JP3100937U - Multi-tube module heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress a vibration or abrasion of a corrugated tube by reliably supporting a corrugated tube made of titanium or stainless steel with a baffle plate in a multi-tube module heat exchanger. By appropriately determining the axial length of the corrugated portion of the corrugated tube as the heat transfer tube, vibration of the corrugated tube and a decrease in heat exchange efficiency are suppressed.
SOLUTION: A smooth tube portion 22 formed in a corrugated tube 2 made of titanium or stainless steel is inserted into a hole portion 51 of a baffle plate 5, and the length of the smooth tube portion 22 is set to the axis of the hole portion 51 of the baffle plate 5. By making the length longer than the length, the displacement between the smooth tube portion 22 and the baffle plate 5 is absorbed. The axial length L1 of the corrugated portion 21 is set to 0.5 to 3.5 times the inner diameter D of the shell 1. The crest height h of the corrugated portion 21 of the corrugated tube 2 is set to 1 to 20% of the inner diameter H at the top of the crest.
[Selection diagram] Fig. 1

Description

  The present invention provides a multi-tubular module heat exchanger, in which a second fluid passage formed by a group of corrugated tubes is provided inside a shell forming a first fluid passage, and a shaft inside the shell is provided. The present invention relates to a multitubular module heat exchanger in which baffle plates for meandering the first fluid passage are provided at a plurality of locations in a direction.

  Japanese Patent Application Laid-Open No. 9-229579 discloses a multi-tube heat exchanger (multi-tube module heat exchanger). The multi-tubular heat exchanger described in this publication includes a shell (body) forming a first fluid passage, and a second corrugated tube (heat transfer tube) having a spiral groove formed therein. Fluid passages are provided, and the corrugated tubes are individually inserted into a plurality of holes formed in a baffle plate provided at a plurality of axial positions inside the shell and meandering the first fluid passage. ing. This publication also describes that the first fluid passage is meandered by a plurality of baffle plates. Further, this publication describes that a pipe made of titanium or stainless steel can be used for the corrugated pipe, and that a place where the baffle plate in the corrugated pipe is inserted into the above-mentioned hole has a smooth outer surface without irregularities. It is suggested that it is formed as a tube.

  On the other hand, according to the multi-tubular module heat exchanger as described in the above publication, generally, the fluid in the corrugated pipe begins to flow along the groove formed in the pipe wall, and the stirring effect due to the turbulent motion is generated. It has been conventionally known that the flow rate is increased, so that the flow velocity in contact with the pipe wall is increased, the formation of a barrier film that hinders heat transfer is suppressed, and the heat transfer performance is improved.

  However, the above publication does not describe the relationship between the length of the smooth tube portion of the corrugated tube and the axial length of the hole of the baffle plate through which the smooth tube portion is inserted.

  By the way, when manufacturing a tube in which a smooth tube portion is formed at a plurality of positions in the axial direction of a corrugated tube whose outer surface is formed in a corrugated shape by a helical groove or the like, due to a problem in manufacturing technology, smoothing in the axial direction of the corrugated tube is required. In order to determine the position of the tube part with high precision, high technology is required and the production cost becomes extremely high, so in general, the position accuracy of the smooth tube part is often not determined so high . In such a case, for example, in order to improve the heat exchange efficiency by increasing the agitating effect due to the turbulent motion described above by making the corrugated portion, which is a portion other than the above-mentioned corrugated tube forming portion of the corrugated tube, as long as possible. If the length of the smooth tube portion is set to be equal to the axial length of the hole portion of the baffle plate, the smooth tube portion may not necessarily be positioned depending on the hole portion of the baffle plate due to the displacement of the smooth tube portion of the manufactured corrugated tube. Unsupported situations occur, in which case the corrugations become supported by the holes in the baffle plate. When the corrugated portion is supported by the holes of the baffle plate, bending and vibration of the corrugated tube made of titanium or stainless steel are sufficiently suppressed by the baffle plate during operation of the heat exchanger. In addition, there is a problem that the support stability and the support reliability of the corrugated tube are impaired, and there is a problem that the corrugated tube may be significantly worn at a portion where the baffle plate is inserted into the hole.

  The present invention has been made in view of the above-mentioned problems, and has been developed in such a manner that a corrugated tube made of titanium or stainless steel is used as a heat transfer tube, and a smooth tube portion formed in an intermediate portion of the corrugated tube is supported by a baffle plate. In a tubular module heat exchanger, even if the location of the smooth tube part formation location is not necessarily determined with high accuracy, the baffle plate securely supports the smooth tube part of the corrugated tube and provides support stability and support for the corrugated tube. It is an object of the present invention to provide a multi-tubular module heat exchanger that can improve reliability and, at the same time, can reliably suppress wear of a corrugated pipe at a location where the baffle plate is inserted into a hole.

  In addition, the present invention suppresses the vibration of the corrugated tube and a decrease in heat exchange efficiency by appropriately determining the axial length of the corrugated portion of the corrugated tube having the smooth tube portion in the middle portion in relation to the inner diameter of the shell. It is an object of the present invention to provide a multi-tubular module heat exchanger that can be used.

  Another object of the present invention is to provide a multi-tube module heat exchanger that can suppress the vibration of the corrugated tube and the decrease in heat exchange efficiency by appropriately determining the shape of the corrugated tube.

  In the shell-and-tube module heat exchanger according to the present invention, a second fluid passage formed by a set of a large number of corrugated tubes is provided inside a shell forming a first fluid passage, and the inside of the shell is formed. A multi-tube module heat exchanger in which the corrugated tubes are individually inserted into a plurality of holes formed in a baffle plate provided at a plurality of positions in the axial direction and meandering the first fluid passage. The pipe is made of titanium or stainless steel, and the insertion point of the corrugated pipe into the hole of the baffle plate is formed as a smooth pipe having no irregularities on the outer peripheral surface, and the length of the smooth pipe is Is longer than the axial length of the hole of the baffle plate.

  With this configuration, the length of the smooth tube portion is longer than the axial length of the hole of the baffle plate, even if the positional accuracy of the formation portion of the smooth tube portion in the corrugated tube is suppressed low. The smooth tube portion is securely inserted into the hole of the baffle plate and supported by the baffle plate. Therefore, while the corrugated tube can be manufactured at low cost, the support stability and support reliability of the corrugated tube by the baffle plate are improved, and at the same time, the corrugated tube is inserted into the hole of the baffle plate at the insertion point. Wear can be reliably suppressed.

  In the present invention, the corrugated tube is provided with the smooth tube portion at at least two positions in the axial direction, and the axial length of the corrugated portion provided over the entire space between two smooth tube portions adjacent to each other in the axial direction. It is desirable that the size is 0.5 to 3.5 times the inner diameter of the cylindrical shell. According to this, the agitating effect due to the turbulent motion of the fluid inside the corrugated tube is sufficiently exerted so that the heat transfer performance does not decrease, and the interval between the support portions of the corrugated tube by the baffle plate is appropriate. The bending and vibration of the corrugated tube are sufficiently suppressed within the above range. If the axial length of the corrugated portion is shorter than 0.5 times the inner diameter of the shell, the agitating effect due to the turbulent motion of the fluid inside the corrugated tube may not be sufficiently exerted. If the axial length of the portion is longer than 3.5 times the inner diameter of the shell, the interval between the supporting points of the corrugated tube by the baffle plate becomes too wide, so that bending and vibration of the corrugated tube may not be sufficiently suppressed. .

  In the present invention, it is desirable that the axial length of the smooth tube portion is 5 to 50 mm. If the axial length of the smooth tube is set within this range, the positional accuracy of the smooth tube portion at the time of manufacturing the corrugated tube is not so high, and the assembling accuracy of the baffle plate and the corrugated tube is low. Even if the height is not so high, the smooth tube portion of the corrugated tube can be reliably supported by the baffle plate, and the abrasion of the corrugated tube at the place where the baffle plate is inserted into the hole can be reliably suppressed.

  In the present invention, it is desirable that the crest height of the corrugated portion of the corrugated tube is 1 to 20% of the inner diameter at the top of the crest of the corrugated portion. When the peak height dimension of the corrugated portion is set in this range, the fluid flowing through the second fluid passage inside the corrugated tube flows without stagnation, and the circulation efficiency is improved, and at the same time, the pressure loss of the fluid is suppressed to be small. Thus, vibration of the corrugated tube and damage due to the vibration are prevented. On the other hand, if the peak height of the corrugated portion is shorter than the above range, the stirring effect due to the turbulent motion of the fluid inside the corrugated tube may not be sufficiently exerted, and the heat exchange efficiency may be significantly reduced. If the peak height of the portion is longer than the above range, not only does the fluid stagnate and the heat exchange efficiency is reduced, but also the corrugated tube may be vibrated or damaged due to the vibration.

  As described above, according to the present invention, even if the position of the formation portion of the smooth tube portion formed in the middle portion of the corrugated tube made of titanium or stainless steel is not necessarily determined with high accuracy, the waveform is formed by the baffle plate. The support stability and support reliability for the corrugated tube can be improved by reliably supporting the smooth tube portion of the tube, and at the same time, the abrasion of the corrugated tube at the point of insertion into the hole of the baffle plate is reliably suppressed. Will be able to do it. Therefore, the service life of the corrugated tube is improved. In addition, since the axial length of the corrugated portion of the corrugated tube having a smooth tube portion in the middle portion is appropriately determined in relation to the inner diameter of the shell, and the length of the smooth tube portion is specifically specified, vibration and vibration of the corrugated tube are reduced. A decrease in heat exchange efficiency is reliably suppressed. Furthermore, since the peak height of the corrugated portion of the corrugated tube is appropriately determined, it is possible to reliably suppress the vibration of the corrugated tube, damage due to the vibration, and a decrease in heat exchange efficiency.

  FIG. 1 is a partially cutaway side view schematically showing a multitubular module heat exchanger A according to the present invention, and FIG. 2 is an explanatory view showing a place where a corrugated tube 2 is inserted into a hole 51 of a baffle plate 5. 3 is a partially cutaway side view showing a main part of the corrugated tube 2.

  In the heat exchanger A of FIG. 1, an inlet 11 and an outlet 12 of a first fluid F1 are separately provided at both ends of a body of a cylindrical shell 1 forming a first fluid passage. Are distributed to the inlet 13 and the outlet 14 of the second fluid F2. Inside the shell 1, a second fluid passage formed by an assembly of a number of corrugated tubes 2 is provided. In addition, baffle plates 5 are provided at a plurality of positions in the axial direction inside the shell 1. These baffle plates 5 are formed in a shape in which a part of a disk is cut in parallel to the diameter direction thereof, for example, a shape having a semicircular shape or a dome-shaped contour. An internal first fluid passage is open. In the two adjacent baffle plates 5, the opening of the first fluid passage inside the shell 1 is located on the opposite side of the axis of the shell 1. Therefore, the first fluid passage inside the shell 1 is formed in a meandering shape by the plurality of baffle plates 5. One end and the other end of each corrugated tube 2 forming the second fluid passage are fixed to a face plate 15 provided on one end and the other end of the shell 1.

  The corrugated tube 2 is made of titanium or stainless steel. As shown in FIG. 2 or FIG. 3, the corrugated tube 2 has a spirally formed tube wall as a whole, and a basic side view shape of the outer peripheral surface is a shape provided with corrugations. And the smooth tube part 22 which does not have unevenness in an outer peripheral surface is formed in the several places in the axial direction. More specifically, the corrugated tube 2 has a corrugated portion 21 having irregularities on the outer peripheral surface and the smoothing tube portion 22 having no irregularities on the outer peripheral surface. It is formed as a part 21.

  Although not shown, each of the baffle plates 5 has a plurality of circular holes 51 shown in FIG. The smooth tube portions 22 of the corrugated tube 2 are individually inserted into the holes 51, respectively. The length L2 of the smooth tube portion 22 (see FIG. 1) is longer than the axial length of the hole 51 of the baffle plate 5, as can be seen in FIG. For this reason, when the corrugated portion 21 and the smooth tube portion 22 are formed by drawing a straight tube made of titanium or stainless steel as a material, there is a displacement in a position where the smooth tube portion 22 is formed, or the corrugated tube 2 is displaced. Even if the assembling accuracy of the baffle plate 5 with respect to the shell 1 is slightly deviated or the assembling accuracy of the baffle plate 5 with respect to the shell 1 is slightly deviated, the baffle plate 5 has The insertion point of the corrugated tube 2 is always the smooth tube portion 22 of the corrugated tube 2. Therefore, the hole 51 of the baffle plate 5 and the smooth tube portion 22 of the corrugated tube 2 are displaced from each other and the corrugated portion 21 of the corrugated tube 2 is supported by the baffle plate 5. A situation in which the support stability and the support reliability of the corrugated tube 2 are not impaired does not occur. It is confirmed that the length of the smooth tube portion 22 capable of reliably exerting the above-described operation when adopting a general corrugated tube manufacturing technology and a general assembly accuracy is 5 to 50 mm. are doing. When the length of the smooth tube portion 22 is set in the range of 5 to 50 mm, the smooth tube portion 22 is reliably supported by the baffle plate 5, and the corrugated tube at the place where the baffle plate 5 is inserted into the hole 51 is formed. 2 can be surely suppressed.

  As described above, when the length of the smooth tube portion 22 is set in the range of 5 to 50 mm, the smooth tube portion 22 can be reliably supported by the baffle plate 5 and can be inserted into the hole 51 of the baffle plate 5 at the insertion point. Although the effect or effect that the abrasion of the corrugated tube 2 can be surely suppressed is obtained, the position of the smooth tube portion 22 is determined by the length of the corrugated portion 21 of the corrugated tube 2. is there. In addition, the corrugated portion 21 needs to be long enough to obtain the stirring effect by the turbulent motion of the fluid inside the corrugated tube 2 described at the beginning, and if the length is too short, the fluid is not sufficiently supplied. The turbulent motion may not be performed, and the heat exchange efficiency may be significantly reduced. On the other hand, if the length of the corrugated portion 21 is too long, the interval between the supporting portions of the corrugated tube 2 by the baffle plate 5 may be too large, and bending and vibration of the corrugated tube 2 may not be sufficiently suppressed. If bending or vibration of the corrugated tube 2 is not sufficiently suppressed, the corrugated tube 2 may be broken or cracked by vibration. In particular, the tendency is large when the corrugated tube 2 is made of titanium or stainless steel, which is a lightweight metal having excellent thermal conductivity.

  Therefore, the axial length L1 of the corrugated portion 21 provided over the whole of the two smooth tube portions 22 adjacent in the axial direction is set to 0.5 to 3 times the inner diameter D of the cylindrical shell 1. .5 times. If the axial length L1 of the corrugated portion 21 is set in this range, the stirring effect due to the turbulent motion of the fluid inside the corrugated tube 2 is sufficiently exerted, so that the heat transfer performance does not decrease. 5, the width of the interval between the supporting portions of the corrugated tube 2 falls within an appropriate range, and the bending and vibration of the corrugated tube 2 are sufficiently suppressed. If the axial length L1 of the corrugated portion 21 is shorter than 0.5 times the inner diameter D of the shell 1, the stirring effect due to the turbulent motion of the fluid inside the corrugated tube 2 may not be sufficiently exhibited. On the other hand, if the axial length L1 of the corrugated portion 21 is longer than 3.5 times the inner diameter D of the shell 1, the interval between the support portions of the corrugated tube 2 by the baffle plate 5 becomes too large, and the corrugated tube 2 is removed. There is a possibility that bending or vibration may not be sufficiently suppressed. For example, when the inner diameter of the corrugated tube 2 combined with the shell 1 having the inner diameter D of 48.6φ (40A) is 9.52φ, the axial length L1 of the corrugated portion 21 of the corrugated tube 2 is set to 24.3. When the inner diameter of the corrugated tube 2 combined with the shell 1 having the inner diameter D of 165.2φ (150A) is 9.52φ, it is appropriate to set the inner diameter of the corrugated tube 2 to 1.517 mm. It is appropriate to set the axial length L1 of the corrugated portion 21 in the range of 82.6 to 578.2 mm. In the embodiment, the shell 1 having an inner diameter D of 48.6φ (40A) is combined with a corrugated tube 2 having a length of 136mm and an inner diameter of 9.52φ.

  In order to improve the heat exchange efficiency by increasing the stirring effect due to the turbulent motion of the fluid inside the corrugated tube 2, the inside height of the corrugated portion 21 is determined by appropriately setting the peak height of the corrugated portion 21 of the corrugated tube 2. It is necessary that stagnation is not formed in the fluid flowing through the fluid. Therefore, the peak height h of the corrugated portion 21 of the corrugated tube 2 shown in FIG. 3 is set to 1 to 20% of the inner diameter H at the top of the corrugated portion of the corrugated portion 21. When the peak height h of the corrugated portion 21 is set in this range, the fluid flowing through the second fluid passage inside the corrugated tube 2 flows without stagnation, and the circulation efficiency is improved, and the pressure loss of the fluid is reduced. Vibration of the corrugated tube and breakage due to the vibration are prevented by being reduced. On the other hand, if the peak height h of the corrugated portion 21 is shorter than the above range, the stirring effect due to the turbulent motion of the fluid inside the corrugated tube 2 may not be sufficiently exhibited, and the heat exchange efficiency may be significantly reduced. If the peak height h of the corrugated portion 21 is longer than the above range, not only does the fluid stagnate and the heat exchange efficiency is reduced, but also the pressure loss of the fluid increases, It is known that may cause vibration or breakage due to the vibration. In this embodiment, the peak height h of the corrugated portion 21 is set within the above range by setting the inner diameter of the valley portion of the corrugated tube 2 having the inner diameter of 9.52φ to 8.85φ. It is particularly desirable to set the peak height h to 0.2 to 1.0 mm. If the peak height h exceeds this range, the vibration of the corrugated tube 2 becomes too severe and the baffle plate 5 suppresses the vibration. It becomes difficult.

  In this embodiment, although the corrugated tube 2 is provided with the smooth tube portion 22 supported by the baffle plate 5 at more than two places, the smooth tube portion 22 supported by the baffle plate 5 has at least What is necessary is just to form in two places of a pipe. The number of places where the smooth tube portion 22 is formed should be appropriately selected in consideration of the length and inner diameter of the corrugated tube 2.

FIG. 2 is a partially cutaway side view schematically illustrating the multitubular module heat exchanger according to the present invention. It is explanatory drawing which showed the insertion part of the corrugated tube to the hole part of a baffle plate. It is the partially broken side view which showed the principal part of the corrugated tube.

Explanation of reference numerals

Reference Signs List 1 shell 2 corrugated tube 5 baffle plate 21 corrugated portion 22 smooth tube portion 51 hole A multi-tube module heat exchanger D inner diameter of shell h crest height of corrugated portion H inner diameter of corrugated portion at top of crest L1 Shaft length dimension of corrugated part L2 Length of smooth tube part (shaft length)

Claims (4)

A second fluid passage formed by a group of a large number of corrugated tubes is provided inside a shell forming the first fluid passage, and the first fluid passage is provided at a plurality of axial locations inside the shell. A multi-tube module heat exchanger in which the corrugated tubes are individually inserted into a plurality of holes formed in a baffle plate that meanders,
The corrugated tube is made of titanium or stainless steel, and the insertion point of the corrugated tube with respect to the hole of the baffle plate is formed as a smooth tube portion having no irregularities on the outer peripheral surface, and the smooth tube portion is formed. A multitubular module heat exchanger, wherein the length is longer than the axial length of the hole of the baffle plate. The corrugated tube is provided with the smooth tube portion at at least two places in the axial direction, and the axial length dimension of the corrugated portion provided over the entire space between two smooth tube portions adjacent in the axial direction is cylindrical. The multi-tubular module heat exchanger according to claim 1, wherein the inner diameter of the shell is 0.5 to 3.5 times the inner diameter of the shell. The multitubular module heat exchanger according to claim 1 or 2, wherein the smooth tube has an axial length of 5 to 50 mm. The multi-tube module heat exchanger according to any one of claims 1 to 3, wherein the crest height of the corrugated portion of the corrugated tube is 1 to 20% of the inner diameter at the top of the corrugated portion. .

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