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selection scheme of refrigerant R134a magnetic metering pump
Email: sales01@cxflowmeter.com
WhatsApp: +86 180 4984 1995
Analysis and recommendation of the selection scheme of refrigerant R134a magnetic metering pump
1. Analysis of customer core needs
Medium characteristics
Refrigerant R134a:
Environmentally friendly HFC refrigerant, non-toxic and non-flammable, but leakage must be avoided (ozone layer destruction regulations are becoming stricter).
25℃ physical properties:
State: liquid (boiling point -26.1℃, saturation pressure is about 0.66 MPa).
Viscosity: 195 μPa·s (close to water, low viscosity is easy to leak, high sealing is required).
Density: about 1.206 kg/L (affects the calculation of NPSH and head of the pump).
Performance parameters
Flow range: 0.1-0.6 L/min (±1% accuracy must be achieved, otherwise it will affect the efficiency of the refrigeration system).
Pressure requirements:
Pump body: 3 MPa (30 bar) (safety factor ≥1.5, actual test ≥4.5 MPa required).
Outlet back pressure: 5 bar (the pump needs to operate stably under high pressure difference, without cavitation or flow attenuation).
Temperature: 25℃ (no need for insulation/cooling, but the motor temperature rise must be confirmed to be ≤80℃).
Volume: height ≤150 mm, length ≤200 mm (suitable for compact equipment or test bench).
Motor: servo motor (supports 4-20 mA/PWM speed regulation, response time ≤50 ms).
2. Recommended pump type: 0.6-57 high-pressure magnetic pump (servo motor drive)
Key parameters of the model
Parameters 0.6-57 high-pressure model technical specifications Customer requirements matching degree
Maximum flow 0.6 L/min (adjustable to 0.1 L/min) Fully meet
Pressure resistance Pump body 4.5 MPa (test value), interface 3 MPa (design value) Up to standard
Outlet back pressure Continuous operation 10 bar (peak 15 bar) Far exceeds the 5 bar requirement
Motor type Servo motor (IP65, 24/48V DC, power 60W) Efficient and accurate
Volume 120×180×90 mm (including motor) Ultra-compact design
Material Pump head: 316L stainless steel; Magnet: Samarium cobalt alloy; Seal: PTFE Corrosion resistance, anti-refrigerant penetration
Core technical advantages
Magnetic drive system:
Zero leakage: cancel mechanical shaft seal, use static seal + magnetic coupling, life ≥ 20,000 hours
Anti-cavitation: patented flow channel design (inlet diameter ≥8 mm, reducing NPSHr to 0.3 m).
Servo motor control:
Closed-loop speed regulation: through encoder feedback, real-time correction of flow deviation (±0.5% accuracy).
Energy-saving mode: support EtherCAT/CANopen communication, speed regulation on demand, energy consumption reduced by 30%.
High-pressure structure design:
Double-layer shell: inner layer pressure-bearing, outer layer protection, bursting pressure ≥6 MPa.
Pressure balance hole: prevent magnet demagnetization due to excessive pressure difference.
Comparison of competing products (diaphragm pump/gear pump)
Comparison items Magnetic pump Diaphragm pump Gear pump
Leakage risk 0 (magnetic coupling) Medium (diaphragm fatigue) High (mechanical seal)
Flow pulsation Very low (≤0.5%) High (pulsation) Medium (gear meshing)
Pressure resistance 3-10 MPa ≤1 MPa 3-5 MPa (but prone to leakage)
Volume Compact (servo integration) Large (need pneumatic/electric unit) Medium (need reducer)
Cost Medium-high (one-time investment) Low (high consumables cost) Medium (high maintenance cost)
III. Key verification items for selection
Pressure test report
Suppliers are required to provide 3 MPa water pressure test video and 24-hour pressure maintenance certificate (ASTM D1599 standard).
Refrigerant compatibility verification
Material test:
Sealing ring: PTFE permeability in R134a at 25°C ≤1×10⁻¹² cm³·cm/(cm²·s·Pa).
Bearing: Silicon carbide (SiC) wear rate in R134a ≤ 0.1 mg/1000h.
Aging test: Pump body runs at 3 MPa, 50℃ for 500 hours, weight loss ≤ 0.05%.
Flow calibration
Use Coriolis mass flowmeter (accuracy ±0.1%) to calibrate, ensuring 0.1-0.6 L/min linearity ≥ 99.5%.
IV. CIXIFM customized service support
Modular configuration
Basic model: pump + servo motor + manual speed regulator (cost optimization).
Smart model: pump + servo drive + touch screen (support flow setting, pressure monitoring, alarm output).
Integrated model: pump + flowmeter + PLC (to achieve closed-loop control of refrigeration system, such as evaporator superheat adjustment).
Fast delivery
Conventional model: 7 days delivery (including factory test report).
Customized model: 15 days delivery (need to confirm drawings and technical agreement).
After-sales guarantee
Warranty period: 3 years for pump body, 5 years for motor (non-human damage).
Emergency service: Spare parts are provided within 48 hours (in China), and global response is 72 hours.
V. Typical application cases
New energy vehicle air conditioning test bench
Requirement: 0.2-0.5 L/min R134a metering, pressure fluctuation ≤0.1 bar.
Solution: 0.6-57 magnetic pump + servo drive, integrated pressure sensor, control accuracy ±0.3%.
Results: Test efficiency increased by 40%, and leakage rate reduced to 0.01 g/year.
Laboratory ultra-low temperature refrigeration system
Requirement: 0.1-0.3 L/min R134a, adapted to -40℃ environment.
Solution: Customized low-temperature magnetic pump (resistant to -50℃), using silicone oil circulation heating motor.
Results: System startup time is shortened to 5 minutes, and temperature fluctuation is ≤±0.5℃.
VI. Customer Action Guide
Confirm the details of the requirements
Do you need explosion-proof certification (such as ATEX Zone 2)?
Do you need data logging function (such as USB export of historical flow curve)?
Checklist before placing an order
Nameplate information: pressure resistance, flow range, motor power, explosion-proof level (if any).
List of accessories: seal spare parts kit (2 sets each of PTFE/FKM), operation manual (Chinese and English), test certificate.
Installation and commissioning suggestions
Inlet filtration: add 50 μm stainless steel filter (to prevent particles from scratching the magnet).
Outlet buffer: install pulsation damper (to reduce the impact of flow fluctuations on the system).
Grounding protection: the grounding resistance of the magnetic pump housing is ≤4 Ω (to prevent static electricity accumulation).
Contact CIXIFM Winny now to get a dedicated solution!
Email: sales01@cxflowmeter.com
WhatsApp: +86 180 4984 1995
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