CN117189532A - Reciprocating plunger pump and pump station - Google Patents

Abstract

The application relates to a reciprocating plunger pump and a pump station, the reciprocating plunger pump comprises: the power end comprises a crank shaft assembly and two transmission assemblies, the crank shaft assembly comprises a crank shaft and a crank shaft, the crank shaft rotates to penetrate through the crank shaft, the two transmission assemblies are connected with the crank shaft, the two hydraulic ends are respectively arranged on two opposite sides of the crank shaft along the radial direction of the crank shaft, and the two transmission assemblies are respectively connected with two plungers of the hydraulic ends so as to drive the plungers to reciprocate. The application has balanced stress when the reciprocating plunger pump works, is beneficial to prolonging the service life of the reciprocating plunger pump, has compact structure and can meet the parameter requirements of higher pressure and flow.

Description

Reciprocating plunger pump and pump station

Technical Field

The application relates to the technical field of pump stations, in particular to a reciprocating plunger pump and a pump station.

Background

The reciprocating pump relates to a fracturing pump, a well cementation pump, an emulsion pump, a spray pump and the like. Reciprocating plunger pumps are used to periodically change the volume of a working chamber by reciprocating a plunger (piston) within the working chamber of a hydraulic cylinder or by periodically elastically deforming a flexible element such as a diaphragm, bellows, or the like within the working chamber.

In the related art, the horizontal component of mechanical inertia force generated when the reciprocating plunger pump used underground coal mines runs is larger, the stress condition of a main shaft is poorer, the service life of the main shaft and a supporting part is influenced, and the structural size of the reciprocating plunger pump is larger under the requirement of the same pressure and flow, so that the reciprocating plunger pump is not beneficial to transportation and installation.

Disclosure of Invention

The present application aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the application provides the reciprocating plunger pump, which has balanced stress during the working, is beneficial to prolonging the service life of the reciprocating plunger pump, has a compact structure and can meet the parameter requirements of higher pressure and flow.

The embodiment of the application also provides a pump station.

The reciprocating plunger pump of the embodiment of the present application includes: the power end comprises a crankshaft assembly and two transmission assemblies, the crankshaft assembly comprises a crank case and a crankshaft, the crankshaft is rotatably arranged in the crank case in a penetrating mode, and the two transmission assemblies are connected with the crankshaft; the two hydraulic ends are respectively arranged on two opposite sides of the crank case along the radial direction of the crank shaft, and the two transmission assemblies are respectively connected with the plungers of the two hydraulic ends so as to drive the plungers to reciprocate.

According to the reciprocating plunger pump provided by the embodiment of the application, as the two hydraulic ends are respectively arranged at the two opposite sides of the crank case along the radial direction of the crank shaft, the crank shaft assembly can control the two hydraulic ends to move respectively through the two transmission assemblies, so that the mechanical inertia force horizontal component force generated during the operation of the reciprocating plunger pump can be mutually offset through the hydraulic ends at the two sides, the stress effect of the crank shaft assembly is better, and the service life of the reciprocating plunger pump is prolonged. In addition, as one crank shaft component can control the movement of two hydraulic ends at the same time, the whole structure of the reciprocating plunger pump is compact, the size is smaller, and under the condition of limiting the same external dimension, the reciprocating plunger pump can meet the requirements of higher pressure and flow parameters, and the use effect is better.

In some embodiments, the crankshaft has a bell crank section, the transmission assembly includes a first link member and a second link member, one end of the first link member is connected to the bell crank section, the other end of the first link member is connected to the plunger of one of the fluid ends, one end of the second link member is connected to the bell crank section, and the other end of the second link member is connected to the plunger of the other of the fluid ends.

In some embodiments, the crank sections, the first connecting rod parts and the second connecting rod parts are all multiple, the crank sections are arranged at intervals along the axial direction of the crankshaft, each crank section corresponds to one first connecting rod part and one second connecting rod part, the first connecting rod parts correspond to the plungers of one hydraulic end one by one, and the second connecting rod parts correspond to the plungers of the other hydraulic end one by one.

In some embodiments, the projections of the plurality of crank segments on the projection plane are equally spaced along the circumferential direction of the crankshaft in a projection plane orthogonal to the axial direction of the crankshaft.

In some embodiments, the first link member and the second link member each include an intermediate box, a pull rod, and a cross-head link, the intermediate box is disposed between the crankcase and the fluid end, one end of the pull rod is connected to the crank section, the other end of the pull rod is movably connected to one end of the cross-head link, the cross-head link is slidably disposed through the intermediate box, and the other end of the cross-head link is connected to the plunger.

In some embodiments, the fluid end includes a cylinder body and the plunger slidably coupled to the cylinder body, and the crosshead link is threadably coupled to the plunger.

In some embodiments, the crankshaft assembly further comprises a plurality of support bearings, the crankshaft is provided with a plurality of support sections, the support sections and the crank sections are arranged in a staggered manner along the axial direction of the crankshaft, the support sections are in one-to-one correspondence with the support bearings, the inner rings of the support bearings are mounted on the outer walls of the support sections, and the outer rings of the support bearings are propped against the inner wall of the crankcase.

In some embodiments, the hydraulic ends have the same number of cylinders and are symmetrically arranged along the radial direction of the crankshaft.

A pump station according to another embodiment of the present application comprises a reciprocating plunger pump according to any one of the embodiments of the present application; and the driving device is connected with the crankshaft and is used for driving the crankshaft to rotate.

According to the pump station disclosed by the embodiment of the application, as the two hydraulic ends are respectively arranged at the two opposite sides of the crank case along the radial direction of the crank shaft, the crank shaft assembly can control the two hydraulic ends to move respectively through the two transmission assemblies, so that the mechanical inertia force horizontal component force generated during the operation of the reciprocating plunger pump can be offset through the hydraulic ends at the two sides, the stress effect of the crank shaft assembly is better, and the service life of the reciprocating plunger pump is prolonged. In addition, as one crank shaft component can control the movement of two hydraulic ends at the same time, the whole structure of the reciprocating plunger pump is compact, the size is smaller, and under the condition of limiting the same external dimension, the reciprocating plunger pump can meet the requirements of higher pressure and flow parameters, and the use effect is better.

In some embodiments, the drive device comprises an electric motor and a decelerator, the electric motor being coupled to the decelerator, the decelerator being coupled to one end of the crankshaft; and/or, further comprising a base, wherein the reciprocating plunger pump and the driving device are detachably mounted on the base.

Drawings

FIG. 1 is a schematic view of a pump station according to an embodiment of the application.

Fig. 2 is a schematic diagram of the installation of a reciprocating plunger pump and a decelerator according to an embodiment of the present application.

Fig. 3 is a sectional view showing the installation of the reciprocating plunger pump and the decelerator according to the embodiment of the present application.

Fig. 4 is a schematic view of the installation of a crankshaft and drive assembly of a reciprocating plunger pump according to an embodiment of the present application.

Reference numerals:

1. a power end; 11. a crankshaft assembly; 111. a crankcase; 112. a crankshaft; 1121. a bell crank section; 1122. a support section; 113. a support bearing; 12. a transmission assembly; 121. a first link member; 122. a second link member; 1221. an intermediate box; 1222. a pull rod; 1223. a crosshead link;

2. a hydraulic end; 21. a liquid cylinder; 22. a plunger;

3. a driving device; 31. a speed reducer; 32. a motor;

4. and (5) a base.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.

A reciprocating plunger pump and a pump station according to an embodiment of the present application are described below with reference to fig. 1 to 4.

As shown in fig. 1 and 2, a reciprocating plunger pump according to an embodiment of the present application includes a power end 1 and two fluid ends 2. The power end 1 comprises a crankshaft assembly 11 and two transmission assemblies 12, wherein the crankshaft assembly 11 comprises a crank case 111 and a crank shaft 112, the crank shaft 112 is rotatably arranged on the crank case 111 in a penetrating mode, and the two transmission assemblies 12 are connected with the crank shaft 112. The two fluid ends 2 are disposed on opposite sides of the crank case 111 in the radial direction of the crank shaft 112, respectively, and the two transmission assemblies 12 are connected to the plungers 22 of the two fluid ends 2, respectively, to reciprocate the plungers 22.

According to the reciprocating plunger pump of the embodiment of the application, as the two hydraulic ends 2 are respectively arranged at two opposite sides of the crank case 111 along the radial direction of the crank shaft 112, the crank shaft assembly 11 can control the two hydraulic ends 2 to move respectively through the two transmission assemblies 12, so that the mechanical inertia force horizontal component force generated during the operation of the reciprocating plunger pump can be offset by the hydraulic ends 2 at the two sides, so that the stress effect of the crank shaft assembly 11 is better, the service life of the reciprocating plunger pump is prolonged, the vibration and noise generated by the reciprocating plunger pump are smaller, and the reliability is higher.

In addition, as one crank shaft assembly 11 can control the movement of the two hydraulic ends 2 simultaneously, the whole structure of the reciprocating plunger pump is compact, the size is small, the processing is convenient, and the underground transportation and the installation of a coal mine are convenient. Under the same limiting condition of external dimensions, the reciprocating plunger pump can meet the requirements of higher pressure and flow parameters, and has better use effect.

Alternatively, the two hydraulic ends 2 have the same number of cylinders and are symmetrically arranged in the radial direction of the crankshaft 112. It will be appreciated that the two fluid ends 2 are identical in structure and are symmetrically arranged about the crankshaft 112, thereby providing a better force-receiving effect of the fluid ends 2. In other embodiments, the number of cylinders of the two hydraulic ends 2 is different, and the present application is not limited thereto.

In some embodiments, as shown in fig. 4, the crankshaft 112 has a bell crank section 1121, and the transmission assembly 12 includes a first link member 121 and a second link member 122, one end of the first link member 121 being connected to the bell crank section 1121, the other end of the first link member 121 being connected to the plunger 22 of one fluid end 2, one end of the second link member 122 being connected to the bell crank section 1121, and the other end of the second link member 122 being connected to the plunger 22 of the other fluid end 2. It will be appreciated that one bell crank section 1121 is connected to both the first link member 121 and the second link member 122, in other words, when the bell crank section 1121 rotates, the first link member 121 and the second link member 122 corresponding to the bell crank section 1121 simultaneously rotate. The reciprocating plunger pump of the embodiment of the application can make the installation of the crankshaft 112 and the transmission assembly 12 more compact and has better stress effect by arranging the first connecting rod part 121 and the second connecting rod part 122 in the structure.

Alternatively, as shown in fig. 4, the plurality of crank segments 1121, the first link member 121 and the second link member 122 are all plural, the plurality of crank segments 1121 are arranged at intervals along the axial direction of the crankshaft 112, each crank segment 1121 corresponds to one first link member 121 and one second link member 122, the plurality of first link members 121 corresponds to the plurality of plungers 22 of one fluid end 2 one by one, and the plurality of second link members 122 corresponds to the plurality of plungers 22 of the other fluid end 2 one by one. It will be appreciated that the two hydraulic ends 2 are of multi-cylinder construction, and each cylinder 21 is provided with a corresponding plunger 22. In other embodiments, the hydraulic end 2 may also be a single cylinder structure, which is not limited in the present application.

In some embodiments, the projections of the plurality of bell crank segments 1121 on the projection plane in a projection plane orthogonal to the axial direction of the crankshaft 112 are equally spaced along the circumferential direction of the crankshaft 112. It will be appreciated that the crankshaft 112 may be provided with a positive integer number N of bell crank segments 1121, with two connecting rod members (i.e., the first connecting rod member 121 and the second connecting rod member 122) symmetrically disposed at each bell crank segment 1121, as desired. Compared with one connecting rod component (the first connecting rod component 121 or the second connecting rod component 122) of each crank segment 1121, the structure of the crankshaft 112 can be compact, the number of the crank segments 1121 is smaller, and the stress condition is better. Specifically, N bell crank segments 1121 are circumferentially sequentially spaced at an included angle α, α=360°/N. By arranging the crankshaft 112 in the structure, the reciprocating plunger pump provided by the embodiment of the application can ensure that the stress effect of the crankshaft 112 is better, and is beneficial to prolonging the service life of the crankshaft 112.

Specifically, as shown in fig. 2 and 4, each of the first link member 121 and the second link member 122 includes an intermediate case 1221, a tie rod 1222, and a cross-head link 1223, the intermediate case 1221 is disposed between the crankcase 111 and the fluid end 2, one end of the tie rod 1222 is connected to the crank section 1121, the other end of the tie rod 1222 is movably connected to one end of the cross-head link 1223, the cross-head link 1223 is slidably disposed through the intermediate case 1221, and the other end of the cross-head link 1223 is connected to the plunger 22. It will be appreciated that the tie rod 1222 is rotatably coupled to the bell crank segment 1121, and the cross-head link 1223 is slidably coupled to the intermediate box 1221. In other words, the crankshaft 112, the tie rod 1222, and the crosshead link 1223 together form a slider-crank mechanism of the reciprocating plunger pump, and when the crankshaft 112 rotates, the rotational motion of the driving device 3 can be converted into the linear reciprocating motion of the crosshead link 1223.

For example, the plunger 22 is screwed with the crosshead link 1223, and the plunger 22 follows the crosshead link 1223 to reciprocate the plunger 22 within the hydraulic cylinder 21.

Optionally, as shown in fig. 4, the crankshaft assembly 11 further includes a plurality of support bearings 113, where the crankshaft 112 is provided with a plurality of support segments 1122, and the support segments 1122 and the crank segments 1121 are staggered along the axial direction of the crankshaft 112, in other words, one crank segment 1121 is provided between every two adjacent support segments 1122. The plurality of support sections 1122 are in one-to-one correspondence with the plurality of support bearings 113, and an inner ring of the support bearings 113 is mounted on an outer wall of the support sections 1122, and an outer ring of the support bearings 113 abuts against an inner wall of the crankcase 111. It will be appreciated that when the crankshaft 112 rotates relative to the crankcase 111, rotational support may be provided by the support bearing 113, thereby improving the stability of the crankshaft assembly 11 as it rotates.

In some specific examples, the fluid end 2 further includes intake and exhaust valves, valve boxes, valve covers and stuffing boxes, and inlet and outlet flanges. When the motor rotates, the plunger 22 reciprocates together with the crosshead link 1223, and the fluid end 2 is an important component for converting mechanical energy of the reciprocation of the plunger 22 into hydraulic energy. Corresponding safety valves can be arranged on the hydraulic end 2 to ensure that the discharge pressure of the pump is not higher than the rated value of the pump, and the motor and corresponding structural components are protected from damage caused by the ultrahigh system pressure.

Alternatively, the hydraulic end 2 of the reciprocating plunger pump may be provided with plungers 22 and plunger seals with different diameters, the small diameter plungers 22 and plunger seals may meet the working condition requirements of high pressure and low flow, the large diameter plungers 22 and plunger seals may meet the working condition requirements of low pressure and high flow, and two or more diameter plungers 22 and plunger seals may be provided according to the working condition requirements.

As shown in fig. 1, a pump station according to another embodiment of the present application includes a reciprocating plunger pump according to the present application and a driving device 3, where the driving device 3 is connected to a crankshaft 112 for driving the crankshaft 112 to rotate.

According to the pump station of the embodiment of the application, as the two hydraulic ends 2 are respectively arranged at two opposite sides of the crank case 111 along the radial direction of the crank shaft 112, the crank shaft assembly 11 can control the two hydraulic ends 2 to move respectively through the two transmission assemblies 12, so that the mechanical inertia force horizontal component force generated during the operation of the reciprocating plunger pump can be offset through the hydraulic ends 2 at the two sides, the stress effect of the crank shaft assembly 11 is better, and the service life of the reciprocating plunger pump is prolonged. In addition, as one crank shaft assembly 11 can control the two hydraulic ends 2 to move simultaneously, the whole structure of the reciprocating plunger pump is compact, the size is smaller, and under the condition of limiting the same external dimension, the reciprocating plunger pump can meet the requirements of higher pressure and flow parameters, and the use effect is better.

Alternatively, as shown in fig. 1, the driving device 3 includes a motor 32 and a speed reducer 31, the motor 32 is connected to the speed reducer 31 through a coupling, and the speed reducer 31 is connected to one end of the crankshaft 112. The working process of the pump station is as follows: when the motor 32 is electrified to rotate, the motor 32 drives the speed reducer 31 to rotate, the speed reducer 31 drives the crankshaft 112 at the transmission end to rotate, the crankshaft 112 rotates to drive the cross head connecting rod 1223 and the plunger 22 to reciprocate through the pull rod 1222, and the plunger 22 reciprocates in the liquid cylinder 21 to periodically change the volume of the working cavity, so that the mechanical energy of the motor 32 is directly converted into pressure energy for conveying liquid through the reciprocating plunger pump.

Furthermore, the pump station can be driven by adopting an explosion-proof and intrinsic safety type motor, and all control system components such as sensors and the like are intrinsic safety type components so as to meet the underground explosion-proof requirement of the coal mine, and meanwhile, the hydraulic end and the high-pressure medium are designed according to the underground An Biao requirement of the coal mine, so that the pump station can be better applied to the underground use environment requirement of the coal mine.

Optionally, as shown in fig. 1, the pump station further comprises a base 4, and the reciprocating plunger pump and the driving device 3 are detachably mounted on the base 4. For example, the reciprocating plunger pump, the decelerator 31 and the motor 32 may be mounted on the base 4 by screw locking, thereby facilitating the transportation and movement of the pump station as a whole.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the application.

Claims (10)

1. A reciprocating plunger pump, comprising:

the power end comprises a crankshaft assembly and two transmission assemblies, the crankshaft assembly comprises a crank case and a crankshaft, the crankshaft is rotatably arranged in the crank case in a penetrating mode, and the two transmission assemblies are connected with the crankshaft;

the two hydraulic ends are respectively arranged on two opposite sides of the crank case along the radial direction of the crank shaft, and the two transmission assemblies are respectively connected with the plungers of the two hydraulic ends so as to drive the plungers to reciprocate.

2. The reciprocating plunger pump of claim 1, wherein said crankshaft has a bell crank section, said transmission assembly includes a first link member and a second link member, one end of said first link member being connected to said bell crank section, the other end of said first link member being connected to said plunger of one of said fluid ends, one end of said second link member being connected to said bell crank section, the other end of said second link member being connected to said plunger of the other of said fluid ends.

3. The reciprocating plunger pump of claim 2, wherein said bell crank section, said first link member and said second link member are each plural, a plurality of said bell crank sections are arranged at intervals in an axial direction of said crankshaft, each of said bell crank sections corresponds to one of said first link member and one of said second link member, a plurality of said first link members corresponds to a plurality of said plungers of one of said fluid ends one by one, and a plurality of said second link members corresponds to a plurality of said plungers of the other of said fluid ends one by one.

4. A reciprocating plunger pump as claimed in claim 3, wherein projections of a plurality of said crank segments on a projection plane orthogonal to an axial direction of said crankshaft are arranged at equal intervals in a circumferential direction of said crankshaft.

5. The reciprocating plunger pump of claim 2, wherein the first and second link members each comprise an intermediate box, a pull rod and a cross-head link, the intermediate box is disposed between the crankcase and the fluid end, one end of the pull rod is connected to the bell crank section, the other end of the pull rod is movably connected to one end of the cross-head link, the cross-head link is slidably disposed through the intermediate box, and the other end of the cross-head link is connected to the plunger.

6. The reciprocating plunger pump of claim 5, wherein said fluid end comprises a cylinder body and said plunger, said plunger being slidably coupled to said cylinder body and said crosshead link being threadably coupled to said plunger.

7. The reciprocating plunger pump of claim 2, wherein the crankshaft assembly further comprises a plurality of support bearings, the crankshaft is provided with a plurality of support sections, the support sections and the crank sections are arranged in a staggered manner along the axial direction of the crankshaft, the plurality of support sections are in one-to-one correspondence with the plurality of support bearings, an inner ring of the support bearings is mounted on the outer wall of the support sections, and an outer ring of the support bearings abuts against the inner wall of the crankcase.

8. The reciprocating plunger pump according to any one of claims 1 to 7, wherein the number of cylinders of both said hydraulic ends is the same and is arranged symmetrically in the radial direction of said crankshaft.

9. A pump station, comprising:

a reciprocating plunger pump according to any one of claims 1 to 8;

and the driving device is connected with the crankshaft and is used for driving the crankshaft to rotate.

10. The pump station of claim 9, wherein the drive means comprises an electric motor and a speed reducer, the electric motor being coupled to the speed reducer, the speed reducer being coupled to one end of the crankshaft;

and/or, further comprising a base, wherein the reciprocating plunger pump and the driving device are detachably mounted on the base.