JP2005127684A - Double tube type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compactly manufactured double tube type heat exchanger with easy incorporation into an apparatus, allowing usage of a small diameter tube by extensively reducing a pressure loss of fluid in regard to a double tube type heat exchanger with an inner tube 15 inserted through an outer tube 12, carrying out heat exchange between fluid passing through the inner tube 15, and fluid passing between the inner tube 15 and the outer tube 12. <P>SOLUTION: It is characterized by that a plurality of double tubes 10 with the inner tube 15 inserted through the outer tube 12 are arranged in parallel with each other, and in its end part, an inner side header tube 20 is joined and communicated with the outer tube 12, and the inner tube 15 piercing the inner side header tube 20 is joined and communicated with an outer side header tube 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a double-tube heat exchanger that exchanges heat between a fluid that passes through an inner tube and flows through the inner tube and a fluid that flows between the inner tube and the outer tube. In particular, the present invention relates to a double-pipe heat exchanger applied to a heat pump type water heater or a heater using a refrigerant.

  Double pipe heat exchange with two pipes (outer pipe, inner pipe) with different diameters and inner pipe inserted into the outer pipe as a heat exchanger built into a heat pump water heater or heater using refrigerant There is a vessel. This is a system in which a high-temperature and high-pressure refrigerant flows through the inner pipe, and the water flowing between the inner pipe and the outer pipe is heated to supply hot water.

  In the double-tube heat exchanger having such a configuration, in order to obtain a predetermined hot water supply capacity, the heat transfer area must be increased, resulting in an extremely long double tube. For this reason, in order to be incorporated in the device, it has been necessary to bend or toggle and form it into a predetermined outer shape, which makes it difficult to make it compact. In addition, since the pressure loss of the fluid (refrigerant, water) increases as the overall length becomes longer, a large-diameter tube must be used, and the small-diameter tube has excellent pressure resistance against high-pressure refrigerant. Could not be used.

  The problem to be solved by the present invention is to make it possible to use a small-diameter pipe by greatly reducing the pressure loss of the fluid, and to make a double-pipe heat exchange that is extremely compact and easy to install in equipment. Is to provide a vessel.

  In order to solve these problems, the double-tube heat exchanger of the present invention includes an inner tube 15 inserted into the outer tube 12, a fluid flowing through the inner tube 15, and the inner tube 15 and the outer tube 12. In a double-pipe heat exchanger that exchanges heat with the fluid that flows between them, a plurality of double pipes 10 inserted through the inner pipe 15 in the outer pipe 12 are juxtaposed in parallel. The inner header pipe 20 is joined to allow the outer pipe 12 to communicate, and the inner pipe 15 penetrating the inner header pipe 20 is joined to the outer header pipe 22 to communicate with each other.

  Further, the present invention is particularly applicable to a double-pipe heat exchanger using a refrigerant in which a high-temperature and high-pressure refrigerant flows through the inner pipe 15 and water flows between the inner pipe 15 and the outer pipe 12.

  The double-tube heat exchanger of the present invention is manufactured by forming the constituent members using copper or a copper alloy and brazing them with an electric furnace.

  In the double pipe heat exchanger of the present invention, a plurality of double pipes 10 each having an inner pipe 15 inserted in the outer pipe 12 are juxtaposed in parallel, and the outer pipe 12 and the inner pipe are connected to the header pipes 20 and 22 at their ends. Since the pipe 15 is made to communicate with each other, the heat transfer area is dramatically increased as compared with the conventional double pipe heat exchanger constituted by a single double pipe, and the flow path is made parallel by the fluid passage. The pressure loss is greatly reduced, and it is possible to use a small-diameter pipe excellent in pressure resistance, and it is manufactured in an extremely compact manner and can be easily incorporated into equipment.

  In addition, by using a small-diameter pipe excellent in pressure resistance, it is particularly applicable to a double-pipe heat exchanger using a refrigerant in which a high-temperature and high-pressure refrigerant circulates in the inner pipe 15, and the constituent member is made of copper or a copper alloy. The assembly is put into an electric furnace and brazed, and the productivity is excellent.

The drawing shows a specific embodiment of the double tube heat exchanger of the present invention.
1 and 2 show the first embodiment, using two copper pipes (outer pipe 12 and inner pipe 15) having different diameters, a high-temperature and high-pressure refrigerant flows through the inner pipe 15, and the inner pipe 15 and the outer pipe. This is a double tube heat exchanger in which water flows between the tubes 12. As shown in the figure, a plurality of double pipes 10 having inner pipes 15 inserted in the outer pipe 12 are juxtaposed in parallel, and inner header pipes 20 (copper pipes) are joined at the ends thereof. The header pipe 20 communicates. The inner pipe 15 penetrates the inner header pipe 20 and communicates with an outer header pipe 22 (copper pipe) disposed outside the inner header pipe 20 with its end joined.

  Caps 21 and 23 are joined to one end of the inner header pipe 20 and the outer header pipe 22, and the open end of the other end serves as a fluid inlet / outlet port. The refrigerant and water inlet / outlet ports are set as indicated by arrows in the figure so that the water flow direction and the refrigerant flow direction cross each other. The water flowing in from one inner header pipe 20 is heated by the high-temperature refrigerant flowing through the inner pipe 15 while flowing through each double pipe 10, and discharged from the other inner header pipe 20. In this way, the heat transfer area is dramatically increased by arranging the flow passages in parallel.

  This double-pipe heat exchanger is manufactured by installing brazing material in a predetermined position, putting the assembly into an electric furnace, and brazing each joint, and it is a flat shape with a total length of several tens of centimeters to several meters Formed. It can be formed into a shape according to the installation space of the device to be incorporated, such as being bent in the middle to be formed into an L shape and then bent at both ends to be formed into a U shape.

  FIG. 3 shows another embodiment of the double-pipe heat exchanger according to the present invention. The double pipe heat exchanger of this example joins the inner header pipe 20 to the end of the double pipe 10 through which the inner pipe 15 is inserted into the outer pipe 12, The inner header pipe 20 is connected to the other inner header pipe 20 in one circuit. Then, one outer header pipe 22 is divided into two, a cap 23 is joined to both ends of the other outer header pipe 22, an inlet pipe 24 is joined to the center, and the refrigerant flowing from the inlet pipe 24 is divided inside The refrigerant circuit is constituted by two circuits so as to be discharged from the header pipe 20.

  FIG. 4 shows still another embodiment of the double tube heat exchanger of the present invention. In the double-tube heat exchanger of this example, one inner header pipe 20 and outer header pipe 22 are divided into two, and the other inner header pipe 20 and outer header pipe 22 are constituted by one, water and The refrigerant is configured to circulate at the other end. Thus, by forming the double pipe 10 in a meandering manner so that the plurality of the double pipes 10 are sequentially folded at the ends, the overall length of the flow path is set long while setting the width of the heat exchanger small. be able to.

  1 is a plan view of a first embodiment of the present invention. .   Sectional drawing cut | disconnected by AA in FIG.   The top view of another Example.   The top view of other Example.

Explanation of symbols

10 Double pipe 12 Outer pipe 15 Inner pipe 20 Inner header pipe 22 Outer header pipe

Claims (3)

Double tube heat exchange in which the inner tube 15 is inserted into the outer tube 12 and heat is exchanged between the fluid flowing through the inner tube 15 and the fluid flowing between the inner tube 15 and the outer tube 12. In the vessel
A plurality of the double pipes 10 having the inner pipe 15 inserted in the outer pipe 12 are juxtaposed in parallel. At the end, the inner header pipe 20 is joined to allow the outer pipe 12 to communicate, and the inner header pipe 20 is penetrated. A double pipe heat exchanger characterized in that the inner pipe 15 is joined to and communicated with the outer header pipe 22.   The double-pipe heat exchanger according to claim 1, wherein a high-temperature and high-pressure refrigerant flows through the inner pipe 15 and water flows between the inner pipe 15 and the outer pipe 12.   The double-tube heat exchanger according to claim 1 or 2, wherein the constituent members are made of copper or a copper alloy and brazed with an electric furnace.

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