The principle of operation, device and features of COPELAND refrigeration scroll compressors. Improved energy efficiency and other benefits of COPELAND scroll compressors compared to other refrigeration compressors.
Learn more about Copeland scroll compressor models
Specifications and prices for hermetic medium temperature Copeland Scroll ZR (R407C) scroll compressors
Copeland Scroll ZP Series (R410A) Hermetic Medium Temperature Scroll Compressors Specifications and Prices
Specifications and prices for hermetic scroll compressors Copeland Scroll series ZPD and ZRD
Copeland ZH Series Hermetic Scroll Compressor Specifications and Prices
Copeland ZB Series Hermetic Scroll Compressors Specifications and Prices
Copeland ZF Hermetic Scroll Compressor Specifications and Prices
Specifications and prices for digital compressors Copeland Scroll ZFD and ZBD series
About scroll compressors in general and about COPELAND scroll compressors in particular
For the first time such a simple type of compression was patented in 1905. The movable spiral, moving in concert with respect to the fixed spiral, creates between these spirals a system of crescent-shaped areas filled with gas (see Fig. 1).
During the contraction process, one helix remains stationary (fixed), while the second makes orbital (but not rotational) movements (orbital helix) around the fixed helix. As this movement develops, the areas between the two spirals are gradually pushed towards their center while shrinking in volume. When the area reaches the center of the spiral, the gas, now under high pressure, is forced out of the port located in the center. During compression, several areas are compressed at the same time, which allows the compression process to proceed smoothly.
Both the suction process (the outer part of the spirals), and the injection process ( inner part spirals) are carried out continuously.
1. The compression process is carried out by the interaction of the orbital and fixed spirals. The gas enters the outer regions formed during one of the spiral's orbital motions.
2. During the passage of gas into the cavity of the spirals, the suction areas are closed.
3. As the moving spiral continues its orbital motion, the gas is compressed into two ever-decreasing regions.
4. By the time the gas has reached the center, discharge pressure has been built up.
5. Usually, during operation, all six gas-filled areas are in various stages of compression, which allows the suction and discharge processes to be carried out continuously.
Copeland scroll compressors first appeared on the refrigeration market in Russia and CIS countries in the early 90s of the last century. Copeland scroll compressors have found application in all major air conditioning systems, including split and multi-split models, floor standing versions and in chillers, roof tops ( rooftop air conditioners) and heat pumps. A typical application is air conditioning in apartments, ships, factories and large buildings, also in automatic telephone exchanges, in refrigeration processes and in transport. Refrigeration scroll compressors are widely used in condensing units, supermarket "remote refrigeration" systems, industrial refrigeration and transport applications, including containers. The limits of cooling capacity for scroll compressors are constantly expanding and are currently approaching 200 kW when using a multi-compressor station.
This model range has both a standard set of compressor features and new additional functions. This set of features is unparalleled among other types of compressors. Copeland scroll compressors are available in the 2...15 HP power range. (according to the built-in electric / motor). The main features of these compressors include: wide operating range, efficiency comparable to semi-hermetic compressors and superiority over hermetic models in low temperature applications, smooth operation allowing constant compression and fewer moving parts, high reliability achieved with exclusive Copeland Scroll design ™. Size advantage: Copeland scroll compressors take up 1/3 of the footprint of an equivalent semi-hermetic compressor model and weigh 1/4 of its weight. Scroll compressors have fewer moving parts than reciprocating compressors. As a result, they are more reliable and can be used over a wider operating range. Optimized for low, medium and high evaporating temperatures, Copland's refrigeration scroll compressor series are increasingly replacing reciprocating compressors. Copland scroll compressors of the ZR series use 50 and 60 Hz electric motors. ZR scroll compressors are adapted for HFC and HCFC refrigerants and the complete ZR range can be supplied with either mineral or synthetic oil.
It is believed that scroll compressors are applicable only in air conditioning, and only semi-hermetic reciprocating or screw compressors are suitable for operation in the low temperature region. Yes, this statement is true for most scroll compressors in the world. But not for Copeland compressors. Many distributors of competitive products point out to everyone that the scroll compressor is designed only for high or, in extreme cases, medium temperatures. They probably mean compressors that they supply themselves, without being able to purchase equipment with more capabilities. Or, which is also likely, such statements are just a trick in the competition for the minds of those who are not yet privy to the details. internal device scroll compressors various firms and also knows nothing about their comparative advantages/disadvantages.
One of the unique features of Copeland scroll compressors is the ability to painlessly inject liquid (or vapor) refrigerant directly into the scroll cavities approximately halfway through the compression process. Most other scroll compressors do not have this possibility due to the serious design difference. Copeland, being a pioneer in the industrial development of scroll technology on a global scale (the world's first serial scroll compressors rolled off the assembly line of the new specialized Copeland plant in the USA in 1987), was the first to patent in a number of countries the most interesting technical solutions, which allow injection of liquid for intercooling in low-temperature conditions directly into the compression zone, without reducing the working life of the compressor. Due to this, the Copeland low-temperature scroll compressor is practically the only one in the world that can safely operate at evaporating temperatures of minus 35 ... minus 40 ° C (R22 or R404A) and at normal condensing temperatures of + 30 ... + 50 ° C. In this way, technological process freezing with a Copeland low temperature scroll compressor is today's reality. This technology has already been tested and successfully applied in Russia, Ukraine and other CIS countries.
Those who already have their own practical experience in operating low-temperature Copeland scroll compressors are well aware that no other compressor of any type (including reciprocating, rotary, screw and even turbo compressors) reaches a given low temperature regime as quickly as it happens with scroll compressors. Copeland compressor. So those customers who want the fastest freezing rate can thank Copeland for the low temperature scroll compressor.
The second generation of Copland's ZB and ZF vapor injected refrigeration scroll compressors are designed for medium and low temperature applications with industry-leading year-round efficiency. ZB series with drive power from 2 to 30 HP. and ZF from 4 to 15 hp designed to work with refrigerants R22, R134a, R404A and R407C. With three times fewer moving parts than traditional semi-hermetic reciprocating compressors, built-in protection and a scroll-matching mechanism, it provides significant tolerance to liquid refrigerant ingress, which makes this range of compressors as a whole very reliable.
Others important benefits scroll compressors "Copland"are work at low temperatures condensing range providing excellent annual operating efficiency, wide operating range and downsizing for better adaptability to the required application. Particularly suitable equipment for multi-evaporative refrigeration systems requiring capacity control are the scroll compressor models ZBD for medium evaporating temperatures and ZFD with vapor injection for low evaporating temperatures.
The Copland digital scroll compressor provides stepless capacity control from 10 to 100% with a simple mechanical system and guarantees precise control of evaporating pressure and temperature at any load. The Copland digital scroll compressor does not require complex electronic control and easily integrated into the refrigeration system. Compressor motor always runs at constant rated speed for high reliability and efficiency internal system lubricants.
Comparison with other types of compressors
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Low temperature spiral Copeland compressors |
Other types of compressors of any known global manufacturers |
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High feed rate and coefficient of performance in the optimum for this model range areas pressures (temperatures) of boiling in combination with normal pressures (temperatures) condensation => at the same cooling capacity consumed power below |
Most piston sealed and semi-hermetic (except for models of the Copeland series Discus), rotary, screw and centrifugal compressors have the worst performance due to one or more of the following factors: "dead" volume, valve losses, large internal heat losses, high efficiency only in relatively narrow range of compression ratios, etc. => for the same cooling capacity power consumption is higher |
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The possibility of using one model in a wide range of boiling points from minus 40oC to +7oC (for R22 or R404A) => for various applications only one type of model required (low temperature!) => optimization warehouse stock: fewer models - fewer parts |
Most other types of compressors have a clear division into low- and medium-temperature models => for different tasks required several different types models (2 or even 3 like!) => stock is too large - more parts needed |
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Relatively high drive power motor overheating is prevented mode exit. Higher reliability. No need to protect the engine low temperature compressor work at high pressures (temperatures) boiling => not required Expansion valve with MOP function => technological tasks are completed much faster due to the rapid filling of the evaporator in the period of compressor start-up and output to safe mode of operation (for example, freezing of the product will take a long time faster; the finished product will be more quality) |
Due to the relatively low drive power low temperature reciprocating compressors artificial restriction required maximum pressure (temperature) of boiling, which is usually implemented using a TRV with MOP function => an expansion valve with MOP function is required MOP => due to low refrigerant supply to evaporator until reaching the limit maximum boiling pressure (individually for each compressor) refrigeration (freezer) unit reaches the set very slow mode => loss of quality frozen products due to violation freezing speed |
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The starting current is almost the same working (the compressor starts up completely internally mechanically unloaded) => minimum => compressor contactors may have less power, and The protective circuit breaker must be (!) less powerful. Saving electricity at start-up. |
Other types of compressors have increased or very high starting current even with application of mechanical unloading devices => adverse effect on neighboring electrical consumers; more powerful needed wiring equipment Increased power consumption at start-up. |
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The Copeland scroll compressor has one of the best grades oil carryover into the system is one of the most low values => in many applications cases, the use of an oil separator and other complex system components no lubrication required |
Oil carryover in most piston compressors (except models with ventilating valve in the crankcase, for example, for Copeland - model series Discus or S-series) are higher, while screw several times higher => optional necessarily require expensive oil return system components (and sometimes cooling), plant control system becomes more complex, and its reliability decreases |
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Ability to work temporarily intermittent (lean) oil return due to teflon plain bearings => high working life even in heavy operating conditions (eg. low viscosity due to high oil temperature or large the amount of dissolved refrigerant; intermittent (portioned) return oil to the compressor) |
Almost all other compressors in the world (except model series Discus or S-series at Copeland), in which use plain bearings, have a bronze or similar finish (babbits, etc.) in friction pairs => at improper lubrication conditions increased wear of friction pairs => quick failure compressor |
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High feed rate per throughout the service life due to the free self-adjusting seal between spirals - radial alignment => constant cooling capacity |
For most types of compressors, the coefficient supply decreases as the operation progresses compressor due to wear of the mating parts in compression cavities => reduced cooling capacity at the end normative service life |
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Improved resistance to wet course "thanks to the radial harmonization |
Low resistance to "wet running" for all types of compressors (including scroll models where there is no radial matching), except screw compressors |
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High resistance to mechanical pollution due to radial harmonization |
Ingress of mechanical particles into the compression zone almost always leads to failure. all types of compressors, including scroll models without radial matching |
Comparison with other types of scroll compressors
| Copeland scroll compressors | Other scroll compressors |
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Has the most complete line scroll compressors, including low-temperature models up to minus 40 boiling point: * air conditioning (R22, R134a, R407C) ZR * air conditioning (R410A) ZP * high temperature heat pumps ZH * high and medium temperature cooling / chillers ZB * medium temperature cooling ZS * ZF low temperature cooling * ultra-low temperature (cryogenic) cooling ZC * horizontal models: ZBH - high and medium temperature cooling ZSH - medium temperature cooling ZFH - low temperature refrigeration * models with stepped and stepless performance regulation |
Most of the companies that produce spiral compressors, have in their arsenal only models for air conditioning (in the extreme case, for medium temperature cold), because low-temperature models are too complex and require a radical change in the internal designs |
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There is an internal mechanical coil overload protection: medium and temperature models ZS and ZF – when the pressure ratio is exceeded discharge/suction ratio 20:1 high and medium temperature models ZR and ZB - when the pressure ratio is exceeded discharge/suction ratio 10:1 due to axial alignment |
Most manufacturers have a mechanical protection of the spirals themselves from overloads missing (no axial alignment) => possible destruction of the spirals when overloaded |
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When starting, the spirals do not touch each other with their side surfaces (due to axial adjustment) => unloaded start => increased engine life and reduced Energy consumption |
Most scroll compressors have structure with a rigidly fixed trajectory movement of the rotating helix (no axial matching) => starting under load => increased power consumption |
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Direct contact between coils in end direction without application end gaskets => high resource and ability to work at high compression ratios |
Many manufacturers use end gaskets to ensure proper seals => reduced service life and Difficulties in dealing with large fluctuations pressure (low temperature modes) |
Copeland Digital Scroll™ compressors
Copeland's Digital Scroll™ compressors are based on unique technology approval of the Copeland Compliance™ spiral block. Performance control is achieved by spreading the spirals in the axial direction for a short period of time. It's simple and reliable mechanical way for stepless capacity control, precise temperature control and system efficiency.
The Copeland Digital Scroll™ compressor is a solution that can be integrated into existing system. This is quick and easy as no other components are required. To simplify the implementation process, Dixell and Alco have developed two controllers with Copeland to control Copeland Digital Scroll™ compressors.
The Copeland Digital Scroll™ compressor offers the widest range of capacity control in the industry and allows smooth capacity changes from 10% to 100% without changing the operating range compared to a standard Copeland Scroll™ compressor. As a result, suction pressure and temperature are maintained very accurately and compressor cycling is kept to a minimum. This guarantees optimum efficiency systems and long term equipment and component services.
The ability to use Copeland Digital Scroll™ compressors at condensing temperatures down to 10°C also guarantees the best seasonal efficiency in the compressor market. The refrigerant velocity in systems with Copeland Digital Scroll™ compressors is identical to standard compressors, even at low capacities.
The Copeland Digital Scroll™ compressor runs at full speed all the time, never reducing oil return to the compressor. The Digital Scroll™ compressor provides the same high level of reliability as systems with standard compressors. The compressor motor does not overheat and there are no resonant oscillations during operation, as is often the case in systems with an inverter.
Copeland ZF EVI High Efficiency Scroll Compressors
Copeland Scroll TM offers the most effective solution for low temperature applications in supermarkets. Three years ago, with the introduction of the ZB scroll compressors for medium evaporating refrigeration applications, Copeland launched its second generation of scroll compressors. Today, this generation has been expanded with a new range of highly efficient scroll compressors that will undoubtedly have a significant impact on the future development of refrigeration systems. The new ZF EVI scroll compressor, specially designed and optimized to maximize the benefits of liquid subcooling and vapor injection technology, is a key component in the design of high efficiency low temperature central refrigeration plants.
ZF EVI scroll compressors offer higher cooling capacity and coefficient of performance (COP) than available on the market, providing additional performance benefits and making it the preferred solution for food storage systems.This article describes the EVI scroll compressor concept , its main characteristics and applied aspects of use in refrigeration systems. Steam injection. The EVI scroll refrigeration cycle is similar to a two-stage intercooler cycle, but using a single compressor (see figure 1). This concept is much simpler and eliminates the additional losses that exist in a conventional two stage compression system. The principle of operation of the stage high pressure consists in the selection of a part of the condensed liquid and its subsequent evaporation after the expansion valve in a counter-current heat exchanger-subcooler (economizer). Next, the superheated steam enters through the intermediate injection ports in the cavity of the scroll block.
Additional subcooling increases the cooling capacity of the evaporator by lowering the enthalpy of the refrigerant at the inlet, while maintaining the same mass flow. The additional mass flow required for injection depends on the location of the port and creates an additional load, which slightly increases the power consumption of the scroll compressor. Therefore, the design of the injection port has been optimized in such a way as to provide a maximum increase in performance with a minimum increase in compressor energy consumption. It is well known that the efficiency of a two-stage compression cycle is higher than that of a single-stage one (with equal volumetric productivity).
An increase in compressor cooling capacity is achieved due to deeper subcooling of the liquid in the economizer with a slight increase in energy consumption for compressing a small portion of gas from intermediate pressure to discharge pressure. Interstage vapor cooling reduces the discharge temperature allowing the scroll compressor to operate at a higher pressure ratio. Previously, vapor injection has traditionally been used only in large commercial screw and multi-stage centrifugal compressors (but not in small hermetic ones). Copeland today introduces a new vapor injection compressor, part of the scroll family. It is specifically designed for low temperature applications and provides a level of efficiency comparable to that of a semi-hermetic Copeland Discus compressor, which last years was recognized as the most efficient compressor of all types in the world.
Scroll compressors have proven to be reliable, energy efficient and user-friendly compressed air units. In such compressors, the air is compressed by two spirals - one of them is stationary, and the second rotates at high speeds and moves at the same time. The movement of the movable spiral reduces the volume of the chamber where air is contained - and due to this, the density of the gas increases.
Application
Spiral installations allow you to get a stream of the highest degree of purification at the outlet: the air during the compression process does not come into contact with oil or other lubricants and, accordingly, does not mix with it. Therefore, scroll compressors are used in industries where particularly stringent requirements are imposed on air quality (medical and dental clinics, food and pharmaceutical industries, high-precision electronics, etc.). And the use of such equipment, coupled with dehumidifiers and additional filtering devices, ultimately allows you to get the best air flow in terms of quality.
Benefits of scroll compressors
Obtaining oil-free compressed air is important condition for many industries industrial production. Scroll compressors that operate from scroll elements and have a low noise level can cope with this task.
The speed of rotation of the spiral can reach several tens of thousands of cycles per minute. There are no touch points between the spirals and small gaps remain. Due to this feature, the working mechanisms of such compressors practically do not wear out and do not fail. However, there are quite stringent requirements regarding the accuracy of manufacturing such mechanisms, which makes the prices for scroll compressors quite high.
Main Applications of Scroll Compressors
This technique is used to make:
- Pharmaceuticals;
- food products;
- Household chemicals;
- medical equipment.
How to choose a scroll compressor?
You can buy a scroll compressor in our company. We sell only high-quality, certified equipment from well-known manufacturers.
You can ask all your questions to our manager.
Oil-free scroll compressors– equipment of the "latest generation", capable of ensuring the complete absence of compressed air oil impurities.
The scroll air compressor is a single-shaft positive displacement compressor. Working bodies this device are two spirals - movable and fixed, inserted into each other. During the operation of the unit, the moving spiral moves in a circular orbit around the fixed one. It should be noted that the movable spiral does not rotate around its own axis. This movement is provided to this element by a special anti-rotation device, as well as a shaft with an eccentric rotating in a given direction. This design contributes to a continuous reduction in the volume of the cavities, which ensures a constant uniform compression of the air. To reduce the duration of the starting torque, the device is equipped with a floating seal.
Thanks to design feature, this type of oil-free air compressor is distinguished by its reliability and the ability to evenly distribute the load on the scroll elements of the equipment.
Prona LLC offers you to buy oil-free scroll compressors, as well as accessories, spare parts and expendable materials to them. We carry out not only sales, but also service.
Our site presents oil-free scroll compressors of well-known manufacturers on the Russian market. The catalog contains air collectors trademarks Chicago Pneumatic and Remeza.
Scope of equipment
Are intended for use at those enterprises where use of the polluted compressed air is inadmissible.
Thanks to a large number undeniable advantages, scroll compressors have found their wide application in the manufacture of various refrigeration units as well as in air conditioning systems.
Since their invention and introduction into production, these devices have been actively used in Food Industry, in the manufacture of household and industrial systems air conditioning, as well as in the manufacture of refrigeration units.
Benefits of oil-free scroll compressors
The high demand for this type of compressors is easily explained by their characteristics and excellent performance:
- high coefficient of performance;
- low noise level;
- reliability in work;
- low vibration level;
- high level productivity;
- excellent performance characteristics.
Where to buy scroll compressors?
OOO "Prona" offers you to purchase scroll compressors in Moscow. It is the official representative in our country of many world leaders in production compressor equipment, we are pleased to offer you our delivery services and after-sales service. All products presented by us have the necessary certificates and guarantees. The price of a scroll compressor depends on the characteristics you need and the manufacturer of the equipment. We carry out delivery across all Russia.
Scroll compressors are single-shaft positive displacement machines. As is known, machines of this operating principle are reversible; can work practically without changing the design, both as compressors and as motors (expanders or expanders.
The idea of such a machine has been known for more than a hundred years, but it was only in the 80s of the twentieth century that it was possible to realize it and bring it to industrial production and widespread use. The reason is the same as in the development of screw compressors, there was not enough precise equipment to manufacture such a part shape as a spiral.
Currently in refrigeration scroll compressors are used in domestic and transport air conditioners, heat pumps, refrigerating machines low and medium power up to 50 kW. But calculations show that the refrigeration capacity of scroll compressors can be increased to 100 kW or more as their design and manufacturing technology improve.
28 Classification of scroll compressors
Scroll compressors are classified as follows: oil-filled; with the injection of a drip liquid (for example, a refrigerant); dry compression.
And, of course, one- and two-stage with a different arrangement of steps in relation to the engine.
Depending on the type of gas, power and other conditions: tight, glandless, stuffing box.
According to the type of spirals used: with involute spirals, with Archimedes spirals, with piecewise circular, etc.
The division of scroll compressors into vertical and horizontal is essential. In the latter, shaft 1 is located horizontally (see Figure 65). In horizontal scroll compressors, such as a transport air conditioner with a parallel arrangement of the shaft and the longitudinal axis of the vehicle, it is more difficult to ensure the reliable operation of the compressor lubrication system.
29 Advantages and disadvantages of scroll compressors
The main advantages of scroll compressors are:
1.High energy efficiency; their effective efficiency reaches 80-86%;
2.High reliability and durability, determined by the durability of bearings;
3.Good balance; slight change in torque on the compressor shaft; low gas speeds in the machine - all this ensures the machine runs with a low noise level.
4. Speed - the number of revolutions of the compressor shaft from 1000 to 13000, and this range is expanding.
5. No dead volume, low leakage rate, and therefore higher indicator efficiency; the gas sucked in by the compressor does not come into contact with the hot walls of the compressor parts;
6. The processes of suction, compression and discharge are “stretched” along the angle of rotation of the shaft and therefore, even at a high frequency of the shaft, the gas velocities are small.
7. Absence of valves on suction, and often on discharge;
8. A scroll compressor, like a screw compressor, can operate in a “recharging” cycle;
9. The scroll compressor, like all positive displacement compressors, can operate on any refrigerant, on any gas, and even with drip liquid injection.
Compared with reciprocating compressors of the same capacity, the scroll compressor has the following advantages:
The disadvantages of scroll compressors include the following:
1. Spiral machines require new parts for mechanical engineering - spirals, for the manufacture of which they need milling machines with CNC.
2. A complex system of forces acts on the movable spiral: axial, centrifugal, tangential, requiring competent calculation and balancing, and, consequently, balancing of the rotor.
3. If there is no discharge valve, then the theoretical indicator diagram of the scroll compressor will look the same as that of the screw compressor, with possible gas undercompression and overcompression, i.e. with additional losses.
