Vacuum-pumping Equipment For Various Types of Air Conditioners, Refrigerators, Water Dispensers,Chillers, Heat Pumps

Purpose:

Vacuuming is an essential and important process before refrigerant charging in refrigeration equipment manufacturing or maintenance. That is , the vacuum pump is connected with the refrigeration system pipeline (generally the high and low pressure side is connected at the same time) to remove the non-condensable gas and water in the system pipeline.

1. Removing Non-Condensable Gases (NCGs):

   • What they are: Air (mostly Nitrogen and Oxygen) or other gases that enter the system during assembly, repair, or through leaks.

   • Why they are bad:

• Increased Head Pressure: NCGs occupy space in the condenser, reducing its effective surface area for condensing refrigerant. This raises the compressor discharge pressure.
• Reduced Efficiency: Higher head pressure forces the compressor to work harder, consuming more energy.
• Higher Operating Temperatures: Increased compression ratio leads to higher compressor temperatures, reducing oil life and increasing wear.
• Erratic System Performance: Can cause fluctuating pressures and temperatures.
• Water Vapor Carrier: Air contains moisture.

1. Removing Moisture (Water Vapor):

   • How it gets in: Humidity in the air trapped during assembly/repair, or ingress through leaks.

   • Why it's devastating (the biggest concern):

     • Acid Formation: Water reacts with refrigerant oil (especially mineral oil) and refrigerants (especially HFCs like R-134a, R-410a, R-404a) to form hydrochloric acid (HCl) and hydrofluoric acid (HF). This is highly corrosive.

     • Corrosion: Acids attack copper, brass, bearings, windings, and other metal components, leading to premature failure.

     • "Copper Plating": Acidic conditions can cause dissolved copper to plate out onto steel surfaces (like compressor bearings and valves), causing scoring and seizure.

     • Sludge and Wax Formation: Water reacts with oil to form sludge and deposits that clog capillary tubes, TXV screens, oil passages, and reduce heat transfer.

     • Frozen Expansion Devices: Free moisture can freeze inside TXVs or capillary tubes, causing a blockage and system failure.

     • Degraded Oil: Water reduces the lubricity and dielectric strength of the oil.

2. The Vacuuming Process:

   • Connection: As you stated, the vacuum pump is connected to both the high and low-pressure sides simultaneously (via service valves or access ports) using a manifold gauge set. This allows evacuation of the entire system.

   • Deep Vacuum: The pump pulls the system pressure down to a very deep vacuum, typically below 500 microns (µm) for most systems, often targeting 250-300 microns or lower for critical applications. This is well below the vapor pressure of water at ambient temperature.

   • Boiling Off Moisture: At this deep vacuum, any liquid water present boils at room temperature and is removed as vapor by the pump.

   • Removing Air: The vacuum pump removes the bulk of the air/NCGs quickly, but getting the last traces (and moisture) requires pulling a deep vacuum and holding it.

Why it's Essential Before Charging:

• System Integrity: Ensures the refrigerant charge is pure refrigerant, not diluted or contaminated.

• Performance: Guarantees the system operates at its designed efficiency and capacity.

• Reliability & Longevity: Prevents acid formation, corrosion, sludge, and lubrication failures, drastically extending the system's lifespan.

• Warranty: Skipping proper evacuation is a primary reason for compressor failures and often voids warranties.

• Leak Check (Indirect): A system that holds a deep vacuum demonstrates it is leak-tight. A rising vacuum level indicates a leak that must be fixed before charging.

Key Considerations for Effective Vacuuming:

• Pump Capacity: Use a pump large enough for the system volume.

• Hose Size: Use large diameter, short hoses (1/2" or 3/8" minimum) to minimize restrictions. Avoid using manifold hoses for the final evacuation if possible; connect the pump directly or use a dedicated vacuum hose/tee.

• Micron Gauge: Essential. Connect directly to the system (not the pump side) to measure the true system vacuum level. Gauges on a manifold set are not accurate enough.

• Vacuum Level: Pull down to the required micron level (e.g., <500 µm, often lower).

• Hold Test: Isolate the pump and monitor the micron gauge. A significant rise (e.g., > 500-1000 µm over 5-15 minutes) indicates moisture is still boiling off or a leak exists.

• Triple Evacuation (for moisture): In stubborn cases, break the vacuum with dry nitrogen, let it sit to absorb moisture, then evacuate again. Repeat as needed.

In summary: Vacuuming is not just a step; it's a fundamental requirement for ensuring the purity, efficiency, reliability, and longevity of any refrigeration or air conditioning system.

Application:

Various types of air conditioners, refrigerators, water dispensers, chillers, heat pumps, etc.

① HMI movable vacuum system

② Digital display movable vacuum system

③ Working station vacuum system

HMI Movable Vacuum System

Digital Display Movable Vacuum System

Digital Display Movable Vacuum System

1. Pre-sale: free of charge according to customer requirements to develop a reasonable design plan until the realization of customer production expectations;

2. Assign professional and technical personnel to provide customers with free equipment basic knowledge, practical operation, maintenance, troubleshooting training, and customers can also assign technical personnel or operators to our company for free training;

3. On-site equipment installation and commissioning for customers, regular on- site or telephone visits, answer questions and guidance for customers;

4.The machine shall be guaranteed for one year under the premise of reasonable use by the customer. The maintenance work is carried out at the door, and the maintenance response time is not more than 24 hours.

1.Manufacturing:Dongliu production base covers an area of ​​12,000 square meters and has 150 employees. After the production line equipment is assembled, it will be sent to the customer for on-site installation to ensure quality and accuracy.

2.Research and Development:52 R&D personnel, accounting for 40%.Successfully developed a series of world-leading refrigeration performance testing products.

3.Dual-channel strategy: combined systems and independent products
Continuously optimize the value supplier network layout and pre-sales service

4.System Integration:Global solution center for the entire process of refrigeration equipment production.Pioneer and promoter of many applications in automation and intelligence.

5.Services:24-hour*7-day non-stop service; providing a complete service portfolio from spare parts, emergency services, on-site services to system services.

Q1:What is the material of the conveyor line?