JPH0590176U - Plate fin heat exchanger - Google Patents

Abstract

(57) [Abstract] [Purpose] The plate fin heat exchanger is designed to improve the workability during inspection and repair by making the inside of the header visible. [Structure] Between the casing side plates in a parallel state, a heat exchange passage in a laminated state and a header for collecting the heat exchange passages are arranged. The header is composed of a header housing attached to both casing side plates and an inner cylinder arranged in a screwed state with the header housing. The inner cylinder connects the casing side plates and removes the inner cylinder for maintenance. Make the inside of the heat exchanger visible.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a plate fin heat exchanger.

[0002]

[Prior Art]

 2 to 4 show a structure example of a conventional plate fin heat exchanger. In the figure, reference numeral 1 is a casing, reference numeral 1a is a casing side plate, reference numeral 2 is a separator, reference numeral 3 is a corrugated fin, reference numeral 4 is a heat exchange passage, reference numeral 4a is a high temperature passage, and reference numeral 4b is a low temperature passage. , Reference numeral 5 is a header.

As shown in FIG. 4, this plate fin heat exchanger has a heat exchange consisting of a high temperature flow path 4a and a low temperature flow path 4b in a stacked state between two casing side plates 1a arranged in parallel. It has a flow path 4. The heat exchange flow path 4 is formed by alternately stacking a plurality of separators 2 and a plurality of corrugated fins 3. Then, the high-temperature flow passage 4a and the low-temperature flow passage 4b are provided with headers 5 that serve as inlets and outlets for the fluid, while assembling the respective flow passages.

As shown in FIGS. 2 and 3, the header 5 is provided at four corners of the casing 1 with a tank-shaped header housing 5 a penetrating the casing side plate 1 a and the heat exchange passage 4 in the stacking direction. Arranged and configured. As shown in FIG. 4, the header housing 5a is welded to the two casing side plates 1a to connect the two casing side plates 1a to each other, and the strength of the casing 1 in the stacking direction of the heat exchange passages 4 is strengthened. Functions as a member that reinforces. In addition, a plurality of slits 5b for establishing communication between the inside and outside of the header 5 are provided on the side surface of the header housing 5a located between the casing side plates 1a, and the header 5 and the heat exchange passage 4 are connected through the slits 5b. Fluid is distributed between them.

On the other hand, in the heat exchange passage 4 near the header 5, the end portion C of the heat exchange passage 4 that does not correspond to the header 5 is closed. That is, the end portion C of the low temperature passage 4b is closed in the vicinity of the header 5 which is the inlet / outlet of the fluid to the high temperature passage 4a, and the end portion C of the high temperature passage 4a is closed in the vicinity of the other header 5. Is blocked. As a result, the high temperature flow path 4a and the low temperature flow path 4b are separated so that the fluids flowing through the high temperature flow path 4a and the low temperature flow path 4b do not leak to the flow paths on the other side. This closing process is performed, for example, by joining the separator plates 2 that separate different flow paths by a method such as welding.

In the plate fin heat exchanger thus configured, the fluid flowing from the header 5 is inserted into each heat exchange flow path 4. That is, heat is exchanged between the two fluids by inserting the hot fluid as shown by the solid arrow in FIG. 3 and the cold fluid as shown by the dashed arrow in FIG. At the time of heat exchange, the contact area between the corrugated fins 3 and the fluid is increased in the heat exchange flow path 4, thereby increasing the heat exchange efficiency and enabling downsizing. Furthermore, since it has a higher heat exchange efficiency than other general heat exchangers, it is considered suitable for heat exchange, for example, when the first fluid is a gas in a high temperature state. ..

[0007]

[Problems to be solved by the device]

 By the way, in this plate fin heat exchanger, as described above, the high temperature fluid and the low temperature fluid are inserted into the heat exchange flow paths 4 separated in the laminated state to perform heat exchange, so that the two fluids are separated. It is necessary to check the soundness of the end portion C of the heat exchange channel 4 regularly or as needed.

However, since this plate fin heat exchanger is constructed by welding the header housing 5a to the casing side plate 1a, after the welding, the end portion C of the heat exchange flow passage 4 described above is welded to the header housing. It is blocked by 5a and can only be seen slightly 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 part. It was

The present invention has been made in view of the above-mentioned circumstances, and is a plate fin heat exchange that enables confirmation of the soundness inside the heat exchanger around the header while allowing the header to function as a reinforcing member. The purpose is to provide a container.

[0010]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a plurality of heat exchange passages and a plurality of heat exchange passages that are stacked by a separator and corrugated fins between two casing side plates arranged in parallel. And a header housing that is fixed to the two casing side plates and an inner cylinder that is screwed into the header housing. (EN) A plate fin heat exchanger having a structure in which a through hole for allowing fluid to flow is provided in a cylinder.

[0011]

[Action]

 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 divided into the heat exchange passages in the stacked state, and the heat exchange is performed while the heat exchange passage is inserted. Exchange is performed. Then, the fluids that have passed through the heat exchange passage are merged in another header and discharged to the outside. Since the inner cylinder is screwed to the header housings attached to the two casing side plates, both casing side plates are connected to function as a reinforcing member for the casing. Then, during maintenance, it is possible to visually check the inside of the heat exchanger by removing the inner cylinder.

[0012]

【Example】

 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 the portions having the same configuration as the conventional plate fin heat exchanger shown in FIGS. 2 to 4, and the description will be simplified.

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

In the plate fin heat exchanger of the present embodiment, the heat exchange passage 4 including the high temperature passage 4a and the low temperature passage 4b is formed in a laminated state between the two casing side plates 1a. Is common with the conventional example. However, this is different from the prior art example in that the header 5 including the tank-shaped header housing 5a is replaced with a header 21 having a header housing 21a and an inner cylinder 22 arranged in a screwed state.

The header housing 21a is a ring-shaped member in which two casing side plates 1a are respectively arranged in a penetrating state in a plenum portion 23 formed so as to penetrate the heat exchange passage 4 in the stacking direction, The inner peripheral surface thereof has a female screw 21b, which is fixed by being welded to the casing side plate 1a. One of the header housings 21a is provided with a flange 24 for connecting the external conduit G, and an opening 25 for allowing fluid to flow between the header housing 21a, and the header 21 is closed on the other. The blind plate 26 is welded.

The inner cylinder 22 is formed with a male screw 22a that is screwed onto the female screw 21b of the header housing 21a on the outer peripheral surface of the cylinder, and slits 22b along the longitudinal direction are circumferentially spaced. Has been formed. The slit 22b is formed at a position where it is arranged between the two casing side plates 1a in a state where the inner cylinder 22 is arranged in the header, and is shorter than the space dimension of the casing side plate 1a.

By screwing the inner cylinder 22 into the header housing 21a, 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 outer pipe line G passes through the through hole 22 b provided in the inner cylinder 22 and flows into the heat exchange flow path 4. Then, while the heat exchange flow passage (for example, the high temperature flow passage 4a) is being inserted, heat exchange is similarly performed with the fluid that is inserted through another heat exchange flow passage (for example, the low temperature flow passage 4b). It At this time, in the plate fin heat exchanger, since the casing side plates 1a are connected by the inner cylinder 22, the heat exchange passages 4 in the stacked state are reinforced in the separation direction, and the internal fluid The pressure resistance against pressure and the like can be enhanced.

On the other hand, when inspecting the internal soundness of this plate fin heat exchanger or maintaining a defect, the external conduit G attached to the flange 24 of the header housing 21a is removed, and the header 21 is removed. The inner cylinder 22 inside is rotated in the direction to remove the screwing with the header housing 21 a, and the inner cylinder 22 is taken out from the inside of the header 21. This allows the inside of the plate fin heat exchanger to be observed through the opening 25 of the header housing 21a.

<Other Embodiments> The plate fin heat exchanger according to the present invention may employ the following techniques. Instead of the slits 22b provided in the inner cylinder 22, a plurality of pores should be provided. The male screw 22a on the outer peripheral surface of the inner cylinder 22 should be formed only at the screwing portion with the header housing 21a, and the other portion should be formed as a cylinder having an outer diameter smaller than the diameter of the valley of the male screw 22a.

[0021]

[Effect of the device]

 As described above, according to the plate fin heat exchanger according to the present invention, the heat exchange passages in the stacked state and the header for assembling the heat exchange passages are arranged between the casing side plates in the parallel state. Since the inner cylinder for connecting both casing side plates to the header is detachably arranged, the following effects are obtained. (1) Since the inner cylinder receives the pressure of the internal fluid applied in the stacking direction of the heat exchange passages and reinforces the heat exchanger, the durability and earthquake resistance of the heat exchanger are improved. (2) By removing the inner cylinder inside the header at the time of periodic inspection or when necessary, the soundness inside the heat exchanger can be visually confirmed, which enables early detection of defects and improvement of maintainability. it can.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an 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.

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

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

[Explanation of symbols]

 1 Casing 1a Casing side plate 2 Separation plate 3 Corrugated fins 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 part 24 Flange 25 Opening part 26 Blind plate C Terminal part G External pipeline

Claims (1)

[Scope of utility model registration request] 1. A plurality of heat exchange passages that are stacked by a separator and corrugated fins and a header that collects the heat exchange passages are provided between two casing side plates that are arranged in parallel. At the same time, the header is composed of a header housing fixed to each of the two casing side plates and an inner cylinder arranged in a screwed state with the header housing. A plate fin heat exchanger characterized in that holes are provided.