JPS6122196A - Turbulent flow promoter for heat exchanger - Google Patents

Abstract

PURPOSE:To reduce the ratio of a non-turbulence flow area and to enhance the turbulent flow effect within a fluid conducting part so as to increase the heat- exchange ability without increasing an intertubular pressure loss by inclining a corrugated part imparting a turbulent flow effect to a fluid in a strip member short sided direction. CONSTITUTION:The promotor 1 is formed by subjecting a strip member of a suitable length to press working. In the promoter 1, a pair of corrugated parts 2 and 2' parallel to the longitudinal direction thereof are connected via flat connecting parts 3. The adjucent corrugated parts 2 and 2' of the turbulent flow promoter 1 are expanded in mutually opposite directions so that the bottom portion 2'b of one corrugated part 2 is located at the top portion 2a of the other corrugated part 2. Furthermore, the corrugated parts 2 and 2' are inclined in the short side direction of the strip-shaped plate so as to enhance the turbulent flow effect at the right and left parts of the turbulent flow promotor 1. Therefore, the ratio of the non-turbulent flow region is reduced, the turbulent flow effect within the fluid communicating tube is increased and the intertubular heat transfer capacity and the heat exchange ability on the fluid are improved without increasing the intertubular pressure loss.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a turbulence promoter that is inserted into a fluid conduit constituting a heat exchanger such as an oil cooler or heater core to create a turbulent flow effect in the fluid. It is.

Structure of the conventional example and its problems The turbulence promoter used in the conventional heat exchanger has slits parallel to the longitudinal direction of the strip plate at predetermined intervals in the center of the longitudinal direction, as shown in Fig. 7. A pair of wave-shaped parts 10, 10
', and the wave-shaped parts 10°10' are connected by a connecting part 11, and the top part 10 of one of the adjacent wave-shaped parts 10
It is formed so as to be located at the bottom part 10'b of the other wave-shaped part 10' at position a. Moreover, the top part 1σa of the other wave-shaped part 10' is located at the bottom part 1ob of one wave-shaped part 10. As shown in FIG. 8, this turbulence promoter A is inserted into a fluid conduit B, which is a component of the heat exchanger, and generates turbulence in the fluid at the corrugated portions 1o and 10'. It improves performance.

As shown in FIG. 9, this turbulence promoting body A is inserted into the fluid conducting pipe B and causes turbulence in the fluid.
The turbulent flow effect is large in the D section located at the top and bottom, whereas the turbulent flow effect in the fluid conduction pipe is small in the E section located on the left and right sides of the turbulence promoting body A because the flow rate of the fluid is small. The disadvantage was that heat exchange capacity was reduced because uniformity could not be obtained.

Purpose of the Invention Therefore, the present invention aims to increase the turbulent flow effect in the fluid conduit by reducing the unturbulent area existing in the fluid conduit and causing fluid turbulence over a wide area, thereby increasing the turbulent flow effect in the fluid conduit and reducing the heat loss without increasing the pressure loss inside the conduit. The purpose is to increase exchange capacity.

Structure of the Invention In order to achieve this object, the present invention provides an inclination in the transverse direction of the strip plate to the wave-shaped portion that gives a turbulent flow effect to the fluid, thereby reducing the proportion of the unturbuled area and reducing the turbulent flow in the fluid conducting pipe. By increasing the effectiveness, the heat exchange capacity is increased without increasing the pressure loss inside the pipe.

Description of examples Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1a, b, and c show a perspective view, a front view, and a plan view of the turbulence promoter 1, which is formed by pressing a strip plate of an appropriate length, and is A pair of corrugated portions 2 and 2' parallel to each other are connected via a flat connecting portion 3. The adjacent wave-shaped parts 2 and 2' of this turbulence promoting body 1 are located at the position of the top 2a (or bottom 2b) of one wave-shaped part 2 and the position of the bottom 2'b (or top 2') of the other wave-shaped part 2'. 2'a) are bulged in opposite directions, and the wave-shaped parts 2 and 2' are formed on the strip plate in order to enhance the turbulence effect on the left and right sides of the turbulence promoter 1. It is sloped in the short direction.

That is, as shown in FIG. 2, the wave-shaped part 2 has an amplitude T (distance between the top part 2a and the bottom part 2b) of the longitudinal center part of the strip plate (the side adjacent to the other wave-shaped part 2') on the outside. The band-shaped plate is inclined in the transverse direction so as to have a dog shape compared to the amplitude t of the part. Although FIG. 2 shows only one wave-shaped portion 2, the other wave-shaped portion 2' is also formed in the same manner.

FIG. 3 shows an oil cooler using the turbulence promoter 1, which includes a large number of fluid conduction pipes 4 having a U-shaped curved portion 4a, and a header 6 that connects the open ends of the fluid conduction pipes 4, respectively. , a large number of plate fins 6 that exchange heat with the fluid conduction pipe 4, and the turbulence promoter 1 is inserted into the straight pipe portion of the fluid conduction pipe 4 excluding the curved portion 4a.

That is, the turbulence promoting body 1 has the wave-shaped parts 2, 2' constituting the turbulent flow forming part inclined with respect to the flat connecting part 3, thereby changing the unturbuled region from the shaded part E in FIG. 9 to the shape shown in FIG. Figure 6a
, b, compared to the conventional turbulence promoter H, the turbulence promoter H of the present invention increases the heat transfer coefficient of the fluid inside the pipe by 40 to 50%, and ultimately improves heat transfer without increasing the pressure loss inside the pipe. Increases exchange ability by 15-20 inches. In addition, in Fig. 6,
A represents a conventional turbulence promoter, and H represents a turbulence promoter of the present invention.

Effects of the Invention As is clear from the above description, the present invention provides a wave-shaped portion that forms turbulence of a turbulence promoting body inserted into a fluid passage pipe of a heat exchanger, with the center portion facing toward the outer portion. By tilting the strip plate in the transverse direction so that the amplitude is larger than that, the proportion of the unturbuled area is reduced and the turbulent flow effect in the fluid conduction pipe is enhanced. It has the advantage of improving heat transfer coefficient and heat exchange capacity.

[Brief explanation of drawings]

Figures 1a, b, and c are a perspective view, a front view, and a plan view showing a turbulence promoter according to an embodiment of the present invention, and Figure 2 is an explanation showing the configuration of a wave-shaped portion of the turbulence promoter. Figure 3 is a perspective view of an oil cooler using the same turbulence promoter, Figure 4 is a schematic sectional view of the turbulence promoter inserted into the fluid conduction pipe of the oil cooler, and Figure 5 is a perspective view of an oil cooler using the same turbulence promoter. Figure 6 is a diagram showing the heat exchange performance when a turbulence promoting body is inserted into the fluid conduction pipe of the same oil cooler, where a is the heat transfer coefficient inside the pipe, and b is the heat transfer coefficient. Demonstrate exchange ability. Fig. 7 is a perspective view showing a conventional turbulence promoter, Fig. 8 is a schematic cross-sectional view when the turbulence promoter is inserted into a fluid conducting pipe, and Fig. 9 is a perspective view showing a conventional turbulence promoter.
The figure is a sectional view taken along line c-c' in FIG. 1... Turbulence promoter, 2.2'... Wave shaped part, 2a. 2'a...top, 2b, 2'b...
・Bottom, 3... Connecting part O Fig. 1 t (2J 2d Fig. 3 Fig. 4 Fig. 5 Fig. 6 Cα) RO number (Tonneau R8 number Fig. 7

Claims (1)

[Claims] A pair of corrugated portions are formed parallel to the longitudinal direction of the strip plate, and the pair of corrugated portions are connected by a connecting portion, and the top of one adjacent corrugated portion is connected to the bottom of the other corrugated portion. The heat exchanger is characterized in that the wave-shaped portion is inclined in the transverse direction of the strip so that the amplitude is larger in the longitudinal center portion of the strip than in the outer portion. A dexterous turbulence promoter.