JPS6051036B2 - Plate heat exchange device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate type heat exchange device, and more particularly to a plate type heat exchange device called an impinging jet type.

In general, plate heat exchange devices such as plate heat exchangers, plate evaporators, and plate condensers handle heat exchange between two fluids (gas or fluid) flowing through heat transfer plates. However, the conventional plate heat exchange device has the following drawbacks.

In other words, in order to obtain high heat transfer, a complex pattern is formed on the heat transfer surface to disturb the flow of fluid, so we must be prepared for high pressure loss. , it may not be possible to obtain a high heat transfer coefficient due to pressure loss. Furthermore, in the case of a highly viscous fluid, the fluid often reaches portions of the heat transfer surface farther from the fluid inlet/outlet, causing drift on the heat transfer surface, making it impossible to obtain high heat transfer performance. Furthermore,
If used for a long time, dirt will adhere to the heat transfer surface, resulting in a significant drop in performance. Therefore, in view of the above-mentioned conventional drawbacks, the applicant of the present invention has already proposed an impinging jet type plate heat exchanger having a novel structure for the purpose of improving and eliminating the above-mentioned drawbacks. (Example: Patent application 52-5270
(Japanese Patent Application No. 52-5272, Japanese Patent Application No. 52-9029).

Its structure, as schematically shown in FIG. 1, consists of heat transfer plates 1 and 2 as heat transfer elements, and injection plates 3 and 4 in which a large number of injection holes 5 are bored. , 1st
The fluid is ejected from the supply space A into the ejection space B through the ejection holes 5 of the ejection plate 3 or 4 and collides with the heat transfer surface of the adjacent and opposing heat transfer plate 2 or 1. or the second in the adjacent supply space C via 1.
By the way, heat transfer by impinging jets in this type of impinging jet type plate heat exchanger requires a sudden change in the flow direction of the jet (at right angles). However, in reality, adjacent impinging jets do not interact with each other. Dynamic layers generated by collision are also recognized as one of the factors promoting high heat transfer.

This invention focuses on the fact that the dynamic layer is one of the factors that promotes high heat transfer as described above, and aims to provide an impinging jet type plate heat exchange device that can exhibit excellent heat transfer performance. be.

For this reason, the present invention is to shorten the distance between the ejection holes by drilling a large number of small holes instead of the large ejection holes with a sufficient distance between the holes that are drilled in the conventional injection plate. This ensures that a large number of dynamic layers are generated when adjacent colliding jets collide with each other on the heat transfer surface of the heat transfer plate, thereby achieving high heat transfer.

The structure of the present invention will be described below with reference to an impingement jet type plate heat generator that handles the evaporation effect of the liquid to be evaporated by heat exchange between the liquid to be evaporated, for example, the first fluid, and the heating medium, for example, the first fluid. The explanation is as follows.

In FIGS. 3 and 4, reference numeral 11 denotes an injection plate, which has a large number of injection holes 12 for ejecting the liquid to be evaporated, and the distance between the holes is close to each other to form a group of circular holes. It has been drilled.

Reference numeral 13 denotes a heat transfer plate, on which a jet of liquid to be evaporated collides with a heat transfer surface on one side, and a heating medium flows along the heat transfer surface on the other side.

According to the configuration of the present invention as described above, the injection plate 11
The jet of the liquid to be evaporated injected from the jet hole 12 collides with the adjacent and opposing heat transfer surfaces, and then sequentially spreads around the jet collision point to the outer periphery and collides with the wake of the adjacent jet. Together, they disturb the laminar flow and create turbulent flow, creating a dynamic layer.

Therefore, in the present invention, the injection plate 11 has a large number of injection holes 12 arranged close to each other to form a group of circular holes, so that many dynamic layers are generated on the heat transfer surface of the heat transfer plate 13. to improve heat transfer. Incidentally, in order to generate more dynamic layers on the heat transfer surface of the heat transfer plate 13, the ejection holes 12 should be similarly bored over the entire surface of the ejection plate 11 with close distances between the holes. However, taking into account the strength of the injection plate 11, it is preferable to configure the hole groups as shown in FIG.

Further, the shape of the hole group of the ejection holes 12 is not limited to the circular shape as shown in FIG. 3, but may be formed in the shapes shown in FIGS. 5 to 7, or many other shapes.

Furthermore, it is clear that the invention is not limited to the evaporator described and illustrated, but can also be applied to heat exchangers, condensers and other plate heat exchange devices of the impinging jet type. Moreover, numerous embodiments are possible without departing from the gist of the invention. As explained above, the present invention provides an impinging jet type plate heat exchange device with a large number of jet holes in the jet plate and a distance between the holes so as to generate a large number of dynamic layers on the heat transfer surface of the heat transfer plate. Since they are drilled in close proximity to each other, heat transfer is promoted by the active layer, making it possible to obtain an impinging jet type plate heat exchanger with excellent heat transfer performance.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the general configuration of an impinging jet type plate heat exchanger, Fig. 2 is a front view of the main part of a conventional plate, and Fig. 3
3 and 4 show an embodiment of the present invention, FIG. 3 is a front view of the main part of the plate, FIG. 4 is a vertical sectional view of the main part taken along the line ■-■ in FIG. 7 are main part front views of the injection plate of the plate showing some examples of the shape of the hole group of the injection holes. 11... injection plate, 12... injection hole, 13...den A7) (choboku.

Claims (1)

[Claims] 1. A heat transfer plate and an injection plate having a large number of injection holes are formed in a palm-to-hand manner, and the first fluid is ejected from the supply space of the first fluid through the injection holes of the injection plate to the adjacent and opposing heat transfer plate. In an impinging jet type plate heat exchange device, the heat transfer plate collides with the heat transfer surface of the heat transfer plate, thereby exchanging heat with the second fluid in the adjacent supply space via the heat transfer plate. 1. A plate type heat exchange device, characterized in that an injection plate is provided with a large number of injection holes closely spaced so as to generate a large number of dynamic layers on the heat transfer surface of the injection plate.