What Is a Plunger?

The plunger pump is an important device of the hydraulic system. It relies on the reciprocating movement of the plunger in the cylinder to change the volume of the sealed working cavity to achieve oil absorption and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment.

When working, the fuel injection pump

Piston pump cylinder mounting

A plunger pump supplied by a charge pump is used. After 3000 hours of use, the operator needs to check the plunger pump 1-2 times a day to check whether the operating sound of the hydraulic pump is normal. As found

(1) Check the plunger for damage and rust, and replace it with a new one if necessary. (2) Check the fit of the plunger pair. Insert the end of the plunger into the plunger sleeve, and tilt it about 60 °. If the plunger can slide slowly under its own action, it is a good fit. (3) Check the tightness of the plunger pair. Hold the plunger sleeve with your hand and block the oil inlet on the top and side of the plunger with two fingers. Use the other hand to pull out the plunger, feel a large suction force, relax the plunger and immediately retract it to the original position, indicating that the plunger pair is well sealed, otherwise the plunger pair should be replaced. (4) Check whether the decompression ring belt of the oil outlet valve is worn or has steps or scars, and it should be replaced if necessary. (5) Check the cooperation of the oil valve pair. Use your fingers to plug the lower hole of the oil outlet valve, and press the oil outlet valve down gently with another finger. When your finger leaves the upper end of the oil outlet valve, it can spring back to its original position, indicating that the oil outlet valve pair is well sealed, otherwise The outlet valve pair should be replaced. (6) Check the tappet. The standard clearance between the injection pump body and the tappet body is 0 to 0.03mm. If it exceeds 0.2mm, the parts should be replaced. (7) Check the gap between the plunger flange and the groove of the control sleeve, which should be 0.02 ~ 0.08mm. If it exceeds 0.12mm, the control sleeve must be replaced.

Overview of Piston Pump Applications

The plunger pump is a kind of water pump, and the entire water pump industry is a typical investment-driven industry. The market demand is greatly affected by the national macro policies, especially by the macro policies of water conservancy, construction, and energy industries. Hydraulic plunger pumps are a type of plunger pumps. There are no companies in the hydraulic industry with an annual output value of more than 1 billion yuan. Even companies with an annual output value of more than 500 million yuan are very few. The total annual sales of the industry is less than one. Total annual sales. When the supporting industries do not have the ability to compete with foreign companies, the artificial control of imported products on the domestic market will be strong and careless. The fact that most of the profits of construction machinery are taken away by the supporting parts not only makes the mainframe production enterprises miserable but also helpless. Based on this situation, the funds of OEMs and other industries are constantly entering the hydraulic industry. It invested more than one billion yuan to enter the hydraulic industry. This situation will undoubtedly increase the intensity of competition within the industry and change the original industrial structure and order. The plunger pump is a typical positive displacement hydraulic machine. It is driven by a prime mover. It converts the input mechanical energy into liquid pressure energy and then inputs it into the system in the form of pressure and flow. It is the power source of the hydraulic system. Because it can transport liquids under high pressure, it is widely used in various industries in industrial production and daily life.

Market situation of plunger pump

Pumps such as plunger pumps are widely used in shipbuilding, oil extraction, and loaders. In 2008, the ship output reached 15,000 tons, and the deadweight tons accounted for 21% of the world market. By 2015, it will become the world's largest shipbuilding country. In order to ensure the normal navigation or mooring of the ship and meet the living needs of the crew and passengers, each ship must be equipped with a certain number of marine mining equipment that can play a corresponding role. Marine pumps are one of the important auxiliary machines. According to incomplete statistics, among various marine auxiliary machinery and equipment, the total number of marine pumps of various types and different uses accounts for about 20% -30% of the total marine machinery and equipment. The price of marine pumps is included in the cost of marine equipment The proportion is also relatively large. In the total construction cost, marine pumps account for about 4% -8% of the total ship equipment costs. In general, the procurement of marine pumps for a medium-sized ship or more can reach more than 10 million yuan.