阅读说明：本技术 一种往复泵中间杆与活塞杆（柱塞）连接结构 (Connecting structure for intermediate rod and piston rod (plunger) of reciprocating pump ) 是由 黄秀芳 于 2021-08-26 设计创作，主要内容包括：本发明公开了一种往复泵中间杆与活塞杆(柱塞)连接结构,涉及石油工程设备领域的钻井泵和压裂泵,具体涉及一种往复泵中间杆与活塞杆(柱塞)连接结构、包括中间杆、连接器上部、弹簧垫圈、M12螺钉、活塞杆(柱塞)、连接器下部、锁扣上部件、锁扣下部件,连接器上部和连接器下部在旋紧和松开M12螺钉时,先用锁扣上部件和锁扣下部件轻松地连接在一起,活塞杆(柱塞)通过圆弧面与中间杆圆柱内孔配合,这种连接结构,不仅仅是能保证中间杆和活塞杆(柱塞)个两零件连接在一起后的同轴度精度高,两个零件安装和拆卸安全、轻松、方便,还使连接两个零件的连接器总成重量降低,节约材料比例为84.68%。(The invention discloses a connecting structure of a middle rod and a piston rod (plunger) of a reciprocating pump, which relates to a drilling pump and a fracturing pump in the field of petroleum engineering equipment, in particular to a connecting structure of a middle rod and a piston rod (plunger) of a reciprocating pump, which comprises a middle rod, an upper connector part, a spring washer, an M12 screw, a piston rod (plunger), a lower connector part, an upper lock catch part and a lower lock catch part, wherein when the M12 screw is screwed and loosened, the upper lock catch part and the lower lock catch part are firstly and easily connected together, the piston rod (plunger) is matched with an inner hole of a cylinder of the middle rod through an arc surface, the connecting structure can ensure that the coaxiality precision of the two parts of the middle rod and the piston rod (plunger) is high, the two parts are safely, easily and conveniently installed and disassembled, and the weight of a connector assembly for connecting the two parts is reduced, the material saving ratio was 84.68%.)

1. The utility model provides a reciprocating pump intermediate lever and piston rod (plunger) connection structure, its characterized in that, intermediate lever (1), connector upper portion (2), spring washer (3), M12 screw (4), piston rod (plunger) (5), connector lower part (6), terminal surface (1.1), hole (1.3), hasp upper part (2.5), clamp upper portion (2.7), terminal surface (5.1), arc surface (5.3), hasp lower part (6.4), clamp lower part (6.5).

2. A connecting structure of an intermediate rod and a piston rod (plunger) of a reciprocating pump as claimed in claim 1, wherein the upper connector part (2) and the lower connector part (6) are easily connected together by the upper locking part (2.5) and the lower locking part (6.4) when the M12 screw (4) is tightened and loosened, and the intermediate rod (1) and the piston rod (plunger) (5) are safely, reliably and easily assembled and disassembled.

3. The connecting structure of the intermediate rod and the piston rod (plunger) of the reciprocating pump according to claim 1, wherein the diameter of the arc surface (5.3) of the piston rod (plunger) 5 and the diameter of the inner hole (1.3) of the intermediate rod (1) are matched in a clearance fit mode, the clearance is 0-0.034 mm, the inner hole contact of the two parts is a line, and the end surface (1.1) and the end surface (5.1) of the two parts are in very tight contact, so that the matching can ensure high coaxiality precision of the two parts of the piston rod (plunger) (5) of the intermediate rod (1) during assembly, and can also ensure that the intermediate rod (1) and the piston rod (plunger) (5) can be easily separated by shaking the piston rod (plunger) 5 up and down during disassembly.

4. A reciprocating pump intermediate rod and piston rod (plunger) connecting structure as claimed in claim 1, wherein the spring washer (3) can prevent the M12 screw (4) from loosening.

5. The structure of claim 1, wherein the total weight of the upper connector portion (2) and the lower connector portion (6) of the 2400hp intermediate rod and piston rod (plunger) of the reciprocating pump is only 3.7 kg-3.9 kg.

6. A reciprocating pump intermediate rod and piston rod (plunger) connection structure as claimed in claim 1, said M12 screw is not limited to such gauge screw.

Technical Field

The invention relates to the field of petroleum engineering equipment, in particular to a connecting structure of a reciprocating pump intermediate rod and a piston rod (plunger).

Background

The most used reciprocating pumps in the field of petroleum engineering equipment mainly comprise a slurry pump (also called a drilling pump) and a plunger pump (also called a fracturing pump), and the two reciprocating pumps have a common characteristic: in a crank-connecting rod mechanism of a reciprocating pump, in order to reduce or eliminate the lateral pressure of a piston (plunger) to a cylinder sleeve (filler), a crosshead assembly and an intermediate rod are added between a small end of a connecting rod and a piston rod (plunger); the small end of the connecting rod is connected with the crosshead, the crosshead reciprocates on a crosshead slide way of the rack, the end surface of the crosshead is connected with the end surface of the intermediate rod, the intermediate rod is connected with a piston rod (plunger), and the piston rod (plunger) reciprocates in an inner hole of the valve box. The key requirements for connecting the parts are as follows:

1. the outer circle axis of the crosshead, the outer circle axis of the intermediate rod, the outer circle axis of the piston rod (plunger) and the inner hole axis of the valve box are coaxial, the precision is higher, the service lives of the parts are longer, and the service lives of the parts are shorter.

2. The connection between every two parts not only ensures the coaxial axes, but also requires reliable connection and convenient disassembly and assembly.

The connection structure between the intermediate rod and the piston rod (plunger) has two problems to be improved at present:

the first step 1 is that after the intermediate rod and the piston rod (plunger) are used for a period of time, the intermediate rod and the piston rod (plunger) are sometimes difficult to disassemble, and the piston rod (plunger) can be loosened only by knocking the piston rod (plunger) with great force, so that the piston rod (plunger) is damaged.

And 2, a clamp connected with the intermediate rod and the piston rod (plunger) is too heavy, so that the labor intensity of workers in mounting and dismounting is high.

Therefore, it is a problem to be solved to design a connecting structure of a middle rod and a piston rod (plunger) of a reciprocating pump to improve the above two problems.

Disclosure of Invention

The invention aims to provide a connecting structure of a middle rod and a piston rod (plunger) of a reciprocating pump.

The technical scheme of the invention is as follows:

the connection structure between the intermediate lever and the piston rod (plunger) was analyzed for two reasons of problems that need to be improved, and then corresponding countermeasures were taken.

1. The end face and the upper hole of the end face of the front intermediate rod and the cylindrical surfaces of the end face and the end face of the piston rod (plunger) are positioned, and then the intermediate rod and the piston rod are clamped by a clamp. The assembly is easier, the piston rod (plunger) is held by hands after positioning, the piston rod (plunger) is pushed towards the direction of the middle rod hole with force, for accurate positioning of the axes of the middle rod and the piston rod (plunger), the fit clearance between the positioning hole on the end face of the middle rod and the positioning outer cylindrical surface of the piston rod (plunger) is very small, and theoretically the minimum clearance is zero. If the method of assembling the piston rod (plunger) is used, the piston rod (plunger) can not be pulled out in the direction away from the middle rod by holding the excircle of the piston rod (plunger) by hands, and the piston rod (plunger) can not be swung by shaking up and down by hands. In this case, the hammer is used to strike the matched end face of the intermediate rod and the piston rod (plunger) with great force. The mating surfaces are then susceptible to knocking deformation.

The solution is that the cylindrical surface of the piston rod (plunger) matched with the middle rod hole is designed into a spherical surface, the end surface of the piston rod (plunger) is matched with the end surface of the middle rod unchanged, but the spherical surface of the piston rod (plunger) is matched with the middle rod hole to be in line contact, so that the original cylindrical surface contact condition is changed, when the piston rod (plunger) is disassembled, the outer circle of the piston rod (plunger) is held by hand to shake up and down, and the piston rod (plunger) and the middle rod are easily separated.

2. The clamp for connecting the intermediate rod and the piston rod (plunger) in the front of the invention has large volume and heavy weight, for example, the clamp for a drilling pump introduced into the United states is 25kg in weight, the upper part and the lower part of the clamp are fastened together by two threads with the diameter of 25.4mm, in order to assemble and disassemble the clamp, the upper part and the lower part of the clamp are not completely separated and are connected by a thick iron chain, and the assembly and the disassembly must be carried out by two persons. Through the analysis, the effect of clamp is only to guarantee that intermediate lever and piston rod do not separate, single direction effect when all owing to present reciprocating pump, piston rod (plunger) just compress liquid discharge toward the fluid end direction promptly, the intermediate lever promotes piston rod (plunger) forward, but when the intermediate lever moves backward, liquid is the suction process, piston rod (plunger) do not receive thrust, at this moment piston rod (plunger) atress is very little, only need overcome the frictional force between piston (plunger) and the cylinder liner (packing), generally only there is the frictional force below 100N.

The reason is found, the size of the clamp is greatly reduced, the weight is greatly reduced, and only 2 bolts with the diameter of 12mm are needed for connecting the upper connector and the lower connector. For a 2400hp high power reciprocating pump connector only 3.83kg is required. When the upper part and the lower part of the connector are screwed and loosened, the upper part and the lower part are firstly connected by two hasps, so that the operation is very easy and convenient.

After improvement, the connector, the intermediate rod and the piston rod (plunger) can be easily mounted and dismounted.

Drawings

FIG. 1 is an exploded view of a connecting structure of an intermediate rod and a piston rod (plunger) of a reciprocating pump;

FIG. 2 is a perspective view of a connecting structure of an intermediate rod and a piston rod (plunger) of the reciprocating pump;

FIG. 3-the top view of FIG. 2;

FIG. 4-section B-B of FIG. 3;

FIG. 5-enlarged detail D of FIG. 4;

figure 6-a comparison of the profile of the connecting structure of the intermediate rod and the piston rod (plunger) of the two reciprocating pumps.

The reference numbers are as follows:

1-middle rod, 2-connector upper part, 3-spring washer, 4-M12 screw, 5-piston rod (plunger), 6-connector lower part, 7-1600hp reciprocating pump middle rod and piston rod (plunger) connector, 8-2400hp reciprocating pump middle rod and piston rod (plunger) connector, 1.1-end surface, 1.2-external conical surface, 1.3-inner hole, 2.1-left inner conical surface, 2.2-right inner conical surface, 2.3-small plane, 2.4-inner hole, 2.5-locking upper part, 2.6-M4 screw, 2.7-clamp upper part, 3.1-upper end surface, 3.2-lower end surface, 3.3-inner hole, 4.1-thread surface, 4.2-step surface, 5.1-end surface, 5.2-external conical surface, 5.3-arc surface, 6.1-left inner conical surface, 6.2-right inner conical surface, 6.3-M12 screw hole, 6.4-lower part of lock catch, 6.5-lower part of clamp, 7.1-big bolt and 7.2-iron chain.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

The embodiments of the present invention are not limited to the following examples, and various changes made without departing from the spirit of the present invention are within the scope of the present invention.

Referring to fig. 1 to 6, the connecting structure of the intermediate rod and the piston rod (plunger) of the reciprocating pump according to the present embodiment includes an intermediate rod 1, a connector upper portion 2, a spring washer 3, an M12 screw 4, a piston rod (plunger) 5, a connector lower portion 6, a 1600hp reciprocating pump intermediate rod and piston rod (plunger) connector 7, a 2400hp reciprocating pump intermediate rod and piston rod (plunger) connector 8, an end surface 1.1, an outer conical surface 1.2, an inner bore 1.3, a left inner conical surface 2.1, a right inner conical surface 2.2, a small plane 2.3, an inner bore 2.4, a latch upper portion 2.5, an M4 screw 2.6, a latch upper portion 2.7, an upper end surface 3.1, a lower end surface 3.2, an inner bore 3.3, a threaded surface 4.1, a stepped surface 4.2, an end surface 5.1, an outer conical surface 5.2, an arc surface 5.3, a left inner conical surface 6.1, a right inner conical surface 6.2, a screw hole 6.3, a latch lower portion 6.3, a latch bolt 6.7, a large chain bolt, a latch upper portion 6.2, a latch lower end surface 6.2, an M12 screw hole 6.3, a latch lower portion 6.7, a large chain bolt, and a large chain.

Referring to fig. 1, 2, 3 and 4, the method for connecting the intermediate rod 1 and the piston rod (plunger) 5 includes: the arc surface 5.3 of the piston rod (plunger) 5 is placed in the inner hole 1.3 of the middle rod 1, the end surface 5.1 of the piston rod (plunger) 5 is attached to the end surface 1.1 of the middle rod 1, the clamp upper part 2.7 of the connector upper part 2, the clamp lower part 6.5 of the connector lower part 6 are attached to the middle rod 1 and the piston rod (plunger) 5, wherein the left inner conical surface 2.1 of the connector upper part 2 is attached to the outer conical surface 1.2 of the middle rod 1, the right inner conical surface 2.2 of the connector upper part 2 is attached to the outer conical surface 5.2 of the piston rod (plunger) 5, the left inner conical surface 6.1 of the connector lower part 6 is attached to the outer conical surface 1.2 of the middle rod 1, the right inner conical surface 6.2 of the connector lower part 6 is attached to the outer conical surface 5.2 of the piston rod (plunger) 5, the clamp upper part 2.7 of the connector upper part 2 and the lock member 6.4 are easily locked together, and two M12 are inserted through the inner hole 3.1 of the spring washer 3 of the spring washer 3.1, 3, The inner hole 2.4 of the upper connector part 2 is screwed into the M12 screw hole 6.3 of the lower connector part 6, the lower end face 3.2 of the spring washer 3 is contacted with the small plane 2.3 of the upper connector part 2, the upper end face 3.1 of the spring washer 3 is contacted with the step face 4.2 of the M12 screw 4, and the torque of 100N, M is applied, so that the upper connector part 2, the lower connector part 6, the intermediate rod 1 and the piston rod (plunger) 5 are firmly connected together.

Referring to fig. 5 and 4, the diameter of the arc surface 5.3 of the piston rod (plunger) 5 and the diameter of the inner hole 1.3 of the intermediate rod 1 are matched in a clearance fit mode, the clearance is 0-0.034 mm, the inner hole contact of the two parts is a line, the end surface 1.1 and the end surface 5.1 of the two parts are in very tight contact, and the matching can meet the requirement of easy assembly and can ensure high coaxiality precision of the two parts, namely the intermediate rod 1 and the piston rod (plunger) 5.

Referring to fig. 1, 2, 3 and 4, the method for detaching the intermediate rod 1 and the piston rod (plunger) 5 is as follows: firstly, two M12 screws 4 are easily disassembled by a pneumatic wrench, the upper lock catch part 2.5 of the upper connector part 2 and the lower lock catch part 6.4 of the lower connector part 6 are easily separated, the upper connector part 2 and the lower connector part 6 are separated, and the middle rod 1 and the piston rod (plunger) 5 are disassembled.

Referring to fig. 2 and 3, when the M12 screw 4 is screwed and loosened, the upper connector part 2 and the lower connector part 6 are easily connected together by the upper locking part 2.5 and the lower locking part 6.4, and the middle rod (1) and the piston rod (plunger) (5) are safely, reliably and easily assembled and disassembled.

Referring to fig. 5 and 4, since the circular arc surface 5.3 of the piston rod (plunger) 5 and the inner hole 1.3 of the intermediate rod 1 are matched in a line contact clearance fit manner, the intermediate rod 1 and the piston rod (plunger) 5 can be easily detached by shaking the piston rod (plunger) 5 up and down.

Referring to fig. 6, the connecting structure of the intermediate rod and the piston rod (plunger) of the reciprocating pump not only can ensure high coaxiality precision of 5 two parts of the piston rod (plunger) of the intermediate rod 1 and is easy to install and disassemble, but also can greatly reduce the weight of the connector, the total weight of the intermediate rod and the piston rod (plunger) connector 8 of the 2400hp reciprocating pump is 25kg, the total weight of the intermediate rod and the piston rod (plunger) connector 8 of the 2400hp reciprocating pump is only 3.83kg, and the material saving ratio is 84.68%.

The above detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art, and these changes are within the protection of the present invention and also within the protection scope of the present invention.