A high-pressure and large-flow plunger pump

Abstract

The invention discloses a high-pressure high-flow plunger pump. The high-pressure high-flow plunger pump comprises a crankshaft, a connecting rod, a roller crosshead assembly, groove type guide rails,a plunger packing sealing assembly and inflatable ball valve assemblies, wherein the crankshaft, the connecting rod, the roller crosshead assembly and the groove type guide rails are arranged insidea box body and are connected with one another in sequence, and the plunger packing sealing assembly and the inflatable ball valve assemblies are arranged on the pump body; the groove type guide railsare fixed in the box body, and the roller crosshead assembly is arranged on the inner sides of the groove type guide rails; one end of the roller crosshead assembly is connected with the crankshaft through the connecting rod, and the other end of the roller crosshead assembly is connected with a plunger through an intermediate rod; and the plunger packing sealing assembly and a front flange are fixed on the pump body. According to the high-pressure high-flow plunger pump, the roller crosshead assembly is arranged, a filler adjusting rod free of pump halt is arranged, plunger filler is lubricated through grease, muddy fillers is injected after the plunger filler is abraded, an inflatable ball valve assembly and the like are arranged, so that the service life of easily-damaged parts of the high-pressure large-flow plunger pump is comprehensively prolonged, maintenance is convenient, efficiency is high, energy is saved, and safe and reliable operation are really achieved.

Description

technical field [0001] The invention relates to the technical field of motorized reciprocating pumps, in particular to a high-pressure and large-flow plunger pump. Background technique [0002] High-pressure and large-flow plunger pumps are used in various industries, such as oilfield water injection pumps, phosphorus removal pumps, drilling mud pumps, long-distance delivery pumps, etc. These pumps need to run continuously without stopping for a long time, which means that the reliability of the pump is required to be tall. [0003] At present, high-pressure and large-flow plunger pumps generally have large noise-mainly the impact sound of the valve, and the large impact force causes early failure of the valve; large vibration-mainly caused by the discharge pressure pulsation; the plunger Packing life is short - mainly due to plunger packing wear; power end wearing parts have short life and are difficult to replace - mainly due to sliding wear of crossheads, guide plates, c...

AI Technical Summary

Problems solved by technology

[0003] At present, high-pressure and large-flow plunger pumps generally have large noise-mainly the impact sound of the valve, and the large impact force causes early failure of the valve; large vibration-mainly caused by the discharge pressure pulsation; the plunger Packing life is short - mainly due to plunger packing wear; power end wearing parts have short life and are difficult to replace - mainly due to sliding wear of crossheads, guide plates, crosshead pins, pin sleeves, and connecting rod bushes, and replacement The power end must be completely disassembled; the lubrication of the power end of the plunger pump needs to be equipped with forced lubrication and cooling, the system is complex, and there are many fault points to be monitored; at the same time, the reliability of the intermediate rod seal to prevent lubricating oil leakage is not ideal, etc. , especially in recent years, with the development of "Internet +" intelligent control technology, the digital monitoring and intelligent control of pumps has been widely used, but the reliability of the pump is not high, the life of wearing parts is not long, the trouble-free running time is short, and the monitoring Too many points, frequent failure alarms / shutdowns (such as excessive noise alarms, excessive vibration alarms, excessive leakage alarms, pressure / flow instability alarms, high oil temperature alarms / shutdowns, low oil level alarms, etc.), on the contrary, restrict the Internet + "The promotion and application of intelligent control technology

[0004] Invention patent 201611004600.0 "A Large-Flow Plunger Pump" uses (1) a damping valve to reduce the impact noise of the valve. The contact area between the damping ring and the valve seat is limited, and the unit area of ​​the damping ring and the valve seat is limited. The force is very large, it is easy to be damaged, causing the valve to fail, and for high-viscosity medium or medium containing impurities, it is easy to block the small hole on the damping valve, making it lose the function of deformation under pressure, and the damping effect is greatly reduced

(2) The detachable crosshead upper slideway is only convenient for disassembly and assembly, and does not substantially improve the wear resistance of the force-bearing parts at the power end, such as crossheads, guide plates, crosshead pins, pin sleeves, and connecting rod tiles

(3) The high-pressure oil injection lubrication of the plunger packing slows down the wear of the plunger packing to a certain extent, but the consumption of lubricating oil is relatively large, especially after the plunger packing is worn, the consumption of lubricating oil is very obvious. Five-cylinder plunger pump (piston diameter 105mm, pump speed 210min -1 ) can consume more than 1 liter of lubricating oil per hour, and a part of the lubricating oil enters the medium and causes pollution to the medium, and a part of the leaked lubricating oil flows into the sewage pipe, causing secondary pollution and causing the leakage to exceed the standard

(4) The forced lubrication and cooling of the power end requires many monitoring points, which consumes energy and is troublesome

Invention patent 201611004600.0 "A Large Flow Plunger Pump" shows that the packing compression nut is at the rear end of the plunger (close to the power end). The tightening nut bears a lot of force), only stop the pump to adjust, and then need to start the pump to check whether the leakage meets the requirements, and stop the pump to adjust if it does not meet the requirements.

Especially for high-pressure and large-flow plunger pumps, generally equipped with high-voltage motors (voltage 6KV / 10KV), repeated start and stop of pumps will affect the power grid, which is not allowed

Invention patent 201710588373.9 "A Reciprocating Pump Optimizing the Connection between the Power End and the Liquid End" discloses the structure of adjusting the packing at the front end of the plunger. The structural design is unreasonable. The adjusting screw is affected by the alternating force of the plunger, and it is easy to deform and loosen. A locking device has to be added to prevent the adjusting screw from loosening.

However, due to the particularity of the intermediate rod seal, the sealing effect is not ideal

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