Design and calculation of structural design of non-hydraulic balanced supercharged water-injection pump Dai Zhigang (Dagang Oilfield Group Zhongcheng Machinery Manufacturing Co., Ltd.) design is: (1) adopts horizontal straight-through pump head, and pump head pressure 50 MPa average life exceeds 5a; (2) The power end of the connecting rod is equipped with a needle roller bearing to balance the pressure on the small end of the connecting rod. It is not necessary to consider the influence of the inlet and outlet pressure changes on the balance rate, and the range of use of the pump is more extensive; (3) Eliminating the balance tube eliminates over-positioning and installation, reduces punctures, and thus enhances the reliability of the pump. (4) The new pump has a short packing box and requires only 1 set of sealing devices, reducing the number of wearing parts - half, dismounting disks Root is more convenient. In the field test, the new pump inlet pressure 18MPa, outlet pressure 44MPa crankcase temperature from the conventional 74 °C down to 50 workers plunger life than the conventional pump plunger to improve the safe operation of 2 PUMPS 7000h no exception.
Dai Zhigang, an engineer, was born in 1970. He graduated from Hefei University of Technology in 1993 with a major in mechanical manufacturing. He is currently working on the design of reciprocating pumps and is the director of technology. Address: (300280) Dagang District, Tianjin. Tel: (022) At present, the conventional supercharged water injection pumps used in China's oil fields adopt the principle of hydraulic equilibrium and supercharging. They need to be equipped with balance tubes. The pump heads are mostly used with up and down straight-through structures, and the suction valves and discharge valves are arranged up and down steps. The plug hole is set perpendicular to it. The pump head pressure alternating cavity has intersecting holes. When the pump is working, the pressure difference of the liquid pressure in the pressure alternating chamber is up to 40 MPa or more, and changes several hundred times per minute. Under such frequent alternating pressure, the parts with large stress of the pump head are generally at the intersection of the two intersecting holes. , easy to produce micro-cracks. A large number of facts have proved that the existence of cross-intersection holes in the conventional pump head is the root cause of cracking of the pump head.
Aiming at the above problems of the conventional supercharged water injection pump, a non-hydraulic balanced supercharged water injection pump was designed.
The design of a non-hydraulic balanced booster injection pump design shows a newly designed non-hydraulic balanced injection pump head structure. The pump uses a horizontal integral pump head. Liquid is sucked from the two suction ports. The suction valve plate is opened and the liquid flows into the suction spring seat. It can be seen that an alternating chamber is formed in the suction spring seat. When the plunger advances, the suction valve piece is closed, the discharge valve piece is opened, high-pressure water flows into the pressure flange, and flows out through the discharge port. It can also be seen that both the high-pressure water flow and the alternating water flow act on the suction spring seat and the compression flange. The pump head does not have intersecting holes in the high-pressure alternating cavity, and the pump head indirectly bears the pressure and is uniform in the circumferential direction. The distribution reduces the stress concentration in the cross hole. Compared with the conventional booster pump, the pressure bearing capacity is improved much, and the average service life of the booster pump is more than 5 a up to 50 MPa. This completely solves the problem that the conventional booster pump has a short service life when the pressure exceeds 35 MPa.
After the installation of the conventional pressurized injection pump pump head and packing box, the installation of the balance tube is over-positioned. If the installation is not correct, the balance tube may generate torsion and be easily leaked. Therefore, high machining accuracy is required.
The new non-hydraulic balanced booster pump eliminates the over-positioning balance tube of the conventional booster pump. Since the over-positioning installation is eliminated, the leakage is reduced, thereby enhancing the reliability of the booster pump.
2 Valve body structure design and layout The more valve groups, the greater the probability of failure; and when troubleshooting, it is not easy to find the cause of the failure. When the upper and lower structural valve groups are used, if the lower valve group is damaged, the upper valve group must be removed before maintenance to remove the lower valve group, which is very tedious.
Intake and discharge of combination valves that share a single valve body, with only one valve group in each chamber. The three-cylinder pump only has three valve groups, which reduces three valve groups compared with the conventional booster pump, reducing the cost of processing and maintenance, and at the same time reducing the maintenance workload. When replacing the valve body, only the front clamping flange needs to be removed. The valve body can be removed or replaced, which is very convenient.
It can be seen that the new booster pump packing box is short, only 1 set of sealing device is needed, and the wearing parts are relatively reduced by half. The packing and packing is very convenient. Just unscrew the packing box gland and the packing will be Pump head residual pressure and spring thrust push it out, so that it is easy to replace the packing.
Non-hydraulic balance booster pump power end of the connecting rod adopts needle roller bearing. Although the connecting rod small head performs swinging motion, the needle roller bearing's needle roller performs circular motion, each roller needle can be fully lubricated, so the Parts are no longer vulnerable parts. In addition, due to this structure, as long as the imported thread strength is sufficient, the inlet pressure can reach 30-40 MPa, which is not achieved by the conventional booster pump.
The new non-hydraulic balanced booster water injection pump does not require a stepped plunger to generate a balance force to reduce the pressure of the connecting rod small head. It uses a needle roller bearing to balance the pressure on the small end of the connecting rod, but after the balance force is removed, the cross As the head assembly is subjected to increased forces, two sets of needle roller bearings are installed on each connecting rod under the existing space conditions. By calculation, two sets of needle roller bearings can fully withstand the pressure of the pump.
As the balance force is cancelled, its consumed power is increased. The increased power is the increased power of the inlet fluid, ie, the increased power is equal to the product of the inlet pressure and the liquid flow, and the increased power of this part must be considered when calculating the power.
The use of no need to consider the impact of changes in inlet and outlet pressure on the balance, so the application of non-hydraulic balance booster pump is more extensive.
Field test results In November 2002, a non-hydraulic balanced supercharged water injection pump was used for industrial field tests at the No. 4 Oil Production Plant in Zhongyuan Oilfield. After testing, the inlet pressure 18MPa outlet pressure 44MPa plunger diameter 35mm, flow rate 7.1m3 / h, crankcase temperature from the conventional booster pump to 74 °C down to about 50 °C, safe operation 7000h, no abnormalities were found. The plunger life of the new booster pump has been increased by 2 compared to the original life. This is due to the fact that the plunger of the non-hydraulic balanced booster pump has only one set of packing, the friction is reduced, and the wear part is less, so the service life is increased. The original hydraulic balance booster pump connecting rod small copper sleeve is usually replaced 2000~3000h one time, and the non-hydraulic balancing booster pump connecting rod small head is a needle roller bearing and can continue to be used after running 7000h.
(This article edited by Wang Zhiquan) (Continued from page 16) said that the tensile strength is 1 API standard reducer specifications a total of 18 kinds, its rated kNm, while the domestic reducer specifications only 12 kinds, its rated torque 28~146kN°m For this reason, this design adds a speed reducer of 4 5kN°m, so the specification of the speed reducer reaches 13 kinds, basically can meet the production demand of the oil field.
Each pumping unit has bracket bearing seats, tail bearing seats and crank pin bearing seats. There are 5 models and different specifications of bearing seats according to the different models of the pumping unit. For details, see 3. Up to now, 63 API series. The basic parameters of the conventional pumping unit, the dimensions of the four-bar linkage, its two-dimensional sketching structure, and three-dimensional modeling were all designed. The next step is to divide the modules and finally assemble them. According to different basic parameters, different pumping units are assembled to complete the design of all 63 API series conventional pumping units.
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