JPS5812036Y2 - Multi-tube liquid oxygen evaporator - Google Patents

Description

[Detailed description of the invention] This invention relates to a multi-tubular liquid oxygen evaporator.

This type of evaporator consists of a large number of vertical evaporator tubes arranged at predetermined intervals in the front-rear and left-right directions, and whose upper and lower ends are connected via joint plates, and adjacent evaporator tubes on the left and right sides are sequentially arranged vertically and alternately. It consists of a U-shaped connecting pipe that is connected to the evaporation pipes to form a meandering passage in the left and right direction as a whole, and rectangular upper and lower frames that surround and fix the upper and lower ends of the entire interconnected evaporation pipes. It is something.

By the way, liquid oxygen is introduced into the introduction header from the inlet pipe, flows through each meandering path, reaches the discharge side header, and is discharged from the outlet pipe, but while being introduced and discharged, In terms of its properties, it can be roughly divided into three regions: a boiling region, a gas low temperature region, and a gas high temperature region.

When the refrigerant is introduced from the inlet pipe through the introduction header into the evaporation pipe of the boiling section, these container pipes are rapidly cooled and contracted.

Since the inlet pipe is connected to a fixed pipe, shrinkage in the length direction of the inlet pipe causes the end of the evaporator pipe that communicates with the inlet header to be pulled away from the other evaporator pipes and bent toward the fixed pipe. do.

Therefore, if the evaporator tube in the boiling region, especially its lower end, is restrained, it will become strained and cause a failure.

On the other hand, as for the evaporator itself, make sure it is durable! Desired.

In view of the above points, the object of this invention is to provide a multi-tube liquid oxygen evaporator which is free from failure and is durable.

In order to achieve the above-mentioned purpose, the multi-tubular liquid oxygen evaporator according to this invention consists of a large number of tubes arranged at predetermined intervals in the front and rear and left and right directions, and whose upper and lower ends are connected via connecting plates. Vertical evaporation pipes, U-shaped connecting pipes in which adjacent evaporation pipes on the left and right sides are connected vertically and alternately to form a meandering passage as a whole in the left-right direction, and upper and lower ends of the entire interconnected evaporation pipes. A frame-fixed evaporation tube group comprising upper and lower rectangular frames enclosing and fixing the evaporation tube group, and communicating with each meandering passage of the evaporation tube group, arranged in the front and back direction to form the boiling region of liquid oxygen. It consists of a group of frame-separated evaporation tubes in which a plurality of rows of vertical evaporation tubes are connected to other evaporation tubes at portions other than the lower ends.

According to the multi-tube liquid oxygen evaporator of this invention, as mentioned above, the frame-fixed evaporator tubes, which constitute the main body of the evaporator, are arranged at predetermined intervals in the front-rear and left-right directions, and are A large number of vertical evaporation tubes whose upper and lower ends are connected together, and a U-shaped connecting tube in which adjacent evaporation tubes on the left and right sides are connected vertically and alternately to form a meandering passage as a whole in the left-right direction. The evaporator tube is made up of a conventional rectangular upper and lower frame that encloses and fixes the upper and lower ends of the entire evaporator tube, so it looks solid, and as a result, the evaporator as a whole becomes durable. .

On the other hand, the frame-separated evaporator tube group of the evaporator tubes is configured to communicate with each meandering passage of the frame-fixed evaporator tube group, and the plurality of vertical evaporator tubes lined up in the front-rear direction, which is the boiling region of liquid oxygen, are connected to all but the lower end. The evaporator tube is connected to other evaporator tubes at the section of the evaporator, and only the evaporator tube that is the boiling region of the entire evaporator is removed from the upper and lower frames, and the evaporator tubes in this region are not constrained by the frame and are Since the lower end portion is not connected to other evaporation tubes, it is possible to prevent the occurrence of the failure described at the beginning due to contraction of the tube due to introduction of refrigerant.

This invention will be explained below based on embodiments shown in the drawings.

In this specification, front, rear, left and right correspond to the drawing direction of FIG.

The multi-tube liquid oxygen evaporator according to this invention consists of a large number of vertical evaporation tubes 5 arranged at predetermined intervals in the longitudinal and lateral directions and whose upper and lower ends are connected via connecting plates 7, adjacent to each other on the left and right sides. a U-shaped connecting pipe 6 that connects matching evaporation pipes 5 vertically and alternately to form a meandering passage as a whole in the left-right direction;
and a frame-fixed evaporator tube group 1 comprising rectangular upper and lower frames 2 and 3 surrounding and fixing the upper and lower ends of the entire interconnected evaporation tubes 5; A frame in which multiple rows of vertical evaporation tubes 12.13 arranged in the front-rear direction and connected to other evaporation tubes 12.13 at a portion other than the lower end are communicated with a passage and serve as a boiling region of liquid oxygen. It consists of a separation evaporation tube group 32.

The evaporation tubes 5, 12, 13 are integrally provided with radial fins 4 extending in the length direction.

The joint plate 7 has an S-shaped layered curved part 7a in the middle of its length, and has straight parts 7b for welding at both ends, so that the joint plate 7 has an S-shaped layered curved part 7a in the middle of its length, and has straight parts 7b for welding at both ends, so that there is The two ends of the fin 4 are interposed and the tips of the fins 4 are welded to each other.

Note that the S-shaped layer bending portion γa can be further bent by thermal contraction force that narrows the distance between the evaporation tubes 5 (see FIG. 3).

Reference numeral 8 denotes two first lower headers on the introduction side, each of which is provided with one inlet pipe 9.

Reference numeral 10 denotes two second lower headers on the introduction side, which are connected to the ladder 8 through two horizontal connecting pipes 11, respectively.

Reference numeral 31 denotes a straight joint plate that connects the evaporator tube 12 of the first example and the evaporator tube 13 of the second row in the middle of its length, and both ends thereof are connected to the tips of the fins 4 of the evaporator tube 12. It is welded.

16 is a straight joint plate connecting the evaporation tubes 12 of the first example and the evaporation tubes 13 of the second row in the same manner as described above at the midpoint of their lengths; 17 is the evaporation tube 13 of the second row and the evaporation tubes 13 of the second row; A central connecting plate connects each evaporator tube 5 in the left end row of the corresponding frame-fixed evaporator tube group 1 at the middle of its length in the same way as described above, and the front and rear end ones are straight, and the inner side Objects are bent into shapes when viewed from a flat surface.

Reference numeral 18 denotes an upper joint plate that connects the second row of evaporator tubes 13 and the corresponding evaporator tubes 5 at their upper ends in the same manner as described above, and its shape is the same as that of the central joint plate 11.

The lower ends of the first and second rows of evaporation tubes 12 and 13 are therefore not connected to other evaporation tubes.

19.20 is a first upper header and a second upper header corresponding to the first and second lower headers 8, 10, which are connected to the first and second rows of evaporation pipes 12.20 through vertical connecting pipes 21.22. It is connected to 13.

A horizontal connecting pipe 23 connects the first upper header 19 and the ladder 20 to the second upper part, and corresponds to the horizontal connecting pipe 11.

24 is an inverted connecting pipe connecting the ladder 20 and the upper end of each evaporator tube 5 in the left end row of the frame-fixed evaporator tube group 1 to the second upper part;
Reference numeral 25 denotes a discharge side header equipped with an outlet pipe 26, which consists of two left and right pipes and a connecting pipe connecting them. They are connected by a vertical connecting pipe 27.

28 is a support leg on the side of frame-fixed evaporator tube group 1; 29 is a support leg on the side of evaporator tubes 12.13 of frame-separated evaporator tube group 32; It is installed.

In the above, liquid oxygen at a low temperature of -1800 ci is introduced from the inlet pipe 9 to the first and second lower headers 8, 1 on the introduction side.
evaporation tubes 12 of the frame separation evaporation tube group 32.
．． 13 first and the first and second headers 19.20
It flows through a meandering passage including the evaporator tubes 5 of the fixed frame evaporator tube group 1 to reach the discharge side header 25, and its outlet tube 2
As stated at the beginning, the liquid oxygen is roughly divided into three regions: the boiling region, the gas low temperature region, and the gas high temperature region.

The first and second rows of evaporator tubes 12 and 13 correspond to the boiling parts of these regions.

The number of rows of evaporator tubes to be separated from the frame-fixed evaporator tube group 1 is determined according to this boiling class region.

Therefore, the number of rows is not limited to two as in this embodiment, but there may be one row, or there may be three or more rows.

[Brief explanation of drawings]

Figure 1 is a plan view of an evaporator that is an embodiment of this invention;
The figure is the same side view, and FIG. 3 is an enlarged plan view showing a state in which opposing fins of adjacent evaporation tubes are connected by a connecting plate. 1... Frame fixed evaporation tube group, 2, 3... Frame, 4... Fin, 5.12.13...
Evaporation pipe, 6...U-shaped connecting pipe, 32...
Frame separation evaporator tube group.

Claims (1)

[Scope of utility model registration request] A large number of vertical evaporation tubes 5 are arranged at predetermined intervals in the longitudinal and lateral directions and are connected at their upper and lower ends via connecting plates 7, and the evaporator tubes 5 that are adjacent to each other on the left and right sides are successively connected vertically and alternately. A rectangular upper and lower frame 2° 3 that surrounds and fixes the upper and lower ends of the U-shaped connecting pipe 6 and the interconnected evaporation pipes 5 that collectively form a meandering passage in the left-right direction. a group of fixed frame evaporation tubes 1, and a plurality of rows of vertical evaporation tubes 12.1 arranged in the front-rear direction and communicating with each of the meandering passages thereof and serving as a boiling region of liquid oxygen.
3 is a multi-tube liquid oxygen evaporator consisting of a group of frame-separated evaporation tubes 32 connected to other evaporation tubes 12 and 13 at a portion other than the lower end.