JPH01181090A - Heat exchanger - Google Patents

Abstract

PURPOSE:To make fluid to flow smoothly from the outflow port of the fluid into the deep part of an inlet tank and distribute it uniformly to respective tubes, by a method wherein a choke, choking the flow passage of the fluid in the bending direction of the flow passage, is formed between the bent part and the fluid outflow port of a substantially chevron-shaped inlet pipe connected to the inlet tank. CONSTITUTION:An inlet pipe 130 is provided with a first oval recess and a second oval recess in parallel while the first recess is provided with a fluid outflow port 131 opened toward a tank part to introduce refrigerant into the tank part. The second recess is provided with a communicating hole 133 commu nicating between tank parts. A flow passage 132, communicating with the first recess, is bent at a right angle substantially by bending the inlet pipe 130 so as to show a chevron shape at a bent part 130a. A choke 140, choking the flow passage 132 in the bent direction of the flow passage, is provided to chock refrigerant, flowing through the flow passage 132, in an arrow sign direction toward the fluid outflow port 131. As a result, the refrigerant flows out of the fluid outflow port 131 smoothly without generating any whirling stream.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat exchanger, which can be used, for example, as an evaporator in a refrigeration cycle.

(Technical Background) The present inventors previously proposed a heat exchanger as shown in FIG. 2 in Japanese Patent Application No. 62-255250.

The heat exchanger shown in Fig. 2 is the Utility Model Publication No. 53-3237
As shown in Publication No. 8, a unit 110 is formed by facing a pair of plates having a 0-shaped groove and tank recesses at both ends of the 0-shaped groove, and a multi-stage laminate with this unit 110 is formed. . By stacking the plurality of units 110, a plurality of U-shaped tubes 112 and tank portions 120a to 120d are formed at both ends' of the tubes 112. Between each tube 112, a corrugated gate is formed. Fins 114 are arranged.

The tank parts 120a to 120b have a substantially cylindrical shape,
An inlet pipe 130 for introducing a refrigerant into the tank portion 20a is disposed at one end of the tank portion 120a.

This inlet pipe 130 has a dogleg-shaped flow path 132 that is bent at a substantially right angle, and a fluid outlet 131 that opens toward the axial direction of the tank portion 120a is opened on the side of this flow path 132. .

In the heat exchanger shown in FIG.
It flows into the tank part 120b, flows into the tank part 120C arranged coaxially with the tank part 120b, and flows out from the outlet pipe 145 via the tube 112 and the tank part 120d.

[Problem to be solved by the invention]

However, in the heat exchanger 100 having the above-mentioned inlet pipe 130, the refrigerant flowing inside the inlet pipe 130 is bent at the bending part 130a as shown in FIG. As a result, the refrigerant flowing into the tank portion 20a from the fluid outlet 131 flows into the tank portion 20a as shown in FIG.
In this case, the air temperature after passing through the heat exchanger 100 is not uniformly distributed to each tube 112, but is distributed biased to the tubes near the fluid outlet 131. The farther the tube passes from the inlet of the section 120a, the less sufficient heat exchange occurs, which causes a decline in performance.

Reference numeral 121 in FIG. 4 indicates the tank portion 120a and each tube 1.
This is a communication hole that communicates with 12.

[Means to solve the problem]

Therefore, in the present invention, at a position between the bent part of the approximately dogleg-shaped inlet pipe connected to the inlet tank part and the fluid outlet,
A constriction part was formed to constrict the flow path in the bending direction.

[Action and effect]

As a result, the fluid bent at the bending portion is contracted by the constriction portion, and the flow is directed toward the fluid outlet. As a result, the fluid does not form a swirling flow as in the conventional case, so it can flow well from the fluid outlet to the inner part of the inlet tank, and is evenly distributed to each tube.

〔Example〕

Next, an example in which the present invention is used as an evaporator in a refrigeration cycle will be described.

The heat exchanger 100 as a whole is as shown in FIG. 2 and is as described above. However, the inlet tank defined in the present invention corresponds to the tank section 120a, and the outlet tank corresponds to the tank section 120b.

FIG. 1 shows an inlet pipe 130 used in this embodiment.
b, elliptical second N groove 14 along the cross-sectional shape of 120c
2 in parallel.

The first recess 141 opens toward the tank portion 120a,
A fluid outlet 131 is provided for introducing the refrigerant into the tank portion 20a. The second depression 142 has a communication hole 133 that communicates the tank portion 120b and the tank portion 120C.
is provided.

The flow path 132 communicating with the first depression 141 is connected to the inlet pipe 1
30 is bent into a substantially doglegged shape at the bending portion 130a, so that it is bent at a nearly right angle. A flow path 1 is provided between the bent portion 130a and the fluid outlet 131.
A constriction part 140 is formed to narrow the flow path 32 in the bending direction of the flow path, and the refrigerant flowing inside the flow path 132 contracts toward the fluid outlet 131, as shown by an arrow R in the figure. As a result, the refrigerant flows smoothly through the fluid outlet 131 without forming a swirling flow.
More leakage.

FIG. 1 is a sectional view taken along the center line of the inlet pipe 130, and the inlet pipe 130 is formed by placing a pair of plates shown in this figure facing each other and joining the hatched portions in the figure.

However, the first recess 14 of the other facing plate
1 has no fluid outlet 131 formed therein.

FIGS. 6 and 7 show measured outlet air temperatures of the evaporator using the conventional inlet pipe shown in FIG. 3 and the evaporator of this embodiment. The horizontal axis shows the position in the width direction of the evaporator, and the vertical axis shows the air temperature. Further, in FIGS. 6 and 7, A indicates the outlet air temperature at the upper end of the evaporator, B indicates the outlet air temperature at the middle section, and C indicates the outlet air temperature at the lower end.

As can be seen from these figures, in the conventional evaporator, there are large temperature differences at the top, middle, and bottom ends, as well as in the width direction, whereas in this embodiment, these temperature differences are large. It has been reduced.

In the inlet pipe 130 shown in FIG.
Although it is a simple opening, a cylindrical nozzle 135 may be formed around the fluid outlet 131 to protrude into the tank portion 20a, as shown in FIG. This nozzle 13
5 allows the refrigerant to be jetted further away from the tank portion 120a. Further, the plate forming the inlet pipe is formed by press molding.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an inlet pipe according to an embodiment of the present invention, Fig. 2 is a perspective view of an evaporator, Fig. 3 is a sectional view of a conventional inlet pipe, and Fig. 4 is a sectional view showing the operation of a conventional inlet pipe. , FIG. 5 is a diagram showing the outlet air temperature of the conventional example, FIGS. 6 and 7 are diagrams showing the outlet air temperature of the conventional example and the embodiment of the present invention, and FIG.
The figure is a sectional view showing another embodiment of the inlet pipe. 112...Cheap, 114...Fin, 120a
~120d...Tank part, 130...Inlet pipe,
131...Fluid outflow 0.140...Constriction part.

Claims (1)

[Scope of Claims] A cylindrical inlet tank, a plurality of tubes having one end connected to the inlet tank, and a cylindrical outlet tank having the other end connected to the tube, the inlet tank comprising: An inlet pipe for introducing the fluid to be heat exchanged into the inlet tank is connected to one end side, and this inlet pipe has a flow path bent in a substantially dogleg shape, and a side portion of the flow path that is connected to the A heat exchanger having a fluid outlet opening in the axial direction of an inlet tank, and a constriction part that is located between a bending part of the flow path and the fluid outlet and narrowing the flow path in the bending direction of the flow path. .