JP3936322B2 - Fixed throttle in air micrometer - Google Patents

Fixed throttle in air micrometer Download PDF

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JP3936322B2
JP3936322B2 JP2003348315A JP2003348315A JP3936322B2 JP 3936322 B2 JP3936322 B2 JP 3936322B2 JP 2003348315 A JP2003348315 A JP 2003348315A JP 2003348315 A JP2003348315 A JP 2003348315A JP 3936322 B2 JP3936322 B2 JP 3936322B2
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air
throttle
air tube
forming member
peripheral surface
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JP2005114511A (en
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司 原
登 川上
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DAI-ICHI SOKUHAN WORKS CO.
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DAI-ICHI SOKUHAN WORKS CO.
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Description

本発明は、背圧式の空気マイクロメータにおける固定絞りに関するものである。   The present invention relates to a fixed throttle in a back pressure type air micrometer.

背圧式差圧方式の空気エアマイクロメータは、図１に示すようにエア噴出ノズル３と被測定面４との間隙にこのノズル３から噴出するエア流量の変化を固定絞り３によって生じる圧力変化として検出するように構成して、例えば図示していないが挿入測定ヘッドの周面にノズルを設け、ワークにこのヘッドを挿入してワークの内径を測定するように構成するが、絞り加減によって測定感度を変えることができる前記固定絞りは、従来エア管路となる金属製の継手部に金属製の絞り形成部材を組み込み設けている。   As shown in FIG. 1, the back-pressure type differential pressure type air-air micrometer uses a change in the air flow rate ejected from the nozzle 3 in the gap between the air ejection nozzle 3 and the measured surface 4 as a pressure change caused by the fixed throttle 3. For example, although not shown, a nozzle is provided on the circumferential surface of the insertion measurement head, and this head is inserted into the workpiece to measure the inner diameter of the workpiece. In the fixed throttle that can change the angle, a metal throttle forming member is incorporated and provided in a metal joint portion that is conventionally an air pipe.

即ち、例えばケーシングに設けたエア管路内に金属製の絞り部材を設け、このケーシングのエア管路出力端に隙間センサ側継手を設けると共に、入力端に空気源側継手を設けた構成としている。   That is, for example, a metal throttle member is provided in an air pipe provided in the casing, a gap sensor side joint is provided at the air pipe output end of the casing, and an air source side joint is provided at the input end. .

従って、この固定絞りをエア管路に設ける従来構造は、金属部材同志をシール性を確保して組み付けなければならないため、加工精度もかなり要求される上に、Ｏリング等の弾性シール材を併用しなければならない。そのため耐久性に劣り、また、弾性シール材が劣化してシール性が損なわれていてもこれに気づかず使用してしまう場合もある。   Therefore, the conventional structure in which this fixed restrictor is provided in the air pipe line requires that the metal members be assembled together while ensuring the sealing performance. Therefore, the processing accuracy is considerably required, and an elastic seal material such as an O-ring is used in combination. Must. Therefore, it is inferior in durability, and even if the elastic sealing material is deteriorated and the sealing performance is impaired, it may be used without noticing this.

従って、品質上の弱点を有し、また、製作においても組み付けにおいても容易ではなく、コスト高とならざるをえなかった。   Therefore, it has a weak point in quality, and it is not easy to manufacture and assemble, and it has to be expensive.

本発明は、このような現状に鑑み、エア管路にエアチューブを採用することに着眼し、このエアチューブ内に絞り形成部材を圧入挿入することで、簡易な構成でしかも簡単に固定絞りを所望な位置に設けることができ、しかも、圧入挿入がスムーズに行なえ、且つ上流側と下流側とのシール性が高く絞り機能が確実に果たせる固定絞りを容易に実現でき、更に例えば消耗時の交換や絞り調整のための別径の通気路を有する絞り形成部材への交換なども極めて容易に行なえ、特に精密部品が不要で部品点数が少なく、小型化が図れるなど極めて実用性に秀れた効果を発揮する画期的な空気マイクロメータにおける固定絞りを提供することを目的としている。   In view of such a current situation, the present invention focuses on adopting an air tube as an air pipe, and press-fitting and inserting a throttle forming member into the air tube allows a fixed throttle to be easily configured. It is possible to easily provide a fixed throttle that can be installed at a desired position, can be smoothly inserted into the press-fit, and has high sealing performance between the upstream side and the downstream side, and can reliably perform the throttle function. Also, it is very easy to change to a diaphragm forming member with a different diameter air passage for adjusting the throttle, and it is extremely practical because it requires no precision parts, reduces the number of parts, and can be downsized. It aims at providing the fixed aperture in the revolutionary air micrometer which exhibits.

添付図面を参照して本発明の要旨を説明する。   The gist of the present invention will be described with reference to the accompanying drawings.

背圧式の空気マイクロメータのエア管路１に設ける固定絞り２であって、エア噴出ノズル３と被測定面４との間隙にこのノズル３から噴出するエア流量の変化を前記固定絞り２によって生じる圧力変化として検出するように構成した背圧式の空気マイクロメータの少なくとも前記固定絞り２を設けるエア管路１を樹脂製のエアチューブ１Ａで構成し、このエアチューブ１Ａ内に所定径のエア通路２Ａを形成した絞り形成部材２Ｂを圧入挿入してエアチューブ１Ａ内に前記固定絞り２を設ける構成とし、この絞り形成部材２Ｂの外形状は、外周面がエアチューブ１Ａ内周面と略合致した球面状で外径寸法が前記エアチューブ１Ａ内径よりやや大きく、且つこのエアチューブ１Ａ挿入方向の外周面はこの挿入方向には球状湾曲せずにストレートな長さを有してエアチューブ１Ａ長さ方向内面に沿設する位置決め外周面２Ｃを有し前記エア通路２Ａ方向がエアチューブ長さ方向に沿った方向に位置決めされる構成としたことを特徴とする空気マイクロメータにおける固定絞りに係るものである。   The fixed throttle 2 is provided in the air pipe 1 of the back pressure type air micrometer, and the fixed throttle 2 causes a change in the flow rate of air ejected from the nozzle 3 in the gap between the air ejection nozzle 3 and the measured surface 4. An air pipe 1 provided with at least the fixed throttle 2 of a back pressure type air micrometer configured to detect a pressure change is constituted by a resin air tube 1A, and an air passage 2A having a predetermined diameter is formed in the air tube 1A. The fixed throttle 2 is provided in the air tube 1A by press-fitting the throttle forming member 2B formed with a squeeze, and the outer shape of the throttle forming member 2B is a spherical surface whose outer peripheral surface substantially coincides with the inner peripheral surface of the air tube 1A. The outer diameter of the air tube 1A is slightly larger than the inner diameter of the air tube 1A, and the outer peripheral surface of the air tube 1A is inserted straight without being curved in the insertion direction. The air tube 1A has a positioning outer peripheral surface 2C extending along the lengthwise inner surface, and the air passage 2A direction is positioned in a direction along the air tube length direction. This relates to a fixed aperture in an air micrometer.

また、前記エア通路２Ａを前記エアチューブ１Ａへの挿入方向に形成した前記絞り形成部材２Ｂの外形状は、外周面がエアチューブ１Ａ内周面と略合致した球面状で外径寸法が前記エアチューブ１Ａ内径よりやや大きく、且つエアチューブ１Ａへの挿入方向長は短尺で端縁はＲ面取りされて全体として球状に近い形状に設定したことを特徴とする請求項１記載の空気マイクロメータにおける固定絞りに係るものである。   Further, the outer shape of the diaphragm forming member 2B in which the air passage 2A is formed in the direction of insertion into the air tube 1A is a spherical shape whose outer peripheral surface is substantially coincident with the inner peripheral surface of the air tube 1A, and the outer diameter is the air. 2. The fixing in an air micrometer according to claim 1, wherein the length in the insertion direction into the air tube 1A is short and the end edge thereof is rounded to a shape close to a sphere as a whole. This relates to the aperture.

また、前記絞り形成部材２Ｂの外径に対して前記絞り形成部材２Ｂの前記エアチューブ１Ａへの挿入方向の長さが同等若しくはそれ以下の長さに設定したことを特徴とする請求項２記載の空気マイクロメータにおける固定絞りに係るものである。   The length in the insertion direction of the throttle forming member 2B into the air tube 1A is set to be equal to or less than the outer diameter of the throttle forming member 2B. This relates to a fixed aperture in an air micrometer.

また、前記絞り形成部材２Ｂの外周面の前記エアチューブ１Ａの内周面に沿った周方向に凸条部５を形成して絞り形成部材２Ｂの上流側と下流側とのシール性を向上させたことを特徴とする請求項１〜３のいずれか１項に記載の空気マイクロメータにおける固定絞りに係るものである。   Further, the protruding strips 5 are formed in the circumferential direction along the inner peripheral surface of the air tube 1A on the outer peripheral surface of the throttle forming member 2B to improve the sealing performance between the upstream side and the downstream side of the throttle forming member 2B. It concerns on the fixed aperture_diaphragm | restriction in the air micrometer of any one of Claims 1-3 characterized by the above-mentioned.

また、前記絞り形成部材２Ｂのエア通路２Ａの上流側開口部に、上流側程径大となるエア導入案内部６を形成して、下流側での圧力測定値の振動を抑制するように構成したことを特徴とする請求項１〜４のいずれか１項に記載の空気マイクロメータにおける固定絞りに係るものである。   Further, an air introduction guide portion 6 having a larger diameter on the upstream side is formed in the upstream side opening portion of the air passage 2A of the throttle forming member 2B so as to suppress the vibration of the pressure measurement value on the downstream side. The fixed aperture in the air micrometer according to any one of claims 1 to 4, wherein the fixed aperture is provided.

また、前記絞り形成部材２Ｂを前記エアチューブ１Ａの長さ方向に前記各エア通路２Ａが連通するよう複数直列に並設配設したことを特徴とする請求項１〜５のいずれか１項に記載の空気マイクロメータにおける固定絞りに係るものである。   6. The apparatus according to claim 1, wherein a plurality of the throttle forming members 2 </ b> B are arranged in series so that the air passages 2 </ b> A communicate with each other in the length direction of the air tube 1 </ b> A. This relates to the fixed throttle in the air micrometer described.

本発明は上述のように構成したから、エアチューブの柔軟性若しくは弾性を利用して挿入形成でき、しかも、このエアチューブの柔軟性若しくは弾性を利用して圧入挿入するため従来に比して精密部品が不要あるいは最小限に留めることができ、部品点数もわずかで十分なシール性を容易に確保できるため、簡易な構成でしかも簡単に固定絞りを所望な位置に設けることができ、またしかも、圧入挿入がスムーズに行なえ、且つ上流側と下流側とのシール性が高く絞り機能が確実に果たせる固定絞りを容易に実現でき、従って、例えば消耗時の交換や絞り調整のための別径の通気路を有する絞り形成部材への交換なども極めて容易に行なえる画期的な空気マイクロメータにおける固定絞りとなる。   Since the present invention is configured as described above, it can be inserted and formed by utilizing the flexibility or elasticity of the air tube, and moreover, it is press-fitted and inserted by utilizing the flexibility or elasticity of the air tube. Parts can be kept to a minimum or can be kept to a minimum, and since the number of parts is small and sufficient sealing performance can be easily secured, a fixed throttle can be easily provided at a desired position with a simple configuration. A fixed throttle that can perform press-fit insertion smoothly and has a high sealing performance between the upstream side and the downstream side and that can reliably perform the throttle function can be easily realized. It is an innovative fixed micrometer in an air micrometer that can be very easily replaced with a throttle forming member having a path.

また、請求項２，３記載の発明においては、一層挿入がスムーズでありながら位置決め外周面によってエア通路の向きは挿入時にズレることなく容易に設けることができる上、十分なシール性が確保でき、一層実用性に秀れた画期的な空気マイクロメータにおける固定絞りとなる。   Further, in the inventions of claims 2 and 3, the orientation of the air passage can be easily provided by the positioning outer peripheral surface without being displaced at the time of insertion while further smooth insertion, and sufficient sealing performance can be secured, This is a ground-breaking fixed air micrometer with excellent practicality.

また、請求項４記載の発明においては、更に上流側と下流側とのシール性が一層向上し、また、請求項５記載の発明においては、更に実質の絞り孔長を十分に短くして理想的な絞り機能を実現できると共に、下流側での圧力測定値の振動が抑制されるなど一層秀れた空気マイクロメータにおける固定絞りとなる。   Further, in the invention described in claim 4, the sealing performance between the upstream side and the downstream side is further improved, and in the invention described in claim 5, the substantial throttle hole length is further shortened to be ideal. This makes it possible to realize an effective throttling function and a more excellent fixed throttling in an air micrometer such as suppression of vibration of pressure measurement values on the downstream side.

また、請求項６記載の発明においては、複数個組み合わせることにより従来不可能であった等価的に感度の高い（オリフィス内径が小さい）固定絞りを作成することができ、例えばエア通路の内径が０.２ｍｍのものを精度良く製作することは不可能であったが内径０.３ｍｍのものを二個使うことにより代用可能であり、また分布常数回路となるため管路面積の急変が緩和され乱流の発生が少なくなり、その結果圧力が安定し、測定精度が向上する。また固定絞り一個当たりの圧力降下が半減するため樹脂製チューブと固定絞り間のシール性が一層向上するなど極めて秀れた画期的な空気マイクロメータにおける固定絞りとなる。   Further, in the invention described in claim 6, by combining a plurality, it is possible to produce a fixed throttle that is equivalently high in sensitivity (small in the inner diameter of the orifice), which has been impossible in the past. For example, the inner diameter of the air passage is 0. Although it was impossible to manufacture a product with a precision of 0.2 mm, it can be substituted by using two with a diameter of 0.3 mm, and since a distributed constant circuit is used, sudden changes in the pipe area are alleviated and disturbed. Flow generation is reduced, resulting in a stable pressure and improved measurement accuracy. In addition, since the pressure drop per fixed throttle is reduced by half, the sealing performance between the resin tube and the fixed throttle is further improved.

好適と考える本発明の最良の形態（発明をどのように実施するのが最良か）を、図面に基づいて本発明の作用効果を示して簡単に説明する。   BEST MODE FOR CARRYING OUT THE INVENTION The best mode of the present invention considered to be suitable (how best to carry out the invention) will be briefly described with reference to the drawings showing the effects of the present invention.

エアチューブ１Ａ内にエア通路２Ａを形成した絞り形成部材２Ｂを圧入挿入し、所望の位置に絞り形成部材２Ｂを圧入配設することでエア管路１に固定絞り２を設ける。   The throttle forming member 2B having the air passage 2A formed in the air tube 1A is press-inserted, and the throttle forming member 2B is press-fitted and disposed at a desired position to provide the fixed throttle 2 in the air pipe 1.

この挿入に際して絞り形成部材２Ｂの挿入方向の外周面にこの挿入方向には球状湾曲せずにストレートな長さを有してエアチューブ１Ａ長さ方向内面に弾圧当接する位置決め外周面２Ｃを形成しているため、挿入時にこれを挿入ガイドとして圧入挿入できると共にエア通路２Ａの向きが変化せず前記エア通路２Ａ方向がエアチューブ長さ方向に沿った方向に常に位置決めされることとなる。しかも、この位置決め外周面２Ｃによって所定長さ範囲がエアチューブと密着するため、十分なシール性が確保されることとなる。   At the time of this insertion, a positioning outer peripheral surface 2C is formed on the outer peripheral surface in the insertion direction of the diaphragm forming member 2B, having a straight length without being spherically curved in this insertion direction, and elastically contacting the inner surface in the length direction of the air tube 1A. Therefore, it can be press-fitted and inserted as an insertion guide during insertion, and the direction of the air passage 2A does not change, and the direction of the air passage 2A is always positioned in the direction along the length of the air tube. In addition, since the predetermined length range is in close contact with the air tube by the positioning outer peripheral surface 2C, sufficient sealing performance is ensured.

このように、本発明では、安価に入手可能な柔軟性あるいは弾性を有するエアチューブ１Ａを利用してこの中にエア通路２Ａを有する絞り形成部材２Ｂを圧入挿入する構成によって、従来のように精密部品を必要最小限に留めることができ、製作が容易でしかも十分なシール性が耐久性よく確保される画期的な固定絞りを実現でき、更に前記位置決め外周面２Ｃによって圧入挿入時の位置ズレもなくシール性も格段に向上する画期的な空気マイクロメータにおける固定絞りとなる。   As described above, in the present invention, by using the flexible or elastic air tube 1A that can be obtained at low cost, the throttle forming member 2B having the air passage 2A is press-inserted into the air tube 1A. It is possible to keep the parts to the minimum necessary, realize an epoch-making fixed throttle that is easy to manufacture and secures a sufficient sealing performance with durability, and further, the positioning outer peripheral surface 2C causes a displacement in press-fitting insertion. In addition, it becomes a fixed throttle in an epoch-making air micrometer in which the sealing performance is remarkably improved.

更に、例えばエアチューブ１Ａを透明なものとすれば中が見え、シール性も常に確認でき、また、これを自由に屈曲されることで、スペースを利用して配管でき、例えば入出方向を同方向にすることも可能でスペースの有効利用や小型化を一層容易に実現できることになる。   Furthermore, for example, if the air tube 1A is made transparent, the inside can be seen and the sealing performance can be confirmed at all times, and it can be bent freely so that piping can be made using a space. Therefore, it is possible to more effectively realize effective use of space and downsizing.

また、更に絞り形成部材２Ｂのエアチューブ１Ａへの挿入方向長を短尺として少なくとも挿入側端縁をＲ面取りして全体として球状に近い構成とすれば（例えば絞り形成部材２Ｂの外径に対して挿入方向長の長さを同等若しくはそれ以下として短尺とし、全体として球状に近い形状とすれば）、シール性が十分となるようにきつい圧入条件（径大な外径寸法に設定する）としつつもエアチューブ１Ａが樹脂製で柔軟性や弾性を有することとあいまって一層挿入がスムーズに行なわれ、所望の位置に容易に挿入配設固定できることとなる。   Further, if the length in the insertion direction of the aperture forming member 2B into the air tube 1A is short and at least the insertion side edge is chamfered to have a substantially spherical shape as a whole (for example, the outer diameter of the aperture forming member 2B (If the length in the insertion direction is the same or less and the length is short and the shape is nearly spherical as a whole), the tight press-fit conditions (set to a large outer diameter) are used to ensure sufficient sealing. In addition, the air tube 1A is made of resin and has flexibility and elasticity, so that the insertion can be performed more smoothly and can be easily inserted and fixed at a desired position.

また、更に、前記絞り形成部材２Ｂの外周面の前記エアチューブ１Ａの内周面に沿った周方向に凸条部５を形成すれば、エアチューブ１Ａの柔軟性や弾性によって依然としてスムーズに挿入可能であり、しかも前記位置決め外周面２Ｃの密着と共にあるいはこれに代えてこの凸条部５が内周方向でエアチューブ１Ａの内周面に強固に弾圧密着して、絞り形成部材２Ｂの上流側と下流側とのシール性は一層向上し、各種圧力の空気マイクロメータに適用可能となる。   Furthermore, if the convex strip 5 is formed in the circumferential direction along the inner peripheral surface of the air tube 1A on the outer peripheral surface of the aperture forming member 2B, it can still be inserted smoothly due to the flexibility and elasticity of the air tube 1A. In addition, together with or in close contact with the positioning outer peripheral surface 2C, the ridges 5 are firmly elastically pressed against the inner peripheral surface of the air tube 1A in the inner peripheral direction, and the upstream side of the throttle forming member 2B. The sealing performance with the downstream side is further improved, and it can be applied to an air micrometer with various pressures.

また、前記絞り形成部材２Ｂのエア通路２Ａの上流側開口部に、上流側程径大となるエア導入案内部６を形成すれば、エア通路２Ａの絞り実質長を理想的に短くしながらもこの絞りへのエア導入がスムーズとなり、下流側での圧力測定値の振動が抑制される。   Further, if the air introduction guide portion 6 having a larger diameter on the upstream side is formed in the upstream side opening portion of the air passage 2A of the throttle forming member 2B, while the effective length of the throttle of the air passage 2A is ideally shortened. The introduction of air into the throttle becomes smooth, and the vibration of the pressure measurement value on the downstream side is suppressed.

また、前記絞り形成部材２Ｂを前記エアチューブ１Ａの長さ方向に前記各エア通路２Ａが連通するよう複数直列に並設配設することが容易に行え、このように複数個並設することで、従来不可能であった等価的に感度の高い（オリフィス内径が小さい）固定絞りを作成することができる。例えばエア通路２Ａの内径が０.２ｍｍのものを精度良く製作することは不可能であったが、エア通路２Ａの内径が０.３ｍｍの絞り形成部材２Ｂを夫々のエア通路２Ａが連通するようにして挿入配設することで代用可能である。また、分布常数回路となるため管路面積の急変が緩和され乱流の発生が少なくなり、その結果圧力が安定し、測定精度が向上する。しかも固定絞り一個当たりの圧力降下が半減するため樹脂製チューブと固定絞り間のシール性が一層向上することになる。   In addition, a plurality of the throttle forming members 2B can be easily arranged in series so that the air passages 2A communicate with each other in the length direction of the air tube 1A. Thus, it is possible to produce a fixed throttle which is equivalently high in sensitivity (small in the orifice inner diameter), which has been impossible in the past. For example, although it was impossible to manufacture an air passage 2A having an inner diameter of 0.2 mm with high accuracy, each air passage 2A communicates with a throttle forming member 2B having an inner diameter of 0.3 mm. It is possible to substitute by inserting and arranging. In addition, since it is a distributed constant circuit, sudden changes in the pipe area are alleviated and turbulence is reduced, resulting in stable pressure and improved measurement accuracy. In addition, since the pressure drop per fixed throttle is halved, the sealing performance between the resin tube and the fixed throttle is further improved.

本発明の具体的な実施例１について図面に基づいて説明する。   A first embodiment of the present invention will be described with reference to the drawings.

本実施例の空気マイクロメータは図１に示す背圧式差圧方式を採用し、ここでの固定絞りは、空気マイクロメータの隙間センサー部（ノズル）と空気源を結ぶ管路に組み込まれるオリフィスである。空気源から供給され、この固定絞り３を経て隙間センサー部（ノズル３）と被測定物４との隙間より噴出する空気は、図２に示すようにその間隙の大小に応じて一定の範囲において比例的に変化する。本実施例の空気マイクロメータはこの流量の変化を固定絞り３によって生ずる圧力変化として検出するものである。   The air micrometer of this embodiment adopts the back pressure type differential pressure system shown in FIG. 1, and the fixed throttle here is an orifice incorporated in a pipe line connecting a gap sensor part (nozzle) of the air micrometer and an air source. is there. Air supplied from an air source and ejected from the gap between the gap sensor unit (nozzle 3) and the object to be measured 4 through the fixed throttle 3 is in a certain range according to the size of the gap as shown in FIG. Proportionally changes. The air micrometer of this embodiment detects this change in flow rate as a pressure change caused by the fixed throttle 3.

即ち、図２に示すように、本実施例の空気マイクロメータでは、ＰＡのカーブは固定絞りＡの絞り内径（絞り部材２Ｂのエア通路２Ａの内径）によって変化する。この固定絞りＡの絞り内径が小さいほどカーブが急峻になる（感度が高くなる。）。空気マイクロメータはこのリニア範囲において所定の精度を得ることができる。   That is, as shown in FIG. 2, in the air micrometer of the present embodiment, the curve of PA varies depending on the inner diameter of the fixed throttle A (the inner diameter of the air passage 2A of the throttle member 2B). The smaller the inner diameter of the fixed diaphragm A, the steeper the curve (the higher the sensitivity). The air micrometer can obtain a predetermined accuracy in this linear range.

また、ＰＢは固定絞りＣにより一定にする。この時空気源圧力がΔＰ０変化変動するとカーブは点線のように変化する。つまり同一隙間に対してＰＡがΔＰＡ変化するためこのままでは隙間測定値にΔＨの誤差を発生する。   Further, PB is made constant by a fixed aperture C. At this time, when the air source pressure changes by ΔP0, the curve changes as indicated by a dotted line. That is, since PA changes by ΔPA with respect to the same gap, an error of ΔH is generated in the gap measurement value as it is.

この誤差を取り除くため差圧方式として大気へ噴出する回路を追加し、ＰＡ-ＰＢを検出する方法としている。ＰＡ-ＰＢの曲線は図２のようにΔＰの影響が除去されている。   In order to remove this error, a circuit for jetting into the atmosphere is added as a differential pressure method to detect PA-PB. The PA-PB curve has the effect of ΔP removed as shown in FIG.

本実施例は、このような背圧式の差圧方式の空気マイクロメータの各固定絞りＡ，Ｂ，Ｃのいずれかあるいはすべてを以下のように構成する。   In the present embodiment, any or all of the fixed throttles A, B, and C of the back pressure type differential pressure type air micrometer are configured as follows.

図３に示すように、前記固定絞り２を設けるエア管路１を、屈曲自在で圧入挿入する絞り形成部材２Ｂに弾圧密着する弾性を有する樹脂製の透明なエアチューブ１Ａ（例えば管状のポリウレタンチューブ）で構成し、このエアチューブ１Ａ内に所定径のエア通路２Ａを形成した絞り形成部材２Ｂを圧入挿入してエアチューブ１Ａ内に前記固定絞り２を設ける構成とし、一端には空気源側継手７を圧入連結し、他端にはセンサ側連結用継手部８と分岐継手部９とを有する三又継手を圧入連結している。このエアチューブ１Ａを装置内のスペースに納まるように自由に屈曲配設することもでき、Ｕ状に折り返し屈曲することで、入出側を同方向に配して装置構成することもでき、非常に実用的となる。   As shown in FIG. 3, a resin-made transparent air tube 1A (for example, a tubular polyurethane tube) having elasticity that is elastically brought into close contact with a throttle forming member 2B that is freely press-fitted into the air conduit 1 provided with the fixed throttle 2 is provided. ), A throttle forming member 2B having an air passage 2A having a predetermined diameter is press-inserted into the air tube 1A, and the fixed throttle 2 is provided in the air tube 1A. 7 is press-fitted and a three-way joint having a sensor-side coupling joint portion 8 and a branch joint portion 9 is press-fitted and connected to the other end. The air tube 1A can be freely bent so as to fit in the space in the apparatus, and the apparatus can be configured with the input and output sides arranged in the same direction by being folded back into a U shape. Be practical.

本実施例のこの絞り形成部材２Ｂの外形状は、外周面がエアチューブ１Ａ内周面と略合致した球面状で外径寸法が前記エアチューブ１Ａ内径よりやや大きくして圧入挿入する構成とする。また、エアチューブ１Ａへの挿入方向長は短尺で前後両端縁はＲ面取りされて全体として球状に近い形状としている。図４に示したものは、外径５ｍｍに対して挿入方向長３ｍｍとし、その前後縁をＲ面とりすることで、圧入挿入・挿脱がスムーズとなり、Ｒ面取りされた間の範囲の外周面の外径は同一としてこのＲ面取りされた間に挿入方向長にストレートな短い位置決め外周面２Ｃを形成している。   The outer shape of the diaphragm forming member 2B of the present embodiment has a spherical shape whose outer peripheral surface substantially matches the inner peripheral surface of the air tube 1A, and has an outer diameter dimension slightly larger than the inner diameter of the air tube 1A for press-fitting insertion. . Further, the length in the insertion direction to the air tube 1A is short, and both front and rear edges are rounded to form a nearly spherical shape as a whole. 4 has an insertion direction length of 3 mm with respect to an outer diameter of 5 mm, and its front and rear edges are rounded to facilitate smooth insertion and insertion / removal of the outer peripheral surface in the range between the rounded chamfers. While the outer diameter is the same, a short positioning outer peripheral surface 2C that is straight in the insertion direction length is formed while being rounded.

即ち、このエアチューブ１Ａ挿入方向の短尺な外周面は、周方向とは違って挿入方向には球状湾曲せずに、短いけれどもストレートな長さを有してエアチューブ１Ａ長さ方向内面にその範囲が弾圧面接する位置決め外周面２Ｃを有する外形状に形成し、圧入挿入がスムーズに行えながらも前記エア通路２Ａ方向がエアチューブ長さ方向に沿った方向に位置決めされ、且つ十分なシール性を確保できる構成としている。   That is, the short outer peripheral surface in the insertion direction of the air tube 1A is not spherically curved in the insertion direction, unlike the circumferential direction, and has a short but straight length on the inner surface in the longitudinal direction of the air tube 1A. The area is formed in an outer shape having a positioning outer peripheral surface 2C that is in contact with the elastic surface, and the direction of the air passage 2A is positioned in the direction along the length of the air tube while the press-fitting insertion can be performed smoothly and has a sufficient sealing property. The structure can be secured.

また、前記絞り形成部材２Ｂのエア通路２Ａの上流側開口部に、上流側程径大となるエア導入案内部６を形成している。即ち、絞り形成部材２Ｂの下流側に口径の小さな絞り機能を発揮する通気路２Ａを形成し、上流側をラッパ状（ラーパ状）にして開口側ほど孔径が大きくなるエア導入案内部６としての通気路２Ａを形成し、絞り機能を有する絞り実質長を理想的に短くしつつも導入側を奥細り状の誘いこみ孔形状として、下流側での圧力測定値の振動を抑制するように構成している。   Further, an air introduction guide portion 6 having a larger diameter on the upstream side is formed in the upstream side opening portion of the air passage 2A of the throttle forming member 2B. That is, the air passage 2A that exhibits a narrowing function with a small diameter is formed on the downstream side of the throttle forming member 2B, and the upstream side has a trumpet shape (rapper shape). The air passage 2A is formed, and the introduction side is made into a narrow-shaped induction hole shape while ideally shortening the actual length of the throttle having a throttling function, so that the vibration of the pressure measurement value on the downstream side is suppressed. is doing.

図５に示すように本実施例では前記実施例１での絞り形成部材２Ｂの短尺な外周面の前記エアチューブ１Ａの内周面に沿った周方向に凸条部５を一条形成して絞り形成部材２Ｂの上流側と下流側とのシール性を一層向上させた構成としている。   As shown in FIG. 5, in this embodiment, a single ridge 5 is formed in the circumferential direction along the inner peripheral surface of the air tube 1 </ b> A on the short outer peripheral surface of the throttle forming member 2 </ b> B in the first embodiment. The sealing property between the upstream side and the downstream side of the forming member 2B is further improved.

本実施例では、図６に示すように、前記絞り形成部材２Ｂを前記エアチューブ１Ａの長さ方向に前記各エア通路２Ａが連通するよう複数直列に並設配設した構成としている。従って、複数個にすることにより従来不可能であった等価的に感度の高い（オリフィス内径が小さい）固定絞りを作成することができる。例えば内径０.２ｍｍを精度良く製作することは不可能であったが内径０.３ｍｍを二個使うことにより代用可能である。分布常数回路となるため管路面積の急変が緩和され乱流の発生が少なくなり、その結果圧力が安定し、測定精度が向上する。固定絞り一個当たりの圧力降下が半減するため樹脂製チューブと固定絞り間のシール性が向上する。   In the present embodiment, as shown in FIG. 6, a plurality of the throttle forming members 2B are arranged in parallel so that the air passages 2A communicate with each other in the length direction of the air tube 1A. Therefore, by using a plurality, it is possible to create a fixed throttle which is equivalently high in sensitivity (small in the inner diameter of the orifice), which has been impossible in the past. For example, it was impossible to accurately produce an inner diameter of 0.2 mm, but it can be substituted by using two inner diameters of 0.3 mm. Since it is a distributed constant circuit, sudden changes in the pipe area are alleviated and turbulence is reduced, resulting in stable pressure and improved measurement accuracy. Since the pressure drop per fixed throttle is halved, the sealing performance between the resin tube and the fixed throttle is improved.

尚、本発明は、実施例１，２，３に限られるものではなく、各構成要件の具体的構成は適宜設計し得るものである。   The present invention is not limited to the first, second, and third embodiments, and the specific configuration of each component can be designed as appropriate.

本実施例の空気マイクロメータの概略構成説明図である。It is schematic structure explanatory drawing of the air micrometer of a present Example. 本実施例の空気マイクロメータの作用説明図である。It is operation | movement explanatory drawing of the air micrometer of a present Example. 本実施例の空気マイクロメータにおける固定絞りの使用状態を示す要部の説明図である。It is explanatory drawing of the principal part which shows the use condition of the fixed aperture in the air micrometer of a present Example. 本実施例（実施例１）の空気マイクロメータにおける固定絞りの拡大断面図である。It is an expanded sectional view of the fixed stop in the air micrometer of a present Example (Example 1). 本実施例（実施例２）の空気マイクロメータにおける固定絞りの拡大断面図である。It is an expanded sectional view of the fixed stop in the air micrometer of a present Example (Example 2). 本実施例（実施例３）の本実施例の空気マイクロメータにおける固定絞りの拡大断面図である。It is an expanded sectional view of the fixed aperture stop in the air micrometer of a present Example (Example 3).

符号の説明Explanation of symbols

１ エア管路
１Ａ エアチューブ
２ 固定絞り
２Ａ エア通路
２Ｂ 絞り形成部材
２Ｃ 位置決め外周面
３ エア噴出ノズル
４ 被測定面
５ 凸条部
６ エア導入案内部
DESCRIPTION OF SYMBOLS 1 Air pipe line 1A Air tube 2 Fixed throttle 2A Air passage 2B Restriction forming member 2C Positioning outer peripheral surface 3 Air ejection nozzle 4 Surface to be measured 5 Projection section 6 Air introduction guide section

Claims (6)

背圧式の空気マイクロメータのエア管路に設ける固定絞りであって、エア噴出ノズルと被測定面との間隙にこのノズルから噴出するエア流量の変化を前記固定絞りによって生じる圧力変化として検出するように構成した背圧式の空気マイクロメータの少なくとも前記固定絞りを設けるエア管路を樹脂製のエアチューブで構成し、このエアチューブ内に所定径のエア通路を形成した絞り形成部材を圧入挿入してエアチューブ内に前記固定絞りを設ける構成とし、この絞り形成部材の外形状は、外周面がエアチューブ内周面と略合致した球面状で外径寸法が前記エアチューブ内径よりやや大きく、且つこのエアチューブ挿入方向の外周面はこの挿入方向には球状湾曲せずにストレートな長さを有してエアチューブ長さ方向内面に沿設する位置決め外周面を有し前記エア通路方向がエアチューブ長さ方向に沿った方向に位置決めされる構成としたことを特徴とする空気マイクロメータにおける固定絞り。   A fixed throttle provided in an air line of a back pressure type air micrometer, and detecting a change in the air flow rate ejected from the nozzle in the gap between the air ejection nozzle and the surface to be measured as a pressure change caused by the fixed throttle. A back pressure type air micrometer configured as described above is configured such that at least the fixed throttle is provided with a resin air tube, and a throttle forming member having an air passage having a predetermined diameter is press-inserted into the air tube. The fixed throttle is provided in the air tube, and the outer shape of the throttle forming member is a spherical shape whose outer peripheral surface is substantially coincident with the inner peripheral surface of the air tube and whose outer diameter is slightly larger than the inner diameter of the air tube. The outer circumferential surface of the air tube insertion direction has a straight length without being spherically curved in this insertion direction, and is positioned along the inner surface of the air tube length direction. It said air passage direction has a peripheral surface fixed aperture at the air micrometer, characterized in that it has a structure which is positioned in a direction along the air tube length. 前記エア通路を前記エアチューブへの挿入方向に形成した前記絞り形成部材の外形状は、外周面がエアチューブ内周面と略合致した球面状で外径寸法が前記エアチューブ内径よりやや大きく、且つエアチューブへの挿入方向長は短尺で端縁はＲ面取りされて全体として球状に近い形状に設定したことを特徴とする請求項１記載の空気マイクロメータにおける固定絞り。   The outer shape of the diaphragm forming member in which the air passage is formed in the direction of insertion into the air tube is a spherical shape whose outer peripheral surface is substantially matched with the inner peripheral surface of the air tube, and the outer diameter is slightly larger than the inner diameter of the air tube, 2. A fixed aperture in an air micrometer according to claim 1, wherein the length in the direction of insertion into the air tube is short and the end edge thereof is rounded and has a substantially spherical shape as a whole. 前記絞り形成部材の外径に対して前記絞り形成部材の前記エアチューブへの挿入方向の長さが同等若しくはそれ以下の長さに設定したことを特徴とする請求項２記載の空気マイクロメータにおける固定絞り。   3. The air micrometer according to claim 2, wherein the length of the throttle forming member in the direction of insertion into the air tube is set equal to or less than the outer diameter of the throttle forming member. Fixed aperture. 前記絞り形成部材の外周面の前記エアチューブの内周面に沿った周方向に凸条部を形成して絞り形成部材の上流側と下流側とのシール性を向上させたことを特徴とする請求項１〜３のいずれか１項に記載の空気マイクロメータにおける固定絞り。   A convex strip is formed in the circumferential direction along the inner peripheral surface of the air tube on the outer peripheral surface of the throttle forming member to improve the sealing performance between the upstream side and the downstream side of the throttle forming member. The fixed aperture in the air micrometer according to any one of claims 1 to 3. 前記絞り形成部材のエア通路の上流側開口部に、上流側程径大となるエア導入案内部を形成して、下流側での圧力測定値の振動を抑制するように構成したことを特徴とする請求項１〜４のいずれか１項に記載の空気マイクロメータにおける固定絞り。   An air introduction guide portion having a larger diameter toward the upstream side is formed in the upstream side opening portion of the air passage of the throttle forming member, and the vibration of the pressure measurement value on the downstream side is suppressed. The fixed aperture in the air micrometer according to any one of claims 1 to 4. 前記絞り形成部材を前記エアチューブの長さ方向に前記各エア通路が連通するよう複数直列に並設配設したことを特徴とする請求項１〜５のいずれか１項に記載の空気マイクロメータにおける固定絞り。

6. The air micrometer according to claim 1, wherein a plurality of the throttle forming members are arranged in series so that the air passages communicate with each other in the length direction of the air tube. Fixed aperture at.

JP2003348315A 2003-10-07 2003-10-07 Fixed throttle in air micrometer Expired - Lifetime JP3936322B2 (en)

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