JP2713647B2 - Heat exchanger - Google Patents
Heat exchangerInfo
- Publication number
- JP2713647B2 JP2713647B2 JP2193036A JP19303690A JP2713647B2 JP 2713647 B2 JP2713647 B2 JP 2713647B2 JP 2193036 A JP2193036 A JP 2193036A JP 19303690 A JP19303690 A JP 19303690A JP 2713647 B2 JP2713647 B2 JP 2713647B2
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- heat exchange
- resonance
- sound
- sound field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ボイラ、ガスヒータ等の熱交換器に関す
る。Description: TECHNICAL FIELD The present invention relates to a heat exchanger such as a boiler and a gas heater.
第２図に示すように、従来のガス流れに直角方向に、
かつ、互いに平行をなして配置された複数の熱交換管１
から成る管群を内蔵する熱交換器においては、管群の中
で熱交換器１から発生する放出渦２の周波数と熱交換器
内の音場の周波数の一致（共鳴）を避けるため、熱交換
器内にガス流れ方向、かつ熱交換管１の軸方向に配置さ
れた複数の仕切板4a〜4eを挿入し、音場の固有周波数を
上昇させている。As shown in FIG. 2, in the direction perpendicular to the conventional gas flow,
And a plurality of heat exchange tubes 1 arranged in parallel with each other.
In a heat exchanger having a tube bank composed of a heat exchanger, the frequency of the emission vortex 2 generated from the heat exchanger 1 in the tube bank and the frequency of the sound field in the heat exchanger do not match (resonance). A plurality of partition plates 4a to 4e arranged in the gas flow direction and in the axial direction of the heat exchange tube 1 are inserted into the exchanger to increase the natural frequency of the sound field.
前記の従来の熱交換において、管群を流速Ｖをもつ流
れが通過すると、熱交換管１からは （Ｄは熱交換管の外径、Stはストローハル数）の周波数
をもつ渦２が放出される。この放出渦２の周波数fsが熱
交換器の幅Ｌで決定される音場の周波数 （Ｃは流体の音速、ｎ＝1,2,3,……）と一致すると、幅
方向に音場の共鳴が発生し、騒音が問題となる。In the above-mentioned conventional heat exchange, when a flow having a flow velocity V passes through the tube group, the heat exchange tube 1 A vortex 2 having a frequency of (D is the outer diameter of the heat exchange tube, St is the number of Strouhal) is emitted. The frequency fs of this vortex 2 is the frequency of the sound field determined by the width L of the heat exchanger When (C is the sound velocity of the fluid, n = 1, 2, 3,...), Resonance of the sound field occurs in the width direction, and noise becomes a problem.
従来はこの共鳴を避けるために、前記のように複数の
仕切板4a〜4eを挿入して音場の最低次の固有周波数 （Ｂは仕切板の間の間隔）を放出渦の周波数fsより高く
なるようにしていた。この場合には、熱交換器内の流体
の流速Ｖが速くなり放出渦の周波数が増大すると、仕切
板の枚数も増加させ、仕切板の間の間隔を減小させなけ
ればならないという問題点があった。Conventionally, in order to avoid this resonance, a plurality of partition plates 4a to 4e are inserted as described above to insert the lowest natural frequency of the sound field. (B is the distance between the partition plates) was set to be higher than the frequency fs of the discharge vortex. In this case, when the flow velocity V of the fluid in the heat exchanger increases and the frequency of the discharge vortex increases, there is a problem that the number of partition plates must be increased and the interval between the partition plates must be reduced. .
本発明は、従来の熱交換器のもつ以上の問題点を解決
しようとするものである。The present invention seeks to solve the above-mentioned problems of the conventional heat exchanger.
本発明は、流れに直角方向に、かつ互いに平行をなし
て配置された複数の熱交換管からなる管群の内蔵した熱
交換器において、同熱交換器内の音場の共鳴音波長の1/
4だけ熱交換器の壁面から熱交換器の内方へ間隔を隔て
ゝ、ガス流れ方向に、かつ、熱交換管の軸方向に吸音材
を設置した。The present invention relates to a heat exchanger having a built-in tube group consisting of a plurality of heat exchange tubes arranged in a direction perpendicular to the flow and parallel to each other, wherein the resonance wavelength of the sound field in the heat exchanger is 1%. /
The sound absorbing material was installed in the direction of gas flow and in the axial direction of the heat exchange tube at intervals of 4 from the wall surface of the heat exchanger to the inside of the heat exchanger.
吸音材の両面で生じる圧力差Δｐは吸音材の流れ抵抗
Ｒと流体の粒子速度変動ｕを用いて次式で表わされる Δｐ＝Ru …（１） 粒子速度変動ｕの値の大きな位置に吸音材を設置すれ
ば吸音材両面での圧力差Δｐが増大し、吸音材によるエ
ネルギ吸収が増大して、音場の共鳴の振幅が小さくな
る。The pressure difference Δp generated on both sides of the sound absorbing material is expressed by the following equation using the flow resistance R of the sound absorbing material and the particle velocity fluctuation u of the fluid: Δp = Ru (1) Is installed, the pressure difference Δp on both sides of the sound absorbing material increases, the energy absorption by the sound absorbing material increases, and the amplitude of the resonance of the sound field decreases.
一方、音場が共鳴した状態での圧力変動ｐと粒子速度
変動ｕは次式で表わされる。On the other hand, the pressure fluctuation p and the particle velocity fluctuation u when the sound field resonates are expressed by the following equations.
ただし、ｘは音場の端部から幅方向にとった座標値、
po,u0は圧力、粒子速度の最大値、ｎは共鳴の次数。 Where x is the coordinate value taken in the width direction from the end of the sound field,
po, u 0 is the maximum value of pressure and particle velocity, and n is the order of resonance.
本発明では、熱交換器内の対象とする共鳴音波の波長 だけ熱交換器の壁面から熱交換器の内方へ間隔を隔て
ゝ、ガス流れ方向に、かつ熱交換管の軸方向に吸音材が
設置されているので、前記（３）式の共鳴発生時の粒子
速度変動ｕが最大となり、従って、前記（１）式の吸音
材の両面で生ずる圧力差Δｐが最大となり、熱交換管か
らの放出渦と熱交換器音場の共鳴の発生時に最大の吸音
効果が得られる。In the present invention, the wavelength of the target resonance sound wave in the heat exchanger Only at a distance from the wall of the heat exchanger to the inside of the heat exchanger, the sound absorbing material is installed in the gas flow direction and in the axial direction of the heat exchange tube. The particle velocity fluctuation u becomes maximum, and the pressure difference Δp generated on both sides of the sound absorbing material of the above formula (1) becomes maximum, and the maximum occurs when the vortex emitted from the heat exchange tube and the sound field of the heat exchanger generate resonance. A sound absorbing effect is obtained.
本発明の一実施例を、第１図によって説明する。 One embodiment of the present invention will be described with reference to FIG.
上下方向に筒状をなす熱交換器の上方から、矢印に示
すように、流速Ｖのガスが熱交換器の側壁５と平行に導
入され、同熱交換器内には、ガスの流れ方向に直角に、
かつ互いに平行に配置された複数の熱交換管１からなる
管群が内蔵されている。管群を通過したガスはその方向
を変えて、矢印に示すように、ほゞ水平方向に熱交換器
から排出されるようになっている。また熱交換器の幅Ｌ
で決定される熱交換器内の対象とする音場の共鳴音波長
の1/4だけ熱交換器の両方の側壁５からそれぞれ内方へ
間隔Ｗを隔てゝ、ガス流れ方向に、かつ熱交換管１の軸
方向に平行に吸音材3a,3bが設置されている。As shown by an arrow, a gas having a flow velocity V is introduced in parallel with the side wall 5 of the heat exchanger from above the vertically-shaped cylindrical heat exchanger, and the gas flows in the heat exchanger in the gas flow direction. At right angles,
Further, a tube group including a plurality of heat exchange tubes 1 arranged in parallel with each other is incorporated. The gas passing through the tube group changes its direction and is discharged from the heat exchanger in a substantially horizontal direction as indicated by an arrow. The width L of the heat exchanger
1 from each side wall 5 of both sides of the heat exchanger in the direction of gas flow and the heat exchange direction by 1 of the resonance wavelength of the sound field of interest in the heat exchanger determined by Sound absorbing materials 3a and 3b are installed in parallel to the axial direction of the tube 1.
本実施例において、熱交換器内の音場が共鳴した状態
における粒子速度変動ｕと圧力変動ｐは、「作用」欄に
記載した式（２），（３）の通りであり、これが第１図
中に示されている。In the present embodiment, the particle velocity fluctuation u and the pressure fluctuation p in a state where the sound field in the heat exchanger resonates are as shown in Expressions (2) and (3) in the column of “action”, and this is the first equation. It is shown in the figure.
吸音材3a,3bは、前記のように、共鳴発生時の粒子速
度変動ｕの最大となる側壁５から熱交換器内の音場の共
鳴音波長の1/4だけ離れた位置に設けられているため
に、熱交換管１から放出渦２と熱交換器音場との共鳴が
発生してもこの吸音材3a,3bによって、最大の吸音効果
を得ることができる。As described above, the sound absorbing materials 3a and 3b are provided at positions away from the side wall 5 where the particle velocity variation u at the time of resonance occurrence is the maximum by 1/4 of the resonance sound wavelength of the sound field in the heat exchanger. Therefore, even when resonance occurs between the discharge vortex 2 and the sound field of the heat exchanger from the heat exchange tube 1, the maximum sound absorbing effect can be obtained by the sound absorbing materials 3a and 3b.
本発明では、吸音材を、熱交換器の壁面から内方へ熱
交換器内の音場の共鳴音波長の1/4だけ間隔を隔てゝガ
スの流れ方向、かつ、熱交換管の軸方向に設置している
ために、熱交換管からの放出渦と熱交換器内音場の共鳴
が発生しても、吸音材によって最大の吸音効果が得られ
共鳴の振幅を小さくすることができる。In the present invention, the sound absorbing material is spaced inward from the wall surface of the heat exchanger by 1/4 of the resonance wavelength of the sound field in the heat exchanger in the gas flow direction and in the axial direction of the heat exchange tube. Therefore, even if resonance occurs between the vortex emitted from the heat exchange tube and the sound field in the heat exchanger, the maximum sound absorbing effect can be obtained by the sound absorbing material, and the amplitude of the resonance can be reduced.
第１図は本発明の一実施例に係る熱交換器の断面図、第
２図は従来の熱交換器の断面図である。 １……熱交換管、２……熱交換管の放出渦、3a,3b……
吸音材、５……熱交換器の側壁。FIG. 1 is a sectional view of a heat exchanger according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional heat exchanger. 1 ... heat exchange tube, 2 ... discharge vortex of heat exchange tube, 3a, 3b ...
Sound absorbing material, 5 ... Side wall of heat exchanger.
Claims (1)
をなして配置された複数の熱交換管からなる管群を内蔵
した熱交換器において、同熱交換器内の音場の共鳴音波
長の1/4だけ熱交換器の壁面から熱交換器の内方へ間隔
を隔てゝ、ガス流れ方向、かつ、熱交換管の軸方向に吸
音材を設置したことを特徴とする熱交換器。1. A heat exchanger incorporating a tube group consisting of a plurality of heat exchange tubes arranged in a direction perpendicular to a gas flow and parallel to each other, wherein a resonance acoustic wave of a sound field in the heat exchanger is provided. A heat exchanger characterized in that sound absorbers are installed in the gas flow direction and in the axial direction of the heat exchange tube at a distance of 1/4 of the length from the wall of the heat exchanger to the inside of the heat exchanger. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2193036A JP2713647B2 (en) | 1990-07-23 | 1990-07-23 | Heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2193036A JP2713647B2 (en) | 1990-07-23 | 1990-07-23 | Heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0480596A JPH0480596A (en) | 1992-03-13 |
| JP2713647B2 true JP2713647B2 (en) | 1998-02-16 |
Family
ID=16301100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2193036A Expired - Fee Related JP2713647B2 (en) | 1990-07-23 | 1990-07-23 | Heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2713647B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1450107A4 (en) | 2001-11-27 | 2009-05-20 | Mitsubishi Chem Functional Pro | Foldable heat radiating sheet |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5846986U (en) * | 1981-09-22 | 1983-03-30 | 三菱重工業株式会社 | Shell-and-tube heat exchanger |
| JPH0245363U (en) * | 1988-09-22 | 1990-03-28 |
-
1990
- 1990-07-23 JP JP2193036A patent/JP2713647B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0480596A (en) | 1992-03-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |