JP2003200223A - Manufacturing method of heat transfer element in rotary regenerative heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a heat transfer element in a rotary regenerative heat exchanger which can form an undulation and a notch (large wave) in a correct profile without breaking a formed part of the undulation (small wave) as much as possible, and can shorten the crimping time by a simple equipment which does not require any synchronizing mechanism of a roll. <P>SOLUTION: In the rotary regenerative heat exchanger in which the rotor is rotated in a housing, the heat transfer element stored in the rotor is heated for heat accumulation by a hot fluid such as an exhaust gas, and a cold fluid such as air for combustion is heated by the heat accumulated in the heat transfer element, a steel plate P is continuously drawn by a crimping roll 1 with a wave die 1a for undulation (small wave) and a wave die 1b for notch (large wave) formed on the heat transfer element formed on a surface thereof. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing a heat transfer element in a rotary regeneration heat exchanger.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 5, a rotary regenerative heat exchanger of this type includes a rotor R rotatably mounted in a housing H and a heat transfer function as a heat storage body in the rotor R. It is configured to transfer heat of the high temperature fluid to the low temperature fluid by loading the element E and alternately contacting the high temperature fluid (such as exhaust gas) and the low temperature fluid (such as combustion air) with the heat transfer element E. There is. The heat transfer element E
As shown in FIG. 6, they are stored in a stacked state in the basket B so that they can be easily handled and maintained.

The heat transfer element E has, for example, as shown in FIG. 7, a wave shape composed of an undulation (small wave) E1 and a notch (large wave) E2. In the undulation (small wave) E1, the peaks and valleys of the waveform are oblique to the fluid flow direction F (Au = 10 to 40 °).
It is oriented in the direction of to improve the heat transfer effect. On the other hand, the notch (large wave) E2 is oriented in the fluid flow direction F, and the peaks and valleys thereof are larger than those of the undulation (small wave). The peaks and troughs of these notches (large waves) E2 abut the peaks and troughs of the above undulations (small waves), and as a result, the interval between adjacent heat transfer elements E is kept constant. . The interval (pitch) of the notches (large waves) E2 is set to be several times larger (about 4 times in the illustrated example) than that of the undulation (small waves). These undulations (small waves) E1 and notches (large waves) E
The corrugated shape of 2 disturbs the flow of the fluid and improves the heat exchange efficiency. The heat transfer elements E are stacked so that the directions of undulations (small waves) E1 between the adjacent heat transfer elements E intersect each other. That is, the lower heat transfer element E shown in FIG.
Indicates that the upper heat transfer element E is turned upside down.

By the way, conventionally, when manufacturing the wave-shaped heat transfer element E composed of the undulation (small wave) E1 and the notch (large wave) E2, the shapes and forming angles of the undulation E1 and the notch E2 are different. Because of the difference, as shown in FIG. 8A, first, the undulation (small wave) E1 is formed by the first crimping roll (thin plate forming roll) K1, and then, as shown in FIG.
Second crimping roll K as shown in (B)
The notch (large wave) E2 is formed by step 2, and the forming process is performed in two steps.

As described above, since the heat transfer element is designed to form the notch E2 after the undulation E1, the undulation E1 is once crushed before the remolding process when forming the notch E2. There must be. In particular, when the drawing depth is deep, notches E2 become slanted and an accurate profile cannot be formed. In addition, such two-step molding takes time, and the crimping work before and after is performed. There were problems such as the need for a mechanism and adjustment for synchronizing the.

Also, the undulation E1 and the notch E
Since the respective shapes of No. 2 are different and the contraction rate after forming is also different, the peripheral velocities of the rolls K1 and K2 are also different. Therefore, it is necessary to synchronize the rotational speeds with each other. As the tuning mechanism, first, the forming plate is supplied to the undulation roll at a certain speed (for example, 10 m / min) to form the undulation E1, and then the notch roll is about 1 / of the initial plate speed. Sent at 1.15. Furthermore, the plate coming out of the notch roll is further reduced in speed to about 1 / 1.3 of the initial plate speed, so each roll uses a tuning mechanism to match the rotational speed of both rolls to the plate speed, It was necessary to adjust the plate speed by a mechanism that adjusts the plate by bending it between the two rolls in a planetary motion.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. The object of the present invention is to prevent the undulation (small wave) from being crushed as much as possible. It is possible to shape the ration and notch (large wave) into an accurate profile,
Another object of the present invention is to provide a method of manufacturing a heat transfer element in a rotary regenerative heat exchanger that can shorten the clipping time with simple equipment that does not require a roll tuning mechanism.

[0008]

A method of manufacturing a heat transfer element in a rotary regenerative heat exchanger according to the present invention comprises rotating a rotor in a housing, and setting the heat transfer element housed in the rotor to a high temperature fluid such as exhaust gas. In a rotary regenerative heat exchanger that heats a low temperature fluid such as combustion air by the heat stored in the heat transfer element to heat the low temperature fluid for undulation (small wave) formed in the heat transfer element. It is characterized in that a steel plate is continuously drawn by a crimping roll having a corrugated pattern and a notch (large wave) corrugated pattern formed on the surface. Further, the undulation corrugation is formed at a twist angle of 10 to 40 degrees with respect to the rotation axis direction of the crimping roll. Further, the undulation corrugation and the notch corrugation are alternately formed on the surface of the crimping roll. Still further, the invention is characterized in that a groove is formed parallel to the rotation axis direction of the surface of the crimping roll having the undulation corrugation, and a notch insert corrugation is embedded in the groove.
Furthermore, the invention is characterized in that stopper corrugations are formed at both ends in the circumferential direction of the notch insert corrugation.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 (A) and 1 (B), 1 is a crimping roll, and as shown in an enlarged view in FIG. 1 (C), a undulation wave pattern 1a and a notch (large wave) are formed on the surface thereof. Wave type 1
b is formed. As is clear from FIG. 1 (A),
The corrugation 1a for undulation (small wave) has a constant angle (Au) with a twist angle of 10 ° to 40 ° with respect to the rotation axis of the crimping roll 1 like a screw gear. The notch (large wave) corrugation 1b is formed parallel to the rotation axis of the crimping roll 1.

The pair of upper and lower crimping rolls 1, 1 are
The undulation (small wave) corrugation 1a and the notch (large wave) corrugation 1b are in a state in which a predetermined gap (heat transfer element plate thickness) is maintained, and their twist directions are opposite to each other. , And it is designed to rotate synchronously. In addition, a pair of crimping rolls 1, 1
The interval or pressure can be changed according to the type of the steel plate to be processed or the undulation depth (heat transfer element plate thickness adjustment) or the notch depth (heat transfer element interval adjustment). Further, the diameter of the crimping roll 1 and the number of the corrugations 1a and 1b can be changed as necessary.

Stopper corrugations S for crushing and stopping the undulations (small waves) are formed at both ends in the circumferential direction of the notch (large wave) insert corrugation 1b.
As a result, the respective moldings can be performed at one time (with a pair of crimping rolls) without being affected by the two different shapes, and the heat transfer efficiency is not affected. The tops of the pair of upper and lower stopper corrugations S are formed so as to be in contact with each other in order to adjust meshing, and are formed so as not to perform undulation molding.

In this state, when the steel plate P to be processed is supplied, the undulation (small wave) E1 is formed between the undulation (small wave) corrugations 1a, 1a of the upper and lower crimping rolls 1, 1. , Above notch (large wave)
A notch (large wave) E2 is formed between the wave patterns 1b and 1b,
A DUN (double undulation notched) type heat transfer element E as shown in FIG. 2 is continuously drawn. As the steel plate P, for example, a plate thickness of 0.5 to
A 1.2 mm cold rolled steel plate (standard steel such as SPCC, corrosion resistant steel, steel for enamel such as SPP and special purpose material such as SUS) is used.

FIG. 3 (A) shows another embodiment of the crimping roll, in which a corrugation 2a for undulation (small wave) is formed on the surface of the crimping roll 2 and a rotary shaft is provided between them. Form a groove along the notch (large wave)
The insert corrugated mold 2b is fitted and fixed to the crimping roll 2 with the mounting screw 4 or the like. With this configuration, the depth of the notch (large wave) insert wave 2b is independent of the depth of the undulation (small wave) wave 2a (heat transfer element plate thickness) and the notch (large wave) depth (adjacent heat transfer) Element spacing adjustment) can be changed.

Stopper corrugations S for crushing and stopping the undulations (small waves) are formed at both ends of the notch (large wave) insert corrugation 2b in the circumferential direction.
The top portions of the pair of upper and lower stopper corrugations S are formed so as to be displaced from each other in order to adjust the meshing, and the side surfaces are in contact with each other so that the undulation is not formed.

FIG. 4A shows a DNF (double undulation notched and flat) type heat transfer element E ', in which a plane E3 is formed on a part of the undulation (small wave) E1. According to Fig. 4
As shown in (B), when these are stacked, the plane E
The notch (large wave) E2 is in contact with the top of the notch 3. When molding the DNF type heat transfer element E'of the present embodiment, a crimping roll (not shown) in which a part of the undulation (small wave) corrugation is a flat surface is used.

The crimping roll 1 of the above embodiment has two notches (large wave) corrugations 1b in the diametrical direction.
It may have one or three or more. Also,
The diameter of the crimping roll 1 can also be set arbitrarily.

[0017]

EFFECTS OF THE INVENTION Not only can undulations (small waves) and notches (large waves) be formed into accurate profiles, but also clipping time can be shortened with simple equipment.

[Brief description of drawings]

FIG. 1 is a front view (A) showing an embodiment of a clipping roll for carrying out a method for manufacturing a heat transfer element according to the present invention, an EY cross-sectional view (B) and an enlarged cross-sectional view (C) of molding. .

FIG. 2 is a perspective view of a heat transfer element formed by the crimping roll of FIG.

FIG. 3 is a cross-sectional view (A) showing another embodiment of the crimping roll, a notch wave type attachment explanatory view (B) and an enlarged cross-sectional view (C) of molding.

FIG. 4 is a perspective view (A) of a DNF type heat transfer element and an explanatory view (B) of a stacked state thereof.

FIG. 5 is a partially cutaway perspective view of a rotary regeneration heat exchanger.

FIG. 6 is a perspective view of a basket loaded in the rotor of FIG.

7 is an explanatory view of a heat transfer element housed in a stacked state in the basket of FIG.

FIG. 8 is an explanatory diagram of a conventional method for manufacturing a heat transfer element.

[Explanation of symbols]

1 crimping roll 1a Wave form for undulation (small wave) 1b Waveform for notch (large wave) 2 crimping rolls 2a Wave form for undulation (small wave) 2b Notch (Large Wave) Insert Wave Type Angle of Au undulation (small wave) B basket E, E'heat transfer element E1 undulation (small wave) E2 Notch (Large wave) E3 plane F Fluid flow direction H housing Wave type for K1 undulation (small wave) K2 Notch (Large Wave) Wave Type P steel plate R rotor S stopper wave type

Claims (5)

[Claims] 1. A rotor is rotated in a housing to heat a heat transfer element housed in the rotor with a high temperature fluid such as exhaust gas to store heat, and combustion heat etc. is generated by the heat stored in the heat transfer element. In the regenerative heat exchanger that heats the low temperature fluid, the steel plates are continuously joined by the crimping rolls with the undulation (small wave) corrugation and the notch (large wave) corrugation formed on the heat transfer element. A method for manufacturing a heat transfer element, characterized by performing a draw forming process. 2. The corrugation for undulation is formed at a twist angle of 10 to 40 degrees with respect to the rotational axis direction of the crimping roll.
The method for manufacturing the heat transfer element according to 1. 3. The method for manufacturing a heat transfer element according to claim 1, wherein the undulation corrugations and the notch corrugations are alternately formed on the surface of the crimping roll. . 4. A groove is formed parallel to the rotation axis direction of the surface of the crimping roll having the undulation corrugation, and a notch insert corrugation is embedded in the groove. The method for manufacturing the heat transfer element according to claim 1. 5. The method of manufacturing a heat transfer element according to claim 4, wherein stopper corrugations are formed at both ends of the notch insert corrugation in the circumferential direction.