JPH0545491U - Pipe structure of heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] The pipe joint exerts a buffering effect against repeated bending forces, and even if the refrigerant supply copper pipe receives vibration from the refrigeration compressor and this vibrates, it is possible to prevent stress cracking at the connection part. it can. A titanium pipe 9 side of a pipe joint 7 in which a copper pipe 8 and a titanium pipe 9 are polymerized and brazed to the end of the titanium pipe 1 of a heat exchanger formed by bending a titanium pipe into a coil shape. Are polymerized and welded, and the copper pipe 8 side of the pipe joint 7 is brazed to the coolant supply copper pipe 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint structure of a heat exchanger formed by bending a titanium pipe into a coil shape.

[0002]

[Prior Art]

 Titanium tube heat exchangers are used in cages and fisheries, and in applications requiring corrosion resistance to seawater such as chemical equipment. When this titanium pipe heat exchanger is installed on site, it is necessary to connect a copper pipe for supplying refrigerant to the end of the titanium pipe, and a flare joint (mechanical connection method) has been used for such connection.

FIG. 4 shows such a flare joint. In the figure, 1 is a titanium pipe on the heat exchanger side, 2 is a copper pipe as a refrigerant supply copper pipe, and a brass pipe with a screw carved on the outer periphery. The joint 3 is arranged between the titanium pipe 1 and the copper pipe 2, and the bag-shaped nuts 4 screwed on both sides of the pipe joint 3 are used to form the titanium pipe 1 end and the pipe joint 3 end, and the copper pipe 2 end and the pipe. Tighten and join the 3 ends of the joint. The ends of the titanium pipe 1 and the copper pipe 2 are expanded in a trumpet shape so as to overlap with the end of the pipe joint 3, and a copper packing 5 is provided between the end of the titanium pipe 1 and the end of the pipe joint 3. And a sealing agent is interposed. The copper packing 5 and the sealing agent are for improving the familiarity between the brass pipe joint 3 side and the titanium pipe 1 side.

[0004]

[Problems to be solved by the device]

 By the way, the heat exchanger made of titanium pipe is connected to the refrigerating compressor via the copper pipe 2 for supplying refrigerant, and the copper pipe 2 for supplying refrigerant also receives vibration from the refrigerating compressor, which also vibrates, and the heat exchanger made of titanium pipe makes heat exchange. Bending force repeatedly acts on the connection between the container and the copper pipe 2. Therefore, in the flare joint as described above, there is a possibility that stress cracking may occur repeatedly due to connection at one point.

In particular, if the nut 4 is over-tightened in the field work, cracking trouble may occur in the pipe joint 3 and the nut 4, and it may promote the repeated stress cracking.

An object of the present invention is to provide a pipe joint structure for a heat exchanger that eliminates the disadvantages of the conventional example and can cope with vibration and prevent stress cracking.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a titanium pipe end which is formed by bending a titanium pipe into a coil shape, and a titanium pipe end portion of a heat exchanger which is a brazed joint of a copper pipe and a titanium pipe. The gist is to superpose and weld the pipe side and braze the copper pipe side of this pipe joint to the coolant supply copper pipe.

[0008]

[Action]

 According to the present invention, the pipe joint comprises a copper pipe portion and a titanium pipe portion that are polymerized and brazed together, and the titanium pipe side of the pipe joint is polymerized and welded to the titanium pipe end of the heat exchanger. Therefore, this pipe joint exerts a buffering effect against repeated bending forces.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional side view showing an embodiment of a pipe joint structure of a heat exchanger of the present invention, FIG. 2 is a plan view of a titanium pipe heat exchanger using the pipe joint structure of the present invention, and FIG. It is a figure.

Reference numeral 6 in the figure is a titanium tube heat exchanger, which is formed by bending a titanium tube into a coil shape as in the conventional case.

Reference numeral 7 in the drawing denotes a pipe joint according to the present invention, which is formed by superposing a copper pipe 8 and a titanium pipe 9 and brazing and joining them together. Although not shown, one end of the copper pipe 8 was flared to expand the diameter, and the end of the titanium pipe 9 was inserted into the expanded end and connected by TIG welding in an inert atmosphere.

The end of the pipe joint 7 on the titanium pipe 9 side is flared to expand its diameter, and the end of the titanium pipe 1 of the titanium pipe heat exchanger 6 is inserted into this portion to weld the overlapping portion. The pipe joint 7 and the titanium pipe heat exchanger 6 may be connected by TIG welding at the factory.

The titanium pipe heat exchanger 6 to which such a pipe joint 7 is connected in advance is carried into the site, the end of the copper pipe 8 of the pipe joint 7 and the refrigerant supply copper pipe 2 are polymerized, and brazing is performed in the field. Suru

[0014]

[Effect of the device]

 As described above, in the pipe joint structure of the heat exchanger of the present invention, the pipe joint exerts a buffering effect against bending force repeatedly, and even if the refrigerant supply copper pipe receives vibration from the refrigeration compressor, it vibrates. It is possible to prevent stress cracking of the connecting portion.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a pipe joint structure of a heat exchanger of the present invention.

FIG. 2 is a plan view of a titanium pipe heat exchanger using the pipe joint structure of the present invention.

FIG. 3 is a front view of a titanium pipe heat exchanger using the pipe joint structure of the present invention.

FIG. 4 is a vertical sectional side view showing a conventional example.

[Explanation of symbols]

1 ... Titanium pipe 2 ... Copper pipe 3 ... Pipe joint 4 ... Nut 5 ... Copper packing 6 ... Titanium pipe heat exchanger 7 ... Pipe joint 8 ... Copper pipe 9 ... Titanium pipe

Claims (1)

[Scope of utility model registration request] 1. A titanium pipe end of a heat exchanger formed by bending a titanium pipe into a coil shape is polymerized with a copper pipe and a titanium pipe by brazing and joining the titanium pipe side of a pipe joint. Welded,
A pipe joint structure for a heat exchanger, characterized in that the copper pipe side of this pipe joint is brazed to a coolant supply copper pipe.