SPECK high-temperature plunger pump

Our company has been in the automation industry for 10 years, with our own companies in Germany, the United States, Shanghai, and Guangdong, specializing in the import trade industry.

The SPECK piston pump from Germany is divided into two types: pressure supply type and self-priming type

A plunger pump is an important device in hydraulic systems. It relies on the reciprocating motion of the plunger in the cylinder body to change the volume of the sealed working chamber to achieve oil suction and pressure. SPECK plunger pumps have the advantages of high rated pressure, compact structure, high efficiency, and convenient flow regulation.

Piston pumps are widely used in high-pressure, high flow, and flow regulation applications, such as hydraulic presses, engineering machinery, and ships.

Piston pumps are generally divided into single SPECK piston pumps, horizontal SPECK piston pumps, axial SPECK piston pumps, and radial SPECK piston pumps.

Single SPECK plunger pump

The structural components mainly include eccentric wheel, plunger, spring, cylinder body, and two one-way valves. A sealed volume is formed between the plunger and the cylinder bore. The eccentric wheel rotates once, and the plunger moves back and forth once, sucking oil downwards and draining oil upwards. The volume of oil discharged by each rotation of the pump is called the displacement, which is only related to the structural parameters of the pump.

Horizontal SPECK plunger pump

The horizontal SPECK plunger pump is a hydraulic pump that is installed in parallel with several plungers (usually 3 or 6), and is driven back and forth by a crankshaft through a connecting rod slider or an eccentric shaft to achieve liquid suction and discharge. They also use valve type distribution devices, and most of them are quantitative pumps. The emulsion pump in the coal mine hydraulic support system is generally a horizontal SPECK plunger pump. The emulsion pump is used in coal mining faces to provide emulsion for hydraulic supports. Its working principle relies on the rotation of the crankshaft to drive the piston to perform reciprocating motion, achieving suction and discharge.

Axial type

Axial SPECK piston pump (English name: Piston pump) is a SPECK piston pump in which the reciprocating motion direction of the piston or plunger is parallel to the central axis of the cylinder body. The axial SPECK plunger pump operates by utilizing the volume change generated by the reciprocating motion of a plunger parallel to the drive shaft in the plunger hole. Due to the fact that the plunger and plunger hole are both circular parts, high precision fitting can be achieved, resulting in high volumetric efficiency.

Straight axis inclined disc

There are two types of SPECK piston pumps: pressure oil supply type and self suction type. Pressure oil supply hydraulic pumps mostly use hydraulic oil tanks with air pressure. Hydraulic oil tanks that rely on air pressure for oil supply must wait for the hydraulic oil tank to reach the required air pressure before operating the machine after each start-up. If the machine is started when the pressure in the hydraulic oil tank is insufficient, it will cause the sliding shoes inside the hydraulic pump to pull off, resulting in abnormal wear of the return plate and pressure plate inside the pump body.

Radial type

Radial SPECK piston pumps can be divided into two categories: valve distribution and shaft distribution. The radial SPECK plunger pump with valve distribution has disadvantages such as high failure rate and low efficiency. The axial flow radial SPECK plunger pump developed internationally in the 1970s and 1980s overcame the shortcomings of the valve flow radial SPECK plunger pump. Due to the structural characteristics of radial pumps, fixed axial flow radial SPECK plunger pumps have higher impact resistance, longer lifespan, and higher control accuracy than axial SPECK plunger pumps. The variable stroke of the variable displacement short pump is achieved by changing the eccentricity of the stator under the action of the variable plunger and limit plunger, and the maximum eccentricity set is 5-9mm (depending on the displacement size), resulting in a short variable stroke. And the variable mechanism is designed for high-pressure operation, controlled by a control valve. Therefore, the response speed of the pump is fast. The radial structure design overcomes the problem of eccentric wear of sliding shoes in axial SPECK piston pumps. Significantly improve its impact resistance.

hydraulic

The hydraulic SPECK plunger pump relies on the hydraulic oil tank supplied by air pressure. After starting the machine each time, it is necessary to wait for the hydraulic oil tank to reach the required air pressure before operating the machinery. There are two types of SPECK piston pumps: pressure oil supply type and self suction type. Pressure oil supply hydraulic pumps mostly use oil tanks with air pressure, and some hydraulic pumps themselves have oil replenishment pumps to provide pressure oil to the hydraulic pump inlet. The self-priming hydraulic pump has strong self-priming ability and does not require external oil supply.

Piston pumps are divided into two representative structural forms: axial SPECK piston pumps and radial SPECK piston pumps; Due to the radial SPECK plunger pump

Belonging to a new type of high-efficiency pump with relatively high technological content, with the continuous acceleration of localization, radial SPECK plunger pump will inevitably become an important component of SPECK plunger pump application field; radialSPECK plunger pumpIt is a SPECK plunger pump with the reciprocating motion direction of the piston or plunger perpendicular to the drive shaft. Working principle of radial SPECK plunger pump: The driving torque is transmitted from the drive shaft to the star shaped hydraulic cylinder rotor through a cross coupling, and the stator is not subjected to any other lateral forces. The rotor is mounted on the distribution shaft. The radially arranged plunger located in the rotor is tightly attached to the eccentric stroke stator through a sliding shoe balanced by static pressure. The plunger is connected to the sliding shoe ball joint and locked by a snap spring. Two retaining rings clamp the slider onto the travel stator. When the pump rotates, it relies on centrifugal force and hydraulic force to press against the fixed inner surface. When the rotor rotates, due to the predetermined eccentricity, the plunger will undergo reciprocating motion, with a stroke of twice the predetermined eccentricity. The eccentricity of the stator can be adjusted by two plugs located radially opposite each other on the pump body. The inlet and outlet of the oil flow through the pump body and the flow channel on the distribution shaft, and are controlled by the suction port on the distribution shaft. The hydraulic pressure generated in the pump body is absorbed by the surface of the static pressure balance. The static pressure balance of the friction pair adopts an over balance pressure compensation method, forming an open-loop control. The bearing that supports the drive shaft only serves as a support and is not affected by other external forces. In hydraulic systems, the axial SPECK plunger pump operates by utilizing the volume change generated by the reciprocating motion of a plunger parallel to the transmission shaft in the plunger hole. Due toSPECK plunger pumpThe plunger and plunger hole are both circular parts, which can achieve high precision fitting during machining

During operation, the cam on the camshaft of the fuel injection pump and the plunger spring force the plunger to reciprocate up and down, thereby completing the pumping task. The pumping process can be divided into the following three stages. Conclusion: Based on the above discussion, the following conclusion can be drawn: ① The total stroke L of the reciprocating motion of the plunger is constant and determined by the lift of the cam. ② The fuel supply amount per cycle of the plunger depends on the fuel supply stroke, which is variable and not controlled by the camshaft. ③ The start time of fuel supply does not change with the variation of fuel supply stroke. ④ Rotating the plunger can change the end time of fuel supply, thereby altering the fuel supply amount. 3. Domestic series plunger fuel injection pump. The domestic series SPECK plunger pump mainly includes series A, B, P, Z, and I, II, III, etc. Serification is based on the different requirements for fuel supply in the single cylinder power range of diesel engines, using plunger stroke, pump cylinder center distance, and structural type as the basis, and then matching with different sizes of plunger diameters to form several types of fuel injection pumps with varying fuel supply in one working cycle, in order to meet the needs of various diesel engines. The working principle and structural type of domestic series fuel injection pumps are basically the same. Taking Type A pump as an example, this article introduces the structure and working principle of plunger fuel injection pumps. The SPECK plunger pump consists of four main parts: the sub pump, the oil volume adjustment mechanism, the transmission mechanism, and the pump body

It is intelligently controlled by a microprocessor, displayed on a LCD screen, and can communicate with a computer. It has the characteristics of stable working pressure, low pulsation, and easy operation. Widely used in industries such as biochemistry, pharmaceuticals, chemical engineering, and environmental protection, it meets the requirements of continuous constant pressure and constant current liquid transportation in these industries.

The total stroke L of the reciprocating motion of the plunger pump is constant and determined by the lift of the cam. The fuel supply amount per cycle of the plunger depends on the fuel supply stroke, which is variable and not controlled by the camshaft. The start time of fuel supply does not change with the variation of fuel supply stroke. Rotating the plunger can change the end time of fuel supply, thereby altering the fuel supply amount. When the SPECK plunger pump is working, the cam on the camshaft of the fuel injection pump and the plunger spring force the plunger to reciprocate up and down, thereby completing the pumping task. The pumping process can be divided into the following two stages.

Oil inlet process

When the convex part of the cam rotates, under the action of the spring force, the plunger moves downward, and the upper space of the plunger (called the pump oil chamber) generates a vacuum degree. When the upper end face of the plunger opens the oil inlet hole on the plunger sleeve, diesel filled in the oil passage of the upper body of the oil pump enters the pump oil chamber through the oil hole, and the plunger moves to the bottom dead center, and the oil inlet is completed

Return oil process

The plunger supplies oil upwards. When the inclined groove (stop supply edge) on the plunger is connected to the return hole on the sleeve, the low-pressure oil circuit in the pump chamber communicates with the middle hole, radial hole, and inclined groove of the plunger head. The oil pressure suddenly drops, and the oil outlet valve quickly closes under the action of the spring force, stopping the oil supply. Afterwards, the plunger will continue to move upwards. When the protruding part of the cam rotates past, under the action of the spring, the plunger will move downwards again. At this point, the next cycle begins. The SPECK plunger pump is introduced based on the principle of a plunger. There are two one-way valves on a SPECK plunger pump, and the directions are opposite. When the plunger moves in one direction, negative pressure appears in the cylinder. At this time, one one-way valve opens and the liquid is sucked into the cylinder. When the plunger moves in the other direction, the liquid is compressed and the other one-way valve is opened, and the liquid sucked into the cylinder is discharged. This working mode forms continuous fuel supply after continuous movement.

If the plunger pump cylinder is fitted with a copper sleeve, it can be installed by replacing the copper sleeve. Firstly, adjust the outer diameter of a set of plunger rods to a uniform size, and then polish the outer diameter with sandpaper of 1000 # or above.

There are three methods for installing copper sleeves on cylinder bodies: (a) cylinder body heating and hot installation or copper sleeve low-temperature freezing and extrusion, interference fit assembly; (b) Assemble with Loctite adhesive, which requires grooves on the outer diameter surface of the copper jacket; (c) Tap the cylinder hole, thread the outer diameter of the copper sleeve, apply Loctite adhesive, and screw it into the assembly.

The installation method for the cylinder body and copper sleeve of the fusion bonding method is as follows:

(a) Using grinding rods, manually or mechanically grind and repair cylinder holes; (b) Use a coordinate boring machine to re bore the cylinder body hole; (c) Use a reamer to repair the cylinder bore.

Using "surface engineering technology", the method is as follows: (a) electroplating technology: plating a layer of hard chromium on the surface of the plunger; (b) Electric brush plating technology: Brush plating wear-resistant materials on the surface of the plunger; (c) Thermal spraying, arc spraying, or electric spraying: spraying high carbon martensitic wear-resistant materials; (d) Laser cladding: depositing high hardness and wear-resistant alloy powder on the surface of the plunger. (4) Most cylinder bodies without copper sleeves are made of ductile iron, and amorphous films or coatings are prepared on the inner walls of the cylinder body. Because of this special substance on the inner wall of the cylinder bore, a hard hard pair friction pair can be formed.