JPH032274B2 - - Google Patents
Info
- Publication number
- JPH032274B2 JPH032274B2 JP57111439A JP11143982A JPH032274B2 JP H032274 B2 JPH032274 B2 JP H032274B2 JP 57111439 A JP57111439 A JP 57111439A JP 11143982 A JP11143982 A JP 11143982A JP H032274 B2 JPH032274 B2 JP H032274B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- diameter
- tube
- steel pipe
- stainless steel
- 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 - Lifetime
Links
Classifications
-
- G—PHYSICS
- G12—INSTRUMENT DETAILS
- G12B—CONSTRUCTIONAL DETAILS OF INSTRUMENTS, OR COMPARABLE DETAILS OF OTHER APPARATUS, NOT OTHERWISE PROVIDED FOR
- G12B1/00—Sensitive elements capable of producing movement or displacement for purposes not limited to measurement; Associated transmission mechanisms therefor
- G12B1/04—Hollow bodies having parts which are deformable or displaceable under pressure, e.g. Bourdon tube, bellows
Landscapes
- Details Of Measuring And Other Instruments (AREA)
Description
【発明の詳細な説明】
本発明は温度検出用パワーエレメントの製造方
法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a power element for temperature detection.
例えば、温水ボイラ、湯沸器等において、湯温
によつてバーナの発停を制御する等の場合、パワ
ーエレメント感温部を直接缶の中に浸漬して湯温
を捉えることが行なわれる。 For example, in hot water boilers, water heaters, etc., when starting and stopping a burner is to be controlled based on the water temperature, the temperature of the water is measured by directly immersing the power element's temperature-sensing section into the can.
この種のパワーエレメント感温部にあつては、
その後端にベローズ等に至る細管が接続され、ま
たその先端は例えば次のようにして封止されてい
る。 For this type of power element temperature sensing part,
A thin tube leading to a bellows or the like is connected to the rear end, and the tip thereof is sealed, for example, as follows.
先端をスエージング加工した後偏平状に圧潰
してろう付けする。 After swaging the tip, it is crushed into a flat shape and brazed.
先端をスエージング加工した後偏平状に圧潰
してスポツト溶接する。 After swaging the tip, it is crushed into a flat shape and spot welded.
先端をスエージング加工した後溶融する。 The tip is swaged and then melted.
先端にキヤツプをかぶせろう付けする。 Cover the tip with a cap and braze it.
しかしながら、上記パワーエレメント感温部に
よれば、その先端を封止するのにスエージング加
工しているので（，，の場合）、コストが
かかり、またろう付けしているので（，の場
合）、母材とろう材との異種金属による局部電池
を構成して電気化学的腐食を受け、ピンホール等
を生成し、他の部分は異常がないのに感温部ろう
付部の腐食によつて制御装置が使用不能に至る事
故が起こる等の問題がある。 However, according to the above-mentioned power element temperature-sensing section, swaging is performed to seal the tip (in the case of , ), which is costly, and brazing is required (in the case of , ). , the base metal and the brazing metal constitute a local battery made of dissimilar metals, which undergoes electrochemical corrosion, producing pinholes, etc., and corrosion of the brazed part of the temperature sensing part, even though other parts are normal. However, there are problems such as accidents that may cause the control device to become unusable.
なお、スポツト溶接の場合にも、ガスリークす
るおそれがあり、信頼性に欠ける。 Incidentally, even in the case of spot welding, there is a risk of gas leakage and reliability is lacking.
本発明は上記事情に鑑みてなされたもので、そ
の目的とするところは、スエージング加工をした
りろう付けしたりせず、コストが安く、腐食等の
おそれがなく信頼性のある温度検出用パワーエレ
メントの製造方法を提供することである。 The present invention was made in view of the above circumstances, and its purpose is to provide a reliable temperature detection device that does not require swaging or brazing, is inexpensive, has no fear of corrosion, etc. An object of the present invention is to provide a method for manufacturing a power element.
以下本発明の一実施例を図面を参照して説明す
る。 An embodiment of the present invention will be described below with reference to the drawings.
第１図ａは本発明の封止構造の一例を示す部分
断面図である。図中符号１は感温筒で、ステンレ
スパイプからなり、その後端は第２図に示すよう
にスエージング加工が２回施されて縮径されてい
て、図示しないがベローズ等に至るキヤピラリチ
ユーブが接続されるようになつている。 FIG. 1a is a partial sectional view showing an example of the sealing structure of the present invention. Reference numeral 1 in the figure is a temperature-sensitive tube, which is made of a stainless steel pipe, and its rear end is swaged twice to reduce its diameter as shown in Figure 2, and is a capillary tube that connects to a bellows, etc. (not shown). are now connected.
一方、感温筒１の先端部は感温筒１の直径D1
とほぼ等しい直径D2を有する断面半円弧状に圧
潰されている（第１図ｂ参照）。この圧潰部２は
アルゴン溶接等により融着して封止されている。 On the other hand, the tip of the temperature sensing cylinder 1 has a diameter D 1 of the temperature sensing cylinder 1.
It is crushed into a semicircular cross-section with a diameter D 2 approximately equal to (see Fig. 1b). This crushed portion 2 is fused and sealed by argon welding or the like.
従つて、感温筒１を液中に浸漬しても、封止部
７は異種金属による局部電池を構成しないので、
電気化学的腐食を受けない。また、スポツト溶接
のようにガスリークのおそれもない。 Therefore, even if the thermosensor cylinder 1 is immersed in a liquid, the sealing part 7 does not constitute a local battery made of dissimilar metals.
Not subject to electrochemical corrosion. Also, unlike spot welding, there is no risk of gas leaks.
第２図ａ乃至ｄは本発明の温度検出用パワーエ
レメントの製造方法の一例を示している。 FIGS. 2a to 2d show an example of a method for manufacturing a power element for temperature detection according to the present invention.
まず、第２図ａに示すように、感温筒１を構成
するステンレスパイプＳを熱処理しておく。次い
で同図ｂに示ようにステンレスパイプＳの一端
（感温筒１の後端となる部分）をスエージング加
工して縮径する。そして、このスエージング加工
時の加工硬化を除くため熱処理し、同図ｃに示す
ようにステンレスパイプＳの一端を再度スエージ
ング加工して該一端に接続されるキヤピラリチユ
ーブの径に合うように縮径する。 First, as shown in FIG. 2a, the stainless steel pipe S constituting the temperature-sensitive cylinder 1 is heat-treated. Next, as shown in Figure b, one end of the stainless steel pipe S (the rear end of the temperature sensing tube 1) is swaged to reduce its diameter. Then, heat treatment is performed to remove work hardening during this swaging process, and one end of the stainless steel pipe S is swaged again to match the diameter of the capillary tube connected to the one end, as shown in Figure c. Reduce diameter.
次いで、上記ステンレスパイプＳの他端開口部
を本発明の製造方法により封止するが、これには
第３図に示すようなプレス装置３を使用する。こ
のプレス装置３は、感温筒１の直径D1（ステンレ
スパイプＳの直径）とほぼ等しい直径D3を有す
る断面半円形状の凹部４ａが形成された金型４
と、感温筒１の直径D1からその肉厚（ステンレ
スパイプＳの肉厚）を差し引いた直径D1−2t1と
ほぼ等しい直径D4を有する断面半円形状の凸部
５ａが形成された金型５とから構成されている。 Next, the opening at the other end of the stainless steel pipe S is sealed by the manufacturing method of the present invention, using a press device 3 as shown in FIG. 3. This press device 3 includes a mold 4 in which a recess 4a having a semicircular cross section and a diameter D 3 that is approximately equal to the diameter D 1 of the temperature-sensitive tube 1 (the diameter of the stainless steel pipe S) is formed.
Then, a convex portion 5a having a semicircular cross section is formed and has a diameter D 4 approximately equal to the diameter D 1 −2t 1 obtained by subtracting the wall thickness (thickness of the stainless steel pipe S) from the diameter D 1 of the temperature sensing cylinder 1. It consists of a mold 5.
封止するには、まずステンレスパイプＳの他端
（感温筒１の先端となる部分）を金型４の凹部４
ａ内にセツトし、次いで金型５の凸部５ａでステ
ンレスパイプＳの他端の外周面を押圧してこれを
圧潰する。これにより、ステンレスパイプＳの他
端がステンレスパイプＳの直径とほぼ等しい直径
を有する断面半円弧状に形成される。その後、こ
の圧潰部２をアルゴン溶接、レーザビーム溶接等
の溶接手段で融着して封止する。然る後、熱処理
して加工硬化を除く。 To seal, first place the other end of the stainless steel pipe S (the tip of the temperature sensing tube 1) into the recess 4 of the mold 4.
Then, the convex portion 5a of the mold 5 presses the outer peripheral surface of the other end of the stainless steel pipe S to crush it. As a result, the other end of the stainless steel pipe S is formed into a semicircular cross-section having a diameter that is approximately equal to the diameter of the stainless steel pipe S. Thereafter, this crushed portion 2 is fused and sealed by welding means such as argon welding or laser beam welding. After that, heat treatment is performed to remove work hardening.
上述の各工程における熱処理は、いずれも真空
炉で温度1030℃、時間60分加熱した後、窒素ガス
雰囲気中で急冷して行なう。 The heat treatment in each of the above steps is performed by heating in a vacuum furnace at a temperature of 1030° C. for 60 minutes, and then rapidly cooling in a nitrogen gas atmosphere.
上記実施例では、ステンレスパイプＳの一端の
みをスエージング加工するだけで、感温筒１の先
端部に相当するステンレスパイプＳの他端にはス
エージング加工を施していないので、ステンレス
パイプＳの両端をスエージング加工して感温筒１
を製造ずく従来の方法に比して加工コストを安く
することができる。 In the above embodiment, only one end of the stainless steel pipe S is swaged, and the other end of the stainless steel pipe S, which corresponds to the tip of the temperature sensing tube 1, is not swaged. Temperature sensing cylinder 1 with swaging on both ends
Processing costs can be reduced compared to conventional methods of manufacturing.
第４図はスエージング加工の他の実施例を示
し、感温部１の後端には２段階のテーパー状部２
a′，２b′を形成しつつ圧潰部２′が形成されてお
り、加工性を良くしつつ密封性の向上が図られて
いる。 FIG. 4 shows another embodiment of the swaging process.
A crushed portion 2' is formed while a' and 2b' are formed, thereby improving workability and sealing performance.
なお、本発明の封止構造は液中だけでなくアン
モニアガス等の腐食性ガス中でも何んら支障なく
使用できる。 The sealing structure of the present invention can be used not only in liquids but also in corrosive gases such as ammonia gas without any problems.
以上説明したように本発明によれば、感温部分
（感温筒）の先端部を封止するのに予めスエージ
ング加工をせずに、単に該先端部を感温部分の直
径とほぼ等しい直径を有する断面半円弧状に圧潰
して、この圧潰部分を融着により封止するだけな
ので、圧潰部分の接触面積が大きくなつて密閉度
の向上が図れると共に、コストがが安くなり、ま
たろう付け部分がないことから電気化学的腐食を
受けない。また、スポツト溶接のようにリークす
るおそれもない。従つて、信頼性を向上させるこ
とができる。 As explained above, according to the present invention, the tip of the temperature-sensitive portion (temperature-sensing tube) is simply sealed with a diameter approximately equal to the diameter of the temperature-sensing portion without performing swaging processing in advance. Since it is simply crushed into a semicircular cross-sectional shape with a diameter and the crushed portion is sealed by fusion, the contact area of the crushed portion is increased, improving the degree of sealing, reducing costs, and reducing the need for wax. Since there are no attached parts, it is not susceptible to electrochemical corrosion. Also, unlike spot welding, there is no risk of leakage. Therefore, reliability can be improved.
また、封止部分の寸法は感温部分の直径よりも
大きくならないので、缶体の取付孔から挿入して
設置するとき何んら支障がなく、また該取付孔を
必要以上に大きくしなくてもすむから感温部分と
取付孔との間のシールが容易に行なえる。 In addition, the dimensions of the sealing part are not larger than the diameter of the temperature-sensitive part, so there is no problem when installing it by inserting it through the mounting hole of the can, and there is no need to make the mounting hole larger than necessary. Since the temperature-sensitive part and the mounting hole can be easily sealed.
さらに、スエージング加工する場合に比して、
内容積が変わらないのに感温部分の長さ寸法を短
尺にできる。 Furthermore, compared to the case of swaging,
The length of the temperature sensing part can be shortened even though the internal volume remains the same.
さらにまた、封止するのに何んら特別な設備を
必要とせず、簡単なプレス装置だけですみ、設備
コストもかからない。 Furthermore, sealing does not require any special equipment; only a simple press device is required, and equipment costs are low.
第１図ａは本発明の封止構造の一実施例を示す
部分断面図、同図ｂは正面図、第２図ａ乃至ｄは
本発明の封止方法を適用した感温筒の製造方法を
説明する説明図、第３図は本発明の製造方法に使
用するプレス装置の略解図、第４図イは他の封止
構造を示す部分断面図、第４図ロは同上の平面図
である。
１…感温部分（感温筒）、２…圧潰部分、３…
プレス装置、４ａ…凹部、５ａ…凸部、４，５…
金型、７…封止部。
FIG. 1a is a partial sectional view showing an embodiment of the sealing structure of the present invention, FIG. FIG. 3 is a schematic illustration of a press device used in the manufacturing method of the present invention, FIG. 4 A is a partial sectional view showing another sealing structure, and FIG. 4 B is a plan view of the same. be. 1...Temperature sensing part (temperature sensing cylinder), 2...Crushing part, 3...
Press device, 4a... recess, 5a... protrusion, 4, 5...
Mold, 7... Sealing part.
Claims (1)
残してスエージング加工によりベローズ等と接続
されるキヤピラリチユーブを形成する工程と、 前記感温筒の直径と略等しい直径を有する断面
半円形状の凹部が形成された金型と、前記感温筒
の直径から肉厚を引いた直径と略等しい直径を有
する半円形状の凸部が形成された金型を具備した
プレス装置により、前記感温筒の先端部を該感温
筒の直径と略等しい直径を有する断面円弧状に圧
潰する工程と、 この圧潰部をアルゴン溶接、レーザビーム溶接
等の溶接手段で融着して封止する工程と、 とからなる温度検出用パワーエレメントの製造方
法。[Claims] 1. A step of forming a capillary tube to be connected to a bellows, etc. by swaging, leaving the temperature-sensitive tube, which is a large diameter portion of the stainless steel pipe, and having a diameter substantially equal to the diameter of the temperature-sensing tube. a mold in which a concave portion having a semicircular cross section is formed, and a mold in which a convex portion in a semicircular shape having a diameter substantially equal to the diameter of the temperature-sensitive tube minus the wall thickness is formed. A step of crushing the tip of the temperature-sensitive tube into an arcuate cross-sectional shape having a diameter approximately equal to the diameter of the temperature-sensing tube using a press device, and fusing the crushed portion with a welding method such as argon welding or laser beam welding. A method for manufacturing a power element for temperature detection, comprising: a step of sealing the temperature detection power element;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11143982A JPS593233A (en) | 1982-06-30 | 1982-06-30 | Construction and method for sealing up power element temperature sensing section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11143982A JPS593233A (en) | 1982-06-30 | 1982-06-30 | Construction and method for sealing up power element temperature sensing section |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS593233A JPS593233A (en) | 1984-01-09 |
| JPH032274B2 true JPH032274B2 (en) | 1991-01-14 |
Family
ID=14561224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11143982A Granted JPS593233A (en) | 1982-06-30 | 1982-06-30 | Construction and method for sealing up power element temperature sensing section |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS593233A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS612834A (en) * | 1984-06-15 | 1986-01-08 | オリンパス光学工業株式会社 | Exterior unit of endoscope and its production |
| JPS638952U (en) * | 1986-07-07 | 1988-01-21 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6013476B2 (en) * | 1978-09-04 | 1985-04-08 | 株式会社鷺宮製作所 | Manufacturing method of power element capillary sealing part |
-
1982
- 1982-06-30 JP JP11143982A patent/JPS593233A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS593233A (en) | 1984-01-09 |
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