## Industrial Oil Chillers | Oil Cooling Unit

I.**Applications**

- CNC lathes, milling machines, grinding machines, broaching machines;
- CNC integrated machining center;
- Hydraulic presses, carved machines;
- Small and medium mechanical hydraulic stations and lubrication systems;
- All kinds of electric discharge machine

II.**Functions & Features**

- To keep machining accuracy subject to the changing oil temperature;
- Prevent oil from deteriorating due to high temperature, and protect the seal from aging due to high temperature.
- Maintain the viscosity of the oil and keep the machine work stably;
- The temperature can be set according to the machine body temperature to prevent thermal deformation of the mechanical structure;
- The independent industrial oil cooler has a complete sucking oil system and a separate electrical control system, so long as the oil tank is connected, it can work online with the machine tool;
- The unit is equipped with an automatic alarm function, which can prompt the user to repair the device in a specific way to avoid damage to the machine.

III.**Technical Specifications**

** **

Models | OLP-10 | OLP-25 | OLP-35 | OLP-50 | OLP-70 | OLP-100 |

Cooling Capacity (W) | 1000 | 2500 | 3500 | 5000 | 7000 | 10000 |

Rated Power (KW) | 0.85 | 1.6 | 2.1 | 2.8 | 4 | 5 |

Power Source | 380V/50HZ(Compressor 220V/50Hz) | 380V/50HZ | ||||

Current (A) | 4.2 | 7.8 | 10 | 5.6 | 7.3 | 9.5 |

Temperature Regulating Range (°C) | 5°C~35°C | |||||

Working Temperature (°C) | ≦42°C | |||||

Refrigerant | R134a/R290 | R22 | R22 | R22 | R22 | R22 |

Weight (kg) | 50 | 62.5 | 65 | 68 | 75 | 80 |

Dimension (mm) | 445 x 365 x 628 | 600 x 460 x 950 | 600 x 520 x 1000 | 530x520x1345 | 650x650x1375 | 800x800x1650 |

Oil Pump Volume（L/min; adjustable) | 10 | 10 | 25 | 25 | 32 | 32 |

Inlet /Outlet Size（customizable） | G3/8″ | G3/8″-G3/4″ | G3/8″-G3/4″ | G3/8″-G3/4″ | G1″ | G1″ |

Machine Protection | Compressor overheat protection; Short circuit protection, water temperature control, automatic monitoring and protection of oil pressure |

Remarks:

- Cooling Capacity results subject to the ambience temperature at 35°C, inlet oil temp. at 25°C and inlet oil temp. at 20°C.
- The oil suction port of the oil chiller is fitted with filter;
- This industrial oil chiller / cooling unit machine should be used in well-ventilated places free of dust, corrosive gas or debris.
- Do not use corrosive liquid;
- The operating environment is 5-42°C. The external dimensions and related parameters will be changed subject to the final customer’s request.
- Other industrial oil chiller / cooling unit specifications and sizes can be customizable upon request.

III.**Models Instruction**

__OLPR__** – XX – X**

(1) (2) (3)

(1)Serial Number:

OLPR: Industrial oil chiller / cooling unit series;

O: Oil chiller

P: Oil tank with oil pump

R: with heating system

(2)Cooling Capacity(x100W)

XX indicate cooling capacity 100x(XX)=100XX (W)

e.g. XX is 25, it indicates cooling capacity at 100W x 25=2500W

(3) X stands for updated product

IV.**Instruction on How to Choose Oil Chiller**

**1.Selection of Oil Chiller for Spindle Cooling:**

(1) Oil temperature: spindle cooling oil temperature should be about 20 ~ 30 °C (close to the ambient temperature value);

(2) Oil pressure: the required oil supply pressure for spindle cooling is about 0.3 ~ 0.5 MPa;

(3) Calculation of spindle heating power:

P heat = P motor η

P heat – spindle heat kW

P motor – spindle motor power kW

η – spindle heat loss efficiency

For general mechanical spindles, heat loss η = 5-8% can be calculated;

For high-speed spindles, heat loss η = 20 to 30% can be calculated.

Example: The power of a machine tool spindle motor is 22kW, which is an ordinary mechanical spindle. Estimate the calorific value of the machine tool spindle:

P heat=22 x (5%~8%) =1.1~1.76kW

The refrigeration capacity of OLP-25 at an oil temperature of 30°C and an ambient temperature of 30°C is 2.5 kW, which is greater than the spindle heating power of 1.76 kW, which meets the requirements. When the oil supply pressure is 0.3 MPa, the flow rate is 10 L/min.

**2.Selection of Oil Chiller for Hydraulic Station:**

(1) Oil temperature: The oil temperature of the hydraulic station should be around 30-50°C (ambient temperature is about 30°C);

(2) Oil pressure: the pressure required by the hydraulic station cooling cycle is about 0.3 ~ 0.5MPa;

(3) Calculate the heating power according to the pump power of the hydraulic station:

P heat = P motor · η1 · η2 · η3

P Heat – Heat kW

P Motor – Hydraulic Station Total Motor Power kW

η1 – shaft efficiency, value 70% to 80%

η2 – Motor load ratio, value based on different operating conditions

η3 – heat loss efficiency, value 70% to 85%

For a hydraulic station where the hydraulic pump is continuously operating at a high pressure, the value of η is taken as the upper limit value.

Example: The pump power of a certain hydraulic station is 5 kW. After working for 20 minutes and stopping (or standby in low pressure) for 10 minutes, the heat output is:

P heat = P motor η1·η2·η3 =5×80 %×( 20/30) ×80%=2.13 Kw

The OLP-25 cooling capacity is 2.5kW, which is greater than the heating power 2.13kW, to meet the requirements;

(4) Calculate heat power based on the oil tank temperature rise rate

P heat = CP · ρ · Vs · ΔT/t

P thermal heating power kW

1kW=860kcal/h, 1 kcal/h=1.16×10-3 kW

CP: constant specific heat capacity kJ/kg·°C, constant specific heat capacity of hydraulic oil 1.9674 kJ/kg·°C

ρ: specific gravity (density) kg/L, the specific gravity of cooling oil is 0.876 kg/L

Vs: total oil L

ΔT: temperature rise °C

T: time S

Example: The total oil volume of a hydraulic station is 200L. In normal operation, the oil temperature rises from 25°C to 35°C in 10 minutes. The heat output of the hydraulic station is:

P heat = CP · ρ · Vs · ΔT/t = 1.9674 × 0.876 × 200 × (35-25) / (60 × 10) = 5.745 kW

According to the selection principle of the cooling machine: the cooling capacity of the oil cooler should be greater than 20% of the heat generation.

Therefore, the oil cooler OLP-70 with a cooling capacity of 7 kW can be used.