JPS5997490A - Heat exchanger - Google Patents

Abstract

PURPOSE:To contrive to reduce the size and enhance the performance of a heat exchanger by providing large and dense heat-transmitting surfaces to enhance heat transfer on the refrigerant side and water side, and contrive to conserve energy on a compressor and a pump by minimizing passage resistance loss in the heat exchanger on the refrigerant side and the water side. CONSTITUTION:A high-temperature refrigerant gas supplied through a refrigerant inflow port 7 flows through a plurality of refrigerant-passing holes 11 provided in outer heat-transmitting fins 4 provided in an outer cylinder 2, while water supplied through a water inflow port 5 flows through a plurality of water-passing holes 9 provided in inner heat-transmitting fins 3 provided in an inner cylinder 1, resulting in that heat is exchanged through the surfaces of the fins 3, 4 and the inner cylinder 1 as heat-transmitting surfaces, the refrigerant is condensed into a liquid, and water is heated to be hot water. In this case, since the inner and outer fins 3, 4 are densely fitted respectively to the water passage and the refrigerant passage, the heat- transmitting surfaces are high in density and large in size. Further, the holes 11 in the outer fins 4 the flow rate through which is small because of the utilization of the latent heat accompanied by the condensation of the refrigerant have a small passage resistance corresponding to the small flow rate, and therefore, the cross-sectional area of the holes 11 is set to be small. On the other hand, the flow rate through the holes 9 in the inner fins 3 is made large because of the utilization of the sensitive heat of water, the cross-sectional area of the holes 9 is set to be large to thereby reduce passage resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat exchanger between a refrigerant and water, such as an evaporator or condenser of a refrigerator.

There is a double-tube heat exchanger shown in Figure 3, a double-wall heat exchanger with water tubes and refrigerant pipes arranged side by side as shown in Figure 3, and a shell-and-tube heat exchanger (not shown). In addition to the side-by-side double wall heat exchanger shown in Fig. 3, in addition to the side-by-side double wall heat exchanger shown in Fig. 4, in cases where the heat-exchanged water is used for cold water and hot water supply, in order to prevent refrigerant and lubricating oil from mixing with hot water, There is an improved double-tube heat exchanger with two layers of inner tubes as shown. However, since the configuration of this type of conventional heat exchanger uses tube materials, it is necessary to increase the density of the heat transfer area by changing the shape of the tube materials, or to reduce the size and weight of the heat exchanger itself to save resources. It was difficult to obtain what was done.

Purpose of the Invention The present invention is intended to eliminate the above-mentioned drawbacks of the conventional technology, and to improve the size and performance of a heat exchanger by completely improving heat transfer between the refrigerant and the water side pot by configuring the heat transfer surface widely and densely. It also aims to save energy in the compressor and pump by minimizing the total resistance loss in the heat exchanger flow path of the refrigerant/water side kettle.

Structure of the Invention In order to achieve this object, the heat exchanger of the present invention is constructed of a double cylinder consisting of an inner cylinder and an outer cylinder, each of which serves as a flow path for refrigerant and water, and the inner and outer surfaces of the inner cylinder are A heat transfer fin with a large number of flow holes arranged in the coolant flow path side is provided, and the flow hole surface axis of the heat transfer fin on the coolant flow path side is aligned with the water flow direction. A: It is smaller than the area of the flow holes of the roadside heat transfer fins.

This (11G configuration) allows the heat transfer surface to be configured widely and densely in both the refrigerant and water side flow paths, unlike conventional heat exchangers using tube materials. The area of the flow holes arranged in the heat fins can be used to fully utilize the latent heat generated by state changes, reducing the flow resistance within the heat exchanger where the flow rate is low, resulting in energy savings for compressors and pumps that are used as refrigerant/water circulation power. It has the effect of obtaining

DESCRIPTION OF EMBODIMENTS Hereinafter, one embodiment of the present invention will be described in the first embodiment. Second. This will be explained using FIG. FIG. 1 is a sectional view of the overall configuration, FIG. 2 is a configuration diagram of inner heat transfer fins, and FIG. 3 is a configuration diagram of outer heat transfer fins. Note that the same members are given the same numbers. In the figure, 1 is an inner cylinder, 2 is an outer cylinder, 3 is an inner heat transfer fin provided on the inner surface of the inner cylinder 1, 4 is an outer heat transfer fin provided on the outer surface of the inner cylinder 1,
5 is a water inlet to the inner cylinder 1, 6 is a water outlet from the inner cylinder 1,
7 is a refrigerant inlet into the outer cylinder 2, and 8 is a refrigerant outlet from the outer cylinder 2. In addition, in the inner heat transfer fin 3 in FIG. 2, 9
1 is a large number of water flow holes, 1o is a mounting contact part to the inner surface of the inner cylinder 1, and in the outer heat transfer fin 4 shown in FIG. This is the mounting contact part. The feature of the present invention in the above structure is that it is composed of a double cylinder, an inner cylinder 1 and an outer cylinder 2, and each of the cylinders is used as a flow path for refrigerant and water, and the inner and outer surfaces of the inner cylinder 1 are many)
Heat transfer fins 3.4 having flow holes 9 and 1o are provided, and the area of the flow holes 11 of the heat transfer fins 4 on the coolant flow path side is made smaller than the area of the flow holes 9 of the heat transfer fins 3 on the water flow path side. There is a particular thing.

Hereinafter, the operation of the heat exchanger according to the present invention will be explained in the case where it is used as a condenser of a refrigerator. High-temperature refrigerant gas from the refrigerant inflow lower flows through a large number of refrigerant flow holes 11 provided in the outer heat transfer fins 4 in the outer cylinder 2, while water from the water flow port 6 flows through the inner heat transfer fins in the inner cylinder 1. Heat is exchanged through a large number of water flow holes 9 provided in the tube 3 using the inner and outer heat transfer fins 3 and 4 and the wall surface of the inner tube 1 as heat transfer surfaces, and the refrigerant is condensed and liquefied while the water is heated. The water will cool down and become warm. At this time, since the inner and outer heat transfer fins 3.4 are closely attached to the water and refrigerant flow paths, heat exchange is promoted by having a high density and wide heat transfer surface. It has been effective.

Furthermore, the large number of flow holes 11 of the outer heat transfer fins 4, which have a small flow rate by utilizing the latent heat accompanying the condensation of the refrigerant, have a small flow resistance depending on the flow rate, so the area is small. As for the refrigerant, the flow rate increases by utilizing the sensible heat of water, so the area of the numerous flow holes 90 of the inner heat transfer fins 3 is increased to reduce flow resistance.

By preventing an increase in flow resistance according to each flow rate on the water side, it has the effect of saving energy without increasing the load on the compressor on the refrigerant side or the pump on the water side. be.

Effects of the Invention According to the heat exchanger of the present invention as described above, the following effects can be obtained.

■ It is composed of a double cylinder, an inner cylinder and an outer cylinder, each of which serves as a flow path for water and refrigerant, and heat transfer fins with a large number of circulation holes are provided on the inner and outer surfaces of the inner cylinder. By closely attaching the heat transfer fins on both the inner and outer sides, the heat transfer surfaces on both the water and refrigerant sides are constructed with high density and wide, and the heat exchange performance can be improved.

■ Also, the area of the flow holes of the heat transfer fins on the coolant flow path side is made smaller than the area of the flow holes of the heat transfer fins on the water flow path side, increasing the flow resistance according to the difference in the flow rate of the refrigerant due to the use of latent heat and the flow rate on the water flow due to the use of sensible heat. The heat exchanger is made of cylinder material that makes up the OC flow path and plate material that makes up the heat transfer fins. Therefore, unlike the conventional case of using pipe materials, it is easy to reduce the weight and size, and along with this, it also has additional effects such as easy installation into equipment.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the overall structure of a heat exchanger according to the present invention, and FIG.
FIG. 3 is a block diagram of the inner heat transfer fin, FIG. 3 is a block diagram of the outer heat transfer fin, and FIGS. 4, 6, 6, and 7 are block diagrams of a conventional heat exchanger. 1... Inner cylinder, 2... Outer cylinder, 3...
...Inner heat transfer fin, 4...Outer heat transfer fin,
9...Inner heat transfer fin circulation hole, 1o...
...Flower holes in the outer heat transfer fins. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 4 Figure 7

Claims (1)

[Claims] It is composed of a double cylinder consisting of an inner cylinder and an outer cylinder, and this cylinder serves as a flow path for all the refrigerant and water, and heat transfer fins with a large number of circulation holes are provided on the inner and outer surfaces of the inner cylinder, and the refrigerant flow path side A heat exchanger in which the area of the flow holes of the heat transfer fins is smaller than the area of the flow holes of the heat transfer fins on the water flow path side.