JPH04351379A - Ceramic disc valve - Google Patents
Ceramic disc valveInfo
- Publication number
- JPH04351379A JPH04351379A JP12774591A JP12774591A JPH04351379A JP H04351379 A JPH04351379 A JP H04351379A JP 12774591 A JP12774591 A JP 12774591A JP 12774591 A JP12774591 A JP 12774591A JP H04351379 A JPH04351379 A JP H04351379A
- Authority
- JP
- Japan
- Prior art keywords
- valve body
- sliding
- valve
- sliding surface
- ceramic
- 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.)
- Granted
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 33
- 239000013078 crystal Substances 0.000 claims abstract description 25
- 238000007789 sealing Methods 0.000 abstract description 9
- 239000000314 lubricant Substances 0.000 abstract description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 8
- 238000010304 firing Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000006061 abrasive grain Substances 0.000 description 4
- 229910003460 diamond Inorganic materials 0.000 description 4
- 239000010432 diamond Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910052593 corundum Inorganic materials 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Sliding Valves (AREA)
- Multiple-Way Valves (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、フォーセットバルブな
どのディスク状をしたバルブに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk-shaped valve such as a faucet valve.
【０００２】0002
【従来の技術】湯水混合栓用フォーセットなど、２枚の
ディスク状弁体を互いに摺接した状態で相対移動させる
ことによって、各弁体に形成した流体通路の開通、遮断
を行うようにしたバルブが一般的に用いられている。例
えば、図１に示すように、固定弁体２と可動弁体１を、
互いの摺接面１ａ、２ａで接した状態としておいて、レ
バー３の操作で可動弁体１を移動させることによって、
供給流体の開閉、切替え、調節、混合等の制御を行うこ
とができるようになっていた。[Prior Art] A faucet for a hot water mixing faucet, etc., opens and closes a fluid passage formed in each valve element by moving two disk-shaped valve elements relative to each other while in sliding contact with each other. Valves are commonly used. For example, as shown in FIG. 1, a fixed valve body 2 and a movable valve body 1 are
By moving the movable valve body 1 by operating the lever 3 while keeping the sliding surfaces 1a and 2a in contact with each other,
It was possible to control the opening/closing, switching, adjustment, mixing, etc. of the supply fluid.
【０００３】この種のバルブに対する要求特性は、下記
の通りであった。The required characteristics for this type of valve are as follows.
【０００４】（１） 各弁体間のシール性が保持されて
いること（日本水道協会規格耐圧１７．５ｋｇ／ｃｍ２
での水漏れが無いこと）
（２） レバー操作トルクが小さいこと（１０ｋｇｆ・
ｃｍ以下）
（３） レバー操作トルクが長期間の使用に際して変化
しにくいこと
これらの要求特性を満たすために、近年では、各弁体の
材質として、アルミナ、炭化珪素等のセラミックが用い
られていた。この場合、可動弁体１、固定弁体２の摺接
面１ａ、２ａの中心線平均粗さ（Ｒａ）をそれぞれ、０
．２μｍ以下、および０．３〜０．６μｍとし、かつ各
摺接面１ａ、２ａの平坦度を１μｍ以下とすればよいこ
とを、本出願人は既に提案した（特開平１−１１６３８
６号公報参照）。(1) The sealing performance between each valve body is maintained (Japan Water Works Association standard pressure resistance 17.5 kg/cm2
(2) Lever operating torque must be small (10kgf・
cm or less) (3) Lever operating torque is difficult to change during long-term use To meet these required characteristics, in recent years, ceramics such as alumina and silicon carbide have been used as the material for each valve body. . In this case, the centerline average roughness (Ra) of the sliding surfaces 1a and 2a of the movable valve body 1 and the fixed valve body 2 is set to 0.
．． The applicant has already proposed that the flatness of each sliding surface 1a, 2a should be 1 μm or less (Japanese Patent Laid-Open No. 1-11638).
(See Publication No. 6).
【０００５】[0005]
【従来技術の課題】ところが、上記の如き従来のセラミ
ックディスクバルブでは、セラミックが耐磨耗性、耐蝕
性に優れているため、長期間安定なものであるが、各弁
体間の摺動特性を上記要求レベルとするために、潤滑剤
が不可欠であった。そのため、長期使用中には、この潤
滑剤が流出して操作トルクが大きくなるという問題点が
あった。また、潤滑剤の種類によっては、長期使用中に
劣化したり、ゴミ等の付着による摺動特性の悪化も避け
られなかった。[Problems with the Prior Art] However, in the conventional ceramic disc valve as described above, ceramic has excellent wear resistance and corrosion resistance, so it is stable for a long period of time, but the sliding characteristics between each valve element In order to achieve the above required level, a lubricant was essential. Therefore, during long-term use, this lubricant flows out and the operating torque becomes large. Furthermore, depending on the type of lubricant, it is inevitable that the lubricant will deteriorate during long-term use or that the sliding characteristics will deteriorate due to the adhesion of dust and the like.
【０００６】さらに、これらの問題を解決するために、
各弁体の少なくともいずれか一方を、三次元網目構造の
多孔質セラミックスで形成し、このセラミックスの開放
気孔中に樹脂やオイルなどを含浸させたものもあった（
特開昭６１−２０６８７５号、６１−２４４９８０号、
６２−４９４９号、６２−３７５１７号公報等参照）。
しかし、これは、複合材料であり、異材質の組合せであ
るため、各弁体間の硬度差により、一方の弁体の磨耗が
進み、初期の摺接面が維持されず、結果として操作トル
クが大きくなるという問題点があった。Furthermore, in order to solve these problems,
In some cases, at least one of each valve body is made of porous ceramics with a three-dimensional network structure, and the open pores of this ceramic are impregnated with resin, oil, etc.
JP-A-61-206875, 61-244980,
62-4949, 62-37517, etc.). However, since this is a composite material and a combination of different materials, the difference in hardness between each valve element causes one of the valve elements to wear out, and the initial sliding contact surface is not maintained, resulting in the operating torque. The problem was that it became large.
【０００７】[0007]
【課題を解決するための手段】上記に鑑みて本発明は、
セラミックディスクバルブにおいて、２枚の弁体のうち
一方の摺接面を中心線平均粗さ（Ｒａ）０．２μｍ以下
の滑らかな面とし、他方の摺接面を中心線平均粗さ（Ｒ
ａ）０．３〜０．６μｍ、結晶曲率半径２μｍ以上とし
たものである。[Means for Solving the Problems] In view of the above, the present invention has the following features:
In a ceramic disc valve, one of the two valve bodies has a smooth sliding surface with a centerline average roughness (Ra) of 0.2 μm or less, and the other sliding surface has a centerline average roughness (R
a) 0.3 to 0.6 μm and a crystal curvature radius of 2 μm or more.
【０００８】なお、本発明において表面の結晶曲率半径
とは、セラミックス表面近傍部分の切断面を電子顕微鏡
で拡大して写真撮影し、この写真をもとにして、表面に
露出した結晶の最も鋭いエッジ部分の曲率半径を測定し
た値のことである。即ち、本発明のセラミックディスク
バルブは、摺接面の結晶曲率半径が２μｍ以上と大きく
、結晶が丸みを帯びていることから、摺接面の実体摺動
面積（Ｒｅａｌ Ａｒｅａ ｏｆ Ｃｏｎｔａｃ
ｔ）が小さく、摺動性を高めることができる。In the present invention, the radius of curvature of a crystal on the surface refers to the radius of curvature of a crystal exposed on the surface, which is obtained by enlarging and photographing a cut section near the surface of a ceramic using an electron microscope, and based on this photograph. This is the measured value of the radius of curvature of the edge portion. That is, in the ceramic disc valve of the present invention, the radius of crystal curvature of the sliding surface is as large as 2 μm or more, and the crystal is rounded.
t) is small, and slidability can be improved.
【０００９】また、このような摺接面は、例えば焼結後
のセラミックス表面に研削等の加工を施した後、再焼成
することによって得ることができる。Further, such a sliding surface can be obtained by, for example, processing the sintered ceramic surface by grinding, etc., and then re-firing the ceramic surface.
【００１０】0010
【実施例】以下、本発明の実施例を説明する。[Examples] Examples of the present invention will be described below.
【００１１】図１に示す湯水混合栓のバルブは、セラミ
ックスからなる固定弁体２と可動弁体１が摺接した状態
で配置され、レバー３で可動弁体１を移動させることに
よって、流通路の連通、遮断を行うようになっている。
このとき、可動弁体１と固定弁体２の摺接面１ａ、２ａ
が摺動することとなるが、レバー３の操作トルクを低く
し、かつシール性を高めるためには、この摺接面１ａ、
２ａの状態が重要である。The hot water mixing faucet valve shown in FIG. 1 is arranged such that a fixed valve body 2 made of ceramics and a movable valve body 1 are in sliding contact with each other, and by moving the movable valve body 1 with a lever 3, the flow path is opened. It is designed to communicate and cut off communication. At this time, the sliding surfaces 1a and 2a of the movable valve body 1 and the fixed valve body 2
However, in order to lower the operating torque of the lever 3 and improve sealing performance, the sliding contact surfaces 1a,
Condition 2a is important.
【００１２】本発明のセラミックディスクバルブにおい
て、図１中のＡ部を１５００倍に拡大した電子顕微鏡写
真の概略図を図２に示すように、固定弁体２の摺接面２
ａを形成するセラミックスの結晶２ｂは、結晶曲率半径
が２μｍ以上と鋭いエッジのない丸みを帯びた形状であ
り、かつ摺接面２ａ全体として中心線平均粗さ（Ｒａ）
０．３〜０．６μｍと適度に凹凸を持っている。そのた
め、セラミックディスクバルブとして使用した時に、摺
接面１ａ、２ａの実体摺動面積が小さく、かつ互いにキ
ズを付けにくいことから、長期にわたって低い操作トル
クを維持できる。In the ceramic disc valve of the present invention, the sliding contact surface 2 of the fixed valve body 2 is shown in FIG.
The ceramic crystal 2b forming part a has a rounded shape with no sharp edges, with a crystal curvature radius of 2 μm or more, and the center line average roughness (Ra) of the sliding surface 2a as a whole
It has moderate irregularities of 0.3 to 0.6 μm. Therefore, when used as a ceramic disc valve, the actual sliding area of the sliding surfaces 1a and 2a is small and they are less likely to scratch each other, making it possible to maintain low operating torque over a long period of time.
【００１３】また、このように摺接面２ａの結晶を丸み
を帯びた状態とするためには、セラミック体を再焼成す
ればよい。即ち、本発明のセラミックディスクバルブを
構成する固定弁体２の製造方法は以下の通りである。ま
ず、アルミナセラミック原料を所定の円盤形状に成形し
た後、１６００〜１７００℃の温度で焼成する。次に、
得られたセラミック体の表面をダイヤモンド砥粒で研磨
するが、このときのダイヤモンド砥粒の粒度を変化させ
ることで、自由にセラミック体の表面粗さを変化させる
ことができる。最後に、このセラミック体を再焼成する
が、このときの温度は、焼成温度以下の１０００〜１６
００℃とすればよい。そして、このように再焼成するこ
とによって、摺接面２ａの結晶が、鋭いエッジのない丸
い形状となる。[0013] Furthermore, in order to make the crystals of the sliding surface 2a rounded in this way, the ceramic body may be re-fired. That is, the method for manufacturing the fixed valve body 2 constituting the ceramic disc valve of the present invention is as follows. First, an alumina ceramic raw material is formed into a predetermined disc shape, and then fired at a temperature of 1600 to 1700°C. next,
The surface of the obtained ceramic body is polished with diamond abrasive grains, and by changing the particle size of the diamond abrasive grains at this time, the surface roughness of the ceramic body can be freely changed. Finally, this ceramic body is refired at a temperature of 1000 to 160°C, which is below the firing temperature.
It may be set to 00°C. By re-firing in this manner, the crystals on the sliding surface 2a have a round shape without sharp edges.
【００１４】参考までに、上記製造工程中、ダイヤモン
ド砥石による研摩後の摺接面２ａの状態（従来のセラミ
ックディスクバルブの摺接面に相当する）を図３に示す
。これを図２と比較すれば明らかなように、再焼成する
ことによって、摺接面２ａの結晶を丸くできることがわ
かる。For reference, FIG. 3 shows the state of the sliding surface 2a (corresponding to the sliding surface of a conventional ceramic disc valve) after being polished with a diamond grindstone during the above manufacturing process. As is clear from comparing this with FIG. 2, it can be seen that the crystals on the sliding surface 2a can be rounded by re-firing.
【００１５】なお、本発明では、上記のようにセラミッ
ク体表面の結晶の丸みの大きさを表すために結晶曲率半
径を測定した。これは、図２に示すように、摺接面２ａ
近傍の断面の拡大写真を撮影し、この写真上で、表面に
露出した結晶の最も鋭いエッジの曲率半径Ｒを測定した
ものである。したがって、結晶曲率半径が大きいほど結
晶が丸みを帯びたものであることになる。In the present invention, as described above, the radius of crystal curvature was measured in order to express the roundness of the crystal on the surface of the ceramic body. As shown in FIG.
An enlarged photograph of a nearby cross section was taken, and the radius of curvature R of the sharpest edge of the crystal exposed on the surface was measured on this photograph. Therefore, the larger the radius of crystal curvature, the more rounded the crystal.
【００１６】また、上記実施例では、固定弁体２の摺接
面２ａのみについて述べたが、可動弁体１の摺接面１ａ
は再焼成は行わずに、中心線平均粗さ（Ｒａ）０．２μ
ｍ以下の滑らかな面としてある。これは、両方の摺接面
を、再焼成するとシール性が悪くなってしまうためであ
る。即ち、本発明のセラミックディスクバルブは、可動
弁体１、固定弁体２のいずれか一方の摺接面を中心線平
均粗さ（Ｒａ）０．３〜０．６μｍで、再焼成を行って
結晶曲率半径２μｍ以上とし、他方の摺接面は中心線平
均粗さ（Ｒａ）０．２μｍ以下で再焼成は行わないもの
が良い。Further, in the above embodiment, only the sliding surface 2a of the fixed valve body 2 was described, but the sliding surface 1a of the movable valve body 1
Center line average roughness (Ra) 0.2μ without re-firing
It is a smooth surface with a diameter of less than m. This is because the sealing performance deteriorates when both sliding surfaces are refired. That is, in the ceramic disc valve of the present invention, the sliding surface of either the movable valve body 1 or the fixed valve body 2 is refired to a center line average roughness (Ra) of 0.3 to 0.6 μm. It is preferable that the radius of crystal curvature is 2 μm or more, and the other sliding surface has a center line average roughness (Ra) of 0.2 μm or less and is not re-fired.
【００１７】また、上記可動弁体１、固定弁体２のうち
、再焼成を行う方の弁体は、Ａｌ２ Ｏ３ を主成分と
し、ＳｉＯ２ 、ＣａＯ、ＭｇＯなどの公知の焼結助剤
を含むアルミナセラミックスを用いるが、他方の弁体は
、アルミナセラミックスに限らず、ジルコニア、炭化珪
素、窒化珪素などのセラミックスを用いてもよい。Of the movable valve body 1 and the fixed valve body 2, the one to be refired has Al2O3 as its main component and contains known sintering aids such as SiO2, CaO, and MgO. Although alumina ceramics are used, the other valve body is not limited to alumina ceramics, and ceramics such as zirconia, silicon carbide, and silicon nitride may also be used.
【００１８】実験例１
次に、本発明のセラミックディスクバルブを試作して、
実験を行った。Experimental Example 1 Next, a ceramic disc valve of the present invention was prototyped.
We conducted an experiment.
【００１９】平均粒子径３μｍのＡｌ２ Ｏ３ 粉末に
Ｔｉを３〜５重量％、ＳｉＯ２ を４重量％、ＭｇＯを
０．５重量％、ＣａＯを０．５重量％添加し、さらに成
形助剤としてＰＶＡ、ＰＥＧを各々２重量％、その他有
機物を数重量％添加し、アルミナボールを用いてボール
ミル粉砕混合を約５０時間行った。得られたスラリー状
原料をスプレードライヤーで造粒し、乾式加圧成形後、
酸化雰囲気中、約１６００℃で焼成を行った。得られた
焼結体は、平均結晶粒子径が５〜２０μｍ の針状結晶
で、Ａｌ２ Ｏ３ 含有量が約９０％、嵩比重３．６の
緻密質で、ビッカース硬度１２００ｋｇ／ｍｍ２ （荷
重５００ｇ）、曲げ強度３５００ｋｇ／ｍｍ２ 、ヤン
グ率２．７×１０６ ｋｇ／ｃｍ２ であった。3 to 5% by weight of Ti, 4% by weight of SiO2, 0.5% by weight of MgO, and 0.5% by weight of CaO were added to Al2O3 powder with an average particle size of 3 μm, and PVA was added as a molding aid. , PEG and several other organic substances were added thereto, and pulverized and mixed in a ball mill using an alumina ball for about 50 hours. The obtained slurry raw material is granulated with a spray dryer, and after dry pressure molding,
Firing was performed at about 1600° C. in an oxidizing atmosphere. The obtained sintered body has needle-shaped crystals with an average crystal grain size of 5 to 20 μm, an Al2O3 content of about 90%, a dense bulk density of 3.6, and a Vickers hardness of 1200 kg/mm2 (load of 500 g). , bending strength of 3500 kg/mm2, and Young's modulus of 2.7×106 kg/cm2.
【００２０】この焼結体を図１に示した可動弁体１、固
定弁体２とし、その摺接面１ａ、２ａをＧＣ砥粒により
荒研磨した後、ダイヤモンド砥粒により最終仕上げ加工
を行った。このとき、固定弁体２の摺接面２ａを中心線
平均粗さ（Ｒａ）０．３〜０．６μｍ、平坦度１μｍ以
下とし、また、可動弁体１の摺接面１ａを中心線平均粗
さ（Ｒａ）０．２μｍ以下、平坦度１μｍ以下とした。This sintered body was used as the movable valve body 1 and the fixed valve body 2 shown in FIG. 1, and after rough polishing the sliding surfaces 1a and 2a with GC abrasive grains, final finishing was performed with diamond abrasive grains. Ta. At this time, the sliding surface 2a of the fixed valve body 2 has a centerline average roughness (Ra) of 0.3 to 0.6 μm and a flatness of 1 μm or less, and the sliding surface 1a of the movable valve body 1 has a centerline average roughness (Ra) of 0.3 to 0.6 μm or less. The roughness (Ra) was 0.2 μm or less, and the flatness was 1 μm or less.
【００２１】その後、固定弁体２のみを約１２００℃で
再焼成した。再焼成の前後での表面状態を比較したとこ
ろ、表１に示すように結晶曲率半径が大きくなり、その
結果実体摺動面積が減少することがわかった。なお、こ
こで実体摺動面積とは、画像解析によって摺接面２ａの
摺動部分の面積を直接測定したもので、再焼成前を１と
したときの比を求めた。また、表１によれば、再焼成す
ることによって平坦度が悪くなるが、平坦度１μｍ以下
であれば問題ない。[0021] Thereafter, only the fixed valve body 2 was refired at about 1200°C. A comparison of the surface conditions before and after re-firing revealed that, as shown in Table 1, the radius of crystal curvature increased, resulting in a decrease in the actual sliding area. Note that the actual sliding area here refers to the area of the sliding portion of the sliding contact surface 2a that was directly measured by image analysis, and the ratio was calculated when the area before refiring was set to 1. Further, according to Table 1, the flatness deteriorates due to re-firing, but there is no problem as long as the flatness is 1 μm or less.
【００２２】[0022]
【表１】[Table 1]
【００２３】次に、比較例として、可動弁体１と固定弁
体２の両方を再焼成したもの（比較例１）および可動弁
体１、固定弁体２のいずれも再焼成しないもの（比較例
２）を用意し、上記本発明実施例とともに、使用試験を
行った。いずれも、潤滑剤を用いずに、操作を繰り返し
た時の操作トルクの値を測定した。結果は、表２および
図４に示す通りである。Next, as comparative examples, one in which both the movable valve body 1 and the fixed valve body 2 were refired (Comparative Example 1), and one in which neither the movable valve body 1 nor the fixed valve body 2 were refired (Comparative Example 1). Example 2) was prepared, and a usage test was conducted along with the above-mentioned examples of the present invention. In each case, the operation torque value was measured when the operation was repeated without using a lubricant. The results are shown in Table 2 and FIG. 4.
【００２４】さらに、上記と同様にして、水圧を変化さ
せた時のシール性評価試験も実施した。この結果は表３
に示す通りである。[0024] Furthermore, in the same manner as above, a sealing performance evaluation test was also conducted when the water pressure was varied. This result is shown in Table 3
As shown.
【００２５】[0025]
【表２】[Table 2]
【００２６】[0026]
【表３】[Table 3]
【００２７】これらの結果より明らかに、比較例２は摺
接面の結晶が丸みを帯びたものでないため、１０万サイ
クルを越えると極端に操作トルクが大きくなるという問
題点があった。一方比較例１は、両方の摺接面１ａ、２
ａを共に再焼成したため、操作トルクは低かったものの
、表３に示すようにシール性が悪く、１７．５ｋｇ／ｃ
ｍ２ での水漏れがあった。From these results, it is clear that Comparative Example 2 had a problem in that since the crystals on the sliding surface were not rounded, the operating torque became extremely large after 100,000 cycles. On the other hand, in Comparative Example 1, both sliding surfaces 1a and 2
Although the operating torque was low because a was refired, as shown in Table 3, the sealing performance was poor and the
There was a water leak in m2.
【００２８】これに対し、本発明実施例では、一方の摺
接面２ａのみを再焼成したため、表２、図４に示すよう
に低い操作トルクを長期間維持でき、かつ表３に示すよ
うにシール性も優れていた。In contrast, in the embodiment of the present invention, only one sliding contact surface 2a was refired, so that a low operating torque could be maintained for a long period of time as shown in Table 2 and FIG. 4, and as shown in Table 3. The sealing properties were also excellent.
【００２９】実験例２
次に、上記本発明実施例において、固定弁体２の摺接面
２ａの表面粗さを変化させて同様の試験を行った。結果
は表４に示すように、摺接面２ａの中心線平均粗さ（Ｒ
ａ）が０．３μｍより小さいと操作トルクが大きく、一
方中心線平均粗さ（Ｒａ）が０．６μｍより大きいとシ
ール性が悪かった。したがって、摺接面２ａの中心線平
均粗さ（Ｒａ）は０．３〜０．６μｍのものが良かった
。Experimental Example 2 Next, a test similar to that of the above embodiment of the present invention was conducted by changing the surface roughness of the sliding surface 2a of the fixed valve body 2. As shown in Table 4, the results are as follows: center line average roughness (R
When a) was smaller than 0.3 μm, the operating torque was large, while when the center line average roughness (Ra) was larger than 0.6 μm, the sealing performance was poor. Therefore, the center line average roughness (Ra) of the sliding surface 2a was preferably 0.3 to 0.6 μm.
【００３０】また、摺接面２ａの平均結晶粒子径を変化
させて同様の試験を行ったところ、平均結晶粒子径は８
〜２５μｍの範囲が良いことが確認された。[0030] When similar tests were conducted by changing the average crystal grain size of the sliding surface 2a, the average crystal grain size was 8.
It was confirmed that the range of ~25 μm is good.
【００３１】[0031]
【表４】[Table 4]
【００３２】[0032]
【発明の効果】このように本発明によれば、セラミック
ディスクバルブにおいて、２枚の弁体のうち一方の摺接
面を中心線平均粗さ（Ｒａ）０．２μｍ以下の滑らかな
面とし、他方の摺接面を中心線平均粗さ（Ｒａ）０．３
〜０．６μｍとし、結晶曲率半径２μｍ以上としたこと
によって、潤滑剤を用いることなく、長期間にわたって
、高シール性を保ったまま、小さな操作トルクを維持で
きる。したがって、前記したディスクバルブの要求特性
をすべて満たすことができ、湯水混合栓用フォーセット
などに好適に用いることができる。As described above, according to the present invention, in a ceramic disc valve, the sliding surface of one of the two valve bodies is a smooth surface with a center line average roughness (Ra) of 0.2 μm or less, Center line average roughness (Ra) of the other sliding surface is 0.3.
By setting the crystal curvature radius to 0.6 μm and 2 μm or more, a small operating torque can be maintained over a long period of time without using a lubricant while maintaining high sealing performance. Therefore, all of the above-described required characteristics of the disc valve can be satisfied, and it can be suitably used for faucets for hot and cold water mixing faucets.
【図１】セラミックディスクバルブの構造を示す断面図
である。FIG. 1 is a sectional view showing the structure of a ceramic disc valve.
【図２】図１中のＡ部の拡大断面図である。FIG. 2 is an enlarged sectional view of section A in FIG. 1;
【図３】図２に相当する、比較例の拡大断面図である。FIG. 3 is an enlarged sectional view of a comparative example corresponding to FIG. 2;
【図４】本発明および比較例のディスクバルブにおける
、サイクル数と操作トルクの関係を示すグラフである。FIG. 4 is a graph showing the relationship between the number of cycles and operating torque in disc valves of the present invention and comparative examples.
１ ・・・可動弁体 １ａ・・・摺接面 ２ ・・・固定弁体 ２ａ・・・摺接面 ３ ・・・レバー 1...Movable valve body 1a...Sliding surface 2...Fixed valve body 2a...Sliding surface 3...Lever
Claims (1)
を摺接させて流路の開通、遮断を行うようにしたディス
クバルブにおいて、一方の弁体の摺接面を中心線平均粗
さ（Ｒａ）０．２μｍ以下の滑らかな面とし、他方の弁
体の摺接面を中心線平均粗さ（Ｒａ）０．３〜０．６μ
ｍ、結晶曲率半径２μｍ以上としたことを特徴とするセ
ラミックディスクバルブ。[Claim 1] In a disc valve in which two valve bodies made of ceramic plate-like bodies are brought into sliding contact to open and close a flow path, the sliding surface of one valve body has a centerline average roughness. The sliding surface of the other valve body should have a center line average roughness (Ra) of 0.3 to 0.6 μm.
A ceramic disc valve characterized in that the radius of crystal curvature is 2 μm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3127745A JP2979530B2 (en) | 1991-05-30 | 1991-05-30 | Ceramic disc valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3127745A JP2979530B2 (en) | 1991-05-30 | 1991-05-30 | Ceramic disc valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04351379A true JPH04351379A (en) | 1992-12-07 |
| JP2979530B2 JP2979530B2 (en) | 1999-11-15 |
Family
ID=14967641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3127745A Expired - Lifetime JP2979530B2 (en) | 1991-05-30 | 1991-05-30 | Ceramic disc valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2979530B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009236179A (en) * | 2008-03-26 | 2009-10-15 | Kyocera Corp | Flow passage regulation member and liquid discharge device |
| JP2013227989A (en) * | 2012-04-24 | 2013-11-07 | Fuji Koki Corp | Four-way switching valve |
-
1991
- 1991-05-30 JP JP3127745A patent/JP2979530B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009236179A (en) * | 2008-03-26 | 2009-10-15 | Kyocera Corp | Flow passage regulation member and liquid discharge device |
| JP2013227989A (en) * | 2012-04-24 | 2013-11-07 | Fuji Koki Corp | Four-way switching valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2979530B2 (en) | 1999-11-15 |
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