WO2021035521A1

WO2021035521A1 - Linear electric motor-driven plunger pump

Info

Publication number: WO2021035521A1
Application number: PCT/CN2019/102782
Authority: WO
Inventors: 崔海萍; 王继鑫; 李海龙
Original assignee: 烟台杰瑞石油装备技术有限公司
Priority date: 2019-08-27
Filing date: 2019-08-27
Publication date: 2021-03-04

Abstract

A linear electric motor-driven plunger pump, comprising a linear electric motor (1) and a hydraulic end assembly. The hydraulic end assembly comprises a plunger (2), a valve box (3), an upper valve (4), and a lower valve (5). A plunger hole (35), a suction hole (34), and a discharging hole (33) are provided on the valve box (3). The plunger (2) is provided in the plunger hole (35). The upper valve (4) is sealedly mounted in the discharging hole (33). The lower valve (5) is sealedly mounted in the suction hole (34). The linear electric motor (1) drives the plunger (2) to make a linear reciprocating movement in the plunger hole (35) of the valve box. The linear electric motor is connected to the plunger of the hydraulic end assembly via a connecting assembly. With the linear electric motor driving the plunger pump and with the pattern of motion of the components being controlled by controlling the pattern of motion of the linear electric motor, a shortcoming of an existing plunger pump is overcome, thus maximizing the advantages of the plunger pump.

Description

Plunger pump driven by linear motor

Technical field

The invention relates to the technical field of plunger pumps, in particular to a linear motor driven plunger pump.

Background technique

Traditional plunger pumps generally convert the rotary motion of the prime mover into linear reciprocating motion of the plunger through a crank connecting rod mechanism, so that the liquid is intermittently sucked into the pump cylinder and discharged out of the pipeline at high pressure to achieve the purpose of conveying liquid. This kind of rotary drive plunger pump has the following problems: the traditional rotary drive plunger pump has many intermediate transmission links, high friction and wear, and low system efficiency; complex structure, difficult manufacturing and processing, high cost, many vulnerable parts, and failure There is a high probability of high pressure, and maintenance is inconvenient; the plunger speed varies greatly, the displacement of the plunger pump fluctuates, and the discharge pressure is unstable; limited by the structure of the power end of the traditional crankshaft connecting rod, it is difficult to achieve long stroke, low stroke, and large displacement. High-quantity operation requirements; complex structure, large friction and wear, and large pressure fluctuations, resulting in low life of wearing parts and serious vibration and noise during operation.

Summary of the invention

The purpose of the present invention overcomes the shortcomings of the prior art, and provides a linear motor-driven plunger pump. The plunger pump is driven by a linear motor, and the movement law of the linear motor is controlled to control the movement law of the assembly, thereby overcoming the current column The shortcomings of the plug pump, maximize the advantages of the plunger pump.

The purpose of the present invention is achieved through the following technical measures: a linear motor driven plunger pump, including a linear motor and a hydraulic end assembly, the linear motor is connected to the hydraulic end assembly, the hydraulic end assembly includes The plunger, the valve box, the upper valve body and the lower valve body, the valve box is provided with a plunger hole, a suction hole and a discharge hole, the plunger is arranged in the plunger hole, and the upper valve body is sealed in In the discharge hole, the lower valve body is sealed and installed in the suction hole, and the linear motor drives the plunger to make linear reciprocating motion in the plunger hole of the valve box. The linear motor is connected to the hydraulic end assembly through the connecting assembly. Connected into plunger.

Further, the connection assembly includes a plunger connector, a support rod, and a mover connector, one end of the support rod is connected to the plunger connector, and the other end of the support rod is connected to the mover connector, so The other end of the plunger connector is connected with the plunger, and the other end of the mover connector is connected with the mover of the linear motor.

Further, the linear motor is a single-acting linear motor.

Further, the valve box is a single-cylinder combined valve box or a multi-cylinder valve box.

Further, the single-cylinder combined valve box includes a two-cylinder combined valve box, a three-cylinder combined valve box, a four-cylinder combined valve box, a five-cylinder combined valve box, a six-cylinder combined valve box, and a seven-cylinder combined valve box. A plunger hole, a suction hole and a discharge hole are opened on each cylinder of the single-cylinder combined valve box, the plunger is arranged in the plunger hole, and the upper valve body is sealed and mounted on the In the discharge hole, the lower valve body is sealed and installed in the suction hole.

Further, the multi-cylinder valve box includes a two-cylinder valve box, a three-cylinder valve box, a four-cylinder valve box, a five-cylinder valve box, a six-cylinder valve box, and a seven-cylinder valve box. Each cylinder of the multi-cylinder valve box The upper part is provided with a plunger hole, a suction hole and a discharge hole, the plunger is arranged in the plunger hole, the upper valve body is sealed and installed in the discharge hole, and the lower valve body is sealed and installed with the suction hole. Inside.

Compared with the prior art, the beneficial effects of the present invention are: to solve the problem of the traditional plunger pump, the linear motor can directly convert the electrical energy into the mechanical energy of linear motion, omit the intermediate transmission link, reduce the friction and wear, and the system efficiency is high. , It has the advantages of simple structure, non-contact movement, low noise, convenient maintenance, high reliability, long life, and can meet the operation requirements of long stroke, low stroke and large displacement.

The present invention will be described in detail below with reference to the drawings and specific embodiments.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the hydraulic end assembly of the present invention;

2 is a schematic diagram of the structure of a plunger pump driven by a single-acting linear motor of the present invention;

3 is a schematic diagram of the combined structure of the five-cylinder combined valve box in the first embodiment of the present invention;

4 is a schematic diagram of the combined structure of the five-cylinder valve box in the first embodiment of the present invention;

Figure 5 is a schematic diagram of the structure of a plunger pump driven by a double-acting linear motor of the present invention;

6 is a schematic diagram of the combined structure of the five-cylinder valve box in the second embodiment of the present invention;

7 is a schematic diagram of the combined structure of the five-cylinder combined valve box in the second embodiment of the present invention;

Figure 8 is a schematic view of the structure of the single-acting plunger pump driving two hydraulic end assemblies of the present invention;

9 is a schematic diagram of the combined structure of the five-cylinder combined valve box in the fifth embodiment of the present invention;

Figure 10 is a schematic diagram of the combined structure of the five-cylinder valve box in the sixth embodiment of the present invention

Among them, 1, single-acting linear motor, 2, plunger, 3, valve box, 31, single-cylinder combined valve box, 32, multi-cylinder valve box, 33, discharge hole, 34, suction hole, 35, plunger hole , 4. Upper valve body, 5. Lower valve body, 6. Plunger connector, 7. Support rod, 8. Mover connector, 9. Double-acting linear motor.

detailed description

As shown in Figures 1 to 10, a linear motor-driven plunger pump includes a linear motor and a hydraulic end assembly. The linear motor is a single-acting linear motor 1 or a double-acting linear motor 9. The hydraulic end assembly is connected. The hydraulic end assembly includes a plunger 2, a valve box 3, an upper valve body 4, and a lower valve body 5. The valve box 3 is a single-cylinder combined valve box 31 or a multi-cylinder valve box 32 . The single-cylinder combined valve box 31 includes a two-cylinder combined valve box, a three-cylinder combined valve box, a four-cylinder combined valve box, a five-cylinder combined valve box, a six-cylinder combined valve box, and a seven-cylinder combined valve. box. The multi-cylinder valve box 32 includes a two-cylinder valve box, a three-cylinder valve box, a four-cylinder valve box, a five-cylinder valve box, a six-cylinder valve box, and a seven-cylinder valve box. Each cylinder of the valve box 3 is provided with a plunger hole 35, a suction hole 34, and a discharge hole 33. The plunger 2 is provided in the plunger hole 35, and the upper valve body 4 is sealed and mounted on the discharge hole. In the hole 33, the lower valve body 5 is sealed and installed in the suction hole 34. The linear motor drives the plunger 2 to make a linear reciprocating movement in the plunger hole 35 of the valve box 3, so as to realize the suction and discharge of liquid and realize the pumping operation. The structure is simple and the maintenance is convenient. Compared with the traditional crankshaft and connecting rod crosshead plunger pump, the linear motor drives the plunger pump, eliminating the need for an intermediate conversion mechanism that converts rotary motion to linear motion. The overall structure is greatly simplified and saved Cost, reduce the volume, make the maintenance of the plunger pump more convenient. The transmission rigidity is large, and it is directly driven, which avoids the hysteresis caused by the elastic deformation, friction and wear and backlash of the intermediate transmission link when starting, shifting and reversing, and greatly improves the transmission rigidity; the stroke length is not limited, and the straight line is used Driven by the motor, the plunger stroke can be set according to the needs, which can realize the long stroke, large displacement, low sprint and high pressure of the reciprocating pump, greatly improving the service life of its valve box, plunger, valve and seal; high efficiency and response Fast, because there is no intermediate transmission link, there is no influence of inertia and resistance of the intermediate transmission mechanism, which eliminates the energy loss during mechanical friction and improves the transmission efficiency. The direct transmission of the linear motor has fast response speed, high sensitivity and good follow-up. High accuracy; eliminates the mechanical friction of the components, greatly reduces the noise during movement, and improves the current situation of high noise in the existing equipment; multiple units can be connected in parallel without interfering with each other. When multiple linear motors work, the total thrust is equal to each motor The sum of thrust does not interfere with each other, and there are no problems such as load imbalance when multiple units are used together. The assembly flexibility is large, and it can meet different working conditions and different installation requirements.

The connection between the linear motor and the hydraulic end assembly can be roughly divided into the following two types: the mover of the linear motor is directly connected to the plunger 2 in the hydraulic end assembly or the mover of the linear motor is connected to the hydraulic end assembly through the connection assembly. The plunger 2 in the hydraulic end assembly is connected.

The connecting assembly includes a plunger connector 6, a support rod 7 and a mover connector 8. One end of the support rod 7 is connected to the plunger connector 6, and the other end of the support rod 7 is connected to the mover connector. 8 is connected, the other end of the plunger connector 6 is connected to the plunger 2, and the other end of the mover connector 8 is connected to the linear motor.

The single-acting linear motor 1, the double-acting linear motor 9, the single-cylinder combined valve box 31 and the multi-cylinder valve box 32 are combined to form different linear motor-driven plunger pump implementations.

Implementation column 1

The linear motor-driven plunger pump includes a single-acting linear motor 1, a plunger 2, a multi-cylinder valve box 32, an upper valve body 4, and a lower valve body 5. The single-acting linear motor 1 and the plunger 2 are directly connected to each other. In connection, the mover of each linear motor drives a plunger 2 individually. In this embodiment, 2-7 linear motors can be used in combination. The number of valve boxes 3 cylinders of the multi-cylinder valve box 32 is the same as the number of linear motors.

Implementation column 2

The linear motor-driven plunger pump includes a single-acting linear motor 1, a plunger 2, a single-cylinder combined valve box 31, an upper valve body 4, and a lower valve body 5. The linear motor is directly connected to the plunger 2 and each The mover of a linear motor drives a plunger 2 separately. This embodiment can be combined with 2-7 single-acting linear motors 1 according to requirements. The single-cylinder combined valve box 31 has 3 valve boxes and single-acting linear motors. The number of 1 is the same.

Implementation column 3

The linear motor-driven plunger pump includes a double-acting linear motor 9, a plunger 2, a single-cylinder combined valve box 31, an upper valve body 4, and a lower valve body 5. The left and right ends of the mover of the double-acting linear motor 9 are respectively One plunger 2 is directly connected, and each double-acting linear motor 9 alternately drives the plunger 2 on the left and right sides. In this embodiment, 1-4 double-acting linear motors 9 can be combined according to requirements. The single-cylinder combined valve box 31 The number of 3 valve boxes is twice the number of 9 double-acting linear motors.

Implementation column 4

The linear motor-driven plunger pump includes a double-acting linear motor 9, a plunger 2, a multi-cylinder valve box 32, an upper valve body 4, and a lower valve body 5. The left and right ends of the mover of the double-acting linear motor 9 are directly connected respectively One plunger 2, each double-acting linear motor 9 alternately drives the plunger 2 on the left and right sides. In this embodiment, 1-4 double-acting linear motors 9 can be used for combination according to requirements. The multi-cylinder valve box 32 has 3 valve boxes. It is twice the number of 9 double-acting linear motors.

Implementation column 5

The linear motor-driven plunger pump includes a single-acting linear motor 1, a plunger 2, a multi-cylinder valve box 32, an upper valve body 4, and a lower valve body 5. The mover of the single-acting linear motor 1 is connected to the hydraulic The plunger 2 in the force end assembly is connected. The plunger connector 6 in the connecting assembly is connected to a plunger 2 on the left and right sides. The mover connector 8 in the connecting assembly is connected to a single-acting linear motor. 1 The mover is connected, through the single-acting linear motor 1 reciprocating to drive the connection assembly to move left and right, and then the left and right side plungers are alternately driven. This embodiment can be combined with 1-7 single-acting linear motors 1 according to the needs. The number of valve boxes of the multi-cylinder valve box 32 is twice the number of single-acting linear motors.

Implementation column 6

The linear motor-driven plunger pump includes a single-acting linear motor 1, a plunger 2, a single-cylinder combined valve box 31, an upper valve body 4, and a lower valve body 5. The single-acting linear motor 1 mover is connected to the The plunger 2 in the hydraulic end assembly is connected. The plunger connector 6 in the connecting assembly is connected to a plunger 2 on the left and right sides. The mover connector 8 in the connecting assembly is connected to the single-acting straight line. The motor 1 is connected to the mover, and the single-acting linear motor 1 drives the connection assembly to move left and right through the reciprocating motion, and then the plunger 2 on the left and right sides are alternately driven. This embodiment can be combined with 1-7 single-acting linear motors 1 according to the needs. , The number of 3 valve boxes of the single-cylinder combined valve box 31 is twice the number of 9 double-acting linear motors.

The linear motors include but are not limited to: DC linear motors, AC linear motors, linear asynchronous motors, linear synchronous motors, linear stepping motors.

Those skilled in the industry should understand that the overall technology of the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention There will be various changes and improvements, and these changes and improvements fall within the scope of the claimed invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

A linear motor-driven plunger pump is characterized in that it comprises a linear motor and a hydraulic end assembly, the linear motor is connected to the hydraulic end assembly, and the hydraulic end assembly includes a plunger, a valve box, and an upper valve. The valve box is provided with a plunger hole, a suction hole and a discharge hole, the plunger is arranged in the plunger hole, and the upper valve body is sealed and installed in the discharge hole. The lower valve body is sealed and installed in the suction hole, the linear motor drives the plunger to make a linear reciprocating movement in the valve box plunger hole, and the linear motor is connected to the hydraulic end assembly plunger through the connecting assembly.
The linear motor driven plunger pump according to claim 1, wherein the connection assembly includes a plunger connector, a support rod and a mover connector, and one end of the support rod is connected to the plunger connector The other end of the support rod is connected with the mover connecting piece, the other end of the plunger connecting piece is connected with the plunger, and the other end of the mover connecting piece is connected with the mover of the linear motor.
The linear motor-driven plunger pump according to claim 1, wherein the linear motor is a single-acting linear motor.
The linear motor driven plunger pump according to claim 1, wherein the valve box is a single-cylinder combined valve box or a multi-cylinder valve box.
The linear motor-driven plunger pump according to claim 1, wherein the single-cylinder combined valve box includes a two-cylinder combined valve box, a three-cylinder combined valve box, a four-cylinder combined valve box, and a five-cylinder combined valve box. Cylinder combined valve box, six-cylinder combined valve box and seven-cylinder combined valve box, each cylinder of the single-cylinder combined valve box is provided with a plunger hole, a suction hole and a discharge hole, the plunger is provided In the plunger hole, the upper valve body is sealed and installed in the discharge hole, and the lower valve body is sealed and installed in the suction hole.
The linear motor driven plunger pump according to claim 5, wherein the multi-cylinder valve box includes a two-cylinder valve box, a three-cylinder valve box, a four-cylinder valve box, a five-cylinder valve box, and a six-cylinder valve box. And a seven-cylinder valve box, each cylinder of the multi-cylinder valve box is provided with a plunger hole, a suction hole and a discharge hole, the plunger is arranged in the plunger hole, and the upper valve body is sealed and mounted on the In the discharge hole, the lower valve body is sealed and installed in the suction hole.