JPH04309791A - Heat exchanger with fin - Google Patents

Abstract

PURPOSE:To prevent scattering of condensed water to a fan and the circumference, and to prevent damage of the fan, etc., due to icing by collecting the water to be passed through a heat exchanger. CONSTITUTION:A heat exchanger has plate type fins 10 in which many fin plates 1 are arranged in parallel at a predetermined interval and air streams flow through gaps of the plates 1, and heat transfer tubes 1 which are passed perpendicularly to the films 10. Then, superheated vapor or high temperature refrigerant flows to heat transfer tubes 6 disposed at the edge 10A of the gas flow-out side of the fins 10.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger with fins used in heat pump type air conditioning equipment, freezing/refrigeration equipment, etc.

0002

2. Description of the Related Art When heat pump type air conditioning equipment is used for heating in the winter or when refrigeration equipment is operated, frost forms on the heat transfer surface of a heat exchanger that operates as an evaporator. When frost forms on the heat transfer surface in this way,
The pressure loss of the airflow flowing over the heat transfer surface increases, reducing the gas flow rate, and the frost layer increases the heat transfer resistance of the heat transfer surface, resulting in a decrease in heat transfer performance. Therefore, for example,
As in the heat exchanger described in JP-A No. 63-38890, the heat transfer surface is treated to prevent an increase in pressure loss in the air passage due to frost formation and an increase in heat transfer resistance due to a frost layer. It is known that this was done.

As shown in FIG. 6, the heat exchanger described in the above publication includes plate-like fins 1 arranged at regular intervals and through which air flows, and a heat exchanger inserted at right angles through the plate-like fins 1. The plate-like fin 1 is made of a pre-coated fin material having a hydrophilic surface layer 3 on one surface and a water-repellent surface layer 4 on the other surface, and as shown by the arrow in FIG. It was made to flow. When the heat exchanger is operated as an outdoor heat exchanger for air conditioning equipment during heating in winter, or as a cooler for freezing and refrigeration equipment, condensed water may freeze and turn into frost on the water-repellent surface layer 4. Since it is possible to extend the time until the water droplets form and retain them as water droplets for a certain period of time, frost formation can be prevented. Furthermore, during defrosting, the hydrophilic surface layer 3 of the adjacent plate-like fins 1 attracts water droplets remaining on the water-repellent surface layer 4, thereby making it easier for the water droplets on the water-repellent surface layer 4 to fall. Therefore, even when the operating temperature of this heat exchanger is low, frost formation is unlikely to occur, and increases in pressure loss and heat transfer resistance due to frost formation can be suppressed. Further, it is possible to reduce the amount of water droplets remaining after defrosting, and it is also possible to prevent problems such as the remaining water droplets freezing immediately after returning to heating operation and increasing pressure loss.

0004

However, although the conventional heat exchanger described above seems to be effective against condensed water or defrost water generated on the surface of the plate-shaped fins 1,
No measures have been taken to prevent condensed water from passing through the heat exchanger without adhering to it.
When the evaporation temperature decreases and condensed water is generated on the surface of the plate-like fins 1, no frost will form on the water-repellent surface layer 4 for a certain period of time from the start of heating operation, and all of the condensed water that has become water droplets will flow onto the plate. It is not retained by the plate-shaped fins 1, and a part of it passes through the heat exchanger as mist or water droplets without being retained by the plate-shaped fins 1. In such a state, the evaporation temperature of the heat exchanger decreases. When the temperature drops below the freezing point, condensed water that has passed through the heat exchanger adheres to fans, grills, etc. and forms ice. Therefore, for example, there is a risk that the rotation of the fan may become unbalanced or that the fan may be damaged, which poses a problem in that these problems may impede the operating condition.

The present invention was made to solve the above problems, and by collecting the condensed water that passes through the heat exchanger, it prevents the condensed water from scattering to the fan and the surroundings. Moreover, it is an object of the present invention to provide a heat exchanger with fins that can prevent damage to the fan or the like due to ice buildup on the fan or the like.

[0006]

[Means for Solving the Problems] The heat exchanger of the present invention includes a plate-shaped fin in which a large number of fin plates are arranged in parallel at predetermined intervals, and gas flows through the gaps between the fin plates; In a finned heat exchanger equipped with heat transfer tubes penetrating perpendicularly to the plate-shaped fins, superheated steam or high-temperature refrigerant is allowed to flow through the heat transfer tubes located at the gas outlet side edges of the plate-shaped fins. This is what I did.

[0007]

[Operation] According to the present invention, when the evaporation temperature of the heat exchanger decreases during use or the temperature decreases below the dew point of the air,
When gas containing condensed water flows through the gaps between the plate-shaped fins and attempts to flow out from the edge of the plate-shaped fins,
This edge is heated by superheated steam or high-temperature refrigerant flowing through the heat transfer tube to prevent icing on this edge and collect it as condensed water, and the condensed water flowing out from the edge flows out. can be prevented.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in FIGS. 1 to 5, with the same reference numerals assigned to parts that are the same as or corresponding to the conventional ones. Note that FIG. 1 is a side view showing essential parts of one embodiment of the finned heat exchanger of the present invention, FIG. 2 is a view corresponding to FIG. 1 showing another embodiment of the finned heat exchanger of the present invention, and FIG. -FIG. 5 are plan views showing still other embodiments of the finned heat exchanger of the present invention.

As shown in FIG. 1, the finned heat exchanger of this embodiment has a large number of fin plates 1 arranged in parallel at predetermined intervals, and gas flows in the direction of the arrow through the gaps between the fin plates 1. The heat exchanger includes a plate-shaped fin 10 and a plurality of heat transfer tubes 2 passing through the plate-shaped fin 10 at right angles, and a fan 5 for generating an airflow is installed on the gas outflow side of the heat exchanger. is installed. Furthermore, the finned heat exchanger of this embodiment has the following features:
It is configured so that superheated steam or high-temperature refrigerant flows through heat transfer tubes 6 shown by diagonal lines.

[0010] As described above, the edge portion 10 on the side from which the gas flows out
This end edge 10A is heated by flowing superheated steam or high temperature refrigerant through the heat transfer tube 6 located at A, thereby heating the end edge 10A.
Since the condensed water can be collected at this edge 10A without causing frost formation on the fan 5, the condensed water is prevented from scattering to the fan 5 and its surroundings, and the condensed water is prevented from adhering to the fan 5. Ice formation can be prevented, and damage to the fan 5 etc. due to ice buildup on the fan 5 etc. can be prevented.

Further, in a heat exchanger with fins according to another embodiment of the present invention, as shown in FIG.
The heat exchanger is constructed in the same manner as the heat exchanger of the above embodiment except that the surface of the heat exchanger is provided with a hydrophilic treatment portion 1B. Therefore,
According to the heat exchanger of this embodiment, the hydrophilic treatment section 10B makes it easier to collect condensed water.

Furthermore, a heat exchanger with fins according to another embodiment of the present invention has plate-shaped fins 1 as shown in FIG.
The gas outflow side end edge 1A of each fin plate 1 constituting the gas outflow side of 0 is formed in a wave shape, and the end edge 10A of the plate-shaped fin 10 as a whole is also formed in a wave shape. All of the heat exchangers are constructed in the same way as the heat exchanger of the first embodiment. Furthermore, the plate-shaped fins 10 may not be formed in a wave shape as a whole, but may be formed in a groove shape as shown in FIG. Therefore, according to the heat exchanger of each of these embodiments, gas collides more easily at the edge portion 10A, making it easier to collect condensed water than in the case of the heat exchanger of the first embodiment.

Furthermore, a heat exchanger with fins according to another embodiment of the present invention is provided, as shown in FIG. The structure is similar to that of the above embodiment, except that a hydrophilic treatment portion 1B is provided on one surface of the side wave-shaped edge portion 1A, and a water repellent treatment portion 1C is provided on the other surface. There is. By applying the hydrophilic treatment portion 1B to the edge portion 1A in this manner, the water film on this surface becomes thinner, expanding the gas flow path and suppressing an increase in pressure loss, and also improving water repellency. By applying the treatment portion 1C, it is possible to promote the falling of water droplets on this surface and improve drainage efficiency. Of course, the same effect can be expected even if these hydrophilic treatments and water repellent treatments are applied to the groove-shaped end portion 1A.

The heat exchanger with fins of the present invention is not limited to the above-mentioned embodiments, but superheated steam or high-temperature refrigerant is inserted into the heat transfer tube located at the edge of the gas outlet side of the plate-shaped fin. All of them are included in the present invention as long as they are made to flow or have the edge portions formed in a wavy or grooved shape.

[0015]

[Effects of the Invention] According to the present invention, by collecting the condensed water that is about to pass through the heat exchanger, it is possible to prevent the condensed water from scattering to the fan and the surrounding area, and to prevent icing on the fan. It is possible to provide a finned heat exchanger that can prevent damage to the fan or the like caused by the heat exchanger.

[Brief explanation of drawings]

FIG. 1 is a side view showing essential parts of an embodiment of a finned heat exchanger of the present invention.

FIG. 2 is a view corresponding to FIG. 1 showing another embodiment of the finned heat exchanger of the present invention.

FIG. 3 is a plan view showing still another embodiment of the finned heat exchanger of the present invention.

FIG. 4 is a view corresponding to FIG. 3 showing still another embodiment of the finned heat exchanger of the present invention.

FIG. 5 is a view corresponding to FIG. 3 showing still another embodiment of the finned heat exchanger of the present invention.

FIG. 6 is a plan view showing the main parts of a conventional finned heat exchanger.

7 is an enlarged side view showing the lower part of the fins of the finned heat exchanger shown in FIG. 6; FIG.

[Explanation of symbols]

1 Fin plate 1A Edge portion 2 Heat exchanger tube 6 Heat exchanger tube 10 through which superheated steam or high temperature refrigerant flows Plate-shaped fin 10A Edge portion

Claims (2)

[Claims] 1. A plate-shaped fin in which a large number of fin plates are arranged in parallel at predetermined intervals and gas flows through the gaps between the fin plates, and a heat transfer tube that penetrates the plate-shaped fin at right angles. A finned heat exchanger characterized in that superheated steam or high-temperature refrigerant flows through heat transfer tubes located at the gas outflow side edges of the plate-shaped fins. 2. The finned heat exchanger according to claim 1, wherein the end edge portion is formed in a wave shape or a groove shape.