Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
  • F04B39/06—Cooling; Heating; Prevention of freezing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
  • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
  • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
  • F04B39/121—Casings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/08—Cooling; Heating; Preventing freezing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
  • F05C2251/00—Material properties
  • F05C2251/04—Thermal properties
  • F05C2251/048—Heat transfer

Definitions

• the present invention relates to a refrigeration compressor, and more specifically to a compressor whose cooling is performed by utilizing the characteristics of its thermal transient when such a compressor is applied to a refrigeration system.
• a compressor has the function of raising the pressure of a given volume of fluid to a pressure necessary to perform a refrigeration cycle.
• hermetic compressors that generally comprise a sealed housing on which compressor parts are mounted: a compressor-motor assembly comprising a cylinder block with an end closed by a head defining a discharge chamber in communication with a compression chamber defined within the cylinder, the compression chamber is closed by a valve plate provided between the cylinder end and the head.
• WO 2007/068072 uses the concept of insulation of cylinder heating sources.
• a conduit is constructed spacer over the valve plate and open into the internal cavity of the compressor housing, keeping the compressor cylinder cap away from the valve plate and forming an annular plenum around the spacer duct. In this way, heat transmission from the cylinder cover to the valve plate is reduced, which ultimately reduces the heating of the cylinder block in the region of the compression chamber, increasing the efficiency of the compressor.
• the conduit having a heat-absorbing end on the cylinder and another heat-releasing end disposed away from the cylinder block to absorb heat generated by compressing refrigerant within the cylinder and dissipating it to a remote region thereby decreasing the cylinder temperature and also increasing the efficiency of the compressor.
• the present invention aims to promote compressor cooling using characteristics of the compressor's thermal transient when applied to a refrigeration system.
• the present invention takes advantage of the existing thermal dynamics between the compressor and the compression system, reliably and efficiently reducing internal temperatures and thereby improving compressor performance.
• the present invention achieves the above objectives by means of an airtight compressor comprising a housing that surrounds the compressor component parts, with a heat accumulating material occupying an internal volume or adjacent to the compressor housing.
• the heat accumulating material acts as a thermal capacitor capable of absorbing high amounts of heat during the compressor on time and rejecting heat during the compressor off time in order to increase the thermal efficiency of the compressor.
• the heat accumulating material rejects heat a first amount of heat during the compressor on time and a second amount of heat during the compressor off time.
• the heat accumulating material may reject a minimum amount of heat during the compressor on time and a high amount of heat during the compressor off time.
• heat accumulating material can absorb heat during the compressor on time and discard part of this heat to one of the compressor components during the compressor off time.
• the heat accumulator material may be a latent heat accumulator or a sensitive heat accumulator, however, the use of a PCM (phase shift material) is particularly advantageous for the proposed inventive concept.
• PCM phase shift material
• PCM comprises all the material that at a given design temperature begins to receive latent heat, that is, a process at practically constant temperature, and with high heat absorption capacity.
• a PCM material is usually defined as a material that undergoes a change in the liquid phase and the solid phase, there are a few PCM material that, instead of phase shifting, change the structure of matter, these being PCM ' are called solid-solid.
• phase change is mentioned throughout the text, the PCM nomenclature also covers materials that change structure at a given design temperature, absorbing high heat rates.
• the heat accumulating material may occupy an idle volume inside the compressor, or even be part of the structure of at least one of the parts of the compressor. compressor.
• Figure 1 - Figure 1 illustrates a first constructive possibility for the refrigeration compressor of the present invention
• Figures 2 and 3 - Figures 2 and 3 illustrate result graphs of a numerical simulation indicating the heat removal obtained through the constructive possibility illustrated in Figure 1;
• Figure 4 - Figure 4 illustrates a second constructive possibility for the refrigeration compressor of the present invention
• Figures 5a to 5c - Figures 5a to 5c illustrate a third constructive possibility for the refrigeration compressor of the present invention
• Figure 6 - Figure 6 illustrates a fourth constructive possibility for the refrigeration compressor of the present invention
• Figure 7 - Figure 7 illustrates a fifth constructive possibility for the refrigeration compressor of the present invention
• Figure 8 - Figure 8 illustrates a sixth constructive possibility for the refrigeration compressor of the present invention
• Figure 9 - Figure 9 illustrates a seventh constructive possibility for the refrigeration compressor of the present invention
• Figure 10 - Figure 10 illustrates an eighth constructive possibility for the refrigeration compressor of the present invention
• Figures 11a to 11b - Figures 11a and 11b illustrate a ninth constructive possibility for the refrigeration compressor of the present invention.
• Figure 12 - Figure 12 illustrates a tenth constructive possibility for the refrigeration compressor of the present invention.
• the present invention will hereinafter be described in more detail based on the exemplary embodiments shown in the drawings. While the detailed description uses an alternative refrigeration compressor as an example, it should be understood that the principles of the present invention may be applied to any type, size or configuration of refrigeration compressor. Thus, the present invention may be applied to hermetic or semi-hermetic reciprocating compressors, rotary or scroll compressors or any type of refrigeration compressor capable of receiving a volume of a heat accumulating material acting as a thermal capacitor.
• the present invention is based on the use of elements capable of absorbing heat from hot components during the compressor operating period.
• the use of these elements directly impacts the temperature reduction of these components, increasing the thermodynamic efficiency of the compressor.
• the present invention reveals a compressor thermal management mechanism that makes use of the thermal behavior of its components when in a refrigeration system, achieving a decrease in compressor heating during its on period.
• high heat capacity elements is used herein to mean heat absorbing elements, and a different range of materials could be used for making such elements.
• the present invention is based on the use of heat accumulating materials occupying an internal volume or adjacent to the compressor casing and is not limited to an “independent element” to be inserted. in the internal space of the compressor.
• phase shifting heat absorbing elements work at practically constant temperatures during the heat absorption process (this enhances this absorption and prevents these components from heating the others as well).
• the operating temperature of these components is specified (by selecting a material with the desired phase change temperature), it is possible to adjust the operating temperature of the internal components to an optimal point based on system dynamics. , achieving greater control over the solution.
• phase shifting material is used during the heat absorption process (latent thermo-accumulator).
• These materials known as Phase Change Materials (PCMs), include paraffins, special greases, and other components that can be manufactured to phase-change at different design temperatures.
• PCMs Phase Change Materials
• solid-solid PCM changes in the structure of matter
• this process has a high energy absorption capacity with practically constant temperature, as opposed to a sensitive thermal accumulation process, which implies variations considerable temperatures.
• PCMs the use of other high heat specific materials may also be used as they are also able to absorb heat with slow temperature (sensitive heat accumulators).
• An example of a specific high heat material that can be applied to the extent of the advantages provided by the present invention is water.
• the present invention is based precisely on the addition of a heat accumulating material occupying an internal volume or adjacent to the compressor casing.
• this material either a PCM or any other material with high heat capacity
• this position must be determined according to the effectiveness in reducing internal component temperatures in the space available for allocate these components, the cost involved and the technological challenges to that end.
• the heat accumulating material acts as a thermal capacitor, absorbing high amounts of heat during the compressor on time and rejecting that heat during the off time.
• thermo capacitor can take two forms: it can absorb high amounts of heat by rejecting as little of the compressor on time as possible, then rejecting heat in an off time, or it can absorb large amounts of heat in an on time and maintain a uniform heat removal rate over the on and off times. In the latter form, although there is a heat rejection during the compressor on time, the energy removal generated is much greater during this same period, contributing to the lowering of the thermal profile.
• Figure 1 shows a first embodiment of the present invention, wherein the heat accumulating material is located in a volume formed between a cap surrounding the cylinder cover and the compressor cylinder cover.
• This cylinder cover region is a critical region for the compressor as it is where various gas communications pass.
• Suction gas to enter the cylinder passes through the suction muffler region in contact with the cylinder cap.
• High-temperature compression gas is also discharged into the cap from where it goes to the rest of the discharge system.
• the lid when cooled, absorbs more heat from the cylinder, which acts in favor of the thermodynamic efficiency of the compressor.
• FIG 1 a part of a compressor is illustrated, showing the cover 1 surrounding the lid 2 of the cylinder 3. Within the space formed between the cover 1 and the lid 2 a volume 4 is created, where the accumulator material is stored.
• heat (as mentioned earlier, this material can be a grease, a paraffin, another type of PCM, or even another high heat capacity material).
• the cover 1 may further comprise external fins 5.
• the option to add fins 5 derives from the system's own thermal dynamics: The heat input in this system is very intense as the gas from the cylinder cap collides with the walls of the lid at high speed, generating a high heat transfer rate. In order to reject heat to the compressor internal environment, gas velocities are slower, especially in compressor off time, when the internal gas only moves by natural convection. In order to be able to reject all heat absorbed at high rates in the on time period, the external heat transfer area is increased by the addition of the fins 5.
• the fins could be internal fins, adjunct to the thermo-accumulating material, which would facilitate the flow of heat along its structure. As some materials have low thermal conductivity, the addition of fins allows for the maximization of heat flow throughout the material. In addition, other solutions for maximizing heat transfer throughout the heat exchanger material could also be used within the scope of the present invention, such as porous metal matrices injected together with the heat accumulator.
• Figures 2 and 3 show graphs illustrating the results of the simulation performed (in figures, line A corresponds to the embodiment with the volume of heat accumulating material and line B corresponds to a conventional compressor).
• Figure 2 shows a graph illustrating the rejected heat from the cylinder cover to the compressor internal environment. Although it seems that the lid with the heat accumulating material dissipates more heat than the normal lid the heat removed from the gas should be analyzed. refrigerant inside the cylinder cover. This analysis, illustrated in figure 3, shows that during the compressor on time (ON time in the figure) the accumulator element dissipates approximately 3 W more than the normal cap, but during this same period the system removes 8 W more of the gas. . Thus, in the overall balance, a gas cooling is obtained, and therefore a lowering of the compressor thermal profile, which contributes to the increase of energy efficiency.
• the graphs in figures 2 and 3 can be interpreted by the following analysis of system behavior: Heat enters the accumulating material from a gas at high temperature and velocity. To discharge the same heat inside the compressor, more time is needed as it is discharged to a gas at a lower speed (low convection coefficient) and with a lower temperature potential. As such, it takes more than the compressor on time to close the heat charge and discharge time, and thus ends up having a continuous discharge process, but with a much more intense gas heat absorption in the compressor on period (period to be considered for the purpose of the present invention).
• FIG. 4 illustrates a second exemplary embodiment of the present invention.
• the heat accumulating material is added to the compressor discharge system.
• a heat accumulating material wrapper 6 is added to a discharge volume V downstream of the cylinder cap 2.
• a concentric cap 7 is welded to the discharge tube, creating a hermetic volume in which the heat accumulating material is deposited.
• One of the benefits of adding heat build-up material to the discharge path, either on the cylinder cover or some downstream component, is that depending on the design optimization, greatly reducing the gas temperature at the compressor outlet, it will have to reject less heat in the system condenser, which will lower the condensing temperature (and pressure), and therefore increase the efficiency of the overall cycle as the difference between the source temperatures is decreased. hot (condenser) and cold source (evaporator).
• such embodiment shown in figure 4 may include fins 5, preferably disposed externally and integrally with the concentric shell 7. The presence of these fins increases the external area and, consequently, assists the removal of heat during the compressor off time.
• internal fins could be added to maximize heat transfer along the matrix of the thermal accumulator.
• FIGS 5a, 5b and 5c show a third embodiment of the present invention, where heat accumulating material is employed externally to the compressor crankcase region 8.
• a phase shifting material volume 6 is arranged at the bottom of the compressor in a volume isolated from the internal environment of the compressor.
• This volume may take the form of a reservoir 9 to be closed by a glue welding process, or other forms which ensure the hermeticity of the region in question to ensure a seal between the internal volume of the compressor and the volume of the term accumulator. .
• this reservoir 9 may include metal fins 10 in the volume region of the heat accumulator, with the aim of facilitating heat transfer of the heat accumulator material to the external environment, maximizing the efficiency of the heat transfer process. heat discharge.
• FIG. 5a to 5c has two major advantages: When cooling the oil, passing through the other components of the compressor, being at a lower temperature, removes more heat from them, resulting in a cooling of these components (including the cylinder region and suction filter). If the compressor has a construction where cylinder and head are located near the oil, the effects of adding this type of accumulator in this region are even greater because the cooling of oil and surrounding regions reaches the compression cylinder more effectively. .
• compressor components in this case oil
• oil may undergo very different temperature regimes.
• a pull-down test critical situation
• the oil is extremely hot and in a power consumption test it is much colder.
• the oil viscosity is quite different in one regime and another, affecting the entire bearing design and not allowing precise optimization of these components.
• phase-shifting thermal accumulators at a given temperature allows them to be adjusted to remove more heat at high temperature regimes and thereby reduce the oil temperature at critical pull-down regimes. by approximating pull-down operating point temperatures and power consumption.
• variations in oil viscosity in the application are reduced, allowing for a more optimized bearing design, which ultimately increases the energy efficiency of the compressor.
• a fourth exemplary embodiment of the present invention involves the addition of heat accumulating material in a region on the outside of the compressor casing. such region being generated integrally with the compressor baseplate.
• Such an embodiment shown in Figure 6 comprises creating a wrapper 11 formed in correspondence with the compressor base plate 12, adjacent to the outside of the compressor crankcase region 8.
• the wrap body 11 takes advantage of part of the base plate 12, and facilitates the assembly assembly process.
• the outer wall of the wrap 11 may be provided with fins 13 for the purpose of facilitating heat transfer and maximizing the efficiency of the heat dissipation process to the external environment.
• a fifth exemplary embodiment of the present invention involves adding the heat accumulating material to a wrap 14 formed in the region of the compressor housing 8, the wrap 14 being internal to the compressor.
• This embodiment shown in Fig. 7, comprises a wrapper partially defined by the inner wall of the housing and an additional wall 15, the wrapper 14 thus defined being in a region immersed in the compressor oil.
• the wrapping wall 14 may be provided with fins 16 for the purpose of facilitating heat transfer and maximizing process efficiency.
• the application of oil heat accumulators in the crankcase region may have two major advantages, according to the focus of that application:
• the thermal accumulator material intensifies the amount of heat it removes from the components, allowing a reduction in the compressor's temperature levels, resulting in increased energy and volumetric efficiency. .
• the application of the thermal accumulator in the crankcase region has the facility of having the entire base region of the housing plus the base plate as dissipating elements of the heat stored during the compressor operating time, which makes the capacitor discharge process easier to perform.
• a latent thermal accumulator (specifically a phase change material - PCM) is very interesting for this scenario, because, besides In order to be used in order to lower the suction chamber and cylinder temperatures, this material could be used for oil temperature control and modulation.
• a latent thermal accumulator specifically a phase change material - PCM
• PCM phase change material
• FIGS. 5 and 6 where the heat accumulating material is disposed in a region near the housing, have advantages similar to those described above over the embodiment of FIG. 7.
• Figure 8 shows a sixth exemplary embodiment of the present invention where heat accumulating material is added to the suction muffler.
• a wrapper containing heat accumulating material 18 is provided in the suction tube 19 of the suction filter 20 of the compressor.
• the heat accumulating material acts to cool the gas as it passes through tube 19, decreasing its temperature at the cylinder inlet, with a consequent increase in volumetric and energy efficiency.
• the phase change temperature should be less than the gas temperature in the pipe region to generate a favorable heat removal temperature potential.
• the heat accumulator material could be a sensitive heat accumulator (eg water or oil), in which case the design needs to be well designed taking into account temperature variations both in the process of absorption, as in the process of heat dissipation by the thermal accumulator matrix.
• the option of applying the thermal accumulator to the suction muffler can be explained by the characteristics of the system: an important source of compressor energy inefficiency is gas overheating during suction, and is based on useless heating of the gas during the travel of the compressor. suction dowel up to the compression cylinder. Important increases in efficiency have been observed in the past with the change of metal suction filters by plastic suction filters. Today virtually all compressors for household refrigeration application apply plastic filters, but even so the Gas temperature at cylinder inlet is about 20 to 30 ° C higher than temperature at compressor inlet.
• thermoaccumulating material acts to cool the gas as it passes through the suction tube 19, decreasing its temperature at the cylinder inlet, with consequent increase in volumetric and energy efficiency.
• phase change temperature should be less than the gas temperature in the pipe region to generate a favorable heat removal temperature potential.
• a sensitive heat accumulator water or oil for example
• the fins present in the drawing are only a constructive option and may or may not exist depending on the design of the application of the thermal accumulator.
• the presence of such fins comes with the objective of intensifying the heat removal (by increasing the area) of the pipe gas to the thermo-accumulator region.
• Combined suction filter material solutions and heat accumulators can be developed to maximize heat removal performance.
• a suction cap which contains, for this project, the suction tube
• metallic material eg steel or aluminum
• Figure 9 shows a seventh exemplary embodiment of the present invention, wherein heat accumulating material is applied to the region of the compression cylinder 3.
• retention channels 23 for heat accumulating material 24 are formed along the cylinder. As shown in the figure, the channels 23 may be closed by sealing the head itself 22. However, the channels may alternatively be closed by welding, gluing, or any other suitable means.
• the heat accumulator material is a latent fear accumulator (PCM)
• PCM latent fear accumulator
• a material with a phase change temperature greater than continuous operating temperature but lower than during critical operating periods to adjust the proper operation of the thermal accumulator at steady state.
• operating conditions such as under high thermal stress regimes.
• This would have the benefit of product robustness, as allowing the cylinder 3, piston 21 and oil in this region to work cooler under these regimes improves the lubrication and bearing process.
• efficiency can be increased indirectly, as by having more robustness in extreme conditions, some design criteria can be relaxed (such as reducing oil viscosity, as at high temperatures PCM ensures adequate viscosity). ), allowing better operation of the compressor under normal operating conditions.
• the presence of the fins is optional and dependent on the project in question.
• the fins 25 were added with the aim of facilitating the thermal discharge, by increasing the exchange area, of the thermal-accumulating matrix (which may be latent - PCM - or sensitive) since the loading thermal, due to the high convection inside the cylinder, is more intense than the internal environment side of the compressor.
• Figure 10 shows an eighth exemplary embodiment of the present invention, where heat accumulating material is added to a wrapper or cylindrical jacket 27 of the compressor electric motor (see Figure 10, where numeral 25 indicates the rotor and numeral 26 the stator ).
• such cylindrical sleeve 27 is interference-mounted on the outer region of stator 26 to minimize the inherent thermal resistances of these types of mounting.
• the engine warms up, and when it reaches a certain working temperature specified in the application of the thermal accumulator, it would absorb the heat dissipated by the engine, forcing it to work at a lower temperature than it would work. without the presence of the thermal accumulator.
• the presence of the thermal accumulator prevents the heat dissipated in this component from reaching the internal environment of the compressor, causing cavity temperature reductions, and indirectly energy losses due to gas overheating.
• Another advantage of this solution is the possibility of guaranteeing the reliability of compressors that work in a critical temperature regime, such as compressors with low electrical efficiency, in order to save steel and especially copper (low cost compressors).
• FIGs 11a and 11b show a ninth exemplary embodiment of the present invention where heat accumulating material is applied to the suction dowel 28, the discharge dowel 29, or both suction and discharge dowels 28,29. (dowels)
• the application of heat accumulators to the suction drawer has at least two advantages.
• the first concerns the overheating of the suction gas even before entering the compressor, due to the heating of this strainer by the higher temperature housing. This heat flow when walking through the strainer encounters less resistance in the suction gas, which has a much higher heat transfer coefficient than the outside, as the latter is typically CHARACTERIZED as natural convection.
• the addition of heat-accumulating material in a wrapper 30 around the suction dowel 28 seeks to create a preferred path for the heat flux from the casing, other than the suction gas.
• the addition of fins 31 may increase the exchange area for the thermal accumulator.
• thermo-accumulating element Another advantage of this application is that it creates an obstacle to heat from the discharge dowel 29, which is much hotter than the suction dowel 28 and the housing itself.
• suction and discharge dowel 28 are very close 29 (see, for example, the illustrated exemplary embodiment).
• a thermal short circuit is to be expected as there is a high temperature gradient between the exhaust gas and the suction gas.
• the presence of this thermo-accumulating element also acts to create a preferential path to heat from this component.
• thermo-accumulator 32 to the discharge dowel 29, generating a preferred heat path other than that which carries this thermal energy to the suction region.
• the presence of the fins 33 fulfills the role of facilitating this heat transfer to the heat accumulator matrix.
• thermal accumulator 32 Another intrinsic advantage of applying the thermal accumulator 32 to the discharge pass 29 is the lowering of the discharge gas temperature because the thermal dissipation for this accumulator becomes intensified.
• the condenser size can be reduced (cost reduction) or, if the condenser size is maintained, the pressure and saturation temperature in the condenser decreases, increasing the cycle efficiency.
• thermodynamic As possible constructive variants, the envelope for the thermal accumulator could be made of metal and / or plastic, being that in the metallic version it could be welded or in the housing and the dowel. In the case of the plastic option, glue would be the first viable option.
• Figure 12 shows a tenth exemplary embodiment of the present invention, where heat accumulating material is applied to the top 35 of the compressor casing.
• a preferably metallic plate 36 is superimposed on the compressor cover, such components being joined by any suitable means (e.g. welding or gluing), ensuring the creation of an airtight wrap to house the accumulator material. heat 37.
• plate 36 may comprise fins 38, which aim to increase the heat exchange area.
• inventive concept underlying the present invention lies precisely in taking advantage of the thermal dynamics existing between the compressor and the refrigeration system to achieve a reliable and efficient reduction of the internal temperatures of the compressor and, consequently, to improve the compressor performance.
• This inventive concept is performed by a refrigeration compressor comprising a heat accumulating material that acts as a thermal capacitor in order to increase the thermal efficiency of the compressor.
• any type of heat accumulator material e.g., a latent heat accumulator or a sensitive heat accumulator
• PCM phase shift material
• the position of the heat accumulator material and the means of use thereof in the construction of the compressor are design dependent characteristics of the compressor, and the embodiments illustrated in the detailed description are only examples of possible embodiments.
• the figures show embodiments in which the heat accumulating material (preferably a PCM) is applied in an idle volume within the compressor housing - either in a specifically formed wrapper, in a space formed between components. or even in confined spaces formed within the compressor components, or in a volume externally adjacent to the compressor casing. It should be noted, however, that the present invention is not limited to the constructive possibilities described herein.
• the present invention may, instead of utilizing a volume created between two plates, for example, use an elastic PCM material contained within (“rubber sheet”), which material could be attached to the compressor casing, by glue or other means of adhesion.
• rubber sheet an elastic PCM material contained within
• This variant would allow the exchange of PCM material over time.
• the heat accumulating material (preferably a PCM) could, for example, be directly used in the manufacture of one of the compressor components or in the compressor housing.
• the fins provided in the described embodiments may be external, as shown in the figures, or internal, adjoining the heat-accumulating material, to facilitate heat flow along its structure.
• the addition of fins allows for the maximization of heat flow throughout the material.
• other solutions for maximizing heat transfer throughout the thermo-accumulator material could also be used within the scope of the present invention, such as porous metal matrices injected together with the thermo-accumulator.
• While the present invention may use any type of heat accumulator material, the following examples of PCM material that may be used within the scope of the present invention are listed for information purposes: models RT52 and RT65 by manufacturer Rubitherm Technologies GmbH, models Plus Ice - S58 and S72 (hydrated salt-based PCM solutions) and Plus Ice models A55, A62 and A70 (organically based PCM solutions) from Phase Change Material Products Limited, and Climsel C58 and Climsel C70 models from Climator Sweden AB.

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• 2009
  • 2009-11-10 BR BRPI0904785-9A patent/BRPI0904785A2/pt not_active IP Right Cessation
• 2010
  • 2010-11-09 WO PCT/BR2010/000373 patent/WO2011057373A1/pt active Application Filing
  • 2010-11-09 CN CN2010800584065A patent/CN102667157A/zh active Pending
  • 2010-11-09 EP EP10803207A patent/EP2500567A1/en not_active Withdrawn
  • 2010-11-09 KR KR1020127014120A patent/KR20120103605A/ko not_active Application Discontinuation
  • 2010-11-09 US US13/509,266 patent/US20130045119A1/en not_active Abandoned

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