JP2010223568A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of improving assembling workability and productivity, and reducing manufacturing costs, with respect to the heat exchanger in which a circulation passage of one of heat exchanging fluids is composed of a capillary tube. <P>SOLUTION: In this heat exchanger in which the circulation passage of one of heat exchanging fluids is composed of the capillary tube 10, a circulation passage of the other fluid is composed of a tubular body 20, and both tubes 10, 20 are kept into contact with each other, both tubes 10, 20 are spirally formed by being coiled, diameters of the coils are respectively determined so that the capillary tube 10 is kept into contact with an outer peripheral face or an inner peripheral face of the tubular body 20, both tubes 10, 20 are inserted from an opening end of the spiral and assembled, and the assembly is brazed in a heating furnace to be joined. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a heat exchanger in which a flow path of one fluid for heat exchange is formed by a capillary tube (copper thin tube).

  There is a heat exchanger in which a flow path of a high-temperature and high-pressure gas refrigerant is formed by a capillary tube, such as a heat exchanger for a heat pump type hot water heater using a refrigerant. The heat exchanger for the heat pump type hot water heater has a structure that can withstand high-pressure refrigerant by using a capillary tube, and exchanges heat between the primary side through which the gas refrigerant flows and the secondary side through which water of the fluid to be heated flows. Water is supplied by heating water.

  Conventionally, as such a heat exchanger, there is a structure in which a capillary tube and a pipe body through which water flows are coiled and formed into a spiral shape and brought into contact with each other, and the main part thereof is shown in FIG. As shown in the figure, this heat exchanger has a sandwich structure in which a capillary tube 1 is vertically sandwiched by a tube 2 with the coiled capillary tube 1 and the tube 2 in contact with each other. is there. In addition, there has also been proposed a flat tube that is used as the tube body 2 to increase the contact area, thereby increasing the heat transfer area contributing to heat exchange.

  The heat exchanger of the conventional structure shown in the drawing is manufactured by entangled a coiled capillary tube 1 and a tube body 2, and puts the assembly into a heating furnace and brazes it. In this manufacturing process, the operation of making the sandwich structure by tying the capillary tube 1 to the tube body 2 so that both the tubes 1 and 2 are in contact with each other is extremely complicated and laborious, and the assembly workability is remarkably inferior. The production cost was expensive.

  The present invention relates to a heat exchanger in which a flow path of one fluid to be heat-exchanged is formed by a capillary tube, and an object thereof is to propose a heat exchanger that improves assembly workability and productivity and is inexpensive to manufacture. To do. Another object of the present invention is to propose a heat exchanger with a new configuration that is small and excellent in thermal efficiency by increasing the heat transfer area between one fluid flowing through the capillary tube and the other fluid that exchanges heat with the fluid. Is.

  In order to achieve such an object, in the heat exchanger of the present invention, one fluid flow passage for heat exchange is formed by the capillary tube 10, and the other fluid flow passage is formed by the tube body 20. In the heat exchanger in which 20 is in contact with each other, both the tubes 10 and 20 are coiled to form a spiral shape, and the capillary tube 10 is in contact with the outer peripheral surface or inner peripheral surface of the tube body 20. Set the coil diameter. And it is the person characterized by inserting both the pipes 10 and 20 from the opening end of the spiral and assembling them, and brazing and joining the assembly in a heating furnace.

  Moreover, in the heat exchanger comprised in this way, the tubular body 20 is formed with a flat tube, and the contact area is increased.

  The heat exchanger according to the present invention is formed in a spiral shape by winding the capillary tube 10 and the tube body 20 in a coil, and the tubes 10 and 20 are inserted through the open ends of the spiral, and can be assembled very easily. Is put into a heating furnace and brazed, and the capillary tube 10 is joined to the outer peripheral surface or inner peripheral surface of the tube body 20. Therefore, it is excellent in assembling workability and productivity, and can be assembled with a simple jig without requiring any special equipment, and the manufacturing cost can be greatly reduced as compared with a heat exchanger having a conventional structure.

  In addition, since the capillary tube 10 and the tube body 20 are coiled and formed in a spiral shape, the flow paths for both fluids for heat exchange are formed extremely long, and the outer peripheral surface or inner peripheral surface of the tube body 20 is formed. Since the capillary tube 10 comes into contact with the entire surface, the heat transfer area between one fluid flowing through the capillary tube and the other fluid exchanging heat with the fluid can be dramatically increased, and the thermal efficiency is extremely excellent.

  In addition, the heat exchanger of the present invention is formed in a compact cylindrical shape, is excellent in handling such as installation in a heat-related device, and can correspond to the specifications of various devices by setting the outer diameter and length of the cylindrical body. Yes, it is easy to apply modularization and connecting a plurality of them in series or in parallel according to the required capacity.

  Moreover, the contact area can be increased by forming the tube body 20 as a flat tube, and the heat transfer area contributing to heat exchange can be further increased.

Sectional drawing of 1st Example of this invention. Explanatory drawing which shows an assembly method. The expanded sectional view of the principal part. The expanded sectional view of the principal part of 2nd Example. The expanded sectional view of the principal part of a prior art example.

  In the following, specific embodiments of the present invention will be described based on examples of the drawings.

  The heat exchanger shown in FIGS. 1 to 3 is the first embodiment of the present invention, wherein the flow path of the high-temperature and high-pressure gas refrigerant is formed by the capillary tube 10 and the flow path of the water to be heated is the tube body 20. It is a heat exchanger that is formed and built into a heat pump hot water heater using a refrigerant. A flat tube having a substantially rectangular cross section is used for the tube body 20, and the capillary tube 10 and the tube body 20 are formed in a spiral shape by being coiled, and the capillary tube 10 is joined to the outer peripheral surface of the tube body 20.

  An inlet header 12 is provided at one end of the capillary tube 10, and an outlet header 13 is provided at the other end. A gas refrigerant flow path from the inlet header 12 to the outlet header 13 is formed. Is provided with an outlet pipe 23, and a water flow path from the inlet pipe 22 to the outlet pipe 23 is formed. As shown by the arrows in FIG. 1, the flow directions of both are reversed, and the gas refrigerant and water cross and circulate. A heat insulating material 15 for preventing thermal drafting is provided on the outer periphery of the capillary tube 10 as necessary.

  In this heat exchanger, the diameters of the coils of the capillary tube 10 and the tube body 20 are set so that the capillary tube 10 abuts on the outer peripheral surface of the tube body 20. Then, as shown in FIG. 2, both pipes 10 and 20 are inserted from the open ends of the spiral, and an inlet header 12, an outlet header 13, an inlet pipe 22 and an outlet pipe 23 are provided at the respective pipe ends. It is manufactured by installing and assembling, putting the assembly fixed with a predetermined jig into the heating furnace, and brazing.

  FIG. 4 shows another embodiment of the present invention in which a capillary tube 10 and a tube body 20 are coiled to form a spiral shape, and the capillary tube 10 is joined to the inner peripheral surface of the tube body 20. In this heat exchanger, the diameters of the coils of the capillary tube 10 and the tube body 20 are set so that the capillary tube 10 abuts on the inner peripheral surface of the tube body 20, and both the tubes 10, 20 are connected from the opening end of the spiral. The assembly is inserted and assembled, and as in the previous example, the assembly is manufactured by brazing in a heating furnace. In the case of this example, since the flow path of the water to be heated is outside, the thermal draft is reduced, and the heat insulating material 15 may be unnecessary.

  In the embodiment, the capillary tube 10 is bonded to one of the outer peripheral surface and the inner peripheral surface of the tube body 20, but the capillary tube 10 is bonded to both surfaces, and the flow of fluid flowing through the capillary tube 10 is formed in parallel. You can also. The fluid for heat exchange is not limited to gas refrigerant and water, and the heat exchanger of the present invention can be applied to various heat-related devices such as heating, heat absorption, and cooling.

10 Capillary tube 20 Tube

Claims (2)

In a heat exchanger in which one fluid flow passage for heat exchange is formed by the capillary tube 10 and the other fluid flow passage is formed by the tube body 20, and both the tubes 10 and 20 are in contact with each other,
Both tubes 10 and 20 are coiled to form a spiral shape, and the diameter of each coil is set so that the capillary tube 10 abuts on the outer peripheral surface or inner peripheral surface of the tube body 20;
A heat exchanger characterized in that both pipes 10 and 20 are inserted and assembled from the open end of the spiral, and the assembly is brazed in a heating furnace and joined.   The heat exchanger according to claim 1, wherein the tubular body 20 is formed of a flat tube.

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