JPS59112189A - Heat exchanger - Google Patents

Abstract

PURPOSE:To enhance coefficient of heat transfer and contrive to reduce the size and enhance the performance of a heat exchanger, by a method wherein the interior of a double cylinder consisting of an inner cylinder and an outer cylinder is made to be a passage for a heat-exchanging medium, and heat-transmitting fins provided with a plurality of passing holes locally distributed in proximity to the inside and outside surfaces of the inner cylinder are provided. CONSTITUTION:A high-temperature refrigerant gas fed through a refrigerant inflow port 8 flows through the passing holes 12 of outside heat-transmitting fins 5 provided in the outer cylinder 2, while water fed through a water inflow port 7 flows through passing holes 10 of inside heat-transmitting fins provided in the inner cylinder 1 while exchanging heat with the fins 4, 5 and wall surfaces of the 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 passing holes 10, 12 are locally distributed in proximity to the inside and ouside surfaces the inner cylinder 1, stagnation of the refrigerant and adhesion of a lubricating oil in proximity to contact parts 13 of the fins 5 are prevented on the refrigerant passage side, while stagnation of water in proximity to contact parts 11 of the fins 4 is eliminated and water is stirred to form turbulent flows on the water passage side, and the coefficient of heat transfer is enhanced.

Description

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

(Conventional structure and its problems) Conventionally, this type of heat exchanger has been a double pipe heat exchanger as shown in Figs. 4 and 5, and a double pipe heat exchanger as shown in Fig. 6. There is a double wall heat exchanger as well as a shell and tube heat exchanger (not shown). Furthermore, in systems where heat-exchanged water is used for cold water and hot water supply, in addition to the side-by-side double wall heat exchanger shown in Fig. 6, in addition to the parallel double-wall heat exchanger shown in Fig. 7, in order to prevent the mixing of refrigerant and lubricating oil with hot water, There is an improved double-tube heat exchanger with a double-walled inner tube, as shown in the figure below. However, since the structure of this type of conventional heat exchanger uses pipe materials as a component, it is necessary to make the heat transfer area high density in the shape of the pipe material, and to reduce the size and weight of the heat exchanger itself. It was difficult to obtain recycled materials.

(Object of the invention) The present invention eliminates the above-mentioned conventional drawbacks, and
The purpose is to make the heat exchanger compact and high-performance by configuring the heat transfer surface widely and densely and improving the heat transfer coefficient.

(Structure of the Invention) In order to achieve this object, the heat exchanger of the present invention is composed of a double cylinder including an inner cylinder and an outer cylinder, the inside of the cylinder is used as a flow path for the heat exchange medium pots, and the inner cylinder Heat transfer fins having a large number of communication holes are provided on the inner and outer surfaces of the inner cylinder, and the communication holes are unevenly distributed near the inner and outer surfaces of both the inner and outer heat transfer fins.

With this configuration, in each of the heat exchange medium flow paths, the heat transfer surface can be configured widely and densely, unlike in conventional heat exchangers using tube materials. By unevenly distributing the heat transfer fins in the vicinity, the heat transfer fins prevent the stagnation of the nearby fluid, promote the stirring turbulent flow effect, and improve the heat transfer coefficient, making it possible to achieve smaller size and higher performance. be.

(Description of Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. FIG. 1 is a sectional view of the overall configuration, FIG. 2 is an inner heat transfer fin, and FIG. 3 is an outer heat transfer fin. 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 a flow path guide tube, 4 is an inner heat transfer fin provided on the inner surface of the inner cylinder 1, 5 is an outer heat transfer fin provided on the outer surface of the inner cylinder 1, and 6 is an outer heat transfer fin provided on the outer surface of the inner cylinder 1. 7 is a water inlet into the inner cylinder 1, 7 is also an outlet, 8 is a refrigerant inlet into the outer cylinder 2, and 9 is a refrigerant outlet. In the inner heat transfer fin 4 in FIG. 2, 10 is a large number of water flow holes, 11 is an attachment contact portion to the inner surface of the inner cylinder 1, and in the outer heat transfer fin 5 in FIG.
1 is a large number of refrigerant flow holes, and 13 is an attachment contact portion to the outer surface of the inner cylinder 1. The feature of the present invention in the above structure is that it is composed of a double cylinder of an inner cylinder 1 and an outer cylinder 2, and the inside of the cylinder is used as a flow path for refrigerant and water, respectively, and a large number of A heat transfer fin 4/4°5 having communication holes 10 and 12 is provided, and the communication holes 10 and 12 are connected to the inner and outer heat transfer fins 4.
, 5 are constructed with a biased distribution near the inner and outer surfaces of the inner cylinder 1.

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 inlet 8 flows through a large number of flow holes 12 arranged on the outer heat transfer fins 5 in the outer cylinder 2, while water from the water flow port 6 flows through the inner cylinder 1.
While flowing through a large number of circulation holes 10 arranged in the inner heat transfer fins 4, the refrigerant exchanges heat with the inner and outer heat transfer fins 4 and 5 and the wall surface of the inner cylinder 1 as a heat transfer surface, and the refrigerant is condensed and liquefied. It is heated and becomes hot water. At this time, since the inner and outer heat transfer fins 4 and 5 are closely attached to the water and refrigerant flow paths, the heat transfer surface is configured to be dense and wide, thereby promoting heat exchange.

Further, both the communication holes 10° 12 of the inner and outer heat transfer fins 4 and 5 are connected to the inner and outer surfaces of the inner cylinder 1 at the fin attachment contact portions 11. ．． 13
Since it is unevenly distributed near the refrigerant flow path side, it prevents refrigerant stagnation and lubricating oil adhesion near the attachment contact portion 13 of the outer heat transfer fiber 15 to improve the heat transfer coefficient, and also improves the heat transfer coefficient near the water flow path side. This has the effect of removing stagnation of water in the vicinity of the attachment contact portion 11 of the inner heat transfer fin 4, and similarly improving the heat transfer coefficient due to the turbulent agitation action, thereby enhancing the heat exchange performance.

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

(2) It is composed of a double cylinder consisting of an inner cylinder and an outer cylinder, and the inside of the cylinder is used as a flow path for each heat exchange medium, and the heat transfer fins having a large number of circulation holes arranged on the inner and outer surfaces of the inner cylinder are blocked, and the The circulation holes are unevenly distributed near the inner and outer surfaces of the inner cylinder for both the inner and outer heat transfer fins, which increases the heat transfer area, prevents fluid stagnation on each heat medium flow path side, and reduces heat due to turbulent agitation. The effect of improving the transfer rate promotes heat exchange and improves performance.

■ Since the tube material and heat transfer fins are the structure of the heat exchanger made of metal plates, by shaping the heat transfer surface with high density, it is possible to obtain a light and compact heat exchanger that saves materials.

(2) Moreover, the heat exchanger of the present invention has the additional effect that it can be made lighter and more compact than conventional tube materials, making it easier to incorporate it into equipment.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional overall configuration diagram of a heat exchanger according to the present invention, FIG. 2 is a configuration diagram of inner heat transfer fins, FIG. 3 is a configuration diagram of outer heat transfer fins, and FIGS. 6 and 7 are diagrams showing conventional heat exchangers. 1... Inner cylinder, 2... Outer cylinder, 4... Inner heat transfer fin,
5... Outer heat transfer fin, 10... Communication hole of inner heat transfer fin, 11... Communication hole of outer heat transfer fin. Figure 1 Figure 2 Figure 3 Figure 4 Figure 519 Figure 6 and Figure 7

Claims (1)

[Claims] It is composed of a double cylinder consisting of an inner cylinder and an outer cylinder, the inside of the cylinder is used as a flow path for the heat exchange medium pots, heat transfer fins with a large number of circulation holes are provided on the inner and outer surfaces of the inner cylinder, and the circulation holes are A heat exchanger characterized in that the heat exchanger is unevenly distributed near the inner and outer surfaces of the inner cylinder.