JPS5842788Y2 - Shell-and-tube heat exchanger - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a multi-tube heat exchanger installed inside a hot air loosening machine having a combustion device. In devices that efficiently transfer the heat of high-temperature fluid flowing inside the pipe to the pipe wall, the inner fins swing inside the pipe due to vibrations, etc., producing a chattering sound. This is what I did.

Conventionally, in multi-tube heat exchangers in which inner fins are inserted inside, the inner fins are only connected to the inner wall of the tubes at the ends of the tube surfaces, creating gaps inside for assembly.
Chattering noise may occur inside the heat exchanger due to the vibration of the heater body that occurs when the heater is operating.

This invention was devised in view of the above-mentioned drawbacks, and one embodiment of this invention will be described with reference to FIGS. 1 and 2.

In the figure, 1 is the outer casing of the heater body, 2 is the combustor, 3 is the multi-tubular heat exchanger, 4 is the exhaust gas collection chamber, 5 is the inner fin disposed inside the pipe A of the heat exchanger, and 6 is the inner fin installed in the pipe A of the heat exchanger. A hot air blower blows indoor air to the combustion machine and the heat exchanger, 7 is a combustion blower, and 8 is a burner.

FIG. 2 is an enlarged view of the inner fin before it is inserted into the pipe A.

This inner fin is formed with meandering undulations and is forcibly compressed into each pipe of the heat exchanger, the undulations are corrected when inserted, and the resulting elasticity fixes it to the inner wall of the pipe to prevent it from swinging due to vibration. ing.

Since the inner fin is press-fitted into the pipe and fixed in this way, it is possible to prevent chattering noise from occurring due to vibration.

FIG. 3 shows a different embodiment, in which a pressing member 9 made of an elastic body fixed to the inner wall of the exhaust gas collecting chamber 4 constantly presses the protruding part 11 protruding from the end of the heat exchange pipe of the inner fin, and It is also possible to prevent directional rocking, and with this structure, it is possible to further reduce chatter noise caused by vibration.

FIG. 4 shows a further different embodiment, in which a spring 12 is provided so that the side wall of the exhaust gas collecting chamber always presses the protrusion of the inner fin in the insertion direction, and the exhaust gas collecting chamber is configured to always contract in the longitudinal direction. This is what I did.

Even with this configuration, the same effects as above can be obtained.

As explained above, this invention consists of forming the inner fin into a spiral shape using a flat plate, forming elastic undulations in the insertion direction, and press-fitting the inner fin into the pipe.The inner fin is pressed into contact with the inner wall of the pipe. It does not shake and has the effect of eliminating chattering noise caused by blower operation, etc.

[Brief explanation of drawings]

Fig. 1 is a structural diagram of a hot air heater incorporating a heat exchanger according to one embodiment of this invention, Fig. 2 is a detailed view of the inner fin, and Fig. 3 is a main part showing a different embodiment of this invention. Enlarged cross-sectional view,
FIG. 4 is an enlarged sectional view of a main part showing a further different embodiment. In addition, the same reference numerals in the drawings indicate the same or equivalent parts, 1 is the outer casing, 2 is the combustion tube, 3 is the heat exchanger, 4 is the exhaust gas collection chamber, 5 is the inner fin, and 9 is the pressing member made of an elastic body. be.

Claims (1)

[Scope of utility model registration request] In a multi-tubular heat exchanger that has multiple pipes with inner fins inserted, a primary fluid is passed through the pipes, and a secondary fluid is blown onto the pipes to exchange heat, the inner fins are formed into a flat plate in a spiral shape. At the same time, the multi-tubular heat exchanger is press-fitted into the pipe and has elastic undulations extending along its entire length in the insertion direction.