JPH0694389A - Heat exchanger - Google Patents

Abstract

PURPOSE:To provide a heat exchanger which can be coped with easy calculation of a strength while obtaining required straightening function. CONSTITUTION:A heat exchanger has a plurality of heat transfer tubes 11 arranged in a body 10 to heat exchange fluid to be guided from a fluid inlet 12 into the body 10 with fluid flowing in the tubes 11, and comprises straightening plates 14, 15 contained to be disposed in the body 10 to uniformly guide the fluid to the tubes 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for heating or cooling a fluid through a plurality of heat transfer tubes arranged inside a body.

[0002]

2. Description of the Related Art Generally, a heat exchanger used for heating or cooling a fluid is of a type using a heat transfer tube. That is, as shown in FIG. 6, a plurality of heat transfer tubes 2 are arranged inside the body 1, and heat exchange is performed between the fluid introduced from the fluid inlet pipe 3 into the body 1 and the fluid flowing through the heat transfer tube 2. To do.

Here, the heat exchanger can be either a cooler or a heater depending on the temperature of the fluid in the heat transfer tube 2, but since it has the same structure, the case where it is applied as a cooler will be described below.

The cross-sectional areas of the fluid inlet pipe 3 and the fluid outlet pipe 4 are larger than the cross-sectional area of the body 1 in which the heat transfer tubes 2 are installed. Therefore, the fluid flowing from the fluid inlet pipe 3 into the body 1 flows uniformly through the heat transfer tube 2, and the lower straightening vanes 5 and the upper straightening vanes 6 are provided at the inlet and the outlet to prevent uneven flow. . The heat exchanger is supported by support legs 7 fixed to the side surface of the body 1.

[0005]

By the way, the structure and shape of the current plate vary depending on the type of fluid, the flow rate, the size of the body 1, the diameter of the pipes connected to the fluid inlet pipe 3 and the fluid outlet pipe 4, and the like. In the case of the conventional heat exchanger shown in FIG. 6, since the body 1 is a quadrangular prism and the fluid inlet pipe 3 and the fluid outlet pipe 4 are circular, it has a complicated shape in which pyramids and curved surfaces are combined. Also, the dimensions will differ depending on the flow rate.

Here, the heat exchanger generally needs to calculate the strength of the can body as a pressure vessel. This strength calculation has a fixed calculation method for general shapes such as cylinders,
It can be calculated easily. For example, in general, JIS, pressure vessel structure standards, and in the case of nuclear facilities, technical standards such as structure related to nuclear power generation facilities (Science and Technology Agency, technical standards related to structure of reprocessing facility (draft)), etc. Its possible shape and the evaluation method of its strength calculation are specified.

That is, the thickness required for calculation of the flat plate of the pressure vessel, which is not supported by the stay, is calculated by the following formula.

[0008]

[Formula 1] t = d {(Z · C · P) / 100 · S} ^{1/2 In} this term, t is the thickness (mm) necessary for the calculation of the flat plate,
d is the diameter or minimum span (mm), C is a constant determined by the mounting method of the flat plate, P is the maximum working pressure (Kg / cm ² ),
S is the allowable tensile stress of the material at the maximum operating temperature (Kg / mm
² ) and Z are constants determined by the shape of the flat plate. For circular flat plates, it is set to 1, and for non-circular flat plates, the following formula is used. However, when the value exceeds 2.5, it is set to 2.5.

[0009]

## EQU2 ## Z = 3.4- (2.4d / D) In this formula, D represents the maximum span (mm) measured at right angles to the minimum span.

On the other hand, a calculation method for a complicated shape such as the lower straightening plate 5 and the upper straightening plate 6 shown in FIG. 6 is not specified. In this case, it is necessary to perform a numerical analysis such as the finite element method or perform a verification test to specifically prove that the strength is appropriate. In particular,
When examining the strength of each device, such as in a nuclear facility,
It is extremely difficult to prove its strength by a special method, and as a result, there is a problem that it takes time and effort for numerical analysis and verification test.

The present invention has been made in consideration of the above-mentioned circumstances, and an object thereof is to provide a heat exchanger which can easily cope with strength calculation while ensuring a required rectifying function.

[0012]

In order to solve the above-mentioned problems, a heat exchanger according to the present invention has a plurality of heat transfer tubes arranged inside a body, and a fluid introduced from a fluid inlet into the body. In a heat exchanger for exchanging heat with the fluid flowing in the heat transfer tube, a rectifying plate that uniformly guides the fluid to the heat transfer tube is housed and arranged in the body.

[0013]

In the present invention having the above-mentioned structure, since the straightening vanes are housed and arranged in the body, only the body is subjected to the strength calculation, and the strength calculation of the straightening plate is not necessary.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of the heat exchanger according to the present invention. As shown in FIGS. 1 and 2, the body 10 includes an intermediate body 10a, an upper body 10b, and a lower body 10c. The body 10 is formed into a prismatic shape and has the same wall thickness. A large number of cylindrical heat transfer tubes 11 are arranged inside the.

A fluid inlet pipe 12 is fixed to the bottom surface of the lower body 10c of the body 10, and a fluid is guided from the fluid inlet pipe 12. On the other hand, the fluid outlet pipe 13 is fixed to the upper surface of the upper body 10b of the body 10, and the fluid is discharged from the fluid outlet pipe 13.

A lower straightening vane 14 is installed in the body 10 immediately above the fluid inlet pipe 12, and the lower straightening vane 14 uniformly guides the fluid to a large number of heat transfer tubes 11.
Then, in the body 10 immediately below the fluid outlet pipe 13, as shown in FIGS. 1 and 5, an upper straightening plate 15 is installed continuously to the fluid outlet pipe 13. These lower straightening vanes 1
Lower drain drains 16 and upper drain drains 17 are provided at predetermined locations on the upper plate 4 and the upper flow straightening plate 15, respectively, to prevent the drain from staying.

Further, water chambers 21 and 22 are provided on both sides of the intermediate body 10a of the body 10 so as to face each other, and a cooling water inlet pipe 23 and a cooling water outlet pipe 24 are attached above and below the water chamber 21, respectively. Has been. In the water chambers 21 and 22, the partition plates 2 whose positions are vertically different from each other are provided.
5, 26 are fixed, and the heat transfer pipe 1 is provided from the cooling water inlet pipe 23.
The cooling water led to 1 meanders and passes, and the fluid inlet pipe 1
It is designed to sufficiently exchange heat with the fluid derived from 2.

That is, heat is exchanged between the fluid introduced from the fluid inlet pipe 3 into the body 10 and the cooling water passing through the heat transfer tube 11, and the fluid after the heat exchange passes through the upper straightening vane 15. It is discharged from the fluid outlet pipe 13.

The heat exchanger of this embodiment is shown in FIGS.
It is supported by the support legs 27 fixed to the side surface of the body 10 as shown in FIG.

Next, the operation of this embodiment will be described.

The lower straightening plate 14 and the upper straightening plate 15 are
Since the internal structure is housed and arranged inside the body 10, the portion where the strength calculation is performed as the pressure vessel is the body 1
Since only 0, the strength evaluation of the lower straightening plate 14 and the upper straightening plate 15 becomes unnecessary.

Further, the body 10 is composed of a prism whose strength evaluation has been established, and the strength can be easily calculated.
It can be shown that the pressure vessel is appropriate in terms of strength.
The lower rectifying plate 14 and the upper rectifying plate 15 can adopt the most suitable shape in terms of fluid rectifying effect regardless of the pressure resistance.

Furthermore, by making the intermediate cylinder 10a, the upper cylinder 10b, and the lower cylinder 10c have the same thickness, it is possible to manufacture using materials having the same thickness, which facilitates machining of the plate material and assembly. The groove processing and welding work become easy. As a result, manufacturing becomes easier and reliability is improved.

Since the lower rectifying plate 14 and the upper rectifying plate 15 having a complicated shape are enclosed in the body 10 and excluded from the strength members, it is possible to manufacture them with a thin plate, which can be easily manufactured.

The present invention is not limited to the above embodiment, but various modifications can be made. For example, although the body 10 is formed in a prismatic shape in the above-described embodiment, the same effect can be obtained even if the shape is other, for example, a cylindrical shape. In the above embodiment,
Although the lower drain drain 16 and the upper drain drain 17 are provided on the entire circumference of the lower straightening vane 14 and the upper straightening vane 15, the same effect can be expected only by forming a small hole.

[0027]

As described above, according to the heat exchanger of the present invention, the pressure intensity of the heat exchanger can be calculated by arranging the rectifying plate that uniformly guides the fluid to the heat transfer tube in the body. The established method allows easy analysis and facilitates manufacturing. As a result, it is possible to avoid the proof of the validity of the strength, which is required by the conventional heat exchanger, for example, by the proof test.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view showing an embodiment of a heat exchanger according to the present invention.

FIG. 2 is an external view of the heat exchanger of FIG.

FIG. 3 is a plan view of the heat exchanger of FIG.

FIG. 4 is a cross-sectional view taken along the line AA in FIG.

5 is an enlarged perspective view showing an upper current plate and a fluid outlet pipe of the heat exchanger of FIG.

FIG. 6 is a partial cross-sectional front view showing a conventional heat exchanger.

[Explanation of symbols]

 10 Body 10a Intermediate Body 10b Upper Body 10c Lower Body 11 Heat Transfer Tube 12 Fluid Inlet Piping 13 Fluid Outlet Piping 14 Lower Rectifier 15 Upper Upper Rectifier 16 Lower Drain 17 Upper Drain 21 Water Chamber 22 Water Chamber 23 Cooling Water Inlet Pipe 24 Cooling water outlet pipe 25 Partition plate 26 Partition plate 27 Support leg

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Hagiwara 1-14-1, Minami-Biery, Yokohama-shi, Kanagawa JGC Corporation Yokohama Office

Claims (1)

[Claims] 1. A heat exchanger in which a plurality of heat transfer tubes are arranged inside a body, and heat is exchanged between a fluid introduced from a fluid inlet into the body and a fluid flowing in the heat transfer tube. A heat exchanger characterized in that a straightening plate for uniformly guiding a fluid to the inside is housed and arranged in the body.