Power end of eccentric wheel type pressurizing water injection pump and pressurizing water injection pump

Abstract

The eccentric wheel type pressurizing water injection pump power end comprises a machine frame, an eccentric driving structure is installed in the machine frame, the eccentric driving structure comprises an eccentric shaft, a plurality of eccentric wheels are arranged on the eccentric shaft, the eccentric wheels are sleeved with large-head bearings matched with the eccentric wheels, and the large-head bearings are arranged on the eccentric shaft. An integral connecting rod is mounted on each large-head bearing; and the eccentric shaft is connected with a power device. The eccentric driving structure is arranged, an eccentric shaft and a bearing structure are used for power output, the eccentric wheel type structure can transmit rotation and revolution, the center of an eccentric wheel is parallel to the center of the main shaft diameter, the center offset distance is the stroke of the pump, the whole crankshaft eccentric wheel, namely the outer circle of the connecting position, is the largest, and the strength and rigidity are enough; in addition, the large end of the connecting rod is of an integrally closed structure, and connecting pieces of the large end are omitted, so that the structure is simplified, parts are reduced, strength and rigidity are good, work is reliable, and installation is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of booster water injection pumps, and in particular to an eccentric wheel type booster water injection pump power end and a booster water injection pump. Background Art

[0002] Oilfield water injection is one of the main processes for secondary oil recovery in my country's oilfields, and it is also an important measure to ensure the stable and high production of oilfields. The booster water injection pump is mainly used for boosting water injection at the end of the oilfield. It is a very important fluid boosting machine with the advantages of high efficiency, energy saving, and easy operation. It is a key equipment in the oilfield production process. The traditional booster water injection pump is mainly a crank (crank) connecting rod mechanism reciprocating pump. Its basic principle is to convert the rotational motion of the prime mover (motor, diesel engine, etc.) through the crankshaft crank (crank), connecting rod, crosshead pin, and crosshead into crosshead reciprocating motion, and then the crosshead drives the reciprocating pump hydraulic end plunger to reciprocate. The movement of the plunger in the sealed closed cavity will cause the volume and pressure of the closed cavity of the reciprocating pump hydraulic end to change, thereby realizing the delivery of the liquid medium through the suction and discharge valves. Due to the harsh operating environment of the booster pump, the complex working conditions, the design parameters and actual use are often different, and there are small changes. The use of the traditional reciprocating water injection pump power end is prone to the following disadvantages:

[0003] (1) The small end bushing and cross pin of the connecting rod are prone to poor lubrication and uneven wear due to local rotation, making them the most prone to failure at the power end of the reciprocating pump. Changes in suction pressure are more likely to cause poor lubrication or even burning of the small end bushing and cross pin of the connecting rod, seriously affecting their service life.

[0004] (2) Since the crankshaft throw and the connecting rod are connected by a connecting rod bearing, when the crankshaft rotates, friction occurs between the connecting rod bearing and the crankshaft, which causes the power end to heat up and the connecting rod bearing and the crankshaft to lock and burn.

[0005] (3) The crankshaft crankshaft connecting part with the connecting rod is the crank pin. Due to structural limitations, overlap and other designs, the crank pin is not the maximum diameter of the entire crankshaft. As the working conditions of the boost pump change during actual use, the plunger force changes, and the crank pin of the crankshaft is prone to breakage.

[0006] (4) As most traditional reciprocating pumps use a crankshaft, in order to facilitate disassembly and adjustment of the big end bearing clearance, the connecting rod big end is made into a split structure, that is, the connecting rod big end is composed of a connecting rod cap and a connecting rod body, and is connected into one with two connecting rod bolts. The connecting rod bolts are subjected to alternating loads and are easy to loosen. Although there are anti-loosening devices and anti-loosening measures, there is still a risk of connecting rod damage or even crankshaft breakage after loosening. Secondly, the processing procedures after splitting are complicated, and the alignment requirements during assembly are high. Summary of the invention

[0007] In view of the above-mentioned defects or shortcomings, the object of the present invention is to provide an eccentric wheel type booster water injection pump power end and a booster water injection pump.

[0008] To achieve the above purpose, the technical solution of the present invention is:

[0009] An eccentric wheel type booster water injection pump power end drive mechanism comprises: a frame, an eccentric drive structure is installed in the frame, the eccentric drive structure comprises: an eccentric shaft, a plurality of eccentric wheels are arranged on the eccentric shaft, a big head bearing matching the eccentric wheel is sleeved on the eccentric wheel, each big head bearing is installed with an integral connecting rod; the eccentric shaft is connected to a power device.

[0010] The eccentric shaft is a linear mechanism, a plurality of eccentric wheels are arranged at equal intervals on the eccentric shaft, and cranks are arranged between the eccentric wheels.

[0011] The eccentric shaft and the eccentric wheel are an integrated structure, and the eccentric wheel includes: a first eccentric wheel, a second eccentric wheel, and a third eccentric wheel. The first eccentric wheel, the second eccentric wheel, and the third eccentric wheel are all equipped with big-head bearings, wherein the directions of the first eccentric wheel, the second eccentric wheel, and the third eccentric wheel differ by 120°.

[0012] The integral connecting rod comprises: a large ring mounting end and a small ring mounting end, an integral rod is arranged between the large ring mounting end and the small ring mounting end, the large ring mounting end is sleeved on the big head bearing, and the small ring mounting end is connected to the piston end.

[0013] Bearings are installed at both ends of the eccentric shaft, and the bearings are installed on the frame through bearing seats.

[0014] The power device is an electric motor or a diesel engine.

[0015] A booster water injection pump comprises: the above-mentioned eccentric wheel type booster water injection pump power end, and the integral connecting rod is connected with the plunger.

[0016] The integral connecting rod is connected with the plunger through a cross head, a cross head pin and an intermediate rod.

[0017] A connecting rod small end bearing is mounted on the crosshead.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The present invention provides an eccentric wheel type booster water injection pump power end and a booster water injection pump, which abandons the small end bushing of the connecting rod of the traditional reciprocating pump drive mechanism, and uses an eccentric shaft, bearing, and eccentric wheel structure to output power by setting an eccentric drive structure. The eccentric wheel structure can not only transmit autorotation but also orbital revolution. The center of the eccentric wheel is parallel to the center of the main shaft diameter, and the center offset distance is the stroke of the pump. The outer circle of the entire crankshaft eccentric wheel at the connection position is the largest, with sufficient strength and rigidity, and convenient installation of the connecting rod. In addition, the big end of the connecting rod adopts an overall closed structure, eliminating the connecting piece of the big end, thereby simplifying its structure, reducing parts, improving strength and rigidity, reliable operation, and easy installation. Through the above design, the purpose of extending the service life of the main parts of the power end and improving the overall performance of the power end is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a sectional view of the power end of the eccentric wheel type booster water injection pump of the present invention;

[0021] Figure 2 This is a top view of the power end of the eccentric wheel type booster water injection pump of the present invention;

[0022] Figure 3 This is a schematic diagram of the eccentric drive structure of the power end of the eccentric wheel type booster water injection pump of the present invention;

[0023] Figure 4 It is a schematic diagram of the integral connecting rod structure of the power end of the eccentric wheel type booster water injection pump of the present invention.

[0024] In the figure, 1 is a frame; 2 is an eccentric drive structure; 3 is a big-head bearing; 4 is an integral connecting rod; 5 is a connecting rod small-end bearing; 6 is a crosshead; 7 is a bearing; 8 is a bearing seat; 21 is an eccentric wheel; 22 is an eccentric shaft; 21-1 is a first eccentric wheel; 21-2 is a second eccentric wheel; 21-3 is a third eccentric wheel; 41 is a large ring mounting end; 42 is an integral rod; 43 is a small ring mounting end. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0026] like Figure 1 , 2As shown, the present invention provides an eccentric wheel type booster water injection pump power end, comprising: a frame 1, an eccentric drive structure 2 is installed in the frame 1, and the eccentric drive structure 2 comprises: an eccentric shaft 22, a plurality of eccentric wheels 21 are arranged on the eccentric shaft 22, a big head bearing 3 matching the eccentric wheel 21 is sleeved on the eccentric wheel 21, and an integral connecting rod 4 is installed on each big head bearing 3; the eccentric shaft 22 is connected to a power device.

[0027] Specifically, Figure 3 As shown, the eccentric shaft 22 is a linear mechanism, and a plurality of eccentric wheels 21 are arranged at equal intervals on the eccentric shaft 22, and a crank 23 is arranged between the eccentric wheels 21. In addition, the eccentric shaft 22 and the eccentric wheel 21 are an integral structure and do not need to be installed in sequence. The use of an eccentric wheel shaft can avoid the difficulties of processing, heat treatment, grinding, etc. of the crankshaft crank pin, thereby simplifying the process. The crank and crank pin positions of the eccentric wheel shaft are opposite to those of the traditional crankshaft, which avoids the crankshaft breakage caused by a small range change in the working conditions of the booster water injection pump. The rigidity and strength are good. Under the same plunger force, the size of the main journal is small, and the shaft is easy to manufacture. The structure is light and compact, and it is easy to obtain a smaller joint spacing, which can make the size of the whole pump smaller and lighter. Specifically, the eccentric wheel 21 includes: a first eccentric wheel 21-1, a second eccentric wheel 21-2, and a third eccentric wheel 21-3, wherein the directions of the first eccentric wheel 21-1, the second eccentric wheel 21-2, and the third eccentric wheel 21-3 differ by 120°. The use of the eccentric wheel shaft structure can avoid the difficulties of processing, heat treatment, grinding, etc. of the crankshaft crankpin, and simplify the process. The crank and crank pin positions of the eccentric wheel shaft are opposite to those of the traditional crank shaft, which avoids the crankshaft breakage caused by a small range of changes in the working conditions of the booster water injection pump. It has good rigidity and strength. Under the same plunger force, the size of the main journal is small, and the shaft is easy to manufacture. The structure is light and compact, and it is easy to obtain a smaller connection spacing, which can make the size of the entire pump smaller and lighter.

[0028] like Figure 4 As shown, the integral connecting rod 4 includes: a large ring mounting end 41 and a small ring mounting end 43, an integral rod 42 is arranged between the large ring mounting end 41 and the small ring mounting end 43, the large ring mounting end 41 is sleeved on the big head bearing 3, and the small ring mounting end 43 is connected to the piston end.

[0029] Preferably, bearings 7 are installed at both ends of the eccentric shaft 22, and the bearings 7 are installed on the frame 1 through bearing seats 71. The power device is usually driven by an electric motor, and other types of power sources, such as a diesel engine, can also be selected. Its basic structure includes a motor or a diesel engine, a speed reducer or a belt drive pair, and a coupling. The motor or diesel engine is responsible for providing the energy required by the pump group, and the speed is reduced by the speed reducer or the pulley drive pair to meet the working requirements of the pump. The coupling plays the role of connecting the motor and the speed reducer, and the speed reducer and the pump. If a belt drive pair is used, the belt is used to connect the pump and the pulley of the motor.

[0030] After the eccentric shaft 22 and the inner ring of the bearing are installed, the power end of the eccentric wheel type booster water injection pump in the present invention directly passes through the bearing seat hole on the side of the frame and is sequentially connected to the connecting rod in each cylinder in a "candied haws" style. Through special designs such as the eccentric wheel shaft, the integral connecting rod, and the use of bearings to replace the connecting rod bearings and small head bushings, the problems of eccentric wear of the crankshaft and crosshead of the booster water injection pump and heating of the power end are effectively solved, thereby achieving the purpose of improving the quality of the power end, extending the service life of the main parts of the booster pump, and reducing noise.

[0031] In addition, the present invention is designed to use an eccentric drive structure 2, and the position of the crank and crank pin is opposite to that of the traditional crankshaft, which avoids the crankshaft breakage caused by a small range of changes in the working conditions of the booster water injection pump. It has good rigidity and strength. Under the same plunger force, the size of the main journal is small, and the shaft is easy to process and manufacture. The structure is light and compact, and it is easy to obtain a smaller joint spacing, which can make the size of the entire pump smaller and lighter. Secondly, the big and small heads of the connecting rod are designed to use rolling bearings to reduce the friction between the crankshaft and the connecting rod, and the connecting rod and the crosshead pin, and avoid the problem of the power end heating due to wear and affecting the performance of the power end. Furthermore, the design uses an integral connecting rod to simplify its structure, reduce parts, have good strength and rigidity, work reliably, and be easy to install. Through the above design, the purpose of extending the service life of the main parts of the power end and improving the overall performance of the power end is achieved.

[0032] In addition, the present invention also provides a booster water injection pump, comprising: the above-mentioned eccentric wheel booster water injection pump power end drive mechanism, the integral connecting rod 4 is connected to the plunger. The integral connecting rod 4 is connected to the plunger through a crosshead 6, a crosshead pin, and an intermediate rod.

[0033] It is obvious to those skilled in the art that the above-mentioned specific examples are only preferred embodiments of the present invention. Therefore, the improvements and changes that may be made by those skilled in the art to certain parts of the present invention still embody the principles of the present invention and achieve the purpose of the present invention, and all belong to the scope of protection of the present invention.

Claims

1. An eccentric wheel type booster water injection pump power end, characterized in that: include: A frame (1), wherein an eccentric drive structure (2) is installed in the frame (1), and the eccentric drive structure (2) comprises: an eccentric shaft (22), a plurality of eccentric wheels (21) are arranged on the eccentric shaft (22), a big-head bearing (3) matching the eccentric wheel (21) is sleeved on the eccentric wheel (21), and each big-head bearing (3) is installed with an integral connecting rod (4); and a power device is connected to the eccentric shaft (22).

2. The eccentric wheel type booster water injection pump power end according to claim 1, characterized in that: The eccentric shaft (22) is a linear mechanism, a plurality of eccentric wheels (21) are arranged at equal intervals on the eccentric shaft (22), and cranks (23) are arranged between the eccentric wheels (21).

3. The eccentric wheel type booster water injection pump power end according to claim 2, characterized in that: The eccentric shaft (22) and the eccentric wheel (21) are an integrated structure. The eccentric wheel (21) comprises: a first eccentric wheel (21-1), a second eccentric wheel (21-2), and a third eccentric wheel (21-3). The first eccentric wheel (21-1), the second eccentric wheel (21-2), and the third eccentric wheel (21-3) are all equipped with a big-head bearing (3). The directions of the first eccentric wheel (21-1), the second eccentric wheel (21-2), and the third eccentric wheel (21-3) differ by 120°.

4. The eccentric wheel type booster water injection pump power end according to claim 3, characterized in that: The integral connecting rod (4) comprises: a large ring mounting end (41) and a small ring mounting end (43); an integral rod (42) is arranged between the large ring mounting end (41) and the small ring mounting end (43); the large ring mounting end (41) is sleeved on the large head bearing (3); and the small ring mounting end (43) is connected to the piston end.

5. The eccentric wheel type booster water injection pump power end according to claim 1, characterized in that: Bearings (7) are installed at both ends of the eccentric shaft (22), and the bearings (7) are installed on the frame (1) through bearing seats (8).

6. The eccentric wheel type booster water injection pump power end according to claim 1, characterized in that: The power device is an electric motor or a diesel engine.

7. A booster water injection pump, characterized in that: include: In the power end of the eccentric wheel type booster water injection pump as described in any one of claims 1 to 3, the integral connecting rod (4) is connected to the plunger.

8. The booster water injection pump according to claim 7, characterized in that: The integral connecting rod (4) is connected to the plunger via a cross head (6), a cross head pin, an intermediate rod and a plunger.

9. The booster water injection pump according to claim 7, characterized in that: The crosshead (6) is provided with a connecting rod small end bearing (5).

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