JP2545324Y2 - Plate fin heat exchanger - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate fin heat exchanger.

[0002]

2. Description of the Related Art FIGS. 2 to 4 show examples of the structure of a conventional plate fin heat exchanger. In the figure, reference numeral 1 denotes a casing, reference numeral 1a denotes a casing side plate, reference numeral 2 denotes a separator, reference numeral 3 denotes a corrugated fin, reference numeral 4 denotes a heat exchange flow path, reference numeral 4a denotes a high-temperature flow path, reference numeral 4b denotes a low-temperature flow path, and reference numeral. 5 is a header.

As shown in FIG. 4, this plate fin heat exchanger has two casing side plates 1 arranged in parallel.
A heat exchange flow path 4 including a high-temperature flow path 4a and a low-temperature flow path 4b in a laminated state is provided between the heat exchange flow paths 4a and 4a. The heat exchange channel 4 is
The plurality of separators 2 and the plurality of corrugated fins 3 are formed by alternately overlapping each other. And the high temperature channel 4
The headers 5 serving as the inlet and outlet of the fluid are arranged in each of the a and the low-temperature channel 4b while the respective channels are assembled.

As shown in FIGS. 2 and 3, the header 5 has a tank-shaped header housing 5a disposed at four corners of the casing 1 so as to penetrate the casing side plate 1a and the heat exchange flow path 4 in the laminating direction. It is composed. As shown in FIG. 4, the header housing 5a is connected to the two casing side plates 1a by being welded to the two casing side plates 1a, respectively, to increase the strength of the casing 1 in the stacking direction of the heat exchange flow path 4. Functions as a reinforcing member. A plurality of slits 5b are provided on the side surface of the header housing 5a located between the casing side plates 1a so that the inside and the outside of the header 5 can communicate with each other. The fluid is circulated through the fluid.

On the other hand, in the heat exchange flow path 4 near the header 5, the end C of the heat exchange flow path 4 which does not correspond to the header 5.
Is closed. That is, near the header 5, which is the inlet / outlet of the fluid to the high-temperature channel 4a, the end C of the low-temperature channel 4b is closed, and near the other header 5, the end C of the high-temperature channel 4a is closed. You. As a result, the high temperature flow path 4a and the low temperature flow path 4b are separated from each other so that the fluid flowing therethrough does not leak to the flow path on the other side. This closing process is performed, for example, by joining separators 2 that separate different flow paths by a method such as welding.

In the plate fin heat exchanger configured as described above, the fluid flowing from the header 5 is passed through each heat exchange flow path 4. That is, heat is exchanged between the two fluids by inserting the high-temperature fluid as indicated by the solid arrow in FIG. 3 and the low-temperature fluid as indicated by the dashed arrow in FIG. And
At the time of the heat exchange, the heat exchange efficiency is increased by increasing the contact area between the corrugated fins 3 and the fluid in the heat exchange flow path 4, thereby enabling downsizing.
Furthermore, since the heat exchange efficiency is high compared to other general heat exchangers, for example, it is considered that the first fluid is suitable for heat exchange when the first fluid is a gas in a high temperature state or the like. .

[0007]

By the way, in this plate fin heat exchanger, heat exchange is performed by passing the high-temperature fluid and the low-temperature fluid through the heat exchange flow path 4 which is separated in a stacked state as described above. Therefore, it is necessary to check the soundness of the end portion C of the heat exchange flow path 4 separating the two fluids periodically or as necessary.

However, since the plate fin heat exchanger is constructed by welding the header housing 5a to the casing side plate 1a, the terminal C of the heat exchange flow path 4 is connected to the header housing 5a after welding. And only slightly visible through the slit 5b on the side of the header housing 5a. Therefore, it is difficult to confirm the soundness of the end portion C, and even if a defect is found through the slit 5b, it is difficult to repair the defective portion.

[0009] The present invention has been made in view of the above-described circumstances, and has a function as a reinforcing member with a header.
It is an object of the present invention to provide a plate fin heat exchanger capable of confirming the soundness inside a heat exchanger around a header.

[0010]

In order to achieve the above-mentioned object, the present invention provides a plurality of heat-generating plates which are laminated by a separator and a corrugated fin between two casing side plates arranged in parallel. An exchange channel and a header for assembling the heat exchange channel are provided, and the header is provided with a header housing fixed to the two casing side plates and an inner cylinder screwed to the header housing. And a plate-fin heat exchanger having a structure in which a through-hole through which a fluid flows is provided in the inner cylinder.

[0011]

According to the plate fin heat exchanger of the present invention, the fluid entering the header flows through the through-hole of the inner cylinder and is diverted to the heat exchange flow path in a stacked state. Heat exchange is performed. And the fluid that has passed through the heat exchange flow path
It merges at another header and is discharged outside. The inner cylinder is screwed to the header housing attached to the two casing side plates, so that both casing side plates are connected to function as a casing reinforcing member. Then, at the time of maintenance, by removing the inner cylinder, the inside of the heat exchanger can be visually checked.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the plate fin heat exchanger according to the present invention will be described below with reference to FIG. In this embodiment, the same reference numerals are given to portions having the same configuration as the conventional plate fin heat exchanger shown in FIGS.
Simplify the description.

In FIG. 1, reference numeral 21 denotes a header, and reference numeral 2 denotes a header.
1a is a header housing, 22 is an inner cylinder, 22b
Is a slit (through hole), numeral 23 is a plenum portion, and numeral 24 is
Is a flange, 25 is an opening, 26 is a blind plate, C is a distal end, and G is an external conduit.

The plate fin heat exchanger of the present embodiment
This is common to the conventional example in that the heat exchange flow path 4 including the high-temperature flow path 4a and the low-temperature flow path 4b is formed in a stacked state between the casing side plates 1a. However, this is different from the prior art example in that a header 21 in which an inner cylinder 22 is screwed is provided in a header housing 21a instead of the header 5 composed of the tank-shaped header housing 5a.

The header housing 21a is connected to the heat exchange passage 4
23 formed so as to penetrate through in the stacking direction
A ring-shaped member disposed in a state penetrating the two casing side plates 1a, and the internal thread 21
b, and is fixed by welding to the casing side plate 1a. The header housing 2
1a, a flange 24 for connecting the external pipeline G, and an opening 25 through which fluid flows between the external pipeline G
And a blind plate 26 for closing the header 21 is provided on the other side.
Are welded.

In the inner cylinder 22, a male screw 22a is formed on the outer peripheral surface of the cylinder so as to be screwed with the female screw 21b of the header housing 21a, and slits 22b along the longitudinal direction are provided at intervals in the circumferential direction. Is formed. The slit 22b is formed at a position where the inner cylinder 22 is disposed between the two casing side plates 1a in a state where the inner cylinder 22 is disposed in the header, and is shorter than the interval between the casing side plates 1a.

The inner cylinder 22 is connected to the header housing 2.
1a, the two casing side plates 1a
Are connected to form a plate fin heat exchanger.

According to this plate fin heat exchanger, the fluid that has flowed into the header 21 from the external conduit G flows into the heat exchange flow path 4 through the through-hole 22 b provided in the inner cylinder 22. Then, while the heat exchange flow path (for example, the high-temperature flow path 4a) is inserted, heat exchange is similarly performed with a fluid that is inserted in another heat exchange flow path (for example, the low-temperature flow path 4b). . At this time, since the casing side plate 1a of the plate fin heat exchanger is connected by the inner tube 22, the plate fin heat exchanger is reinforced in the direction in which the stacked heat exchange flow paths 4 are separated, and the pressure of the internal fluid and the like are increased. Withstand pressure can be increased.

On the other hand, in order to check the soundness of the inside of the plate fin heat exchanger or to maintain a defect, the external conduit G attached to the flange 24 of the header housing 21a is removed and the inside of the header 21 is removed. The inner cylinder 22 is rotated in a direction to remove the screw engagement with the header housing 21a to take out the inner cylinder 22 from the header 21.
Thus, the inside of the plate fin heat exchanger can be observed from the opening 25 of the header housing 21a.

<Other Embodiments> In the plate fin heat exchanger according to the present invention, the following techniques can be adopted. In place of the slit 22 b provided in the inner cylinder 22, a plurality of pores are provided. The external thread 22a on the outer peripheral surface of the inner cylinder 22 is formed only in a screwed portion with the header housing 21a, and the other part is formed into a cylinder having an outer diameter smaller than the diameter of the valley of the external thread 22a.

[0021]

As described above, according to the plate fin heat exchanger according to the present invention, the stacked heat exchange flow path and the header for assembling the heat exchange flow path between the casing side plates in the parallel state. And the inner cylinder for connecting the two casing side plates to the header is detachably provided, so that the following effects can be obtained. (1) The inner cylinder receives the pressure of the internal fluid applied in the stacking direction of the heat exchange flow passage, and reinforces the heat exchanger, thereby improving the durability and the earthquake resistance of the heat exchanger. (2) By removing the inner cylinder inside the header at the time of periodic inspection or as necessary, the soundness inside the heat exchanger can be visually checked, and early detection of trouble and improvement of maintainability can be achieved. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a plate fin heat exchanger according to the present invention.

FIG. 2 is a front sectional view showing a conventional example of a plate fin heat exchanger.

FIG. 3 is a plan view of the plate fin heat exchanger of FIG. 2;

FIG. 4 is an enlarged sectional view showing a portion indicated by a chain line A in FIG. 2;

[Explanation of symbols]

 Reference Signs List 1 casing 1a casing side plate 2 separator 3 corrugated fin 4 heat exchange channel 4a high temperature channel 4b low temperature channel 5.21 header 5a.21a header housing 21b female screw 22 inner cylinder 22a male screw 22b slit (through hole) 23 Plenum 24 Flange 25 Opening 26 Blind plate C Terminal end G External pipeline

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of heat exchange channels, which are stacked by a separator and corrugated fins, and a header for assembling the heat exchange channels are provided between two casing side plates arranged in parallel. In addition, the header comprises a header housing fixed to the two casing side plates and an inner cylinder screwed to the header housing, and a fluid through which the fluid flows through the inner cylinder. A plate fin heat exchanger characterized by having holes.