JP3875221B2 - Elastic needle with a built-in metal ball - Google Patents

Elastic needle with a built-in metal ball Download PDF

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JP3875221B2
JP3875221B2 JP2003310925A JP2003310925A JP3875221B2 JP 3875221 B2 JP3875221 B2 JP 3875221B2 JP 2003310925 A JP2003310925 A JP 2003310925A JP 2003310925 A JP2003310925 A JP 2003310925A JP 3875221 B2 JP3875221 B2 JP 3875221B2
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needle
metal
elastic body
cone
rubber
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JP2005076837A (en
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多門 岸田
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岸田精密工業株式会社
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Description

本発明は、流体制御用ニードルバルブ(針弁)のニードル、詳しくは、金属球を内蔵させて、表面が弾性体で被覆されるようにすることにより、安価に製作でき、かつ性能が良くなる弾性体ニードルに関するものである。   The present invention can be manufactured at low cost and improved in performance by incorporating a needle of a fluid control needle valve (needle valve), specifically, a metal sphere so that the surface is covered with an elastic body. The present invention relates to an elastic needle.

円形の流体出入り口(ニードルシート)に円錐形のニードルを押し当てて、流体の出入りを制御するニードルバルブには、古くから金属製のニードルが用いられてきた。通常は、ニードルシートも金属であるから、金属に金属を押し当て流体を完全に止めて漏れを無くするためには、作動する円錐形部の表面を精密に研磨したニードルが必要とされるが、一般にそのようなニードルは大変高価である。そこで、より簡便に流体の漏れを防止する方法として、円錐形の作動部分表面に弾性体(主として合成ゴム)を用いたニードルが広く使われている。   Metal needles have long been used for needle valves that control the flow of fluid by pressing a conical needle against a circular fluid inlet / outlet (needle seat). Normally, the needle seat is also made of metal. Therefore, in order to completely stop the fluid by pressing the metal against the metal and eliminating the leakage, a needle with a precisely polished surface of the operating conical part is required. In general, such needles are very expensive. Therefore, as a method for more easily preventing fluid leakage, a needle using an elastic body (mainly synthetic rubber) on the surface of a conical working part is widely used.

従来のゴムニードルは、図2に示すように、金属製の支持体10の先端に芯金12となる部分(略円錐頭部)を作成し、この芯金12を包み込むように円錐形のゴム層、すなわちゴム円錐体14を付与してニードルを成型する。16は小径部、18は環状溝である。   As shown in FIG. 2, the conventional rubber needle is formed by forming a portion (substantially conical head) that becomes a metal core 12 at the tip of a metal support 10, and conical rubber so as to wrap the metal core 12. A layer, or rubber cone 14, is applied to mold the needle. 16 is a small diameter part, 18 is an annular groove.

ゴム円錐体14の成型に際しては、金型に支持体10を装填するのであるが、装填作業の作業性及び加熱成型中の金型と支持体の熱膨張の差等を考慮して、支持体と金型との間に0.05mm程度のクリアランスが設けてある。
その結果、図3に示すように、成型後のゴムニードルの支持体中心線と円錐体のニードルの先端、すなわちゴム円錐体14の先端にズレαの生じるのが普通である。このようにズレた状態では、いかに弾性体であっても、バルブとしてまともに作用し得ないので、ズレの修正が行われる。
When the rubber cone 14 is molded, the support 10 is loaded into the mold, and the support is considered in consideration of the workability of the loading operation and the difference in thermal expansion between the mold and the support during the heat molding. A clearance of about 0.05 mm is provided between the mold and the mold.
As a result, as shown in FIG. 3, a shift α is usually generated between the support center line of the molded rubber needle and the tip of the cone needle, that is, the tip of the rubber cone 14. In such a misaligned state, no matter how elastic the elastic body is, it cannot function properly as a valve, so the misalignment is corrected.

ズレ修正の方法として、通常は、支持体10を掴んで回転させながらゴム円錐体14のゴム部分を研削する。精度良く研削するために、ゴムを低温硬化させる等の工夫がなされているが、それでも、弾性体をムラ無く研削するのは非常に困難であり、結果的には、芯金12を包むゴム層の厚みが不揃いとなる場合が多い。ゴム層の厚みにバラツキがあると、ニードルシートに押し付けられた時の圧縮量にもバラツキが生じ、その結果、ニードルバルブとして十分に機能しない。圧縮量のバラツキの影響を相対的に小さくするためには、ゴム層の厚みを全体に厚くする必要がある。   As a method of correcting the deviation, usually, the rubber portion of the rubber cone 14 is ground while the support 10 is grasped and rotated. In order to grind with high accuracy, the rubber has been devised such as low-temperature curing. However, it is still very difficult to grind the elastic body without unevenness, and as a result, the rubber layer that wraps the core metal 12. In many cases, the thickness of the film becomes uneven. If the thickness of the rubber layer varies, the amount of compression when pressed against the needle seat also varies, and as a result, it does not function sufficiently as a needle valve. In order to relatively reduce the influence of the variation in the compression amount, it is necessary to increase the thickness of the rubber layer as a whole.

しかしゴム層を厚くすると、ニードルシートに押し付けられた時に生じるゴムの残留歪み(回復しないゴムのへこみ)が大きくなる。この残留歪みはニードルの損傷と見なすべきものであり、この量の大小が直ちにゴムニードルの寿命を左右する。そこで、ゴムニードルに局部的な圧力が加わって強く圧縮されないように、ニードルと接するシートの穴のエッジの面を取ったり、Rを付けたりする面倒な対策がとられている。ニードルバルブが確実に作動し、なおかつ、長期間の使用に耐えるためには、ゴムニードルに圧縮回復性が良くて柔軟なゴムをできる限り薄く付与するのが望ましい。   However, when the rubber layer is thickened, the residual strain of rubber (the dent of the rubber that does not recover) generated when pressed against the needle seat increases. This residual strain should be regarded as needle damage, and the amount of this amount immediately determines the life of the rubber needle. Therefore, troublesome measures such as taking the surface of the edge of the hole of the sheet in contact with the needle or attaching R so that local pressure is not applied to the rubber needle and compressed strongly. In order for the needle valve to operate reliably and to withstand long-term use, it is desirable to apply a rubber that is highly compressible and flexible to the rubber needle as thin as possible.

また、従来、ニードルバルブとして、長手軸心方向にのびるガイド部と、円錐形状に形成された円錐頭部と、ガイド部と円錐頭部とを連結するとともにガイド部の先端と円錐頭部の後端との間に環状溝を形成する小径部とを備え、小径部と円錐頭部の外周にゴム材料よりなる円錐弁部を焼付接着したニードルバルブにおいて、円錐頭部の外周面上に、ガイド部の長手軸心方向に沿う複数の縦溝を穿設し、小径部を含む円錐頭部の外周面にゴム材料よりなる円錐形状の円錐弁部を焼付接着したものが知られている(例えば、特許文献1参照)。
しかしながら、特許文献1記載のニードルバルブにおいても、円錐頭部の外周面にゴム材料よりなる円錐弁部を焼付接着する工程は、金型による成型工程によるものであり、上述の図2及び図3における問題点は依然として残っている。
実開平7−29363号公報(第2頁、図1)
Conventionally, as a needle valve, a guide portion extending in the longitudinal axis direction, a conical head formed in a conical shape, a guide portion and a conical head are connected, and the tip of the guide portion and the rear of the conical head are connected. A needle valve having a small-diameter portion that forms an annular groove between the end and a cone valve portion made of rubber material on the outer periphery of the small-diameter portion and the conical head. It is known that a plurality of longitudinal grooves along the longitudinal axis direction of the portion are formed, and a conical conical valve portion made of a rubber material is baked and bonded to the outer peripheral surface of the conical head including the small diameter portion (for example, , See Patent Document 1).
However, also in the needle valve described in Patent Document 1, the process of baking and bonding the conical valve portion made of a rubber material to the outer peripheral surface of the conical head is based on the molding process using a mold, and the above-described FIGS. The problem still remains.
Japanese Utility Model Publication No. 7-29363 (2nd page, FIG. 1)

解決しようとする問題点は、成型工程における金型上での加工や後工程での研削等、精度が出にくくて、かつコストの嵩む点である。   The problem to be solved is that it is difficult to obtain accuracy such as processing on the mold in the molding process and grinding in the subsequent process, and the cost is increased.

本発明は、金型による成型工程を用いずに、金型上での加工や後工程での研削等、精度が出にくくて、かつコストの嵩む工程をなくして、従来製法によるものよりも安価で性能の良い弾性体ニードルを得ることを最も主要な特徴とする。   The present invention eliminates the need for a precision process such as processing on a mold or grinding in a subsequent process without using a molding process using a mold, and eliminates an expensive process, so that it is less expensive than the conventional process. The main feature is to obtain an elastic needle with good performance.

本発明の金属球を内蔵する弾性体ニードルは、流体制御用ニードルバルブ用のニードルであって、金属球を内蔵し、表面が弾性体で覆われたことを特徴としている。
また、本発明の金属球を内蔵する弾性体ニードルは、流体制御用ニードルバルブ用のニードルであって、管状の支持体の先端部に、弾性体からなる中空状の円錐体及び該円錐体に連設された弾性体からなる小径短円筒部の該小径短円筒部を嵌設し、小径短円筒部内から円錐体の中空部にわたって金属球を挿入・固定してなることを特徴としている。
これらのニードルにおいて、金属球の直径は1〜5mmとすることが好ましい。また、弾性体はゴム材料であることが好ましい。
The elastic needle incorporating the metal sphere of the present invention is a needle for a fluid control needle valve, characterized in that the metal sphere is incorporated and the surface is covered with an elastic body.
The elastic needle incorporating the metal sphere of the present invention is a needle for a fluid control needle valve, and includes a hollow cone made of an elastic body at the tip of a tubular support, and the cone. The small-diameter short cylindrical portion made of a continuous elastic body is fitted into the small-diameter short cylindrical portion, and metal balls are inserted and fixed from the small-diameter short cylindrical portion to the hollow portion of the cone.
In these needles, the diameter of the metal sphere is preferably 1 to 5 mm. The elastic body is preferably a rubber material.

本発明のニードルを製造する場合、金属支持体と弾性体(以下、単にゴムという)からなる円錐体部分のズレが生じる成型工程がなくなるので、ズレを修正する工程も不要となる。ゴム円錐体を単独に成型するので、ゴム層を任意の硬度、任意の厚みにして、しかもバラツキのないゴムニードルの製造が可能である。その構造は、一見複雑化したようであるが、金型上での加工や後工程での研削等、精度が出にくくて、かつコストの嵩む工程がないので、従来製法よりも安価で性能の良いゴムニードルとなる。予め作成しておいたゴム円錐体を金属支持体に挿入し、円錐体の内部に金属球を入れて、ゴム層を内側から支える芯金とする。芯金に金属球を使うのは、表面が滑らかで寸法精度が良く、しかも、安価だからである。金属球を保持、固定する目的で、金属球の後方に樹脂(接着剤)等を注入することが一般的であるが、金属球の移動や脱落を防ぎさえすれば、どのような方法を用いてもかまわない。   When the needle of the present invention is manufactured, there is no need for a molding step in which a deviation of a cone portion composed of a metal support and an elastic body (hereinafter simply referred to as rubber) occurs, and thus a step of correcting the deviation is unnecessary. Since the rubber cone is molded independently, it is possible to manufacture a rubber needle having a rubber layer having an arbitrary hardness and an arbitrary thickness and having no variation. The structure seems to be complicated at first glance, but it is less accurate and less expensive than the conventional manufacturing method because it is difficult to achieve precision and costly processes such as processing on the mold and grinding in the subsequent process. It becomes a good rubber needle. A rubber cone prepared in advance is inserted into a metal support, a metal ball is placed inside the cone, and a metal core that supports the rubber layer from the inside is formed. The metal sphere is used for the metal core because it has a smooth surface, good dimensional accuracy, and is inexpensive. For the purpose of holding and fixing the metal sphere, it is common to inject resin (adhesive) etc. behind the metal sphere, but any method can be used as long as it prevents the metal sphere from moving and dropping off. It doesn't matter.

本発明はつぎのような効果を奏する。
(1) 金属製の支持体と弾性体からなる円錐体部分のズレが生じる成型工程がなくなるので、ズレを修正する工程も不要となる。
(2) 弾性体からなる円錐体を単独に成型するので、弾性体層を任意の硬度、任意の厚みにすることができ、バラツキのない弾性体ニードルの製造が可能である。
(3) 金型上での加工や後工程での研削等、精度が出にくくて、かつ、コストの嵩む工程がなくなり、安価で、かつ性能の良い弾性体ニードルを得ることができる。
The present invention has the following effects.
(1) Since there is no molding process in which the deviation of the cone portion made of the metal support and the elastic body is generated, a process of correcting the deviation is also unnecessary.
(2) Since a cone made of an elastic body is molded independently, the elastic body layer can be made to have an arbitrary hardness and an arbitrary thickness, and an elastic needle without variation can be manufactured.
(3) An elastic needle that is less expensive and has high performance, such as processing on a mold or grinding in a subsequent process, is eliminated, and a costly process is eliminated.

流体制御用ニードルバルブ用のニードルを、安価で、かつ性能の良いものとするという目的を、弾性体内部に金属球を設け、表面を弾性体で被覆することにより実現した。   The objective of making the needle for the fluid control needle valve inexpensive and good in performance was realized by providing a metal ball inside the elastic body and covering the surface with the elastic body.

以下、本発明の実施の形態について説明するが、本発明は下記の実施の形態に何ら限定されるものではなく、適宜変更して実施することができるものである。図1は、本発明の実施の第1形態による金属球を内蔵する弾性体ニードルを示している。20は弾性体からなる円錐体で、中空部(空胴部)22を有している。この円錐体20は直径1〜5mmの金属球(芯金)24を内蔵し、表面が弾性体26で覆われている。28は金属製の支持体、30は樹脂である。   Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications. FIG. 1 shows an elastic needle incorporating a metal ball according to a first embodiment of the present invention. Reference numeral 20 denotes a cone made of an elastic body, which has a hollow portion (cavity portion) 22. The cone 20 contains a metal sphere (core metal) 24 having a diameter of 1 to 5 mm, and the surface is covered with an elastic body 26. 28 is a metal support, and 30 is a resin.

弾性体ニードルを製造するに際し、予め作成しておいた弾性体からなる円錐体20を支持体28に挿入し、円錐体20内部に金属球24を入れて、弾性体を内側から支える芯金とする。芯金に金属球24を使うのは、前述のように、表面が滑らかで寸法精度が良く、しかも、安価だからである。金属球24を保持、固定するためには、一例として、金属球24の後方(図1における右側)に樹脂(接着剤)30等を注入する方法が採用されるが、金属球24の移動や脱落を防ぎさえすれば、どのような方法を用いてもかまわない。   When manufacturing an elastic needle, a cone 20 made of an elastic body prepared in advance is inserted into the support 28, a metal ball 24 is inserted inside the cone 20, and a metal core that supports the elastic body from the inside To do. The metal ball 24 is used for the cored bar because, as described above, the surface is smooth, the dimensional accuracy is good, and the price is low. In order to hold and fix the metal sphere 24, as an example, a method of injecting a resin (adhesive) 30 or the like behind the metal sphere 24 (right side in FIG. 1) is employed. Any method can be used as long as it prevents the dropout.

本実施形態の弾性体ニードルは、図1に示すように、管状の支持体28の先端部に、予め製作された弾性体からなる中空状の円錐体20及び該円錐体20に連設された弾性体からなる小径短円筒部32の該小径短円筒部32を嵌設し、小径短円筒部32内から円錐体20の中空部22にわたって直径1〜5mmの1つの金属球24を芯金として挿入・固定してなっている。34は支持体28の先端に設けられた固定用突起である。弾性体からなる小径短円筒部32は、固定用突起34と同じ形状に予め製作されている。   As shown in FIG. 1, the elastic needle of the present embodiment is connected to a distal end portion of a tubular support 28 with a hollow cone 20 made of a previously produced elastic body and the cone 20. The small-diameter short cylindrical portion 32 of the small-diameter short cylindrical portion 32 made of an elastic body is fitted, and one metal ball 24 having a diameter of 1 to 5 mm extends from the inside of the small-diameter short cylindrical portion 32 to the hollow portion 22 of the cone 20 as a core metal. Inserted and fixed. Reference numeral 34 denotes a fixing protrusion provided at the tip of the support 28. The small-diameter short cylindrical portion 32 made of an elastic body is manufactured in advance in the same shape as the fixing projection 34.

本実施形態の弾性体ニードルにおいて、弾性体としては、合成ゴム等のゴム材料、ナイロン、軟質塩化ビニル等のプラスチックが用いられる。また、支持体としては、通常アルミニウム合金、銅合金、ステンレススチール等が用いられる。また、金属球としては、鋼球(スチールボール、いわゆるベアリング球)、黄銅球、鉛球、ステンレススチール球、超硬球等が用いられる。   In the elastic needle of the present embodiment, a rubber material such as synthetic rubber, or a plastic such as nylon or soft vinyl chloride is used as the elastic body. Moreover, as a support body, an aluminum alloy, a copper alloy, stainless steel, etc. are used normally. As the metal balls, steel balls (steel balls, so-called bearing balls), brass balls, lead balls, stainless steel balls, carbide balls, and the like are used.

本発明の実施の第1形態による金属球を内蔵する弾性体ニードルの縦断面説明図である。It is a longitudinal cross-sectional explanatory drawing of the elastic body needle | hook containing the metal ball by 1st Embodiment of this invention. 従来のゴムニードルの縦断面説明図である。It is a longitudinal cross-sectional explanatory drawing of the conventional rubber needle. 従来のゴムニードルの成型後の縦断面説明図である。It is longitudinal cross-sectional explanatory drawing after the shaping | molding of the conventional rubber needle.

符号の説明Explanation of symbols

10 支持体
12 芯金
14 ゴム円錐体
16 小径部
18 環状溝
20 弾性体からなる円錐体
22 中空部
24 金属球(芯金)
26 弾性体
28 支持体
30 樹脂
32 小径短円筒部
34 固定用突起
DESCRIPTION OF SYMBOLS 10 Support body 12 Core metal 14 Rubber cone 16 Small diameter part 18 Annular groove 20 Cone body which consists of elastic bodies 22 Hollow part 24 Metal ball (core metal)
26 Elastic body 28 Support body 30 Resin 32 Small diameter short cylindrical portion 34 Fixing protrusion

Claims (3)

流体制御用ニードルバルブ用のニードルであって、管状の支持体の先端部に、弾性体からなる中空状の円錐体及び該円錐体に連設された弾性体からなる小径短円筒部の該小径短円筒部を嵌設し、小径短円筒部内から円錐体の中空部にわたって金属球を挿入・固定してなることを特徴とする金属球を内蔵する弾性体ニードル。   A needle for a fluid control needle valve, wherein the small diameter of a hollow cone made of an elastic body and a small diameter short cylinder made of an elastic body connected to the cone at the tip of a tubular support An elastic needle with a built-in metal sphere, wherein a short cylindrical part is fitted and a metal sphere is inserted and fixed from the inside of a small-diameter short cylindrical part to a hollow part of a cone. 金属球の直径が1〜5mmである請求項記載の金属球を内蔵する弾性体ニードル。 Elastic needle diameter of the metal ball is built claim 1, wherein the metal ball is 1 to 5 mm. 弾性体がゴム材料である請求項1又は2記載の金属球を内蔵する弾性体ニードル。 The elastic body needle containing the metal ball according to claim 1 or 2, wherein the elastic body is a rubber material.
JP2003310925A 2003-09-03 2003-09-03 Elastic needle with a built-in metal ball Expired - Lifetime JP3875221B2 (en)

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