JP3954891B2 - Heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger that performs heat exchange between two types of fluids, and more particularly, to a heat exchanger that is applied to a heat pump type water heater using a refrigerant.
[0002]
[Prior art]
A heat exchanger incorporated in a heat pump type water heater that uses a refrigerant as a heat source is required to have a structure that can withstand the use of a high-temperature and high-pressure refrigerant (CO2 refrigerant). In recent years, a large number of capillary tubes (φ There has been proposed a structure in which a refrigerant passage is formed by closely juxtaposing several millimeters of copper thin tubes). This heat exchanger enables the use of a high-pressure refrigerant by using a capillary tube, and promotes efficient condensation with a small diameter. The water passage is a thin type in which two drawn plates are joined. It is formed of a box. The inner fin is housed in the box, and the capillary tube is laminated on the box, and these members are formed of a copper material, thereby enabling batch joining by brazing.
[0003]
[Problems to be solved by the invention]
In such a heat exchanger, the shape of the inner fin is complicated in order to obtain a sufficient heat transfer area, the processing is complicated, and the cost is high. In addition, a long capillary tube is used in order to obtain a predetermined capacity, and the outer shape of the heat exchanger is thin and long, so that there is a limit to installation in the apparatus.
[0004]
The present invention is intended to solve these problems, and by improving the thermal efficiency by dramatically increasing the heat transfer area, it is possible to reduce the installation space by downsizing, as well as assembly workability and production. An object of the present invention is to provide a heat exchanger that is excellent in performance and inexpensive to manufacture.
[0005]
[Means for Solving the Problems]
A heat exchanger according to a first aspect of the present invention is the wall surface of a corrugated plate having a rectangular wave shape in cross section , in which two drawn plates are joined to form a thin rectangular box by joining the peripheral edges. The corrugated plate is folded at the side edges, and the folded surface of the corrugated plate is joined to the plate and stored in the box. And a meandering fluid passage extending from an inlet opening at the peripheral edge of the box to an outlet opening at a position facing the inlet is formed. The capillary flow inside the other fluid, as the other fluid is opposed to the one fluid stream, and from one side end of the box body in a spiral shape so as to flow to the other side end It is wound and joined to both flat surfaces of the box .
[0006]
Since the heat exchanger of the present invention is configured as described above, the wall surface of the corrugated plate divides the box body into a number of folded water passages, and the total length of one fluid flow path is formed extremely long. One of the fluids flowing into the box from the inlet flows through this long-distance flow path, the other fluid flows through the narrow tube facing one of the fluids, and the wall functions as a heat transfer fin. Heat exchange takes place via both flat surfaces of the body. In this way , the heat efficiency is improved by a dramatic increase in the heat transfer area, and the heat exchanger can be downsized.
[0007]
A heat exchanger according to a second aspect of the present invention is the wall surface of the corrugated plate in which the two peripheral plates are joined together to form a thin rectangular box by joining the peripheral edges thereof. The corrugated plate is folded at the side edges, and the folded surface of the corrugated plate is joined to the plate and stored in the box. And a meandering fluid passage extending from an inlet opening at the peripheral edge of the box to an outlet opening at a position facing the inlet is formed. Then, the narrow tube in which the other fluid flows is branched into two paths, and the narrow tube in each path is arranged so that the other fluid faces one fluid flow and from one side end side of the box to the other side. It serpentines in a serpentine shape so as to flow to the end side, and is joined to both flat surfaces of the box. Similarly, in this heat exchanger, one fluid that has flowed into the box from the inlet flows through a long-distance passage, and the other fluid flows through the narrow tube opposite to the one fluid. Heat exchange is performed through the surface, and the heat efficiency is improved by a dramatic increase in the heat transfer area, and the heat exchanger can be downsized.
[0008]
In these heat exchangers, the passage of the other side of the fluid can also be formed by intimate juxtaposition a plurality of capillaries.
[0009]
The heat exchanger according to the present invention is particularly applicable to a heat pump type hot water heater in which one fluid is water and the other fluid is a refrigerant, and the components are formed of a copper material to heat the assembly. By brazing in the furnace and manufacturing, it is possible to join together in a single process and improve productivity.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below based on examples of the drawings.
FIGS. 1 to 5 are application examples of a heat exchanger incorporated in a heat pump type hot water heater using a refrigerant in the embodiment of the first invention. In the figure, two upper and lower plates (upper plate 21 and lower plate 22) obtained by drawing a copper plate into a shallow container shape are joined together to form a thin rectangular box 20, and on the periphery of the box The inlet 23 is opened, the outlet 24 is opened on the opposite side, and a water passage from the inlet 23 to the outlet 24 is formed.
[0011]
A corrugated plate 30 in which a copper plate is corrugated is accommodated in the box 20, and this corrugated plate 30 has a plane shape in which the upper and lower folded surfaces (mountain surfaces and valley surfaces) are flat and the cross section is a continuous rectangular wave. The outer shape (length × width × height) is adapted to the inner size of the box 20. On the wall surface 32 of the corrugated plate 30, window-like openings 33 are formed at the left and right alternating side end positions, and are accommodated in the box 20 with the wall surface 32 orthogonal to the water flow direction. Are joined to the upper and lower plates 21 and 22, respectively.
[0012]
As shown by the arrows in FIG. 1, the refrigerant passages are arranged in close contact with each other so that the refrigerant faces the flow of water in the water passage and from one side end side of the box 20. is formed by winding in a spiral manner around the circumference of the box 20 so as to flow to the other side end, capillary 10 is joined to both the flat surface of the box body 20 (front and back).
[0013]
The heat exchanger accommodates the corrugated plate 30, temporarily contacts the flanges formed on the peripheral edges of the upper and lower plates 21, 22, temporarily assembles the box body 20, winds the thin tube 10 around the box body 20, and each joint surface A brazing material is installed on and assembled with a predetermined jig. This assembly is put into a heating furnace, brazed, and manufactured in a single process in a batch.
[0014]
In the heat exchanger comprised as mentioned above, the state of the water flow path formed in the box 20 is shown in FIG. As shown in the figure, the wall surface 32 of the corrugated plate 30 divides the inside of the box 20 into a number of folded water passages, and the total length of the water passages that meander by alternately folding at the left and right side ends is the length of the wall surface 32. × The number of turns is extremely long. The water flowing into the box 20 from the inlet 23 flows through this long-distance water passage, and the high-temperature and high-pressure refrigerant flows through the narrow tube 10 wound spirally around the box 20 in opposition to the water flow. The wall surface 32 functions as a heat transfer fin, heat exchange is performed via both flat surfaces of the box body 20, and water flowing through the water passage is heated and discharged from the outlet 24.
[0015]
6 and 7 show an embodiment of the second invention, which is an application example of a heat exchanger incorporated in a heat pump type water heater using a refrigerant. In this heat exchanger, two upper and lower plates 21 and 22 are joined to form a box 20, and a corrugated plate 30 having the same shape as the previous example is housed in the box 20, and the inlet 23 has the same configuration as the previous example. A meandering water passage extending from the outlet to the outlet 24 is formed.
[0016]
The refrigerant passage is branched into two paths, and the two copper thin tubes 12 and 13 are branched into a front side flat surface and a back side flat surface of the box 20, and the thin tubes 12 and 13 of each path are indicated by arrows in FIG. In addition, the serpentine meanders on each flat surface of the box body 20 so that the refrigerant faces the water flow in the water passage and flows from one side end side of the box body 20 to the other side end side. Are joined together.
[0017]
This heat exchanger is manufactured by brazing in a heating furnace as in the previous example, and the water flowing into the box 20 from the inlet 23 passes through a long-distance meandering water passage formed in the box 20 as well. It circulates and circulates in the narrow tubes 12 and 13 into which the high-temperature and high-pressure refrigerant is branched , facing the flow of water, heat is exchanged through both flat surfaces of the box 20, heated, and discharged from the outlet 24. .
[0018]
As mentioned above, although each Example was explained in full detail, this invention is applied to the other heat exchanger which heat-exchanges between two types of fluid other than the heat exchanger incorporated in the heat pump type water heater using a refrigerant | coolant. It is possible, and the fluid flowing through the narrow tubes 10, 12, 13 is not necessarily limited to the refrigerant.
[0019]
【The invention's effect】
In the heat exchanger of the present invention, the corrugated plate 30 is accommodated in the box 20, the wall surface 32 of the corrugated plate 30 serves as a partition, the box 20 is partitioned into a number of folded flow passages, and the flow of one fluid The entire length of the road is formed to be extremely long, and the corrugated plate 30 functions as a heat transfer fin by joining the upper and lower folded surfaces to the plates 21 and 22. Further, in the first invention is wound helically tubules 10 in the box 20, by the second aspect of the invention joined by meandering serpentine in each flat surface of the box body 20, the long tubule 10 , 12, 13 can be used, and the flow path of the other fluid is also formed to be very long. Then, the flow of one fluid and the other fluid are made to face each other to improve the efficiency of heat exchange, and in both configurations, heat exchange is performed via both flat surfaces of the box body 20, and the heat transfer area is dramatically increased. And is extremely excellent in thermal efficiency. As a result, it is possible to reduce the size of the heat exchanger, and to save space for installation in the device.
[0020]
Moreover, since the heat exchanger of this invention accommodates and assembles one corrugate board 30 in the box 20, assembly work is also easy, a component is formed with a copper material, and an assembly is put in a furnace. By introducing and brazing and manufacturing, batch bonding can be performed in one process, and the manufacturing cost can be significantly reduced by improving productivity.
[Brief description of the drawings]
FIG. 1 is a plan view of an embodiment of the first invention.
FIG. 2 is also a front view.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is an explanatory diagram of a water channel.
FIG. 5 is an exploded perspective view of a main part.
FIG. 6 is a plan view of an embodiment of the second invention.
FIG. 7 is also a front view.
[Explanation of symbols]
10, 12, 13 Narrow tube 20 Box body 21, 22 Plate 23 Inlet 24 Outlet 30 Corrugated plate 32 Wall 33 Opening

Claims (5)

A thin rectangular box 20 is formed by joining the two plates 21 and 22 that have been drawn and joined at the periphery.
Openings 33 are formed in the wall surfaces 32 of the corrugated plate 30 having a rectangular wave cross section at left and right alternating side end positions, and the folded surfaces of the corrugated plate 30 are joined to the plates 21 and 22 to be inside the box body 20. The box body 20 is folded back alternately at the side edges of the box body 20, the inside of the box body 20 is partitioned by the wall surface 32 of the corrugated plate 30, and opens from the inlet 23 opened to the periphery of the box body 20 to a position facing the inlet 23. Forming a meandering fluid path to the outlet 24;
The narrow tube 10 through which the other fluid flows is spirally formed so that the other fluid faces the one fluid flow and flows from one side end side of the box 20 to the other side end side. A heat exchanger that is wound and joined to both flat surfaces of the box 20. A thin rectangular box 20 is formed by joining the two plates 21 and 22 that have been drawn and joined at the periphery.
Openings 33 are formed in the wall surface 32 of the corrugated plate 30 having a rectangular wave cross section at left and right alternating side end positions, and the folded surface of the corrugated plate 30 is joined to the plates 21 and 22 to be inside the box body 20. The box body 20 is folded back alternately at the side edges of the box body 20, the inside of the box body 20 is partitioned by the wall surface 32 of the corrugated plate 30, and opens from the inlet 23 opened to the periphery of the box body 20 to a position facing the inlet 23. Forming a meandering fluid path to the outlet 24;
The narrow tube 10 in which the other fluid flows is branched into two paths, and the narrow tubes 12 and 13 of each path are arranged so that the other fluid faces one fluid flow and from one side end side of the box 20. A heat exchanger characterized by meandering in a serpentine shape so as to circulate to the other side end and being joined to both flat surfaces of the box 20. The heat exchanger according to claim 1 or 2 , wherein a plurality of thin tubes 10 are closely juxtaposed to form a passage for the other fluid . The heat exchanger according to claim 1, 2 or 3, wherein one fluid is water and the other fluid is a refrigerant . The heat exchanger according to claim 1, 2, 3, or 4 , wherein the constituent members are made of a copper material, and the assembly is brazed in a heating furnace .

Images