JPS59150294A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent excessive heating and insufficient heating of a heat medium, by providing a path, through which high-temperature exhausting gas at a fin part directly passes the fin part, and providing a path, through which high- temperature exhausting gas that is not heat-exchanged yet is guided to the fin part by way of other paths in a heat exchanger. CONSTITUTION:High-temperature exhausted gas yielded by a burner 6 goes through a path, which is formed by a fin part 2, a heat exchanger body 1, and a tube body 4 having a bottom, and the heat exchange is performed with a pipe 3. The high-temperature exhausted gas 7, which is not heat-exchanged yet, is introduced into a heat exchange part from the intermediate part of a heat exchanger by way of paths 5 that are branched at the intermediate parts of the tube body 4. Thus the heat is not absorbed by the passage of the gas through the heat exchanger body 1 from the input side of the heat exchanger and the decrease in temperature can be prevented. Therefore almost uniform temperature distribution can be obtained as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat exchanger for equipment that heats a refrigerant such as Freon (R-22) and exchanges heat using latent heat.

Conventional configurations and their problems In general, heat exchangers have a configuration in which when the temperature is high on the inlet side, the temperature decreases as the temperature approaches the outlet side. Saturated liquid and superheated steam mix in a chaotic manner, creating an unstable heat exchange behavior.

A conventional example will be briefly explained based on FIGS. 1 and 2.

The figure is a diagram illustrating, in principle, that in a conventional heat exchanger, the temperature is high near sunrise and decreases as it approaches the exit.

In other words, near the sunrise of the heat exchanger, the heat medium generally comes in contact with high-temperature exhaust gas, so the heat medium exchanges heat and becomes high temperature, but as it approaches the rear end of the heat exchange, the high-temperature exhaust gas is heat exchanged and the heat medium decreases as thermal energy decreases. The exchange of heat to the heat medium also decreases, and the temperature of the heat medium decreases.

Purpose of the Invention The present invention provides a uniform length from the inlet side to the outlet of the high temperature exhaust side passage of a heat exchanger to prevent the heating medium from being overheated or underheated, and converts the heating medium into saturated steam near the exit of the heat exchanger. The purpose is to stabilize it in a state of 1 or a slightly supersaturated state.

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a path for the high-temperature exhaust gas of the fin portion of a heat exchanger to pass directly through the fin portion;
A plurality of passages are provided so that high-temperature exhaust gas that has not yet undergone heat exchange is introduced from other passages in the heat exchanger to the fin section and passed through, so that the heat is uniformly distributed from the inlet to the outlet of the heat exchanger. The configuration is such that the medium being exchanged does not overheat or underheat.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 to 6.

In the figure, reference numeral 1 indicates a cylindrical heat exchanger body made of a heat-resistant and good thermal conductor, and reference numeral 2 indicates a large number of fins integrally provided with the body. Reference numeral 3 denotes a pipe through which a heat medium passes, which is in close contact with the heat exchanger body 1, and is constructed so as to be continuous from the inlet to the outlet to form one passage.

Reference numeral 4 denotes a bottomed cylindrical body fitted inside, and this cylindrical body 4 is provided with a passageway 6 in the form of a slit or a plurality of holes. This passageway 6 becomes a passageway for high-temperature exhaust gas. 6 indicates the combustion flame of the burner. 7 is a high-temperature exhaust gas that passes through the fins 2 and the passageway 6.

The action will be explained below.

The high-temperature exhaust gas 7 generated from the burner 6 is transferred to the fins 2 and the heat exchanger body 1. As shown in the figure, it passes through a passage made up of a bottomed cylindrical body 4 and exchanges heat with the pipe 3. However, in general, the high temperature exhaust gas is higher at the inlet side of the heat exchanger, and as it passes through the heat exchanger body 1, heat is sequentially removed and the temperature decreases, as shown by line A in Figure 6, at the outlet. The temperature decreases as it approaches . Therefore, in this embodiment, in order to introduce the high-temperature exhaust gas 7 that has not undergone heat exchange into the fin passage 8 from the middle of the heat exchanger, the exhaust passage path 6 is branched in the middle of the bottomed cylindrical body 4. By introducing 2 into the heat exchange section, the temperature distribution becomes as shown by line B in the graph of FIG. 6, with higher areas being lower and lower areas being higher, resulting in an almost uniform temperature as a whole, and a good heat exchanger can be obtained.

Effects of the Invention When the heat exchanger of the present invention is used to heat a refrigerant such as R-22 (Freon), it can prevent local overheating and uniformly heat it, making it optimal for latent heat heating of the refrigerant. The ratio of superheated steam can be adjusted as desired, and deterioration of the refrigerant due to abnormal overheating can be prevented.

[Brief explanation of drawings]

Figures 1 and 2 are a cross-sectional view and characteristic diagram of a conventional heat exchanger,
FIG. 3 is a front sectional view of a heat exchanger showing an embodiment of the present invention, FIG. 4 is a side sectional view of the same, and FIG. 5 is a characteristic diagram of an alliance. DESCRIPTION OF SYMBOLS 1... Heat exchanger body, 2... Fin, 3... Pipe, 4... Cylindrical body, 6...
...Passage path, 8...Fin passage.

Claims (1)

[Claims] A large number of fins of an appropriate height protruding from the inner surface of a cylindrical body made of a heat-resistant and good thermal conductor are provided in the longitudinal direction, and a cylindrical heat-resistant cylinder with a bottom is fitted so as to be in contact with the tips of the fins. An exhaust passage is formed between the inner surface of the cylinder and the fins and the heat-resistant cylinder, and a heat conductive pipe through which the medium to be heat exchanged passes is closely attached to the outermost periphery to form a heat exchanger. , one end of the heat-resistant cylinder fitted inside is closed, and high-temperature exhaust gas from the other end is passed through the fin portion as a passage, and a passage is also provided in the middle of the heat-resistant cylinder, so that a part of the high-temperature exhaust gas is passed through the heat-resistant cylinder. The heat exchanger has a structure in which the high temperature exhaust gas is mixed with the high temperature exhaust gas which passes through the passage and undergoes a partial heat exchange through the fin side, thereby maintaining a high temperature state.