KR200305376Y1 - Chiller using Fin Tube - Google Patents

Abstract

The present invention relates to a chiller, and more particularly to a chiller using a fin tube that can minimize the size while significantly increasing the heat transfer area by using a fin tube formed with an outer fin and an inner fin as a heat pipe used for the chiller. . To this end, a plurality of outer fins are formed on the outside of the tube and a plurality of inner fin fins formed inside the tube; And a casing provided with a casing inlet and a casing outlet through which the fin tube is disposed and the water passes therein.

Description

Chiller using Fin Tube

The present invention relates to a chiller for cooling a fluid such as air and water, and is a heat pipe used for a chiller. Fins are formed on the inside and outside of the tube to minimize the size of the chiller while greatly increasing the heat transfer area. It relates to a chiller using a tube.

Chiller is a component that performs cooling by heat exchange, and varies in size from small to large and is widely used in our daily life. Small chillers are suitable for domestic water purifiers for making cold water, and large chillers are suitable for installation in a central air conditioner freezer installed in the basement of a large building. In this case, the central air conditioner cools the water and the cooled water is supplied to an air-cooled heat exchanger called an air handling unit installed in various places in the building to lower the temperature of the indoor air by heat exchange with indoor air. The chiller is also necessary for constant temperature and humidity.

In the refrigerating cycle, when the high pressure liquid refrigerant passing through the freezer compressor and condenser passes through the pressure drop valve, the pressure decreases, a part of the liquid refrigerant evaporates and the temperature decreases due to the heat of vaporization. The gas-liquid mixed refrigerant flows into the chiller and absorbs the heat of vaporization from the water that is required for the refrigerant to evaporate completely. From the standpoint of the chiller, the chiller is an evaporator. The purpose of using a freezer is to cool the water, so from that point of view it is a water cooler, or chiller.

Currently used chillers vary in shape depending on their size. 6 of these conventional chillers is a perspective view showing a conventional shell-and-tube-shaped chiller. As shown in FIG. 6, the chiller of a large freezer is very large in size and uses a general heat exchanger 60 called a shell and tube, in which a tube 62 is placed inside the cylindrical casing 61. As shown in FIG. This structure is inserted. In order to quickly exchange a large amount of heat, a lot of pipes 62 were installed, but there was a problem in that the size of the chiller was large because the receiving space of the fluid to be cooled inside the casing 61 was small.

Small chillers may use a double tube (not shown) made by inserting a small diameter tube into a large diameter tube. The refrigerant flows inside the small tube and evaporates, while the water cools down between the small and large tubes. Although it has excellent heat exchange performance, it is generally used only in a small refrigerator because it is difficult to manufacture a double tube and also has a low flow rate of water to be cooled.

In addition, a plate heat exchanger (not shown) may be used for the chiller. The plate heat exchanger is a heat exchanger made of a plurality of thin metal plates, and water flows on one side of the plate and a refrigerant flows on the other side to evaporate. In this case, the refrigerant and water generally flow in the opposite direction. The plate heat exchanger also has excellent heat exchange performance, but the chiller has a problem in that the size of the chiller is increased in order to cool a large amount of water because the flow rate of the water to be cooled is small.

7 is a perspective view showing a conventional pin core chiller. As shown in FIG. 7, the pin core used for the pin core chiller 65 is formed by inserting a tube 66 after forming a hole in a plate 67 made of thin aluminum or copper. It is difficult to make a perfect contact between the 67 and the tube 66, in order to overcome this by forcibly pushing the ball into the inside of the tube 66 to expand the tube, in this case to form an internal pin inside the tube 66 It becomes impossible. Therefore, the heat transfer area is limited only to the outside of the plate 67 and the tube 66, the heat exchange performance is limited.

The present invention is devised to solve the above problems, the object of the present invention is to use the size of the chiller by using a fin tube formed with an outer fin and an inner fin on the outside and inside of the tube to increase the heat transfer area It is to provide a chiller using a fin tube with excellent heat exchange ability while minimizing.

An object of the present invention is a plurality of outer fins are formed on the outer surface of the tube and a plurality of inner fins are formed in the inner tube and a plurality of fin tubes flowing refrigerant therein; And a casing provided with an inlet and an outlet through which the fin tube is disposed and through which the antifreeze passes.

In addition, in order to achieve the above object, the outer pin is preferably formed in a radial circle in the center axis of the tube.

In addition, in order to achieve the above object, the inner pin is preferably formed extending from the central axis of the tube to the inner diameter surface of the tube.

In addition, in order to achieve the above object, it is preferable that a partition is formed in a direction in which the antifreeze passes on one side of the casing to partition a predetermined portion inside the casing.

In addition, in order to achieve the above object, the pin tube is preferably arranged such that the central axis is perpendicular to the direction in which the antifreeze of the casing flows.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

1 is a perspective view schematically showing a chiller using a fin tube according to a first embodiment of the present invention;

2 is a view showing a refrigeration cycle of the ice storage air conditioner is applied chiller using a fin tube according to the first embodiment of the present invention,

3 is an enlarged perspective view of the fin tube shown in FIG. 1;

4 is a cross-sectional view schematically showing a casing of a chiller using a fin tube according to a second embodiment of the present invention;

5 is a cross-sectional view schematically showing a casing of a chiller using a fin tube according to a third embodiment of the present invention;

6 is a perspective view of a conventional shell-and-tube chiller,

7 is a perspective view showing a conventional pin core chiller.

Explanation of the Main References

1,70,80: casing 2: fin tube

4: external pin 5: internal pin

8; Casing entrance 9: Casing exit

30: compressor 31: condenser

32: Pressure Reducing Valve 33: Evaporator / Chiller

34: ice machine 35: indoor unit

25: refrigerant 45: antifreeze

Hereinafter, with reference to the accompanying drawings will be described the configuration of the chiller using a pin tube according to an embodiment of the present invention.

Since the chiller using the fin tube according to the present invention is to be used in a refrigeration cycle, the refrigeration cycle including the chiller will be described schematically to show the role of the chiller in the refrigeration cycle.

2 is a view showing a refrigeration cycle of the ice heat storage air conditioner to which the chiller is applied using the fin tube according to the first embodiment of the present invention. As shown in FIG. 2, the chiller according to the first embodiment of the present invention may be used in an ice storage air conditioner, and the ice storage air conditioner is approximately a compressor 30, a condenser 31, an evaporator / chiller 33, and ice. It consists of an accumulator 34 and an indoor unit 35.

Hereinafter, the first net environmental path 40 and the second net environmental path 39 constituting the ice cycle of the ice heat storage air conditioner will be described.

The first pure environment path 40 is a refrigerant circulates through the compressor 30, the condenser 31, the pressure reducing valve 32 and the evaporator 33.

First, the refrigerant in an evaporated state is introduced into the compressor 30 and compressed at high pressure. Then, the high-pressure gas refrigerant introduced into the condenser 31 condenses by releasing heat from the condenser 31 to the outside. The condensed high-pressure refrigerant passes through the pressure reducing valve 32, and a portion of the refrigerant is vaporized and then flows into the evaporator 33. Most of the refrigerant is vaporized by absorbing heat from the outside in the evaporator 33. The vaporized refrigerant flows back into the compressor 30 and the cycle of the first net environmental path 40 is repeated.

The second circulating path 39 may be a brine in which the circulating fluid is an antifreeze or an aqueous solution of CaCl ₂ or NaCl having a low freezing point. Thus, the antifreeze circulates through the chiller 33 (equivalent to the " evaporator " in the first net environment), the circulation pump 36 and the ice accumulator 34. At this time, the first switch valve 37 for opening and closing the second net environmental path 39 is open, and the second switch valve 38 for opening and closing the third net environmental path 41 is closed.

The chiller 33 is a device included in both the first pure environmental furnace 40 and the second pure environmental furnace 39, and the antifreeze flowing into the chiller 33 directs vaporization heat toward the refrigerant circulating in the first pure environmental furnace 40. The cooled and low temperature antifreeze flows into the ice accumulator 34 by the circulation pump 36 and heat exchanges with water that is hotter than the antifreeze stored in the ice accumulator 34. As the antifreeze flows into the chiller 33, the cycle of the second net environmental path 39 is completed. As the cycle of the second pure environment path 39 is repeated, the water supplying heat to the antifreeze is frozen.

As such, the ice storage type air conditioner operates the third pure environment furnace 41 by using the ice generated in the ice accumulator 34 by the operation of the first pure environment furnace 40 and the second pure environment furnace 39 to cool the air. Let's do it.

1 is a perspective view schematically showing a chiller using a fin tube according to a first embodiment of the present invention. As shown in FIG. 1, a chiller using a fin tube according to a first embodiment of the present invention has a rectangular box-shaped casing (1), and a fin having fins formed on the outside and inside of the tube in the casing (1). A tube 2, an inlet manifold 10 which is a passage through which refrigerant flows into and out of the fin tube 2, a U manifold 20 which connects the discharge manifold 15 and the fin tubes 2 to each other. It is composed.

The box-shaped casing 1 has a casing inlet 8 and a casing outlet 9 so that the four sides are closed and the remaining two sides are open to allow the antifreeze 45 to pass through the casing 1. . Two opposing surfaces located in the axial direction of the fin tube 2 among the four closed surfaces of the casing 1 are composed of a U-tube guide surface 21 in which a plurality of through holes 22 are formed.

20 to 30 fin tubes 2 are installed in the casing 1 in a direction perpendicular to the flow path of the antifreeze 45, and the fin tubes 2 are minimized to minimize the distance between the rows of adjacent fin tubes 2. ) Are staggered each row. Both ends of the built-in fin tube 2 penetrate through the through-hole 22 of the U-shaped tube guide surface 21 located in the axial direction of the fin tube 2, and are exposed to the outside.

The U-shaped tube 20 is a tube bent in a U-shape at both ends, and is coupled to an end of the fin tube 2 at the outside of the U-shaped tube guide surface 21 so as to mutually connect the fin tubes 2, which are flow paths of the refrigerant 25. do.

Of the fin tubes (2) installed in the casing (1), the heat of the fin tube (2) closest to the casing inlet (8) and the casing outlet (9) is connected to the inlet manifold (10) and the outlet manifold (15). It is. The inlet manifold 10 is a passage through which the refrigerant 25 passing through the condenser enters the chiller, and one inlet manifold inlet 12 is formed at one side of the cylindrical body standing vertically, and the casing outlet 9 at the other side. Four inlet manifold outlets 11 are formed which engage with the rows of the side fin tubes 2.

The discharge manifold 15 is identical to the inlet manifold 10 and is provided with four discharge manifold inlets 16 and one discharge manifold outlet 17.

3 is an enlarged perspective view of the fin tube shown in FIG. 1. As shown in Figures 1 and 3, the fin tube (2) inherent in the casing (1) has a circular outer fin (4) thinner than the height is 6 to 11 on the outer diameter surface of the tube (3) Five internal fins 5 are formed in the tube 3 from the central axis of the tube 3 to the inner diameter surface 6 of the tube 3. The outer fins 4 are formed in 6 to 10 pieces per length of 25.4 mm (1 inch) of the fin tube 2, and the height of the outer fins 4 is 6 mm to 15 mm.

4 is a cross-sectional view schematically showing a casing of a chiller using a fin tube according to a second embodiment of the present invention. As shown in FIG. 4, the chiller using the fin tube according to the second embodiment of the present invention is similar to the chiller using the fin tube according to the first embodiment, but the structure of the casing is modified.

The casing 70 of the chiller according to the second embodiment of the present invention is a box shape in which five faces are closed and only one face is opened, and the casing 70 is partitioned from the casing inlet 71 to just before the opposing face. 75 is extended so that the inner space of the casing 70 is divided into two, and the two spaces communicate with each other. One side of the casing 70, the upper portion of the partition 75 is a casing inlet 71 through which antifreeze flows, and the lower portion of the partition 75 is a casing outlet 72 through which the antifreeze 45 is discharged. Therefore, the casing inlet 71 and the casing outlet 72 are formed in the same direction.

5 is a cross-sectional view schematically showing a casing of a chiller using a fin tube according to a third embodiment of the present invention. As shown in FIG. 5, the chiller using the fin tube according to the third embodiment of the present invention is similar to the chiller using the fin tube according to the second embodiment of the present invention, but the structure of the casing is modified. will be.

In the chiller according to the third embodiment of the present invention, two partitions 81 and 82 are installed in the casing 80. The box-shaped casing 80 has four surfaces closed and only two portions thereof open to form a casing inlet 83 and a casing outlet 84.

The casing inlet 83 is provided at the upper right side of the surface of the casing 80 positioned in the direction in which the antifreeze 45 flows, and from the lower end of the casing inlet 83 to face the casing inlet 83. The first partition 81 is formed until just before the surface, and the first partition 81 forms the first passage 85 extending from the casing inlet 83 to the inside of the casing 80.

A second partition 82 is provided below the first partition 81, and the second partition 82 is formed from the opposite surface of the casing inlet 83 to just before the casing inlet 83 side. The second partition 82 forms a second passage 86 and a third passage 87 in communication with the first passage 85, and at the end of the third passage 87 as a lower portion of the second partition 82. A casing outlet 84 is opened to the outside of the casing 80.

Hereinafter, the operation of the chiller using the fin tube according to the first embodiment of the present invention.

As shown in FIGS. 1 and 2, the process of introducing and discharging the refrigerant 25, which is R-22, from the condenser 31 to the chiller 33 is performed by the refrigerant 25 introduced into the inlet manifold inlet 12. ) Is introduced into the fin tube (2) connected to the inlet manifold outlet (11) via the inlet manifold outlet (11) and discharge manifold inlet (16) through all of the pin tubes (2) interconnected to the U-tube (20). Through the discharge manifold outlet 17 is circulated back to the compressor (30).

While the refrigerant 25 passes through the fin tube 2 in the chiller 33, the liquid refrigerant 25 flowing inside the fin tube 2 is vaporized, and the required heat of vaporization is chiller 33. The antifreeze 45 introduced into the casing 1 through the casing inlet 8 of the casing 1 is supplied through the fin tube 2, and the cooled antifreeze 45 is supplied to the casing outlet 9 after supplying heat. Through it is discharged to the outside of the chiller.

In the heat exchange process, the inner fins 5 and the outer fins 4 formed on the fin tube 2 increase the heat transfer area between the refrigerant 25 and the antifreeze 45 to improve the efficiency of heat transfer, thereby reducing the size of the chiller. Becomes smaller.

Hereinafter, the operation of the chiller using the fin tube according to the second embodiment of the present invention will be described.

As shown in FIG. 4, the chiller using the fin tube according to the second embodiment of the present invention has a similar configuration to that of the chiller according to the first embodiment, but one partition 75 is provided inside the casing 70. There is a difference in that the inner space of the casing 70 is divided into two.

The antifreeze 45 introduced from the casing inlet 71 passes through the fin tube 2 installed in the first passage 76 at the upper part of the partition 75, and then exchanges with the refrigerant, and then flows into the second passage 77. After the heat exchange again with the fin tubes (2) installed in the second passage (77) is discharged to the outside of the chiller through the casing outlet (72). As a result, the antifreeze 45 crosses the inside of the casing 70 twice and undergoes heat exchange.

In the process where the refrigerant exchanges heat with the antifreeze 45 through the fin tube 2 and vaporizes, the flow rate of the refrigerant is 302 kg / h, evaporates at -7 ° C, and is supersaturated at 5 ° C. The flow rate of the antifreeze is 1800 ㎏ / h and enters -0.5 ℃ and cooled to -2.5 ℃, the -2.5 ℃ antifreeze flows to the ice pack (not shown) to make ice and to -0.5 ℃ to return to the chiller.

Accordingly, even when the flow rate of the antifreeze 45 passing through the casing 70 is small, all of the fin tubes 2 installed in the casing 70 can pass therethrough. The efficiency can be increased.

Hereinafter, a method of operating a chiller using a fin tube according to a third embodiment of the present invention will be described.

As shown in FIG. 5, the chiller using the fin tube according to the third embodiment of the present invention uses the same principle as the chiller according to the second embodiment, and the number of the partitions 81 and 82 is two. There is a difference.

An antifreeze 45 flowing into the chiller passes through the first passage 85, the second passage 86, and the third passage 87 formed by the two partitions 81 and 82, respectively. Since the heat exchange with the (2), even if the flow rate of the antifreeze 45 is small, the heat exchange with all the fin tube (2) is high efficiency of heat exchange.

In the preferred embodiment of the present invention, the antifreeze is exemplified as the fluid passing through the casing of the chiller, but the present invention is not limited thereto, and may be applied to any fluid such as water and air.

In the preferred embodiment of the present invention, the number of partitions installed in the casing is one or two, but the present invention is not limited thereto, and three or more partitions may be formed.

In a preferred embodiment of the present invention, the form of the casing is box-shaped, but the present invention is not limited to this, it is also possible to use a cylindrical casing.

According to the chiller using a fin tube according to an embodiment of the present invention having the above-described configuration, since the fin tube having the outer fin and the inner fin is formed as a heat exchange means constituting the chiller, the heat transfer area is greatly increased, and thus the heat exchange capacity is increased. An excellent yet compact chiller can be provided.

In addition, the chiller according to the present invention has a large heat transfer area, but can reduce the number of fin tubes installed in the chiller, so that the inner space of the chiller is relatively large to accommodate a large amount of water, thus cooling a large amount of water. Can be.

The chiller according to the present invention can be used in home air conditioners because it can be miniaturized while maintaining the cooling capacity, and can also be used in a central cooling device requiring a large capacity of cooling.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Therefore, the scope of the utility model registration claims attached will include such modifications or variations that fall within the spirit of the present invention.

Claims (5)

A plurality of outer fins (4) is formed on the outer surface of the tube (3), a plurality of inner fins (5) are formed inside the tube (3) and the plurality of fin tubes (2) flowing the refrigerant 25 therein ; And The fin tube is characterized in that it comprises a casing (1) having a casing inlet (8) and casing outlet (9) so that the pin tube (2) is disposed therein and the antifreeze (45) can pass through Used chiller. The chiller according to claim 1, wherein the outer fin (4) is formed in a radial circle on an outer surface of the tube (3). The chiller according to claim 2, wherein the inner pin (5) extends from the central axis of the tube (3) to the inner diameter surface (6) of the tube (3). The partitions (75, 81) according to any one of claims 1 to 3, in order to partition the interior of the casing (1) in a direction in which the antifreeze (45) passes through one side of the casing (1). A chiller using a fin tube, characterized in that 82) is further formed. 2. The chiller according to claim 1, wherein the center axis of the fin tube (2) is arranged so as to be perpendicular to the direction in which the antifreeze (45) flows inside the casing (1).