KR101789912B1 - Installation structure for tube ends of heat exchanger and heat exchanger having the same - Google Patents

Installation structure for tube ends of heat exchanger and heat exchanger having the same Download PDF

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Publication number
KR101789912B1
KR101789912B1 KR1020160010624A KR20160010624A KR101789912B1 KR 101789912 B1 KR101789912 B1 KR 101789912B1 KR 1020160010624 A KR1020160010624 A KR 1020160010624A KR 20160010624 A KR20160010624 A KR 20160010624A KR 101789912 B1 KR101789912 B1 KR 101789912B1
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South Korea
Prior art keywords
tube
diameter portion
diameter
fastening hole
bushing
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Application number
KR1020160010624A
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Korean (ko)
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KR20170090132A (en
Inventor
문진환
임종길
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문진환
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Priority to KR1020160010624A priority Critical patent/KR101789912B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
    • F28F9/262—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators
    • F28F9/266—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators by screw-type connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F11/00—Arrangements for sealing leaky tubes and conduits
    • F28F11/02—Arrangements for sealing leaky tubes and conduits using obturating elements, e.g. washers, inserted and operated independently of each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • F28F2009/222—Particular guide plates, baffles or deflectors, e.g. having particular orientation relative to an elongated casing or conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2220/00—Closure means, e.g. end caps on header boxes or plugs on conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2230/00—Sealing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/20—Fastening; Joining with threaded elements

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The fixing structure of the end portion of the heat exchanger tube is characterized by comprising a tube through which the heat exchange medium flows, a first diameter portion having an inner diameter corresponding to the outer diameter of the tube, and a second diameter portion formed continuously with the first diameter portion A tube sheet having a second diameter portion having a larger inner diameter and a fastening hole formed to be concentric with the second diameter portion and having a larger diameter than the inner diameter of the second diameter portion, And a bushing having an outer diameter portion and a male screw portion having a shape complementary to the second diameter portion and the female thread portion of the fastening hole so as to be concentric with each other and having a shaft diameter portion at the end of the insertion hole; And a sealing member disposed in a step portion formed between the first diameter portion and the second diameter portion of the fastening hole, wherein the tube inserted into the fastening hole of the tube sheet is screwed to the fastening hole And is fixed to the tube sheet.

Figure R1020160010624

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing structure of a tube end of a heat exchanger and a heat exchanger using the same,

The present invention relates to a fixing structure of a tube end of a heat exchanger, in which a tube sheet is screwed with no welded part, and a structure in which a tube is fixed through a bushing while a hermetic seal is maintained by a sealing member, To a fixing structure of a tube end of a heat exchanger which can be applied even when the tube and the tube sheet are made of different materials other than metal.

A heat exchaner is a device that exchanges heat between two fluids. That is, it refers to a device for causing heat transfer between two fluids, a high-temperature fluid and a low-temperature fluid, and refers to a pressure vessel widely used for heating and hot water supply in chemical industry and general buildings. Generally, the purpose of heat recovery is called a heat exchanger, but in a broad sense includes a heater, a cooler, and a condenser.

The heat exchanger can be classified as follows according to the heat transfer method, the purpose of use, and the structure.

Depending on the heat transfer method, a surface heat exchanger, a regenerator, a liquid-coupled indirect-type exchanger, a direct-contact heat exchanger exchanger.

Depending on the purpose of use, it can be classified into a heater, a preheater, a superheater, an evaporator, a reheater, a cooler, and a condenser.

Also, if classified according to the structure, a submerged pipe coil exchanger, an open type exchanger, a double pipe exchanger, a shell and tube exchanger, A spiral tube type exchanger, an air cooling type exchanger, a jacketed type exchanger, a plate type exchanger, a volute type exchanger, a block type heat exchange A block type exchanger, and a compact exchanger.

Here, the shell and tube exchanger is a heat exchanger in which a plurality of tubes are arranged in parallel in a cylindrical tube (shell tube), and almost all the heat exchangers in the chemical apparatus follow this method . The most widely used type of heat exchanger is the cylindrical tube heat exchanger because it has a wide range of heat transfer, wide application range, and high reliability and efficiency. As an example of a cylindrical pipe-tube heat exchanger, Korean Patent Laid-Open Publication No. 2015-0126677 of Patent Document 1 can be introduced.

However, in order for a plurality of tubes arranged in parallel to the inside of the outer tube to be held in place, a fixture for holding the tube is required. For this purpose, tubes are inserted into holes formed in the baffles which are spaced apart at regular intervals so as to increase the flow distance of the fluid inside the tube, and a tube sheet is provided on both ends of the tube to fix the tubes.

Conventionally, a method has been used in which a tube is inserted into a fastening hole formed in a tube sheet, and the tube is sealed and fixed by welding (see Patent Document 1). However, the welding method is quite good in maintaining the fixed state and airtightness, but has some problems.

That is, if the fluid flowing through the heat exchanger is a corrosive chemical or a part of the fluid is contained in the fluid, the tube is corroded over time. If this is the case, you will have to replace the failed tube, because all tubes are welded to the tube sheet, so you must replace the entire tube with a new one. This leads to an increase in the maintenance cost.

If a tube sheet which does not need to have high strength is made of a synthetic resin material resistant to corrosion such as Teflon (fluorine resin), it will be helpful to maintain and manage the heat exchanger. However, a tube of a metal material such as steel or stainless steel Can not be welded to a tube sheet made of a synthetic resin material.

Korean Laid-Open Patent No. 2015-0126677 (published Nov. 12, 2015)

The present invention makes it possible to select and replace only the tubes required for repairing by making the both ends of the tubes of the tube-type pipe heat exchanger not replaceable by welding, but by fixing them so that the tube and the tube sheet can be made of different materials And an object of the present invention is to provide a fixing structure of a heat exchanger tube end and a heat exchanger using the same.

The fixing structure of the end portion of the heat exchanger tube according to the present invention comprises a tube in which a heat exchange medium flows, a first diameter portion having an inner diameter corresponding to the outer diameter of the tube, a second diameter portion formed continuously with the first diameter portion, A tube sheet having a second diameter portion having a diameter larger than that of the first diameter portion and a fastening hole formed in a concentric shape with a female screw portion formed in succession to the second diameter portion and having a larger diameter than a diameter of the second diameter portion; A bushing having an inner diameter corresponding to an outer diameter of the insertion hole and an outer diameter portion and a male screw portion having a shape complementary to the second diameter portion and the female thread portion of the fastening hole so as to be concentric with each other and having a shaft- And a sealing member disposed in a step portion formed between the first diameter portion and the second diameter portion of the fastening hole, wherein the tube inserted into the fastening hole of the tube sheet is screwed to the fastening hole And fixed to the tube sheet.

A tool groove may be formed on the outer surface of the bushing.

The sealing member may be at least one O-ring, and at least two O-rings may be provided between the O-rings.

According to another aspect of the present invention, there is provided a heat exchanger including: an envelope tube through which a first heat exchange medium flows; a tube disposed in the envelope tube and through which the second heat exchange medium flows; A second diameter portion formed in the first diameter portion and having an inner diameter larger than that of the first diameter portion; and a second diameter portion formed in succession to the second diameter portion and having a larger diameter than the inner diameter of the second diameter portion A tube sheet having a plurality of fastening holes formed so as to form concentric annular portions, an insert hole having an inner diameter corresponding to the outer diameter of the tube, and an outer diameter portion and a male screw portion having a shape complementary to the second diameter portion and the female thread portion of the fastener, A bushing formed concentrically and having a diameter-reduced portion at an end of the insertion hole; And a sealing member disposed in a step portion formed between the first diameter portion and the second diameter portion of the fastening hole, wherein the tube inserted into the fastening hole of the tube sheet fixed to both ends of the sheath tube And the bushing is screwed to the fastening hole and fixed to the tube sheet.

A plurality of baffles for fixing the tubes and alternating the flow of the first heat exchange medium flowing in the shell tube are installed on the inner wall of the outer tube.

Here, the baffle is a plate body in which a part of the original plate is cut, and the cut portions are alternately arranged.

A plug corresponding to the outer shape of the bushing may be fastened to at least a part of the plurality of fastening holes provided in the tube sheet.

A header for wrapping the tube sheet is connected to both ends of the outer tube.

The fixing structure of the tube end of the heat exchanger of the present invention having the above-described structure is a structure that fixes the tube through the tube sheet and the bushing to be screwed together without any welding part, while maintaining the airtightness by the sealing member. It is possible to selectively replace it. Therefore, maintenance and repair of the heat exchanger is easy and the cost is also reduced.

Further, since the welding operation is not necessary, the present invention has an advantage that the tube and the tube sheet can be applied even when they are made of different materials other than metal.

In addition, if only some of the tubes are damaged enough to prevent the performance of the heat exchanger, or if the heat exchanger needs to be temporarily operated even while the tube is being prepared for replacement, the problematic tube can be plugged and used continuously Therefore, the heat exchanger can be operated flexibly according to the situation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing the entire outline of a heat exchanger according to the present invention. FIG.
2 is a cross-sectional view illustrating the interior of the heat exchanger along the "AA"
3 is an exploded perspective view showing a coupling structure of a portion "B"
4 is an enlarged cross-sectional view of a portion "B" in Fig.
5 is an enlarged perspective view of a portion "C" in Fig. 2; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the drawings, the same reference numerals are used to denote the same or similar components in different drawings, and are denoted by the same reference numerals whenever possible, and in some drawings, the structure of the heat exchanger is clearly defined It should be noted that some configurations may be omitted.

FIG. 1 is a perspective view showing the overall outline of a heat exchanger 10 according to the present invention. FIG. 1 is a sectional view of an envelope 100 in which a tube 200 and a first heat exchange medium M1 flow, And a header 700 connected to both ends of the outer tube 100 to enclose the tube sheet 300. [ The second heat exchange medium M2 flowing in the tube 200 is supplied to the tube 200 through a space (plenum chamber) inside the one header 700 and discharged through the opposite header 700. Flanges are provided at both ends of the outer tube 100 and the header 700, respectively, and the flanges are coupled by bolts (not shown).

2 is a cross-sectional view illustrating the inside of the heat exchanger 10 according to the improvement of the section AA of FIG. 1. As shown in FIG. 2, in the envelope tube 100, a plurality of tubes 200 are arranged in parallel Respectively. The first heat exchanging medium M1 flowing through the envelope tube 100 exchanges heat with the second heat exchanging medium M2 flowing in the tube 200 as a boundary and the flow of the first heat exchanging medium M1 A plurality of tubes 200 are arranged side by side so that heat exchange can be uniformly formed over the entire area.

The structure for arranging and arranging the tube 200 in the envelope tube 100 can be divided into a support in the envelope tube 100 and a fixation at both ends of the envelope tube 100. Each structure is shown in Figs. Will be described in detail.

Fig. 3 is an exploded perspective view showing the coupling structure of the portion "B" in Fig. 2, and Fig. 4 is an enlarged cross- Show fixed structure.

A tube sheet 300 having an outer shape (circular in the illustrated embodiment) corresponding to the sectional shape of the envelope tube 100 for fixing the tube 200 at both ends of the envelope tube 100 is provided. The tubesheet 300 is provided with a plurality of fastening holes 310 for inserting and fixing the tubes 200. The arrangement of the tubes 200 is designed in such a manner that the plurality of fastening holes 310 are aligned do. The plurality of fastening holes 310 are uniformly formed for uniform heat exchange as described above, and may be arranged to form a concentric circle structure or a lattice structure, for example. The illustrated embodiment shows an example in which a plurality of fastening holes 310 are arranged in a lattice form.

4 is a cross-sectional view for clearly showing the structure of the fastening hole 310, and all of the fastening holes 310 are the same.

The fastening hole 310 has a two-stepped stepped structure and has a first diameter portion 312 having an inner diameter corresponding to the outer diameter of the tube 200 and a second diameter portion 312 having a larger inner diameter than the first diameter portion 312 And a female threaded portion 318 having a larger diameter than the inner diameter of the second diameter portion 314 is formed concentrically with the second diameter portion 314.

A bushing 400 for fixing the tube 200 is coupled to the outer side of the coupling hole 310. The bushing 400 has an insertion hole 410 having an inner diameter corresponding to the outer diameter of the tube 200 The outer diameter of the outer diameter portion 416 and the diameter of the male threaded portion 418 are formed so as to be concentric with the second diameter portion 314 and the female threaded portion 318 of the fastening hole 310 have. That is, the outer diameter portion 416 and the male threaded portion 418 of the bushing 400 fit into the second diameter portion 314 and the female threaded portion 318 of the fastening hole 310, respectively.

The distal end of the insertion hole 410 is formed with a reduced diameter portion 412. It is preferable that the distal end of the insertion hole 410 is formed so as to be in close contact with the end of the tube 200 with a stepped portion bent at 90 degrees as shown in the illustrated embodiment.

When the fixing hole 310 and the bushing 400 of the tube sheet 300 are formed with the above structure and the total length of the tube 200 is set to the sum of the length of the outer tube 100 and the thickness of the tube sheet 300 The tubes 200 inserted into the fastening holes 310 of the tube sheet 300 coupled to both ends of the outer tube 100 are pressed and fixed in place by the reduced diameter portions 412 of the two side bushings 400. Since the first diameter portion 312 of the fastening hole 310 and the inner diameter of the insertion hole 410 of the bushing 400 correspond to the outer diameter of the tube 200, It does not shake without it.

Here, it is necessary to ensure airtightness so that the first heat exchanging medium M1 and the second heat exchanging medium M2 do not mix or leak with the fastening holes 310 of the tube sheet 300 as a boundary. And the bushing 400 may not be sufficient. Therefore, it is preferable to arrange the sealing member 500 in the step portion 316 formed between the first diameter portion 312 and the second diameter portion 314 of the fastening hole 310 to secure airtightness . In the illustrated embodiment of the present invention, a known O-ring is applied as the sealing member 500. Here, at least one or more O-rings may be provided. If two or more O-rings are provided, a guide ring 510 may be interposed between the O-rings. This is because it is disadvantageous to directly contact the elastic O-rings with each other. Therefore, it is preferable to increase the area or the number of the contact portions where the O-rings can hermetically function by inserting the guide ring 510 having a low elasticity therebetween It is effective.

In the structure not illustrated in the figures, a tool groove 414 such as a driver groove is formed on the outer surface of the reduced diameter portion 412 of the bushing 400. The tool groove 414 is intended to securely fasten the bushing 400 to the fastening hole 310 while applying a proper pressure to the tube 200 by tightening the bushing 400 with a sufficient force.

The configuration of the plug 450 shown in the fastening hole 310 at the lowermost position in FIG. 4 may also be included. The plug 450 has a shape corresponding to the contour of the bushing 400, but is a plug that is completely clogged without the insertion hole 410 in the bushing 400. If the heat exchanger 10 is to be temporarily operated even while some of the tubes 200 are damaged to such an extent as not to adversely affect the performance of the heat exchanger 10 or during preparation for replacing the tubes 200 So that the tube 200 which is a problem can be plugged with the plug 450 and used continuously. Of course, it is preferable that the plug 450 has a tool groove 414 formed therein. In order to remove the tube 200, the plug 450 may be protruded to at least a portion of the first diameter 312 of the fastening hole 310 May be further provided.

5 is an enlarged perspective view of the portion "C" in Fig. 2, showing a structure for supporting the tube 200 in the envelope tube 100. Fig.

A plurality of baffles 600 spaced apart at regular intervals are provided in the outer tube 100 to alternate the flow of the first heat exchange medium M1. In the baffle 600, So that the elongated tubes 200 are arranged side by side without deflection. Of course, the arrangement of the holes formed in the baffle 600 corresponds to the arrangement of the fastening holes 310 formed in the tube sheet 300.

Here, the baffle 600 not only functions to support the tube 200, but also alternately switches the flow of the first heat exchange medium M1 flowing through the outer tube 100 so that the first heat exchange medium M1 flows into the tube 200) to increase the amount of time it takes to contact the heat exchanger.

Accordingly, a part of the baffle 600 may be cut or penetrated to provide a space through which the first heat exchange medium M1 can flow. According to an embodiment of the present invention shown in FIG. 5, Is formed as a cut sheet. At this time, the flow of the first heat exchange medium M1 is alternately switched by disposing the cut portions of the baffle 600 alternately (upward and downward in the drawing).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

10: Heat exchanger 100: Shell tube
200: tube 300: tube sheet
310: fastening hole 312: first diameter portion
314: second diameter section 316:
318: Female thread part 400: Bushing
410: insertion hole 412:
414: Tool groove 416:
418: Male threads 450: Plug
500: sealing member 510: guide ring
600: Baffle 700: Header
M1: first heat exchange medium M2: second heat exchange medium

Claims (9)

A tube through which the heat exchange medium flows;
A first diameter portion having an inner diameter corresponding to the outer diameter of the tube, a second diameter portion formed in succession to the first diameter portion and having an inner diameter larger than that of the first diameter portion, A tube sheet having a fastening hole formed to have a female screw portion having a larger diameter than the inner diameter of the second diameter portion so as to form a concentric shape;
A bushing having an inner diameter corresponding to an outer diameter of the tube and an outer diameter portion and a male screw portion having a shape complementary to the second diameter portion and the female thread portion of the fastening hole so as to be concentric with each other and having a shaft- And
A sealing member disposed at a step portion formed between the first diameter portion and the second diameter portion of the fastening hole;
Wherein the tube inserted into the fastening hole of the tube sheet is fixed to the tube sheet by screwing the bushing into the fastening hole. The method according to claim 1,
Wherein a tool groove is formed on an outer surface of the bore diameter portion of the bushing. The method according to claim 1,
Wherein the sealing member is at least one O-ring. The method of claim 3,
Wherein at least two O-rings are provided, and a guide ring is interposed between the O-rings. An envelope tube through which the first heat exchange medium flows;
A tube disposed in the sheath tube and through which the second heat exchange medium flows;
A first diameter portion having an inner diameter corresponding to the outer diameter of the tube, a second diameter portion formed in succession to the first diameter portion and having an inner diameter larger than that of the first diameter portion, A tube sheet having a plurality of fastening holes formed in such a manner that a female screw portion having a diameter larger than the inner diameter of the second diameter portion is formed in a concentric manner;
A bushing having an inner diameter corresponding to an outer diameter of the tube and an outer diameter portion and a male screw portion having a shape complementary to the second diameter portion and the female thread portion of the fastening hole so as to be concentric with each other and having a shaft- And
A sealing member disposed at a step portion formed between the first diameter portion and the second diameter portion of the fastening hole;
Wherein the bushing is fixed to the tube sheet by screwing the tube inserted into the fastening holes of the tube sheet fixed to both ends of the sheath tube to the fastening hole. 6. The method of claim 5,
Wherein a plurality of baffles for fixing the tube and alternating the flow of the first heat exchange medium flowing in the shell tube are installed on the inner wall of the outer tube. The method according to claim 6,
Wherein the baffle is a plate body from which a part of the original plate is cut, and the cut portions are alternately arranged. 6. The method of claim 5,
Wherein a plug corresponding to an outer shape of the bushing is fastened to at least a part of the plurality of fastening holes provided in the tube sheet. 6. The method of claim 5,
And a header for surrounding the tube sheet is connected to both ends of the outer tube.
KR1020160010624A 2016-01-28 2016-01-28 Installation structure for tube ends of heat exchanger and heat exchanger having the same KR101789912B1 (en)

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CN109631622B (en) * 2018-12-17 2020-03-10 重庆华森制药股份有限公司 Water cooling circulation structure for double-effect concentration recovery unit cooler
CN111678363A (en) * 2020-07-10 2020-09-18 贵州兰鑫石墨机电设备制造有限公司 Double-tube-plate silicon carbide heat exchanger with single-plate double-seal structure
KR102317617B1 (en) * 2021-04-12 2021-10-26 주식회사 태진중공업 Compressed hydrogen geat exchanger

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101550176B1 (en) 2015-04-03 2015-09-03 세원셀론텍(주) Shell and tube heat exchanger
JP2015190537A (en) 2014-03-28 2015-11-02 株式会社ジェイ・エム・エス Coupling device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015190537A (en) 2014-03-28 2015-11-02 株式会社ジェイ・エム・エス Coupling device
KR101550176B1 (en) 2015-04-03 2015-09-03 세원셀론텍(주) Shell and tube heat exchanger

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