Opposed-type reciprocating pump

Abstract

The present application relates to the technical field of reciprocating plunger pumps, and discloses an opposed-type reciprocating pump. The opposed-type reciprocating pump comprises a transmission end and hydraulic ends disposed on the left and right sides of the transmission end. The transmission end comprises a body, a crankshaft, connecting rods, and crossheads. The crankshaft, the connecting rods, and the crossheads are mounted on the body. The crankshaft comprises a plurality of crank throws. Two connecting rods are mounted on each crank throw. The two connecting rods respectively extend along the left and right sides of the crankshaft and are connected to the crossheads located on the left and right sides of the crankshaft. The crossheads are connected to plungers corresponding to the hydraulic ends. The overall structure of the present application is more reasonable and compact, the crankshaft has good rigidity, and a lubrication system is simple, thereby providing a high-pressure, high-flow reciprocating pump having low cost, high reliability, and high maintainability.

Description

An opposed reciprocating pump Technical Field

[0001] This application relates to the field of reciprocating piston pump technology, specifically to an opposed reciprocating pump. Background Technology

[0002] Reciprocating pumps are positive displacement pumps that transport liquids by periodically changing the volume of their working chamber. There are many types of reciprocating pumps, classified by drive method as motorized pumps, direct-acting pumps, and manual pumps; and by the position of the piston (plunger) centerline as horizontal pumps, vertical pumps, angle pumps, and opposed pumps. Motorized pumps typically consist of a hydraulic end, a drive end, a reducer, a prime mover, and other auxiliary equipment (lubrication, cooling systems, etc.). The drive end refers to the components from the crosshead to the power input end of the main shaft (crankshaft), mainly composed of the machine body, crankshaft, connecting rod, crosshead, and lubrication and cooling systems. Opposed pumps have two hydraulic ends symmetrically arranged on both sides of the same drive end, resulting in high main shaft rigidity and a compact structure.

[0003] Opposed reciprocating pumps vary considerably in their drive-end arrangement and body structure. The hydraulic end can be symmetrical or asymmetrical, primarily due to differences in connecting rod structure and arrangement. Symmetrical hydraulic ends can employ forked connecting rods, integral eccentric slider connecting rods, and articulated connecting rods. Forked connecting rods are inconvenient for disassembly and lubrication, integral eccentric slider connecting rods are complex and their service life is difficult to guarantee, and articulated connecting rods result in different flow waveforms on both sides, affecting flow pulsation rate. Asymmetrical hydraulic ends can use parallel connecting rods or adjacent connecting rod layouts; however, in adjacent connecting rod configurations, the crankshaft crankpin number equals the piston (plunger) number, resulting in insufficient compactness and poor crankshaft rigidity. Summary of the Invention

[0004] This application aims to provide an opposed reciprocating pump to solve the technical problems of complex structure, poor rigidity, and high cost of the opposed reciprocating pump in the prior art.

[0005] To address the aforementioned technical problems, this application provides an opposed reciprocating pump, comprising a drive end and hydraulic ends arranged on the left and right sides of the drive end. The drive end includes a housing, a crankshaft, connecting rods, and a crosshead. The crankshaft, connecting rods, and crossheads are mounted on the housing. The crankshaft includes multiple cranks, and two connecting rods are mounted on each crank. The two connecting rods extend along the left and right sides of the crankshaft and connect to the crossheads located on the left and right sides of the crankshaft, respectively. The crossheads are connected to the plungers corresponding to the hydraulic ends.

[0006] In some embodiments, the large end of the connecting rod is connected to the crankshaft via a bearing bush, and the small end of the connecting rod is connected to the crosshead via a pin.

[0007] In some embodiments, the machine body is provided with a crankshaft hole for mounting the crankshaft. The crankshaft hole includes a first crankshaft hole located at both ends of the machine body and at least one second crankshaft hole located within the machine body. An end bearing seat is provided at the first crankshaft hole, and an intermediate bearing seat is provided within the machine body. The intermediate bearing seat has the second crankshaft hole.

[0008] In some embodiments, the crankshaft is connected to the end bearing housing via an end bearing, and the crankshaft is connected to the intermediate bearing housing via an intermediate bearing. The end bearing is a self-aligning roller bearing, and the intermediate bearing is a floating cylindrical roller bearing.

[0009] In some embodiments, an expansion sleeve is further provided between the crankshaft and the end bearing.

[0010] In some embodiments, the intermediate bearing housing has a semi-arc structure and is disposed on one side of the crankshaft. The machine body also includes a bearing cap disposed on the other side of the crankshaft. The bearing cap is mated with the intermediate bearing housing and connected to the intermediate bearing.

[0011] In some embodiments, the phase angles of the plurality of cranks are different.

[0012] In some embodiments, the large end of the connecting rod has an obliquely split structure.

[0013] In some embodiments, the body is provided with a crosshead slide, and the crosshead is disposed in the crosshead slide and reciprocates along the crosshead slide.

[0014] In some embodiments, the left and right ends of the machine body are respectively provided with connecting plates that are connected to the hydraulic end.

[0015] The opposed reciprocating pump provided in this application embodiment is configured to include a drive end and hydraulic ends arranged on the left and right sides of the drive end. The drive end includes a body, a crankshaft, connecting rods, and a crosshead. The crankshaft, connecting rods, and crossheads are mounted on the body. The crankshaft includes multiple cranks, and two connecting rods are mounted on each crank. The two connecting rods extend along the left and right sides of the crankshaft and connect to the crossheads located on the left and right sides of the crankshaft. The crossheads are connected to the plungers corresponding to the hydraulic ends. An asymmetrical opposed reciprocating pump structure can be formed by multiple connecting rods mounted on the same crank. The overall structure is more reasonable and compact, and the crankshaft has better rigidity. The lubrication system is simple, providing a low-cost, high-reliability, and high-maintainability high-pressure, high-flow reciprocating pump. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 is a schematic diagram of the structure of the opposed reciprocating pump according to an embodiment of this application;

[0018] Figure 2 is a top view of an opposed reciprocating pump according to an embodiment of this application;

[0019] Figure 3 is a top sectional view of an opposed reciprocating pump according to an embodiment of this application;

[0020] Figure 4 is a schematic diagram of the structure of the opposed reciprocating pump according to an embodiment of this application;

[0021] Figure 5 is a schematic diagram of the crankshaft of the opposed reciprocating pump according to an embodiment of this application;

[0022] Figure 6 is a schematic diagram of the connecting rod of the opposed reciprocating pump according to an embodiment of this application.

[0023] Reference numerals: 10-Transmission end, 1-Main body, 11-First crankshaft hole, 12-Second crankshaft hole, 13-End bearing seat, 14-Intermediate bearing seat, 15-Bearing cap, 16-Crosshead slide, 17-Connecting plate, 2-Crankshaft, 21-Crank crank, 22-Crank arm, 23-Main journal, 3-Connecting rod, 31-Connecting rod big end, 311-Parting face, 32-Connecting rod small end, 4-Crosshead, 5-Bearing shell, 6-Pin, 71-End bearing, 72-Intermediate bearing, 8-Expansion sleeve; 20-Hydraulic end, 201-Plunger. Detailed Implementation

[0024] Various embodiments and features of this application are described herein with reference to the accompanying drawings.

[0025] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this application will be apparent to those skilled in the art.

[0026] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0027] These and other features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0028] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0029] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0030] Specific embodiments of this application are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in a variety of substantially any suitable detailed structures.

[0031] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0032] Figures 1 to 6 show schematic diagrams of the structure of the opposed reciprocating pump according to an embodiment of this application. As shown in Figures 1 to 6, an embodiment of this application provides an opposed reciprocating pump, including a drive end 10 and hydraulic ends 20 arranged on the left and right sides of the drive end 10. The drive end 10 includes a body 1, a crankshaft 2, a connecting rod 3, and a crosshead 4. The crankshaft 2, the connecting rod 3, and the crosshead 4 are mounted on the body 1. The crankshaft 2 includes a plurality of cranks 21, and a plurality of connecting rods 3 are mounted on each crank 21. The plurality of connecting rods 3 extend along the left and right sides of the crankshaft 2 and are connected to the crossheads 4 located on the left and right sides of the crankshaft 2. The crossheads 4 are connected to the plungers 201 corresponding to the hydraulic ends 20.

[0033] Specifically, as shown in Figure 5, the left and right crank arms 22 and the left and right main journals 23 of the crankshaft 2 constitute a crank 21, and the crankshaft 2 is composed of several cranks 21. As shown in Figures 2 and 3, each crank 21 is equipped with two connecting rods 3. One connecting rod 3 extends along the left side of the crankshaft 2 and connects to the crosshead 4 on the left side of the crankshaft 2, and the other connecting rod 3 extends along the right side of the crankshaft 2 and connects to the crosshead 4 on the right side of the crankshaft 2. Since the two connecting rods 2 are arranged at different positions along the axial direction of the crank 21, the plungers 201 on the left and right sides of the crank 21 are located at different positions before and after the transmission end 10, providing an asymmetrical opposed reciprocating pump. For example, in this embodiment, each crankshaft 2 includes 5 cranks, and each crank is provided with 2 connecting rods 3, which are correspondingly connected to 10 plungers 201 to form a five-crank ten-plunger structure. The 10 plungers 201 are staggered along the front and rear direction of the transmission end 10, making the overall structure more reasonable and compact. The main shaft (crankshaft 2) has good rigidity and the lubrication system is simple. At the same time, a single crank 21 can connect to multiple connecting rods 3, which in turn can connect to multiple plungers 201, providing a low-cost, high-reliability, and high-maintainability high-pressure, high-flow reciprocating pump.

[0034] In some embodiments, the large end (connecting rod large end 31) of the connecting rod 3 is connected to the crank 21 through the bearing 5, and the small end (connecting rod small end 32) of the connecting rod 3 is connected to the crosshead 4 through the pin 6, which makes the connection reliable and convenient.

[0035] In some embodiments, the body 1 is provided with a crankshaft hole for mounting the crankshaft 2. The crankshaft hole includes a first crankshaft hole 11 located at the front and rear ends of the body 1 and at least one second crankshaft hole 12 located inside the body 1. An end bearing seat 13 is provided at the first crankshaft hole, and an intermediate bearing seat 14 is provided inside the body 1. The intermediate bearing seat 14 has the second crankshaft hole 12.

[0036] In this embodiment, a corresponding number of second crankshaft holes 12 and intermediate bearing seats 14 can be provided in the body 1 as needed to ensure the rigidity of the crankshaft 2 and reduce the overall weight of the body 1, thereby reducing the cost of the reciprocating pump. At the same time, the end bearing seats 13 provided at both ends of the body 1 ensure a secure connection of the crankshaft 2. For example, in this embodiment, two intermediate bearing seats 14 are provided in the body 1, forming a four-support structure with the two end bearing seats 13 at both ends of the body 1.

[0037] In this embodiment, the staggered design and support form of the crankshaft and crank arm (including crankshaft 2 and connecting rod 3) effectively utilize the structural advantages of the opposed reciprocating pump, reducing the force and internal stress on crankshaft 2, body 1 and bearings.

[0038] In some embodiments, the crankshaft 2 is connected to the end bearing housing 13 via an end bearing 71, and the crankshaft 2 is connected to the intermediate bearing housing 14 via an intermediate bearing 72. The end bearing 71 is a self-aligning roller bearing, and the intermediate bearing is a floating cylindrical roller bearing 72, to ensure reliable connection of the crankshaft 2.

[0039] In some embodiments, an expansion sleeve 8 is provided between the crankshaft 2 and the end bearing 71 to facilitate disassembly and assembly and to ensure that the overall structure is compact and reliable.

[0040] In some embodiments, as shown in Figures 2 and 4, the intermediate bearing housing 14 has a semi-arc structure and is disposed on one side of the crankshaft 2. The body 1 also includes a bearing cap 15 disposed on the other side of the crankshaft 2. The bearing cap 15 also has a semi-arc structure. The bearing cap 15 is connected to the intermediate bearing housing 14 to surround the crankshaft 2, and the bearing cap 15 is connected to the intermediate bearing 72, which facilitates the disassembly and assembly of the crankshaft 2 while ensuring reliable connection of the crankshaft 2.

[0041] In some embodiments, the phase angles of the plurality of cranks 21 are different.

[0042] As shown in Figure 5, crankshaft 2 has five cranks 21 with a crank offset angle of 144°. Starting from the left input end, the phase angle of the first crank is 0°, the phase angle of the second crank is 144°, the phase angle of the third crank is 288°, the phase angle of the fourth crank is 72°, and the phase angle of the fifth crank is 216°. The phase angle of the first crank can also be other angles, or the crank offset angle can be -144°.

[0043] In practice, different phase angles can be set for different bends 21. For example, for three bends and two supports, the bend angles are spaced 120° apart; for five bends and four supports, the bend angles are spaced 144° apart; for seven bends and three supports, the bend angles are Δ, 0x, 2x, 4x, Δ, 6x, 1x, 3x, 5x, Δ, where x = 2 / 7 * 360°; for seven bends and four supports, the bend angles are Δ, 0x, 3x, Δ, 5x, 1x, Δ, 4x, 6x, 2x, Δ, where x = 2 / 7 * 360°.

[0044] As shown in Figure 6, the large end of the connecting rod 3 has a slanted split structure. That is, the split surface 311 of the large end 31 of the connecting rod forms an angle of 30 to 60° with the axis of the connecting rod body, which facilitates the assembly and disassembly of the connecting rod 3 by means of a cylinder.

[0045] As shown in Figure 4, the machine body 1 is provided with a crosshead slide 16, and the crosshead 4 is located in the crosshead slide 16 and reciprocates along the crosshead slide 16. Integrating the crosshead slide 16 onto the machine body 1 makes it easy to assemble and disassemble, and can ensure the reliable reciprocating movement of the crosshead 4.

[0046] As shown in Figure 4, the left and right ends of the body 1 are respectively provided with connecting plates 17 that are connected to the hydraulic end 20, so as to realize quick and convenient assembly and disassembly with the hydraulic end 20.

[0047] In this embodiment, the transmission end body 1 is an integral structure, integrally machined, with good rigidity, low cost, and no sealing problems.

[0048] The above description is merely a preferred embodiment of this application and an explanation of the techniques used. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

[0049] Furthermore, while the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. Multitasking and parallel processing may be advantageous in certain environments. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this application. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0050] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A counter-flow reciprocating pump, characterized in that, The device includes a transmission end and hydraulic ends arranged on the left and right sides of the transmission end. The transmission end includes a machine body, a crankshaft, connecting rods, and a crosshead. The crankshaft, connecting rods, and crossheads are mounted on the machine body. The crankshaft includes multiple cranks, and two connecting rods are mounted on each crank. The two connecting rods extend along the left and right sides of the crankshaft and connect to the crossheads located on the left and right sides of the crankshaft, respectively. The crossheads are connected to the plungers corresponding to the hydraulic ends.

2. The opposed reciprocating pump according to claim 1, characterized in that, The large end of the connecting rod is connected to the crankshaft via a bearing bush, and the small end of the connecting rod is connected to the crosshead via a pin.

3. The opposed reciprocating pump according to claim 1, characterized in that, The machine body is provided with crankshaft holes for mounting the crankshaft. The crankshaft holes include first crankshaft holes located at the front and rear ends of the machine body and at least one second crankshaft hole located inside the machine body. An end bearing seat is provided at the first crankshaft hole, and an intermediate bearing seat is provided inside the machine body. The intermediate bearing seat has the second crankshaft hole.

4. The opposed reciprocating pump according to claim 3, characterized in that, The crankshaft is connected to the end bearing housing via an end bearing, and the crankshaft is connected to the intermediate bearing housing via an intermediate bearing. The end bearing is a self-aligning roller bearing, and the intermediate bearing is a floating cylindrical roller bearing.

5. The opposed reciprocating pump according to claim 4, characterized in that, An expansion sleeve is also provided between the crankshaft and the end bearing.

6. The opposed reciprocating pump according to claim 4, characterized in that, The intermediate bearing housing has a semi-arc structure and is located on one side of the crankshaft. The machine body also includes a bearing cap located on the other side of the crankshaft. The bearing cap is mated with the intermediate bearing housing and connected to the intermediate bearing.

7. The opposed reciprocating pump according to claim 1, characterized in that, The phase angles of the multiple cranks are different.

8. The opposed reciprocating pump according to claim 1, characterized in that, The large end of the connecting rod has an oblique split structure.

9. The opposed reciprocating pump according to claim 1, characterized in that, The machine body is provided with a crosshead slide, and the crosshead is located in the crosshead slide and moves back and forth along the crosshead slide.

10. The opposed reciprocating pump according to claim 1, characterized in that, The machine body is provided with connecting plates at its left and right ends, which are connected to the hydraulic end.

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