JP2516156B2 - Inner / outer shell structure in heat exchanger of compressed air dehumidifier and its molding method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure and a molding method for the inner and outer shells of a heat exchanger in a compressor dehumidifier, which is simpler than conventional structures and easy to assemble and has high thermal efficiency. Is provided.

[0002]

2. Description of the Related Art As a conventional heat exchanger of this type, as shown in FIG. 5, one end of a metal inner shell 1 forming a dehumidifying passage 2 is fixed to an annular tube bundle plate 4 and the other end is circular. It is closed by a plate-shaped tube bundle plate 3, and the outer peripheral surfaces of the tube bundle plates 3 and 4 are welded and fixed to the inner peripheral surface of the outer body 5, so that the tube bundle plates 3 and 4 are closed between the inner and outer body bodies 1 and 5. Forming a precooling passage 6 and forming an outer shell 5
Both end parts of the dehumidifying passage 2 are fixed by welding with end plates 7 and 8, and the one end plate 7 and the annular tube bundle plate 3 and one end part of the outer case 5 are used for the dehumidification passage 2
It is known that the open end side is closed and a collecting chamber 9 is formed between the other end plate 8 and the disc-shaped tube bundle plate 4 (Japanese Utility Model Publication No. 57-59820). In such a conventional structure, the tube bundle plate and the outer cylinder are fixed by welding.

[0003]

However, the structure of such a conventional heat exchanger has a difficulty in working and a large number of working steps because the tube bundle plate is fixed to the inner wall of the outer case by welding or the like. It took time to create. Further, since the inner case is made of metal or the like, the cooling energy of the evaporator mounted inside the inner case leaks to the outside through the inner case, resulting in poor energy efficiency. Further, since the inner cylinder is sealed by the disc-shaped tube bundle plate, the refrigerant pipe of the evaporator must be bent inside the inner cylinder, and it is necessary to limit the number of baffle fins attached to the refrigerant pipe. It was Since the heat transfer tube attached to the annular tube bundle plate is configured to slightly project from the tube bundle plate, the drainage generated in the evaporator may pass through the tube bundle plate by the force of the wind and enter the heat transfer tube. It was Therefore, the present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object thereof is to provide a structure and a manufacturing method in which a heat exchanger is easily manufactured, heat exchange efficiency is high, and a drain is less likely to enter a heat transfer tube. And

[0004]

That is, according to the present invention, an inner cylinder is arranged at a predetermined interval in a cylindrical outer cylinder, and an evaporator of a refrigerating cycle is provided in the inner cylinder and an outer cylinder and an inner cylinder. In a heat exchanger in which a heat transfer tube is arranged in a gap between the inner cylinder arranged inside the outer cylinder, a cylindrical tube bundle plate with a bottom and a ring-shaped tube bundle plate having a seal material attached to the outer peripheral surface is chlorinated. A pipe member made of a synthetic resin such as vinyl is inserted and a heat exchanger of a compressed air dehumidifying device having a heat transfer tube attached to the outer peripheral portion of the tube bundle plate, and an inner and outer shell structure and an end plate at one end of a cylindrical outer shell. Welding process, and a pipe material made of synthetic resin such as vinyl chloride is inserted into the tubular tube bundle plate with a bottom and a ring-shaped tube bundle plate that has a sealing material on the outer peripheral surface, and one is fixed to the pipe bundle plate with an adhesive. And the pipe after inserting the heat transfer tube into the circular hole provided near the outer periphery of the tube bundle plate. The process of diameter fixing and inserting the inner shell into the outer shell until the top of the bottomed tubular tube bundle plate contacts the end plate, and caulking the outer shell from above the sealing material provided on the outer periphery of the tube bundle plate, The purpose of the present invention is to fix the shell, the step of inserting the evaporator of the refrigeration cycle into the inner shell and fixing it, and the method of manufacturing the heat exchanger by the step of sealing the other outer shell by welding with the end plate. To achieve. In consideration of the case where the inner shell is made of synthetic resin, etc., the difference in the coefficient of thermal expansion between the inner shell and the material of the outer shell may occur. The other was made only by fitting pipe materials. Further, the heat transfer tube mounted on the outer periphery of the annular tube bundle plate is projected toward the end plate of the outer case so that the drain does not enter the heat transfer tube.

[0005]

In the device according to the present invention, the outer shell can be caulked from above the seal attached to the outer periphery of the tube bundle plate by inserting the bottomed tubular tube bundle plate to the position where it comes into contact with the end plate of the outer shell. By the caulking work, the inner case can be fixed without welding. Since it is a tube bundle plate having a bottomed cylindrical shape, the refrigerant pipe can be extended to the end plate side from the inner body side surface peripheral edge, and as a result, a large number of baffle fins can be attached to the refrigerant pipe. Further, since the heat transfer tube mounted on the outer periphery of the annular tube bundle plate is projected in the end plate direction, it is possible to prevent the drain from flowing along the annular tube bundle plate and flowing into the heat transfer tube. The bottomed tubular tube bundle plate may be formed in a bowl shape having a protrusion at the apex.

[0006]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a partially broken cross-sectional view of a compressed air dehumidifying device according to the present invention, as seen through the inside, wherein 10 is a cylindrical outer cylinder made of stainless steel having a compressed air inlet 11 and an air outlet 12. Inside the body 10, an inner body 14 is installed so as to be substantially concentric. In this embodiment, the inner body 14 is made of a synthetic resin material such as vinyl chloride and has a thickness of about 3 mm. The inner body 14 made of the pipe material is bowl-shaped and has a plurality of holes for fitting the heat transfer tubes in the outer peripheral portion. Opened bottomed tubular tube bundle plate
16 and a tube bundle plate 17 which is annular and has a plurality of holes for fitting the heat transfer tubes in the outer peripheral portion, and is joined to one tube bundle plate with an adhesive made of epoxy resin or the like. These tube bundles 1
In the present embodiment, 6 and 17 are made of aluminum alloy by casting, and a seal material 18 having a width of about 7 mm is attached to the recess formed on the outer peripheral surface of the pipe bundle plate 16.
The projection 20 is projected in the radial direction at the apex of the, and the horizontal distance from the tip of the projection 20 to the sealing material of the tube bundle plate 16 is
It is designed so as to be at the same position as the caulking position from the inner wall of the end plate 22 that seals the outer case 10 toward the tube bundle plate 16 of the outer case 10.

In this embodiment, the heat transfer tube 24 is fitted between the tube bundle plates 16 and 17 on the outer peripheral surface of the upper portion of the inner case 14, and the outer circumference of the heat transfer tube 24 is as shown in FIGS. 2 and 3. The corrugated plate 26 is mounted so that the heat transfer tube 24 is inserted into the convex portion of the corrugated plate 26 and the concave portion of the corrugated plate is located directly below the air inlet 11.
As shown in (3), an air passage hole 28 is opened in the side surface of the convex portion, and the air that has entered from the air inlet 11 is configured to exchange heat with the heat transfer tube 24 in the form of a counter flow. Further, a communication port 30 for communicating with the inside is opened below the tube bundle plate 16 side of the inner case 14. Further, the heat transfer tubes 24 fitted into the tube bundle plates 16 and 17 are made to project considerably from the tube bundle plate 17 toward the end plate 23 at the air inlet side of the heat transfer tubes 24.

An evaporator of a refrigeration cycle consisting of a refrigerant pipe 32 and a baffle fin 34 attached to the refrigerant pipe 32 is mounted in the inner case 14, but in this embodiment, the tube bundle plate 16 is formed in a bowl shape. Therefore, since the refrigerant pipe 32 is bent near the end plate 22, the straight portion of the refrigerant pipe 32 extends, and the baffle fins 34 are attached more than in the conventional case.

In the structure described above, the heat exchanger having the structure according to the present invention may be manufactured by the following procedure. a. An end plate 22 is welded to one end of a cylindrical stainless outer body 10. b. An inner shell 14 made of a pipe material made of a synthetic resin such as vinyl chloride is fitted into a bowl-shaped tube bundle plate 16 having a sealing material 18 on the outer peripheral surface and an annular tube bundle plate 17, and one of them is made of an adhesive made of an epoxy resin. Secure to the tube bundle plate. c. The heat transfer tubes 24 are placed in the circular holes near the outer circumference of the tube bundle plates 16 and 17.
Is inserted so that the air inlet side thereof protrudes to some extent, and then the heat transfer tube 24 is expanded and fixed. d. After the inner body 14 is completed, the inner body 14 is replaced with a bowl-shaped tube bundle plate.
The convex portion 16 contacts the end plate 22 of the outer case 10 and is inserted until a metallic sound is heard, and the outer case 10 is caulked from above the sealing material 18 provided on the outer peripheries of the tube bundle plates 16 and 17 to fix the inner and outer cases. . e. The evaporator of the refrigeration cycle is inserted in the inner case 14 and fixed. f. The other outer case 10 is sealed by welding by the end plate 23. Therefore, this manufacturing operation requires a relatively simple outer shell 10 and end plate 2.
Although the welding process with 2 and 23 is necessary, the welding of the tube bundle plates 16 and 17 and the outer cylinder 10 which has been difficult in the conventional work is not necessary, and the tip end of the bowl-shaped tube bundle plate 16 contacts the end plate 22. Depending on the position, the caulking position can be easily positioned.

In the heat exchanger having the structure according to this embodiment described above, the compressed air introduced from the air inlet 11 is corrugated plate 26.
Flow through the concave part of the corrugated plate 26
Through the corrugated plate 26 on both sides through the heat transfer tube 24
It is pre-cooled by exchanging heat with the cooling air flowing inside. (At this time, the cooling air flowing in the heat transfer tube 24 and the air flowing in the outer periphery thereof are opposite flows.) Next, the air abutting the tube bundle plate 17 is again corrugated through the passage hole 28 formed in the corrugated plate 26. Flows into the concave portion of the corrugated plate 16 and flows into the convex portion through the passage hole 28 of the corrugated plate 26 to form a flow in the direction of the circular plate bundle plate 17 to exchange heat with the cooling air flowing in the heat transfer tubes 24. The compressed air precooled as described above enters the inner shell 14 through the corrugated plate concave portion and the communication hole 30 located below the inner shell 14 through the air passage hole 28, and enters the inner shell 14 inside. It is cooled and dehumidified by exchanging heat with the attached evaporator. The dehumidified and cooled air flows toward the end plate 23 and enters the heat transfer tubes 24 protruding from the tube bundle plate 17. The dehumidified and cooled air flowing through the heat transfer tube 24 is heat-exchanged with the high-heat air flowing around the heat transfer tube 24 to be warmed, and is further discharged from the air outlet 12 as air having a low relative humidity.

In this embodiment, a part of the tube bundle plate 16 is formed in a bowl shape, but is not limited to this, and may be formed in a bottomed cylindrical shape smaller than the inner diameter of the outer case, An annular shape may be used, and the tip of the pipe material may be brought into contact with the end plate 22. Further, regarding the fitting and insertion of the tube bundle plates 16 and 17 and the pipe material constituting the inner case 14, one is adhered and the other is not adhered.
It is for cushioning the shift due to the difference in the coefficient of thermal expansion depending on the material of the outer case 10 and the outer body, and the fitting part is preferably 1 cm.
It is preferable to take the above.

[0012]

As described above, the structure of the heat exchanger and the method for manufacturing the same according to the present invention have fewer welding steps than the conventional ones, and can be easily manufactured and manufactured. Also, unlike the conventional metal, the inner body is made of synthetic resin, so
Loss of cooling energy in the inner case is small, and the weight can be further reduced. Further, in the case where the tube bundle plate is configured in a bowl shape, the refrigerant pipes of the evaporator and the baffle fins mounted inside can be installed on the end plate side more than in the past, so that the heat exchange efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a partially transparent sectional view of an embodiment according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of a corrugated plate that covers a heat transfer ring.

FIG. 4 is a partial cross-sectional view showing how the evaporators of the heat exchangers of the related art and this embodiment are installed.

FIG. 5 is a vertical cross-sectional view of a device showing a conventional technique.

[Explanation of symbols]

 1,14 Inner body 2 Dehumidification passage 3,4 Tube bundle plate 5,10 Outer body 6 Pre-cooling passage 7,8,22,23 End plate 9 Collection chamber 11 Air inlet 12 Air outlet 16,17 Tube bundle plate 18 Sealing material 20 Convex part 24 Heat transfer pipe 26 Corrugated plate 28 Air passage hole 30 Communication port 32 Refrigerant pipe 34 Baffle fin

Claims (5)

(57) [Claims] 1. An inner cylinder is arranged at a predetermined interval in a cylindrical outer cylinder, and an evaporator of a refrigeration cycle is arranged in the inner cylinder, and a heat transfer pipe is arranged in a gap between the outer cylinder and the inner cylinder. In the heat exchanger, the inner shell placed inside the outer shell is made of a synthetic resin such as vinyl chloride on the bottomed cylindrical tube bundle plate with the outer peripheral surface fitted with a sealing material and the annular pipe bundle plate. And a heat transfer tube mounted on the outer peripheral portion of the tube bundle plate, the inner and outer shell structure of the heat exchanger of the compressed air dehumidifying device. 2. The compressed air according to claim 1, wherein one of the inner shells attached to the tube bundle plate is fixed by an adhesive, and the other one is formed by fitting a pipe material. Inner / outer shell structure of heat exchanger of dehumidifier. 3. A heat exchanger for a compressed air dehumidifier according to claim 1, wherein the heat transfer tube mounted on the outer periphery of the annular tube bundle plate projects toward the end plate of the outer case. Inner and outer body structure in. 4. A bottomed tubular tube bundle plate is made of a bowl shape having a protrusion at its apex, and when the protrusion contacts the end plate of the outer body, the sealing material of the tube bundle plate and the caulking position of the outer body The inner and outer shell structures in the heat exchanger of the compressed air dehumidifying device according to claim 1, wherein 5. The following steps af, a. Welding an end plate to one end of a cylindrical outer body, b. A step of inserting a pipe material made of a synthetic resin such as vinyl chloride into a bottomed tubular tube bundle plate having a sealing material on the outer peripheral surface thereof and an annular tube bundle plate, and fixing one of them to the tube bundle plate with an adhesive, c. A step of expanding and fixing the pipe after inserting the heat transfer tube into a circular hole provided in the vicinity of the outer periphery of the tube bundle plate, d. After steps b and c, insert the inner shell into the outer shell until the apex of the bottomed tubular tube bundle plate contacts the end plate, and crimp the outer shell from above the sealing material provided on the outer periphery of the tube bundle plate, Fixing the torso, e. Inserting a refrigeration cycle evaporator into the inner barrel and fixing it; f. A method of forming the inner and outer shells in a heat exchanger of a compressed air dehumidifying device, which comprises a step of sealing the other outer shell by welding with an end plate.