JP3569787B2 - Multi-tube evaporator - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a multitubular evaporator for vaporizing liquefied oxygen, liquefied nitrogen, liquefied argon, and the like.
[0002]
[Prior art]
Vertical evaporator tubes made of extruded aluminum with radially provided plate-like fins extending in the tube axis direction on the outer peripheral surface are arranged in front, rear, left and right. They were connected by welding through a joint plate. These vertical evaporator tubes are connected via a connecting pipe so that the liquefied gas flows in series from the vertical evaporator tube on the inlet side to the vertical evaporator tube on the outlet side, and while the liquefied gas sequentially flows through these vertical evaporator tubes. In addition, the air is heated by an external natural convection and is evaporated.
[0003]
Further, as other multi-tube evaporators, vertical evaporator tubes made of an extruded aluminum material, in which plate-like fins extending in the tube axis direction on the outer peripheral surface are radially provided in the same manner as described above, are arranged in front, rear, left and right. Further, unlike the above, a curved portion is formed on the outer edge of the plate-shaped fin over the entire length thereof, and the middle portion is cut out while leaving both upper and lower ends of the curved portion, so that the plate-shaped adjacent vertical evaporating tubes are formed. A fin in which bent portions at upper and lower ends are welded to each other has already been known (Japanese Utility Model Publication No. 58-12057).
[0004]
[Problems to be solved by the invention]
Among the conventional multi-tube evaporators, in the former, when plate-like fins of adjacent vertical evaporation tubes are welded to each other by a joint plate, one end of the joint plate is welded to a plate-like fin of one vertical evaporation tube. And welding the other end of the joint plate to the plate-shaped fin of the other vertical evaporator tube is required. This welding work is performed on all the upper and lower portions of the adjacent vertical evaporator tubes, which requires much labor. There was a problem that required.
[0005]
In the latter case, the fins of the adjacent vertical evaporator tubes are directly welded to each other without using a joint plate, so that the above-described problem does not occur. There was a drawback that the notch work required time and effort.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-tube evaporator in which adjacent vertical evaporator tubes can be connected with each other by a short welding operation and no fin cutting operation is required.
[0007]
[Means for Solving the Problems]
The invention of claim 1 includes a plurality of vertical evaporator tubes is provided in parallel with a predetermined interval and fro consisting double tube with a stainless steel inner tube and the aluminum extruded profile made outer tube, with the liquefied gas introduction side disposed to the left of the rectangular top and bottom frames from the left to be the vaporizing portion as viewed from the first row and the second row of vertical evaporator tubes is flat, vertical evaporator tubes of the third row and subsequent matches in the vertical frame body is the multi-tube evaporator and an outer tube, a plurality of plate-like fins outer pipe while away that provided radially extending pipe axis direction shorter and the outer peripheral surface than the length of the inner tube in both the outer numerous plate-like fins and connecting outer pipe bending portion is formed on the four outer edges of the fins protruding to the left and right front and rear of and a number of plate-shaped fins disposed radially extending tube axis direction on the peripheral surface two are composed of a vertical evaporation tube of the first column, connecting outer tube in the central portion of the inner tube And the outer tubes for separation are fitted above and below the vertical tubes. The vertical evaporation tubes in the second and third rows are connected with the outer tubes for connection at the upper and lower ends and the center of the inner tube. The outer tubes for the separation are fitted between the outer tubes for use, and the outer tubes for the fourth and subsequent rows have the outer tubes for connection fitted to the upper and lower ends of the inner tube, and the outer tubes for separation are provided between the two outer tubes for connection. tube fitted, further longitudinal and in the lateral direction and the protruding end comrades of the curved portion of the connecting outer tube adjacent is brought welding, first column and the second row of vertical evaporator tubes The fin height of the plate-shaped outer fin and the plate-shaped fin excluding the curved portion of the connecting outer tube in the vertical evaporating tubes of the third and subsequent rows is equal to the plate-shaped fin of the separating outer tube and the connecting outer tube. It is larger than the fin height of the plate-like fin except for the curved portion of the tube .
[0008]
According to a second aspect of the present invention, in the multi-tube type evaporator according to the first aspect, the curved portion (6) formed on the outer edge of the fin of the connecting outer tube (7) is welded and crossed by adjacent ones. The shape is such that the surface becomes substantially S-shaped.
According to a third aspect of the present invention, in the multi-tube evaporator according to the first aspect, the inner diameter of the outer pipe for separation (4) and the outer pipe for connection (7) is slightly larger than the outer diameter of the inner pipe (2). Heat the tube between adjacent fins in the radial fins (3 ) of the outer tube (4) and the tube between adjacent fins in the radial fin (5) of the connecting outer tube (7) with a torch. As a result, the portion is melted, and when the melted portion solidifies, the outer tubes (4) and (7) contract and are connected to the inner tube (2) .
[0009]
[Action]
According to the multi-tube evaporator of the present invention, the outer tube is a separation outer tube in which a number of plate-like fins are both radially provided that are shorter than the length of the inner tube and extend in the tube axis direction on the outer peripheral surface. A large number of plate-like fins extending in the tube axis direction are radially provided on the outer peripheral surface, and a curved outer portion is formed at the outer edges of four fins protruding forward, backward, left and right among the many plate-like fins. The vertical evaporator in the first row is an inner tube The outer tube for connection is fitted in the center of the tube, and the outer tube for separation is fitted on the upper and lower sides thereof. The vertical evaporation tubes in the second and third rows are connected to the upper and lower ends and the center of the inner tube. The outer tubes are fitted together, the separating outer tubes are fitted between the connecting outer tubes, and the evaporating tubes of the fourth and subsequent rows are fitted with the connecting outer tubes at the upper and lower ends of the inner tube, and are connected to both connecting tubes. The outer tube for separation is fitted between the outer tubes, and the protruding ends of the curved portions of the outer tubes for connection adjacent in the front-rear direction and the left-right direction are welded to each other. The connection can be performed with a smaller number of weldings than the conventional one using the joint plate, and the air separating window can be obtained between the adjacent vertical steaming tubes without the conventional fin notching work.
The fin heights of the plate-like fins of the separation outer tube and the plate-like fins except for the curved portion of the connection outer tube in the vertical evaporation tubes of the first and second rows are vertical in the third and subsequent columns. The heat transfer area of the plate fins of the separation outer tube and the plate fins excluding the curved portion of the connection outer tube in the evaporator tube is larger than the fin height of the former fin than that of the latter fin.
[0010]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification, front / rear, left / right / up / down is based on FIG. 7; front means the front side of the drawing sheet of FIG. 7, rear means the same back side, left and right means the left and right sides of FIG. 7, respectively.
[0011]
Multitubular evaporator illustrated, a number of vertical evaporator tubes is provided in parallel with a predetermined interval and fro consisting double tube with a stainless steel inner tube and the aluminum extruded profile made outer pipe, the liquefied gas introduction The first and second rows of vertical evaporation tubes (1a) and (1b) from the left, which are vaporizers on the side, are arranged on the left side of the rectangular upper and lower frame members (8) as viewed from the plane , and the third row The subsequent vertical evaporation tubes (1b) (1c) are housed in the upper and lower frames (8) . Then, the outer tube, both the inner tube (2) of the length from the short and eight plate-shaped fins extending to the outer peripheral surface in axial direction of the tube (3) is outside the pipe while away that provided radially and (4) , the curved portion to the outer edge of the four fins protruding to the left and right front and rear of the eight plate-shaped fins extending outer peripheral surface axial direction of the tube (5) is provided radially and eight plate-shaped fins (5) ( 6) are composed of two kinds of connecting outer tube being formed (7), the first column of the vertical evaporator tubes (1a), as shown in Figure 1, the inner tube ( A connecting outer tube (7) is fitted in the center of 2) , and a separating outer tube (4) is fitted above and below the connecting outer tube (7). The vertical evaporation tubes (1b) in the second and third rows are shown in FIG. As shown in FIG. 2 , connecting outer tubes (7) are fitted to the upper and lower ends and the center of the inner tube (2) , and a separating outer tube (4 ) is provided between the connecting outer tubes (7). ) is fitted, the evaporation tube of the fourth and subsequent columns (1c) is shown in Figure 3 , The spacing for outer tube between the two connecting outer pipe with connecting outer tube in upper and lower end portions of the inner tube (2) is (7) is fitted (7) (4) is fitted, further longitudinal and lateral connecting outer tube adjacent in the direction the curved portion (7) protruding end comrades (6), has been brought welding as shown in FIGS. 5 and 6, the first row and the second column Fin height of the plate-shaped fin (3) excluding the curved fin (5) of the outer tube for separation (4 ) and the curved portion (6) of the outer tube for connection (7) in the vertical evaporation tubes (1a) (1b) As shown in FIG. 6, the plate-like fins (3) and the connecting outer tubes (7 ) of the separating outer tubes (4) in the third and subsequent vertical evaporation tubes (1a) (1b) are arranged as shown in FIG. ) Except for the fin height of the plate-like fin (5) excluding the curved portion (6) (in FIGS. 1, 2 and 7, the first and second vertical evaporation tubes (1a) in the first and second rows ). excluding the plate-like fin (3) and connecting outer tube spaced purpose outer tube in (1b) (4) curved portion (7) (6) Fin height of Jo fins (5), the vertical evaporator tubes of the third row and subsequent (1b) plate fin (3) and connecting outer tube spaced purpose outer tube in (1c) (4) (7) The fin height of the plate-like fin (5) excluding the curved portion (6) is shown to be the same for convenience, but is actually large as described above).
For even above SL any vertical evaporator tubes, the first inner tube (2) and spaced apart for outer tube having an inner diameter slightly larger than the outer diameter of which (4) and connecting outer tube (7) is as follows They are united. That is, the pipe portion between the two fins of the radial fin (3) in the outer tube for separation (4) and the pipe portion between the two fins of the radial fin (5) in the outer tube for connection (7) are torch. Heat . Then, the moiety is melted, the outer tube when the melted portion is solidified (4) (7) than is Ru is coupled to the inner tube (2) contracts.
According to the evaporator, with the introduction of the liquefied gas, vaporizer is thermally contracted, and thus the vertical evaporator tubes (1a) (1b), but distance (1c) is Ru narrow or, this time each connecting outer tube Since the curved portion (6) at the outer edge of the plate-like fin (5) of (7) is bent, the above-mentioned heat shrinking force is absorbed by this. As shown in FIG. 5, the curved portion (6) is formed so that adjacent members are welded to form a substantially S-shaped cross section.
[0012]
The vertical evaporation pipes (1b) and (1c) adjacent to each other in the third and subsequent rows stored in the frame (8) are sequentially connected alternately by a U-shaped connection pipe (9). Thus, a meandering passage is formed as a whole in the left-right direction.
[0013]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the multipipe evaporator of this invention , connection of an adjacent vertical evaporator tube can be performed with a welding number smaller than the conventional one by an outer tube for connection, and air between adjacent vertical evaporator tubes by an outer tube for separation. Since the flow window is obtained without the conventional fin notching operation, the production of the multi-tube evaporator is streamlined and the production cost is reduced.
Further, in the vertical evaporation pipes in the third and subsequent columns, the vertical evaporation pipes in the first and second rows are arranged from the plate-like fins of the separation outer pipe and the fins of the connection outer pipe in the vertical evaporation pipes. Since the plate-shaped fins of the outer tube for separation and the plate-shaped fins of the outer tube for connection have a larger heat transfer area, the frost formation of the vaporized portion in the multi-tube evaporator is prevented, A decrease in heat exchange performance can be prevented.
Furthermore, since the outer tube for separation and the outer tube for connection, which constitute the outer tube of the double tube and have mutually different cross-sectional shapes, are both made of extruded aluminum, the long ones each having a desired size can be obtained. By cutting and appropriately combining the two, the first, second, and third groups of the vertical evaporation tubes having different shapes in the longitudinal direction from each other in a large number of front, rear, left, and right vertical evaporation tubes. , The third and subsequent columns can be easily obtained.
[Brief description of the drawings]
FIG. 1 is a front view of a vertical evaporation tube in a first row in a multi-tube evaporator of the present invention.
FIG. 2 is a front view of the second and third vertical evaporation tubes in the multi-tube evaporator of the present invention.
FIG. 3 is a front view of the vertical evaporator tubes in the fourth and subsequent rows in the multi-tube evaporator of the present invention.
FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 1;
FIG. 5 is an enlarged cross-sectional view showing a connection state of adjacent connection outer tubes.
FIG. 6 is a schematic plan view showing a connected state of vertical evaporation tubes arranged in front, rear, left and right .
FIG. 7 is a front view of the multi-tube evaporator of the present invention.
[Explanation of symbols]
(1a) (1b) (1c) Vertical evaporator tube
(2) Inner pipe
(3) Plate fin
(4) Separation outer tube
(5) Plate fin
(6) Curved section
(7) Connection outer tube
(8) Frame

Claims (3)

Numerous vertical evaporator tubes is provided in parallel with a predetermined interval and fro consisting double tube with a stainless steel inner tube and the aluminum extruded profile made outer pipe, first from the left as a vaporizing portion in liquefied gas introduction side The vertical evaporation tubes (1a) and (1b) in the first and second rows are arranged on the left side of the rectangular upper and lower frames (8) as viewed from the plane , and the vertical evaporation tubes (1b) and In the multi-tube evaporator in which 1c) is housed in the upper and lower frames (8) , the outer tube has a number of plate-like fins both shorter than the length of the inner tube (2) and extending on the outer peripheral surface in the tube axis direction. (3) outside the pipe while away that provided radially (4), the outer large number of plate fins extending in the tube axis direction on the peripheral surface (5) is provided radially and multiple plate-like fins (5 ) is composed of two types of the curved portion to the outer edge of the four fins protruding and fro (6) outside the tube for connecting the formed (7) of the first column of the vertical evaporator tubes ( 1a) is in the inner tube (2) The outer pipe for connection (7) is fitted in the center and the outer pipe for separation (4) is fitted above and below it, and the vertical evaporation pipes (1b) in the second and third rows are connected to the inner pipe (2). ) , Outer connecting pipes (7) are fitted to the upper and lower ends and the center, and separating outer pipes (4) are fitted between the connecting outer pipes (7). In (1c) , the outer pipe for connection (7) is fitted to both upper and lower ends of the inner pipe (2) , and the outer pipe for separation (4) is fitted between both outer pipes for connection (7) , The protruding ends of the curved portions (6) of the connecting outer tubes (7) adjacent in the horizontal and horizontal directions are welded together, and the first and second rows of vertical evaporation tubes (1a) (1b) The fin height of the plate-like fin (5) excluding the curved part (6) of the plate-like fin (3) of the separating outer tube (4) and the connecting outer tube (7) in Plate-like excluding the plate- like fins (3) of the outer tube for separation (4 ) and the curved portion (6) of the outer tube for connection (7) in the evaporator tubes (1b) (1c) Multi-tube evaporator larger than the fin height of the fin (5) . Outer tube for connection (7) Curved portion formed on the outer edge of the fin (6) 2. The multi-tube evaporator according to claim 1, wherein adjacent pipes are welded to each other to form a substantially S-shaped cross section. Outer tube for separation (Four) And connecting outer tube (7) The inner diameter of the inner tube (2) Slightly larger than outer diameter, outer tube for separation (Four) Radial fins (3) Section between adjacent fins and outer pipe for connection (7) Radial fins (Five) By heating the tube portion between adjacent fins with a torch, the portion is melted, and when this melted portion solidifies, (4) (7) Shrinks the inner tube (2) 2. The multi-tube evaporator according to claim 1, wherein the evaporator is connected to a tube.

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