KR101553391B1 - Heat exchanger for heat transferefficiency improvement and anti-freezing - Google Patents

Abstract

The present invention relates to a heat exchanger with improved heat exchange efficiency and an anti-freezing function and, more specifically, relates to a heat exchanger to prevent lowering of a heat exchange efficiency and damages due to freezing by preventing ice from being formed around a heat exchange tube due to over-cooling. The heat exchanger with improved heat exchange efficiency and an anti-freezing function comprises: a cooling tank wherein a target fluid to be cooled stays; a heat exchange tube in which a heat exchange medium flows wherein the heat exchange tube is installed in the cooling tank to cool the target fluid by contacting the target fluid; and an ice preventing unit to prevent ice from being formed on an outer circumference of the heat exchange tube due to over-cooling of the heat exchange tube.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heat exchanger for heat exchange efficiency improvement and anti-freezing,

The present invention relates to a heat exchanger having a function of improving heat exchange efficiency and preventing freezing. More particularly, the present invention relates to a heat exchanger capable of preventing the generation of ice around the heat exchanging tube by the supercooling, Heat exchanger.

Generally, a heat exchanger corresponds to a device for exchanging heat energy between different fluids. The heat exchanger may be referred to as a heater, a cooler, or the like depending on the purpose of use.

The role of a heat exchanger in an air conditioning system using refrigerant is very important. In other words, it is very important to serve as a heat exchanger (condenser) for heat-exchanging the refrigerant gas compressed at a high temperature and a high pressure in the compressor with water or a heat exchanger (heat exchanger) for exchanging heat with the expanded low-

Generally, a tubular multistage heat exchanger is widely used for industrial process because it can be manufactured variously according to the choice of conditions such as temperature, pressure and fluid, and the required heat exchange capacity.

In the case of an evaporator that cools water, if the evaporation pressure of the internal refrigerant decreases during operation, if the operation is continued below the freezing point of the water, ice is formed on the surface of the heat exchange tube to lower the heat exchange performance. The heat exchange tubes are pushed and damaged to each other, and as a result, the cooling system becomes incapable of operating, resulting in equipment loss and an entire process.

Therefore, it is necessary to suppress the formation of ice on the surface of the heat exchange tube in order to prevent the heat exchanger from being frozen.

Korean Patent Laid-Open No. 10-2011-0122534 discloses a heat exchanger for carbon dioxide refrigerant in which heat exchange efficiency is maximized.

The heat exchanger is a heat exchanger using carbon dioxide as a refrigerant. The heat exchanger includes a body having a tubular shape and a water inflow hole and a water outflow hole formed to be spaced apart from each other on a side of the tubular shape; A plate-shaped first diaphragm member disposed at one end of the body and having a plurality of refrigerant passage holes; A plate-shaped second diaphragm member disposed on the other end of the body and having a plurality of refrigerant passage holes; A plurality of refrigerant tubes arranged to connect between the first diaphragm member and the second diaphragm member and coupled to the refrigerant passage holes; A first cover member coupled to one end of the body and having a coolant inflow hole into which coolant flows; And a second cover member coupled to the other end of the body and having a refrigerant outflow hole through which the refrigerant flows, wherein the refrigerant introduced into the refrigerant inflow hole is disposed between the refrigerant inflow hole and the first partition member, And a uniformly distributed turbo nozzle for distributing the air into the first diaphragm member.

The heat exchanger is configured such that the heat of the refrigerant flowing through the refrigerant pipe is rapidly transmitted to the surface of the refrigerant pipe by the plurality of sub-tubes arranged so as to be in contact with each other inside the refrigerant tube, The heat exchange efficiency is remarkably improved by maximizing the heat exchange efficiency with the water flowing outside the refrigerant tube. However, when the refrigerant tube is overcooled, water around the refrigerant tube is frozen, There is a problem that ice is formed on the outer peripheral surface of the pipe. The ice formed on the outer circumferential surface of the refrigerant tube not only significantly reduces the heat exchange efficiency between the refrigerant tube and the water but also causes the heat wave to be generated in the heat exchanger when the formation of ice is continued.

Korean Patent Publication No. 10-2011-0122534: Heat exchanger for carbon dioxide refrigerant with maximized heat exchange efficiency

The present invention has been made to overcome the above-mentioned problems, and it is an object of the present invention to provide a heat exchanger which can prevent the generation of ice on the outer circumferential surface of a heat exchange tube by applying a vibration to the circumference of a heat exchange tube, And to provide a heat exchanger capable of preventing the above-mentioned problems.

In order to accomplish the above object, the present invention provides a heat exchanger having a heat exchange efficiency improvement and a frost prevention function, comprising: a cooling tank in which a fluid to be cooled stays; A heat exchange tube installed in the cooling bath to contact the object fluid to cool the object fluid and having a heat exchange medium flowing therein; And ice preventing means for preventing ice from being formed on an outer circumferential surface of the heat exchange tube due to a supercooling degree of the heat exchange tube.

And the ice prevention means includes a vibration generating unit that applies vibration to the heat exchange tube or the target fluid.

The vibration generating unit may include a body coupled to the cooling vessel in a detachable manner, a vibrator installed on the body for vibrating the inside of the cooling vessel, and an ultrasonic generator connected to the vibrator to vibrate the vibrator .

The vibration generating unit may include a body coupled to the cooling tank in a detachable manner, a vibration medium installed inside the body and in contact with the heat exchange tube, a vibrator installed on the vibration medium to apply vibration, And an ultrasonic generator for vibrating the vibrator.

Wherein the vibrating medium includes a ring portion formed with an insertion hole through which the heat exchange tube passes, a mounting portion formed on an outer side of the ring portion and on which the vibrator is mounted, and a mounting portion for preventing the mounting portion from interfering with the flow of the object fluid And a plurality of cut-out portions formed.

And the body is provided as a pair of first and second members installed on the outside of the cooling bath.

Wherein the vibration generating unit includes a vibration medium provided inside the cooling bath and in contact with the heat exchange tube, a vibrator provided on the vibration medium to apply vibration, and an ultrasonic generator connected to the vibrator to vibrate the vibrator .

As described above, according to the present invention, it is possible to prevent ice from being generated on the outer circumferential surface of the heat exchange tube by applying a vibration to the circumference of the heat exchange tube through which the heat exchange medium flows. In addition, ice formed on the outer circumferential surface of the heat exchange tube can be effectively removed.

Accordingly, the heat exchange efficiency between the heat exchange medium and the target fluid can be prevented from being lowered, and damage due to the freezing of the heat exchanger can be prevented.

1 is a schematic side view of a heat exchanger according to an embodiment of the present invention,
FIG. 2 is an exploded perspective view showing the inside of the heat exchanger cut along the line A-A 'in FIG. 1,
Fig. 3 is a sectional view of Fig. 2 taken from the front,
4 is a schematic side view of a heat exchanger according to another embodiment of the present invention,
FIG. 5 is an exploded perspective view showing the inside of the heat exchanger cut along the line B-B 'in FIG. 4,
Fig. 6 is a cross-sectional view of Fig. 5 taken from the front,
7 is a schematic side view of a heat exchanger according to another embodiment of the present invention,
8 is a cutaway perspective view showing the inside of the heat exchanger cut along the line C-C 'in FIG. 7,
Fig. 9 is a sectional view of Fig. 8 taken from the front,
10 is a cross-sectional view showing the inside of a heat exchanger according to another embodiment of the present invention,
11 is a cutaway perspective view showing the inside of the heat exchanger of FIG. 10,
12 is an exploded perspective view showing a main part of a heat exchanger according to another embodiment of the present invention,
FIG. 13 is a schematic view showing a configuration of the main portion of the heat exchanger applied to FIG. 1; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a heat exchanger having a heat exchange efficiency improvement and a freeze prevention function according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIGS. 1 to 3 and 13, the heat exchanger of the present invention includes a cooling tank 10 in which a target fluid to be cooled stays, a cooling tank 10 ) Includes a heat exchange tube 20 and ice preventing means for preventing ice from being formed on the outer circumferential surface of the heat exchange tube 20 due to a supercooling degree of the heat exchange tube 20.

In the cooling bath (10), the target fluid to be cooled flows in and out. Here, the target fluid means a fluid to be cooled by the heat exchange medium. For example, the subject fluid includes a liquid such as water, a gas such as air, and the like.

The cooling tank 10 includes a cylindrical housing 11, an inlet pipe 13 formed at one side of the housing 11 and an outlet pipe 15 formed at the other side of the housing 11.

A circular hollow space is formed inside the housing 11. [ The outer shape of the housing 11 may be circular. Alternatively, rectangular or other shapes are possible. The housing 11 may be formed of a metal material such as steel or a copper alloy. In the illustrated example, the housing 11 is divided into a plurality of parts. The separated portions of the housing 11 are integrated with the body 41 of the vibration generating unit 40 to be described later.

The inlet pipe (13) and the outlet pipe (15) are installed so as to communicate with the inside of the housing (11). The object fluid to be cooled flows through the inlet pipe 13 and the object fluid cooled through the outlet pipe 15 flows out.

The heat exchange tube (20) is installed to pass through the other side of the housing (11). The heat exchange tube 20 is connected to a conventional refrigeration cycle to flow cold heat exchange medium. A refrigerant may be used as the heat exchange medium. For example, carbon dioxide can be used as a refrigerant.

The heat exchange medium flowing through the heat exchange tube 20 is heat-exchanged with the target fluid introduced into the housing 11. As a result, the target fluid is cooled while depriving it of heat. When the heat exchange tube 20 is undercooled in this heat exchange process, for example, when the temperature around the heat exchange tube 20 falls below the freezing point of the target fluid, ice is formed from the outer circumference of the heat exchange tube 20. The ice formed at this time greatly reduces the heat exchange efficiency between the heat exchange tube 20 and the target fluid and can cause damage due to the freeze wave.

Therefore, the present invention includes ice preventing means for preventing ice from being formed on the outer circumferential surface of the heat exchange tube due to the supercooling degree of the heat exchange tube (20). Such ice prevention means not only prevents the generation of ice but also removes generated ice.

In the present invention, for example, the ice prevention means is provided with a vibration generating unit that applies vibration to the periphery of the heat exchange tube (20).

The vibration generating unit 40 generates ultrasound vibration and vibrates the heat exchange tube 20 around the vibration generating unit 40, for example.

One example of the vibration generating unit 40 includes a body 41 coupled to the housing 11 in a detachable manner, a vibrator 45 installed on the body 41 to apply vibration to the inside of the housing 11, And an ultrasonic generator 49 connected to the vibrator 45 to vibrate the vibrator 45.

One or more bodies 41 may be provided. A circular hollow space is formed inside the body 41. The inner diameter of the body 41 is the same as the inner diameter of the housing 11. Although the outer shape of the body 41 is shown as a square shape, it may be formed in a different shape such as a circular shape.

The body 41 is disposed between each part of the housing 11 divided into a plurality and is integrally joined to the housing 11. [ The body 41 has flanges 43 on both sides thereof. The flange portion 43 of the body is joined to the flange portion 12 formed on the housing 11 by bolts and nuts.

An airtight pad for airtightness may be provided between the flange portion 43 of the body 41 and the flange portion 12 of the housing 11. [

The vibrator 45 may be provided on each of four sides of the body 41. The vibrator 45 has a conventional structure for converting the high-frequency current applied from the ultrasonic generator 49 into mechanical vibration. For example, the vibrator 45 includes a piezoelectric ceramic body, an electrode surrounding the piezoelectric ceramic body, and a radiation electrode provided on the piezoelectric ceramic body, though not shown. The vibrator 45 is electrically connected to the ultrasonic generator 49 by a cable 47.

The ultrasonic generator 49 has a conventional structure, and an ultrasonic oscillation circuit portion is provided therein to generate a high-frequency current.

In addition to the ultrasonic vibration described above, the vibration generating unit 40 may generate mechanical vibration using a motor and an eccentric cam, or may generate mechanical vibration using a solenoid.

It is preferable that the above-described vibration generating unit is configured to be operated or deactivated according to the temperature around the heat exchange tube 20. [ For example, a temperature sensor 1 may be installed inside the housing 11 to measure the ambient temperature of the heat exchange tube 20. [ The ambient temperature of the heat exchange tube 20 is transferred to the control section 3 by the temperature sensor 1. [ When the temperature measured by the temperature sensor 1 is lower than the set temperature, the control unit 3 applies power to the ultrasonic generator 49 to vibrate the vibrator 45. The vibration of the vibrator 45 is transmitted to the inside of the housing to vibrate the periphery of the heat exchange tube 20 finely. It is possible to effectively prevent ice from forming on the outer circumferential surface of the heat exchange tube due to such ultrasonic vibration.

4 to 6 show a heat exchanger according to another embodiment of the present invention.

The structure of the vibration generating unit 50 of the heat exchanger of the present invention differs from that of the above-described embodiment, and the remaining construction is the same.

The vibration generating unit 50 includes a body 51 coupled to the housing 31 of the cooling bath 30 in a detachable manner and a vibrating medium A vibrator 45 provided on the vibration medium 59 for applying vibration and an ultrasonic generator connected to the vibrator 45 to vibrate the vibrator 45.

One or two or more bodies 51 may be installed. The body 51 has a cylindrical shape and a circular hollow space is formed therein. The body 51 is disposed between the respective portions of the housing 31 divided into a plurality and is integrally coupled to the housing 31. The body 51 has flanges 52 on both sides thereof. The flange portion 52 of the body 51 is coupled to the flange portion 33 formed on the housing 31 by the connecting bar 53 and the connecting bar 53 is coupled by the nut.

The vibration medium 59 is installed inside the body 51 and contacts the heat exchange tube 20.

The illustrated vibration medium 59 includes a ring portion 54 formed with an insertion hole through which the heat exchange tube 20 passes, a mounting portion 55 formed on the outside of the ring portion 54 and on which the vibrator 45 is mounted, (57) formed in the mounting portion (55) to reduce the obstruction of the flow of the object fluid (55).

The heat exchange tube 20 is inserted into the insertion hole of the ring portion 54 and is coupled to the vibration medium 59. The mounting portion 55 is formed on the outside of the ring portion 54. At least one vibrator 45 may be installed in the mounting portion 55 at regular intervals. Since the vibration medium 59 is installed across the inside of the body 51, the mounting portion 55 can obstruct the flow of the object fluid. Accordingly, in order to minimize the flow disturbance of the target fluid, a plurality of cut-out portions 57 are formed in the mounting portion 55. The cutout portions 57 are formed at predetermined intervals in the mounting portion 55. [

The vibrator 45 is mounted on the mounting portion 55 and vibrates. Although not shown, the vibrator 45 is electrically connected to the ultrasonic generator provided on the outside of the cooling bath 30 by the cable 47. When the temperature measured by the temperature sensor falls below a set temperature, the control unit for sensing the temperature around the heat exchange tube 20 through the temperature sensor installed inside the housing 31 applies power to the ultrasonic generator, Vibrate. The vibration generated from the vibrator 45 vibrates around the heat exchange tube 20 to prevent ice from being formed.

7 to 9 illustrate a heat exchanger according to another embodiment of the present invention.

7 to 9, the housing 31 of the cooling tank 30 applied to the illustrated heat exchanger of the present invention has a single structure instead of a structure divided into a plurality of parts as described above.

The vibration generating unit 100 includes a body coupled to the housing 31 so as to be detachable and attachable to the body 31, a vibrator 45 installed on the body to apply vibration to the inside of the housing 31, 45).

One or more bodies may be installed. In the illustrated example, the body is formed to surround the housing 31. That is, the body is provided as a pair of first and second members 101 and 105 which are installed outside the housing 31 and are mutually coupled.

The first and second members 101 and 105 are each formed with a half-circular groove on the inner side. Therefore, circular holes are formed by mutual coupling of the first and second members 101 and 105. [ The first and second members 101 and 105 are mounted on the outer side of the housing in a state where they are separated from each other, and are then coupled to each other. The first and second members 101 and 105 are each formed with flanges for mutual coupling. The flange portion 103 of the first member 101 and the flange portion 106 of the second member 105 are joined by bolts and nuts.

One vibrator 45 is installed on each of four sides of the body to apply vibration to the inside of the housing 31. Although not shown, the vibrator 45 is electrically connected to the ultrasonic generator by the cable 47. When the temperature measured by the temperature sensor falls below a set temperature, the control unit for sensing the temperature around the heat exchange tube 20 through the temperature sensor installed inside the housing 31 applies power to the ultrasonic generator, Vibrate. The vibration generated from the vibrator 45 vibrates around the heat exchange tube 20 to prevent ice from being formed.

10 and 11 illustrate a heat exchanger according to another embodiment of the present invention.

10 and 11, the cooling tank 60 includes a tubular housing 61, an inflow pipe 63 and an outflow pipe 65 formed in the housing 61, A first diaphragm 70 and a first cover 75 to be coupled to each other and a second diaphragm 73 and a second cover 77 to be coupled to the other side of the housing 61.

The inside of the housing 61 is hollow, and both right and left sides are open cylindrical structures. The housing 61 may be formed of a metal material such as steel or a copper alloy.

The inlet pipe (63) and the outlet pipe (65) are installed so as to communicate with the inside of the housing (61). The target fluid to be cooled flows through the inflow pipe 63 and the cooled target fluid flows out through the outflow pipe 65.

A first diaphragm 70 having a plurality of through holes is formed at one side of the housing 61 that is open. A second diaphragm 73 having a plurality of through-holes is provided on the other open side of the housing 61.

A first cover 75 is coupled to the housing 61 to block the open side of the housing 61 and a second cover 77 is attached to the housing 61 to prevent the other side of the housing 61 from being opened. . The first cover (75) and the second cover (77) are formed with flanges and are engaged with flanges provided on both sides of the housing (61).

The first cover 75 is provided with an inflow pipe 78 through which the heat exchange medium is introduced and the second cover 77 is provided with an outflow pipe 79 through which the heat exchange medium flows out.

A plurality of heat exchange tubes (80) are installed in the interior of the housing (61). One side of each heat exchange tube (80) is connected to the through hole of the first diaphragm (70), and the other side is connected to the through hole of the second diaphragm (73). The heat exchange medium flowing into the first cover 75 through the inflow pipe 78 connected to the refrigeration cycle is dispersed into the plurality of through holes formed in the first diaphragm 70 and flows into the heat exchange tube 80. The heat exchange medium having passed through the heat exchange tube 80 is discharged to the inside of the second cover 77 through the through hole of the second diaphragm 73 and then circulated through the outflow tube 79 to the freezing cycle.

In the interior of the housing 61, a plurality of vibration mediums 85 are installed. In the illustrated example, four vibration mediums 85 are installed. The vibration medium 85 is alternately disposed on the upper side and the lower side of the housing 61. Due to the arrangement of the vibration medium 85, the object fluid flowing into the housing 61 flows while forming a zigzag flow, so that the contact time with the heat exchange tube 80 can be increased.

The vibration medium 85 is formed in a substantially plate-like half-moon shape. A plurality of insertion holes are formed in the vibration medium 85, and the heat exchange tubes 80 pass through the insertion holes.

The vibration generating unit includes a vibrator 45 installed in the vibration medium 85 and an ultrasonic generator (not shown) connected to the vibrator 45 to vibrate the vibrator 45. The vibrator and the ultrasonic generator are electrically connected by a cable (not shown).

Although not shown, a controller for sensing the temperature around the heat exchange tube 80 through a temperature sensor installed inside the housing 61 applies power to the ultrasonic generator when the temperature measured by the temperature sensor falls below a set temperature, 45).

On the other hand, Fig. 12 shows another example of the vibration medium 90. Fig. The illustrated vibration medium 90 is a structure divided into a plurality of dividing pieces 95. Each of the dividing pieces 95 is formed with a half-width groove into which the heat exchange tube 80 is inserted, and a flange portion 97 is formed on the rear surface thereof. The split pieces 95 are integrally formed by the engagement of the flange portion 97. [ The vibrator 45 may be provided on all of the dividing pieces 95 or the vibrator may be provided on only some of the dividing pieces 95. [

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, and that various modifications and equivalent embodiments may be made by those skilled in the art. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

10: Cooling tank 11: Housing
20: heat exchange tube 40: vibration generating unit
41: body 45: vibrator
47: cable 49: vibration generator

Claims (7)

delete delete delete delete A cooling tank in which a target fluid to be cooled stays;
A heat exchange tube installed in the cooling bath to contact the object fluid to cool the object fluid and having a heat exchange medium flowing therein;
And an ice prevention means for preventing ice from being formed on an outer circumferential surface of the heat exchange tube due to a supercooling degree of the heat exchange tube,
The ice prevention means includes a vibration generating unit that applies vibration to the periphery of the heat exchange tube,
The vibration generating unit may include a body coupled to the cooling tank in a detachable manner, a vibration medium installed inside the body and in contact with the heat exchange tube, a vibrator installed on the vibration medium to apply vibration, And an ultrasonic generator for vibrating the vibrator,
Wherein the vibrating medium includes a ring portion formed with an insertion hole through which the heat exchange tube passes, a mounting portion formed on an outer side of the ring portion and on which the vibrator is mounted, and a mounting portion for preventing the mounting portion from interfering with the flow of the object fluid And a plurality of cut-outs formed on the heat exchanger.
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