Danfoss FRR/FRL Series Hydraulic Pump
3 month ago
Product details
Danfoss FRR/FRL Series Hydraulic Pumpsare high-pressure axial piston pumps specifically designed by Danfoss for industrial hydraulic systems, widely used in metallurgy, construction machinery, marine applications, and other scenarios requiring high pressure and high power density. Below is a detailed introduction covering structural design, performance parameters, application scenarios, technical advantages, and maintenance considerations:
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I. Structural Design
• FRR Series: Features a swashplate-type axial piston pump design, offering a compact and lightweight structure suitable for space-sensitive applications (e.g., injection molding machines, hydraulic presses requiring long-term high-pressure operation).
• FRL Series: Utilizes a bent-axis axial piston pump design, slightly larger in size but with superior heat dissipation and impact resistance. It is easy to maintain and ideal for marine steering systems, mobile construction machinery, and other applications demanding rapid response.
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II. Performance Parameters
【表格】
Parameter FRR Series FRL Series
Pressure Range Up to 400–450 bar Up to 350–400 bar
Speed Range High speed (2000–3000 rpm) Medium-high speed (1500–2500 rpm)
Typical Applications Heavy-duty, continuous high-pressure operations Medium-high pressure, dynamic response-critical scenarios
Displacement Options Selectable based on system flow requirements (e.g., 30/50/90 cm³/rev) Same as above
Control Modes Constant pressure (HD), electro-hydraulic proportional (EM) Same as above
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III. Application Scenarios
1. Metallurgical Industry: Provides stable high-pressure hydraulic support for blast furnaces, rolling mills, and other equipment.
2. Construction Machinery: Serves as the power source for excavators, loaders, and other equipment, ensuring efficient operation.
3. Marine Sector: Critical hydraulic components for ship steering systems and propulsion systems, ensuring safe navigation.
4. Injection Molding & Hydraulic Presses: Delivers long-term stable high-pressure oil supply for reliable equipment performance.
5. Mining Machinery: Heavy-duty stamping equipment and mining vehicles requiring high pressure and reliability.
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IV. Technical Advantages
1. High Efficiency & Low Noise:
• Optimized fluid dynamics design minimizes energy loss, improving volumetric and mechanical efficiency.
• Advanced noise control technology ensures low operating noise, suitable for noise-sensitive environments.
2. Flexible Flow Adjustment:
• Supports multiple control modes, including pressure compensation (PC), load sensing (LS), and electro-hydraulic proportional (EM), enabling flexible flow adjustment based on actual conditions.
3. Corrosion Resistance & High Strength:
• The pump body is made of high-strength cast iron or corrosion-resistant materials, while key components (e.g., pistons) undergo special treatment to withstand extreme pressure and harsh environments.
4. Long Service Life & Low Maintenance:
• Long replacement intervals for seals (e.g., axial seals and O-rings recommended for inspection every 5000 hours) reduce maintenance costs.
• Requires hydraulic oil with a cleanliness level of NAS 8 or higher to minimize port plate wear and extend service life.
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V. Maintenance Considerations
1. Hydraulic Oil Management:
• Use hydraulic oil with a cleanliness level of NAS 8 or higher to prevent particle-induced port plate wear.
• Maintain oil temperature between 30–60°C; prioritize heat dissipation for the FRL series.
2. Seal Inspection:
• Inspect axial seals and O-rings every 5000 hours, replacing worn components promptly.
3. Troubleshooting:
• Excessive Pressure Fluctuations: Check for air ingress or blockages in the suction line; verify filter and seal integrity.
• Abnormal Noise: Investigate piston/slipper wear or oil foaming; replace worn parts and perform oil replacement/air bleeding.
• Insufficient Flow: Clean the variable mechanism and check for shell seal leakage.
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VI. Model Selection Recommendations
• High-Pressure Scenarios: Prioritize the FRR series (supports 400+ bar pressure) for applications like mining machinery and heavy-duty stamping equipment.
• Dynamic Response Scenarios: Choose the FRL series (superior impact resistance) for marine steering systems and mobile construction machinery.
• Control Requirements:
• Stable Pressure Systems(e.g., hydraulic power units): Select constant pressure (HD) models.
• Remote Pressure Adjustment or Precise Flow Control: Opt for electro-hydraulic proportional (EM) models.
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