and filling liquid when it moves backward. The working principle of the plunger-type fracturing pump is that the plunger reciprocates to generate high-pressure fluid fracturing fluid. Double-cylinder double-acting mud pumps, three-cylinder single-acting mud pumps and plunger fracturing pumps are all intermittent energy conversion machines (converting mechanical energy into liquid energy). With the discovery and development of shale gas energy in geological deposits, the optimization of existing reciprocating intermittent energy conversion machines has reached its limit. Their size, weight and energy conversion efficiency are difficult to meet the needs of continuous optimization of the economy of engineering construction in the world, and are seriously restricted by the geographical and geological location of the deposits. In addition, the reciprocating intermittent energy conversion machine is prone to vibration due to the discontinuous output of the fluid, which in turn affects the service life of the energy conversion machine. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a fracturing pump and a fracturing pump group with compact structure, small impact load, low noise and long service life.

[0004] The objective of the present invention is achieved through the following technical scheme: a fracturing pump, comprising a cylinder body, a screw and a first sealing member, wherein a sealing space is arranged in the cylinder body, wherein the screw is at least partially rotatably installed in the sealing space, wherein the screw has a spiral groove, wherein a fluid inlet and a fluid outlet are arranged on the cylinder body, wherein the fluid inlet is connected to one end of the spiral groove, and the fluid outlet is connected to the other end of the spiral groove, wherein the first sealing member is sleeved on the outside of the spiral groove to form a fluid delivery channel with the spiral groove.

[0005] Optionally, the first sealing member includes a plurality of coaxial and tightly abutting sealing rings, and at least some of the sealing rings are made of different materials.

[0006] Optionally, the fracturing pump further comprises an inlet gasket and an outlet gasket fixedly disposed in the sealing space, at least a portion of the screw is rotatably disposed in the inlet gasket and the outlet gasket, and the plurality of sealing rings are positioned between the inlet gasket and the outlet gasket.

[0007] Optionally, a protrusion is provided between one of the outlet gasket sleeve and the first seal and between the inlet gasket sleeve and the first seal, and a recessed portion matching the protrusion is provided between the inlet gasket sleeve and the first seal and between the outlet gasket sleeve and the first seal, so that at least a portion of the first seal can be pressed into the recessed portion through the protrusion.

[0008] Optionally, a plurality of sealed spaces are provided in the cylinder body, the screw is provided in each of the sealed spaces, and a first transfer space and a second transfer space which are independent of each other are also provided in the cylinder body, and the plurality of sealed spaces are evenly distributed around the circumference of the first transfer space and the second transfer space, the first transfer space is respectively connected to the fluid inlet and one end of the plurality of spiral grooves, and the second transfer space is respectively connected to the fluid outlet and the other end of the plurality of spiral grooves.

[0009] Optionally, the cylinder body is provided with a first fluid hole respectively connecting the first transfer space and the sealed space, and a second fluid hole respectively connecting 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.

[0010] Optionally, the fracturing pump further includes an inlet end cover, an outlet end cover and a second seal, wherein the inlet end cover is fixedly connected to one end of the cylinder body, the outlet end cover is fixedly connected to the other end of the cylinder body, the screw passes through the inlet end cover and extends into the cylinder body, and the second seal is sleeved on the screw located in the inlet end cover.

[0011] Optionally, the fracturing pump further includes a fluid input pipe, a fluid output pipe and a one-way valve, the one-way valve includes a first one-way valve and a second one-way valve, the number of the fluid input pipe and the fluid output pipe each includes at least two, and each of the fluid input pipes is provided with the first one-way valve allowing fluid to enter the cylinder body, and each of the fluid output pipes is provided with the second one-way valve allowing fluid to be discharged from the cylinder body, at least two of the fluid input pipes are evenly distributed on the cylinder body and connected to the fluid inlet, and at least two of the fluid output pipes are evenly distributed on the cylinder body and connected to the fluid outlet.

[0012] The present invention also provides a fracturing pump assembly, comprising a reducer and the above-mentioned fracturing pump, wherein the output end of the reducer is connected to the screw to drive the screw to rotate;

[0013] The reducer includes a housing, a central gear, a plurality of planetary gears, a driving shaft and a plurality of driven shafts. The driving shaft is at least partially rotatably mounted in the housing. The central gear is mounted on the driving shaft and is located in the housing. The plurality of driven shafts are at least partially rotatably mounted in the housing and are distributed along the circumference of the driving shaft. Each driven shaft is mounted with the planetary gear, each planetary gear is meshed with the central gear, and the driven shaft is connected to the screw driving rod.

[0014] Optionally, the fracturing pump group also includes a base, which includes a bottom plate, a support plate, a strut plate and a positioning piece. The support plate is rotatably arranged on the bottom plate, and the positioning piece is used to lock the support plate on the bottom plate. The strut plate is vertically arranged on a side of the support plate away from the bottom plate, and the strut plate is supported by the fracturing pump.

[0015] The present invention has at least the following advantages:

[0016] The fracturing pump disclosed in the present invention realizes continuous and high-speed delivery of fluid by continuous rotation of the screw, has a small impact load and low noise, and is conducive to reducing the use cost and extending the service life. In addition, compared with the existing plunger-type fracturing pump, since the fluid is continuously output through the fracturing pump, the heat generated during the rotation of the screw can be taken away by the fluid, so there is no need to set a cooling system for the fracturing pump, which can reduce the manufacturing cost of the fracturing pump and make its structure more compact and reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a fracturing pump group provided for an exemplary embodiment of the present invention;

[0018] Figure 2 A partial structural schematic diagram of a base and a fracturing pump provided for an exemplary embodiment of the present invention;

[0019] Figure 2a A schematic diagram of a state in which a plurality of sealing rings provided by an exemplary embodiment of the present invention are compressed between a pressing ring and a seat ring;

[0020] Figure 3 A schematic diagram of the structure of a cylinder provided for an exemplary embodiment of the present invention;

[0021] Figure 4 A schematic diagram of the structure of a first sealing member and an outlet gasket provided for an exemplary embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the structure of a screw provided for an exemplary embodiment of the present invention;

[0023] Figure 6 A schematic diagram of the structure of a fracturing pump and a base provided for an exemplary embodiment of the present invention;

[0024] Figure 7 for Figure 6 A structural diagram of another perspective;

[0025] Figure 8 A schematic diagram of the positions of the first fluid hole, the first transfer space and the sealing space, or a schematic diagram of the positions of the second fluid hole, the second transfer space and the sealing space provided in an exemplary embodiment of the present invention;

[0026] Fig. 9 A partial cross-sectional view of a reducer provided for an exemplary embodiment of the present invention;

[0027] Fig.10 A schematic diagram of the structure of a driven shaft and a planetary gear provided for an exemplary embodiment of the present invention;

[0028] Fig.11 A schematic diagram of the structure of a driving shaft and a central gear provided for an exemplary embodiment of the present invention;

[0029] Fig.12 A schematic structural diagram of a base provided for an exemplary embodiment of the present invention;

[0030] In the figure, 10-cylinder body; 11-sealed space; 12-fluid inlet; 13-fluid outlet; 14-first transfer space / second transfer space; 15-first fluid hole / second fluid hole; 20-screw; 21-first connecting part; 22-internal threaded hole; 31-inlet bushing; 32-outlet bushing; 321-opening; 40-first sealing member; 41-pressing ring; 411-protrusion; 42-seat ring; 421-recess; 50-inlet end cover; 60-outlet end cover; 70- The second sealing member; 80-fluid input pipe; 81-first one-way valve; 90-fluid output pipe; 91-second one-way valve; 911-guide sleeve; 912-spring; 913-ball plug; 100-base plate; 101-support plate; 102-support plate; 1021-groove; 103-positioning member; 104-guide block; 110-housing; 111-driving shaft; 112-central gear; 121-driven shaft; 122-planetary gear; 123-second connecting portion; 130-coupling sleeve. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings, and the protection scope of the present invention is not limited to the following:

[0032] According to a first aspect of the present invention, there is provided a fracturing pump, Figure 1-Figure 12 The fracturing pump includes a cylinder 10 , a screw 20 and a first sealing member 40 .

[0033] A sealed space 11 is provided in the cylinder body 10, and a screw 20 is at least partially rotatably installed in the sealed space 11. The screw 20 has a spiral groove. A fluid inlet 12 and a fluid outlet 13 are provided on the cylinder body 10. The fluid inlet 12 is connected to one end of the spiral groove, and the fluid outlet 13 is connected to the other end of the spiral groove. A first sealing member 40 is sleeved on the outside of the spiral groove to form a fluid delivery channel with the spiral groove.

[0034] In an embodiment of the present invention, when the screw 20 rotates at high speed under the action of an external driving mechanism and the fluid enters the spiral groove through the fluid inlet 12, the fluid is continuously pushed forward under the action of the spiral groove, thereby forming a high-speed fluid and being discharged through the fluid outlet 13.

[0035] The existing plunger-type fracturing pump adopts an intermittent energy conversion method (conversion of mechanical energy into liquid energy output), which has a large impact load, high noise, and high cost of use. The fracturing pump disclosed in the present invention realizes continuous and high-speed delivery of fluid by continuous rotation of the screw 20. Its small impact load makes the parts in the fracturing pump have a long service life and low noise, which is conducive to reducing the cost of use. For example, when carrying out engineering construction in certain blocks with high environmental index requirements, more engineering construction costs are required to meet the requirements of environmental indexes. In addition, compared with the existing plunger-type fracturing pump, since the fluid is continuously output through the fracturing pump, the heat generated during the rotation of the screw 20 can be taken away by the fluid. Therefore, in the embodiment of the present invention, there is no need to set a cooling system for the fracturing pump, which can reduce the manufacturing cost of the fracturing pump and make its structure more compact and reasonable.

[0036] It should be noted that the fluid in the embodiment of the present invention can be a water-based acidified sand-added liquid. For example, quartz sand, hydrochloric acid, etc. can be mixed into a water-based liquid in a certain proportion.

[0037] To match the installation of the screw rod 20 , the sealing space 11 may be configured as a hollow cylindrical structure, and the axis of the screw rod 20 may be colinear with the axis of the sealing space 11 .

[0038] In this embodiment, the first seal 40 includes a plurality of coaxial and tightly abutting seal rings, that is, the number of seal rings is multiple, and two adjacent seal rings are tightly abutted together. In this case, the fluid delivery channel is formed between the spiral groove and the plurality of seal rings. Since the two adjacent seal rings are tightly abutted together (i.e., there is no gap between the two seal rings), the fluid can be prevented from overflowing from between the two seal rings, so that the fluid can be continuously pushed from one end of the spiral groove to the other end at high speed. In addition, at least part of the seal rings are made of different materials. In other words, the materials of the plurality of seal rings are not the same. Since the fluid in the embodiment of the present invention contains sand, if the materials of the plurality of seal rings are the same, for example, when the materials of the plurality of seal rings are all elastic materials, it is difficult to meet the impact of the sand-added fluid. When the materials of the plurality of seal rings are all relatively hard seal rings, it is difficult to recover the deformation under the impact of the sand-added fluid, and it is easy to cause permanent deformation. Therefore, the plurality of seal rings of different materials are conducive to bearing pressure and extending the deformation cycle of the first seal 40.

[0039] In an embodiment of the present invention, the plurality of sealing rings may be made of any suitable material. For example, the plurality of sealing rings may include a tin bronze sealing ring, a plastic sealing ring, a fluorine fiber cloth sealing ring, and a nitride porcelain sealing ring.

[0040] In other embodiments, the first sealing member 40 may also be integrally formed of multiple materials. For example, a harder material is disposed inside the first sealing member 40 , and a softer material is disposed outside the first sealing member 40 .

[0041] Reference Figure 2 In the embodiment of the present invention, the fracturing pump further includes an inlet gasket 31 and an outlet gasket 32 ​​fixedly disposed in the sealing space 11, at least part of the screw 20 is rotatably disposed in the inlet gasket 31 and the outlet gasket 32, and a plurality of sealing rings are positioned between the inlet gasket 31 and the outlet gasket 32, wherein the inlet gasket 31 and the outlet gasket 32 ​​can be fixed in the sealing space 11 by threaded connection, for example, the inlet gasket 31 and the outlet gasket 32 ​​can be stably fixed in the cylinder body 10 by T-shaped threads. Since the positions of the inlet gasket 31 and the outlet gasket 32 ​​in the cylinder body 10 are fixed, the plurality of sealing rings can be tightly positioned between the inlet gasket 31 and the outlet gasket 32 ​​by the inlet gasket 31 and the outlet gasket 32, ensuring that no gaps are generated between the plurality of sealing rings.

[0042] Reference Figure 2Further, in order to make the multiple sealing rings tightly pressed together, a protrusion is provided between the outlet gasket 31 and the first seal 40 and between the inlet gasket 32 ​​and the first seal 40, and a recessed portion matching the protrusion is provided between the inlet gasket 32 ​​and the first seal 40 and between the outlet gasket 31 and the first seal 40, so that at least part of the first seal 40 is pressed into the recessed portion by the protrusion. In order to facilitate processing, the protrusion can be provided at the outlet. The end surface of the gasket sleeve 32 facing the first seal 40, the recessed portion can be arranged on the end surface of the inlet gasket sleeve 31 facing the first seal 40, and the recessed portion can also be arranged on the end surface of the outlet gasket sleeve 32 facing the first seal 40, and the raised portion can be arranged on the end surface of the inlet gasket sleeve 31 facing the first seal 40, that is, the raised portion can be integrally formed on the end surface of the outlet gasket sleeve 31 or the inlet gasket sleeve 32, and the recessed portion can be integrally formed on the end surface of the inlet gasket sleeve 32 or the outlet gasket sleeve 31. Among them, the raised portion and the recessed portion both extend along the radial direction of the outlet gasket sleeve 32 or the inlet gasket sleeve 31, that is, the raised portion and the recessed portion are distributed in a circular ring shape on the end surface of the outlet gasket sleeve 32 or the inlet gasket sleeve 31.

[0043] Specifically, in order to simplify the processing difficulty, refer to Figure 2a The fracturing pump may further include a seat ring 42 and a pressure ring 41, both of which are sleeved on the circumference of the screw 20, and the seat ring 42 may be arranged between the outlet gasket 32 ​​and the first seal 40 or between the inlet gasket 31 and the first seal 40, and correspondingly, the pressure ring 41 may be arranged between the inlet gasket 31 and the first seal 40 or between the outlet gasket 32 ​​and the first seal 40, that is, the pressure ring 41 and the seat ring 42 are correspondingly distributed at both ends of the first seal 40, wherein the pressure ring 41 is close to the first The end surface of the seal 40 is provided with a protrusion 411, and the end surface of the seat ring 42 close to the first seal 40 is provided with a recessed portion 421 matched with the protrusion 411, that is, the protrusion 411 can be integrally formed on the end surface of the pressure ring 41 or the seat ring 42, and the recessed portion 421 can be integrally formed on the end surface of the seat ring 42 or the pressure ring 41. Through the mutual extrusion of the pressure ring 41 and the seat ring 42, that is, the first seal 40 is extruded into the recessed portion 421 through the protrusion 411, so that the contact between multiple sealing rings can be closer. Among them, the protrusion 411 and the recessed portion 421 can be constructed into any suitable structure. For example, when the screw 20 is sectioned along the vertical section extending along the axial direction of the screw 20, the shape of the protrusion 411 can be a triangle, and correspondingly, the recessed portion 421 can be a triangular groove; in addition, the protrusion and the recessed portion can also be trapezoidal.

[0044] Reference Figure 2 , Figure 3 and Figure 8, a plurality of sealed spaces 11 are arranged in the cylinder body 10, and a screw 20 is arranged in each sealed space 11, that is, the number of sealed spaces 11, screw 20 and first sealing member 40 is the same. In order to improve the fluid delivery efficiency, the sealed spaces 11 can be arranged to be three, four, five or more. The cylinder body 10 is also provided with a first transfer space 14 and a second transfer space 14 which are independent of each other. The independence here means that the first transfer space 14 and the second transfer space 14 are separated and not connected to each other (or it can be understood that a radially extending partition is arranged in the middle of a cylindrical and hollow structure, so as to divide the hollow structure into two separated spaces). The first transfer space 1 The first transfer space 14 and the second transfer space 14 can extend along the axial direction of the cylinder body 10, and the plurality of sealed spaces 11 are evenly distributed around the circumference of the first transfer space 14 and the second transfer space 14. The first transfer space 14 is respectively connected to the fluid inlet 12 and one end of the plurality of spiral grooves, and the second transfer space 14 is respectively connected to the fluid outlet 13 and the other end of the plurality of spiral grooves. Through the first transfer space 14, the fluid entering through the fluid inlet 12 can be transported to one end of the plurality of spiral grooves, and through the second transfer space 14, the fluid discharged through the other end of the plurality of spiral grooves can be guided to the fluid outlet 13, which is conducive to compactly arranging the cylinder body 10 and improving the fluid transportation efficiency. The plurality of screws 20 and the sealed space 11 are provided to increase the displacement of the fracturing pump and increase the pressure of the fluid.

[0045] It should be noted that, refer to Figure 2 and Figure 4 The inlet gasket 31 and the outlet gasket 32 ​​are constructed as a hollow cylindrical structure with both ends penetrated, and are provided with openings 321. The number of the openings 321 is multiple and evenly distributed along the circumference of the inlet gasket 31 and the outlet gasket 32, so that the fluid enters one end of the spiral groove through the sealing space 11 and enters the sealing space 11 through the other end of the spiral groove.

[0046] Further, refer to Figure 3 and Figure 8The cylinder body 10 is provided with a first fluid hole 15 respectively connecting the first transfer space 14 and the sealed space 11, and a second fluid hole 15 respectively connecting the second transfer space 14 and the sealed space 11. That is to say, the first transfer space 14 and the second transfer space 14 were originally separated from the sealed space 11. Under the action of the first fluid hole 15 and the second fluid hole 15, the first transfer space 14 and the sealed space 11 are connected, and the second transfer space 14 and the sealed space 11 are connected. Here, the axis of the first fluid hole 15 is perpendicular to the first transfer space 14 and the sealed space 11 (or, the first fluid hole 15 extends along the radial direction of the cylinder body 10), and the axis of the second fluid hole 15 is perpendicular to the second transfer space 14 and the sealed space 11, respectively. In this way, the time for the fluid to enter the sealed space 11 corresponding to the inlet gasket 31 from the first transfer space 14 and the time for the fluid to enter the second transfer space 14 from the sealed space 11 corresponding to the outlet gasket 32 ​​can be shortened. The first fluid hole 15 corresponds to the fluid inlet 12, that is, after the fluid enters the first transfer space 14 through the fluid inlet 12 on the cylinder body 10, it enters the sealed space 11 corresponding to one end of the spiral groove through the first fluid hole 15. The second fluid hole 15 corresponds to the fluid outlet 13, that is, the fluid passes through the sealed space 11 and the second fluid hole 15 corresponding to the other end of the spiral groove, enters the second transfer space 14, and then is discharged outside the cylinder body 10 through the fluid outlet 13 on the cylinder body 10.

[0047] Reference Figure 2 and Figure 5 The fracturing pump also includes an inlet end cover 50, an outlet end cover 60 and a second seal 70. The inlet end cover 50 is fixedly connected to one end of the cylinder body 10, and the outlet end cover 60 is fixedly connected to the other end of the cylinder body 10. The screw 20 passes through the inlet end cover 50 and extends into the cylinder body 10. The second seal 70 is sleeved on the screw 20 located in the inlet end cover 50. The setting of the second seal 70 is conducive to preventing the fluid from overflowing from the inlet end cover 50. Among them, the part of the screw 20 that matches the second seal 70 is constructed as a bare rod structure. The construction method of the second seal 70 can be the same as the construction method of the first seal 40, that is, a plurality of sealing rings of different materials are used. For example, fluorine fiber cloth sealing rings, nitride porcelain sealing rings, plastic sealing rings and tin bronze sealing rings can be arranged alternately. In addition, the setting of the outlet end cover 60 is conducive to timely repair or replacement of the internal parts of the fracturing pump by removing the outlet end cover 60 when the fracturing pump needs to be repaired. In order to facilitate the removal of the screw 20, an internal threaded hole 22 is provided at the end of the screw 20 (i.e., the end of the screw 20 corresponding to the outlet end cover 60), so that the screw 20 can be pulled out after the rod with an external thread cooperates with the internal threaded hole 22 of the screw 20.

[0048] Reference Figure 2 , Figure 6 and Figure 7 Optionally, the fracturing pump further comprises a fluid input pipe 80, a fluid output pipe 90 and a one-way valve, the one-way valve comprises a first one-way valve 81 and a second one-way valve 91, the number of the fluid input pipe 80 and the fluid output pipe 90 are both at least two, and each fluid input pipe 80 is provided with a first one-way valve 81 for allowing fluid to enter the cylinder 10, and each fluid output pipe 90 is provided with a second one-way valve 91 for allowing fluid to be discharged from the cylinder 10, the second one-way valve 91 is helpful in preventing the fluid from flowing back into the cylinder 10, the first one-way valve 81 and the second one-way valve 91 may both comprise 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 may be at least partially located inside the cylinder 10, and in addition, the cylinder 10 is further provided with There are third fluid holes respectively connecting the first transfer space 14 and the fluid inlet 12, and fourth fluid holes respectively connecting the second transfer space 14 and the fluid outlet 13. The first one-way valve 81 can be at least partially arranged in the third fluid hole, and the second one-way valve 91 can be at least partially arranged in the fourth fluid hole. The guide sleeve 911 of the first one-way valve 81 is connected to the fluid input pipe 80, and the spring 912 of the first one-way valve 81 is located between the guide sleeve 911 and the ball plug 913, and the ball plug 913 is far away from the first transfer space 14 relative to the guide sleeve 911. The guide sleeve 911 of the second one-way valve 91 is connected to the fluid output pipe 90, and the spring 912 of the second one-way valve 91 is located between the guide sleeve 911 and the ball plug 913, and the ball plug 913 is close to the second transfer space 14 relative to the guide sleeve 911.

[0049] At least two fluid input pipes 80 are evenly distributed on the cylinder body 10 and connected to the fluid inlet 12, and at least two fluid output pipes 90 are evenly distributed on the cylinder body 10 and connected to the fluid outlet 13. For example, when the number of fluid input pipes 80 and fluid output pipes 90 is two respectively, 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 pipe 90 can also be arranged in this way. By setting two fluid input pipes 80 and two fluid output pipes 90, the output flow rate of the fracturing pump can be increased. At the same time, the user can also select one of the fluid input pipes 80 and the fluid output pipe 90 according to the requirements of the site.

[0050] Reference Figure 1According to a second aspect of the present invention, a fracturing pump set is provided, including a reducer and the above-mentioned fracturing pump, wherein the output end of the reducer is connected to the screw 20 to drive the screw 20 to rotate. In an embodiment of the present invention, the screw 20 of the fracturing pump is driven to rotate by the reducer. Different from the traditional transmission mechanism (crankshaft) of the fracturing pump, the use of the reducer to drive the screw 20 to rotate is conducive to reducing the occupied space and overall weight of the fracturing pump set, and can also reduce the manufacturing cost, and facilitate the handling and installation of the fracturing pump set. For example, it can be transported by vehicle or skid mounting, and is not easily affected by the geographical and geological location of the mineral deposit.

[0051] Reference Figure 1 , Fig. 9 , Fig.10 and Fig.11 Specifically, the reducer includes a housing 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 mounted in the housing 110. The driving shaft 111 can be connected to an external power source to be driven to rotate by the power source. The central gear 112 is mounted on the driving shaft 111 and is located in the housing 110. The plurality of driven shafts 121 are at least partially rotatably mounted in the housing 110 and are distributed along the circumference of the driving shaft 111, that is, the plurality of driven shafts 121 are evenly distributed along the circumferential direction of the driving shaft 111. A planetary gear 122 is mounted on each driven shaft 121, and each planetary gear 122 is meshed with the central gear 112. The driven shaft 121 is transmission-connected to the screw 20. The number of the driven shafts 121 is consistent with the number of the screws 20, so that each driven shaft 121 is connected to one of the screws 20. Therefore, when the driving shaft 111 rotates driven by an external power source, the driving shaft 111 can drive the planetary gear 122 to rotate through the central gear 112, thereby rotating the driven shaft 121, so that multiple driven shafts 121 can be driven to rotate simultaneously by the driving shaft 111.

[0052] Reference Figure 1 , Figure 5 and Fig.10 As an exemplary embodiment, a first connecting portion 21 is provided at one end of the screw rod 20, and a second connecting portion 123 is provided at one end of the driven shaft 121. The first connecting portion 21 and the second connecting portion 123 can both be configured as gears, so that the first connecting portion 21 and the second connecting portion 123 can be connected together through a coupling sleeve 130, so that the driven shaft 121 and the screw rod 20 can be transmission connected through the coupling sleeve 130.

[0053] Reference Figure 1 and Fig.12Further, 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 irregular shapes, which may be circular, rectangular or other shapes. The support plate 101 may be 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 relative 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 they are relatively disposed on the support plate 101. The support plate 102 is supported on the fracturing pump. Specifically, a groove 1021 matching the outer shape of the cylinder body 10 may be disposed on the support plate 102, which may be conducive to firmly fixing the cylinder body 10 in the groove 1021 of the support plate 102. In addition, since the fracturing pump can be rotated relative to the bottom plate 100 , the staff can adjust the angle of the fracturing pump in the horizontal direction so as to disassemble the inlet end cover 50 and the outlet end cover 60 .

[0054] Reference Fig.12 In addition, a guide block 104 may be provided below the bottom plate 100 to facilitate movement of the fracturing pump unit.

[0055] As a specific implementation of the present invention, a plurality of fracturing pumps may be connected in series to meet the needs of higher pressure applications.

[0056] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A fracturing pump, characterized in that: The invention comprises a cylinder body, a screw and a first sealing member, wherein a sealing space is arranged in the cylinder body, the screw is at least partially rotatably installed in the sealing space, the screw has a spiral groove, a fluid inlet and a fluid outlet are arranged on 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 member is sleeved on the outside of the spiral groove to form a fluid conveying channel with the spiral groove; There are multiple sealed spaces arranged in the cylinder body, each of which is provided with the screw rod, and the cylinder body is also provided with a first transfer space and a second transfer space which are independent of each other, and the multiple sealed spaces are evenly distributed around the circumference of the first transfer space and the second transfer space, the first transfer space is respectively connected with the fluid inlet and one end of the spiral grooves of the multiple screw rods, and the second transfer space is respectively connected with the fluid outlet and the other end of the spiral grooves of the multiple screw rods; The fracturing pump also includes a fluid input pipe, a fluid output pipe and a one-way valve, the one-way valve includes a first one-way valve and a second one-way valve, the number of the fluid input pipe and the fluid output pipe are at least two, and each of the fluid input pipe is provided with the first one-way valve allowing fluid to enter the cylinder body, and each of the fluid output pipe is provided with the second one-way valve allowing fluid to be discharged from the cylinder body, at least two of the fluid input pipes are evenly distributed on the cylinder body and connected to the fluid inlet, and at least two of the fluid output pipes are evenly distributed on the cylinder body and connected to the fluid outlet.

2. The fracturing pump according to claim 1, characterized in that: The first sealing member includes a plurality of coaxial and tightly abutting sealing rings, and at least some of the sealing rings are made of different materials.

3. The fracturing pump according to claim 2, characterized in that: The fracturing pump further comprises an inlet gasket and an outlet gasket fixedly arranged in the sealing space, at least part of the screw is rotatably arranged in the inlet gasket and the outlet gasket, and a plurality of sealing rings are positioned between the inlet gasket and the outlet gasket.

4. The fracturing pump according to claim 3, characterized in that: A protrusion is provided between one of the outlet gasket sleeve and the first seal and between the inlet gasket sleeve and the first seal, and a recessed portion matching with the protrusion is provided between the inlet gasket sleeve and the first seal and between the outlet gasket sleeve and the first seal, so that at least a part of the first seal can be pressed into the recessed portion by the protrusion.

5. The fracturing pump according to claim 1, characterized in that: The cylinder body is provided with a first fluid hole respectively connected to the first transfer space and the sealed space, and a second fluid hole respectively connected to 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.

6. The fracturing pump according to claim 1, characterized in that: The fracturing pump also includes an inlet end cover, an outlet end cover and a second seal. The inlet end cover is fixedly connected to one end of the cylinder body, and the outlet end cover is fixedly connected to the other end of the cylinder body. The screw passes through the inlet end cover and extends into the cylinder body. The second seal is sleeved on the screw located in the inlet end cover.

7. A fracturing pump set, characterized in that: It comprises a speed reducer and the fracturing pump according to any one of claims 1 to 6, wherein the output end of the speed reducer is connected to the screw to drive the screw to rotate; The reducer includes a housing, a central gear, a plurality of planetary gears, a driving shaft and a plurality of driven shafts. The driving shaft is at least partially rotatably mounted in the housing. The central gear is mounted on the driving shaft and is located in the housing. The plurality of driven shafts are at least partially rotatably mounted in the housing and are distributed along the circumference of the driving shaft. Each driven shaft is mounted with the planetary gear, each planetary gear is meshed with the central gear, and the driven shaft is connected to the screw driving rod.

8. The fracturing pump assembly according to claim 7, characterized in that: The fracturing pump group also includes a base, which includes a bottom plate, a support plate, a support plate and a positioning piece. The support plate is rotatably arranged on the bottom plate. The positioning piece is used to lock the support plate on the bottom plate. The support plate is vertically arranged on a side of the support plate away from the bottom plate. The support plate is supported by the fracturing pump.

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