KR20220117663A - Apparatus for heat exchanging - Google Patents

Abstract

The present invention relates to a heat exchanger and, more specifically, to a heat exchanger including a backflow prevention unit. An objective of the present invention is to provide a heat exchanger capable of preventing cold water or cooling water from leaking through a drain hole for freezing and bursting prevention. According to one aspect of the present invention, the heat exchanger comprises: a header in which a first space introducing fluid and a second space discharging fluid are formed; a partition arranged in the header to divide the first space and the second space, and including a vertically penetrated drain hole; a tube plate arranged on the rear side of the partition to form the first space and the second space between the header and the tube plate; a plurality of tubes coupled to the tube plate to communicate with the first space and the second space, arranged on the rear side of the tube plate, and allowing fluid to flow therein; and a backflow prevention unit arranged on a position corresponding to the drain hole and the lower surface of the partition. The backflow prevention unit has an opening part opened in a first direction toward the tube plate.

Description

Heat exchanger {Apparatus for heat exchanging}

The present invention relates to a heat exchanger, and more particularly, to a heat exchanger including a backflow prevention unit.

In general, a chiller supplies cold water to a cold water demanding destination, and heat exchange is performed between a refrigerant circulating in a refrigeration system and cold water circulating between a cold water demanding destination and a refrigeration system to cool the cold water. Such a chiller is a large-capacity facility, and may be installed in a large-scale building.

Meanwhile, the heat exchanger may be used as a condenser or evaporator in a chiller or refrigeration cycle device comprising a compressor, a condenser, an expander, and an evaporator.

The heat exchanger can be divided into a water-cooled type and an air-cooled type according to the heat dissipation method of the heat medium. A water-cooled heat exchanger is a method of dissipating heat by scattering a heat medium in a cooling tower, and an air-cooled heat exchanger is a method of dissipating heat by contacting a heat exchanger through which a heat medium flows with air.

In the case of chillers, since the water-cooled heat exchanger is not affected by the seasons, it is used more than the air-cooled heat exchanger. In addition, the water-cooled heat exchanger has an advantage in that the temperature change of the cooling water is not large, so the management and control of the cooling water temperature is convenient.

However, since the water-cooled heat exchanger exchanges heat with the refrigerant using cold water or cooling water, there is a problem that the cold water or cooling water is frozen in winter. In particular, in a water box or header from which cold water or cooling water is discharged, since the hydraulic pressure is weakest, the remaining cold water or cooling water does not flow out of the header, which is a problem.

Water does not freeze easily in a flowing state, but in a state where the flow is stopped, it freezes easily as the temperature decreases. In this case, as the volume increases during the phase change from liquid to solid, expansion pressure is generated, and freezing occurs in the form of cracks in the pipeline.

As a general measure to prevent such a freeze accident, there is a method of installing a thermal insulation product or a heating device, or a method of mixing antifreeze with water. The method of draining stagnant water is widely used.

However, as the cold water or cooling water flowing into the water box or header flows out through the freezing prevention drain hole, the amount of cold water or cooling water to exchange heat is reduced, and heat exchange efficiency is deteriorated.

In order to solve the above problem, a separate valve may be applied to the drain hole for freezing prevention, but even in this case, foreign substances contained in the cooling water may accumulate in the valve, or the cooling water may freeze between the valves so that the valve performs its function. There may be a problem that it cannot.

An object of the present invention is to provide a heat exchanger capable of preventing cold water or cooling water from leaking through a drain hole for freezing prevention.

Another object of the present invention is to provide a heat exchanger capable of preventing the accumulation of cold water or contaminants contained in the cooling water in a drain hole for preventing freezing.

Another object of the present invention is to provide a heat exchanger capable of preventing performance degradation with a simple structure.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, a header having a first space through which a fluid is introduced and a second space through which a fluid is discharged; a partition wall disposed inside the header to separate the first space and the second space and including a drain hole formed through the first space; a tube plate disposed on the rear side of the partition wall to form the first space and the second space between the header and the second space; a plurality of tubes coupled to the tube plate to communicate with the first space and the second space, disposed behind the tube plate, and having a fluid flowing therein; and a backflow prevention unit disposed at a position corresponding to the drain hole and on a lower surface of the bulkhead, wherein the backflow prevention unit may be provided with a heat exchanger having an opening opened in a first direction toward the tube plate.

In addition, the backflow prevention unit may be provided with a heat exchanger in which the opening has a polygonal shape.

In addition, the backflow prevention unit may be provided with a heat exchanger including a bottom surface disposed to be spaced downward from the drain hole, and a side wall extending from an edge of the bottom surface to a lower surface of the partition wall.

In addition, the bottom surface may have a rectangular shape, and the sidewall may be provided with a heat exchanger formed by extending from the remaining three edges except for the edge on the side of the opening.

In addition, the backflow prevention unit may be provided with a heat exchanger in which at least a portion of the opening has a round shape.

In addition, the backflow preventing unit may be provided with a heat exchanger including a backflow preventing circumferential wall that extends from the lower surface of the partition to the opening and is formed by bending at least a part of the backflow prevention unit.

In addition, the backflow prevention unit is provided with a heat exchanger including a backflow prevention tube having an inlet disposed below the drain hole and a lower surface of the partition wall, the opening being formed at the outlet, and a bent portion formed between the inlet and the outlet can be

In addition, the backflow prevention unit may be provided with a heat exchanger in which a width in a horizontal direction of the opening is 2 to 3 times greater than a diameter of the drain hole.

In addition, the backflow prevention unit may be provided with a heat exchanger in which the width of the opening in the height direction is 2 to 3 times the diameter of the drain hole.

According to the heat exchanger of the present invention, there are one or more of the following effects.

First, there is an advantage in that cold water or cooling water can be prevented from flowing into the drain hole through the backflow prevention unit.

Second, since the backflow prevention unit is opened only in the first direction, it is possible to prevent the cold water or cooling water flowing into the header from flowing back into the drain hole.

Third, there is an advantage that the opening of the backflow prevention unit is formed in an appropriate size to prevent the accumulation of contaminants.

Fourth, there is an advantage in that the performance of the heat exchanger can be prevented from being deteriorated by preventing the outflow of cold water or cooling water to the drain hole through the backflow prevention unit.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 shows a chiller system according to an embodiment of the present invention.
2 illustrates an internal structure of a heat exchanger according to an embodiment of the present invention.
3 is an exploded view of an internal structure of a heat exchanger according to an embodiment of the present invention.
4 is an enlarged view of a header of a heat exchanger according to an embodiment of the present invention.
5 is a view showing the flow direction of cold water in the heat exchanger.
6 is a cross-sectional view of a header in which a backflow prevention unit is disposed according to an embodiment of the present invention.
7 shows a backflow prevention unit according to an embodiment of the present invention.
8 is a cross-sectional view of a header in which a backflow prevention unit is disposed according to another embodiment of the present invention.
9 is a view illustrating a backflow prevention unit according to another embodiment of the present invention as viewed from the front.
10 is a cross-sectional view of a header in which a backflow prevention unit is disposed according to another embodiment of the present invention.
11 is a view illustrating a backflow prevention unit according to another embodiment of the present invention as viewed from the front.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. The front (F), rear (R), left (Le), right (Ri), upper (U), and lower (D) marks shown in the drawings are for explanation of the heat exchanger according to the present embodiment. Accordingly, if the reference is changed, the direction setting may be differently grasped.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural, unless specifically stated otherwise in the phrase. As used herein, "comprises" and/or "comprising" means that a referenced component, step and/or action excludes the presence or addition of one or more other components, steps and/or actions. I never do that.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

In the drawings, the thickness or size of each component is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. Also, the size and area of each component do not fully reflect the actual size or area.

Hereinafter, a heat exchanger according to the present invention will be described with reference to the drawings.

1 is a view showing a chiller system according to an embodiment of the present invention.

Referring to FIG. 1 , the chiller system 1 according to an embodiment of the present invention has a condenser 200 for condensing the refrigerant by exchanging heat with a refrigerant and cooling water, and an expander 300 for expanding the refrigerant condensed in the condenser 200 . , an evaporator 400 formed to heat exchange between the refrigerant expanded in the expander 300 and cold water to cool the cold water with evaporation of the refrigerant, and a compressor 500 formed to compress the refrigerant evaporated in the evaporator 400 .

In addition, the chiller system 1 according to an embodiment of the present invention includes a cooling water unit 600 that heats the cooling water through heat exchange between the refrigerant compressed in the condenser 200 and the cooling water, and the expanded in the evaporator 400 . It further includes an air conditioning unit 700 for cooling the cold water through heat exchange between the refrigerant and the cold water.

The condenser 200 provides a place for exchanging the high-pressure refrigerant compressed in the compressor 500 with the cooling water flowing in from the cooling water unit 600 . The high-pressure refrigerant is condensed through heat exchange with the cooling water.

The condenser 200 may be configured as a shell-tube type heat exchanger. Specifically, the high-pressure refrigerant compressed in the compressor 500 is introduced into the condensing space corresponding to the internal space of the condenser 200 through the condenser connection passage 550 . In addition, the inside of the condensing space includes a cooling water flow path 210 through which the cooling water flowing in from the cooling water unit 600 can flow.

The cooling water flow path 210 includes a cooling water inflow path 211 through which cooling water is introduced from the cooling water unit 600 and a cooling water discharge path 212 through which the cooling water is discharged to the cooling water unit 600 . The cooling water introduced into the cooling water inlet flow path 211 exchanges heat with the refrigerant inside the condensing space, and then passes through the cooling water connection flow path 240 provided at one end or outside of the condenser 200 and flows into the cooling water discharge flow path 212 .

The cooling water inlet passage 211 may be connected to the cooling water inlet tube 221 through the condenser header 230 . The cooling water discharge passage 212 may be connected to the cooling water discharge tube 222 through the condenser header 230 . That is, the condenser header 230 may include the coolant tube 220 .

The cooling water unit 600 and the condenser 200 are connected via the cooling water tube 220 . The cooling water tube 220 may be made of a material such as rubber to not only become a passage through which the cooling water flows between the cooling water unit 600 and the condenser 200 but also to prevent leakage to the outside.

The cooling water tube 220 includes a cooling water inlet tube 221 connected to the cooling water inlet passage 211 and a cooling water discharge tube 222 connected to the cooling water discharge passage 212 . Looking at the flow of the cooling water as a whole, the cooling water after heat exchange with air or liquid in the cooling water unit 600 is introduced into the condenser 200 through the cooling water inlet tube 221 .

The cooling water introduced into the condenser 200 passes through the cooling water inlet passage 211, the cooling water connection passage 240, and the cooling water discharge passage 212 provided in the condenser 200 in turn. After exchanging heat with the refrigerant, it flows back into the cooling water unit 600 through the cooling water discharge tube 222 .

Looking at the flow of the cooling water, the cooling water unit 600, the cooling water inlet tube 221, the condenser header 230, the cooling water inlet passage 211 through the inner end of the condenser 200 or provided outside the condenser 200 After passing through the cooling water connection path 240 , the cooling water flows back into the cooling water unit 600 through the cooling water discharge path 212 , the condenser header 230 , and the cooling water discharge tube 222 .

Meanwhile, the cooling water that has absorbed heat of the refrigerant through heat exchange in the condenser 200 may be air-cooled in the cooling water unit 600 . The cooling water unit 600 includes a cooling water inlet pipe 610 that is an inlet through which the cooling water that has absorbed heat through the main body 630 and the cooling water discharge tube 222 is introduced, and the cooling water after being cooled inside the cooling water unit 600, the cooling water is discharged. It is composed of a cooling water discharge pipe 620 which is an outlet.

The cooling water unit 600 may use air to cool the cooling water introduced into the main body 630 . Specifically, the main body 630 is provided with a fan for generating a flow of air and includes an air outlet 631 through which air is discharged, and an air inlet 632 corresponding to an inlet through which air is introduced into the main body 630 . do.

Air discharged after heat exchange at the air outlet 631 may be used for heating. The refrigerant that has undergone heat exchange in the condenser 200 is condensed and pooled in the lower portion of the condensing space. The accumulated refrigerant flows into the refrigerant box 250 provided in the condensing space and then flows into the expander 300 .

The refrigerant box 250 flows into the refrigerant inlet 251 , and the introduced refrigerant is discharged through the evaporator connection passage 260 . The evaporator connection passage 260 includes an evaporator connection passage inlet 261 , and the evaporator connection passage inlet 261 may be located below the refrigerant box 250 .

The evaporator 400 includes an evaporation space in which heat exchange occurs between the refrigerant expanded in the expander 300 and the cold water. The refrigerant that has passed through the expander 300 in the evaporator connection passage 260 is connected to the refrigerant injection device 450 provided in the evaporator 400, and the refrigerant injection hole 451 provided in the refrigerant injection device 450 is connected to the It is then spread evenly into the evaporator 400 .

In addition, the evaporator 400 is provided with a cold water passage 410 including a cold water inflow passage 411 through which cold water is introduced into the evaporator 400 and a cold water discharge passage 412 through which cold water is discharged to the outside of the evaporator 400 . do.

The cold water is introduced or discharged through the cold water tube 420 in communication with the air conditioning unit 700 provided outside the evaporator 400 . The cold water tube 420 includes a cold water inlet tube 421 that is a passage for the cold water inside the air conditioning unit 700 to the evaporator 400 and a passage for the cold water that has undergone heat exchange in the evaporator 400 to the air conditioning unit 700 . It is composed of a phosphorus cold water discharge tube (422). That is, the cold water inlet tube 421 communicates with the cold water inlet passage 411 , and the cold water discharge tube 422 communicates with the cold water discharge passage 412 .

The cold water inlet passage 411 may be connected to the cold water inlet tube 421 through the evaporator header 430 . The cold water discharge passage 412 may be connected to the cold water discharge tube 422 through the evaporator header 430 . That is, the evaporator header 430 may include a cold water tube 420 .

Looking at the flow of cold water, the air conditioning unit 700, the cold water inlet tube 421, the evaporator header 430, the cold water inlet passage 411 through the inner end of the evaporator 400 or provided on the outside of the evaporator 400 After passing through the cold water connection passage 440 , the cold water flows back into the air conditioning unit 700 through the cold water discharge passage 412 , the evaporator header 430 , and the cold water discharge tube 422 .

The air conditioning unit 700 cools the cold water through the refrigerant. The cooled cold water absorbs heat from the air in the air conditioning unit 700 to enable indoor cooling. The air conditioning unit 700 includes a cold water discharge pipe 720 communicating with the cold water inlet tube 421 and a cold water inlet pipe 710 communicating with the cold water discharge tube 422 . The refrigerant after heat exchange in the evaporator 400 is introduced back into the compressor 500 through the compressor connection passage 460 .

2 illustrates an internal structure of a heat exchanger according to an embodiment of the present invention.

3 is an exploded view showing the internal structure of the heat exchanger according to an embodiment of the present invention.

The heat exchanger 100 according to an embodiment of the present invention may be used as the condenser 200 or the evaporator 400 in the chiller system 1 . In the following specification, the heat exchanger 100 is described based on the evaporator 400 , but is not limited thereto. That is, the heat exchanger 100 using cold water as a fluid may be referred to as an evaporator 400 , and the heat exchanger 100 using cooling water as a fluid may be referred to as a condenser 200 .

2 to 3 , the heat exchanger 100 includes a plurality of tubes 110 that exchange heat with an external refrigerant while a fluid flows therein, and a header connected to the plurality of tubes 110 through which the fluid flows. 130 may be included.

Referring to FIG. 2 , only one tube 110 is shown for convenience of description, but the number of tubes 110 is not limited thereto. That is, at least one tube 110 may exist in plurality, and the plurality of tubes 110 may form a flow path through which the cold water flows.

The plurality of tubes 110 may include a plurality of fluid inlet tubes 111 forming a fluid inlet channel and a plurality of fluid outlet tubes 112 forming a fluid outlet channel. The fluid introduced into the heat exchanger 100 passes through the fluid inlet tube 111 and the fluid outlet tube 112 provided in the heat exchanger 100 to heat the refrigerant and heat introduced into the heat exchanger 100 . can be exchanged

For example, the fluid can take heat from the refrigerant and condense the refrigerant. In this case, the heat exchanger 100 may act as a condenser.

For example, the fluid may transfer heat to the refrigerant to evaporate the refrigerant. In this case, the heat exchanger 100 may act as an evaporator.

Referring to FIG. 3 , the header 130 includes a tube plate 131 connecting the fluid inlet tube 111 and the fluid outlet tube 112 and a fluid inlet 132 through which cold water or cooling water enters and exits from an external unit. can

A plurality of tube coupling holes 136 are formed in the tube plate 131 , and one end of the tube 110 may be inserted into the tube coupling hole 136 . The fluid may be introduced into the tube 110 through the tube coupling hole 136 of the tube plate 131 or discharged from the tube 110 . The plurality of tube coupling holes 136 are disposed vertically, and one end of the fluid inlet tube 111 is coupled to the tube coupling hole 136 formed at the lower portion, and one end of the fluid discharge tube 112 is coupled to the tube formed at the top. It may be coupled to the hole 136 . The fluid inlet tube 111 may communicate with a first space S1 to be described later, and the fluid discharge tube 112 may be disposed to communicate with a second space S2 to be described later.

The fluid inlet 132 may include a fluid inlet 132-1 and a fluid outlet 132-2. A first pipe 121 may be in communication with the fluid inlet 132-1, and cold water or cooling water for heat exchange with a refrigerant from an external unit may be introduced into the header 130 through the first pipe 121. . The second pipe 122 may be in communication with the fluid discharge port 132 - 2 , and cold water or cooling water having completed heat exchange with the refrigerant may be discharged from the header 130 to the external unit.

4 is an enlarged view of a header of a heat exchanger according to an embodiment of the present invention.

4, the heat exchanger 100 divides the internal space of the header 130 into a first space (S1) through which a fluid is introduced and a second space (S2) through which a fluid is discharged. It may include a drain hole 134 penetrating the partition wall 133 in a vertical direction, a backflow prevention unit 140 disposed below the drain hole 134 and a lower surface of the partition wall 133 .

The first space S1 may be a space through which a fluid introduced for heat exchange with a refrigerant enters and exits. The fluid may be accumulated in the first space S1 and introduced into the fluid inlet tube 111 by pressure.

The second space S2 may be a space through which a refrigerant and a fluid that has completed heat exchange enters and exits. The fluid may be accumulated in the second space S2 and discharged to the fluid discharge port 132 - 2 by pressure.

The partition wall 133 may be formed inside the header 130 to divide the internal space of the header 130 so that the inflow fluid and the discharged fluid do not mix. The partition wall 133 may divide the internal space of the header 130 so that the first space S1 is located at the lower side and the second space S2 is located at the upper side.

The drain hole 134 may be formed in the partition wall 133 and may be formed to vertically penetrate the partition wall 133 . The drain hole 134 may drain the fluid remaining in the second space S2 . When the temperature of the fluid remaining in the second space S2 is lowered, it may freeze and cause a freezing accident. Therefore, the drain hole 134 may have a structure necessary to prevent freezing.

The fluid passing through the drain hole 134 may be introduced into the first space S1 and may be discharged to the outside of the heat exchanger 100 through the drain pipe 137 located under the first space S1 .

The header 130 may include a drain pipe 137 on a lower surface of the header 130 . The drain pipe 137 may be disposed to communicate with the first space S1 of the header 130 . The drain pipe 137 discharges the fluid remaining in the first space S1, thereby preventing a freezing accident.

The drain hole 134 is a hole passing through the partition wall 133 and may be disposed closer to the tube plate 131 than the fluid inlet 132 according to an embodiment. In this case, the partition wall 133 may be formed to be inclined downward in a direction from the fluid inlet 132 side toward the tube plate 131 .

The fluid remaining in the second space S2 may flow in the direction toward the tube plate 131 along the downward slope of the partition wall 133 , and may exit into the first space S1 through the drain hole 134 . Therefore, the position of the drain hole 134 and the inclination of the partition wall 133 may help smooth drainage of the fluid remaining in the second space S2 .

5 is a view showing the flow direction of cold water in the heat exchanger.

Referring to FIG. 5 , a direction flowing into the first space S1 from the fluid inlet 132-1 is a direction discharging from the first direction D1 and the second space S2 to the fluid outlet 132-2. In the second direction D2 , the draining direction from the second space S2 to the first space S1 through the drain hole 134 is the third direction D3 and the first space through the drain hole 134 . A direction in which a reverse flow from (S1) to the first space (S1) may be defined as a fourth direction (D4).

When the backflow prevention unit 140 is not provided at the lower side of the drain hole 134, the cold water introduced through the fluid inlet 132-1 flows into the fluid inlet tube 111 by pressure, but some cold water is Accordingly, a reverse flow may occur through the drain hole 134 in the fourth direction D4 direction. However, when the backflow prevention unit 140 is provided, cold water may be drained from the second space S2 to the first space S1 through the drain hole 134 , but the cold water may be drained from the first space S1 . Backflow into the second space S2 can be prevented.

6 is a cross-sectional view of a header on which a backflow prevention unit is disposed according to an embodiment of the present invention.

7 shows a backflow prevention unit according to an embodiment of the present invention.

Hereinafter, a backflow prevention unit 140 according to an embodiment of the present invention will be described with reference to FIGS. 6 and 7 .

As described above, the backflow prevention unit 140 may be disposed at a position corresponding to the drain hole 134 , that is, a lower side of the drain hole 134 and a lower surface of the partition wall 133 . The backflow prevention unit 140 may have an opening 141 that is opened in a direction toward the tube plate 131 , that is, in the first direction D1 . A portion other than the first direction D1 may not be opened and may be formed to be isolated from the first space S1 .

In the backflow prevention unit 140 according to an embodiment of the present invention, the opening 141 may have a polygonal shape. In this case, the backflow prevention unit 140 may include a bottom surface 144 disposed to be spaced downward from the drain hole 134 . The backflow prevention unit 140 may include a side wall extending from the edge of the bottom surface 144 to the lower surface of the partition wall 133 .

If the shape of the bottom surface 144 is a rectangular shape, the side wall extending from the bottom surface 144 to the lower surface of the partition wall 133 forms an opening 141 among the edges of the bottom surface 144 . It may be formed to extend to the lower surface of the partition wall 133 from the edges of the remaining three sides except for the edges on the side of the opening 141 . In this case, each of the sidewalls 145 includes the first sidewall 145-1 and the second sidewall 145-2, the first sidewall 145-1 and the second sidewall 145-1 forming the side surface of the backflow prevention unit 140. It may include a third sidewall 145-3 disposed between the second sidewalls 145-2 to form a rear surface of the backflow prevention unit 140 .

When the cold water in the first space (S1) flows in the first direction (D1), the backflow prevention unit 140 flows in the second direction (D2) or flows in the fourth direction (D4) to the drain hole (134) This will prevent backflow of cold water.

In addition, the backflow prevention unit 140 allows the cold water stored in the second space S2 to flow in the third direction D3 through the drain hole 134 and then to flow in the first direction D1 to drain the cold water. can

8 is a cross-sectional view of a header in which a backflow prevention unit is disposed according to another embodiment of the present invention.

9 is a view illustrating a backflow prevention unit according to another embodiment of the present invention as viewed from the front.

Hereinafter, a backflow prevention unit 140 according to another embodiment of the present invention will be described with reference to FIGS. 8 and 9 .

Referring to FIG. 8 , in the backflow prevention unit 140 according to another embodiment of the present invention, at least a portion of the opening 141 may be formed in a round shape. In addition, the backflow prevention unit 140 is formed to extend from the lower surface of the partition wall 133 to the opening 141, and may be formed by bending at least a part of it. That is, the backflow prevention unit 140 may have at least a partially rounded shape of the opening 141 , and may be formed in a shape that is gently bent from the lower surface of the partition wall 133 to the opening 141 .

In this case, the backflow prevention unit 140 may include a backflow prevention circumferential wall 146 corresponding to the bottom surface 144 and the sidewall 145 of the backflow prevention unit 140 according to an embodiment of the present invention. . The backflow prevention circumferential wall 146 may form an opening 141 of a semi-circular shape, as shown in FIG. 9 , and may be formed gently as a whole. However, the shape of the opening 141 is not limited to a semicircle.

In addition, since the backflow prevention circumferential wall 146 includes a portion in a shape that is gently bent from the lower surface of the partition wall 133 to the opening 141 , the first from the second space S2 through the drain hole 134 . The cold water drained into the space S1 may flow while the flow direction is gently changed from the third direction D3 to the fourth direction D4 . In addition, due to the backflow prevention circumferential wall 146, it is possible to reduce the flow resistance of the cold water flowing from the first space (S1) to the tube coupling hole (136) in the first direction (D1).

10 is a cross-sectional view of a header in which a backflow prevention unit is disposed according to another embodiment of the present invention.

11 is a view illustrating a backflow prevention unit according to another embodiment of the present invention as viewed from the front.

Hereinafter, a backflow prevention unit 140 according to another embodiment of the present invention will be described with reference to FIGS. 10 and 11 .

The backflow prevention unit 140 according to another embodiment of the present invention may have a tubular shape. Hereinafter, the inlet and outlet of the tubular backflow prevention unit 140 are referred to as a drain inlet 142 and a drain outlet 143 .

Specifically, the drain inlet 142 is disposed on the lower side of the drain hole 134 and on the lower surface of the partition wall 133 so that the drain inlet 142 communicates with the drain hole 134 , and at the drain outlet 143 . The opening 141 may be formed, and a bent portion 148 may be formed in at least a portion between the drain inlet 142 and the drain outlet 143 .

In this case, the backflow prevention unit 140 may include a tubular backflow prevention pipe 147 . The backflow prevention pipe 147 has the aforementioned drain inlet 142 and drain outlet 143 formed, a bent portion 148 is formed between the drain inlet 142 and the drain outlet 143, and the drain outlet ( An opening 141 is formed in 143 .

Referring to FIG. 11 , the shape of the opening 141 formed in the drain inlet 142 may be circular. However, the shape of the opening 141 is not limited thereto. In addition, referring to FIG. 11 , the opening 141 may be disposed to be spaced apart from the lower surface of the partition wall 133 . In this case, the flow distance of the cold water falling through the drain hole 134 is increased, so that the cold water is fast. Flow separation can be prevented from forming when drained at a flow rate.

In addition, since the backflow prevention pipe 147 includes the bent part 148 as described above, like the backflow prevention circumferential wall 146, from the lower surface of the partition wall 133 to the opening 141, or the drain inlet ( It may be formed by gently bending from 142 to the drain outlet 143 . For this reason, the cold water drained from the second space S2 to the first space S1 through the drain hole 134 flows while gently changing the flow direction from the third direction D3 to the first direction D1. can do. In addition, there is an effect of reducing the flow resistance of the cold water flowing from the first space (S1) in the first direction (D1).

In one embodiment, another embodiment, and another embodiment of the backflow prevention unit 140 of the present invention, the width of the opening 141 may be formed to be between 2 and 3 times the diameter of the drain hole 134 .

In the backflow prevention unit 140 , the width in the horizontal direction of the opening 141 may be formed to be 2 to 3 times the diameter of the drain hole 134 , and the backflow prevention unit 140 has a width in the height direction of the opening 141 . It may be formed to be 2 to 3 times the diameter of the drain hole 134 .

If the size of the opening 141 is too small, a flow resistance may be greatly applied to the cold water drained from the drain hole 134 , so that the drain flow may not be smoothly formed. In addition, there may be a problem that foreign substances contained in the cold water may be caught or accumulated in the backflow prevention unit 140 .

Conversely, if the size of the opening 141 is too large compared to the diameter of the drain hole 134 , the flow resistance to the cold water flowing from the first space S1 to the first direction D1 , that is, the fluid inlet tube 111 is large. There may be issues that might work.

Accordingly, the width of the opening may be preferably 2 to 3 times the diameter of the drain hole 134 . Since the width of the opening 141 is sufficiently larger than the diameter of the drain hole 134 , the flow of the cold water discharged from the drain hole 134 is not obstructed, and at the same time, even if foreign substances are accumulated, they can be removed during the draining process. In addition, since the size of the backflow prevention unit 140 is not too large, flow resistance in the first direction D1 may be minimized.

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Various modifications may be made by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

1: Chiller system
100: heat exchanger
110: tube
111: fluid inlet tube
112: fluid discharge tube
121: inlet pipe
122: discharge pipe
130 : header
131: tube plate
132: fluid inlet
133: bulkhead
134: drain hole
135: header cover
136: tube coupling hole
137: drain pipe
140: backflow prevention unit
141: opening
142: drain inlet
143: drain outlet
144: bottom surface
145: side wall
146: backflow prevention circumferential wall
147: backflow prevention pipe
148: bend
200: condenser
300: expansion valve
400: evaporator
500: compressor
600: cooling water unit
700: air conditioning unit
D1: first direction
D2: second direction
D3: 3rd direction
D4: 4th direction
S1: first space
S2: second space

Claims (9)

a header having a first space through which the fluid is introduced and a second space through which the fluid is discharged;
a partition wall disposed inside the header to separate the first space and the second space and including a drain hole formed through the first space;
a tube plate disposed on the rear side of the partition wall to form the first space and the second space between the header and the second space;
a plurality of tubes coupled to the tube plate to communicate with the first space and the second space, disposed behind the tube plate, and having a fluid flowing therein; and
and a backflow prevention unit disposed at a position corresponding to the drain hole and on a lower surface of the partition wall,
The backflow prevention unit is a heat exchanger having an opening opened in a first direction toward the tube plate. The method of claim 1,
The backflow prevention unit,
A heat exchanger in which the opening has a polygonal shape. 3. The method of claim 2,
The backflow prevention unit,
a bottom surface disposed to be spaced downward from the drain hole; and
and a side wall extending from an edge of the bottom surface to a lower surface of the partition wall. 4. The method of claim 3,
The bottom surface has a rectangular shape,
The side wall is
A heat exchanger formed to extend from the remaining three edges except for the edge of the opening side. The method of claim 1,
The backflow prevention unit,
A heat exchanger in which at least a portion of the opening has a round shape. The method of claim 1,
The backflow prevention unit,
and a backflow prevention circumferential wall extending from the lower surface of the partition wall to the opening and formed by bending at least a portion. The method of claim 1,
The backflow prevention unit,
and a non-return pipe having an inlet disposed below the drain hole and a lower surface of the partition wall, the opening being formed at the outlet, and a bent portion formed between the inlet and the outlet. 8. The method according to any one of claims 1 to 7,
The backflow prevention unit,
A heat exchanger in which the width of the opening in the transverse direction is between 2 and 3 times the diameter of the drain hole. 8. The method according to any one of claims 1 to 7,
The backflow prevention unit,
A heat exchanger in which the width in the height direction of the opening is between 2 and 3 times the diameter of the drain hole.

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