JP4916424B2 - Differential distributed sensor - Google Patents

Differential distributed sensor Download PDF

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JP4916424B2
JP4916424B2 JP2007310882A JP2007310882A JP4916424B2 JP 4916424 B2 JP4916424 B2 JP 4916424B2 JP 2007310882 A JP2007310882 A JP 2007310882A JP 2007310882 A JP2007310882 A JP 2007310882A JP 4916424 B2 JP4916424 B2 JP 4916424B2
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movable shaft
air
mounting hole
shaft
cock
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JP2009134571A (en
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博隆 亀石
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Nohmi Bosai Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
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    • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

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Description

本発明は、火災警戒区域にはりめぐらせた空気管の内部空気の熱による膨張を検出して火災発生を感知する差動式分布型感知器に係り、より詳しくは各種流通試験のために設けられた空気経路切換用の切換コックの構造の改良に関する。   The present invention relates to a differential distribution type sensor for detecting the occurrence of a fire by detecting the expansion of the air pipe inside the fire alarm area due to the heat of the air. More specifically, the present invention is provided for various distribution tests. The present invention relates to an improvement in the structure of a switching cock for switching an air path.

従来より、火災警戒区域にはりめぐらせた空気管の内部空気の熱による膨張を検出して火災発生を感知するようにした差動式分布型感知器は知られている（例えば、特許文献１参照）。このようなものにおいては、信頼性確保のため、各種の流通試験が必要である。そのため、差動式分布型感知器は、複数の空気通路とこれら空気通路に連通する取付孔を有するコック本体と、その空気通路を切り換えるための複数の通気路を有し前記取付孔に回動自在に挿着された可動軸と、からなる切換コックを備えている。そして、その切換コックによって空気の通路を切り換えることで、各種の流通試験を行えるようになっている。   2. Description of the Related Art Conventionally, there is known a differential distribution type sensor that detects the occurrence of a fire by detecting the expansion caused by the heat of the air inside an air pipe circulated in a fire warning area (for example, Patent Document 1). reference). In such a case, various distribution tests are required to ensure reliability. Therefore, the differential distributed sensor has a cock body having a plurality of air passages and attachment holes communicating with the air passages, and a plurality of air passages for switching the air passages, and is rotated to the attachment holes. A switching cock is provided that includes a movable shaft that is freely inserted and attached. And various switching tests can be performed by switching the air passage by the switching cock.

これを更に詳述するために図５及び図６を用いて従来技術について説明する。コック本体２には、火災警戒区域にはりめぐらせた空気管１Ａの両端が接続される第１及び第２の空気管用ノズルＰ１，Ｐ２を備えている。さらにコック本体２には、緩慢な温度変化に対して空気管内の空気圧を大気圧に合わせるためのリーク孔（オリフィス）Ｌと、検出用ノズルＦと、試験用ノズルＴとが設けられている。また、可動軸２ａを回動自在に取り付けるための円錐台状の取付孔が、第１及び第２の空気管用ノズルＰ１，Ｐ２とリーク孔Ｌと検出用ノズルＦと試験用ノズルＴとに連通させて設けられている。可動軸２ａは、取付孔の略全長に亘って密嵌状態かつ回動自在となるように取付孔と同様の円錐台状に形成されている。さらに可動軸２ａには、その回転操作によって各前記ノズルやリーク孔に選択的に連通接続可能となる複数の通気路６が形成されている。これにより、可動軸２ａを回転操作して通気路６を切り換えることで、各種の流通試験が行え、コック本体２の取付孔内周面と可動軸外周面との間の密閉性も確保できるようになっている。   In order to further explain this, the prior art will be described with reference to FIGS. The cock body 2 is provided with first and second air pipe nozzles P1 and P2 to which both ends of an air pipe 1A laid around the fire warning area are connected. Further, the cock body 2 is provided with a leak hole (orifice) L, a detection nozzle F, and a test nozzle T for adjusting the air pressure in the air pipe to the atmospheric pressure against a slow temperature change. A frustoconical mounting hole for rotatably mounting the movable shaft 2a communicates with the first and second air tube nozzles P1, P2, the leak hole L, the detection nozzle F, and the test nozzle T. Is provided. The movable shaft 2a is formed in the shape of a truncated cone similar to the mounting hole so as to be closely fitted and rotatable over substantially the entire length of the mounting hole. Further, the movable shaft 2a is formed with a plurality of air passages 6 that can be selectively connected to the nozzles and the leak holes by the rotation operation. Thereby, various circulation tests can be performed by rotating the movable shaft 2a and switching the air passage 6, and the sealing between the inner peripheral surface of the cock hole 2 and the outer peripheral surface of the movable shaft can be secured. It has become.

ここで、各種試験について説明する。各種試験には、（ａ）ポンプ試験、（ｂ）流通試験、（ｃ）ダイヤフラム試験、（ｄ）リーク試験の４つがある。   Here, various tests will be described. There are four types of tests: (a) pump test, (b) flow test, (c) diaphragm test, and (d) leak test.

ポンプ試験は、試験用ノズルＴに注射器等の試験ポンプＴＰを接続し、この状態で試験ポンプＴＰから試験用ノズルＴに作動空気圧に相当する空気を注入し、これによって検出用ノズルＦに接続されているダイヤフラム３が変位して接点４，５がオンとなるまでの作動時間と、復旧するまでの復旧時間を測定するものである。   In the pump test, a test pump TP such as a syringe is connected to the test nozzle T, and in this state, air corresponding to the working air pressure is injected from the test pump TP to the test nozzle T, thereby being connected to the detection nozzle F. The operating time until the diaphragm 3 is displaced and the contacts 4 and 5 are turned on, and the recovery time until recovery is measured.

流通試験は、試験用ノズルＴに試験ポンプＴＰを接続し、さらに空気管１Ａの他端にマノメータ等の圧力計Ｍを接続して、この状態で試験ポンプＴＰから試験用ノズルＴに所定の空気を注入するものである。このとき、空気管１Ａに接続された圧力計で所定の圧力が安定して測定できれば、この空気管１Ａから空気が漏れていないことになる。   In the flow test, a test pump TP is connected to the test nozzle T, and a pressure gauge M such as a manometer is connected to the other end of the air pipe 1A. In this state, a predetermined air is supplied from the test pump TP to the test nozzle T. Is to inject. At this time, if a predetermined pressure can be stably measured with a pressure gauge connected to the air pipe 1A, air does not leak from the air pipe 1A.

ダイヤフラム試験は、第１の空気管用ノズルＰ１に試験ポンプＴＰと圧力計Ｍを接続して、この状態で試験ポンプＴＰから第１の空気管用ノズルＰ１に徐々に空気を注入するものである。このとき、ダイヤフラム３が変位して接点４，５がオンとなるときの空気圧を圧力計Ｍで測定する。   In the diaphragm test, a test pump TP and a pressure gauge M are connected to the first air pipe nozzle P1, and air is gradually injected from the test pump TP into the first air pipe nozzle P1 in this state. At this time, the air pressure when the diaphragm 3 is displaced and the contacts 4 and 5 are turned on is measured by the pressure gauge M.

リーク試験は、第２の空気管用ノズルＰ２に試験ポンプＴＰと圧力計Ｍを接続して、この状態で試験ポンプＴＰから第２の空気管用ノズルＰ２に空気を注入するものである。このとき、リーク孔Ｌから空気が漏れて圧力が低下する速度を測定する。   In the leak test, a test pump TP and a pressure gauge M are connected to the second air pipe nozzle P2, and air is injected from the test pump TP to the second air pipe nozzle P2 in this state. At this time, the rate at which pressure leaks due to air leaking from the leak hole L is measured.

以上の試験の際には、可動軸２ａを回転させて各ノズルの空気経路と可動軸の通気路を切り換えて試験を行うようにしている。   In the above test, the test is performed by rotating the movable shaft 2a to switch the air path of each nozzle and the air passage of the movable shaft.

特開２００３−７７０７４号公報（図６，図７）Japanese Patent Laying-Open No. 2003-77074 (FIGS. 6 and 7)

ところで、切換コックを構成するコック本体および可動軸は、一般に黄銅製の切削品からなるため、切削加工時にバリ等の凹凸が生じ、所望の精度を得るのが難しい。このため、従来の差動式分布型感知器のように、円錐台状の取付孔や可動軸の略全長に亘って密閉性と高い精度が求められるものにあっては、生産性を上げることは難しい。また、取付孔と可動軸の密閉性を高めるために、可動軸の略全長に亘って潤滑剤を塗布する必要がある。しかし、可動軸に塗布した潤滑剤は、時間の経過と共に流れ出る等の問題がある。   By the way, since the cock main body and the movable shaft constituting the switching cock are generally made of a brass cut product, irregularities such as burrs are generated during the cutting process, and it is difficult to obtain a desired accuracy. For this reason, in the case where a sealing performance and high accuracy are required over substantially the entire length of the frustum-shaped mounting hole or the movable shaft, as in the conventional differential distribution type sensor, the productivity is increased. Is difficult. Moreover, in order to improve the sealing performance between the mounting hole and the movable shaft, it is necessary to apply a lubricant over substantially the entire length of the movable shaft. However, there is a problem that the lubricant applied to the movable shaft flows out over time.

本発明の技術的課題は、切削の際に切換コックの可動軸の摺動面に凹凸による不一致が生じる割合を減少させ、切換コックの生産性を向上させることができるようにすることにある。   The technical problem of the present invention is to reduce the proportion of unevenness caused by unevenness on the sliding surface of the movable shaft of the switching cock during cutting, and to improve the productivity of the switching cock.

本発明に係る差動式分布型感知器は、下記の構成からなるものである。すなわち、複数の空気通路とこれら空気通路に連通する取付孔を有するコック本体と、前記空気通路を切り換えるための複数の通気路を有し取付孔に回動自在に挿着された可動軸と、からなる切換コックを備えた差動式分布型感知器において、コック本体の取付孔を、円錐台状に形成するとともに、可動軸を、基本的に外径が円錐台状取付孔の小径部よりも小さくかつこの取付孔とほぼ同じ長さの円柱から形成し、円柱の軸方向中央部分は、外径が円柱の外径よりも大きくかつ外周面が取付孔の軸方向中央部分と密嵌可能な短尺のテーパ軸部に構成し、テーパ軸部に、前記空気通路に連通接続するための全ての通気路を配置したものである。   The differential distributed sensor according to the present invention has the following configuration. That is, a cock body having a plurality of air passages and attachment holes communicating with the air passages, a movable shaft having a plurality of air passages for switching the air passages and rotatably inserted into the attachment holes, In the differential distribution type sensor equipped with a switching cock, the mounting hole of the cock body is formed in a truncated cone shape, and the movable shaft is basically formed from the small diameter portion of the truncated cone mounting hole. Is formed from a cylinder that is almost the same length as this mounting hole, and the center part in the axial direction of the cylinder has an outer diameter larger than the outer diameter of the cylinder and the outer peripheral surface can be closely fitted with the center part in the axial direction of the mounting hole. It is constituted by a short taper shaft part, and all the air passages for communicating with the air passage are arranged on the taper shaft part.

また、可動軸のテーパ軸部の一端または他端の少なくとも一方の外周部に、弾性材を設置するための弧状溝を形成したものである。   Further, an arc-shaped groove for installing an elastic material is formed on at least one outer peripheral portion of one end or the other end of the tapered shaft portion of the movable shaft.

また、可動軸のテーパ軸部外周面における各通気路の開口部の周縁、又はコック本体の取付孔内面における各空気通路の開口部の周縁に、それぞれ弾性材を設置するための凹溝を形成したものである。   In addition, a groove for installing an elastic material is formed on the periphery of the opening of each air passage on the outer peripheral surface of the tapered shaft of the movable shaft or on the periphery of the opening of each air passage on the inner surface of the attachment hole of the cock body. It is a thing.

本発明に係る差動式分布型感知器においては、可動軸を、円柱に形成し、円柱の軸方向中央部分は、外径が円柱の外径よりも大きくかつ外周面が取付孔の軸方向中央部分と密嵌可能な短尺のテーパ軸部に構成し、テーパ軸部に、前記空気通路に連通接続するための全ての通気路を配置して、可動軸に空気通路の切換に必要な部分のみテーパ部を設けるようにしている。このため、切換コックの可動軸の摺動面となるテーパ軸部外周面の面積を小さくすることができる。従って、可動軸の摺動面（テーパ軸部外周面）に切削加工によるバリ等の凹凸が生じたとしても、その影響を小さくすることができる。つまり、可動軸の摺動面に凹凸による不一致が生じる割合を減少させることが可能となって、切換コックの生産性を向上させることができる。   In the differential distributed sensor according to the present invention, the movable shaft is formed in a cylinder, and the central portion in the axial direction of the cylinder has an outer diameter larger than the outer diameter of the cylinder and the outer peripheral surface is the axial direction of the mounting hole. A short taper shaft part that can be tightly fitted to the central part, all the air passages connected to the air passage are arranged in the taper shaft part, and a part necessary for switching the air passage on the movable shaft Only the tapered portion is provided. For this reason, the area of the outer peripheral surface of the taper shaft portion that becomes the sliding surface of the movable shaft of the switching cock can be reduced. Therefore, even if irregularities such as burrs are generated by cutting on the sliding surface of the movable shaft (taper shaft outer peripheral surface), the influence can be reduced. That is, it is possible to reduce the rate at which the unevenness due to the unevenness occurs on the sliding surface of the movable shaft, and the productivity of the switching cock can be improved.

また、可動軸のテーパ軸部の一端または他端の少なくとも一方の外周部に、弾性材を設置するための弧状溝を形成しているので、この弧状溝に例えばＯリング等の弾性材を設置すれば、摺動部に塗布した潤滑剤が時間の経過と共に流れ出ることを防ぐことができる。   In addition, since an arc-shaped groove for installing an elastic material is formed on at least one outer peripheral portion of one end or the other end of the tapered shaft portion of the movable shaft, an elastic material such as an O-ring is installed in this arc-shaped groove. If it does so, it can prevent that the lubricant apply | coated to the sliding part flows out with progress of time.

また、可動軸のテーパ軸部外周面における各通気路の開口部の周縁、又はコック本体の取付孔内面における各空気通路の開口部の周縁に、それぞれ弾性材を設置するための凹溝を形成している。そのため、摺動部の密閉性がより向上し、摺動部に塗布した潤滑剤が時間の経過と共に各通気路や各空気通路内に侵入して流れ出ることを防ぐことができる。   In addition, a groove for installing an elastic material is formed on the periphery of the opening of each air passage on the outer peripheral surface of the tapered shaft of the movable shaft or on the periphery of the opening of each air passage on the inner surface of the attachment hole of the cock body. is doing. Therefore, the sealing performance of the sliding portion is further improved, and the lubricant applied to the sliding portion can be prevented from entering and flowing out into each air passage and each air passage with the passage of time.

図１は本発明の一実施形態に係る差動式分布型感知器の切換コックの構成部材である可動軸と弾性材（Ｏリング）との関係を示す分解斜視図、図２はその可動軸に弾性材（Ｏリング）を装着した状態を示す断面図、図３はその切換コックの構成部材であるコック本体と可動軸との組付状態を示す斜視図、図４は図３のＡ−Ａ線矢視断面図である。   FIG. 1 is an exploded perspective view showing the relationship between a movable shaft, which is a component of a switching cock of a differential distributed sensor according to an embodiment of the present invention, and an elastic material (O-ring), and FIG. FIG. 3 is a perspective view showing the assembled state of the cock body, which is a component of the switching cock, and the movable shaft, and FIG. It is A line arrow sectional drawing.

本実施形態の差動式分布型感知器は、切換コック１が、コック本体１０と、可動軸２０とから構成されている。   In the differential distribution type sensor according to the present embodiment, the switching cock 1 includes a cock body 10 and a movable shaft 20.

これを更に詳述すると、コック本体１０には、図３及び図４のように火災警戒区域にはりめぐらせた空気管（図示せず）の両端が接続される第１及び第２の空気管用ノズル１１，１２と、緩慢な温度変化に対して空気管内の空気圧を大気圧に合わせるためのリーク孔（オリフィス）１３と、検出用ノズル１４と、試験用ノズル１５とが設けられている。また、可動軸２０を回動自在に取り付けるための円錐台状の取付孔１６が、第１及び第２の空気管用ノズル１１，１２とリーク孔１３と検出用ノズル１４と試験用ノズル１５とにそれぞれ独立した空気通路１７を介し連通させて設けられている。   More specifically, the cock body 10 is for first and second air pipes to which both ends of an air pipe (not shown) laid around a fire alarm area as shown in FIGS. 3 and 4 are connected. Nozzles 11 and 12, a leak hole (orifice) 13 for adjusting the air pressure in the air pipe to the atmospheric pressure against a slow temperature change, a detection nozzle 14, and a test nozzle 15 are provided. A frustoconical mounting hole 16 for rotatably mounting the movable shaft 20 is provided in the first and second air tube nozzles 11 and 12, the leak hole 13, the detection nozzle 14, and the test nozzle 15. They are provided in communication with each other via independent air passages 17.

可動軸２０は、図１乃至図４のように基本的に外径が円錐台状取付孔１６の小径部よりも小さくかつこの取付孔１６とほぼ同じ長さの円柱２１から形成されている。この円柱２１の軸方向中央部分は、その外径が円柱２１の外径よりも大きくかつ外周面（テーパ面）２２が取付孔１６の軸方向中央部分と密嵌可能かつ回動自在な短尺のテーパ軸部２３に構成されている。また、テーパ軸部２３には、コック本体１０の各空気通路１７と選択的に連通接続可能な複数の通気路２４を備えている。さらに、コック本体１０の軸方向に位置がずれている空気通路、例えば空気管用ノズル１１，１２とリーク孔１３の間、または空気管用ノズル１１，１２と検出用ノズル１４の間を選択的に連通接続可能な複数の長溝２５が設けられている。つまり、テーパ軸部２３には、コック本体１０側の各空気通路１７に選択的に連通接続するための全ての通気路２４が配置されている。   As shown in FIGS. 1 to 4, the movable shaft 20 is basically formed of a cylinder 21 having an outer diameter smaller than that of the small diameter portion of the frustoconical mounting hole 16 and substantially the same length as the mounting hole 16. The axial center portion of the cylinder 21 has a short outer diameter that is larger than the outer diameter of the cylinder 21 and whose outer peripheral surface (tapered surface) 22 can be closely fitted to the axial center portion of the mounting hole 16 and is rotatable. The taper shaft portion 23 is configured. Further, the tapered shaft portion 23 is provided with a plurality of air passages 24 that can be selectively connected to the air passages 17 of the cock body 10. Further, an air passage whose position is shifted in the axial direction of the cock body 10, for example, selectively communicates between the air pipe nozzles 11 and 12 and the leak hole 13 or between the air pipe nozzles 11 and 12 and the detection nozzle 14. A plurality of long grooves 25 that can be connected are provided. That is, all the air passages 24 for selectively communicating with the air passages 17 on the cock body 10 side are arranged in the taper shaft portion 23.

また、テーパ軸部２３には、その縮径側端（一端）の外周部と拡径側端（他端）の外周部に、それぞれ弾性材（例えばＯリング）を設置するための弧状溝２６，２７が形成されている。さらに、コック本体１０の取付孔１６にも弧状溝２６，２７と対向する部位に弧状溝１８，１９が形成されている。つまり、弧状溝２６と１８の間、及び弧状溝２７と１９の間に、それぞれＯリング３１，３２が挾持されるようになっている。   Further, in the tapered shaft portion 23, arc-shaped grooves 26 for installing elastic materials (for example, O-rings) on the outer peripheral portion of the reduced diameter side end (one end) and the outer peripheral portion of the enlarged diameter side end (other end), respectively. , 27 are formed. Further, arc-shaped grooves 18 and 19 are also formed in the mounting hole 16 of the cock body 10 at portions facing the arc-shaped grooves 26 and 27. That is, O-rings 31 and 32 are sandwiched between the arc-shaped grooves 26 and 18 and between the arc-shaped grooves 27 and 19, respectively.

更にまた、テーパ軸部２３には、図１及び図２のようにその外周面（テーパ面）２２における各通気路２４の開口部の周縁と各長溝２５の周縁に、それぞれ弾性材（例えばＯリング）を設置するための凹溝２８，２９が形成されていて、これら凹溝２８，２９内にＯリング３３，３４が設置されている。なお、可動軸２０の円柱２１におけるテーパ縮径側の端部には、図示しない操作レバーを取付固定するためのねじ穴２１ａが形成されており、ねじ穴２１ａに装着される操作レバーによって、回動操作されるようになっている。   Further, as shown in FIGS. 1 and 2, an elastic material (for example, O) is provided on the peripheral edge of each opening 24 and the peripheral edge of each long groove 25 on the outer peripheral surface (tapered surface) 22 as shown in FIGS. The concave grooves 28 and 29 for installing the ring) are formed, and the O-rings 33 and 34 are installed in the concave grooves 28 and 29. Note that a screw hole 21a for mounting and fixing an operation lever (not shown) is formed at the end of the movable shaft 20 on the tapered diameter reduction side of the cylinder 21. The operation lever attached to the screw hole 21a rotates the screw 21a. It is designed to be operated dynamically.

操作レバーは、これとコック本体１０の間に配置される図示しない付勢手段により、常時外方、つまり取付孔１６内のテーパ軸部２３に対してくさび効果が働く方向に付勢されている。そのため、Ｏリング３１，３２と共に可動軸２０を取付孔１６内の所定位置に弾性保持する機能を持っている。   The operating lever is always urged outwardly, that is, in a direction in which the wedge effect acts on the tapered shaft portion 23 in the mounting hole 16 by an urging means (not shown) disposed between the operation lever and the cock body 10. . Therefore, it has a function of elastically holding the movable shaft 20 at a predetermined position in the mounting hole 16 together with the O-rings 31 and 32.

次に、本実施形態の差動式分布型感知器の切換コック１を構成するコック本体１０と可動軸２０の組付手順について説明する。まず、可動軸２０のテーパ軸部２３の各凹溝２８，２９内に、それぞれＯリング３３，３４を装着する。次にテーパ軸部２３の縮径側の端部の弧状溝２６上に、Ｏリング３１を載置する。その後、テーパ軸部２３の拡径側の端部の弧状溝２７にＯリング３２を押し付けた状態で、可動軸２０をねじ穴２１ａ側が先端となるように取付孔１６内に挿入する。最後に、Ｏリング３１，３２が取付孔１６の弧状溝１８，１９内に嵌り込むまで可動軸２０を押し込む。これにより、Ｏリング３１，３２が弧状溝２６と１８の間、及び弧状溝２７と１９の間に、それぞれ挾持され、テーパ軸部２３すなわち可動軸２０が、Ｏリング３１，３２を介して取付孔１６内の所定位置に弾性保持される。   Next, the assembly procedure of the cock main body 10 and the movable shaft 20 constituting the switching cock 1 of the differential distribution type sensor of the present embodiment will be described. First, O-rings 33 and 34 are mounted in the respective concave grooves 28 and 29 of the tapered shaft portion 23 of the movable shaft 20. Next, the O-ring 31 is placed on the arc-shaped groove 26 at the end of the tapered shaft portion 23 on the reduced diameter side. Thereafter, in a state where the O-ring 32 is pressed against the arc-shaped groove 27 at the end of the taper shaft portion 23 on the diameter increasing side, the movable shaft 20 is inserted into the mounting hole 16 so that the screw hole 21a side is the tip. Finally, the movable shaft 20 is pushed in until the O-rings 31 and 32 are fitted in the arc-shaped grooves 18 and 19 of the mounting hole 16. Accordingly, the O-rings 31 and 32 are held between the arc-shaped grooves 26 and 18 and between the arc-shaped grooves 27 and 19, respectively, and the tapered shaft portion 23, that is, the movable shaft 20 is attached via the O-rings 31 and 32. It is elastically held at a predetermined position in the hole 16.

次いで、可動軸２０のねじ穴２１ａに操作レバー（図示せず）を装着固定する。これにより、コック本体１０と可動軸２０の組付が完了する。   Next, an operation lever (not shown) is mounted and fixed in the screw hole 21 a of the movable shaft 20. Thereby, the assembly of the cock body 10 and the movable shaft 20 is completed.

このように、本実施形態の差動式分布型感知器においては、取付孔１６の軸方向中央部分と密嵌可能な短尺のテーパ軸部２３に構成し、テーパ軸部２３に、空気通路１７に連通接続するための全ての通気路２４を配置して、可動軸２０に空気通路１７の切換に必要な部分のみテーパ部を設けるようにした。そのため、切換コック１の可動軸２０の摺動面となるテーパ軸部外周面２２の面積を小さくすることができる。従って、可動軸２０のテーパ軸部外周面２２に切削加工によるバリ等の凹凸が生じたとしても、その影響を小さくすることができる。この結果、可動軸２０のテーパ軸部外周面２２に凹凸による不一致が生じる割合を減少させることが可能となって、切換コック１の生産性を向上させることができる。なお、可動軸の軸心部分は必ずしも円柱にする必要はなく、例えば角柱やその他の断面多角形状の柱としてもよいことは言うまでもない。   Thus, in the differential distribution type sensor of the present embodiment, the short tapered shaft portion 23 that can be tightly fitted to the axial center portion of the mounting hole 16 is configured, and the air passage 17 is formed in the tapered shaft portion 23. All the air passages 24 for communication connection are arranged, and only a portion necessary for switching the air passage 17 is provided on the movable shaft 20. Therefore, the area of the taper shaft outer peripheral surface 22 that becomes the sliding surface of the movable shaft 20 of the switching cock 1 can be reduced. Therefore, even if irregularities such as burrs are generated by cutting on the outer peripheral surface 22 of the tapered shaft portion of the movable shaft 20, the influence can be reduced. As a result, it is possible to reduce the rate at which the unevenness due to the unevenness occurs on the tapered shaft outer peripheral surface 22 of the movable shaft 20, and the productivity of the switching cock 1 can be improved. Needless to say, the axial center portion of the movable shaft does not necessarily have to be a cylinder, and may be, for example, a prism or other polygonal section.

また、可動軸２０のテーパ軸部２３の両端の外周部に、それぞれＯリング３１，３２を設置するための弧状溝２６，２７を形成する。さらに、コック本体１０の取付孔１６における弧状溝２６，２７と対向する部位にも弧状溝１８，１９を形成する。このように弧状溝２６と１８の間、及び弧状溝２７と１９の間に、それぞれＯリング３１，３２を挾持するようにしているので、摺動部の密閉性の確保が容易となる。つまり、テーパ軸部外周面２２に潤滑剤を塗布した場合に、この潤滑剤が時間の経過と共に流れ出ることを防ぐことができる。なお、このシール機能は、必ずしもテーパ軸部２３の両端にＯリング３１，３２を配置することで得られるものでなく、感知器の設置状態（位置、角度等）によってはテーパ軸部２３の一方の端のみにＯリングを配置してもよいものである。特に、可動軸２０のテーパ軸部２３の縮径側においては、テーパ軸部２３の外周面２２と取付孔１６の内周面との間でくさび効果が働くため、縮径側のＯリング３１の設置位置が自ずと固定される。このため、テーパ軸部２３側のみ弧状溝２６を設けても、テーパ軸部２３の外周面２２と取付孔１６の内周面との間にＯリング３１を確実に挟ませることができる。   Further, arc-shaped grooves 26 and 27 for installing O-rings 31 and 32 are formed on the outer peripheral portions at both ends of the tapered shaft portion 23 of the movable shaft 20, respectively. Furthermore, arc-shaped grooves 18 and 19 are also formed in portions facing the arc-shaped grooves 26 and 27 in the mounting hole 16 of the cock body 10. As described above, since the O-rings 31 and 32 are held between the arc-shaped grooves 26 and 18 and between the arc-shaped grooves 27 and 19, respectively, it is easy to ensure the sealing performance of the sliding portion. That is, when a lubricant is applied to the taper shaft outer peripheral surface 22, it is possible to prevent the lubricant from flowing out over time. This sealing function is not necessarily obtained by arranging the O-rings 31 and 32 at both ends of the taper shaft portion 23. Depending on the installation state (position, angle, etc.) of the sensor, An O-ring may be arranged only at the end of the. In particular, on the reduced diameter side of the taper shaft portion 23 of the movable shaft 20, a wedge effect is exerted between the outer peripheral surface 22 of the taper shaft portion 23 and the inner peripheral surface of the mounting hole 16. The installation position is automatically fixed. For this reason, even if the arc-shaped groove 26 is provided only on the tapered shaft portion 23 side, the O-ring 31 can be reliably sandwiched between the outer peripheral surface 22 of the tapered shaft portion 23 and the inner peripheral surface of the mounting hole 16.

また、可動軸２０のテーパ軸部外周面２２における各通気路２４の開口部の周縁と各長溝２５の周縁にそれぞれ凹溝２８，２９を形成して、各凹溝２８，２９内にそれぞれＯリング３３，３４を設置するようにした。そのため、可動軸２０とコック本体１０を組み付ける前に各Ｏリング３３，３４の取付状態を視認することができて、組付作業が容易となる。さらに、組付後は摺動部の密閉性がより向上し、摺動部に塗布した潤滑剤が時間の経過と共に各通気路２４又は各空気通路１７内に侵入して流れ出ることを防ぐことができる。なお、ここでは各Ｏリング３３，３４を設置するための凹溝２８，２９を可動軸２０側に設けたものを例に挙げて説明したが、これら凹溝をコック本体１０の取付孔１６内面における各空気通路１７の開口部周縁に設けても良いことは言うまでもない。この場合は、摺動部に塗布した潤滑剤が時間の経過と共に直接各空気通路１７内に侵入して流れ出ることを防ぐことができる。   In addition, concave grooves 28 and 29 are formed on the peripheral edge of the opening of each air passage 24 and the peripheral edge of each long groove 25 on the outer peripheral surface 22 of the tapered shaft portion of the movable shaft 20, and O in each of the concave grooves 28 and 29. Rings 33 and 34 were installed. Therefore, before the movable shaft 20 and the cock body 10 are assembled, the mounting state of the O-rings 33 and 34 can be visually confirmed, and the assembling work is facilitated. Furthermore, after the assembly, the sealing portion of the sliding portion is further improved, and the lubricant applied to the sliding portion can be prevented from entering and flowing out into the air passages 24 or the air passages 17 with the passage of time. it can. Here, an example in which the concave grooves 28 and 29 for installing the O-rings 33 and 34 are provided on the movable shaft 20 side has been described. However, these concave grooves are provided on the inner surface of the attachment hole 16 of the cock body 10. Needless to say, it may be provided at the periphery of the opening of each air passage 17. In this case, it is possible to prevent the lubricant applied to the sliding portion from directly entering the air passages 17 and flowing out over time.

本発明の一実施形態に係る差動式分布型感知器の切換コックの構成部材である可動軸と弾性材との関係を示す分解斜視図である。It is a disassembled perspective view which shows the relationship between the movable shaft which is a structural member of the switching cock of the differential distribution type sensor which concerns on one Embodiment of this invention, and an elastic material. 本発明の一実施形態に係る差動式分布型感知器の可動軸に弾性材を装着した状態を示す断面図である。It is sectional drawing which shows the state which mounted | wore the movable shaft of the differential distribution type sensor which concerns on one Embodiment of this invention with the elastic material. 本発明の一実施形態に係る差動式分布型感知器の切換コックの構成部材であるコック本体と可動軸との組付状態を示す斜視図である。It is a perspective view which shows the assembly | attachment state of the cock main body which is a structural member of the switching cock of the differential distribution type sensor which concerns on one Embodiment of this invention, and a movable shaft. 本発明の一実施形態に係る差動式分布型感知器の図３のＡ−Ａ線矢視断面図である。FIG. 4 is a cross-sectional view taken along line AA in FIG. 3 of the differential distributed sensor according to the embodiment of the present invention. 従来の差動式分布型感知器の構成図である。It is a block diagram of a conventional differential distributed sensor. 従来の差動式分布型感知器の試験方法を示す説明図である。It is explanatory drawing which shows the test method of the conventional differential type | mold distributed sensor.

符号の説明Explanation of symbols

１ 切換コック
１０ コック本体
１６ 取付孔
１７ 空気通路
２０ 可動軸
２１ 円柱
２２ テーパ軸部外周面
２３ テーパ軸部
２４ 通気路
２６，２７ 弧状溝
２８，２９ 凹溝
３１，３２ Ｏリング（弾性材）
３３，３４ Ｏリング（弾性材） DESCRIPTION OF SYMBOLS 1 Switching cock 10 Cock main body 16 Mounting hole 17 Air passage 20 Movable shaft 21 Column 22 Tapered axial part outer peripheral surface 23 Tapered axial part 24 Air flow path 26, 27 Arc-shaped groove 28, 29 Concave groove 31, 32 O-ring (elastic material)
33, 34 O-ring (elastic material)

Claims (3)

複数の空気通路とこれら空気通路に連通する取付孔を有するコック本体と、前記空気通路を切り換えるための複数の通気路を有し前記取付孔に回動自在に挿着された可動軸と、からなる切換コックを備えた差動式分布型感知器において、
前記コック本体の前記取付孔を、円錐台状に形成するとともに、
前記可動軸を、基本的に外径が前記円錐台状取付孔の小径部よりも小さくかつ該取付孔とほぼ同じ長さの円柱から形成し、該円柱の軸方向中央部分は、外径が該円柱の外径よりも大きくかつ外周面が前記取付孔の軸方向中央部分と密嵌可能な短尺のテーパ軸部に構成し、該テーパ軸部に、前記空気通路に連通接続するための全ての通気路を配置したことを特徴とする差動式分布型感知器。 A cock body having a plurality of air passages and mounting holes communicating with the air passages, and a movable shaft having a plurality of air passages for switching the air passages and rotatably inserted in the mounting holes. In the differential distributed sensor with a switching cock
While forming the mounting hole of the cock body in a truncated cone shape,
The movable shaft is basically formed from a column whose outer diameter is smaller than the small-diameter portion of the frustoconical mounting hole and has the same length as the mounting hole, and the axial central portion of the column has an outer diameter. All of the outer circumferential surface of the cylinder is configured to be a short taper shaft portion that can be tightly fitted to the axial central portion of the mounting hole, and all the components for connecting the taper shaft portion to the air passage. A differential distribution type sensor characterized by having a ventilation passage. 前記可動軸のテーパ軸部の一端または他端の少なくとも一方の外周部に、弾性材を設置するための弧状溝を形成したことを特徴とする請求項１記載の差動式分布型感知器。   The differential distributed sensor according to claim 1, wherein an arc-shaped groove for installing an elastic material is formed on at least one outer peripheral portion of one end or the other end of the tapered shaft portion of the movable shaft. 前記可動軸のテーパ軸部外周面における各前記通気路の開口部の周縁、又は前記コック本体の取付孔内面における各前記空気通路の開口部の周縁に、それぞれ弾性材を設置するための凹溝を形成したことを特徴とする請求項１又は請求項２記載の差動式分布型感知器。   A groove for installing an elastic material on the periphery of the opening of each air passage on the outer peripheral surface of the tapered shaft of the movable shaft or on the periphery of the opening of each air passage on the inner surface of the attachment hole of the cock body The differential distribution type sensor according to claim 1 or 2, characterized by comprising:
JP2007310882A 2007-11-30 2007-11-30 Differential distributed sensor Expired - Fee Related JP4916424B2 (en)

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