JP2011179748A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce stress applied to a support member provided in a hanger pipe in a heat exchanger. <P>SOLUTION: A support hole 20 has an oblong hole shape long in the vertical direction. A vertical tip 3b of the support member 3 is bent and is smoothly connected to the peripheral face of the hanger pipe 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat exchanger.

Conventionally, a boiler is used that includes a combustion chamber that generates high-temperature combustion gas by burning fuel and a heat exchanger that transfers heat from the combustion gas to a fluid (water, air, etc.).
The heat exchanger has a plurality of heat transfer tubes that extend in the horizontal direction and allows fluid to flow, and a hanger tube that extends in the vertical direction and flows the fluid while supporting the plurality of heat transfer tubes. As a configuration in which the hanger tube supports a plurality of heat transfer tubes, as shown in Patent Document 1, a support member is provided on the hanger tube, the predetermined heat transfer tube is supported from below by the support member, and the predetermined heat transfer tube is provided. A plurality of heat transfer tubes are sequentially stacked on the upper side of each via a connecting member.

  However, in the configuration shown in Patent Document 1, it is necessary to provide connection members (for example, support seats and leg members) to the plurality of heat transfer tubes, respectively, by welding or the like, resulting in great effort and cost. Therefore, a configuration is used in which a pair of hanger tubes are provided with a long support member extending in the vertical direction by welding or the like, and a plurality of heat transfer tubes are sandwiched and supported by the pair of support members. According to this configuration, since the plurality of heat transfer tubes can be collectively supported by the support member, it is possible to reduce labor and cost for manufacturing the heat exchanger.

JP-A-8-226606

By the way, in a heat exchanger, of course, the temperature difference between the inner side and the outer side of a heat exchanger tube is large. For this reason, the said supporting member provided in a heat exchanger tube has a large temperature difference with the side which closely_contact | adheres to a heat exchanger tube, and the side which is not so, and will receive a big thermal stress resulting from a thermal expansion difference.
When the support member receives a large thermal stress, the support member is rapidly deteriorated, and frequent maintenance of the support member is required. Therefore, it is difficult to mount the support member on a large boiler.

  This invention is made | formed in view of the problem mentioned above, and it aims at reducing the stress which acts on the support member provided in a hanger pipe | tube in a heat exchanger.

  As means for solving the above-mentioned problems, the present invention provides a heat transfer tube extending in the horizontal direction, a hanger tube that is a heat transfer tube extending in the vertical direction, and provided in the hanger tube and extending in the horizontal direction. A heat exchanger that supports the existing heat transfer tube, and inserts and supports the heat transfer tube extending in the horizontal direction in a support hole formed by a pair of opposing support members, the support hole Has a long hole shape that is long in the vertical direction, and the vertical tip end portion of the support member is curved and smoothly connected to the peripheral surface of the hanger tube.

  According to the present invention, the support hole into which the heat transfer tube extending in the horizontal direction is inserted is a long hole that is long in the vertical direction, and the tip end portion in the vertical direction of the support member is curved to be smooth with respect to the peripheral surface of the hanger tube. Therefore, the stress acting on the support member can be reduced.

It is sectional drawing which expands and shows typically a part of heat exchanger in one Embodiment of this invention. It is a graph which shows the stress which acts on a support member before improvement and improved shape.

  Hereinafter, an embodiment of a heat exchanger according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

FIG. 1 is a cross-sectional view schematically showing an enlarged part of the heat exchanger of the present embodiment.
As shown in this figure, the heat exchanger 10 includes a heat transfer tube 1 extending in the horizontal direction, a heat transfer tube extending in the vertical direction (hereinafter referred to as a hanger tube 2), and a support attached to the hanger tube 2. And a member 3.

A fluid serving as a heat transfer medium flows inside the heat transfer tube 1 and the hanger tube 2. As shown in FIG. 1, a plurality of heat transfer tubes 1 are arranged in the vertical direction.
These heat transfer tubes 1 are supported by a support member 3 attached to the hanger tube 2.

The support member 3 is provided for each of the adjacent hanger tubes 2 and is disposed to face each other.
The support member 3 includes groove portions 3a on the surfaces facing each other. By supporting the groove portions 3a formed in the opposing support member 3 to face each other, a support hole 20 into which each heat transfer tube 1 is inserted is formed. The support hole 20 is a long hole that is long in the vertical direction. Each heat transfer tube 1 is supported by being inserted into the support hole 20.

Moreover, the front-end | tip part 3b (only one side is shown in FIG. 1) of the both sides in the perpendicular direction of the support member 3 has the curved shape dented to the hanger pipe 2 side, and is smoothly connected with the surrounding surface of the hanger pipe 2. Has been.
The support member 3 is connected to the hanger tube 2 by welding. And the front-end | tip part 3b of the supporting member 3 is easily bent by welding the front-end | tip part 3b of the supporting member 3 beforehand with respect to the surrounding surface of the hanger pipe 2 by curving this front-end | tip part 3b. The hanger tube 2 can be smoothly connected to the peripheral surface. Further, the tip portion 3 b of the support member 3 may be smoothly connected to the peripheral surface of the hanger tube 2 by performing machining or the like after welding.

  According to the heat exchanger 10 of this embodiment as described above, the support hole 20 is a long hole that is long in the vertical direction. For this reason, compared with the conventional heat exchanger whose support hole 20 is a perfect circle shape, in the heat exchanger 10 of this embodiment, the surface area seen from the extending direction of the heat exchanger tube 1 will decrease. Since most of the heat input from the external space to the support member 3 is via the surface viewed from the extending direction of the heat transfer tube 1, according to the heat exchanger 10 of this embodiment, the support member The amount of heat input from the external space to 3 can be reduced. Therefore, the temperature difference between the side that is in close contact with the hanger tube 2 and the side that is not so can be reduced to reduce the thermal stress due to the difference in thermal expansion in the support member 3.

  Moreover, according to the heat exchanger 10 of this embodiment, since the front-end | tip part 3b of the supporting member 3 is smoothly connected with respect to the surrounding surface of the hanger pipe 2, the front-end | tip part of a supporting member is the surrounding surface of a hanger pipe. The stress acting on the tip 3b can be reduced as compared with the conventional heat exchanger that is bent and connected.

  As described above, according to the heat exchanger 10 of the present embodiment, it is possible to reduce the stress acting on the support member 3 provided in the hanger tube 2.

  FIG. 2 is a graph comparing the stresses acting on the support member before improvement (conventional heat exchanger) and improved shape (heat exchanger of this embodiment). As shown in this figure, it can be seen that the stress acting on the support member is reduced in the case of the improved shape both in the periphery of the groove portion forming the support hole and in the tip portion in the vertical direction.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 10 ... Heat exchanger, 20 ... Support hole, 1 ... Heat transfer tube, 2 ... Hanger tube, 3 ... Support member, 3a ... Groove part, 3b ... Tip part

Claims (1)

A heat transfer tube extending in the horizontal direction; a hanger tube that is a heat transfer tube extending in the vertical direction; and a support member that is provided on the hanger tube and supports the heat transfer tube extending in the horizontal direction. A heat exchanger for supporting the heat transfer tube extending in the horizontal direction by inserting it into a support hole formed by a pair of support members,
The support hole has a long hole shape that is long in the vertical direction,
A heat exchanger, wherein a vertical tip end portion of the support member is curved and is smoothly connected to a peripheral surface of the hanger tube.

Images