JP7026916B2 - Liquid shunt for heat exchanger and Delon cup type heat exchanger - Google Patents

Description

The present invention relates to a liquid shunt used in a heat exchanger and a drone cup type heat exchanger equipped with the liquid shunt.

In recent years, due to the growing awareness of energy conservation, a system that recovers heat from waste heat and rotates a refrigeration cycle to perform air conditioning has attracted attention. They are heat-driven cycles such as the ejector refrigeration cycle and the absorption refrigeration cycle, many of which operate under reduced pressure.

A variety of heat exchangers are used in the ejector refrigeration cycle. One of them is a heat exchanger (boiler) that uses a high-temperature heat source medium such as exhaust gas to evaporate the refrigerant liquid, and a heat exchanger that removes heat from the low-temperature heat source medium (gas or water) and evaporates the refrigerant liquid. There is a (evaporator). In order to improve the evaporation efficiency, it is desirable to integrate the contact heat transfer area of gas or liquid (heat source medium and refrigerant liquid) at high density, so core units consisting of a pair of Delon cup plates are stacked in multiple stages. A Delon cup type heat exchanger is adopted. In this case, it is important to separate the supplied refrigerant liquid and bring it into parallel and uniformly dispersed contact with the surface of the Delon cup plates stacked in multiple stages.

On the other hand, in the absorption refrigeration cycle, a similar configuration is used for the evaporator and absorber. In this case, the heat source medium is often a liquid such as water, and heat exchange between the liquid and the liquid occurs. In the evaporator, heat is taken from a low temperature medium such as water to evaporate the refrigerant. On the other hand, in the absorber, a heat source medium such as cooling water is used to recover the absorbed heat generated when the absorbing liquid absorbs the refrigerant vapor. As with the ejector refrigeration cycle, it is as important for both the evaporator and the absorber to properly separate the supply liquid (refrigerant liquid and absorption liquid) in order to promote evaporation and absorption.

FIG. 7 is a diagram showing a Delon cup type heat exchanger equipped with a conventional liquid shunt. The Delon cup type heat exchanger 10 is formed by inflating the upper and lower parts in the middle, and the core unit 11 made of a pair of Delon cup plates of the same shape, which is formed in an elongated flat shape at the middle portion, is laminated in multiple stages. It is composed.

The endmost core unit 11 is provided with an inlet 17 and an outlet 18 for the heat source medium. The liquid shunt 50 is arranged above the multi-stage core unit 11 of the drone cup type heat exchanger 10, and a large number of micropores 51 are neatly and uniformly processed on the bottom surface of the rectangular flow path, and the liquid is dropped from the micropores 51. Let me. The liquid dropped from the micropores 51 flows along the outer flow path of the Delon cup plate. In the case of an evaporator or a boiler, the liquid to be dropped is a refrigerant liquid, and in the case of an absorber, the liquid to be dropped is an absorbing liquid (a mixed liquid of a refrigerant and an absorbent).

Patent Document 1 describes a Delon cup type heat exchanger. Patent Document 2 describes that a liquid is dropped from a small hole in a tube under the droplet in a heat exchanger.

Japanese Unexamined Patent Publication No. 2010-27953 Japanese Unexamined Patent Publication No. 6-101984

However, processing a large number of micropores is time consuming and expensive. Further, there is a problem that the dropping amount is not always uniform due to the difference in the inflow direction of the liquid and the difference in the size of the holes.

Further, in the multi-stage laminated Delon cup plates, the laminated dimensions of the entire product are likely to change due to the accumulation of slight dimensional differences between the individual plates. Therefore, there is a problem that the outer surface flow passage of the Delon cup plate corresponding to the hole position of the dropping is likely to be displaced.

The liquid diverting device for a heat exchanger of the present invention was made in view of the above-mentioned problems, and a liquid flow path forming a flat shape surrounded by both plates by joining two sides of two triangular plates. A liquid that forms a slit-shaped liquid outlet that communicates with the liquid flow path with the remaining bottoms of both plates as open ends, and communicates with the liquid flow path near the triangular apex facing the bottom of one plate. It is characterized by forming an inflow port.

According to the liquid shunt for heat exchanger of the present invention, it is inexpensive and easy to manufacture, and the liquid can be dropped uniformly. Further, when the liquid shunt for heat exchanger of the present invention is used for the Delon cup type heat exchanger, the liquid can be appropriately dropped into the outer flow passage of the Delon cup plate regardless of the dimensional difference of the Delon cup plate. ..

It is a schematic perspective view which shows the Delon cup type heat exchanger provided with the liquid shunt for a heat exchanger according to the embodiment of this invention. It is sectional drawing of the Delon cup type heat exchanger. It is a front view of the liquid shunt for a heat exchanger according to the embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line XX of FIG. It is a top view seen from the liquid outlet side of the liquid shunt for a heat exchanger according to the embodiment of this invention. It is a perspective view of a corrugated sheet. It is a schematic perspective view which shows the Delon cup type heat exchanger provided with the liquid shunt for a conventional heat exchanger.

A liquid shunt for a heat exchanger according to an embodiment of the present invention and a drone cup type heat exchanger provided with the same will be described with reference to FIGS. 1 to 6.

As shown in FIGS. 1 and 2, the drone cup type heat exchanger 10 is formed from a pair of drone cup plates having the same shape, which are formed by inflating the upper and lower parts in the middle and forming an elongated flat shape at the middle portion. The core unit 11 is configured by stacking the core units 11 in multiple stages.

The upper and lower middle portions 12, 13 of one core unit 11 are joined to the middle portions 12, 13 of adjacent core units 11. The upper and lower middle portions 12 and 13 are communicated with each other through the communication holes 14 and 15, respectively. An end plate 16 is joined to the core unit 11 located at the outermost end, and an inlet 17 and an outlet 18 of the heat source medium are provided at positions corresponding to the communication holes 14 and 15.

A heat source medium such as exhaust gas or water flows in from the inflow port 17 depending on the application of the drone cup type heat exchanger 10. In FIG. 1, the flow of the supply liquid (refrigerant liquid, absorption liquid) is shown by a broken line arrow, and the flow of the heat source medium (exhaust gas, water, etc.) is shown by a solid line arrow.

The liquid shunt 20 is arranged above the multi-stage core unit 11 of the drone cup type heat exchanger 10, and drops liquid toward the outer surface flow passage of the multi-stage stacked core unit 11.

The configuration of the liquid shunt 20 will be described with reference to FIGS. 3 to 6. Two sides of two triangular plates 21 and 22 of the same shape, which have been drawn by a press, are joined to each other by welding or the like to provide a flat liquid flow passage 23 surrounded by both plates 21 and 22.

The remaining bottoms of both plates 21 and 22 are provided with a slit-shaped liquid outlet 24 communicating with the liquid flow passage 23 as an open end. A liquid inlet 25 communicating with the liquid flow passage 23 is provided near the triangular apex P facing the bottom of one plate 21. A liquid (for example, water), which is a supply liquid, flows in from the liquid inlet 25. A pipe for supplying liquid is connected to the liquid inlet 25 so as to be substantially perpendicular to both plates 21 and 22.

According to the liquid shunt 20, the liquid flowing in from the liquid inlet 25 collides with the inner wall surface 26 of the plate 22 facing the plate 21 and is dispersed radially. When the liquid collides from a substantially vertical direction and is uniformly dispersed radially, the liquid can be dropped toward the outer surface of the core unit 11 with a substantially uniform distribution when flowing out from the slit-shaped liquid outlet 24. .. Further, since the liquid shunt 20 can be composed of pressed sheet metal processed parts, it is inexpensive and easy to manufacture.

The triangular plates 21 and 22 do not have to be triangular in a strict sense, and include those cut out near the left and right vertices as shown in FIGS. 1 to 3. Further, in order to make the flow of the liquid symmetrical, it is preferable that the plates 21 and 22 have an isosceles triangle shape.

Further, as shown in FIGS. 5 and 6, by installing the corrugated plate 27 between the plates 21 and 22 near the liquid outlet, more uniform dropping is realized and at the same time, stable even in the ultra-low flow rate range. It becomes possible to drip. The corrugated sheet 27 is formed by folding back a flat plate so that peaks and valleys are alternately repeated. The corrugated sheet 27 is inserted so that the direction from the mountain portion to the valley portion to the mountain portion is parallel to the bottoms of both plates 21 and 22.

Further, as shown in FIG. 4, the distance between the facing surfaces between the plates 21 and 22 is wide in the vicinity of the liquid inlet 25, and flows into the liquid inlet 25 by narrowing toward the liquid outlet 24. The liquid temporarily stays in the vicinity of the liquid and then flows toward the liquid outlet 24, so that the liquid can be more evenly dispersed. The liquid dropped from the liquid outlet 24 flows along the outer flow path of the Delon cup plate of the Delon cup type heat exchanger 10.

In the case of the ejector refrigeration cycle, the drone cup type heat exchanger 10 is used as a boiler or an evaporator, and a heat source medium (exhaust gas or water) flows in from the inflow port 17. The heat source medium that has flowed into the Delon cup from the inflow port 17 flows through the flow passage under the Delon cup type heat exchanger 10 through the communication hole 14, and rises in the flow passage 19 in the middle portion of the elongated flat shape. While exchanging heat with the liquid (refrigerator) dropped from the liquid diversion device 20, the dropped liquid (refrigerator) is evaporated and circulates through the upper flow passage through the communication hole 15 from the outlet 18. Go back to the circuit. In FIG. 2, the flow of the liquid (refrigerant) is indicated by a broken line arrow, and the flow of the heat source medium is indicated by a solid line arrow.

In the absorption refrigeration cycle, a similar configuration is utilized for the evaporator and absorber. In this case, the heat is exchanged between the liquid and the liquid. When the Delon cup type heat exchanger 10 is used as an evaporator, a heat source medium such as water flows in from the inflow port 17, and the liquid (refrigerant) is exchanged with the liquid (refrigerant) dropped from the liquid diversion device 20. ) Is evaporated to make refrigerant steam. On the other hand, when the Delon cup type heat exchanger 10 is used as an absorber, a heat source medium such as cooling water flows in from the inflow port 17 to exchange heat with the liquid (absorbent liquid) dropped from the liquid diversion device 20. By doing so, the absorption heat generated when the absorption liquid absorbs the surrounding refrigerant vapor is recovered.

10 Delon cup type heat exchanger 11 Core unit 12, 13 Central part 14, 15 Communication hole 16 End plate 17 Inlet 18 Outlet 20 Liquid shunt 21,22 Triangular plate 23 Liquid outlet 24 Liquid outlet 25 Liquid flow Entrance 26 Inner wall surface 27 Corrugated sheet

Claims (6)

A slit-shaped liquid flow passage is provided in which two sides of two triangular plates are joined to form a flat shape surrounded by both plates, and the remaining bottoms of both plates are used as open ends to communicate with the liquid flow passage. A liquid diversion device for a heat exchanger, characterized in that a liquid outlet is provided and a liquid inlet communicating with the liquid flow path is provided in the vicinity of a triangular apex facing the bottom of one plate. The liquid shunt for a heat exchanger according to claim 1, wherein a corrugated plate is inserted between both plates near the liquid outlet. The liquid shunt for a heat exchanger according to claim 1 or 2, wherein the distance between the facing surfaces between the two plates is wide in the vicinity of the liquid inlet and narrows toward the liquid outlet. In a drone cup type heat exchanger formed by stacking a pair of drone cup plates formed by inflating the upper and lower parts in the middle and forming an elongated flat shape in the middle part in multiple stages.
Equipped with a liquid shunt that drops liquid toward the outer surface of a pair of multi-tiered Delon cup plates.
The liquid flow exchanger is provided with a flat-shaped liquid flow passage in which two sides of two triangular plates are joined to each other to form a flat shape surrounded by both plates, and the liquid flow passage is provided with the remaining bottoms of both plates as open ends. A drone cup type heat exchanger characterized in that a slit-shaped liquid outlet communicating with the liquid outlet is provided, and a liquid inlet communicating with the liquid flow passage is provided near a triangular apex facing the bottom of one plate. The drone cup type heat exchanger according to claim 4, wherein a corrugated plate is inserted between both plates near the liquid outlet. The drone cup type heat exchanger according to claim 4 or 5, wherein the distance between the facing surfaces between the two plates is wide in the vicinity of the liquid inlet and narrows toward the liquid outlet.

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