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Semi-hermetic Compressor

Shenzhen Ruifujie Technology Co.,Ltd: Your Professional Semi-Hermetic Compressor Manufacturer!

 

Shenzhen Ruifujie Technology Co., Ltd. is a large-scale modern enterprise specializing in R&D, production, and sales of refrigeration products. The company has great advantages in the trading of compressors and refrigeration accessories and has close cooperation with major compressor manufacturers around the world. The company develops and produces scroll, piston, and screw compressors that are exported to all over the world. We have strong technical strength and experience in cold storage, freezing, quick freezing, and flake ice machines, block ice machine production, and sales.


Rich Product Variety
Our company can produce hermetic scroll compressor, hermetic piston compressor, semi-hermetic piston compressor, screw compressor, hermetic air-cooled condensing unit, semi-hermetic air-cooled condensing unit, semi-hermetic water-cooled condensing unit, piston parallel condensing unit, screw condensing unit, air cooled condenser, air cooler, flake ice machine, block ice machine, fresh storage, freezing room, quickly freezer room, large freezer room, and so on.

 

Quality Guaranteed
We have more than 20 years of experience in the development of compressors and refrigeration accessories. We strictly control product quality and insist on making high-quality products.

 

Wide Range of Product Uses
Our products are widely used in cold storage, frozen food processing and storage，low-temperature shelf, ice cream machine, showcase, chiller, large integrated air conditioning, laboratory and medical equipment, cold dryer，etc.

 

Leading Service
We have many years of industry experience and a complete production management, quality supervision, sales service operation system. Whether you want to buy a semi-hermetic compressor or a hermetic piston compressor, just send your requirements by email and we can customize the product for you.

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What is Semi-Hermetic Compressor

 

A semi-hermetic compressor is a sealed unit. But unlike hermetic compressors, semi-hermetic compressors have housings that can be opened for easy service and maintenance. The motor and compressor are enclosed together, but it is possible to access the internal components if needed.

 

What are Advantages of Semi-Hermetic Compressor
 

 

Low Energy Consumption
Semi-hermetic compressors are directly driven by motors and do not require a transmission mechanism, so they have high energy transmission efficiency and can effectively reduce energy consumption. In addition, semi-hermetic compressors are usually equipped with efficient cooling systems that can quickly reduce gas temperature and further improve the efficiency of the compressor.

 

Reduce Noise
The operating noise of semi-hermetic compressors is low, mainly due to their special shell structure. This structure can effectively absorb and isolate noise and reduce the noise pollution of the compressor. Especially in environments where large compressors are required, semi-hermetic compressors can better reflect their superior noise control effect.

 

Low Maintenance Cost
Since semi-hermetic compressors occupy less space when in use, their maintenance cost is much lower than other types of compressors. In addition, the structure of semi-hermetic compressors is simple, easy to maintain and repair, and can ensure the long-term stable operation of the compressor.

 

High Efficiency
Semi-hermetic compressors use advanced design and manufacturing technologies, which can operate stably under various working conditions, improve efficiency and reliability. At the same time, the components of semi-hermetic compressors are made of high-quality materials to ensure their long service life.

 

Good Stability
The structure of semi-hermetic compressors is relatively stable, and no large dynamic load will occur during operation. At the same time, the internal gas circulation system of the semi-hermetic compressor is enclosed inside the casing, which can ensure that it can work efficiently and stably in harsh environments.

 

What are the Applications of Semi-Hermetic Compressor

Refrigeration and Air Conditioning Field

Semi-hermetic compressors are widely used in refrigeration equipment such as household refrigerators, commercial freezers, and air conditioners. It operates stably, consumes low energy, and can meet different refrigeration load requirements. Therefore, it has been widely used in the field of refrigeration and air conditioning.

Industrial Gas Field

Semi-hermetic compressors are also widely used in industrial gases, such as ammonia, hydrogen, oxygen, nitrogen, etc. Due to its stable operation, low noise, and good reliability, semi-hermetic compressors have high application value in the field of industrial gases.

Chemical Field

In the chemical field, semi-hermetic compressors are widely used in ammonia synthesis, methanol synthesis, coal-to-natural gas and other production processes. Due to its stability and good sealing, semi-hermetic compressors have an irreplaceable position in the chemical field.

 

Components of Semi-Hermetic Compressor
Bitzer Semi Hermetic Compressor High Quality R134
Bitzer Semi Hermetic Reciprocating Industrial Screw Compressor
Bitzer Semi-Hermetic Compressor 4DES-5Y-40S
Bitzer industrial screw Semi Hermetic Reciprocating Compressor

Compressor Body
The compressor body is made of materials such as cast iron, copper and steel, in which the lubricant and coolant channels are internal structures, and there are heat sinks on the outer surface to effectively dissipate heat.

 

Motor
The motor is the power source of the semi-hermetic refrigeration compressor. During operation, the power is transmitted to the compressor body through a belt drive to enable it to work normally.

 

Compressor Piston
This component forms a compression process by passing the gas in the compressor body.

 

Crankshaft
The crankshaft is a component that converts piston motion into rotational motion. It is made of materials such as cast iron and steel.

 

Valve
The valve refers to several valves in the compressor body that are used to control the flow of gas. Common valves include suction valves, exhaust valves, high-pressure valves and low-pressure valves.

 

Condenser
The condenser of a semi-hermetic compressor is a component that discharges the high-temperature and high-pressure refrigerant compressed by the compressor and cools it into liquid refrigerant by dissipating heat. It usually adopts an appearance formed by the stacking of copper tubes and aluminum sheets.

 

Evaporator
The evaporator is an important component of a semi-hermetic compressor, which is used to absorb heat from the air and change the refrigerant from liquid to vapor. It usually adopts a structure similar to a radiator, through a tube composed of multiple spiral coils, and a fan is laid to accelerate natural convection to reduce the temperature of the refrigerant.

 

Compressor
The compressor is the core component of the semi-hermetic compressor, which mainly compresses the low-temperature, low-pressure refrigerant into high-temperature, high-pressure refrigerant, and then sends it to the condenser. It usually consists of a cylinder, a piston and a gas valve.

 

Throttling Device
The throttling device is a component used to adjust the pressure difference between the evaporator and the condenser of the refrigerant and control its flow rate. It usually takes the form of a conduit or a throttle valve, which can provide a proper cooling cycle to other components such as the compressor.

 

How to Choose Right Semi-Hermetic Compressor
 

Refrigeration Needs
Determine your refrigeration needs, including refrigerant type, cooling capacity, and operating temperature range. Different application scenarios may require different types of semi-hermetic compressors.

 

Compressor Type
Choose the appropriate compressor type based on the specific requirements of the application. Common semi-hermetic compressors are screw and centrifugal. Each type has its advantages and scope of application.

 

Energy Efficiency and Performance
Consider the energy efficiency and performance indicators of the compressor, such as energy efficiency ratio, refrigeration efficiency, noise level, etc. Finding a compressor with high energy efficiency and good performance can reduce operating costs and improve system effects.

 

Maintenance and Care
Understand the maintenance requirements and maintenance cycles of the compressor. Choose a model that is easy to maintain and maintain to ensure long-term stable operation and reduce maintenance costs.

 

Cost Considerations
Choose a suitable semi-hermetic compressor based on factors such as budget, performance requirements, and long-term return on investment. Be careful not to only focus on the purchase cost, but also consider its overall benefits.

 

 
Maintenance Tips for Semi-Hermetic Compressor
 
01/

Regular Cleaning
Regularly clean the semi-hermetic compressor and its surrounding parts, including the condenser, evaporator, etc. Removing dust, dirt and other impurities can help maintain good heat exchange efficiency.

02/

Lubricant Inspection and Replacement
Regularly check the quality and level of the lubricant. Make sure that the lubricant meets the specified requirements and replace it according to the maintenance manual or the manufacturer's recommended schedule.

03/

Pipeline Inspection
Regularly check the pipes and connections of the refrigeration system to ensure that there are no leaks or damage. Repair or replace any problems found.

04/

Electrical System Inspection
Regularly check the electrical system of the compressor, including power lines, terminals and control components. Make sure that the electrical connections are safe and reliable, without looseness or damage.

05/

Prevent Vibration and Noise
Regularly check the support structure and vibration isolation device of the compressor to ensure that it is firmly installed and can effectively reduce vibration and noise.

06/

Temperature and Pressure Monitoring
Regularly monitor the temperature and pressure in the refrigeration system to detect abnormal conditions in time and take appropriate measures.

07/

Follow Operating Procedures
Follow the correct operating procedures, do not overload the compressor, and avoid abnormal conditions such as frequent start and stop or sudden power failure.

08/

Seek Professional Service
If a malfunction occurs or more complex maintenance work is required, it is best to seek the help of a professional repairman.

 

FAQ

Q: What are the common faults of semi-hermetic compressors?

A: Oil leakage resulting in too little lubrication; insufficient coolant or oil within the system; slugging of oil or coolant into the compressor; overheating of the compressor; by-products or contaminants inside the system that erode valves and seals; the thermostatic expansion valve was set incorrectly.

Q: What materials are a semi-hermetic compressor?

A: Semi-hermetic compressors are constructed using high-quality materials to ensure their durability and reliability. The compressor shell is typically made from a steel sheet, with the top cover being welded together with the bottom housing. This hermetically sealed connection effectively prevents any refrigerant from leaking outside, guaranteeing the compressor’s efficient operation.

Q: What are the structures of a semi-hermetic compressor?

A: The housing serves as the outer casing containing all internal components, typically made from durable materials like steel or aluminum. An electric motor powers the compressor pump inside, which could be located outside the sealed area for maintenance convenience. The compressor pump itself consists of a rotating assembly such as a rotor or scroll that compresses the refrigerant or gas. A shaft seal is crucial in preventing leaks where the motor shaft connects to the compressor pump. Bearings ensure smooth rotation of the assembly within the compressor. For cooling, systems like fins or fans regulate the temperature during operation. Finally, controls and sensors ensure the compressor operates reliably and efficiently by monitoring its performance.

Q: How does a semi-hermetic compressor work?

A: The operation of a semi-hermetic compressor involves compressing refrigerant or gas to a higher pressure using a sealed pump that is driven by an electric motor positioned outside the sealed area. As the motor receives electrical power, it rotates the rotating assembly within the sealed pump. This assembly made up of parts like a rotor or scroll, compresses the refrigerant or gas between its lobes or coils as it turns. The resulting high-pressure gas is then released through an outlet port for use in refrigeration or air conditioning applications. A cooling system, which may include fins or fans, helps to manage the heat produced during compression. Controls and sensors are integral in monitoring the compressor’s pressure, temperature, and overall operation, ensuring it works efficiently and reliably. A shaft seal plays a critical role in preventing refrigerant or gas from leaking at the motor shaft entry point, preserving the compressor’s sealed functionality.

Q: What can cause a semi-hermetic compressor to overheat?

A: Cooling System Failure: Malfunctions in the cooling system, such as a defective fan or other components, can result in inadequate cooling, thereby causing the compressor to overheat.
Low Refrigerant Charge: Insufficient refrigerant forces the compressor to work harder to achieve the necessary temperatures, often leading to overheating.
Obstructed Airflow Path: Clogged filters or debris accumulation can obstruct airflow, interfering with coolant circulation and potentially causing the compressor to overheat.
High Operating Load: A compressor operating under high loads, due to excessive refrigerant charge or high cooling demands, may consume more energy than designed for, leading to elevated temperatures.
Improper Compressor Sizing: Mismatches between the compressor’s capacity and the system’s cooling requirements can lead to inefficiencies that result in overheating.
Damaged Internal Parts: Wear or damage to the compressor’s internal components, such as the motor or bearings, can compromise its operation and lead to overheating.

Q: How to prevent overheating of a semi-hermetic compressor?

A: Suction Line Insulation: Insulate the suction line to prevent heat absorption that can elevate compressor temperatures due to environmental heat sources.
Proper Low-Pressure Control: Set low-pressure controls to optimize system response time and prevent operation outside the design envelope.
Condenser Maintenance and Pressure Stability: Keep the condenser clean and ensure no pressure drop occurs in the suction line to uphold optimal performance.
Refrigerant Level Management: Maintain the right refrigerant level to facilitate effective cooling of the compressor’s internal components.

Q: What is the compression process of a semi-hermetic compressor?

A: Inhalation: When the piston moves downward, the volume of the working chamber increases, and the gas enters the compression chamber through the intake valve, while the gas temperature increases.
Compression: When the piston moves upward, the volume of the working chamber decreases, the gas is compressed, and the pressure and temperature increase.
Cooling: The temperature of the compressed gas is very high and needs to be cooled by a cooling system to ensure that the subsequent compression process is not affected by excessively high temperatures.
Exhaust: After compression is completed, the gas is discharged through the exhaust valve, and the pressure and temperature in the compression chamber drop rapidly.

Q: What is the control method of semi-hermetic compressor?

A: There are two main control methods for semi-hermetic compressors: manual control and automatic control. Manual control refers to manually controlling the switch of the compressor and controlling the start and stop of the fans of the condenser and evaporator. Automatic control refers to combining the compressor, condenser, evaporator, electrical controller and other equipment into an automatic control system, and setting the corresponding automatic control program to achieve automatic operation and control. Automatic control can greatly improve operating efficiency and stability and reduce the difficulty of operation.

Q: What should I pay attention to before using a semi-hermetic compressor?

A: Before using a semi-hermetic compressor, it is necessary to install and debug it according to the installation instructions provided by the manufacturer to ensure correct use.
The working environment of the semi-hermetic compressor should be kept clean and well ventilated to avoid affecting its normal operation.
When using a semi-hermetic compressor, it should be operated strictly according to the type and charge of the refrigerant to avoid damage caused by improper charging.
After the wiring of each component is completed, each wiring port should be checked to see if it is fixed and reliable to prevent poor contact or short circuit of the wires.

Q: What should be paid attention to when installing the refrigerant inlet and outlet wiring?

A: There are two pipes for the refrigerant inlet and outlet of the semi-hermetic compressor, namely the liquid pipe and the gas pipe. The liquid pipe is the refrigerant pipe that enters the semi-hermetic compressor from the condenser, and the gas pipe allows the refrigerant to flow to the evaporator. When connecting the pipes, attention should be paid to the length of the pipes and the degree of curvature of the pipes. Pipes that are too long or too curved will reduce the refrigeration effect of the semi-hermetic compressor. When connecting the pipes, appropriate joints should be used to ensure that the connection is firm and leak-free.

Q: What is electrical control wiring?

A: Electrical control wiring is an important part of the semi-hermetic compressor wiring. The electrical control panel generally has switches, capacitors, voltmeters, pressure protection switches and other devices. When wiring, the power supply phase should be determined first to ensure that the wiring is correct. After the electrical control wiring is completed, experiments should be carried out to ensure that the electrical control system works normally, including refrigerant pressure and temperature protection.

Q: What should be paid attention to during the start-up of the semi-hermetic compressor?

A: Check the equipment: Before starting, carefully check the appearance and components of the equipment to ensure that there is no damage or abnormality.
Determine the working conditions: Understand the current working conditions, including ambient temperature, system load and refrigerant level, so as to adjust the operating parameters of the compressor.
Lubricant oil inspection: Ensure that the quality and level of the lubricant are normal, and replenish or replace as needed.
Condenser cleaning: Before starting, ensure that the inside and outside of the condenser are clean to maintain good heat dissipation performance.
Turn on the power: According to the correct operating sequence and procedures, turn on the power step by step and provide the required current and voltage.

Q: What should be paid attention to during the stop of the semi-hermetic compressor?

A: Reduce the load: Before stopping, gradually reduce the system load to reduce the workload of the semi-hermetic compressor.
Observe the operating status: Observe the operating status and parameters of the semi-hermetic compressor before stopping to ensure that no abnormalities occur.
Turn off the power: Follow the correct operating sequence and procedures to gradually turn off the power and cut off the current supply.
Condenser cleaning: After stopping, the condenser can be cleaned to remove sediment and dirt and maintain heat dissipation performance.

Q: What does the safe operating procedure of a semi-hermetic compressor include?

A: Understand the compressor system: Be familiar with the working principle, components and system layout of the semi-hermetic compressor. Understand the operating parameters, restrictions and safety measures of the compressor.
Protective measures: Make sure to wear appropriate personal protective equipment, such as goggles, gloves, earplugs, etc., before performing any operation to ensure personal safety.
Pressure release: Before maintenance or repair, the pressure in the compressor system must be completely released to avoid injury caused by pressure release when the valve or joint is accidentally opened.
Maintenance and overhaul: Only trained and authorized personnel can perform maintenance and overhaul operations on the compressor. When performing maintenance and overhaul, be sure to follow the instructions in the operating manual and ensure that the equipment is powered off and the pressure has been released to avoid accidents.
Emergency handling: Understand the emergency handling procedures in emergency situations, including fire, leakage, abnormal pressure, etc. Take safety measures according to the actual situation to ensure personnel evacuation and notify relevant departments.
Environmental protection: Ensure proper handling of refrigerant leaks and waste. Follow environmental regulations and take appropriate measures to reduce the impact on atmospheric ozone depletion and global warming.
Regular inspection and maintenance: Regularly inspect and maintain the compressor system, including cleaning, lubrication, and replacement of parts. Ensure that the equipment operates normally and reduce the occurrence of failures and accidents.
Training and awareness improvement: Organize relevant personnel to participate in safety operation training regularly, and provide necessary safety awareness education to enhance their cognition and understanding of the safe operation of semi-hermetic compressors.

Q: What is the reason for the aging of semi-hermetic compressors?

A: Mechanical wear
After a semi-hermetic compressor has been used for a long time, the mechanical parts will wear out. This is one of the main reasons for the aging of semi-hermetic compressors. Mechanical wear will cause the gap between mechanical parts to become larger, which will affect the compression efficiency and working stability of the semi-hermetic compressor.
Material aging
The pipes, seals, valves and other parts inside the semi-hermetic compressor are all made of materials. Long-term use will cause material aging, causing pipes, seals, valves and other parts to gradually become old and hard, and lose their original flexibility and elasticity. These aging parts are prone to air leakage and failure, which affects the working efficiency of the semi-hermetic compressor.
Electrical component aging
The electrical components in the semi-hermetic compressor will also gradually age over time, such as contactors, circuit breakers, fuses, capacitors, etc. The aging of electrical components will cause loose circuit connections, poor contact, unstable current and other faults, which will affect the normal operation of the semi-hermetic compressor.

Q: What are the factors that affect the service life of semi-hermetic compressors?

A: Usage conditions: The service life of semi-hermetic compressors will vary under different conditions of use. For example, when used in a high temperature and high humidity environment, the mechanical parts inside the compressor are susceptible to corrosion and wear, resulting in a shortened service life.
Load operation: Semi-hermetic compressors are prone to excessive wear of mechanical parts when the load is too high or the load fluctuates greatly, thereby shortening the service life.
Maintenance: Under normal conditions of use, regular maintenance can extend the service life of semi-hermetic compressors and reduce the incidence of failures.
The quality of the compressor itself: The manufacturing quality of the semi-hermetic compressor will also affect its service life. Good compressor materials, processing technology and production technology can extend the service life of the compressor.

Q: How to extend the service life of a semi-hermetic compressor?

A: Avoid overloading or excessive voltage fluctuations during use.
Maintain a good use environment to avoid damage to the compressor in adverse environments such as high temperature and high humidity.
Perform regular maintenance, clean the inside of the machine, replace wearing parts, and check whether all mechanical parts are working properly.
When the semi-hermetic compressor is running, it should be operated strictly in accordance with the instruction manual to avoid any misuse.

We're professional semi-hermetic compressor manufacturers and suppliers in China, specialized in providing high quality products with competitive price. We warmly welcome you to buy cheap semi-hermetic compressor in stock here from our factory.

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