JPS59191894A - Heat exchanger - Google Patents

Abstract

PURPOSE:To improve the heat transferring ability of a condenser by promoting separation of liquid from vapor in a header, by providing a gas/liquid separating device in the neighborhood of the outlet of heat transfer tubes for heating medium, in a heat exchanger having many heat transfer tubes and a pair of headers which connect both ends of the heat transfer tubes, installed in an equipment such as an air-conditioner. CONSTITUTION:Headers 2 and 3 are connected to both ends of heat transfer tubes, and a partition pannel 4 is provided in each header 2 and 3. The horizontal sections of the headers 2 and 3 are semicircular and the heat transfer tubes 1 are protruded into the headers slipping off the center positions of them. The mixed flow of vapor and liquid being fed into the headers 2 and 3 from heat transfer tubes 1 rotates along the curved inner walls 2a and 3a of the headers 2 and 3, respectively, so that the vapor and the liquid adhering to the inner walls 2a and 3a are completely separated from each other by the centrifugal force. The liquid drips along the inner walls 2a and 3a, while the vapor flows through the inside of the headers 2 and 3, accordingly the vapor only is fed into the heat transfer tubes 1 on the lower stage. The liquid gathered in the lower part of a header 2 is fed into the headers 2 and 3 on the lower stage, passing through a gap 4a which is provided between the partition pannel 4 and the inner wall of a header 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to a large number of heat transfer tubes such as air conditioners, binary cycle machines, and power generation plants.
This invention relates to a heat exchanger, in particular, to a header structure of a heat exchanger in which heat medium vapor is condensed in a heat transfer chamber, which consists of headers connected to each side of the li side.

In conventional heat exchangers of this type, the horizontal cross section of the header is circular or semicircular, and the heat transfer tubes are disposed at the center of the horizontal cross section. However, in this structure, the heat medium, condensed liquid, and uncondensed steam flowing into the header from the heat transfer tubes are not sufficiently separated in the header, and some of the liquid mixes with the steam and flows into the heat transfer tubes in the lower stage. There was a drawback that the inflow, heat transfer, and thermal performance deteriorated.

The purpose of the present invention is to promote separation of liquid and vapor in the header,
It is an object of the present invention to provide a heat exchanger having a header structure such that only steam flows into the lower stage heat exchanger tubes.

In order to achieve the above object, the present invention provides a header with a structure that applies centrifugal force to the heating medium flow of the gas-liquid mixed flow, and utilizes the centrifugal force of the heating medium flow to fully promote gas-liquid separation within the header. It is characterized by

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Headers 2.3 are connected to both ends of a large number of heat exchanger tubes 1 arranged in parallel. A partition plate 4 is provided within the header 2.3. FIG. 2 shows a horizontal sectional view of these headers 2, 3. The horizontal cross-sectional shape of the headers 2 and 3 is semicircular, and the heat exchanger tube 1 protrudes from the center position. According to this embodiment, the mixed flow of steam and liquid flowing from the heat exchanger tube 1 into the headers 2 and 3 flows through the curved inner wall of the header 2.3.
Since the header 2.3 rotates along the a and 3a, the liquid adheres to the inner walls 2a and 3a of the header 2.3 due to centrifugal force, and the vapor and liquid are completely separated. The liquid is %2a+3a'f in header 2.3
: The steam is transmitted and flows down, and since it does not flow inside the header 2.3, only the steam flows into the lower heat transfer tube.

Liquid reservoir at the bottom of header 2, partition plate 4 inside header 2
It flows through the hole 4af in the lower header.

According to the present embodiment 91, the liquid and steam in the header are sufficiently separated, so that the problem of liquid flowing into the heat transfer tubes and deteriorating heat transfer performance is solved.

Other embodiments of the header structure are shown in FIGS. 3 to 7. Third
The figure shows a horizontal section of the headers 2 and 3 of a cedar-shaped 755 cylinder. FIG. 4 shows the curved inner wall of the header 2 and the outlet end 1a of the heat exchanger tube by bending the outlet end 1a of the heat exchanger tube 1 that is desired to be inside the header 2.
This is the case when liquid and vapor are separated by

FIG. 5 shows a case where a curved guide 5 is provided in the header 2 to separate liquid and steam.

FIG. 6 shows a case where the heat exchanger tube 1 is made to protrude close to the curved inner wall 2a of the metal pender 2, and liquid and steam are separated at the curved inner wall 2a of the header 2.

FIG. 7 shows a case where a cylinder 6 is provided near the outlet of the heat exchanger tube 1 in the header 2, and liquid and steam are separated on the surface of the cylinder 60.

In both Figures 3 to 7, the effect of colliding the heat medium flow against the cylindrical wall surface is that the centrifugal force of the heat medium flow sufficiently separates the liquid and steam inside the header, promoting heat transfer performance. It's the same.

According to the present invention, separation of liquid and steam in the header is promoted,
Since only steam flows into the lower heat transfer tube, the heat transfer performance of the condenser is improved and the condenser can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a sectional view illustrating an embodiment of the heat exchanger of the present invention, FIG. 2 is a horizontal sectional view of the header in FIG. 1, and FIGS. FIG. 2 is a horizontal cross-sectional view showing an example. DESCRIPTION OF SYMBOLS 1... Heat exchanger tube, 2, 3... Header, 4... Partition plate in header, 5... Curved surface guide, 6... Cylinder. Animal 1 day Kaya 7 days

Claims (1)

[Claims] In a heat exchanger that has a large number of heat transfer tubes arranged in parallel and a header that connects both ends of these heat transfer tubes, and condenses heat medium vapor within a heat transfer sound, a heat medium outlet in the header before heat transfer is provided. A heat exchanger characterized in that a gas-liquid separation mechanism is configured nearby.