PCY14-1B Inclined Plate Type Constant Pressure Variable Displacement Plunger Pump
CY14 Type AxialPiston pumpIt is an axial plunger pump using a distributing oil plate and cylinder rotation. Due to the hydraulic static balance structure between the sliding shoe and variable head, as well as between the distributing oil plate and cylinder, it boasts advantages such as simple structure, compact size, high efficiency, long service life, light weight, and strong self-priming ability compared to other types of pumps. It is suitable for machine tools, forging, metallurgy, engineering, mining machinery, and other hydraulic transmission systems. This pump can also be used as a hydraulic motor by simply replacing the motor with a distributing oil plate.
Model Description
63SCY14-1B has a nominal flow rate of 63L/min at 1000r/min, manually variable in the forward rotation, cylinder rotationAxial Piston Pump(B-Type Drawing)
Series specifications
Terms of Use
Axial plunger pumps are a precision component, and their proper use directly impacts the pump's lifespan. Therefore, all users must strictly follow the requirements below to correctly operate the pump.
1. Installation
(1) The oil pump can be mounted with a bracket or flange. The pump and the prime mover should share a common foundation bracket. The bracket, flange, and foundation should all have sufficient rigidity to prevent vibration during operation. For pumps with flow rates of 160L/min or more, due to the higher power of the prime mover, it is recommended not to install them on the oil tank.
(2) The concentricity error between the pump's drive shaft and the prime mover's output shaft, as well as the alignment method, are as follows:
A. Bracket Installation: The method for checking the installation accuracy between the prime mover output shaft and the bracket is shown in Figures 12-1 and 12-2.
B. Flange Installation: In this type of installation, if the prime mover is connected to the pump with a coupling, the installation precision checking method is the same as shown in the above figure. If the pump shaft is directly inserted into the output shaft of the prime mover, refer to Figures 13-1 and 13-2 for the installation precision checking method.
Verticality error: 0.05
(R represents the diameter of the circle of the pump mounting hole distribution)
(3) It is recommended to use a flexible coupling between the pump and the prime mover drive shaft as much as possible. Since the pump drive shaft cannot withstand bending torque, it is strictly forbidden to install a belt or gear to drive the oil pump on the pump shaft. If it is absolutely necessary to connect the belt or gear to the pump, it is suggested to add a bracket for the belt or gear installation (Figure 14).
(4) The rotation direction of the oil pump is as indicated by the pump's label. If the rotation direction is not specified during ordering, the supply will be made in a clockwise direction (as viewed from the shaft end). To change the pump's rotation direction, please contact the manufacturer.
(5) The installation of the oil pump should consider ease of maintenance, allowing the variable housing to be easily removed for convenient extraction of the cylinder and oil distribution plate inside the pump.
2. Fuel Tank Design
Due to the pump's structure using static hydraulic bearings, strict attention must be paid to prevent oil contamination. The design of the oil tank significantly impacts oil contamination. The hydraulic pipes should be thoroughly cleaned before installation, typically involving acid washing and neutralization treatment; cleaning should be done after welding to ensure pipe cleanliness; the oil tank design must be sealed to prevent continuous contamination.
Figure 14: Installation Methods for Pumps Driven by Belt Pulleys or Gears
Fuel Tank Design Key Points:
The fuel tank capacity should be three times the total flow rate per minute of all pumps in an open-loop system. In a closed-loop system, the tank capacity can also be referenced by the aforementioned principle, but the flow rate of the oil pump can be considered based on the flow rate of the refueling pump. For systems with accumulators, the fuel tank should be able to accommodate the return flow of the accumulator. Additionally, the tank capacity should also consider the system's heat generation. If there are no strict requirements for the device's volume and weight, to enhance cooling efficiency, the tank capacity can be appropriately increased.
To prevent continuous oil contamination, the oil tank must be strictly sealed. Oil that leaks from the valve and pipes onto the tank lid must not flow back into the tank. The internal tank is connected to the atmosphere through an air filter. The air filter must be cleaned simultaneously when cleaning the oil tank. The pipes inserted into the tank must be tightly sealed to the tank's top cover to prevent dust from entering.
The normal operating temperature for this pump is 10 to 65°C. If the temperature exceeds this range during use, a heating or cooling device must be installed in the hydraulic system.
3. Filter
The cleanliness of the working oil significantly affects the lifespan of the oil pump. Baffles should be installed inside the housing to eliminate air bubbles during the return oil process, equipped with 80 mesh screens. The hydraulic system should have a fine filter with a particle size of 15μ to 20μ in the return oil section to maintain the cleanliness of the system oil. (Do not install a fine filter on the pump's leakage oil pipe to prevent an increase in the housing cavity pressure, which could cause oil leakage at the skeleton seal. The pump's intake pipe should not have an oil filter to avoid increasing the suction resistance.)
In addition to the requirements mentioned above, users must pay special attention to:
(1) Before installation and trial run, the oil tank, pipelines, cylinders, valves, etc., must be thoroughly cleaned. When refilling the oil tank with new oil, it is also necessary to filter the oil using an oil filter to prevent contamination of the oil due to unclean oil drums.
(2) After one week of use, the new pump requires a complete oil filter change, along with cleaning the oil tank and filter. Subsequently, based on the machine's workload, filter the oil with a 15μ to 20μ filter every 3 to 6 months or replace the oil and clean the oil tank.
(3) Absolutely no opening of the oil tank lid or oil filling hole is permitted during operation due to system heating.
4. Self-priming and piping
When installing the oil pump, it is recommended to position the oil level in the tank above the pump's inlet as much as possible. For pumps with flow rates less than 160L/min, they can be installed on the tank for self-priming. For pumps with flow rates above 160L/min, back-priming for self-priming should be used. The diameter of the suction pipe should not be smaller than the recommended value, and the diameter of the shut-off valve should be one size larger than the inlet pipe. The distance H1 from the end of the inlet pipe to the side wall of the tank should be greater than 3D, and the distance H to the bottom of the tank should be greater than 2D; no more than two elbows should be used. Both the suction pipe and the leak pipe must be below the oil level of 200mm in the tank to prevent air from entering.
(1) Self-priming installed on the fuel tank (Fig. 15)
a. The center height to the lowest oil surface of the oil pump does not exceed 500mm.
b. Oil filters are not permitted to be installed on the intake pipe.
c. If the oil pump requires a reduced deviation angle for startup, it cannot guarantee self-priming (If the user needs a lower flow rate during operation, they should adjust the flow rate using a variable mechanism after the pump starts at full deviation angle).
(2) Siphon Feed (Fig. 16)
a. The distance from the low fuel level in the fuel tank to the center of the fuel pump should be ≥300, and the pump can start self-priming with a slight angle deviation.
b. The intake pipe length of the oil pump is less than 2500mm.
(3) Self-priming vertical-mounted oil pump (Fig. 17)
a. The distance from the oil pump intake to the lowest oil level shall not exceed 500mm.
b. The filling connector on the leaking oil pipe should be higher than the oil pump bearing lubrication line (end cover flange).
5. Oil tube connection method for leakage
(1) The oil leak outlet must be directly connected to the oil tank and must not be connected to the system pipeline.
(2) When the pump frequently operates at zero skew angle or the system working pressure is below 8MPa, causing excessive leakage and resulting in the pump body heating up, cooling measures can be considered. A branch pipe can be分流 from the system return oil pipe and directed into the leakage oil outlet at the bottom of the oil pump for forced circulation cooling (as shown in Figure 18). The oil pressure within the casing should be less than 0.05MPa.
(3) When using an overpressure oil tank due to the requirement of the hydraulic system, the pressure should not exceed 0.05 MPa.
6. Working Medium
(1) Recommend using domestic N32-46 hydraulic oil, or other hydraulic oils with an E50 viscosity index of 3-5 and greater than 90. The moisture, ash content, and acid value of the oil must comply with the relevant specifications for hydraulic oils.
(2) The normal operating oil temperature for this pump is 10~65°C. If 10# aviation hydraulic oil is used, the cooling system must perform well.
7. Initiate
(1) Check the correct and reliable installation of the oil pump, ensure the coupling is properly fitted, and manually rotate the coupling to verify if the pump shaft rotates evenly. Also, inspect whether the two couplings are coaxial and if there is the necessary axial clearance.
(2) Prior to initial use or after long-term storage, it is mandatory to fill the pump with clean working oil through the leak oil port on the pump housing before starting. Failure to do so is prohibited! Check the pump's rotation direction before starting!
(3) Adjust the system's pressure relief valves to low settings, and strictly prohibit starting with any load!
(4) Start the pump with a momentary activation, then run it continuously after normal oil output. After running for a certain period without any malfunctions, gradually adjust to the desired pressure and flow rate. The safety valve in the hydraulic system should not be adjusted to a pressure exceeding 35MPa.
(5) Upon reactivation after being out of service for three months or more, the pump should be operated at no load for half an hour first. If abnormal temperature rise, leakage, vibration, or noise is detected during operation, the pump should be immediately stopped for inspection.
8. Operation under Load
(1) Low-load Operation: After completing the aforementioned preparatory work, start the pump and run it under a pressure of 1~2 MPa for half an hour.
(2) Full Load Operation: After the low load operation is completed, gradually adjust the pressure of the overflow valve and safety valve to the high pressure of the hydraulic system and run for 15 minutes. Check if the hydraulic system is operating normally. The high temperature on the pump housing is generally 10~15℃ higher than the oil temperature at the pump inlet inside the oil tank. When the oil temperature inside the oil tank reaches 65℃, the high temperature on the pump housing should not exceed 75~80℃. After the load operation is completed, the pump can enter normal operation.
(3) When stopping the oil pump, it should be unloaded first, then turned off.
Structural Section
The tilting disc in the metering mechanism is always fixed on the metering end cover, and the stroke of the plunger cannot be altered, thus its flow rate is fixed.
Fault Handling
Operating Principle
Axial piston pumps utilize a distributing plate for oil distribution, with the cylinder rotating and powered by a variable swashplate. These pumps feature a hydraulic static equilibrium design for the oil film thickness, ensuring the cylinder operates with the distributing plate and the sliding shoe with the variable head in pure liquid friction, offering advantages such as simple structure, compact size, low noise, high efficiency, long lifespan, and self-priming capability.
The CY14-1B series pumps are axial plunger pumps that utilize cylinder rotation and variable heads (tilting disks) for variable flow. Thanks to the hydraulic static equilibrium oil film thickness design between the sliding shoe and variable head, and between the oil distribution plate and cylinder, these two pairs of moving surfaces operate under pure liquid friction. This eliminates the need for heavy thrust bearings, resulting in advantages such as simple structure, compact size, high efficiency, light weight, low noise, long service life, and strong self-priming capability. They are suitable for hydraulic equipment in forging machinery, machine tools, ships, aviation, metallurgical machinery, plastic machinery, construction machinery, and mining machinery, among others.
Power Calculation
N = QP / (60η) (Kw) Actual motor power used
Q - Flow Rate (Actual Usage Flow Rate) L/min
P — Pressure MPa (Actual Operating Pressure)
η - Total Efficiency Available: 0.85
Users can select the motor after calculating the actual load as per the formula listed above.
Dimensions (外观尺寸)
MCY (M) 14-1B Axial Piston Pump (Illustrated as a clockwise pump; the oil inlet and outlet of the reverse pump are opposite to those of the clockwise pump)
