KR20140027933A - Compressor cooling system using heat exchanger pre-condenser, and compressor provided from a cooling system - Google Patents

Abstract

The present invention in the field of refrigeration equipment is designed to allow unexpected configuration and operation and is more efficient than what has been achieved by using existing similar equipment. The present invention consists of a shell (2) in which a compression cylinder (3) is located, wherein the compressor (2) projects from the shell (2) an inlet tube (5) from the evaporator and a discharge tube (6) which guides the fluid into the condenser. (One); At least one precondenser (7) connected to the compressor (1) and supplied by a pipe (8) from a compression cylinder (3) located in the compressor (1), and equipped with an outlet tube (11); And a tube located inside the outer region of the compressor 1 and interacting with the precondenser 7 via an outlet tube 11 of the precondenser 7 and attached around the shell 2 of the compressor 1. It consists of a heat exchanger 91 comprising them.

Description

Compressor cooling system using a heat exchanger precondenser, and a compressor provided from the cooling system {COMPRESSOR COOLING SYSTEM USING HEAT EXCHANGER PRE-CONDENSER, AND COMPRESSOR PROVIDED FROM A COOLING SYSTEM}

The present invention relates to a compressor cooling system-more particularly a microphone compressor-by using a pre-condenser, which exists in the field of cooling equipment, which has been designed to enable more efficient operation than that achieved by using known systems.

As is known in the art, a cooling cycle generally consists of a compressor that converts low pressure gas into high pressure and hot gas entering a condenser, where the gas is then further guided through a suction line It is a high pressure differential cooling liquid, which enters the compressor and enters an expansion device that reduces the fluid pressure to lead the subcooled liquid to an evaporator that will convert it into a low pressure-saturated vapor to enter a new cooling cycle.

Due to the operating characteristics, the compressor usually constitutes the hottest part of the cooling system, the temperature of which is a function of the room temperature at which the system is located. However, the internal temperature of the compressor has a limit that can be estimated in case of too high room temperature; In addition, the operating temperature of the compressor will also be used with it and affects the bearing design that must be submitted to harsh approval tests to withstand operation under the above conditions. Moreover, most compressor inefficiencies are related to the coolant heating during compression, as well as the resulting coolant gas overheating in the path between the compression cylinder and the suction valve.

Heating of the coolant through the suction path is caused by heat exchange with the compressor component, which is hotter than the coolant fluid. As a result, the coolant heating in the compression process occurs mainly due to the addition of work imposed by the piston and also the heat part from the cylinder wall in the initial stage of compression.

For heating during compression, from the case where the coolant temperature exceeds the temperature of the cylinder wall, the heating can be avoided if the heat exchange between the cylinder and the wall is enhanced. However, because the compression is too fast and the heat exchange area is small, heat exchange is insufficient to avoid heating, leading to high coolant temperature values at the end of the compression. In addition, the temperature of the cylinder wall is too high, which extends the cooling heating time beyond the compression cycle.

As a result of the coolant heating during compression, the heated coolant becomes the largest source of heat of the compressor, which is the primary cause for heating the compressor components, and thus the coolant is heated along the suction path. Thus, an effective solution (reducing the heat source) to allow cooling of the coolant during the compression process or to reduce the gas temperature after compression will affect the compression efficiency and thus the loss due to overheating of the coolant during suction. will be.

Some technical solutions have been developed to achieve this goal; Among them, document EP0173013 does not provide any form of weakening of the gas heating occurring during the compression step, but provides for the use of an external heat exchanger located in the system suction line to reduce the gas temperature before entering the compressor. What is disclosed is present.

On the other hand, document US4936112 describes a compressor equipped only with an internal heat exchanger comprising a plurality of resistance plates (or possibly coils) welded to each other exclusively aimed at reducing the temperature of the compressor motor.

Document JP5209596 has an element named "precooler" which cools the compressed gas exiting the compressor and redirects it back to its interior even though it is directed to reducing the compressor internal temperature through the gas having a weakened temperature. Describe the rotary compressor-this shows a limitation in efficiency due to the high temperatures achieved by the equipment during operation. Similarly, document US5439358 describes the use of a gas recirculation duct in connection with a manifold having a plurality of heat exchangers, although this does not effectively reduce the temperature of the air compressor which cuts air into the duct therefrom.

Thus, it is noted that the solutions adopted in the present state of the art do not provide a means for additional and simultaneous cooling of the compressor equipment itself in a more direct and efficient manner, but it is directed towards the reduction of gas temperature.

In view of these shortcomings, it is one of the objects of the present invention to provide a cooling system which aims at removing heat from the compressor surface in order to reduce the gas temperature during the compression process.

Another object of the present invention is to reduce the gas overheating in the suction path at the same time for the cooling of the compressor itself, through the use of an external heat exchanger which serves as a precondenser to dissipate heat from the compressed fluid to the external environment. To provide a cooling system.

The system presented further provides for the presence of an external heat exchanger, packaged on a compressor, which is quite efficient due to the evaporation process of the two-phase fluid and the mechanism of heat exchange by conduction in the component to be cooled. From there, the surface temperature of the compressor (and thus its internal components) close to the precondenser saturation temperature is set, enabling the compressor operation for high room temperature.

It is a further object of the present invention to disclose a compressor cooling system that, in addition to improving compressor energy efficiency, can reduce productivity losses due to overheating in suction.

According to a preferred embodiment of the present invention, there is provided a compressor comprising a shell having a compression cylinder positioned therein, the compressor protruding from the shell an inlet tube from the evaporator and a discharge tube leading the fluid into the condenser; At least one precondenser connected to the compressor, supplied by a pipe from a compression cylinder positioned in the compressor, and having an outlet tube; And a heat exchanger located internally to the outer region of the compressor and interacting with the precondenser through the outlet tube of the precondenser. By using a precondenser, the above-mentioned objects are achieved through a compressor cooling system.

According to a preferred embodiment of the present invention, the external heat exchanger comprises tubes tightened around the compressor or microcompressor shell.

Optionally, the presented system can operate continuously with an additional internal heat exchanger which interacts with the precondenser via a spring tube located in the compressor and connected to the end of the outlet tube of the precondenser, the internal heat exchanger being located in the shell and Close to the hot part of the compressor, when available, preferably close to the compression cylinder or compression cylinder cap, the internal heat exchanger being externally connected via a spring tube connected to the end of the precondenser or outlet tube of the precondenser. The fluid is received from the heat exchanger and the fluid treated therein is led through the output spring tube into the discharge tube.

The present invention consists of a shell having a compression cylinder located therein, the compressor or micro-compressor protrudes from the shell the inlet tube from the evaporator and the discharge tube to guide the fluid into the condenser; At least one precondenser connected to the compressor, supplied by a pipe from a compression cylinder positioned in the compressor, and having an outlet tube; And a heat exchanger located internally with respect to the outer region of the compressor and interacting with the precondenser via an outlet tube of the precondenser.

In a possible embodiment of the invention, the compressor equipped with the cooling system may further comprise at least one internal heat exchanger which interacts with the precondenser via a spring tube located in the compressor and connected to the end of the outlet tube of the precondenser. have.

Thus, the above objects are achieved by a compressor cooling system comprising means for reducing the temperature of the heat sources of the compressor equipment and thus reducing the initial compression temperature and improving the efficiency in compression.

1 shows a schematic perspective view of a diagram illustrating a compressor interacting with a precondenser and an external heat exchanger constructed in accordance with a preferred embodiment of the present invention.
FIG. 2 shows a diagram schematically showing a cooling system constructed in accordance with the preferred embodiment of the invention shown in FIG. 1.
3 shows a front view of a heat exchanger connected with a compressor constructed according to a preferred embodiment of the invention.
4 shows a top view of the equipment shown in FIG. 3.
FIG. 5 shows a front view with a partial longitudinal section of an alternative embodiment of a compressor provided from a cooling system, further mounted with an internal heat exchanger coupled to the compressor cylinder cap.
FIG. 6 shows a partial cross-sectional schematic view of FIG. 5 showing a second possible embodiment for the present invention in which an internal heat exchanger is coupled to the compressor cylinder.

The invention will be explained in more detail below on the basis of the implementation embodiment shown in the accompanying drawings.

As shown in FIG. 1, a compressor cooling system using a pre-condenser and a heat exchanger, which is an object of the present invention, includes: a compressor 1 connected to a pre-condenser 7, and a compressor 1. It consists of a heat exchanger 91 located in a shell 2 and interacting with a free condenser 7.

FIG. 5 shows the shell 2 with the compressor 1 protruding from the evaporator (not shown) and the inlet tube 5 and the outlet tube 6 leading the already compressed and treated fluid into the condenser (not shown). From-except in the case of using a microcompressor, which does not present an inner cap-a compression cylinder 3 and each cap 4 of which consists of a localized shell 2 The compressor 1 is further equipped with a tubing (or tubes) 8 of interconnection with the precondenser 7 interacting with it, the precondenser 7 being more than from FIGS. 5 and 6. As can be noted, the details of the feeding by the pipe 8 from the compression cylinder 3 located in the compressor 1 are explained in detail.

In accordance with a preferred embodiment of the invention shown in FIGS. 1 and 2, the heat exchanger 91 consists of pipes arranged around the shell of the compressor or microcompressor 1, while coating in whole or in part.

According to this arrangement, the precondenser 7 acts at the same condenser temperature as the cooling system, so that the compressor 1 coated by the heat exchanger 91 is arranged in pipes 91 arranged around the compressor 1. Due to the evaporative heat exchange that takes place, it is guaranteed that it will have a low temperature close to the condensation temperature.

Note that both the compressor cooling system and the compressor itself with the cooling system may include an additional heat exchanger 9 located within the compressor 1, while operating in series with the heat exchanger 91 and the precondenser 7. It is worth it.

Said further internal heat exchanger 9 should preferably be located in a shell 2 proximate the hot part of the compressor 1, with the internal heat exchanger 1 terminating at the outlet tube 11 of the precondenser 7. The fluid is received from the pre-condenser 7 via a spring tube 10 connected to it and guides the fluid processed therein through the output spring tube 12 into the discharge tube 6.

5 shows a first configurable example for the further internal heat exchanger 9, whereby it is coupled to the compression cylinder 3 of the compressor 1 and acts identically.

Another embodiment of the invention is shown in FIG. 6, in which an additional internal heat exchanger 9 is coupled to the cap 4 of the compression cylinder 3 when available (noting that the microcompressor does not present an inner cap). do.

The system of the present invention uses the gas itself that is compressed and pumped by the compressor 1 to transfer heat from inside the compressor 1 to the external environment. In general, the gas used is condenser (not shown) along the path in the compressor 1 through the cap 4 of the compression cylinder 3, the exhaust filter, the exhaust pipe and eventually the exhaust tube 6.

Upon exiting the compressor 1, the compressed gas dissipates heat to the external environment through the precondenser 7, where the coolant leads to the saturation region. At the end of the free condenser 7 the coolant temperature-now considered two phases-is the self-condensing temperature of the cooling system. Upon exiting the heat exchanger 7 with a lower energy level (enthalpy), the coolant returns to the compressor 1 and draws the pipes 91 along all the outer surfaces of the shell 2 of the compressor 1. Guided through. The two phase coolant then exchanges the sensitive and latent heat with the heated body of the compressor, reducing its temperature. After attaining the heat exchange, this fluid is then directed to the discharge tube 6 which constitutes the interface of the compressor 1 with the other components of the cooling system.

It is worth stressing that the heat exchanger 91 has the function of removing heat from the hot parts of the compressor 1 and thus reducing the loss by overheating the gas in the compression and suction paths. Its use also aims at interconnecting the condensation temperature with the shell temperature of the compressor 1 and subsequently preventing the compressor 1 from collapsing when operating at high room temperature.

Moreover, the precondenser 7 allows to maintain the surface temperature of the compressor quite close to the system concentration temperature, which is difficult to achieve immediately by ventilation.

In the case where the presented system uses an additional internal heat exchanger 9, embodiments of the components that can be cooled include a compression cylinder 3 and a cap 4 of the compression cylinder 3.

When the component to be cooled is the compression cylinder 3, as shown in FIG. 6, the compressed fluid exits the compressor 1 through the conduit 8 and heats in the precondenser or external heat exchanger 7. And return to the compressor (1) through the outlet tube (11) of the precondenser (7). Upon entering the compressor 1 again, the cooled fluid is led through a spring tube 10 into an internal heat exchanger 9 coupled to the compression cylinder 3. Upon exiting the internal heat exchanger 9, the fluid is sent through the other spring tube 12 into the discharge tube 6-this is the interface through which the compressed fluid is delivered to the condenser or cooling system.

Heat exchanged in the compression cylinder 3 reduces the wall temperature of the cylinder 3 and further the fluid temperature of the suction chamber S; Thus, in addition to the coolant fluid entering the cooler cylinder 3, heating is reduced therein, and heat exchange to the walls during compression is maximized, providing a compression process with higher thermodynamic efficiency.

Alternatively, as shown in FIG. 5, the internal heat exchanger 9 may be coupled to the cap 4 (when available) of the compression cylinder 3. In this configuration, the compressed fluid exits the compressor 1 through the supply pipe (pipe) 8 of the precondenser 7, discards heat from the precondenser 7, and the compressor through the tube 11. Return to (1). Upon reentering the compressor 1, the cooled fluid is led through the spring tube 10 into the internal heat exchanger 9, which is coupled to the cap 4 of the compression cylinder 3. Similar to what has occurred in the previously provided embodiment, upon exiting the internal heat exchanger 9, the fluid is oriented through the other spring tube 12 into the discharge tube 6 leading the compressed fluid into the condenser of the cooling system. .

The heat exchanged in the cap 4 of the cylinder 3 reduces the temperature of the compressed gas inside and in all parts of the head. Since the compressed gas is the main heat source of the compressor 1, reducing its temperature causes a decrease in the overall temperature of the compressor 1 component. Thus, there is a reduction in the initial compression temperature, which results in higher thermodynamic efficiency in the compression process.

The advantage of using a compressor cooling system using the precondenser 7, which is the object of the present invention, relates to aspects of reliability and energy efficiency. In terms of reliability, cooling of the hot portion of the compressor 1 caused by the proposed system avoids the critical temperature at which the existing oil in the compressor 1 may undergo irreversible change and relief in its thermodynamic properties.

However, the greatest advantage is related to the increased energy efficiency of the compressor 1. By transferring heat from the hot portion of the compressor 1 to the external environment, this results in increased density of the coolant at the start of the compression process, thereby increasing the mass compressed and pumped by the compressor 1 in the suction path. There is a reduction in gas overheating. Therefore, there is an increase in the coefficient of performance (COP) of the compressor (1).

The proposed solution also creates an advantage for the operation of the cooling system as a whole. By adding the pre-condenser 7 there is a higher heat exchange with the external environment, causing a lower temperature coolant to circulate through the discharge tube 6. Thus, with the coolant delivered to the cooling system at lower temperatures, the condenser is too large, causing a decrease in the condensation system pressure.

Thus, the efficiency of the cooling cycle is increased because it reduces the temperature difference required for heat exchange. In addition, because the condenser becomes too large, there is also a reduction in pull down peak pressure, which equally most likely for the compressor 1, where rotation due to excessive temperature and discharge is likely to occur. It is a critical situation.

Although the preferred method of construction of the invention is shown, it is understood that any omissions, substitutions, and structural changes may be made by one of ordinary skill in the art without departing from the spirit and scope of the claimed protection. It is worth mentioning that. It is also clearly provided 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. It is also intended and contemplated to substitute elements of the described embodiments with other elements.

However, it is to be understood that the description provided based on the drawings above relates to only some of the possible embodiments for the system of the present invention, and the actual scope of the object of the present invention is defined by the appended claims.

Claims (8)

Compressor (1) consisting of a shell (2) in which a compression cylinder (3) is located, projecting from the shell (2) an inlet tube (5) from the evaporator and a discharge tube (6) to guide the fluid into the condenser ;
At least one precondenser (7) connected to the compressor (1) and supplied by a pipe (8) from a compression cylinder (3) located in the compressor (1), and equipped with an outlet tube (11); And
Compressor cooling system, characterized in that it comprises a heat exchanger (91) located inside the outer region of the compressor (1) and interacts with the precondenser (7) through the outlet tube (11) of the precondenser (7).
The method of claim 1,
Compressor cooling system, characterized in that the heat exchanger (91) comprises tubes attached around the shell (2) of the compressor (1).
The method of claim 1,
The precondenser 7 and the heat exchanger 91 interact with at least one further internal heat exchanger 9 located in the compressor 1, the internal heat exchanger 9 being the outlet tube of the precondenser 7. Compressor cooling system, characterized in that it interacts with the free condenser (7) through a spring tube (10) attached to the end of 11).
The method of claim 3, wherein
An additional internal heat exchanger 9 is located in the shell 2 and with the hot part of the compressor 1, and an additional internal heat exchanger 9 is attached to the end of the outlet tube 11 of the precondenser 7. Compressor cooling system, characterized in that it receives fluid from the pre-condenser (7) via a spring tube (10), and guides the fluid processed therein through the outlet spring tube (12) into the discharge tube (6).
The method according to any one of claims 3 and 4,
Compressor cooling system, characterized in that an additional internal heat exchanger (9) is coupled to the compression cylinder (3).
The method according to any one of claims 3, 4 and 5,
Compressor cooling system, characterized in that an additional internal heat exchanger (9) is coupled to the cap (4) of the compression cylinder (3), when available.
In the compressor provided from the cooling system,
Compressor or microcompressor, consisting of a shell (2) in which a compression cylinder (3) is located, projecting from the shell (2) an inlet tube (5) from the evaporator and a discharge tube (6) to guide the fluid into the condenser. (One);
At least one precondenser (7) connected to the compressor (1) and supplied by a pipe (8) from a compression cylinder (3) located in the compressor (1), and equipped with an outlet tube (11); And
And a heat exchanger (91) located inside the outer region of the compressor (1) and interacting with the precondenser (7) via an outlet tube (11) of the precondenser (7).
The method of claim 1,
The compressor comprises at least one additional internal heat exchanger (9) located in the compressor (1), the internal heat exchanger comprising a spring tube (10) attached to the end of the outlet tube (11) of the precondenser (7). Compressor, characterized in that the interaction with the pre-condenser (7) through.

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