KR100585403B1 - heat exchanger of header type - Google Patents

Abstract

According to the present invention, a plurality of flat tubes having a refrigerant flow path formed therein are arranged to maintain a constant distance from each other, and corrugated pins are disposed between the adjacent tubes to facilitate heat exchange, and tubular headers are provided at both ends of the respective tubes. In the header type heat exchanger in which the tube is connected in communication with the tube, in the middle of the tubular headers 36 and 38, the main diaphragms 42 and 44 which divide the inside of the tubular header into two side spaces in the width direction are the length of the tubular header. And the diaphragms 42 and 44 are connected to both side spaces of the header on the side thereof, and holes through which the refrigerant can flow are formed differently in accordance with the refrigerant flow direction, so that the refrigerant is smoothly distributed and heat exchanged. The air outlet air temperature is kept constant, improving pressure resistance and corrosion resistance.

Description

Heat exchanger of header type

1 is a perspective view showing a conventional laminated heat exchanger,

2 is a refrigerant flow chart of a conventional stacked heat exchanger.

3 is a perspective view showing a header type heat exchanger according to the present invention;

4 is a cross-sectional view of the tubular header of FIG.

5 is a perspective view of the tube of FIG. 3;

6 is a block diagram of a header type heat exchanger when the refrigerant flows through the tube in four passes in the present invention;

7 is an elevation view showing the main diaphragm (upper and lower side) of FIG. 6;

8 is a flow chart of the refrigerant when the refrigerant flows through the tube in four passes in the present invention;

9 is a block diagram of a header type heat exchanger when the refrigerant flows through the tube in two passes in the present invention;

FIG. 10 is an elevation view showing the main diaphragm (upper and lower side) of FIG.

<Description of the symbols for the main parts of the drawings>

32: tube 34: corrugated pin

36: first tubular header 38: second tubular header

40: end plate 42, 44: main plate

46, 48: Insertion groove 50: End cap

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a header type heat exchanger, which is suitable for use as an evaporator of a vehicle air conditioner, improves pressure resistance and corrosion resistance, facilitates the flow of refrigerant, and relates to a header type heat exchanger. .

In general, as shown in FIG. 1, a plurality of first and second tube elements 2 and 4 are welded to each other, and a refrigerant passage is formed therein, and a refrigerant passage is formed below the refrigerant passage. First and second tanks 6 and 8 are formed to collect and flow the coolant flowing in the passage, and a coolant inlet or outlet to allow the coolant to enter and exit the first tank 6 on one side of the second tube element. 10 and 12 are formed, respectively, and the pleat pins 14 are disposed between the first and second tube elements 2 and 4 so that the refrigerant flowing in the refrigerant passage and the external air are easily exchanged with each other. It is.

In the longitudinal middle part of the first tank part 6, two divisions are performed such that the refrigerant introduced into the first tank part 6 from the refrigerant inlet part 10 does not flow toward the refrigerant inlet part 12. Partitions are formed to form the tanks 6a and 6b.

The first and second tube elements 2 and 4 have a generally rectangular shape, and are joined to each other so that a space can be formed therein by two forming plates, and the first and second tube elements 2 and 4 are formed at one end in the longitudinal direction of the forming plate. Tank container portions 16 and 18 are formed to form second tank portions 6 and 8, and passages form a U-type refrigerant passage from the one tank container portion 16 toward the other tank container portion 18. The container part 20 is formed.

In the stacked heat exchanger configured as described above, the low-temperature low-pressure refrigerant in the gas-liquid two-phase state flowing into the heat exchanger through the refrigerant inlet portion 10 is divided into a split tank 6a on the left side, a U-shaped refrigerant passage, and a second tank. The heat exchanger is heat-exchanged with the outside air by the corrugated fins 14 while sequentially passing the left part of the part 8, the right part of the second tank part 8, the U-shaped refrigerant passage, and the right side split tank 6b. It changes to a state and flows out into a refrigerant pipe through the refrigerant | coolant access part 12. The flow of refrigerant is indicated by arrows in FIG.

By the way, according to the conventional laminated heat exchanger configured as described above, there is a problem in that the pressure resistance is inferior because it is manufactured by welding the tube element press-formed to form the tank portion and the tube portion.

In recent years, HVAC (air circulation unit) of an automobile air conditioner has been changed to a center mounting method or a semi-center mounting method. The HVAC is characterized in that the air heat exchanged in the heat exchanger is supplied to the ascending dimension of the vehicle. In this case, the deviation of the outlet air temperature of the heat exchanger causes discomfort to the ascension of the vehicle. In order to improve such discomfort, the uniformity of temperature distribution of the heat exchanger outlet air is required. In the conventional multilayer heat exchanger, a temperature deviation of the fluid occurs in the flow path configuration, thereby lowering the temperature distribution of the refrigerant, and in particular, miniaturizing the heat exchanger. There is a problem that a lot of constraints result in a decrease in heat transfer performance.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a header type heat exchanger which is suitable for use as an evaporator of a vehicle air conditioner and which improves pressure resistance and corrosion resistance and facilitates the flow of refrigerant. have.

Another object of the present invention is to provide a header type heat exchanger which makes the temperature distribution in the heat exchanger uniform.

In the header type heat exchanger according to the present invention, a plurality of flat tubes having a refrigerant flow path formed therein are arranged to maintain a constant distance from each other, and a corrugated fin for facilitating heat exchange is disposed between the adjacent tubes. A header type heat exchanger having a tubular header connected to the tube at both ends thereof, wherein a main diaphragm for partitioning the inside of the tubular header into two side spaces in the width direction is provided in the longitudinal direction of the tubular header. It is characterized by.

The tube may be an extruded tube formed therein with at least two flow passages each communicating with a space partitioned by the main diaphragm, or two tubes each communicating with both spaces of the tubular header.

In the main diaphragm, a plurality of holes are formed at predetermined intervals along the longitudinal direction of the main diaphragm so as to communicate both spaces in the width direction of the tubular header in accordance with the upper and lower positions of the tubular header and the refrigerant flow path. At this time, when the tubular header in which the main diaphragm in which the hole is formed is disposed is located on the upper side of the heat exchanger, the hole is gradually reduced in the refrigerant moving direction inside the tubular header located on the lower side, and the hole is formed. When the tubular header in which the main diaphragm is disposed is located at the lower side of the heat exchanger, the hole is gradually enlarged along the refrigerant traveling direction inside the tubular header located at the upper side.

Inside the tubular header is provided an auxiliary plate for dividing the longitudinal direction of the tubular header into a plurality of spaces according to the number of passes of the refrigerant.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view of a header type heat exchanger according to the present invention used as an evaporator. In the present embodiment, as shown in Fig. 8, an evaporator passing through a tube while making four passes will be described as an example. As shown, a plurality of flat tubes 32 having a refrigerant flow path formed therein are arranged to maintain a constant distance from each other, and a corrugated fin 34 for facilitating heat exchange is disposed between the adjacent tubes 32. First and second tubular headers 36 and 38 are connected to both ends of the tubes 32 so as to communicate with the tubes 32. In addition, at the beginning and the end of the arranged tube 32, the end plate 40 is deposited on the pleat pin 34 and disposed.

In the header type heat exchanger used as the evaporator, the first and second tubular headers 36 and 38 are positioned in the horizontal direction on the upper side and the lower side, respectively, and the tubular header positioned in the upper side (in this embodiment, the first tubular header). The refrigerant inlet and outlet are respectively formed.

The first and second tubular headers 36 and 38 have a spectacle frame cross-sectional shape as shown in FIG. 4, and the inside of the tubular header is formed in the width direction in the middle of the first and tubular headers 36 and 38. Main plates 42 and 44 (not shown), which are divided into both side spaces S1 and S2, are installed in the lengthwise direction of the tubular header (see Fig. 8).

Insertion grooves 46 and 48 are formed in the first and second tubular headers 36 and 38 so that the main partition plates 42 and 44 are inserted and welded. The insertion grooves 46 and 48 are formed in protrusions formed to protrude inward. As shown in FIG. 3, a coolant inlet 36a and a coolant outlet 36b are formed at one end of the first tubular header 36, and an end cap 50 is coupled to the other end of the first tubular header 36. End caps 50 are respectively coupled to both side ends of the second tubular header 38. As shown in FIG. 6, the auxiliary plate 52 is coupled to the middle of the first tubular header 36 in the longitudinal direction so that the refrigerant forms four passes as shown in FIG. 8.

As shown in Fig. 5, the tube 32 is an extruded tube having a plurality of flow paths 32a and 32b formed therein, each communicating with the compartment spaces S1 and S2 of the tubular headers 36 and 38, respectively. have. In the present embodiment, eight flow paths are formed so as to communicate with each of the partition spaces S1 and S2 four by four. However, at least two flow paths communicating with the partition spaces S1 and S2 may be formed. . In addition, fine protrusions may be formed on the inner surfaces of the flow paths 32a and 32b to disturb the refrigerant to promote heat exchange.

In addition, the tube may be composed of two tubes each communicating with both compartments of the tubular header.

The main diaphragm is formed with a plurality of holes communicating the space between the two sides in the width direction of the tubular header at predetermined intervals along the longitudinal direction of the main diaphragm in accordance with the upper and lower positions of the tubular header and the refrigerant flow path. As shown in the figure, when the tubular header (first tubular header) 36 in which the main diaphragm 42 having the hole 42a is formed is located above the heat exchanger, the hole 42a is located below the tubular body. It is formed gradually smaller along the refrigerant advancing direction inside the header (second tubular header: 38).

In the header type heat exchanger according to the present invention configured as described above, the refrigerant exchanges heat with external air while passing through the tube 32 in four passes as shown in FIG. That is, the refrigerant flowing into the refrigerant inlet 36a of the first tubular header 36 flows downward from the left front side of the first tubular header 36 (P1: first pass), and the second tubular header 38 After moving from the front of the right side to the right side of the second tubular header 38 flows upward from the right front side (P2: second pass), the right back through the hole 42a in the right front of the first tubular header 36 After moving to the lower side from the right rear of the first tubular header 36 (P3: 3rd pass), the second tubular header 38 of the second tubular header 38 after moving to the left It flows from the left rear to the upper side (P4: fourth pass), moves from the rear of the first tubular header 36 to the left, and flows out through the refrigerant outlet 36b.

On the other hand, as shown in Figs. 9 and 10, when the refrigerant flows through the tube in two passes without the auxiliary plate (52 in Fig. 6), that is, the tubular header in which the main diaphragm 144 with the holes 144a is formed is disposed. When the second tubular header 38 is located at the lower side of the heat exchanger, the hole 144a is gradually enlarged in the refrigerant traveling direction inside the tubular header (first tubular header 36) located at the upper side. .

The header type heat exchanger of the present invention can differentiate the thickness of the tank portion and the tube portion by forming the tank portion and the tube portion separately, so that the sacrificial corrosion material is added to the tube portion to protect the corrosion of the tube portion, while the tank portion is protected by the sacrificial corrosion agent. It is vulnerable to corrosion because it can not be, but can increase the thickness to bring the effect of corrosion resistance and strength (improved pressure resistance).

In addition, the temperature distribution in a general heat exchanger is determined by the flow rate distribution of the liquid refrigerant, which is greatly influenced by gravity and inertia. When the header (tank) is located at the top of the header type heat exchanger, the refrigerant is greatly influenced by gravity, and the refrigerant tends to be biased in the tube near the refrigerant inlet. In addition, when the header (tank) is located in the lower portion, the refrigerant is more influenced by the inertia force than gravity, and the refrigerant tends to be biased in the tube opposite the refrigerant inlet. According to the present invention, a plurality of holes are formed at predetermined intervals along the longitudinal direction of the main diaphragm to form a plurality of holes communicating the space between the two sides in the width direction of the tubular header in accordance with the upper and lower positions of the tubular header and the refrigerant flow path, Because of this, it is possible to improve the unevenness of the outlet air temperature due to the refrigerant deflection phenomenon.

That is, in the present invention, as shown in Fig. 6, when the tubular header (first tubular header: 36) in which the main diaphragm 42 having the hole 42a is formed is located above the heat exchanger, the hole 42a is provided. ) Is gradually smaller along the refrigerant flow direction inside the tubular header (second tubular header: 38) located below. Accordingly, in the second tubular header 38, the influence of the inertia force is greater than gravity, so that the refrigerant is biased in the tube opposite the refrigerant inlet, but when the refrigerant moves upward and passes through the hole 42a, the first tubular header 36 The resistance on the opposite side of the refrigerant inlet can cause more refrigerant to pass through the tube of the refrigerant inlet, so that the distribution of outlet air temperature can be made uniform.

And, as shown in Fig. 9, when the tubular header (second tubular header: 38) in which the main diaphragm 144 having the hole 144a is formed is located under the heat exchanger, the hole 144a is formed. The tubular header (first tubular header: 36) located on the upper side is gradually formed to be larger along the refrigerant advancing direction. Therefore, in the first tubular header 36, the influence of gravity is greater than the inertial force, so that the refrigerant is biased in the tube of the refrigerant inlet, but when the refrigerant moves downward to pass through the hole 144a, the second tubular header 38 The resistance is applied at the refrigerant inlet, so that more refrigerant passes through the tube opposite the refrigerant inlet, so that the distribution of the outlet air temperature can be made uniform.

According to the header type heat exchanger according to the present invention, the pressure resistance and corrosion resistance are improved, the flow of the refrigerant is smooth, the temperature distribution in the heat exchanger is uniform, and the distribution of the outlet air temperature is uniform, thereby reducing the discomfort in the rise. have.

Claims (7)

delete delete delete delete A plurality of flat tubes having a refrigerant flow path formed therein are arranged to maintain a constant distance from each other, and a corrugated fin for facilitating heat exchange is disposed between the adjacent tubes, and tubular headers are provided at both ends of the tubes. In the header type heat exchanger connected in communication, In the middle of the tubular header, a main diaphragm for dividing the inside of the tubular header into two side spaces in the width direction is installed in the longitudinal direction of the tubular header, and the main diaphragm is formed in the tubular header according to the upper and lower positions of the tubular header and the refrigerant flow path. A plurality of holes communicating the two side spaces in the width direction are formed at predetermined intervals along the longitudinal direction of the main diaphragm, When the tubular header in which the main diaphragm having the hole is disposed is located on the upper side of the heat exchanger, the hole is formed to gradually decrease in the refrigerant moving direction inside the tubular header located on the lower side. heat transmitter. A plurality of flat tubes having a refrigerant flow path formed therein are arranged to maintain a constant distance from each other, and a corrugated fin for facilitating heat exchange is disposed between the adjacent tubes, and tubular headers are provided at both ends of the tubes. In the header type heat exchanger connected in communication, In the middle of the tubular header, a main diaphragm for dividing the inside of the tubular header into two side spaces in the width direction is installed in the longitudinal direction of the tubular header, and the main diaphragm is formed in the tubular header according to the upper and lower positions of the tubular header and the refrigerant flow path. A plurality of holes communicating the two side spaces in the width direction are formed at predetermined intervals along the longitudinal direction of the main diaphragm, When the tubular header in which the main diaphragm having the hole is disposed is located at the lower side of the heat exchanger, the hole is gradually enlarged in the refrigerant traveling direction inside the tubular header located at the upper side. group. The method according to claim 5 or 6, The inside of the tubular header header heat exchanger is characterized in that the auxiliary plate for dividing the longitudinal direction of the tubular header into a plurality of spaces in accordance with the number of passes of the refrigerant.

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