JP6568464B2 - Triple tube heat exchanger - Google Patents

Description

  The present invention relates to a triple tube heat exchanger.

Conventionally, there are various heat exchangers such as a plate heat exchanger, a coil heat exchanger, and a multi-tubular heat exchanger.
The plate heat exchanger superimposes a plurality of plates, and cools the target fluid by flowing a heat medium such as water and the target fluid alternately in a gap between the plates.
Coiled heat exchangers are manufactured by immersing a coiled tube that has been processed by bending the tube into a coil shape in a heat medium such as water, or by flowing the heat medium through an outer tube as a double tube. The target fluid is cooled to cool the target fluid.
A multi-tube cylindrical heat exchanger cools a target fluid by arranging a large number of heat transfer tubes in a cylinder, flowing a heat medium in a cylinder outside the heat transfer tube, and flowing the target fluid in the heat transfer tube Is.

  A triple-pipe heat exchanger is known that includes an inner tube, an intermediate tube that covers the radially outer side of the inner tube, and an outer tube that covers the radially outer side of the intermediate tube (see Patent Documents 1 and 2). . This triple tube heat exchanger cools the target fluid by flowing a heat medium in the inner tube and between the intermediate tube and the outer tube, and flowing the target fluid between the inner tube and the intermediate tube. .

In Patent Document 1, the inlet and outlet portions of the aqueous medium are arranged on one end side of the heat exchanger, and the position of the joint is fixed even if the pipe length of the heat exchanger is changed, and is stored in a piping route or the like in the unit. A triple-tube heat exchanger that can improve performance is disclosed.
In Patent Document 2, the intermediate pipe is formed into a waveform in which crests and troughs are alternately arranged in the circumferential direction, and the area in which the intermediate pipe contacts the heat medium in the inner pipe and the outer pipe is widened. A triple-tube heat exchanger capable of improving the size and reducing the size is disclosed.

JP 2002-340486 A JP 2013-53804 A

However, since the plate type heat exchanger has a large area of the pressure receiving portion of the target fluid, there is a risk that when the heat exchange with the high pressure target fluid is performed, the sealing performance becomes insufficient and the target fluid leaks. There was a problem that there was.
Moreover, the coil-type heat exchanger and the multi-tubular cylindrical heat exchanger have a problem that it is difficult to disassemble the heat exchanger and clean the inside of the pipe.
Furthermore, the triple-pipe heat exchanger disclosed in Patent Documents 1 and 2 is assumed to deteriorate over time due to processing in a high-pressure environment, to disassemble the elements of the heat exchanger as appropriate, and to clean the pipe. There wasn't.

  The present invention has been made in view of the circumstances described above, and an object of the present invention is to provide a triple-tube heat exchanger that can ensure hermeticity even when the target fluid is at a high pressure and is easy to disassemble and clean.

To achieve the above object, a triple-pipe heat exchanger according to the present invention includes a first tube and a second tube having a bottomed cylindrical shape that covers a radially outer side of the first tube, A third pipe covering a radially outer side of the second pipe, and a first heat medium flow path through which the heat medium passes is formed on a radially inner side of the first pipe, A second heat medium flow path through which the heat medium passes is formed between the second pipe and the third pipe, and cooling is performed between the first pipe and the second pipe. Alternatively, a target fluid flow path through which a target fluid to be heated passes is formed, and the first tube has a cylindrical main body portion and a side of the main body portion on which the second tube is open. A cylindrical large-diameter portion having an outer diameter larger than that of the main body portion, and an annular groove is formed on the outer peripheral surface of the large-diameter portion. The seal member for sealing is mounted between the first tube and the second tube, wherein the first tube and the second tube, the in the axial direction the second tube is open It is characterized in that it is detachably fixed at the end portion on the side where it is present.

In this configuration, the first tube and the second tube are detachably fixed at the end in the axial direction. For this reason, it can remove | separate from a state which fixed the 1st pipe | tube and the 2nd pipe | tube, and can decompose | disassemble easily. Therefore, the outer peripheral surface of the first tube and the inner peripheral surface of the second tube constituting the target fluid flow path through which the target fluid passes can be exposed to the outside and easily cleaned. Further, in the state where the first pipe and the second pipe are fixed, the area of the pressure receiving portion of the target fluid is smaller than that of, for example, a plate heat exchanger, so even when heat is exchanged with the high-pressure target fluid. The target fluid can be well sealed to prevent leakage.
That is, even when the target fluid is at a high pressure, it is possible to provide a triple tube heat exchanger that can ensure hermeticity and can be easily disassembled and cleaned.
In addition, since the first tube and the second tube are detachably fixed at one end in the axial direction, the fixing structure between the first tube and the second tube is simplified, and the first tube Disassembly and assembly of the first tube and the second tube is easier.

  In the triple pipe heat exchanger, preferably, the first heat medium flow path extends in the axial direction in the first pipe, and one end of the first heat medium flow path. A heat medium inlet through which the heat medium is introduced is provided in the section, and a heat medium outlet through which the heat medium is discharged is provided at the other end of the first heat medium flow path.

  In this configuration, the diameter of the target fluid channel among the first heat medium channel and the second heat medium channel arranged so as to sandwich the target fluid channel in order to increase the heat transfer area. The first heat medium flow channel located on the inner side in the direction can have a simple configuration.

  In the triple pipe heat exchanger, preferably, at least one of the flow direction of the heat medium passing through the first heat medium flow path and the flow direction of the heat medium passing through the second heat medium flow path, The flow direction of the target fluid passing through the target fluid flow path is set in the opposite direction.

  In this configuration, the temperature difference between the heat medium and the target fluid in the portion where heat exchange is performed becomes large, so that the heat exchange amount can be increased.

  In the triple pipe heat exchanger, a plurality of fins are preferably disposed on the inner surface of the first pipe.

  In this configuration, in heat exchange between the heat medium flowing through the first heat medium flow path and the target fluid flowing through the target fluid flow path, the heat transfer (heat dissipation or heat absorption) area through the wall portion of the first tube Therefore, the heat exchange performance is improved.

  In the triple pipe heat exchanger, a plurality of fins are preferably disposed on the outer surface of the second pipe.

  In this configuration, in heat exchange between the heat medium flowing through the second heat medium flow path and the target fluid flowing through the target fluid flow path, the heat transfer (heat dissipation or heat absorption) area through the wall portion of the second pipe Therefore, the heat exchange performance is improved.

  According to the present invention, it is possible to provide a triple-pipe heat exchanger that can ensure hermeticity even when the target fluid is at a high pressure and can be easily disassembled and cleaned.

It is a schematic longitudinal cross-sectional view which shows the structure of the triple pipe type heat exchanger which concerns on 1st Embodiment of this invention. FIG. 2 is a right side view of the triple tube heat exchanger shown in FIG. 1. It is sectional drawing which follows the III-III line of FIG. It is a schematic longitudinal cross-sectional view which shows the structure of the triple-pipe heat exchanger which concerns on 2nd Embodiment of this invention. It is a right view of the triple-pipe heat exchanger shown by FIG. It is sectional drawing which follows the VI-VI line of FIG.

(First embodiment)
First, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic longitudinal sectional view showing the configuration of a triple-pipe heat exchanger 100 according to the first embodiment of the present invention, and is a sectional view taken along the line I-I in FIG. FIG. 2 is a right side view of the triple tube heat exchanger 100 shown in FIG. 3 is a cross-sectional view taken along line III-III in FIG.
For convenience of explanation, the left side in FIG. 1 is referred to as “front” and the right side is referred to as “rear”.

  As shown in FIG. 1, a triple-pipe heat exchanger 100 according to this embodiment includes an inner tube (first tube) 1 and an intermediate tube (second tube) 2 that covers the radially outer side of the inner tube 1. And an outer tube (third tube) 3 that covers the radially outer side of the intermediate tube 2.

  A first heat medium flow path 51 through which the heat medium passes is formed on the inner side in the radial direction of the inner tube 1. A second heat medium flow path 52 through which the heat medium passes is formed between the intermediate tube 2 and the outer tube 3. A target fluid flow path 53 through which the target fluid to be cooled or heated passes is formed between the inner tube 1 and the intermediate tube 2. Here, for example, a heat medium such as water is used, and for example, a high-viscosity target fluid is used.

  The inner tube 1 includes a cylindrical main body part 11, a cylindrical large diameter part 12 provided on the front side of the main body part 11, and a disc-shaped rear end part 13 provided on the rear side of the main body part 11. Which are formed in one piece here. That is, the inner tube 1 as a whole has a bottomed cylindrical shape with an open front side.

  The inner diameter of the large diameter portion 12 is the same as the inner diameter of the main body portion 11, and the outer diameter of the large diameter portion 12 is larger than the outer diameter of the main body portion 11. An annular groove 15 is formed on the outer peripheral surface of the large diameter portion 12, and a seal member 54 such as an O-ring is attached to the groove 15.

  The rear end portion 13 of the inner tube 1 has an outer peripheral portion 14 that extends radially outward from the outer diameter of the main body portion 11. An annular groove 16 is formed on the front surface (the surface on the intermediate tube 2 side) of the outer peripheral portion 14, and a sealing member 55 such as an O-ring is attached to the groove 16. A heat medium outlet T2 through which the heat medium is discharged is formed at the center of the rear end portion 13. The heat medium outlet T2 communicates with the first heat medium flow path 51.

  The intermediate tube 2 includes a cylindrical main body portion 21, a cylindrical front large diameter portion 22 provided on the front side of the main body portion 21, and a shallow bottomed cylindrical shape provided on the front side of the front large diameter portion 22. The front end portion 23 and a cylindrical rear large-diameter portion 24 provided on the rear side of the main body portion 21 are integrally formed here. That is, the intermediate tube 2 has a bottomed cylindrical shape with an open rear side. In the center of the front end portion 23, a heat medium inlet T1 into which the heat medium is introduced is formed. The heat medium inlet T1 communicates with the first heat medium flow path 51.

  The inner diameters of the front large diameter portion 22 and the rear large diameter portion 24 are the same as the inner diameter of the main body portion 21, and the outer diameters of the front large diameter portion 22 and the rear large diameter portion 24 are larger than the outer diameter of the main body portion 21. A target fluid inlet S1 into which a target fluid is introduced is formed on the outer peripheral surface of the front large diameter portion 22. Further, a target fluid outlet S <b> 2 from which the target fluid is discharged is formed on the outer peripheral surface of the rear large diameter portion 24. The target fluid inlet S1 and the target fluid outlet S2 communicate with the target fluid channel 53, respectively. The circumferential positions of the target fluid inlet S1 and the target fluid outlet S2 are set to be 180 degrees opposite to each other here.

The outer peripheral surface of the large diameter portion 12 of the inner tube 1 is fitted to the inner peripheral surface of the front end portion 23 of the intermediate tube 2, and a seal member 54 is sealed between the two. On the other hand, the front surface of the outer peripheral portion 14 of the inner tube 1 is in contact with the rear end surface of the rear large-diameter portion 24 of the intermediate tube 2.
As shown in FIG. 2, the outer peripheral portion 14 of the inner tube 1 and the rear large-diameter portion 24 (see FIG. 1) of the intermediate tube 2 are fixed by bolts 56 (for example, six M8 bolts) as a plurality of fixing means. The two are sealed by a seal member 55 (see FIG. 1).

  As shown in FIG. 1, the outer tube 3 includes a cylindrical main body portion 31, a cylindrical front large-diameter portion 32 provided on the front side of the main body portion 31, and a cylinder provided on the rear side of the main body portion 31. A rear large-diameter portion 33 having a shape is provided, which are integrally formed here. That is, the outer tube 3 has a cylindrical shape that is open on both sides in the axial direction as a whole.

  The inner diameters of the front large diameter portion 32 and the rear large diameter portion 33 are the same as the inner diameter of the main body portion 31, and the outer diameters of the front large diameter portion 32 and the rear large diameter portion 33 are larger than the outer diameter of the main body portion 31. A boss portion 57 is fixed to the installation surface 34 formed by cutting a part of the outer peripheral surface of the front large-diameter portion 32 flatly by welding all around. The boss portion 57 is formed with a heat medium outlet T4 through which the heat medium is discharged. The heat medium outlet T4 communicates with the second heat medium flow path 52 through a hole 35 formed in the front large diameter portion 32. Further, a boss portion 58 is fixed to the installation surface 36 formed by cutting a part of the outer peripheral surface of the rear large-diameter portion 33 flatly by welding all around. The boss portion 58 is formed with a heat medium inlet T3 into which the heat medium is introduced. The heat medium inlet T <b> 3 communicates with the second heat medium flow path 52 through a hole 37 formed in the rear large diameter portion 33. Here, the circumferential positions of the heat medium inlet T3 and the heat medium outlet T4 are set to be 180 degrees opposite to each other. Further, the circumferential positions of the target fluid inlet S1 and the heat medium outlet T4 and the circumferential positions of the target fluid outlet S2 and the heat medium inlet T3 are set to be shifted from each other by 45 degrees.

  The heat medium inlet T1, the heat medium outlet T2, the heat medium inlet T3, the heat medium outlet T4, the target fluid inlet S1, and the target fluid outlet S2 are respectively formed with pipe screws for connecting to a pipe (not shown). Here, the heat medium outlet T2 and the heat medium inlet T3 are connected via a pipe (not shown).

  The outer tube 3 and the intermediate tube 2 are joined in close contact with each other at both ends in the axial direction. Specifically, the outer peripheral surface of the front large-diameter portion 22 of the intermediate tube 2 is fitted to the inner peripheral surface of the front large-diameter portion 32 of the outer tube 3, and the two are sealed and fixed by welding or the like. ing. Further, the outer peripheral surface of the rear large-diameter portion 24 of the intermediate tube 2 is fitted to the inner peripheral surface of the rear large-diameter portion 33 of the outer tube 3, and the two are sealed and fixed by welding or the like.

  As shown in FIG. 3, a plurality of (for example, eight) fins F <b> 1 are provided on the inner peripheral surface (inner surface) of the main body 11 of the inner tube 1. A plurality of (for example, 24) fins F2 are provided on the outer peripheral surface (outer surface) of the main body 21 of the intermediate tube 2. The fins F1 and F2 have a rectangular plate shape. The plurality of fins F <b> 1 are installed at equal intervals along the circumferential direction of the inner peripheral surface of the main body 11 of the inner tube 1. Further, the plurality of fins F <b> 2 are installed side by side at equal intervals along the circumferential direction of the outer peripheral surface of the main body portion 21 of the intermediate tube 2.

  By installing the fins F1 and F2, the heat transfer (heat dissipation or heat absorption) area can be increased and the heat exchange performance can be improved. For good heat conduction, the fin F1 needs to be installed in close contact with the inner tube 1 and the fin F2 must be installed in close contact with the intermediate tube 2. As for the installation method of the fins F1 and F2, a rectangular plate-like fins F1 and F2 may be welded to the inner tube 1 and the intermediate tube 2 later, respectively, or a part of the inner tube 1 and the intermediate tube 2 may be used. May be processed into a fin shape.

  The radial gap between the inner pipe 1 and the intermediate pipe 2 through which the target fluid flows is the heat exchange performance, the volume of the target fluid that stays in the gap, the working efficiency of pulling out the inner pipe 1 from the intermediate pipe 2, and the like. From the viewpoint, 1 mm to 15 mm is desirable, preferably 2 mm to 12 mm, more preferably 3 mm to 6 mm, and still more preferably 4 mm to 5 mm. In addition, the radial thicknesses of the main body part 11 of the inner pipe 1, the main body part 21 of the intermediate pipe 2, and the main body part 31 of the outer pipe 3 are 0.5 mm to 0.5 mm from the viewpoint of heat exchange performance, pressure resistance, durability, and the like. 5 mm is desirable, preferably 1 mm to 3 mm, more preferably 1 mm to 2 mm.

  The inner surface of the intermediate tube 2 and the outer surface of the inner tube 1 have sanitary specifications because the target fluid to be cooled or heated flows. As the inner surface of the intermediate tube 2 and the outer surface of the inner tube 1, a commercially available sanitary tube may be used, or a sanitary specification is made by performing surface treatment such as buffing in the final process of manufacturing the tube. May be. As the material of the inner tube 1, the intermediate tube 2, and the outer tube 3, stainless steel having high corrosion resistance is desirable.

Next, the operation of the triple tube heat exchanger 100 configured as described above will be described.
In FIG. 1, the flow of the heat medium is indicated by thick solid arrows, and the flow of the target fluid is indicated by white arrows (the same applies to FIG. 4).
As shown in FIG. 1, for example, a heat medium such as water is introduced into the heat medium inlet T <b> 1 via a pipe (not shown), and is formed on the inner side in the radial direction of the inner pipe 1. And is discharged from the heat medium outlet T2. The heat medium discharged from the heat medium outlet T2 is introduced into the heat medium inlet T3 via a pipe (not shown), and is formed between the intermediate pipe 2 and the outer pipe 3 as a second heat medium flow path 52. And is discharged from the heat medium outlet T4. On the other hand, for example, a high-viscosity target fluid is introduced into the target fluid inlet S1 via a pipe (not shown), and passes through the target fluid flow path 53 formed between the inner pipe 1 and the intermediate pipe 2, The fluid is discharged from the fluid outlet S2 to a pipe (not shown).

  At this time, the target fluid exchanges heat with the heat medium from the radially inner side through the wall portion of the inner tube 1 and also exchanges heat with the heat medium from the radially outer side through the wall portion of the intermediate tube 2. Since the heat transfer area between the target fluid and the heat medium can be increased by flowing the heat medium on both the radially inner side and the radially outer side of the target fluid in this way, the target fluid efficiently exchanges heat with the heat medium. And cooled or heated.

  As described above, in the triple-pipe heat exchanger 100 according to the present embodiment, the inner tube 1 and the intermediate tube 2 are detachably fixed at the rear end in the axial direction. Specifically, the inner tube 1 and the intermediate tube 2 are sealed by seal members 54 and 55 at both ends in the axial direction, and the inner tube 1 and the intermediate tube 2 are rearward in the axial direction. It is fastened and fixed using bolts 56 at the ends. However, it is only necessary that the inner tube 1 and the intermediate tube 2 are detachably fixed at at least one end in the axial direction. For example, the inner tube 1 and the intermediate tube 2 are axially forward ends, or It may be detachably fixed at both front and rear ends.

For this reason, it can remove from each other and can be easily disassembled from the state in which the inner tube 1 and the intermediate tube 2 are fixed. Therefore, the outer peripheral surface of the inner tube 1 and the inner peripheral surface of the intermediate tube 2 constituting the target fluid flow path 53 through which the target fluid passes can be exposed to the outside and easily cleaned. Further, in the state where the inner pipe 1 and the intermediate pipe 2 are fixed, the area of the pressure receiving portion of the target fluid is small compared to, for example, a plate heat exchanger, so that even when heat is exchanged with a high-pressure target fluid The fluid can be well sealed to prevent leakage.
That is, according to the present embodiment, it is possible to provide the triple-pipe heat exchanger 100 that can ensure hermeticity even when the target fluid is at a high pressure and can be easily disassembled and cleaned.

  Further, in the present embodiment, the intermediate tube 2 has a bottomed cylindrical shape, and the inner tube 1 and the intermediate tube 2 are detachably fixed at the end on the side where the intermediate tube 2 is open. Yes. In this configuration, since the inner tube 1 and the intermediate tube 2 are detachably fixed at one end in the axial direction, the fixing structure of the inner tube 1 and the intermediate tube 2 is simplified, and the inner tube 1 And the intermediate tube 2 can be easily disassembled and assembled.

  In the present embodiment, the first heat medium flow path 51 extends in the axial direction in the inner tube 1. A heat medium inlet T1 through which the heat medium is introduced is provided at the front end of the first heat medium flow path 51, and the heat medium is disposed at the rear end of the first heat medium flow path 51. Is provided with a heat medium outlet T2. In this configuration, the target fluid flow among the first heat medium flow channel 51 and the second heat medium flow channel 52 arranged so as to sandwich the target fluid flow channel 53 in order to increase the heat transfer area. The first heat medium flow channel 51 positioned on the radially inner side of the channel 53 can be configured simply.

In the present embodiment, the flow direction of the heat medium passing through the second heat medium flow path 52 and the flow direction of the target fluid passing through the target fluid flow path 53 are set in opposite directions. In this configuration, the temperature difference between the heat medium and the target fluid in the portion where heat exchange is performed becomes large, so that the heat exchange amount can be increased.
The configuration is not limited to the above-described configuration. For example, the flow direction of the heat medium passing through the first heat medium flow path 51 or the flow direction of the heat medium passing through the first heat medium flow path 51 and Both the flow direction of the heat medium passing through the second heat medium flow path 52 and the flow direction of the target fluid passing through the target fluid flow path 53 may be set in opposite directions.

  In the present embodiment, a plurality of fins F <b> 1 are arranged on the inner peripheral surface of the inner tube 1. In this configuration, in the heat exchange between the heat medium flowing through the first heat medium flow channel 51 and the target fluid flowing through the target fluid flow channel 53, the heat transfer area through the wall portion of the inner tube 1 increases. Heat exchange performance is improved.

  In the present embodiment, a plurality of fins F2 are arranged on the outer peripheral surface of the intermediate tube 2. In this configuration, in the heat exchange between the heat medium flowing through the second heat medium flow channel 52 and the target fluid flowing through the target fluid flow channel 53, the heat transfer area through the wall portion of the intermediate pipe 2 increases. Heat exchange performance is improved.

(Second Embodiment)
Next, with reference to FIGS. 4 to 6, the second embodiment of the present invention will be described with a focus on differences from the first embodiment described above, and descriptions of common points will be omitted as appropriate.

  FIG. 4 is a schematic longitudinal sectional view showing the configuration of the triple-pipe heat exchanger 100a according to the second embodiment of the present invention, and is a sectional view taken along line IV-IV in FIG. FIG. 5 is a right side view of the triple-pipe heat exchanger 100a shown in FIG. 6 is a cross-sectional view taken along line VI-VI in FIG.

  As shown in FIG. 4, the inner tube 1a is provided on the rear side of the main body 11a, a cylindrical main body 11a, a lid 12a provided to seal the front end opening of the main body 11a. And a disc-shaped rear end portion 13a.

  An introduction pipe 17 is installed on the front surface (axially inner surface) of the rear end portion 13a so as to communicate with a heat medium inlet T1 described later. The rear end of the introduction pipe 17 is fixed to the front surface of the rear end portion 13a by, for example, welding all around. The introduction pipe 17 is set to a length that forms a predetermined interval between the front end of the introduction pipe 17 and the lid portion 12a. The lid portion 12a is fixed to the main body portion 11a by, for example, full circumference welding. The main body 11a and the rear end 13a are integrally formed here.

  The rear end portion 13a of the inner tube 1 has an outer peripheral portion 14a that extends outward in the radial direction from the outer diameter of the main body portion 11a. An annular groove 16 is formed on the front surface (the surface on the side of the intermediate tube 2a) of the outer peripheral portion 14a, and a sealing member 55 such as an O-ring is attached to the groove 16.

  A target fluid outlet S2 through which the target fluid is discharged is formed at the center of the rear end portion 13a. The target fluid outlet S2 communicates with the target fluid flow path 53 via a plurality of (for example, four) passages 18 (see also FIG. 5). Further, a heat medium inlet T1 into which a heat medium is introduced is formed above the target fluid outlet S2 at the rear end portion 13a, and a heat medium is formed below the target fluid outlet S2 at the rear end portion 13a. A discharged heat medium outlet T2 is formed. The heat medium inlet T1 and the heat medium outlet T2 communicate with the first heat medium flow channel 51, respectively.

  The intermediate pipe 2a includes a cylindrical main body portion 21a, a cylindrical front large diameter portion 22a provided on the front side of the main body portion 21a, and a shallow bottomed cylindrical shape provided on the front side of the front large diameter portion 22a. Front end portion 23a and a cylindrical rear large-diameter portion 24a provided on the rear side of the main body portion 21a, which are integrally formed here. That is, the intermediate tube 2a as a whole has a bottomed cylindrical shape with an open rear side. A target fluid inlet S1 into which a target fluid is introduced is formed at the center of the front end portion 23a. The target fluid inlet S1 communicates with the target fluid flow path 53 via a space formed between the front end portion 23a and the lid portion 12a.

  As shown in FIG. 5, the outer peripheral portion 14a of the inner tube 1a and the rear large diameter portion 24a (see FIG. 1) of the intermediate tube 2a are fixed by a plurality of bolts 56 (for example, six M8 bolts), The gap between the two is sealed by a seal member 55 (see FIG. 1). On the other hand, as shown in FIG. 4, the front side of the inner tube 1 extends into the intermediate tube 2a and is not in contact with the intermediate tube 2a.

  In addition, as shown in FIG. 4, the outer tube | pipe 3 is the structure similar to 1st Embodiment (refer FIG. 1).

  As shown in FIG. 6, in this embodiment, a plurality of (for example, 20) fins F1a formed on the inner peripheral surface (inner surface) of the main body portion 11a of the inner tube 1a are radially inward of the inner tube 1a. It is installed not only in the radial direction outside. Further, a plurality of (for example, 24) fins F2a formed on the outer peripheral surface (outer surface) of the main body portion 21a of the intermediate tube 2a penetrate not only to the radially outer side of the intermediate tube 2a but also to the radially inner side. is set up. In this way, since the holes can be formed in the wall portions of the inner tube 1a and the intermediate tube 2a and the fins F1a and F2a can be fitted, the welding operation can be performed, so that the manufacturing is surely and easily performed.

  As described above, in the present embodiment, the inner tube 1a is closed at the front end in the axial direction. The first heat medium flow path 51 is folded back into a U shape using the introduction pipe 17 in the inner pipe 1a. In addition, a heat medium inlet T1 through which the heat medium is introduced and a heat medium outlet T2 through which the heat medium is discharged are respectively provided at both ends of the U-shaped flow path at the rear end of the inner tube 1a. Yes.

  In this configuration, the target fluid flow among the first heat medium flow channel 51 and the second heat medium flow channel 52 arranged so as to sandwich the target fluid flow channel 53 in order to increase the heat transfer area. The heat medium inlet T1 and the heat medium outlet T2 of the first heat medium flow path 51 located on the radially inner side of the path 53 are brought close to the rear end portion 13a as the end portion on the same side of the inner pipe 1a. Can be installed.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to the structure described in the said embodiment, The combination thru | or selecting suitably the structure described in the said embodiment is included. The configuration can be changed as appropriate without departing from the spirit of the invention. In addition, a part of the configuration of the embodiment can be added, deleted, and replaced.

  The method for tightly joining the outer tube 3 and the intermediate tube 2 and the method for connecting the intermediate tube 2 and the inner tube 1 are not particularly limited to the above-described embodiment, and further, the heat medium and the flow path port of the target fluid The position of (inlet and outlet) is not particularly limited to the above-described embodiment. That is, the heat medium flows through the gap between the intermediate tube 2 and the outer tube 3 and the inside of the inner tube 1, and the target fluid flows through the gap between the inner tube 1 and the intermediate tube 2. Various structures can be used as long as they are sandwiched from the inside and outside in the radial direction by the heat medium via the inner pipe 1 and the intermediate pipe 2 (sandwich structure) and do not cause mixing of the heat medium and the target fluid or leakage to the outside. Various structures and methods can be employed. Further, the order and direction in which the target fluid and the heat medium flow through the respective parts are not particularly limited to the above-described embodiment, and can be arbitrarily set.

  For example, in the second embodiment described above, the first heat medium flow path 51 is folded back into a U shape using the introduction pipe 17 in the inner pipe 1a. It may be folded back into a U shape using a partition plate that divides into two regions.

  In the above-described embodiment, the fins are installed only on the radially inner side of the inner tube 1 and on the radially outer side of the intermediate tube 2, but the installation position, the number, dimensions, and the like of the fins are particularly limited. is not.

Next, examples of the present invention will be described. However, the technical scope of the present invention is not limited by the following examples.
A test was performed using the triple-pipe heat exchanger 100 having the structure shown in FIGS. 1 to 3 (first embodiment). As for the dimensions of the outer tube 3, the outer diameter of the main body 31 is 146 mm, and the inner diameter of the main body 31 is 140 mm (thickness 3 mm). The dimensions of the intermediate tube 2 are such that the outer diameter of the main body 21 is 101.6 mm and the inner diameter of the main body 21 is 97.6 mm (thickness 2 mm). The inner tube 1 has a dimension of 89. 1 mm, the inner diameter of the main body 11 is 85. 1 mm (thickness 2 mm). That is, the radial gap between the intermediate tube 2 through which the target fluid flows and the inner tube 1 is 4.25 mm. The material of all of the inner tube 1, the intermediate tube 2, and the outer tube 3 was SUS304.
Eight fins F1 (width 3 mm, height 15 mm, length 200 mm) were respectively installed on the front side and the rear side of the inner peripheral surface of the main body 11 of the inner tube 1 by all-around welding. Further, 24 fins F2 (width 3 mm, height 15 mm, length 690 mm) were installed on the outer peripheral surface of the main body 21 of the intermediate tube 2 by all-around welding. The material of the fins F1 and F2 was also SUS304.
As the heat medium flow path, a heat medium inlet T1 is installed in the intermediate tube 2, a heat medium outlet T2 is installed in the inner tube 1, a heat medium inlet T3 and a heat medium outlet T4 are installed in the outer tube 3, and the heat medium inlet T1 and the heat medium outlet are installed. The heat medium was allowed to flow in the order of T2, heat medium inlet T3, and heat medium outlet T4. The total heat transfer area is about 1 m ² . The target fluid inlet S1 and the target fluid outlet S2 are installed in the intermediate pipe 2 as the target fluid flow path, and the target fluid is flowed in the order of the target fluid inlet S1 and the target fluid outlet S2. The total heat transfer area is about 0.44 m ² .
A 2% by weight cellulose aqueous dispersion was used as the target fluid. The flow rate of the target fluid is 8 L / min, and the viscosity is about 7000 mPa · s. As the heat medium, cooling water was used to cool the target fluid. The flow rate of the heat medium is 35 L / min.

  Table 1 shows the results of measuring the piping temperature at each of the heat medium inlet T1, the heat medium outlet T2, the heat medium inlet T3, the heat medium outlet T4, the target fluid inlet S1, and the target fluid outlet S2.

  As shown in Table 1, the temperature of the target fluid and the temperature of the heat medium were changed. It was found that the target fluid could be cooled from 100 ° C. to 38.1 ° C. (pipe temperature), and good heat exchange was performed. Further, after the test, the inner tube 1 and the intermediate tube 2 were detached from each other and easily disassembled and cleaned. Furthermore, even when the pressure of the target fluid is 10 MPa, the sealing members 54 and 55 that are O-rings are used, and the inner tube 1 and the intermediate tube 2 are fastened with six M8 bolts, so that sufficient sealing performance is obtained. It was confirmed that it could be secured.

1,1a Inner pipe (first pipe)
DESCRIPTION OF SYMBOLS 11, 11a Main body part 12 Large diameter part 12a Lid part 13, 13a Rear end part 14, 14a Outer peripheral part 15, 16 Groove 17 Introducing pipe 18 Passage 2, 2a Intermediate pipe (second pipe)
21, 21a Main body part 22, 22a Front large diameter part 23, 23a Front end part 24, 24a Rear large diameter part 3 Outer pipe (third pipe)
31 Body portion 32 Front large diameter portion 33 Rear large diameter portion 34, 36 Installation surface 35, 37 Hole 51 First heat medium flow channel 52 Second heat medium flow channel 53 Target fluid flow channel 54, 55 Seal Member 56 Bolt 57, 58 Boss part 100, 100a Triple tube heat exchanger F1, F1a Fin F2, F2a Fin S1 Target fluid inlet S2 Target fluid outlet T1 Heat medium inlet T2 Heat medium outlet T3 Heat medium inlet T4 Heat medium outlet

Claims (5)

A first tube;
A second tube having a bottomed cylindrical shape covering a radially outer side of the first tube;
A third tube covering a radially outer side of the second tube,
A first heat medium flow path through which the heat medium passes is formed on a radially inner side of the first pipe;
A second heat medium flow path through which the heat medium passes is formed between the second pipe and the third pipe,
Between the first pipe and the second pipe, a target fluid flow path is formed through which the target fluid to be cooled or heated passes.
The first tube is provided on the opposite side of the main body portion from the side of the main body portion where the second tube is open, and has a large cylindrical diameter with an outer diameter larger than that of the main body portion. And comprising
An annular groove is formed on the outer peripheral surface of the large-diameter portion, and a seal member that seals between the first tube and the second tube is attached to the groove,
The first tube and the second tube are detachably fixed at an end portion on the side where the second tube is open in the axial direction;
Triple-tube heat exchanger characterized by The first heat medium flow path extends in the axial direction in the first pipe,
A heat medium inlet through which the heat medium is introduced at one end of the first heat medium flow path;
The triple pipe heat exchanger according to claim 1 , wherein a heat medium outlet through which the heat medium is discharged is provided at the other end of the first heat medium flow path. At least one of the flow direction of the heat medium passing through the first heat medium flow path and the flow direction of the heat medium passing through the second heat medium flow path, and the flow of the target fluid passing through the target fluid flow path The triple-tube heat exchanger according to claim 1 or 2 , wherein the direction is set in the opposite direction. The triple pipe heat exchanger according to any one of claims 1 to 3 , wherein a plurality of fins are arranged on an inner surface of the first pipe. The triple pipe heat exchanger according to any one of claims 1 to 4 , wherein a plurality of fins are arranged on an outer surface of the second pipe.

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