JPH0652135B2 - Method of forming straightening plate of straightening cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A method for manufacturing a straightening cylinder, more specifically, a method for manufacturing a straightening plate to be mounted on a straightening cylinder of a boiler body having a simple tubular structure, and a method for disposing such a straightening plate, With the object of providing a method for manufacturing a straightening vane that does not require a special machine tool, and a method for spirally placing the straightening vane, and arranging the arranging pitches successively smaller in accordance with the flow of the combustion gas, A straightening plate (16 (1) spirally attached to the straightening cylinder (17) for straightening the exhaust gas from the combustion chamber (19) of the boiler body and exchanging heat with the heat medium (12) through the heat exchange cylinder (14). ), 16 (2) ...
16 (n)) is short diameter D, long diameter (However, D is the diameter of the straightening cylinder, P (n) is the pitch created by the nth straightening plate 16 (n) in the exhaust gas flow direction), and an elliptical ring of width a
(28) is made (however, the width a is equal to the distance between the flow straightening cylinder 17 and the heat exchange cylinder), and the elliptical ring (28) is arranged in the major axis direction. Rectification characterized by being divided into two halves along the dividing line 29 of and formed as rectifying plates (16 (1), 16 (2) ... 16 (n)) of 1/2 elliptical pieces. The method includes a method of forming a straightening plate of a cylinder.

[Industrial application field]

The present invention is a method for manufacturing a rectifying cylinder, more specifically, a method for manufacturing a rectifying plate to be mounted on a rectifying cylinder of a boiler body having a simple tubular structure,
The present invention relates to a method of arranging the current plate.

[Conventional technology]

The present applicant has developed the boiler main body structure disclosed in Japanese Patent Application Laid-Open No. 63-207949, and the boiler main body uses the combustion heat of the burner 11 as the heat medium 12 when referring to FIG. In the boiler body structure for heat exchange,
A combustion cylinder 13 in which a burner 11 is attached in the axial direction of a combustion chamber 19, one heat exchange cylinder 14 independent of the combustion cylinder 13 for exchanging the combustion gas from the combustion cylinder 13, and a combustion cylinder 13 and heat. Exchange tube 14
The heat exchange cylinder 14 is provided with a connecting path 15 for connecting the two, a spiral flow rectifying plate 16 is arranged in the heat exchanging cylinder 14, and a lifting tool 23, a lid 24, a handle 25 and a heat insulating material 26 are attached and detached. A possible rectifying cylinder 17 is attached. 18 is an outer frame, 20 is a chimney connection port, 21
Is a water supply port, and 22 is a hot water outlet. Combustion cylinder 13, heat exchange cylinder 14,
Each of the flow straightening cylinders 17 has a circular cross section.

In the use of the boiler main body, the exhaust gas (combustion gas) rotates and rises in the heat exchange cylinder 14 while being guided by the straightening plate 16. At this time, the centrifugal force acting on the exhaust gas makes contact with the heat exchange cylinder 14 so as to lick it, and exchanges heat with the heat medium (boiler water) 12.

In the above-mentioned boiler main body, while maintaining a good heat exchange rate, the boiler main body has a simple tubular structure to reduce the manufacturing cost, and the rectifying cylinder can be attached to and detached from the boiler main body. And the method of manufacturing this rectification cylinder at low cost is called for.

As shown in FIG. 3, the current plate arranged in the current cylinder 17
Although the 16 is continuously attached in a spiral shape, the straightening vane 16 is manufactured by a special machine tool, and is made by dividing a part of an ellipse into small pieces and joining them.

[Problems to be Solved by the Invention]

In this conventional method, there is a problem that the cost of the flow straightening cylinder itself equipped with the flow straightening plate becomes high, and the cost of the boiler main body becomes high as a whole.

Therefore, the present invention is a method for manufacturing a flow straightening cylinder equipped with a flow straightening plate that is inexpensive and does not require a special machine tool. The flow straightening plate is arranged in a spiral shape and the pitch is gradually reduced according to the flow of combustion gas. The purpose is to provide a method of doing.

[Means for Solving the Problems]

The above-mentioned problem is that the straightening plate spirally attached to the straightening cylinder for straightening the exhaust gas from the combustion chamber of the boiler body and exchanging heat with the heat medium through the heat exchange cylinder has a short diameter D and a long diameter. (Where D is the diameter of the straightening cylinder, P (n) is the pitch created by the nth straightening plate in the exhaust gas flow direction), and an elliptical ring of width a is created (where width a is the straightening cylinder and the heat exchange cylinder). The length equal to the distance between) and the ellipse Rectification characterized by being divided into two halves along the dividing line 29 of and formed as rectifying plates (16 (1), 16 (2) ... 16 (n)) of 1/2 elliptical pieces. This is solved by the method of forming the straightening plate of the cylinder.

[Action]

That is, according to the present invention, since the current plate is formed by dividing the elliptical ring shown in FIG. 2 into two equal parts, the current plate can be formed without depending on a special machine tool as in the conventional case.

〔Example〕

 Hereinafter, the present invention will be specifically described with reference to the illustrated embodiments.

An embodiment of the present invention is shown in a front view in FIG. 1, in which the same parts as those shown in FIGS. 3 to 4 are designated by the same reference numerals, and 16 (1) ... 16 (5 ) Is a straightening plate, P ₍₁₎ and P ₍₂₎ are pitches made by the first and second straightening plates 16 (1), 16 (1) and 16 (2), 16 (2), d is the second The length of the dividing line 29 in the figure and D indicate the diameter of the flow straightening cylinder 17.

In the present invention, the structure of the boiler main body does not differ from the example shown in FIG. 4, and only the rectifying plate attached to the rectifying cylinder 17 having a circular cross section is different, and the rectifying cylinder 17 has a connecting path 15 shown in FIG.
Contact the boiler combustion chamber 19 by.

In the present invention, the current plate is formed by dividing the elliptical ring 28 shown in FIG. 2 into 1/2 (divided into two) without using a special machine tool. In this elliptical ring, if the minor axis D is equal to the diameter of the heat exchange tube 14, the major axis becomes Becomes

At this time, the length d of the dividing line 29 that divides the ellipse ring into two equal parts along the major axis is equal to the width in the minor axis direction when the ellipse ring is equally divided along the minor axis D. If the width a is set to be equal to the distance between the 17 and the heat exchange tube 14, Becomes

However, P (n) is n from the bottom of the straightening cylinder 17 in FIG.
This is the pitch created by the second straightening plates 16 (n) and 16 (n).

Such an elliptical ring 28 is divided into two equal parts along a dividing line 29, and two half-divided elliptical straightening plates 16 (n) make up one pitch, and these elliptical straightening plates are divided. 16 (1), 16 (1), 16 (2), 16
(2) ... 16 (n), 16 (n) are attached in order to the outer wall 27 of the straightening cylinder 17 of the straightening cylinder 17 as shown in FIG. Heat exchange tube 17
The gap between the rectifying cylinder 14 and the rectifying cylinder 14 is completely closed by the rectifying plate to guide the exhaust gas properly upward.

In addition, the pitch P mentioned above is such that P (1)> P (2) ... P (n) has the maximum pitch of the lowermost straightening plates 16 (1), 16 (1), It is formed so that it becomes smaller as it goes, and when the exhaust gas has just come out from the communication path 15 and is in the highest temperature state, the area in contact with the rectifying cylinder 17 is the largest, and this area rises and the temperature decreases. As it goes down, it becomes smaller gradually and efficient heat exchange is performed.

When the straightening vanes are attached as described above, the respective straightening vanes are not aligned on the same plane but intersect, but in terms of performance, the example shown in FIG. 3, that is, a single piece without crossing is used. It was confirmed that there is almost no difference from the case of connecting as described above.

The manufacturing cost of the rectifying cylinder having the rectifying plate according to the present invention shown in FIG. 1 is equal to the manufacturing cost of the rectifying cylinder shown in FIG.
It became 60%.

〔The invention's effect〕

As described above, according to the present invention, the manufacturing and mounting of the flow straightening plate mounted on the flow straightening cylinder of the boiler body does not depend on the special machine tool, so that not only the cost is reduced, but also the arrangement pitch is changed in the flow direction of the exhaust gas. Therefore, the heat exchange rate of the heat medium is increased because the heat exchange rate is gradually decreased.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a plan view illustrating a method of manufacturing a current plate of the present invention, FIG. 3 is a front view of a conventional example, and FIG. 4 is a boiler developed by the present applicant. FIG. 5 is a vertical cross-sectional view of the main body, and FIG. 5 is a partial cross-sectional view of the flow straightening cylinder of the boiler main body shown in FIG. In the figure, 11 is a burner, 12 is a heat medium (boiler water), 13 is a combustion cylinder, 14 is a heat exchange cylinder, 15 is a connecting passage, 16, 16a, 16b, 16 (1), 16 (2) ... 16 (n) is a straightening plate, 17 is a straightening cylinder, 18 is an outer frame, 19 is a combustion chamber, 20 is a chimney connection port, 21 is a water supply port, 22 is a tap hole, 23 is a hanger, 24 is a lid, 25 is A handle, 26 is a heat insulating material, 27 is a rectifying cylinder outer plate, 28 is an elliptical ring, 28a is an inner ellipse, 28b is an outer ellipse, and 29 is a dividing line.

Claims (2)

[Claims] Claims: 1. A rectifier mounted in a spiral shape on a rectification cylinder (17) for rectifying exhaust gas from a combustion chamber (19) of a boiler body and exchanging heat with a heat medium (12) through a heat exchange cylinder (14). Board (16
(1), 16 (2) ・ ・ ・ 16 (n) are short diameter D, long diameter (However, D is the diameter of the straightening cylinder, P (n) is the pitch created by the nth straightening plate 16 (n) in the exhaust gas flow direction), and an elliptical ring of width a
(28) is made (however, the width a is the length equal to the distance between the flow straightening cylinder 17 and the heat exchange cylinder), and the elliptical ring (28) is arranged in the major axis direction. Rectification characterized by being divided into two halves along the dividing line 29 of and formed as rectifying plates (16 (1), 16 (2) ... 16 (n)) of 1/2 elliptical pieces. Method of forming a straightening plate for a cylinder. 2. The method of forming a straightening vane of a straightening cylinder according to claim 1, wherein the pitch P (n) is gradually reduced along the flow direction of the exhaust gas.