JPH0539326Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an improved plate type heat exchanger for exchanging heat between three fluids.

(Prior art) For example, in engines for industrial vehicles and ships, lubricating oil is cooled with engine cooling water or seawater to maintain a constant temperature. The illustration is as shown in Fig. 6 A and B, and a horizontally elongated dish-shaped plate 1 is provided with a rising piece 1a on the periphery and a pair of circular through holes 1b on both left and right sides. Overlapping through hole 2a and inward U-shaped open passage 2b
A rectangular spacing piece 2 having a shape formed thereon is attached so that the positions of the through hole 2a and the open passage 2b are different for the left and right ones, and alternately different for the upper and lower ones, and a corrugated fin is installed between the spacing pieces 2 on both sides. 5 are arranged, and such dish-shaped plates 1 are stacked in a required number of stages, and upper and lower lid plates 3 and 4, respectively, each having an inlet pipe 3a or 4a and an outlet pipe 3b or 4b attached to the top and bottom stages, are stacked. , each plate is airtightly brazed to each other, and lubricating oil, which is a fluid to be cooled, flows in from the upper inlet pipe 3a, passes diagonally through the required plate 1 as shown by the solid line arrow, and flows out from the lower outlet pipe 4b. and also
Cooling water is made to flow in from the lower inlet pipe 4a, pass diagonally through a plate 1 different from the lubricating oil plate, and flow out from the upper outlet pipe 3b, so that heat exchange between the fluids occurs in the process. ing.

(Problem that the invention aims to solve) Recently, so-called co-generation systems have been introduced in hotels, office buildings, hospitals, etc., which not only generate electricity, but also recover the heat of exhaust gas and engine cooling water and use it for hot water supply and space heating. ration system (combined heat and power generation system) has been attempted, but since the conventional heat exchanger described above can only flow two types of fluid, a single cooling medium is used to recover exhaust heat and engine cooling water heat at the same time. At least two heat exchangers are required, which not only complicates the piping but also causes heat loss and may reduce the amount of recovered heat.

Therefore, the purpose of this invention is to provide a heat exchanger that can simultaneously recover the heat of two fluids using one cooling medium, and that can efficiently recover the heat without causing heat loss.

(Means and effects for solving the problem) In order to achieve the above object, this invention has a horizontally long groove-shaped plate having through holes at both ends. Each of the above-mentioned plate-type heat exchangers can be used as a plate-type heat exchanger in which spacer pieces each having open passages in different directions are installed so that the positions of the through holes and the open passages are staggered at both ends and different at the top and bottom, and stacked in the required number of stages. A required number of downwardly tapered ventilation cylinders are arranged in parallel in the center of the groove-shaped plate, and the groove-shaped plates are stacked by fitting the tip of each upper ventilation cylinder into the base end of the lower ventilation cylinder, respectively. The upper end plate or the first end plate has the first and second outlet pipes on the upper or lower stage thereof.
Lower end plates each having an inlet pipe are installed, and cooling fluids having different temperatures are allowed to flow into the first and second inlet pipes, while fluid to be cooled is allowed to flow into the vent pipe of the groove-shaped plate. It is characterized by the fact that

Then, a high-temperature fluid such as engine exhaust is allowed to flow into each vent cylinder of the stacked groove-shaped plates that are connected vertically, and a relatively high-temperature primary cooling fluid such as engine cooling water is allowed to flow into the first inlet pipe. In addition, if a low-temperature secondary cooling fluid such as tap water is allowed to flow into the second inlet pipe, the primary and secondary cooling fluids will pass through the open passages of the spacer and into the predetermined groove-shaped plate. enters the slotted plate, flows sideways around the vent pipe in the slotted plate to the opposite side, flows upwardly through the open passage in the opposite spacer, and exits from the first and second outlet pipes, respectively. It flows towards the direction. During the flow process, heat exchange occurs between the high temperature fluid and the primary and secondary cooling fluids and between the primary and secondary fluids.

(Example) Figures 1 to 3 show an example of this invention, but Figure 1 shows the main parts separated and turned upside down to make the configuration easier to understand.
Reference numeral 1 denotes a horizontally elongated plate press-molded into a downward groove shape with a slightly open bottom (in figure 1, it has an upward groove shape). A pair of through holes 11b are provided in both left and right ends of the plate 11, and a through hole 12a that overlaps the pair of through holes 11b and an inward U-shaped open passage 12b are provided.
The rectangular spacing pieces 12 are installed so that the positions of the through holes 12a and the open passages 12b are alternated on the left and right sides, and alternately different on the top and bottom. In the central part, a required number of ventilation cylinders 13 having a tapered truncated conical shape and having a height almost the same as the groove depth of the plate 11 are protruded downward in several rows at predetermined intervals. Ventilation tube 1 on the top plate when stacked
3 is adapted to fit into the base end of the vent tube 13 of the lower plate.

The required number of groove-shaped plates 11 as described above,
As shown in FIGS. 2 and 3, both side pieces of the lower plate fit into both side pieces of the upper plate, and the tips of the respective ventilation cylinders 13 of the upper plate are connected to the base ends of the ventilation cylinders of the lower plate, respectively. They are stacked together so that the through holes 12a of the left and right spacing pieces and the open passages 12b are aligned, and the upper layer is provided with a window hole 14c surrounding the arrangement part of the ventilation cylinder 13 of the plate in the center, and on both sides. Open passage 12b on the front side or rear side of the spacer piece 12 (rear side in FIG. 2B, vice versa in FIG. 1)
or the first outlet pipe 1 corresponding to the through hole 12a
4a and the upper end plate 14 provided with the second outlet pipe 14b are stacked, and an insertion port 15c that fits into the tip of each ventilation cylinder 13 of the upper plate is erected in the lower part at the center, and The through hole 12a or open passage 12 on the rear or front side of the spacer piece 12
The first inlet pipe 15a and the second inlet pipe 15b corresponding to b are overlapped with the lower end plate 15 provided at different positions from the outlet pipes 14a and 14b, and the fitting part of the upper and lower plates 11, the ventilation pipe 13
The fitting portions of the comrades, the insertion portions of the insertion port 15c, and the contact portions of the end plates 14 and 15 are brazed and assembled integrally.

Furthermore, the hood member 1 is provided with a third inlet pipe 16a on the upper and lower end plates 14 and 15.
The hood member 17 provided with the sixth or third outlet pipe 17a is screwed in an airtight manner, respectively.

Based on the above configuration, engine cooling water _W1 is allowed to flow in from the first inlet pipe 15a of the lower end plate 15, and secondary cooling water _W2 such as tap water or underground water is allowed to flow in from the second inlet pipe 15b. The exhaust gas g of the engine is made to flow in from the third inlet pipe 16a of the upper hood member 16 so as to face the third inlet pipe 16a of the upper hood member 16. Then, the exhaust gas g passes through each ventilation cylinder 13 of the stacked plates 11 as shown by the white line arrow, flows out to the outside from the third outlet pipe 17a of the lower hood member 17 via the insertion port 15c of the lower end plate 15, The engine cooling water W ₁ passes through the through hole 12a of the spacer piece 12 of the laminated groove-shaped plate as shown by the solid line arrow in FIG. Directional open passage 1
2b, enters the groove of the plate 11, flows sideways while circulating around a large number of ventilation cylinders 13, reaches the other side, and enters the inward open passage 1 of the spacer piece 12 on the other side.
2b and the first outlet pipe 1 of the upper end plate 14.
The secondary cooling water W 2 flows out from 4a to the engine side, and the secondary cooling water W ₂ flows into the engine cooling water W ₁ as shown by the double dotted line.
It enters the groove of the plate 11 from the open passage 12b of the spacer piece 12 on the other side of the groove-shaped plate 11 at a different stage (the odd-numbered stage in FIG. The open passage 12 of the spacer piece 12 on one side flows sideways while circulating around and faces one side.
b and flows upward through the through hole 11b of the plate,
It flows out from the second outlet pipe 14b of the upper end plate 14 toward the hot water supply equipment or heating equipment.

In the process of flow of these three fluids,
Exhaust gas g passes through many ventilators 13 on each groove-shaped plate 11 to engine cooling water W ₁ and secondary cooling water W ₂
It is also cooled by engine cooling water W ₁
(which has a considerably higher temperature than the secondary cooling water W ₂ ), including the heat of the taken-in exhaust gas g, is cooled by the secondary cooling water W ₂ through the wall plate of the groove-shaped plate 11. In other words, the heat of the exhaust gas and the heat of the engine cooling water are simultaneously recovered by the secondary cooling water _W2 .

Figure 4 shows the passages provided in the groove-shaped plate into which the secondary cooling water W 2 flows, without changing the heat transfer area between the engine cooling water W ₁ and _{the secondary cooling water W 2 ,} that is, the area of the groove bottom of the plate 11. The height of cylinder 13 (i.e. the depth of the groove on the plate)
Ventilation cylinder 13 of groove-shaped plate 11 into which W ₁ flows
This is an example of a modification in which the secondary cooling water W ₂ has a larger heat transfer area with respect to the exhaust gas g, and more heat from the exhaust gas g is recovered by the secondary cooling water W ₂ . be.

In the case where the two cooling waters W ₁ and W ₂ receive equal amounts of exhaust heat, as in the example shown in Figure 3, the engine cooling water may suffer from insufficient cooling depending on the temperature, flow velocity, etc. However, in the above example, there is no need to worry about this.

Further, the positions of the through holes 12a and the inward open passages 12b of the spacer piece 12 are upper and lower, and do not necessarily have to be alternate. That is, the engine coolant W ₁ and the secondary coolant W ₂ do not necessarily have to form alternating layers. Further, the spacer piece 12 is formed into a P shape as shown in FIG.
A through hole 12a and an inward open passage 12b may be formed to overlap each other in 1b.

In addition, in the illustrated example, the engine cooling water flows into the first inlet pipe and the secondary cooling water flows into the second inlet pipe, but this may be reversed. This is not limited to engine exhaust or engine cooling water, but other fluids may be used as long as it is necessary to recover the heat of two fluids using one cooling medium.

(Effects of the invention) As described above, in this invention, a spacer piece is provided with a through hole and an inward open passage in both ends of a groove-shaped plate. As a plate-type heat exchanger in which the upper and lower parts are installed differently and stacked in the required number of stages, the center of each groove-shaped plate is provided with the required number of downwardly tapered ventilation cylinders, and the tip of each upper ventilation cylinder is A groove-shaped plate is laminated by being fitted to the base end of the lower ventilation cylinder, and an upper end plate having a first and second outlet pipe or a first and second inlet pipe is provided at the upper or lower stage thereof. Lower end plates are attached to each, and cooling fluids of different temperatures are allowed to flow into the first and second inlet pipes, while the fluid to be cooled is allowed to flow into the ventilation tube of the groove-shaped plate, so that It is possible to simultaneously exchange heat between three fluids flowing through the cooling fluid, and the heat of the other two fluids can be efficiently and reliably recovered by one secondary cooling fluid, and there is no need for extra piping. It also has low heat loss and can be effectively used for hot water supply or heating in office buildings, hotels, hospitals, etc., and has high practical value.

[Brief explanation of the drawing]

Figure 1 is a perspective view of an embodiment of this invention with the top and bottom reversed and separated, Figure 2A is a front view of the assembled state, Figure 3B is its plan view, and Figure 3 is the 2
4 is a sectional view of the same part as in FIG. 3 of a modified example, FIG. 5 is a perspective view of a plate using another example of a spacing piece, and FIG. A is an exploded perspective view of a conventional product, and B is an assembled front view. In the figure, 11... Groove plate, 11b... Through hole, 12... Spacing piece, 12a... Through hole, 12b...
...open passage, 13...ventilation cylinder, 14...upper end plate, 14a, 14b...first and second outlet pipes, 15...lower end plate, 15a, 1
5b...First and second inlet pipes, 15c...Inlet, 16, 17...Hood member.

Claims (1)

[Scope of utility model registration request] Inside both ends of the oblong groove-shaped plate 11 having through holes 11b at both ends, there are through holes 11b of the plate.
A spacer piece 12 having a through hole 12a and an inward open passage 12b that are aligned with each other is connected to the through hole 12a and the open passage 1.
In a plate-type heat exchanger in which the positions of the plates 2b are staggered on both ends and different on the top and bottom, and the required number of stages are stacked, each groove-shaped plate 11 has a downwardly tapered vent pipe 13 in its center.
A required number of groove-shaped plates 11 are arranged in parallel, and the tip of each upper ventilation cylinder 13 is fitted into the base end of the lower ventilation cylinder 13, and the groove-shaped plates 11 are stacked. 2 outlet pipe 14a,
14b or a lower end plate 15 having first and second inlet pipes, respectively, and cooling fluids having different temperatures are allowed to flow into the first and second inlet pipes 15a and 15b, respectively. . A plate heat exchanger, characterized in that a fluid to be cooled is allowed to flow into the ventilation tube of the groove-shaped plate.