JPH0732462U - Seal structure in heat exchanger - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a heat exchanger having excellent sealability at a portion where a side plate, which is a tube bundle plate, and an outer cylinder come into contact with each other, and which allows easy insertion of the side plate. [Structure] An inner cylinder is fitted into a side plate provided in a cylindrical outer cylinder, an evaporator of a refrigeration cycle is arranged in the inner cylinder, and a plurality of heat transfer pipes are arranged in a space between the outer cylinder and the inner cylinder. In the heat exchanger as described above, a U-shaped groove is provided on the outer periphery of the side plate, and an endless seal packing having a horseshoe-shaped cross section is fitted into the groove so as to be convex upward. A seal structure and a seal structure in a heat exchanger in which a communication hole communicating with the inner cylinder or the outer cylinder is provided in a groove portion of a side plate into which the seal packing is fitted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, the inner cylinder is fitted and inserted into the side plate provided in the cylindrical outer cylinder, the evaporator of the refrigeration cycle is arranged in the inner cylinder, and the heat transfer pipe is provided in the space between the outer cylinder and the inner cylinder. The present invention relates to an improvement in a seal structure between a side plate and an inner wall of an outer cylinder in a plurality of heat exchangers arranged.

[0002]

[Prior art]

 As a sealing structure of a side plate in a conventional heat exchanger, an O-ring having a circular cross section is fitted in a groove provided on the outer periphery of the side plate to seal the inner surface of the pipe. In addition, recently, after the O-ring was fitted, the seal was made more reliable by crimping from the outside of the outer cylinder.

[0003]

[Problems to be solved by the device]

 However, the O-ring used for the seal has a small elasticity, and its followability with respect to the error with the perfect circle is weak. Further, in order to improve the followability, it is preferable to improve the adhesion to the outer periphery of the side plate and the adhesion to the inner wall of the outer cylinder, and therefore it is necessary to increase the contraction rate of the O-ring or the elastic modulus of the O-ring. There is. As a result, it becomes difficult to fit the O-ring into the groove of the side plate, or it is difficult to insert the side plate into the outer cylinder. In the case of the method of caulking from the outside of the outer cylinder after inserting the side plate, the material and dimensions must be selected so that the caulking takes time and the outer cylinder can be plastically machined easily. There was a problem in selecting. In view of the inconveniences of the prior arts, the present invention has an object to provide a product having a relatively simple structure and excellent sealing property without difficulty in selection of design and material.

[0004]

[Means for Solving the Problems]

 That is, according to the invention of claim 1, the inner cylinder is fitted into the side plate provided in the cylindrical outer cylinder, the evaporator of the refrigeration cycle is arranged in the inner cylinder, and the inner cylinder is transferred to the space between the outer cylinder and the inner cylinder. In a heat exchanger having a plurality of heat pipes arranged, a U-shaped groove is provided on the outer periphery of the side plate, and a seal structure in a heat exchanger in which an endless seal packing having a horseshoe-shaped cross section is fitted into the groove is a seal structure. The invention of item 2 considers the difference between the pressure of the compressed air input to the heat exchanger and the pressure of the discharged dry air, and determines whether the inside of the horseshoe-shaped seal packing is inside the inner cylinder or the outer cylinder (input side). The pressure is made the same through the communication hole provided in the side plate, and the outer side of the seal packing is brought into conduction with the discharge side of the outer cylinder, and is pressed against the wall surface of the outer cylinder due to the pressure difference.

[0005]

[Action]

 Since the seal packing according to the present invention has a horseshoe-shaped cross section and has a smaller cross-sectional area than the conventional O-ring, it can be fitted into the U-shaped groove of the side plate with a relatively small force. Since the seal packing has an arch shape, it is excellent in elasticity and can be smoothly inserted when the inner cylinder is inserted into the outer cylinder together with the side plate. After insertion, since it has elasticity, it follows along the inner wall surface of the outer cylinder to ensure the seal. According to the second aspect of the present invention, the inside of the horseshoe-shaped seal packing is designed to be higher than the outside by utilizing the pressure difference between the input air and the exhaust air generated when the heat exchanger is operated. , The horseshoe-shaped seal packing expands toward the outer cylinder so that the balloon expands, and the adhesion with the inner wall surface becomes stronger.

[0006]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a cross-sectional view of a heat exchanger. Inside a cylindrical outer cylinder 1, side plates 2 and 3 which are two tube bundle plates are attached so as to come into contact with the inner wall surface. The inner cylinder 4 is inserted. Reference numeral 5 is an evaporator mounted in the inner cylinder 4, 6 is a heat transfer pipe fitted into holes formed in the side plates 2 and 3, and a corrugated plate 7 is provided on the outer periphery of the heat transfer pipe 6. It is partitioned by In this embodiment, since the inner cylinder 4 is eccentrically attached to the side plates 2 and 3, the center of the outer cylinder is arranged so that the heat transfer pipes 6 arranged in the space between the inner cylinder 4 and the outer cylinder 1 can be evenly arranged. A partition plate 8 having a semicircular cross section is attached to the shafts at equidistant positions. In addition, 9 is a compressed air inlet and 10 is a dry air outlet. Further, 12 is a drain trap for discharging the drain accumulated below the outer cylinder to the outside.

FIG. 3 is an enlarged cross-sectional view showing a state in which the outer cylinder 1 and the side plate 2 (or 3) are mounted, and the side plate when the side plate 2 is inserted near the compressed air outlet 10 in the outer cylinder 1. A stopper 14 is attached to prevent 2 from entering too much. A shallow U-shaped groove 16 is formed on the outer peripheral surface of the side plate 2, and an endless seal packing 18 having a horseshoe-shaped cross section is fitted into the groove 16. The inner diameter of the leg portion 18a of the seal packing 18 is designed to be smaller than the inner diameter of the outer peripheral groove 16 of the side plate 2. Furthermore, the leg portion 18a of the seal packing 18 is made thicker than the central protruding portion 18b.

Further, the side plate 2 is provided with a communication hole 21 for communicating the U-shaped groove 16, the pre-cooling chamber 20 surrounded by the inner cylinder 4 and the outer cylinder 1, and the other side plate 3 is provided. A communication hole 22 for communicating the groove 16 with the preliminary cooling chamber 20 is provided. Further, the convex portion 23 on the air outlet side forming the groove 16 on the outer peripheral portion of the side plate 2 is formed low so as to provide clearance (0.1 to 0.5 mm) with the inner wall of the outer cylinder 1. The convex portion 24 on the cooling air discharge side that forms the groove 16 on the outer peripheral portion of the side plate 3 is formed low in order to provide a clearance (0.1 to 0.5 mm) with the inner wall of the outer cylinder 1. Further, as shown in FIG. 3, the width of the seal packing 18 is formed to be substantially the same as the width of the groove 16 so that the leg portions 18a come into contact with the inner wall of the convex portion.

In the heat exchanger according to the present embodiment having the above-described configuration, the compressed air (high temperature) that has entered from the air inlet 8 is introduced into the precooling chamber 20 and the cooled air that flows in the heat transfer pipe 6. It is heat-exchanged and pre-cooled, flows into the inner cylinder 4, is dehumidified and cooled by the evaporator 5 of the refrigerating cycle arranged therein, and becomes air having a low absolute humidity. The dehumidified and cooled air further flows through the heat transfer pipe 6 to be heated by heat exchange with the high temperature compressed air flowing around the outer circumference of the heat transfer pipe 6 to be air having a low relative humidity and discharged from the air outlet. At this time, the air around the horseshoe-shaped seal packing 18 becomes the same as the air pressure near the air outlet due to the clearances provided in the convex portions 23 and 24 that form the outer circumferences of the side plates 2 and 3, and the seal packing Since the air pressure inside 18 is in communication with the pre-cooling chamber 20 through the communication hole 22, the air pressure is the same as that of the pre-cooling chamber 20. The pre-cooling chamber 20 is a place where the heated high-temperature compressed air is blown, and the air outlet side is the side from which the dehumidified / cooled air is discharged. Since the packing 18 is pressed toward the inner wall of the outer cylinder 1, the sealability and the followability to the inner wall surface are improved.

Although the communication hole 22 provided in the side plate 2 is configured to communicate with the pre-cooling chamber 20 side in the present embodiment, the invention is not limited to this, and the communication hole 22 may be connected to the inside of the inner cylinder 4. Even if it is configured to communicate with each other, the internal pressure of the seal packing can be increased. Further, in this embodiment, the projections 23 and 24 on one of the side plates 2 and 3 are configured to have a clearance with the inner wall of the outer cylinder 1. However, since the inside and outside of the horseshoe-shaped seal packing are sealed to this, The clearance may be provided on both convex portions of the groove 16.

Further, by appropriately providing the ventilation holes 26 on the side surface portion of the corrugated plate 7, the air flowing in from the air inlet can be efficiently exchanged with the cooling air flowing in the heat transfer pipe 6 many times. It can be pre-cooled.

[0012]

【effect】

 As described above, the structure of the seal packing of the side plate in the heat exchanger according to the present invention is more elastic than that using the conventional O-ring, and therefore has good followability to the inner wall surface of the outer cylinder. , It is not necessary to crimp from the outside as in the past. In addition, since the horseshoe-shaped seal packing has excellent elasticity, there is little resistance when inserting the side plate into the outer cylinder with the inner cylinder inserted in the heat exchanger assembly work. Also excellent in sex. Further, in the case where the side plate is provided with the communication hole, the internal pressure of the seal packing is increased by operating the heat exchanger, and the sealing property is more excellent.

[Brief description of drawings]

1 is a longitudinal sectional view of an apparatus according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line AA of the device of FIG.

FIG. 3 is an enlarged sectional view showing a connection relationship between a side plate and an outer cylinder.

[Explanation of symbols]

 1 Outer Cylinder 2, 3 Side Plate 4 Inner Cylinder 5 Evaporator 6 Heat Transfer Pipe 7 Corrugated Plate 8 Partition Plate 9 Compressed Air Inlet 10 Air Outlet 12 Drain Trap 14 Stopper 16 Groove 18 Seal Packing 20 Pre-cooling Chamber 22 Communication Hole 23, 24 Projection 26 Vent hole

[Procedure amendment]

[Submission date] March 29, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 4

[Correction method] Added

[Correction content]

FIG. 4 is a partial enlarged cross-sectional view showing a joint relationship between a seal packing and an outer cylinder.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroaki Matsumoto, 246, Kouji, Ozaka, Suzaka, Nagano Prefecture, Orion Machinery Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. An inner cylinder is fitted and inserted into a side plate provided in a cylindrical outer cylinder, an evaporator of a refrigeration cycle is arranged in the inner cylinder, and a heat transfer pipe is provided in a space between the outer cylinder and the inner cylinder. In a plurality of heat exchangers, a U-shaped groove is provided on the outer periphery of the side plate, and an endless seal packing having a horseshoe-shaped cross section is fitted into the groove so as to be convex upward. Structure in the container. 2. The seal structure for a heat exchanger according to claim 1, wherein a communication hole communicating with the inner cylinder or the outer cylinder is provided in a groove portion of the side plate into which the seal packing is fitted. 3. The seal structure for a heat exchanger according to claim 1, wherein the leg portion of the horseshoe-shaped seal packing is thicker than the center portion thereof.