JP2014507625A - Compressor cooling system using heat exchanger precondenser and compressor provided from the cooling system - Google Patents

Abstract

  The present invention in the field of refrigeration equipment is designed to allow for unexpected structure and operation and is more efficient than that achieved by using existing similar equipment. The invention comprises a compression cylinder (3) in which a compression cylinder (3) is located, while an inflow pipe (5) from the evaporator and a shell (2) from which a discharge pipe (6) leading the fluid to the condenser projects. A machine (1) and a fluid supply by a pipe (8) from a compression cylinder (3) which is coupled to the compressor (1) and located in the compressor (1) and is provided with a discharge pipe (11) Two pre-condensers (7) and in the external region of the compressor (1) and cooperate with the pre-condenser (7) via the discharge pipe (11) of the pre-condenser (7) And (1) a heat exchanger (91) including a tube attached around the shell (2).

Description

  The present invention relates to a compressor cooling system by using a pre-condenser, more specifically a micro-compressor, which relates to the field of refrigeration equipment and is more efficient achieved by using known systems. Designed to allow typical behavior.

  As is known in the art, a refrigeration cycle typically consists of a compressor that converts low pressure gas into high pressure and high temperature gas entering the condenser, where such gas is at a high pressure. It becomes a supercooled liquid, which then enters the expansion device and the fluid pressure is reduced to lead to the evaporator. The evaporator converts the supercooled liquid to low pressure saturated vapor, which is further led into the suction line, reenters the compressor and begins a new refrigeration cycle.

  The compressor, by virtue of its operating characteristics, usually constitutes the hottest part of the refrigeration system, the temperature of that part being a function of the room temperature where the system is located. However, when the room temperature is too high, there is a limit that can estimate the internal temperature of the compressor. Moreover, the operating temperature of the compressor also affects the bearing design used with the compressor, and the compressor should be subjected to strict approval tests to withstand operation under such conditions. Furthermore, most of the inefficiency of the compressor is related to the resulting overheating of the cooling gas in its flow path between the intake valve and the compression cylinder, as well as the heating of the coolant during its compression.

  Heating of the coolant through the suction path is caused by heat exchange with the compressor component, which is hotter than the coolant fluid. Secondly, the heating of the coolant during the compression process is mainly due to the addition of such action by the piston and also from the heated part from the cylinder wall in the initial stage of compression.

  With regard to heating during compression, if the heat exchange between the wall and the cylinder is increased, such heating could be avoided from the moment the coolant temperature exceeds the temperature of the cylinder wall. However, because the compression is too fast and the heat exchange area is small, the heat exchange is insufficient to avoid heating, resulting in a high coolant temperature value at the end of compression. In addition, the cylinder wall temperature is high, which increases the coolant heating time throughout the compression cycle.

  As a result of coolant heating during compression, the heated coolant becomes the greatest heat source of the compressor and is a major source of heating of the compressor components and thus the coolant along the suction path. Thus, an effective solution that can cool the coolant during its compression process or reduce the gas temperature after compression (heat source reduction) affects the compression efficiency and, consequently, during inhalation Affects losses due to coolant overheating.

  Several technical solutions have been developed to achieve this goal. Among them, EP 0173013 discloses the use of an external heat exchanger located in the system suction line to reduce the gas temperature before entering the compressor, It does not provide any form that attenuates the gas heating that occurs during the step.

  On the other hand, U.S. Pat. No. 4,936,112 discloses a compressor with only an internal heat exchanger that includes a plurality of resistance plates (or possibly coils) welded together that only allows the temperature of the compressor motor to be reduced. Is described.

  Japanese Patent No. 5209596 discloses a technique for cooling the compressed gas exiting the compressor and reducing the temperature of the compressed gas by reducing the temperature inside the compressor, thereby returning the compressed gas to the inside of the compressor. It describes a rotary compressor having an element named “precooler”. This rotary compressor is limited in efficiency because the temperature reached by the device during operation is high. Similarly, U.S. Pat. No. 5,439,358 describes the use of a gas recirculation duct that couples to a manifold having a plurality of heat exchangers, but the heat exchanger is such that air is drawn from such a duct. Does not effectively reduce the temperature of the air compressor flowing into the.

  Thus, while the solutions used in the current state of the art reduce the gas temperature, they do not provide a more direct and more effective means of additionally and simultaneously cooling the compressor unit itself. Please keep in mind.

European Patent No. 0173013 U.S. Pat. No. 4,936,112 Japanese Patent No. 5209596 US Pat. No. 5,439,358

  In view of the above disadvantages and for the purpose of solving them, one of the objects of the present invention is to provide a cooling system that removes heat from the compressor surface to reduce the gas temperature during the compression process. Is to provide.

  Another object of the present invention is to exhaust heat from the compressed fluid to the external environment, and by using an external heat exchanger that functions as a pre-condenser, at the same time as cooling the compressor itself, It is to provide a cooling system that can reduce gas overheating.

  The presented system further comprises an external heat exchanger wound on the compressor, which is due to the two-phase fluid evaporation process and the mechanism of heat exchange by conduction in the component to be cooled. Is very effective. This establishes the surface temperature of the compressor (and thus the internal components of the compressor) close to the saturation temperature of the precondenser, allowing the compressor to operate at high room temperature.

  Yet another object of the present invention is to disclose a compressor cooling system that can reduce productivity loss due to overheating during suction, in addition to improving the energy efficiency of the compressor.

  The present invention achieves the above objectives by a compressor cooling system using a pre-condenser according to a preferred embodiment of the present invention, wherein the compressor cooling system has a compression cylinder located therein, while from the evaporator. A compressor consisting of an inflow pipe and a shell from which a discharge pipe leading the fluid to the condenser protrudes, and a fluid supplied by a pipe from a compression cylinder coupled to the compressor and located in the compressor, and at least comprising a discharge pipe One precondenser and a heat exchanger that is inside the external region of the compressor and cooperates with the precondenser via the precondenser discharge pipe.

  According to a preferred embodiment of the present invention, the external heat exchanger includes a tube fixed around a compressor or microcompressor shell.

  Optionally, the system presented is continuous with an additional internal heat exchanger located in the compressor and cooperating with the precondenser via a spring tube connected to the end of the precondenser discharge tube. Such an internal heat exchanger is located in the shell and is located near the hot part of the compressor, where applicable, preferably near the compression cylinder or compression cylinder cap. The The internal heat exchanger receives fluid from a pre-condenser or from an external heat exchanger via a spring tube connected to the end of the pre-condenser discharge pipe, and is processed in the pre-condenser. Through the discharge spring tube to the discharge tube.

  The invention further comprises a compressor or microcompressor comprising a shell in which a compression cylinder is positioned, while an inflow pipe from the evaporator and a shell from which a discharge pipe leading the fluid to the condenser projects. And at least one precondenser with a discharge pipe, which is fluid-fed by a pipe from a compression cylinder located in the compressor, and inside the external area of the compressor, and preliminarily through the precondenser discharge pipe A compressor with a cooling system including a condenser and a cooperating heat exchanger;

  In a possible embodiment of the present invention, such a compressor with a cooling system further comprises a precondenser via a spring tube located in the compressor and connected to the end of the precondenser discharge tube. Can further include at least one internal heat exchanger cooperating with.

  Therefore, the object is achieved by a compressor cooling system including means for reducing the temperature of the heat source of the compressor device, thus reducing the initial compression temperature and improving the compression efficiency.

1 is a schematic perspective view of a diagram illustrating a compressor working with a pre-condenser and an external heat exchanger constructed in accordance with a preferred embodiment of the present invention. FIG. FIG. 2 is a schematic diagram showing a refrigeration system constructed according to the preferred embodiment of the present invention shown in FIG. 1. 1 is a front view of a heat exchanger coupled to a compressor constructed according to a preferred embodiment of the present invention. FIG. It is a top view of the apparatus shown in FIG. FIG. 7 is a front view with a partial cross-section in the longitudinal direction of an alternative embodiment of a compressor additionally provided with an internal heat exchanger coupled to a compressor cylinder cap provided from a refrigeration system. FIG. 6 shows a schematic partial cross-sectional view in the transverse direction of FIG. 5 illustrating a second possible embodiment of the present invention with an internal heat exchanger coupled to the compressor cylinder.

  The invention will be described in more detail below on the basis of embodiments shown in the accompanying drawings.

  As shown in FIG. 1, a compressor cooling system using a heat exchanger and a precondenser, which is an object of the present invention, is located in a compressor 1 coupled to a precondenser 7 and a shell 2 of the compressor 1. And a heat exchanger 91 cooperating with the pre-condenser 7.

  FIG. 5 shows that the compressor 1 is localized with its respective cap 4 localized except in the case of using a compression cylinder 3 and a micro-compressor without an inner cap in the evaporator (not shown). And a precondenser 7 with which the compressor 1 cooperates. The shell 2 protrudes from an inflow pipe 5 from the pipe and a discharge pipe 6 which leads the already compressed and processed fluid to a condenser (not shown). It further comprises pipes (or pipes) 8 and 1 to be connected, and clearly shows that the precondenser 7 is fluid-fed by a pipe 8 from a compression cylinder 3 located in the compressor 1. 5 and 6 will be better understood.

  According to the preferred embodiment of the invention shown in FIGS. 1 and 2, the heat exchanger 91 is arranged around the shell of the compressor or microcompressor 1 in whole or in part. It consists of a pipe.

  According to such a structure, the precondenser 7 operates at the same condenser temperature that the refrigeration system operates, so that the compressor 1 covered by the heat exchanger 91 is arranged around the compressor 1. The evaporative heat exchange that takes place in the pipe 91 is surely having a low temperature close to the condensation temperature.

  Both the compressor cooling system and the compressor itself with the cooling system include an additional heat exchanger 9 positioned in the compressor 1 and operate continuously with the heat exchanger 91 and the precondenser 7. It is worth noting that you may.

  Such an additional internal heat exchanger 9 is preferably located in the shell 2 close to the hot part of the compressor 1, and the internal heat exchanger 1 is at the end of the discharge pipe 11 of the precondenser 7. The fluid should be received from the precondenser 7 via the connected spring tube 10 and the fluid processed in the precondenser 7 should be directed to the discharge tube 6 through the discharge spring tube 12.

  FIG. 5 shows a first structural possibility of the additional internal heat exchanger 9 in which the additional internal heat exchanger 9 operates in connection with the compression cylinder 3 of the compressor 1.

  If another embodiment of the invention is shown in FIG. 6 and available (note that the microcompressor does not have an inner cap), an additional internal heat exchanger 9 is connected to the cap 4 of the compression cylinder 3. Has been.

  The system of the present invention uses the gas itself compressed and pumped by the compressor 1 to transfer heat from inside the compressor 1 to the outside environment. In general, the gas used passes through its flow path in the compressor 1 through the cap 4 of the compression cylinder 3, the discharge filter, the discharge pipe and finally the discharge pipe 6 to a condenser (not shown).

  As the compressed gas exits the compressor 1, it passes heat through the precondenser 7 to the external environment where the coolant is carried to the saturation zone. The coolant temperature at the end of the precondenser 7 which can be considered here biphasic is the condensation temperature of the refrigeration system itself. As the coolant exits the heat exchanger 7 with a lower degree of energy (enthalpy), it returns to the compressor 1 and is directed through pipes 91 along all outer surfaces of the shell 2 of the compressor 1. . The biphasic coolant then replaces the sensitive latent heat with the heated body in the compressor, lowering the compressor temperature. After performing the heat exchange, this fluid is then directed to the discharge pipe 6 that forms the interface of the compressor 1 with the other components of the refrigeration system.

  It is worth emphasizing that the heat exchanger 91 has the function of removing heat from the hot part of the compressor 1 and consequently reducing losses due to gas overheating in the suction passage and during compression. Use of the heat exchanger 91 further correlates the shell temperature of the compressor 1 with the condensation temperature and then prevents the compressor 1 from collapsing when operating at high room temperature.

  Furthermore, the precondenser 7 allows the compressor surface temperature to be kept very close to the system condensation temperature, which is difficult to achieve with ventilation alone.

  If the system presented uses an additional internal heat exchanger 9, examples of components that can be cooled include the compression cylinder 3 and the cap 4 of the compression cylinder 3.

  As shown in FIG. 6, when the component to be cooled is the compression cylinder 3, the compressed fluid exits the compressor 1 through the tube 8 and exhausts heat into the precondenser or external heat exchanger 7. Then, it returns to the compressor 1 through the discharge pipe 11 of the precondenser 7. When reentering the compressor 1, the cooled fluid is led through the spring tube 10 to the internal heat exchanger 9 connected to the compression cylinder 3. Upon exiting the internal heat exchanger 9, the fluid is routed through another spring tube 12 to the discharge tube 6, which is the interface through which the compressed fluid is routed to the condenser or refrigeration system.

  The heat exchanged in the compression cylinder 3 lowers the wall temperature of the cylinder 3 and the fluid temperature in the suction chamber S. Thus, in addition to the incoming coolant fluid cooling the cylinder 3, heating in the cylinder 3 is reduced, heat exchange to the wall during compression is maximized, and the thermodynamic efficiency of the compression process is increased. Become bigger.

  Alternatively, as shown in FIG. 5, an internal heat exchanger 9 can be coupled to the cap 4 (if available) of the compression cylinder 3. In this structure, the compressed fluid exits the compressor 1 through a supply pipe (pipe) 8 of the precondenser 7, discharges heat into the precondenser 7, and returns to the compressor 1 through the pipe 11. . When reentering the compressor 1, the cooled fluid is led through the spring tube 10 to an internal heat exchanger 9 connected to the cap 4 of the compression cylinder 3. Similar to what happens in the previous embodiments, upon exiting the internal heat exchanger 9, the fluid is directed through another spring tube 12 to a discharge tube 6 that directs the compressed fluid to the condenser of the refrigeration system. It is done.

  The heat exchanged in the cap 4 of the cylinder 3 lowers the temperature of the compressed gas inside the head and in all parts. Since the compressed gas is the main heat source of the compressor 1, when the temperature of the compressor 1 is lowered, the overall temperature of the components of the compressor 1 is lowered. Thus, as the initial compression temperature decreases, the result is an increase in the thermodynamic efficiency of the compression process.

  The advantages of using a compressor cooling system with a pre-condenser 7, which is the object of the present invention, relate to reliability and energy efficiency aspects. In terms of reliability, cooling of the hot part of the compressor 1 caused by the proposed system avoids critical temperatures that could cause deterioration of the oil present in the compressor 1 and irreversible changes in its thermal physical properties. Is done.

  However, the greatest advantage is related to the increased energy efficiency of the compressor 1. By transferring heat from the hot part of the compressor 1 to the external environment, gas overheating is reduced in the suction path, resulting in an increase in the density of the coolant at the beginning of the compression process, which in turn is compressed by the compressor 1 and pumped. Increased mass. Therefore, the coefficient of performance (COP) of the compressor 1 increases.

  The proposed solution also creates advantages for the operation of the overall refrigeration system. By adding the pre-condenser 7, the heat exchange to the external environment is greater, and as a result, the temperature of the coolant circulating through the discharge pipe 6 is lower. Thus, if the coolant is sent to the cooling system at a lower temperature, the condenser becomes too large and the condensation system pressure drops.

  Therefore, this reduces the temperature difference required for heat exchange, thus increasing the efficiency of the refrigeration cycle. Furthermore, because the condenser becomes too large, the pull-down peak pressure also drops, which is a very important situation for the compressor 1 that can destroy the proper charge and excess temperature in the compressor 1.

  While a preferred structural method of the present invention has been shown, it will be understood by those skilled in the art that any omissions, substitutions and structural changes may be made without departing from the spirit and scope of protection in the claims. It is worth saying. It is also specified that all combinations of elements performing the same function in substantially the same way to achieve the same result are within the scope of the invention. Replacement of the elements of the embodiments described by others is also fully contemplated and contemplated.

  However, the description provided on the basis of the above figures relates only to some of the possible embodiments of the system of the invention, the actual scope of the object of the invention being defined in the appended claims. Please understand that it is.

Claims (8)

A compressor (1) comprising a shell (2) in which a compression cylinder (3) is located, while an inflow pipe (5) from the evaporator and a discharge pipe (6) leading the fluid to the condenser protrude. When,
At least one precondenser (7) connected to the compressor (1) and fluid-fed by a pipe (8) from a compression cylinder (3) located in the compressor (1) and provided with a discharge pipe (11) )When,
A heat exchanger (91) located inside the external region of the compressor (1) and cooperating with the precondenser (7) via the discharge pipe (11) of the precondenser (7). And compressor cooling system.   The cooling system according to claim 1, characterized in that the heat exchanger (91) comprises a tube mounted around the shell (2) of the compressor (1).   A precondenser (7) and a heat exchanger (91) cooperate with at least one additional internal heat exchanger (9) located in the compressor (1), the internal heat exchanger (9) 2. Cooperating with the precondenser (7) via a spring pipe (10) attached to the end of the discharge pipe (11) of the precondenser (7). Cooling system.   An additional internal heat exchanger (9) is located in the shell (2) and is positioned with the hot part of the compressor (1), and an additional internal heat exchanger (9) is connected to the precondenser ( 7) receives the fluid through the spring pipe (10) attached to the end of the discharge pipe (11) of the precondenser (7) and treats the fluid processed in the precondenser (7). 4. Cooling system according to claim 3, characterized in that it leads to the discharge pipe (6) through the discharge spring pipe (12).   5. Cooling system according to claim 3 or 4, characterized in that an additional internal heat exchanger (9) is coupled to the compression cylinder (3).   6. An additional internal heat exchanger (9) is connected to the cap (4) of the compression cylinder (3), if available, according to any one of claims 3 to 5. Cooling system. Compressor or microcompression consisting of a shell (2) in which a compression cylinder (3) is located, while an inflow pipe (5) from the evaporator and a discharge pipe (6) leading the fluid to the condenser project Machine (1),
At least one precondenser (7) connected to the compressor (1) and fluid-fed by a pipe (8) from a compression cylinder (3) located in the compressor (1) and provided with a discharge pipe (11) )When,
A heat exchanger (91) located inside the external region of the compressor (1) and cooperating with the precondenser (7) via the discharge pipe (11) of the precondenser (7). Compressor provided from the cooling system.   The compressor (1) includes at least one additional internal heat exchanger (9) located in the compressor (1), the additional internal heat exchanger (9) being a precondenser (7). 2. The compressor according to claim 1, wherein the compressor cooperates with a pre-condenser (7) via a spring tube (10) attached to the end of the discharge pipe (11).

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