Product Description
Compressor Evaluation Test Machine (CETM), this machine can test all auto air condition compressor in the market.
100% Made In USA.
One compressor 1 minute test.
20 days production time.
Shipped directly from Dexas, USA.
ZheJiang CHINAMFG is the Exclusively Authorized Dealer for this TDS CETM.
If you’re interested in it, please contact me . I will send you more detail information.
Installation of auto compressor and contral volve to the machine:
Backside of the machine:
1. Flow Control Adjustment
– 12 / 24 VDC
– Nitrogen / Air Supply In
– Dump
2. Computer Interface
Automatic Ttight the Pulley Belt by Click One Button:
Reading and record the pressures change inside of compressor:
Introduction
The A/C Compressor Evaluation Test Machine (CETM) is designed to evaluate compressors without the operator needing to be familiar with the design and functionality of compressors. 2017 updated CETM machine has been manufactured for compressor manufacturers and remanufacturers with more automation and capability. The test imitates the loads that would be put on a compressor in an actual vehicle air conditioning system.
The CETM requires a computer loaded with the TDS Compressor Evaluation Software (TCES).
A list of compressor models is included in the software for convenience, but it is possible to test any compressor with a given pulley diameter and displacement per revolution. It is not necessary to know if the compressor is a fixed or variable model…the machine can determine the difference and run the correct test for either type.
Quick Start
The CETM is easy to use. Mount the compressor on the universal bracket. Align the bracket with the pulley and ensure the belt is straight. The compressor should be oiled and any excess oil drained from the compressor. Ensure that the hoses are properly connected. It is not required to have a measurement of the crank case pressure but it is beneficial for diagnostics.
Start the program and ensure the machine is communicating with the computer. This is confirmed by the status color on the DL405 PLC Communications panel changing from red to green.
The software consists of 3 (3) screens:
Variable Animation Screen -This screen gives a look into the interior of a generic variable displacement compressor. When the compressor animation ontheleft is active it signifies the compressor is running at minimum displacement. The compressor animation on the right is active when the compressor is running at full displacement. The input values at the bottom of the screen show the pressure inputs in real time.
Setup Screen The calibration of the inputs is shown on this screen. These are factory set for each machine and should not be changed. The test time is also set at the factory. The drive motor on the CETM can run CHINAMFG or backward. Most compressors will run forward.
The easiest way to run a test is to use the drop down list of compressor types listed in the “Select Compressor Type” field to select a compressor model that best represents the compressor being tested. Select the model type from the list and click on the “OK” button.
It is possible to create your own list that will automatically populate the report page or printout. Use the text file supplied by TDS and modify it to create your own text file. This file is named TheList.txt and is located in the C:/TDS/ directory.
Open this list in a text editor such as Notepad and you will be able add or remove compressor models. Make sure to keep the same format and the last line of the file MUST be “None,0,0,0,0”.
Below is a sample of the required format:
10PA20,2000,MyPartNumber,10PA20HX234,Denso
First,150,Part1,Model1,Mfg1
Two,160,Part2,Model2,Mfg2
Three,1700,Part3,Model3,Mfg3
None,0,0,0,0
As an example the first line could be a 10PA20 compressor. The line would read:
10PA20,2000,MyPartNumber,10PA20HX234,Denso
Note: The displacement per revolution is multipliedby10 if it is a fixed displacement compressor !
When the Custom List is loaded the list supplied with the machine will be temporarily unavailable until the program is stopped and restarted. The Custom List is added by clicking on the command button located next to the drop down list.
Performance Report Screen -After selecting the compressor type you must go to the Performance Report screen to enter the compressor clutch diameter. This measurement is in millimeters.
Once this is done you need to ensure the compressor is properly aligned. This is accomplished by moving the universal test bracket.
Press the start button.
Once the test is complete press the print button on the Setup screen. This will print the test report and save the data to disk.
Theory of Operation
A car air conditioning compressor is essentially a pump designed to move a gas through a closed system. There are many types of compressors and they come in many sizes. For the CETM to test many types of compressors the system has to be programmable so that the test dynamics for all models produce similar results within a specified range. This is accomplished by entering the displacement per revolution and the pulley diameter in the fields at the bottom of the Performance Report screen. Using the data from these fields a calculation is performed and the drive motor speed is changed to compensate for the size of the compressor.
As noted earlier, the test imitates the loads that would be put on a compressor in an actual vehicle air conditioning system. When the test is started current is sent to an air pressure transducer that adjusts the suction pressure to approximately 3 bar. This is well above the pressure which would result in a freezing evaporator and is also high enough to simulate a medium to high heat load on an evaporator. If the compressor is a variable displacement compressor the internal mechanical control valve should have been set at the factory to result in a crankcase pressure equal to the suction pressure.
The suction pressure is then adjusted down to a pressure that represents a low heat load or a freezing evaporator temperature. If the compressor is a variable compressor the discharge pressure should drop all the way down to unload the compressor. The suction pressure is then increased back to the high load condition. The discharge pressure should go up again. If it is a fixed displacement compressor the discharge pressure will drop proportionally to the suction pressure.
The discharge pressure is increased by putting a restriction in the discharge line. For this test the restriction is an adjustable orifice inside a metering valve. The pressure drop across an orifice is directly proportional to the mass flow rate. Therefore, when the compressor drops to minimum displacement the mass flow rate drops. When the machine is shipped the metering valve is set to fix the orifice size. This is done to set the maximum discharge pressure desired. All compressors should reach approximately the same maximum pressure at their maximum output. This maximum pressure can be adjusted with the metering valve. It is recommended that no changes be made to this valve.
Note: If you adjust this valve it may be necessary to adjust the “Peak” setting located at the bottom right corner of the Performance Report screen.
The “Peak” setting is the maximum pressure differential a good base line compressor will achieve. If this is set too low poorly performing compressor will pass, and if it is set too high good compressors will fail. This setting is extremely important and great care should be taken before it is adjusted.
The CETM has a frequency inverter to adjust the speed of the drive motor. This inverter also sends information to the computer on the amount of power being used during the test. Excessive power can result in poor durability of the drive motor.
Data
The CETM has 2 methods for reviewing the results of the test.
1. The first method is the review of the indicators for “Flow Result” and “Control Valve” located on the “Performance Report screen. These give an estimate for the operator who is not familiar with how a compressor should perform.
The “Flow Result” shows an evaluation of the flow performance of the compressor. This is determined by pressure thresholds. As mentioned previously the mass flow rate is proportional to the pressure drop across an orifice. If the higher discharge pressures are not obtained the flow will not be optimized. The settings showing a drop in compressor performance are representative of 10% drops in the pressure generated by the compressor. “Good” will be 10% lower than “Excellent”, “Acceptable” will be 20% lower than “Excellent”, and so on. It does not necessarily translate to the temperature of the air entering the passenger compartment of the vehicle. It is instead representative of the compressors performance. A pressure drop of 10% may only reflect a small amount of temperature change of the air that the passengers may not notice.
The “Control Valve” evaluation isa little more complex and is broken down as follows:
Full Function – This is when the compressor drops to a relatively low suction pressure as the compressor drops to minimum displacement.
Part Function – The evaluation will give this reading when the discharge pressure falls lower but not to minimum. It means the compressor will lower the displacement amount but not completely. This can result in the load on the engine not reducing when the maximum discharge pressure of the compressor is not needed. Although the drivability of the car may not be affected this does violate the design intent of the variable compressor.
Poor Function – This can only happen if the crankcase pressure detects that the internal mechanical control valve is working but could not detect an acceptable drop in the compressor performance. It means that there may not be enough flow through the control valve or the compressor is bypassing gas faster than the flow through the valve.
None Detected This occurs when no crankcase pressure is detected or the crankcase never rises above the suction pressure. This may happen if the internal control valve is not functioning at all or the compressor is a fixed displacement model.
Does Not Have This is the reading when a fixed displacement compressor model is selected.
The internal mechanical control valve check is skipped.
2. The second method is for operators that are more experienced with compressors or who are looking to get more information than the indicators provide. Using the graphical fields located lower on the “Performance Report” screen, the pressure curves and power draw of the compressor can be evaluated. The data is also saved to the computer hard disk, and can be imported into a spreadsheet such as Excell.
Test Machine Specifications
Machine Type…………………..Automatic PLC controlled variable and fixed displacement compressor evaluation test machine and computer loaded with TDS Compressor Evaluation Software (TCES) (monitor and printer not provided)
Compressor Drive……………….Clutch belt drive to accommodate multi-groove and V-belt pulleys
Motor……………………………………….Five horsepower premium efficiency inverter rated
Speed………………………………………Variable speed motor controller – 0 to 1750 rmp
Voltage……………………………………Dependent on available 3 phase electrical power available at the installation ocation
Low Side Monitor………………..2.5 inch 0 to 160 CHINAMFG liquid filled gauge & 0 to 100 CHINAMFG pressure transducer
High Side Monitor………………2.5 inch 0 to 300 CHINAMFG liquid filled gauge & 0 to 500 CHINAMFG pressure transducer
Sump Monitor……………………..2.5 inch 0 to 160 CHINAMFG liquid filled gauge & 0 to 100 CHINAMFG pressure
transducer
Compressor Mounting……..Universal bracket
Belts Provided………………………One multi-groove serpentine belt and 1 V-belt
Drive Belt Tentioning………..Air cylinder tensioned idler pulley
Test Capabilities…………………..Fixed displacement and variable displacement with printed test report
Dimensions…………………………..24 inches wide x 32 inches high x 30 inches deep
Weight……………………………………Approximately 250 lbs
Paint………………………………………..Polane T Plus Polyurethane Enamel
Machine Color……………………..Nitro Blue
Made in USA
Safety Features
Safety Guard with Interlock…………..Motor cannot operate without safety guard closed and will stop if the guard is opened
Emergency Stop Button…………………….Immediately shuts down all operations when pushed
ZheJiang CHINAMFG Mechanical Parts Co.,Ltd , the Exclusively Authorized Dealer for TDS CETM (A/C Compressor Evaluation Test Machine )
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| Classification: | for All Capacities |
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| Job Classification: | for Reciprocating & Rotary Type |
| Transmission Power: | Turbine,Internal-Combustion Engine, Pneumatic, Dyn |
| Cooling Method: | for Both Air-Cooled and Water-Cooled |
| Cylinder Arrangement Mode: | Symmetrical Balance |
| Cylinder Stage: | Suitable for All Stages |
| Samples: |
US$ 1/Piece
1 Piece(Min.Order) | |
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| Customization: |
Available
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Can air compressors be used for shipbuilding and maritime applications?
Air compressors are widely used in shipbuilding and maritime applications for a variety of tasks and operations. The maritime industry relies on compressed air for numerous essential functions. Here’s an overview of how air compressors are employed in shipbuilding and maritime applications:
1. Pneumatic Tools and Equipment:
Air compressors are extensively used to power pneumatic tools and equipment in shipbuilding and maritime operations. Pneumatic tools such as impact wrenches, drills, grinders, sanders, and chipping hammers require compressed air to function. The versatility and power provided by compressed air make it an ideal energy source for heavy-duty tasks, maintenance, and construction activities in shipyards and onboard vessels.
2. Painting and Surface Preparation:
Air compressors play a crucial role in painting and surface preparation during shipbuilding and maintenance. Compressed air is used to power air spray guns, sandblasting equipment, and other surface preparation tools. Compressed air provides the force necessary for efficient and uniform application of paints, coatings, and protective finishes, ensuring the durability and aesthetics of ship surfaces.
3. Pneumatic Actuation and Controls:
Air compressors are employed in pneumatic actuation and control systems onboard ships. Compressed air is used to operate pneumatic valves, actuators, and control devices that regulate the flow of fluids, control propulsion systems, and manage various shipboard processes. Pneumatic control systems offer reliability and safety advantages in maritime applications.
4. Air Start Systems:
In large marine engines, air compressors are used in air start systems. Compressed air is utilized to initiate the combustion process in the engine cylinders. The compressed air is injected into the cylinders to turn the engine’s crankshaft, enabling the ignition of fuel and starting the engine. Air start systems are commonly found in ship propulsion systems and power generation plants onboard vessels.
5. Pneumatic Conveying and Material Handling:
In shipbuilding and maritime operations, compressed air is used for pneumatic conveying and material handling. Compressed air is utilized to transport bulk materials, such as cement, sand, and grain, through pipelines or hoses. Pneumatic conveying systems enable efficient and controlled transfer of materials, facilitating construction, cargo loading, and unloading processes.
6. Air Conditioning and Ventilation:
Air compressors are involved in air conditioning and ventilation systems onboard ships. Compressed air powers air conditioning units, ventilation fans, and blowers, ensuring proper air circulation, cooling, and temperature control in various ship compartments, cabins, and machinery spaces. Compressed air-driven systems contribute to the comfort, safety, and operational efficiency of maritime environments.
These are just a few examples of how air compressors are utilized in shipbuilding and maritime applications. Compressed air’s versatility, reliability, and convenience make it an indispensable energy source for various tasks and systems in the maritime industry.
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What is the energy efficiency of modern air compressors?
The energy efficiency of modern air compressors has significantly improved due to advancements in technology and design. Here’s an in-depth look at the energy efficiency features and factors that contribute to the efficiency of modern air compressors:
Variable Speed Drive (VSD) Technology:
Many modern air compressors utilize Variable Speed Drive (VSD) technology, also known as Variable Frequency Drive (VFD). This technology allows the compressor motor to adjust its speed according to the compressed air demand. By matching the motor speed to the required airflow, VSD compressors can avoid excessive energy consumption during periods of low demand, resulting in significant energy savings compared to fixed-speed compressors.
Air Leakage Reduction:
Air leakage is a common issue in compressed air systems and can lead to substantial energy waste. Modern air compressors often feature improved sealing and advanced control systems to minimize air leaks. By reducing air leakage, the compressor can maintain optimal pressure levels more efficiently, resulting in energy savings.
Efficient Motor Design:
The motor of an air compressor plays a crucial role in its energy efficiency. Modern compressors incorporate high-efficiency electric motors that meet or exceed established energy efficiency standards. These motors are designed to minimize energy losses and operate more efficiently, reducing overall power consumption.
Optimized Control Systems:
Advanced control systems are integrated into modern air compressors to optimize their performance and energy consumption. These control systems monitor various parameters, such as air pressure, temperature, and airflow, and adjust compressor operation accordingly. By precisely controlling the compressor’s output to match the demand, these systems ensure efficient and energy-saving operation.
Air Storage and Distribution:
Efficient air storage and distribution systems are essential for minimizing energy losses in compressed air systems. Modern air compressors often include properly sized and insulated air storage tanks and well-designed piping systems that reduce pressure drops and minimize heat transfer. These measures help to maintain a consistent and efficient supply of compressed air throughout the system, reducing energy waste.
Energy Management and Monitoring:
Some modern air compressors feature energy management and monitoring systems that provide real-time data on energy consumption and performance. These systems allow operators to identify energy inefficiencies, optimize compressor settings, and implement energy-saving practices.
It’s important to note that the energy efficiency of an air compressor also depends on factors such as the specific model, size, and application. Manufacturers often provide energy efficiency ratings or specifications for their compressors, which can help in comparing different models and selecting the most efficient option for a particular application.
Overall, modern air compressors incorporate various energy-saving technologies and design elements to enhance their efficiency. Investing in an energy-efficient air compressor not only reduces operational costs but also contributes to sustainability efforts by minimizing energy consumption and reducing carbon emissions.
What are the key components of an air compressor system?
An air compressor system consists of several key components that work together to generate and deliver compressed air. Here are the essential components:
1. Compressor Pump: The compressor pump is the heart of the air compressor system. It draws in ambient air and compresses it to a higher pressure. The pump can be reciprocating (piston-driven) or rotary (screw, vane, or scroll-driven) based on the compressor type.
2. Electric Motor or Engine: The electric motor or engine is responsible for driving the compressor pump. It provides the power necessary to operate the pump and compress the air. The motor or engine’s size and power rating depend on the compressor’s capacity and intended application.
3. Air Intake: The air intake is the opening or inlet through which ambient air enters the compressor system. It is equipped with filters to remove dust, debris, and contaminants from the incoming air, ensuring clean air supply and protecting the compressor components.
4. Compression Chamber: The compression chamber is where the actual compression of air takes place. In reciprocating compressors, it consists of cylinders, pistons, valves, and connecting rods. In rotary compressors, it comprises intermeshing screws, vanes, or scrolls that compress the air as they rotate.
5. Receiver Tank: The receiver tank, also known as an air tank, is a storage vessel that holds the compressed air. It acts as a buffer, allowing for a steady supply of compressed air during peak demand periods and reducing pressure fluctuations. The tank also helps separate moisture from the compressed air, allowing it to condense and be drained out.
6. Pressure Relief Valve: The pressure relief valve is a safety device that protects the compressor system from over-pressurization. It automatically releases excess pressure if it exceeds a predetermined limit, preventing damage to the system and ensuring safe operation.
7. Pressure Switch: The pressure switch is an electrical component that controls the operation of the compressor motor. It monitors the pressure in the system and automatically starts or stops the motor based on pre-set pressure levels. This helps maintain the desired pressure range in the receiver tank.
8. Regulator: The regulator is a device used to control and adjust the output pressure of the compressed air. It allows users to set the desired pressure level for specific applications, ensuring a consistent and safe supply of compressed air.
9. Air Outlet and Distribution System: The air outlet is the point where the compressed air is delivered from the compressor system. It is connected to a distribution system comprising pipes, hoses, fittings, and valves that carry the compressed air to the desired application points or tools.
10. Filters, Dryers, and Lubricators: Depending on the application and air quality requirements, additional components such as filters, dryers, and lubricators may be included in the system. Filters remove contaminants, dryers remove moisture from the compressed air, and lubricators provide lubrication to pneumatic tools and equipment.
These are the key components of an air compressor system. Each component plays a crucial role in the generation, storage, and delivery of compressed air for various industrial, commercial, and personal applications.
editor by CX 2024-04-12