JP2019184078A - Multiple pipe type cooler - Google Patents

Abstract

To simplify a drawing motion of a pipe connected to a multiple pipe type cooler, save a space for it and at the same time facilitate assurance of a flow passage for external fluid.SOLUTION: Vertical partition parts 5g define several vertical spaces A, B extending in an axial direction within a peripheral space formed between an inner pipe and an outer pipe to define the peripheral space. A first communication port 5h causes the adjoining vertical spaces A, B in the peripheral space to communicate with each other in order to define an internal continuous flow passage while fluid to be heat exchanged between it and external fluid is returned back in an axial direction. Lateral partition parts 5i extend in at least one vertical space B in a peripheral direction to define several lateral spaces b1 to b6 defining the vertical space B. The second communication ports 5j cause the adjoining lateral spaces to communicate with each other in the vertical spaces in order to define continuous internal flow passages where fluid in the vertical space B flows while being folded back in a peripheral direction in the vertical space B.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a multi-tube cooler that cools an external fluid to be cooled through a surface.

  Conventionally, as an alternative to a coil heat exchanger, a multi-tube heat exchanger is known in which an exposed surface functions as a heat exchange surface and performs heat exchange between an internal fluid and an external fluid. For example, Patent Document 1 discloses a double-tube heat exchanger in which a spiral flow path 22 is provided in an internal space between an inner tube 20 and an outer tube 21, as shown in FIG. . The water W flowing between the inner tube 20 and the outer tube 21 is guided in one direction from one end of the heat exchanger to the other end while spirally swirling along the shape of the spiral flow path 22. Heat exchange is performed with the refrigerant X flowing in the pipe 21.

  Patent Document 2 discloses a double-tube heat exchanger in which an internal space between an inner tube and an outer tube is partitioned by a partition as shown in FIG. The partition includes a body portion fitted on the outer periphery of the inner tube, and a plurality of fins extending in the radial direction from one end of the body portion. Each fin has an excision part in which a part of the disk is cut out. In other words, the excision part is offset 180 degrees in the circumferential direction so that the excision part is staggered with respect to the longitudinal direction. Are arranged as follows. As a result, the water flowing between the inner pipe and the outer pipe is guided in one direction from one end of the heat exchanger to the other end while turning 180 degrees according to the position of the cut portion provided in the fin, Heat exchange is performed with the flowing refrigerant.

JP 2001-201275 A JP-A-2005-90926

  In the conventional technology described above, the fluid flowing between the inner tube and the outer tube is guided in one direction from one end of the cooler (heat exchanger) to the other end. Therefore, it is necessary to connect an introduction pipe for introducing fluid to one end side of the cooler and to connect a discharge pipe for discharging fluid to the other end side. For example, when these pipes are concentrated on the lower end side of the cooler, it is necessary to route the pipes connected to the upper end side downward, so that it is necessary to secure a pipe space correspondingly. This hinders simplification of the overall system incorporating the cooler. In addition, the pipe protruding to the outside of the cooler becomes an obstacle to securing a flow path of the external fluid that contacts the surface of the cooler.

  The present invention has been made in view of such circumstances, and an object thereof is to simplify the routing of piping connected to a multi-tube cooler to save space and to easily secure a flow path for an external fluid. Is to do.

  In order to solve this problem, the present invention has an inner tube, an outer tube, a plurality of vertical partition portions, and at least one first communication port, and external fluid to be cooled is passed through the surface. A cooling multi-tube cooler is provided. The outer tube is disposed outside the inner tube with a space therebetween. The vertical partition extends in the circumferential direction between the inner tube and the outer tube in the axial direction, and defines a plurality of vertical spaces that divide the circumferential space. The first communication port communicates the adjacent vertical spaces in the circumferential space in order to define a continuous internal flow path through which the refrigerant that cools the external fluid flows while turning back in the axial direction.

  Here, in the present invention, provided on one end side of the multi-tube cooler, provided on the same end side as the inlet of the multi-tube cooler, and an inlet for introducing the refrigerant into the internal flow path And a discharge port for discharging the refrigerant flowing through the internal flow path. In this case, it is preferable that the introduction port and the discharge port are provided on the lower end side of the multi-tube cooler.

  In the present invention, a plurality of horizontal partition portions and at least one second communication port may be further provided. The horizontal partition portion extends in the circumferential direction in at least one vertical space, and defines a plurality of horizontal spaces that divide the vertical space. The second communication port communicates between the adjacent lateral spaces in the vertical space in order to define a continuous internal flow path in which the fluid flows while turning back in the circumferential direction in the vertical space.

  In the present invention, at least one of the outer tube and the inner tube may be constituted by a plurality of members divided along at least one attachment line of the vertical partition and the horizontal partition. In this case, the vertical partition portion may be a side portion of the vertical outer tube attached to the outer peripheral surface of the inner tube along the axial direction. Moreover, the member which comprises the said outer tube | pipe may be provided with the escape part for avoiding a vertical outer tube | pipe. Moreover, the said horizontal partition part may have the cyclic | annular shape provided with the escape part for avoiding a vertical outer tube | pipe. Furthermore, the said horizontal partition part may be arrange | positioned offset in the circumferential direction so that the one end and other end of a relief part may contact the side part of a vertical outer tube | pipe alternately.

  According to the present invention, a plurality of vertical partition portions are provided in a circumferential space formed between the inner tube and the outer tube, and the multi-tube cooling is performed by flowing the coolant that cools the external fluid in the axial direction. The piping connected to the vessel can be simplified. As a result, the entire system incorporating the multi-tube cooler can be saved in space, and it is easy to secure a flow path for the external fluid that flows outside the multi-tube cooler.

Perspective view of cooling device The figure which shows the flow of the fluid inside a cooling device External perspective view of multi-tube cooler Explanatory diagram of assembly procedure for multi-tube cooler Explanatory diagram of assembly procedure for multi-tube cooler Explanatory diagram of assembly procedure for multi-tube cooler Explanatory diagram of assembly procedure for multi-tube cooler Explanatory diagram of assembly procedure for multi-tube cooler Illustration of internal flow path of multi-tube cooler Illustration of internal flow path of multi-tube cooler Explanatory drawing of the internal flow path of the multi-tube cooler according to the modification Illustration of prior art Illustration of prior art

  FIG. 1 is an exploded perspective view of a cooling device incorporating a multi-tube cooler. This cooling device 1 is used for the purpose of cooling an external fluid (water or the like) to be cooled, for example. The cooling device 1 may be used by being placed in a storage tank that stores an external fluid, or may be used in contact with a pipe through which the external fluid flows without being placed in the storage tank. In addition, although the figure has shown the state which expanded each member a little in the axial direction so that the positional relationship of the members which comprise the cooling device 1 can be understood easily, in fact, The plurality of members 2, 3, 5 are completely accommodated inside, and the opening at the upper end is closed by the transparent lid 6.

  The cooling device 1 has a plurality of tubes 2 to 4 and a multi-tube cooler 5, which are arranged inside and outside in the radial direction. In this embodiment, a total of three tubes are arranged, two inside the multi-tube cooler 5 and one outside. Specifically, the first inner tube 2 is disposed on the axis of the cooling device 1. The second inner pipe 3 is arranged on the outer side in the radial direction of the first inner pipe 2 at a predetermined interval so as to surround the entire circumference. A multi-tube cooler 5 is disposed outside the second inner pipe 3 in the radial direction so as to surround the entire circumference of the second inner pipe 3 at a predetermined interval. Further, an outer tube 4 is arranged on the outer side in the radial direction of the multi-tube cooler 5 with a predetermined interval so as to surround the entire circumference. As described above, the opening at the upper end is closed by the transparent lid 6 in a state where the three tubes 2 to 4 and the multi-tube cooler 5 are arranged concentrically. The reason for using the transparent lid 6 is to make it possible to visually check the internal state from the outside during operation of the cooling device 1, thereby disassembling whether or not fluid coagulation has occurred in the internal flow path. Can be determined without any problem.

  FIG. 2 is a diagram illustrating the flow of the fluid in the cooling device 1. The fluid (cooling target) supplied from the axial inlet pipe 9 flows upward in the axial direction through a flow path 10 a formed in the first inner pipe 2. The fluid guided to the upper end side through the flow path 10a is uniformly guided over the entire circumference radially outward through the communication port 11a on the upper end side, and then moves downward in the axial direction through the flow path 10b. Flowing. The fluid guided to the lower end side through the flow path 10b is uniformly guided over the entire circumference radially outward through the communication port 11b on the lower end side, and then the inner flow path 10c is moved upward in the axial direction. It flows toward. Since the inner flow path 10c is in contact with the multi-tube cooler 5, the space between the refrigerant flowing in the heat exchanger 5 (including brine for cooling water) and the fluid flowing in the inner flow path 10c. The heat exchange takes place at this point, thereby cooling the external fluid. The fluid guided to the upper end side through the inner channel 10c is uniformly guided over the entire circumference radially outward through the communication port 11c on the upper end side, and then the outer channel 10d is moved downward in the axial direction. It flows toward. Since the outer flow path 10d is in contact with the multi-tube cooler 5 similarly to the inner flow path 10c, the fluid flowing through the outer flow path 10d is further cooled. Then, the fluid guided to the lower end side through the outer flow path 10d is uniformly discharged over the entire circumference radially outward through the communication port 11d (release port) on the lower end side. Thus, in the inner flow paths 10a to 10d of the cooling device 1, the fluid is guided radially outward while reciprocating in the axial direction.

  FIG. 3 is an external perspective view of the multi-tube cooler 5 according to the present embodiment. This multi-tube cooler 5 is made of a metal having high thermal conductivity, and exchanges heat between the refrigerant flowing inside itself and water, which is an external fluid, through a surface exposed to the outside. Do. The heat exchanger 5 has an inner tube 5a and an outer tube 5b arranged concentrically, and the outer tube 5b is arranged outside the inner tube 5a with a predetermined interval. The feature of the heat exchanger 5 according to the present embodiment is that, first, the refrigerant flows while turning back in the axial direction (longitudinal direction) of the heat exchanger 5 inside the heat exchanger 5. Secondly, there are an inlet 5c to which a pipe for introducing a refrigerant into the heat exchanger 5 is connected, and an outlet 5d to which a pipe for discharging the refrigerant from the inside of the heat exchanger 5 is connected. The heat exchanger 5 is provided on one end side, typically on the lower end side of the heat exchanger. For example, if the refrigerant introduced from the lower end side introduction port 5c is folded once on the upper end side, the refrigerant can be discharged from the lower end side discharge port 5d. In addition, if the total of the upper end side, the lower end side, and the upper end side is folded three times, the refrigerant can be discharged from the lower end discharge port 5d. That is, if the number of fluid foldings is an odd number, introduction and discharge of the refrigerant can be realized on the same end side.

  Hereinafter, the internal structure of the multi-tube cooler 5 will be described in detail based on the assembly procedure of FIGS. Basically, the members described below are attached by welding in order to prevent refrigerant leakage. First, as shown in FIG. 4, a cylindrical inner tube 5a substantially corresponding to the height of the heat exchanger 5 is attached to the upper surface of the disc-shaped bottom plate 5e. The opening that vertically penetrates the center of the bottom plate 5e guides external fluid to the inner peripheral surface of the multi-tube cooler 5, that is, the inner peripheral surface of the inner tube 5a, and this inner peripheral surface is also used as a heat exchange surface Is provided to do.

  Next, as shown in FIG. 5, the longitudinal outer tube 5f is attached to the outer peripheral surface of the inner tube 5a so as to extend along the axial direction. The vertical outer pipe 5f extends linearly and has a substantially U-shaped or substantially U-shaped cross section. The left and right bent side portions of the vertical outer tube 5f function as two vertical partition portions 5g described later, and the main surface connecting them forms a part of the outer tube 5b in the multi-tube cooler 5. An inlet 5c for introducing fluid into the inside is provided on the lower end side of the vertical outer pipe 5f, and a first communication port 5h is provided on the upper end side so as to face the side. Yes. The vertical outer pipe 5f functions as an internal flow path that guides the fluid flowing in from the lower-end-side introduction port 5c in the axial direction (upward) and discharges it from the upper-end-side communication port 5h.

  Next, as shown in FIG. 6, after the lowermost (first stage) horizontal partition 5i is fitted from above, the horizontal partition 5i is formed on the outer peripheral surface of the inner tube 5a using a jig or the like. It is attached so as to extend in the circumferential direction. The horizontal partitioning portion 5i has an annular shape (that is, a substantially C shape) provided with a relief portion for avoiding the vertical outer tube 5f. A width W1 of the escape portion is set to be larger than a width W2 of the vertical outer tube 5f. For the lowermost stage (odd number stage), the horizontal partition 5i is arranged counterclockwise so that the left end of the escape portion is in contact with the left side of the vertical outer pipe 5f. Thereby, the gap generated between the right end of the escape portion and the right side portion of the vertical outer pipe 5f functions as a second communication port 5j that communicates vertically.

  Next, as shown in FIG. 7, the lower outer tube 5k is fitted to the outer peripheral surface of the inner tube 5a after the lowermost (first stage) short outer tube 5k is fitted from above. The short outer tube 5k has an annular shape (that is, a substantially C-shaped cross section) provided with a relief portion for avoiding the vertical outer tube 5f. However, unlike the horizontal partitioning portion 5i, the width of the escape portion of the short outer tube 5k is set substantially equal to the width W2 of the vertical outer tube 5f. The short outer tube 5k forms a part of the outer tube 5b in the multi-tube cooler 5, and the circumferential space formed between the inner tube 5a and the short outer tube 5k is an inner portion that turns the fluid in the circumferential direction. Functions as a flow path. The lowermost short outer tube 5k is provided with a discharge port 5d for discharging the fluid flowing through the internal flow path to the outside.

  In the second and subsequent stages, as in the first stage, the horizontal partitioning portion 5i and the short outer tube 5k are attached (see FIG. 8). However, the horizontal partitioning portions 5i in each stage are arranged offset in the circumferential direction so that one end and the other end of the escape portion are alternately in contact with the side portion of the vertical outer tube 5f. That is, for odd-numbered stages, the horizontal partition 5i is arranged counterclockwise so that the left end of the escape part is in contact with the left side of the vertical outer pipe 5f. The horizontal partitioning portion 5i is disposed close to the right side of the tube 5f in a clockwise direction. Thereby, in the odd-numbered stages, the fluid swirls counterclockwise in the circumferential space formed between the inner pipe 5a and the short outer pipe 5k, and in the even-numbered stages, the fluid swirls clockwise in this circumferential space. Will do.

  Then, as shown in FIG. 8, after the peripheral space exposed at the upper end is closed with a ring-shaped top plate 5l, the uppermost (sixth stage) short outer tube 5k is attached. In the present embodiment, in order to improve the strength of the multi-tube cooler 5, the uppermost short outer tube 5k uses a complete cylindrical body that does not have an escape portion. In this case, in order to avoid interference with the uppermost short outer tube 5k, the longitudinal outer tube 5f is preferably formed to have a thinner cross section than the first to fifth stages. As a result, the multi-tube cooler 5 shown in FIG. 3 is completed. As is clear from the above description, the outer tube 5b shown in FIG. 3 includes a vertical outer tube 5f and a plurality of short outer tubes 5k stacked in the axial direction. In other words, the outer tube 5b has a structure that is divided into a plurality of members (short outer tubes 5k) along the attachment lines (welding lines) of both the vertical partition portion 5g and the horizontal partition portion 5i.

  FIG. 9 and FIG. 10 are explanatory diagrams of the internal flow path of the multi-tube cooler 5. In this specification, “vertical” refers to the axial direction of the multi-tube cooler 5, and “horizontal” refers to the circumferential direction of the multi-tube cooler 5. The figure shows a case where the multi-tube cooler 5 is used in a vertical position, but it may be used in a horizontal position (the definitions of “vertical” and “horizontal” are also used in the horizontal position). does not change.). The two vertical partition portions 5g extend in the axial direction a circumferential space formed between the inner tube 5a and the outer tube 5b, and divide the circumferential space into two vertical spaces A and B. The vertical space A is defined by the vertical outer pipe 5f described above, and the fluid introduced from the inlet 5c on the lower end side flows upward. The vertical space B is defined by the short outer tube 5k, and the fluid flows downward and is discharged from the discharge port 5d on the lower end side. Since the adjacent vertical spaces A and B in the circumferential space communicate with each other via the first communication port 5h, one continuous internal flow path in which the fluid flows while turning back in the axial direction is formed. Note that the refrigerant may flow in the reverse direction in the multi-tube cooler 5 by reversing the input and output of the inlet 5c and the outlet 5d.

  On the other hand, the plurality of horizontal partition portions 5i extend in the circumferential direction in the vertical space B, and divide the vertical space B into a plurality of horizontal spaces b1 to b6 (spaces corresponding to the above-described levels). ing. The adjacent horizontal spaces (for example, b5 and b6) in the vertical space B communicate with each other through the second communication port 5j. Since the second communication ports 5j adjacent in the vertical direction are offset by about 360 degrees (actually, it is smaller by the width of the vertical outer tube 5f), the fluid flows in the circumferential direction in each step b1 to b5 of the vertical space B. A continuous internal flow path that flows while alternately turning back (i.e., alternately repeating a clockwise rotation of about 360 degrees and a counterclockwise rotation of about 360 degrees) is formed. The number of installed vertical partitioning portions 5g and horizontal partitioning portions 5i may be set as appropriate according to the heat exchange capacity and flow path diameter required for the multi-tube cooler 5.

  As described above, according to the present embodiment, a plurality of vertical partition portions 5g are provided in the peripheral space formed between the inner tube 5a and the outer tube 5b, and the external fluid that flows outside the multi-tube cooler 5 is provided. By flowing the coolant that cools (water) in the axial direction, the piping connected to the multi-tube cooler 5 can be simplified. As a result, the entire space of the cooling device 1 incorporating the multi-tube cooler 5 can be saved, and it is easy to secure and design the external fluid flow path.

  Further, according to the present embodiment, the inner peripheral surface of the inner tube 5a and the outer peripheral surface of the outer tube 5b, that is, the exposed surface of the multi-tube cooler 5 can be used as a heat exchange surface. Compared with the cooling coil which has, the improvement of heat exchange efficiency can be aimed at.

  Further, by disposing the inlet 5c and the outlet 5d on the same end side of the multi-tube cooler 5, more preferably on the lower end side, it is easy to disassemble the cooling device 1 with the removal of the upper transparent lid 6 Therefore, the maintainability can be improved. The introduction port 5c and the discharge port 5d may be provided in the inner tube 5a instead of the outer tube 5b, or may be provided in the bottom plate 5e.

  Further, according to the present embodiment, the outer tube 5b is configured by a plurality of members (short outer tube 5k) divided along the attachment line (welding line) of the horizontal partition 5i. The “attachment line” is a line in which the edge of the horizontal partition 5i and the edge of the vertical partition 5g are in contact with the inner tube 5a and the outer tube 5b. Since the outer tube 5b has a divided structure, the number of stacked stages can be arbitrarily set, so that the degree of freedom in design can be improved and the assembly workability in welding or the like can be improved. A similar division structure may be adopted for the inner tube 5a. In other words, the inner pipe 5a may be constituted by a plurality of members divided along the attachment line (welding line) of the vertical partition portion 5g.

  Furthermore, according to the present embodiment, a plurality of horizontal partitions 5i are provided in at least one vertical space B, and these are communicated with each other via the second communication port 5j, so that fluid can flow in the vertical space B. A continuous internal flow path that flows while turning back in the circumferential direction is formed. Thereby, since the flow path length and flow path diameter in the internal flow path of the multi-tube cooler 5 can be arbitrarily set, the degree of freedom in designing the multi-tube cooler 5 can be improved. However, when the flow path diameter is small as in the vertical space A, it is not always necessary to provide the horizontal partition portion 5i.

  In the above-described embodiment, the vertical outer tube 5f having the functions of both the vertical partition portion 5g and the outer tube 5b is used in order to increase the efficiency of assembly work and reduce the number of members. However, the present invention is not limited to this, and linear strips extending in the axial direction may be individually attached as the vertical partition portions 5g for partitioning the axial direction. FIG. 11 is an explanatory diagram of the internal flow path of the multi-tube cooler 5 according to the modification. In this example, in the circumferential space between the inner tube 5a and the outer tube 5b, four vertical partition portions 5g are arranged at intervals of 90 degrees, and are divided into four vertical spaces A to D. The vertical spaces adjacent to each other in the circumferential direction communicate with each other by the first communication port 5g (not shown) described above in order to define a continuous internal flow path through which the refrigerant that cools the external fluid flows in the axial direction. is doing. In this case, it is preferable to divide the outer tube 5b into four along the attachment lines (welding lines) of the respective vertical partition portions 4g, and attach the four plate members 5m having a cross section of approximately 90 degrees to the outer periphery. Thereby, the assembly workability | operativity in welding etc. of the vertical partition part 5g can be improved. The number of divisions of the circumferential space may be appropriately set according to the specifications required for the multi-tube cooler 5, and when dividing the circumferential space into n pieces (n is 2 or more), n vertical partition portions 5g May be arranged.

DESCRIPTION OF SYMBOLS 1 Cooling device 2 1st inner pipe 3 2nd inner pipe 4 Outer pipe 5 Multiple pipe type cooler 5a Inner pipe 5b Outer pipe 5c Inlet 5d Discharge port 5e Bottom plate 5f Vertical outer pipe 5g Vertical partition 5h First Communication port 5i Horizontal partition 5j Second communication port 5k Short outer tube 5l Top plate 5m Plate member 6 Transparent lid 8 Partition 9 Inlet tube 10a to 10e Flow path 11a to 11d Communication port

Claims (9)

In a multi-tube cooler that cools the external fluid to be cooled through the surface,
An inner pipe,
An outer tube disposed at an interval outside the inner tube;
A plurality of vertical partitioning portions that extend in the axial direction in a circumferential space between the inner tube and the outer tube, and define a plurality of vertical spaces that divide the circumferential space;
In order to define a continuous internal flow path in which the refrigerant that cools the external fluid flows while being folded back in the axial direction, at least one first communication port that communicates between the adjacent vertical spaces in the peripheral space is provided. A multi-tube type cooler comprising: An inlet provided on one end side of the multi-tube cooler for introducing a refrigerant into the internal flow path;
2. The multiple pipe according to claim 1, further comprising: a discharge port that is provided on the same end side as the introduction port in the multiple tube cooler and discharges the refrigerant that has flowed through the internal flow path. Type cooler.   The multi-tube cooler according to claim 2, wherein the introduction port and the discharge port are provided on a lower end side of the multi-tube cooler. A plurality of horizontal partition portions extending in the circumferential direction in at least one of the vertical spaces and defining a plurality of horizontal spaces dividing the vertical space;
In order to define a continuous internal flow path in which the fluid flows while turning back in the circumferential direction in the vertical space, at least one second communication port that connects the adjacent horizontal spaces in the vertical space is further provided The multi-tube type cooler according to any one of claims 1 to 3, wherein the multi-tube type cooler is provided.   The at least one of the outer tube and the inner tube is constituted by a plurality of members divided along an attachment line of at least one of the vertical partition and the horizontal partition. The multi-tube type cooler described in any of the above.   6. The multi-tube cooler according to claim 5, wherein the vertical partition portion is a side portion of a vertical outer tube attached to the outer peripheral surface of the inner tube along the axial direction.   The multi-tube type cooler according to claim 6, wherein the member constituting the outer pipe includes an escape portion for avoiding the vertical outer pipe.   The multi-tube type cooler according to claim 6, wherein the horizontal partition has an annular shape having a relief portion for avoiding the vertical outer pipe. The said horizontal partition part is offset and arrange | positioned in the circumferential direction so that the one end and the other end of the said escape part may contact the side part of the said vertical outer tube | pipe alternately. Multi-tube cooler.

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